JPH01190836A - Device for grading road surface - Google Patents

Abstract

PURPOSE:To make it possible to maintain a working blade at a level at all time by letting the front and rear sections of a supporting main body supporting the working blade be supported by a front and a rear supporting body respectively in such a way as to be freely turned on its longitudinal axis. CONSTITUTION:One end section of a front supporting body 96 is connected with the front section of a supporting main body 4 supporting a working blade 6, and the other end section thereof is connected with a vehicle in such a way as to be freely turned. And the both end sections in the lateral direction of the one end section of a rear supporting body 98 are connected with the both rear end sections of the supporting main body 4 in such a way as to be freely turned, and the both end sections in the lateral direction of the other end section thereof are connected with a member mounted on the vehicle on its axial line extending in the longitudinal direction of the vehicle in such a way as to be freely turned. This constitution allows the supporting body 4 to be freely turned in a specified range relatively against the vehicle on its axial line extending in the longitudinal direction, thereby making it possible to maintain the supporting body at a level regardless of the tilt of the vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a road shaping device that is installed on an earthmoving vehicle.

<Prior Art> Earthmoving vehicles equipped with working blades have been widely used to shape road surfaces or remove snow from road surfaces.

However, conventional earthmoving vehicles of this type are not fully satisfactory and have the following problems that need to be resolved.

For example, a motor grader equipped with a working blade has a long overall vehicle length and a large turning radius, making it difficult to work on relatively narrow roads or roads with many turns. Also, during shaping work with a work blade,
Since the working blade is arranged obliquely to the direction of movement of the vehicle body, a thrust load acts on the vehicle body through this working blade, causing the vehicle body to slip laterally during work. There is a risk of

In addition, for example, in a wheel loader equipped with a working blade, the working blade is attached to the front end of the earthmoving vehicle and placed in front of the front wheels, so it is not possible to obtain a large penetration force, especially for snow compaction and ice burns. It is difficult to remove hard gravel and to shape hard gravel. Furthermore, due to the above-mentioned factors, pitching of the front and rear wheels is likely to occur during work, and when such pitching occurs, it is difficult to shape the road surface uniformly and flatly. In particular, when the working blade is placed in front of the front wheel, the pitching causes the blade to move up and down relatively significantly.
It becomes even more difficult to level the road surface.

<Object of the Invention> The present invention has been made in view of the above facts, and its main purpose is to provide an excellent road surface shaping device that can substantially level the road surface regardless of its unevenness. It is.

Another object of the present invention is to provide an excellent road shaping device that can secure sufficient ground clearance when not working and can also reliably prevent interference between blade members when storing the blades. It is to be.

Still another object of the present invention is to provide an excellent road shaping device that can be widely applied to various working conditions.

Other objects of the invention will be understood from the following description.

<Summary of the Invention> According to one aspect of the present invention, a road surface shaping device installed on an earthmoving vehicle includes a support body, a front support body for supporting a front portion of the support body, and a front support body for supporting a front portion of the support body. A rear support body for supporting the rear part, a working blade attached to the support body, and a lifting hydraulic cylinder mechanism for raising and lowering the support body, one end of the front support body. is pivotally connected to a substantially central portion in the lateral direction of the front portion of the support body, the other end is pivotally connected to the earthmoving vehicle, and both lateral ends at one end of the rear support are respectively pivotally connected to both rear ends of the support body, and both lateral ends of the other ends are connected relative to the vehicle body about an axis extending in the longitudinal direction of the earthmoving vehicle in the core construction vehicle. a road surface shaping device, which is rotatably connected to a member that is rotatably mounted on the road surface shaping device, and the lifting hydraulic cylinder mechanism is interposed between the support body and the earthmoving vehicle. is provided.

In such a road surface shaping device, the supporting body can freely rotate over a predetermined range about an axis that extends in the front-rear direction relative to the earth-moving vehicle, so that the earth-moving vehicle cannot run over a protrusion such as the ground. Even when tilted, the support body continues to remain substantially horizontal.

According to another aspect of the present invention, in addition to the features described above, at least one of the two lateral ends of one end of the rear support is provided with a length adjustable means. A road shaping device is provided that is coupled to a support body.

In such a road shaping device, by adjusting the length of the length-adjustable means, the vertical position of the rear part of the support body can be adjusted as required, and thus various working conditions can be adequately coped with. I can do something.

According to still another aspect of the present invention, there is provided a road shaping device installed in an earthmoving vehicle, including a support body and a pair of support bodies each attached to the support body so as to be rotatable between an operating position and a storage position. It is equipped with a working blade composed of a blade member and a support mechanism for connecting the support body to the earthmoving vehicle, and when the working blade is in a stored state, one of the pair of blade members After the other of the blade members is placed in the storage position, the other of the blade members is pivoted toward the storage position, and when the blade member is brought into the working position, the other of the blade members is placed in the working position, and then the other of the blade members is rotated toward the storage position. A road shaping device is provided, characterized in that one side is configured to be pivoted toward the operating position.

In such a road surface shaping device, the working blade can be stored as required by placing the pair of blade members in the storage position, and furthermore, when placing the pair of blade members in the storage position, after one blade member is stored, the other blade member is When the blade members are stored and placed in the operating state, one blade member becomes the operating state after the other blade member becomes the operating state, and therefore, mutual interference occurs when the pair of blade members rotate. Never.

<Specific Example of the Invention> Hereinafter, a specific example of the road shaping device according to the present invention will be described with reference to the accompanying drawings.

In FIGS. 1 to 3, the illustrated road surface shaping device, which is designated by the number 2 as a whole, includes a support body 4, a working blade 6 attached to the support body 4, and a support body 4 that is connected to an earth-moving vehicle (described later). It is equipped with a support mechanism 8 for connecting to.

Mainly referring to FIG. 2, the illustrated support body 4 has a substantially triangular shape, and extends from the center to the right in the lateral direction (in the direction perpendicular to the plane of the paper in FIG. 1, in the left-right direction in FIGS. 2 and 3). a right front frame 10 that extends rearwardly toward the left, a left front frame 12 that extends rearwardly from the center in the width direction, and a right front frame 10 and a left front frame 1.
It has a rear frame 14 arranged at the rear of 2. One end, ie, the right end, of the right front frame 10 and the rear frame 14 are connected by an auxiliary frame 16, and the other end, ie, the left end, of the left front frame 12 and the rear frame 14 are connected by an auxiliary frame 18. Furthermore, a connecting portion between the right front frame 10 and the left front frame 12 and a laterally substantially central portion of the rear frame 14 are connected by a central frame 15.

The illustrated working blade 6 is composed of a pair of blade members composed of ice burn peeling blades, namely a right blade member 20 and a left blade member 22 (
Note that a normal soil removal blade can be used as the ice burn peeling blade). Referring also to FIG. 3, the right blade member 20 is connected to the right front frame 10 of the support body 4.
is rotatably attached to the front end of the left blade member 22.
is rotatably attached to the front end of the left front frame 12 of the support body 4. These right blade member 20 and left blade member 22 are in the operating position shown in FIGS. 2 and 3 and in the first and second positions.
Storage position shown in the figure (right blade member 20 in Figure 1)
(only shown). The right blade member 20 and the left blade member 22 are provided with cutting edges 24 and 26 at their lower ends for removing ice burns. The cutting edges 24 and 26, which are made up of elongated plate-like members, have serrated lower ends, and are attached to the right blade member 2 by a plurality of attachment ports 28.
0 and the left blade member 22. Furthermore, auxiliary blade members 30 and 32 whose front surfaces are curved concavely and extend upward are attached to the outer ends of the right blade member 20 and the left blade member 22. With this structure, as shown in FIGS. 2 and 3, the right blade member 20 and the left blade member 22 extend from the substantially central portion in the width direction toward both sides of the front end of the support body 4 toward the earthmoving vehicle (
(described later) in the front-rear direction (left-right direction in Fig. 1,
The front surfaces of the right blade member 20 and the left blade member 22 are substantially continuous in the operating state shown in FIGS. 2 and 3. A 7-shaped working surface is defined.

The cutting edges 24 and 26 also extend substantially over the entire lower end of the right blade member 20 and the left blade member 22, defining a substantially continuous cutting edge over substantially the entire width of the working blade 6. As will be understood from the description below, when the working blade 6 (the right blade member 20 and the left blade member 22) is composed of the ice burn peeling blade shown in the figure, the road surface shaping device 2 can be used for compacting snow on the road. It can be conveniently used for removing ice burns or removing ice burns. On the other hand, the working blade 6 is replaced with the ice burn removal blade described above, and the soil removal blade (for example, the lower end is replaced with the ice burn removal cutting edges 26 and 28 attached to the right blade member 20 and the left blade member 22). By attaching a normal plate-shaped cutting edge with a straight edge, it can be used as an earth removal blade. It can be conveniently used for road surface shaping work, general land leveling work, etc.

In the specific example, the right blade member 20 and the left blade member 22 are detachably attached to the support body 4 as follows. The mounting style of the right blade member 20 and the left blade member 22 is substantially the same, therefore, the fourth
The manner in which the right blade member 20 is attached will be described with reference to FIGS. 6 to 6. A pair of support means 40a and 40b are provided at both ends of the right front frame 10 of the support body 4. One of the supporting means 40a is composed of a block piece 42a fixed to the connecting part of the right front frame 10, the left front frame 12, and the center frame 15, and the other supporting means 40
b consists of a support bracket 42b disposed at the outer end of the right front frame 10, and this support bracket 42b
is the mounting bolt 44 at the outer end (right end) of the right front frame 10.
It is removably attached. A circular recess 45 is formed on one side of the block piece 42a (although not shown, a recess for the left blade member 22 is formed on the other side). In addition, the support bracket 4
A circular through hole is formed in 2b, and a sleeve-shaped bearing member 46 is mounted in the through hole. Further, on the front surface of the right front frame 10, a plurality of (six in the specific example) receiving members 48 are provided at intervals in the longitudinal direction of the right front frame 10.
are fixed, and a substantially semicircular receiving portion (FIG. 1) is defined on the front surface of these receiving members 48.

On the other hand, on the back surface of the right blade member 20, a plurality of (six in the specific example) brackets 5 are arranged at intervals in the longitudinal direction.
0 is fixed, and a right support shaft 54 is fixed passing through these brackets 50.

One end of the right support shaft 54 projects further inwardly through the bracket 50 present at the inner end of the right blade member 20, and the other end of the right support shaft 54 extends through the bracket 50 located at the inner end of the right blade member 20.
It also projects somewhat outwardly through a bracket 50 which is present at the outer end of the 0.

In the specific example, the third specific bracket 50 from the outside provided on the right blade member 20 is somewhat larger than the other brackets 50 and protrudes upward, so that the hydraulic cylinder mechanism for storage, which will be described later, It is connected to the third such specific bracket 50 from the outside.

With this structure, as understood from FIGS. 2 and 6, the right blade member 20 (or left blade member 2
2), the right support shaft 54 (or left support shaft 56) extending in the longitudinal direction on the back surface of the right blade member 20 (or left blade member 22) is attached to the right support shaft 54 (or left support shaft 56) on the right front frame 10 (or left front frame 12). It is removably received in a receiving portion defined in member 48. Next, one end of the right support shaft 54 (or left support shaft 56) is inserted into the recess 45 defined on one side (or the other side) of the block piece 42a. After that, the support bracket 42b is attached to the other end of the right support shaft 54 (or the left support shaft 56), and this support bracket 42b is
Attach the right front frame 10 of the support body 4 with the mounting screws 44.
(Front left frame 12). Thus, the right blade member 20 (or left blade member 22) is connected to the block piece 4.
2a and the support bracket 42b so as to be rotatable around the right support shaft 54 (or left support shaft 56).

Therefore, the right blade member 20 (or the left blade member 22
) is transmitted to the support body 4 via the block piece 42a, the support bracket 42b, and the receiving member 48.

On the other hand, the right blade member 20 (or left blade member 22)
To remove the support bracket 42b, loosen the mounting screw 44 and remove the support bracket 42b, contrary to the mounting operation described above, and then remove the right blade member 20 (or the left blade member 22
) and the right support shaft 54 (or left support shaft 56) are moved outward. In this way, the right support shaft 54 (or the left support shaft 5
6) is removed from the block piece 42a. Thereafter, the right blade member 20 (or left blade member 22) and right support shaft 54 (or left support shaft 56) are moved somewhat forward. When moved in this way, the right support shaft 54 (or left support shaft 5
6) is detached from the receiving part defined in the receiving member 48, and the right blade member 20 (or left blade member 22)
He will be withdrawn from 4.

Incidentally, as will be understood from the description later, the right blade member 20
(or the left blade member 22), it is necessary to connect the hydraulic cylinder machine II for storage (described later) and the specific bracket 50 as required, while the cloth blade member 20 (or the left blade member 22), it is necessary to disconnect the specific bracket 50 from the housing fluid pressure cylinder body structure (described later).

As described above, in the specific example, the right blade member 20
The left blade member 22 can be easily attached to and detached from the support body 4, and therefore, the cutting edges 24 and 26 can be easily replaced due to wear or changes in work contents.

The right blade member 20 and the left blade member 22 are respectively provided with storage hydraulic cylinder mechanisms 58a and 58b, which may be comprised of, for example, a hydraulic cylinder a#f. Referring to FIGS. 2, 4, and 5, one housing fluid pressure cylinder mechanism 58a is disposed at the right end of the support body 4, and its cylinder body 60 is connected to the rear frame 14 and the auxiliary frame. The output rod 64 is pivotally connected to the bracket means 62 provided at the connecting portion of the blade 16 through a pin member, and the output rod 64 is pivotally connected to the specific bracket 50 fixed to the right blade member 20 through a connecting pin 66. freely connected. The connecting pin 66 is relatively long, and one end thereof is located at the outer end of the right front frame 10, and the large diameter portion 66a of the other end is located passing through the output rod 64 and the specific bracket 50, and the connecting pin 66 is located at the outer end of the right front frame 10. One end of the pin 66 is attached to a bracket 69 fixed to the right blade member 20 by a fixing screw 68. The other storage fluid pressure cylinder m1m58b is disposed at the left end of the support body 4, and its cylinder body 70 is attached to the rear frame 14.
The connecting pin 76 is rotatably connected to the bracket means 72 provided at the connecting portion of the auxiliary frame 18 via a pin member, and the output rod 74 of the mana is connected to the specific bracket 50 fixed to the left blade member 22. They are rotatably connected via the The connecting pin 76 also extends relatively long,
One end thereof is located at the outer end of the left front frame 12, and the large diameter part of the other end is located passing through the output lot 74 and a specific bracket 50, and one end of the connecting pin 76 is secured by a fixing screw 78. It is attached to a bracket 79 fixed to the left blade member 22. As described above, when the storage hydraulic cylinder mechanisms 58a and 58b are extended (or retracted a), the right blade member 20
and the left blade member 22 are centered on the right support shaft 54 and the left support shaft 56, respectively, as indicated by the arrow 80 (or 82) in FIG.
It is rotated downward (or upward) as shown in FIG. )
be forced to

Further, as is easily understood, the cutting angles of the right blade member 20 and the left blade member 22 can be adjusted by adjusting the contracted state of the storage hydraulic cylinder mechanisms 58a and 58b.

Note that in order to connect the output lots 64 and 74 of the storage fluid pressure cylinder mechanisms 58a and 58b with the specific brackets 50 provided on the right blade member 20 and the left blade member 22, the output lots 64 and 74 and the corresponding Insert the connecting pins 66 and 76 through the specific bracket 50, and secure one end of each connecting pin 66 and 76 with the fixing screw 6.
8 and 78 to be screwed onto the right blade member 20 and the left blade member 22. On the other hand, in order to disconnect the output lots 64 and 74 of the storage hydraulic cylinder mechanisms 58a and 58b from the specific brackets 50 provided on the right blade member 20 and the left blade member 22, After removing the fixing screws 68 and 78 from the right blade member 20 and left blade member 22, the connecting pins 66 and 76 may be pulled out to the outside. In the specific example, the connecting pins 66 and 76 are elongated and one end thereof is located at the outer end of the front right frame 10 and the front left frame 12, and therefore, the attachment and detachment of the connecting pins 66 and 76 can be easily carried out by earthworks. This can be easily done from the side of the vehicle (described later).

The support body 4 with the working blade 6 is mounted as required via a support mechanism 8 on the underside of an earthmoving vehicle, preferably a wheel loader. Mainly referring to Figure 1,
A vehicle body 80 in an earthmoving vehicle such as a wheel loader is a vehicle front section (only a part of the front frame 84 of which is shown in FIG. 1) to which a pair of front wheels 82 (only one is shown in FIG. 1) are mounted as required. ) and a pair of rear wheels 86 (
2 and 3) are installed as required 88
(shown by the two-dot chain line in FIG. 7, and only a part of the rear frame 90 is shown in FIGS. 1 to 3), and the rear end of the front frame 84 and the rear frame 92. The front end portions are connected so as to be pivotable about a pivot axis 94 that extends in the vertical direction. In a specific example, the support body 4 is installed in the rear part 88 of the vehicle as follows.

Referring further to FIG. 2 in conjunction with FIG. 1, the illustrated support mechanism 8 includes a front support 96 and a rear support 98. The front support body 96 is composed of a rod-shaped link member 102, and the link member 102 is located approximately at the center of the vehicle body 80 in the lateral direction (in the direction perpendicular to the plane of the paper in FIG. 1, in the left-right direction in FIGS. 2 and 3). part, preferably substantially in the middle, and one end, i.e. the lower end, of the supporting body 4
The other end, that is, the upper end, is connected to the vehicle rear part 88 of the vehicle main body 80. In the illustrated example,
The link member 102 is curved somewhat in an angular shape, and one end of the link member 102 is connected to a bracket means 108 provided at the front end of the central frame 15, in the laterally substantially central part of the front part of the support body 4. It is rotatably connected via a pin member, and the other end is connected via a pin member to a bracket means 112 provided substantially at the center in the longitudinal direction of a cross member 110 connected between both sides of the rear frame 90. They are connected so that they can rotate freely. Further, the rear support body 98 includes four plate members 104a, 104 arranged at intervals.
b, 106a and 106b, and these plate members 104a, 104b.

106a and 106b are main plates 113a and 113
b and auxiliary plates 115a and 115b. After this, one end of the support body 98, that is, the first
The right end in the figure is connected to the rear part of the support body 4, and the other end, that is, the left end in FIG. 1, is connected to the vehicle rear part 88 of the vehicle body 80. Hydraulic cylinder machines a 114 a and 114 b, which can be constructed from a hydraulic cylinder mechanism, are interposed. More specifically, plate members 104a and 10
One fluid pressure cylinder mechanism 114a is installed at one end between 4b and 4b.
The output rod 117a of the hydraulic cylinder mechanism 114a is rotatably connected to a bracket means 118 provided at the right end of the rear frame 14 of the support body 4 via a pin member. Further, a bracket means 119 is integrally provided at the other end portions of the plate members 104a and 104b, and the bracket means 119 is provided at one end portion of the axle housing 116 in the rear portion 88 of the vehicle, that is, at the lower right end portion. 120 via a pin member so as to be rotatable. Further, the other fluid pressure cylinder mechanism 114b is attached to one end between the plate members 106a and 106b, and the output rod 117b of the other fluid pressure cylinder mechanism 114b is attached to a bracket means 121 provided at the left end of the rear frame 14. is rotatably connected to via a pin member. Further, a bracket means 122 is integrally provided at the other end portions of the plate members 106a and 106b, and the bracket means 122 is pinned to a bracket means 123 provided at the other end portion of the axle housing 116, that is, at the lower left end portion. They are rotatably connected via a member. In an earthmoving vehicle such as a wheel loader, a well-known oscillation mechanism is employed in connection with the rear wheels 86, and the axle housing 116 is vertically pivotable. That is,
Referring to FIGS. 2 and 7, between the right and left parts of the rear frame 90 of the vehicle rear part 88, both ends of a pair of trunnion supports 124 and 126 are connected to bolts 128 at intervals in the longitudinal direction. The axle housing 116 is attached to the center of the axle housing 116 by a nut 130, and is rotatably mounted between the pair of trunnion supports 124 and 126 about an axis 132 (Fig. The part is attached so that it can rotate freely. As shown above, the axle housing 11 of the specific example
As shown in FIG. 7, 6 is a predetermined angle range (for example, ±10 degrees) centered on the axis 132, that is, the right maximum inclination angle position indicated by the two-dot chain line 116A and the left maximum inclination angle position indicated by the two-dot chain line 116B. 88 relative to the vehicle rear part 88, the desired effect described below in this connection is achieved. As will be easily understood from the description below, there is a shaft in the rear part 88 of the vehicle that is pivotable relative to the vehicle main body 80, substantially aligned with the axle of the rear wheel 86 about an axis extending in the longitudinal direction. A mounting member (not shown) for the rear support body 98 may be provided, and the other end of the rear support body 98 may be pivotally connected to the mounting member.

As the fluid pressure cylinder mechanism 114a (114b),
For example, a configuration as shown in FIG. 8 can be used. In FIG. 8, a cover member 134a (134b) constituting a part of the hydraulic cylinder mechanism 114a (114b) is fixed between one end of a pair of plate members 104a and 104b (106a and 106b). (See also Figure 2). This cover member 134a (1
34b) is a block 13 in which a cylindrical through hole is formed.
6 is attached by a plurality of bolts 137, and the cover member 134a (134b) and block 136 constitute a cylinder body in the fluid pressure cylinder mechanism 114a (114b). A cylindrical rod 138 is slidably received in the through hole of the block 136, and a rod assembly 140 having a connecting portion 139 is screwed to one end of the rod 138.
0 constitutes the output lot 117a (117b) in the fluid pressure cylinder body 114a (114b). Furthermore, the cover member 134a (134b) and the block 13
6 is provided with ports 141 and 143 for inflow and outflow of fluid such as pressure oil.

As can be seen from FIG. 8, when fluid is supplied through boat 141, output lot 117a (117b) expands, while when fluid is supplied through boat 143, output lot 117a (117b) contracts. When the fluid pressure cylinder mechanism 114a (114b) extends, the right end (left end) of the axle housing 116, that is, the right end (left end) of the bracket means 120 (123) and the support body 4
That is, the distance between the bracket means 118 (121>) becomes wider, and the rear right end (left end) of the support body 4 is moved downward, whereas the hydraulic cylinder mechanism 1
When 14a (114b) contracts, the distance between the right end (left end) of the axle housing 116 and the right end (left end) of the support body 4 becomes smaller, so that the rear right end (left end) of the support body 4 moves upward. The vertical position of the support body 4 can be adjusted by expanding and contracting the hydraulic cylinder mechanism 114a (114b) (see also FIG. 2).

In addition, as a length adjustable means for changing the distance between the axle housing 116 and the support body 4, a fluid pressure cylinder mechanism 114a (114b) shown in FIG. 8 is used.
Instead, the mechanism shown in FIG. 9 may be used, and in such a case, the length adjustment will be performed manually. The adjustment mechanism 142 shown in FIG. 9 includes a block 144 in which a cylindrical through hole is formed.
(134b). One end of a shaft portion 150 of a rod assembly 148 is slidably received in the through hole of the block 144, and a connecting portion 152 provided on the rod assembly 148 is connected to the bracket means 118 of the support body 4 via a pin member. (121> is rotatably connected. Also,
A screw shaft 154 is rotatably attached to the block 144 (an annular recess 154 formed in the through hole of the block 144).
is rotatably mounted by positioning an annular flange portion 158 provided on the threaded shaft 154), and is threaded onto one end of the threaded shaft 154 or one end of the shaft portion 150 of the rod assembly 148, and the like. The end is a cover member 1
34a (134b) and protrudes outward. Therefore, by attaching an appropriate tool (not shown) to the other end of the screw shaft 154, the screw shaft 154 can be easily rotated, and thus can be rotated in a predetermined direction (or in a direction opposite to the predetermined direction). By tightening the rod assembly 150, the rod assembly 150 can be expanded (or retracted).

Referring again to FIGS. 1 and 2, a lifting hydraulic cylinder mechanism 160 for raising and lowering the support body 4 is interposed between the support body 4 and the vehicle rear portion 90 of the vehicle body 80. There is. For example, a lifting hydraulic cylinder machine [160 is a vehicle main body 8
0, preferably at substantially the center in the lateral direction.

In a specific example, a protrusion 14a that protrudes rearward is provided at the longitudinal center of the rear frame 14 of the support body 4, and a bracket means 162 provided on the protrusion 14a is attached to a hydraulic cylinder. 160 output lots 16
4 are rotatably connected via a pin member. Further, a connecting member 166 is disposed between a required portion of the rear frame 90 of the vehicle rear portion 88 (specifically, a portion further rear than the rear trunnion support 126), and the connecting member A cylinder body 170 of the hydraulic cylinder mechanism 160 is rotatably connected to a bracket means 168 provided at the longitudinal center of the cylinder 166 via a pin member. Therefore, as shown in FIG. 1, when the hydraulic cylinder mechanism 160 contracts (or expands), the support body 4 partially lowers (or lowers) to the lowest position shown by the two-dot chain line (or the highest position shown by the solid line). or rise).

The illustrated road surface shaping device 2 is provided with support fi! as described above.
118 below the vehicle body 80 as shown in FIGS. It extends substantially symmetrically, slanting rearward from the top to both sides (Fig. 2). Therefore, the loads acting on the working blade 6 during various operations are substantially symmetrical with respect to the lateral center, and the tendency of the earthmoving vehicle to tilt is effectively eliminated.

Further, the working blade 6 (that is, the right blade member 20 and the left blade member 22) is connected to the front wheel 82 and the rear wheel of the vehicle body 80.
a86, preferably located below near the center of gravity of the vehicle body 80 in the longitudinal direction as in the specific example.
Figure 1). Therefore, substantially the entire weight of the vehicle body 80 can be applied to the working blade 6 as a penetrating force, and thereby a large penetrating force and cutting force can be obtained. Furthermore, since the working blade 6 is arranged as described above, pitching of the front wheels 82 and rear wheels 86 is less likely to occur, and even if pitching occurs, the effect on the working blade 6 is small.

Further, the support m ellipse 8, that is, the front support 96 and the rear support 98
substantially constitutes a parallel link s#I (Fig. 1),
Therefore, the support body 4, and thus the working blade 6, are held substantially horizontally by the expansion and contraction of the hydraulic cylinder machine $160, and the hydraulic cylinder IM for adjusting the vertical movement is held substantially horizontally. 41
Il14a and 114b and lifting hydraulic cylinder m
The operation of the structure 160 is controlled by a fluid pressure control system shown in FIG.

The illustrated fluid pressure control system includes a pressure oil source 172 such as a hydraulic pump operated by an internal combustion engine of an earthmoving vehicle, a fluid reservoir 174 such as a tank, a first switching control valve 176, a second switching control valve 178, A third switching control valve 180 and a fourth switching control valve 182 are provided. First switching control valve 17
6 is selectively positioned in a neutral position, a first working position, and a second working position, and when in the neutral position, the flow path 184
and the flow #1186, or when set to the first action position, the flow path 188 branching from the flow path 184 and the flow path 190 are communicated, and the flow path 192 and the flow path 194 are communicated, while the second action When in this position, the flow path 88 and the flow path 1i192 are communicated with each other, and the flow path 190 and the flow path 194 are communicated with each other. Channel 1
90 is connected to the rod side (contraction side) of the fluid pressure cylinder mechanism 160 via a throttle 196 and a check valve 198, and the flow path 192 is connected to the cylinder of the fluid pressure cylinder mechanism 160 via a throttle 200 and a check valve 202. connected to the side (extension side). Restrictions 196 and 20 in channels 190 and 192
0 and pilot operated check valves 198 and 202
These fluid pressure cylinder mechanisms 1
Acting as a locking means 204 for holding 60,
Therefore, as will be described later, even if a large load is applied to the hydraulic cylinder mechanism 160, the hydraulic cylinder mechanism 160 will not substantially expand or contract, and the hydraulic cylinder mechanism 160 can be reliably held in a predetermined position. 4, thus holding the working blade 66 in place).

The second switching control valve 178 is selectively positioned at a neutral position, a first operating position, and a second operating position, and communicates the flow path 186 and the flow path 206 when in the neutral position, but when the second switching control valve 178 is in the neutral position, the flow path 186 and the flow path 206 are communicated. When the position is set, the passage 188 and the passage 208 are communicated with each other, and the passage 210 is connected to the passage 212 connected to the passage 194, while when it is placed in the second working position, the passage 188 and the passage 210 are connected. At the same time, the flow path 208 and the flow path 212 are communicated with each other. The flow path 208 is a flow path 208a and a flow path 2.
08b, one flow path 208a is connected to the cylinder side of the fluid pressure cylinder mechanism 58a, and the other flow path 208b is a first flow path consisting of a throttle 214 and a check valve 216 arranged in parallel with each other. The hydraulic cylinder mechanism 58b is connected to the cylinder side of the hydraulic cylinder mechanism 58b via an operation priority means 218. Therefore, when pressure fluid is supplied to the flow path 208 as described later, the pressure fluid passes through the flow path 208a and first flows to the cylinder side of the fluid pressure cylinder a structure 58a because the throttle 214 in the flow N208b acts as a resistance. is then fed to the cylinder side of the other hydraulic cylinder mechanism 58b through the flow path 208b, and thus, by the action of the first actuation priority means 218, after the hydraulic cylinder mechanism 58a is extended, the other hydraulic cylinder mechanism 58a is extended. The hydraulic cylinder mechanism 58b becomes extended. Further, the flow path 210 is also the flow path 210a.
and a flow path 210b, one flow path 210a is connected to the rod of the fluid pressure cylinder mechanism 58a via a second operation priority means 224 consisting of a throttle 220 and a check valve 222 arranged in parallel. The other flow path 210b is connected to the rod side of the fluid pressure cylinder mechanism 58b. Therefore, when pressure fluid is supplied to the flow path 210, the throttle 220 in the flow path 210a
acts as a resistance, the pressure fluid is first fed to the rod side of the other fluid pressure cylinder mechanism 58b through the flow path 210b, and then through the flow path 210a to the rod side of the one fluid pressure cylinder mechanism 58a. Thus, by the action of the second operation priority means 224, one of the hydraulic cylinders ai58a is contracted after the other hydraulic cylinder mechanism 58b is contracted.

The third switching control valve 180 and the fourth switching control valve 182 are also selectively positioned in a neutral position, a first working position, and a second working position, respectively. When the third switching control valve 180 is in the neutral position, the flow path 206 and the flow path 226 are connected to each other.
When the flow path 188 and the flow path 228 are in communication with each other and the flow path 228 is in the first operating position, the flow path 228 and the flow path 212 are communicated with each other.
On the other hand, when set to the second operating position, the flow path 188 and the flow path 230 are communicated, and the flow path 228 and the flow path 212 are communicated with each other. The flow path 228 is connected to the rod side (boat 143 in FIG. 8) of the fluid pressure cylinder mechanism 114b, and the flow path 230 is connected to the cylinder side (boat 141 in FIG. 8) of the fluid pressure cylinder mechanism 114b. . Furthermore, the fourth switching control valve 182 communicates the flow path 226 with the flow path 212 when in the neutral position, and communicates the flow path 188 with the flow path 232 when in the first operating position. 234 communicates with the flow path 212, while in the second working position, the flow path 188 and the flow path 234 communicate with each other, and the flow path 232 and the flow path 212 communicate with each other.

The flow path 232 is connected to the rod side (
The flow path 234 is connected to the cylinder side (bow) 141) of the hydraulic cylinder mechanism 114a. Furthermore, a relief valve 236 is connected between the flow path 184 and the flow path 194. This relief valve 2
36 serves to maintain the pressure of fluid delivered through channels 184 and 188 at a predetermined value.

The illustrated fluid pressure control system further includes damping means for damping the impact acting on the right blade member 20 and the left blade member 22. The buffering means in the specific example is composed of a relief valve 238, and the relief valve 238 is connected to the flow path 210a. Therefore, as shown by the solid (or broken) arrow, the right blade member 20 (or left blade member 22)
When an impact force is applied to the lower end of the hydraulic cylinder mechanism 58a (or 58b), the pressure fluid on the rod side of the hydraulic cylinder mechanism 58a (or 58b) is compressed. Then, when the pressure of the pressure fluid exceeds the set value, the relief valve 238 becomes open,
The fluid pressure cylinder mechanism 58a (
Alternatively, the pressure fluid on the rod side of 58b) is returned to the fluid reservoir 174, and thus, the flow of the pressure fluid through the relief valve 238 effectively buffers the impact and prevents damage to the hydraulic cylinder 1141158a (or 58b), etc. 1
It will be done.

In such a fluid pressure control system, when the second switching control valve 178 is placed in the first operating position, pressure fluid such as pressure oil from the fluid pressure source 172 flows through the flow paths 184, 188 and 208.
The pressure fluid on the rod side of the storage fluid pressure cylinder mechanisms 58a and 58b is supplied to the cylinder side of the storage fluid pressure cylinder mechanisms 58a and 58b through the flow path 21.
0, 212 and 194 and returned to fluid reservoir 174;
Hydraulic cylinder mechanisms 58a and 58b are extended. At this time, the first operation priority means 21 is provided in the flow path 208b.
8, the pressure fluid AI knee=44- is first fed to the fluid pressure cylinder mechanism 58a, and the right blade member 20 pivots downward as indicated by the arrow 80 about the right support shaft 54, and the above-mentioned Positioned in storage position. After that,
Pressure fluid is supplied to the hydraulic cylinder mechanism 58b, and the left blade member 22 pivots downward as indicated by an arrow 80 about the left support shaft 56 and is positioned at the storage position, and the right blade member 20 and the left blade member 22 Mutual interference during storage is reliably prevented. When the blade 6 is in the stored state, the right blade member 20 and the left blade member 22 are inverted, as shown in FIGS. 1 and 5, so that when the right blade member 20 and the left blade member 22 are stored, The height above the ground becomes higher, and collision of the right blade member 20 and the left blade member 22, and thus the working blade 6, with the ground or the like is avoided.

On the other hand, when the second switching control valve 178 is placed in the second operating position, the pressure fluid from the fluid pressure source 172 is transferred to the flow path 18.
4, 188, and 210 to the rod sides of the storage hydraulic cylinder mechanisms m58a and 58b, and the pressure fluid on the cylinder side of the storage hydraulic cylinder mechanisms 58a and 58b is supplied through the flow paths 208, 212, and 194. The storage fluid pressure cylinder mechanism 5 is returned to the fluid reservoir 174.
8a and 58b are deflated. At this time, since the second operation priority means 224 is disposed in the flow path 210a, the pressure fluid is first supplied to the fluid pressure cylinder mechanism 58b, contrary to the above-mentioned storage time, and the left blade member 22 is pivoted upward as indicated by arrow 82 about the left support shaft 56 and is positioned at the above operating position. Thereafter, pressure fluid is fed to the hydraulic cylinder mechanism 58a, and the right blade member 20 moves in the direction of arrow 82 about the right support shaft 54.
The right blade member 20 and the left blade member 22 are reliably prevented from interfering with each other when the right blade member 20 and the left blade member 22 are turned toward the operating position.

In the operating state of the blade 6, the right blade member 20
The left blade member 22 now stands approximately upright, and the cutting edges 24 and 26 come to act on the road surface S, etc., and thus the working blade 6 can be used to perform desired work such as ice burn removal work. Can be done.

In the operating state of the blade 6, the earthmoving vehicle is moved in the direction of arrow 240 (
When the earthmoving vehicle moves forward in the direction shown in FIG. 1), the working blade 6 acts on the road surface S as the earthmoving vehicle moves forward, and thus ice burn existing on the road surface S can be removed as required. During such shaping work, as can be understood from FIG. 1, the load acting on the working blade 6 is applied to the front support 96, the rear support 98, and the hydraulic cylinder I! Oval 160
The signal is transmitted to the rear portion 88 of the vehicle via.

When the first switching control valve 176 is placed in the first working position (or the second working position), pressure fluid from the fluid pressure source 172 flows through the flow paths 184, 188, and 190 (or 184,
188 and 192) to the rod side (or cylinder side) of the lifting hydraulic cylinder mechanism 190, and the pressure fluid on the cylinder side (or rod side) of this fluid pressure cylinder mechanism 190 is supplied through the flow paths 192 and 194 ( or 1
90 and 194) and return to the fluid reservoir 174, causing the hydraulic cylinder mechanism 190 to contract (or expand). The front support 96 and the rear support 98 are then pivoted clockwise (or counterclockwise) in FIG. 1, and the support body 4 is thus lowered (or raised) as desired. By changing the extension state of the lifting hydraulic cylinder mechanism 160, the support body 4 can be positioned at a predetermined position in the vertical direction. The above mentioned descent =
49 ~ (or rising), since the support body 4 and therefore the working blade 6 are moved substantially in parallel, the working blade 6
The cutting angle remains virtually unchanged.

When the third switching control valve 180 is placed in the first working position (or the second working position), the pressure fluid from the fluid pressure source 172 flows into the flow paths 184, 188 and 228 (or 184,
188 and 230) to the rod side (or cylinder side) of the adjusting fluid pressure cylinder mechanism 114b, and the pressure fluid on the cylinder side (or rod side) of the fluid pressure cylinder mechanism 114b is supplied to the flow paths 230, 212, and 194 (
or 228, 212 and 194) through the fluid reservoir 174.
, and the fluid pressure cylinder mechanism 114b is contracted (or expanded). In this way, the rear left end portion of the support body 4 is lifted slightly upward (or pushed downward), and the vertical position of the support body 4 can be adjusted. At this time, as is easily understood, the working blade 6 is tilted somewhat to the lower right (or upper right).

Further, the fourth switching control valve 182 is moved to the first operating position (
or the second active position), pressure fluid from the fluid pressure source 172 flows through the flow paths 184, 188, and 232 (or the first working position).
84, 188, and 234) to the rod side (or cylinder side) of the adjusting fluid pressure cylinder mechanism 144a, and the cylinder side (or the cylinder side) of the fluid pressure cylinder mechanism 114a.
or rod side) pressure fluid flows through channels 234, 212 and 1.
94 (or 232, 212, and 194) and is returned to the fluid reservoir 174, where the hydraulic cylinder mechanism 114a is retracted (or expanded). Thus, supporting book #4
The rear right end of the is lifted slightly upward (or pushed downward).
This allows the vertical position of the support body 4 to be adjusted. At this time, the working blade 6 is tilted somewhat to the lower left (or upper left).

Such road surface shaping device 2 further has the following noteworthy features. That is, the front support body 96 is connected to the rear part 88 of the vehicle, and the rear support body 98 is connected to an axle housing 116 that is rotatably mounted relative to the rear part 88 of the vehicle about a shaft 132 extending in the front-rear direction. Therefore, the support body 4, and therefore the working blade 6, are allowed to pivot in the vertical direction about the axis 132 relative to the vehicle rear part 88. Therefore, if one front wheel 82 of the vehicle body 80 (for example, the right front wheel shown in FIG. 88
) is tilted to the left (or right). At this time, the pair of rear wheels 86 are not riding on the protrusion (or recess),
Therefore, the vehicle body 80 is only turned to the left (or right) relative to the rear wheel 86 and the axle housing 116 held substantially horizontally between the pair of rear wheels 86, The support body 4 and thus the working blade 6 continue to be held substantially horizontally. In particular, since the rear wheel 86 is located behind the working blade 6, it runs on the road surface S that has been shaped by the action of the working blade 6, and therefore, the working blade 6 is more effectively leveled. Retained.

Note that if the other front wheel 52 rides on a protrusion (or recess), the vehicle body 80 is turned in the opposite direction to that described above. As described above, the working blade 6 is held substantially horizontally regardless of any protrusions present on the road surface S, and the road surface S can be substantially leveled.

In the specific example, the working blade 6 can be tilted, and therefore both ends of the front support 96, both lateral ends at the rear of the rear support 98, and the adjustment fluid pressure cylinder body. Output lot 11 of 114a and 114b
7a and 117b and lifting fluid pressure cylinder mechanism 16
It is preferable that the output lot 164 and the cylinder body 170 are connected to each other via a well-known ball joint (the one shown in FIG. 9 can be used as an example).

Although a specific example of a road surface shaping device configured according to the present invention has been described above, the present invention is not limited to this specific example, and various modifications and changes can be made without departing from the scope of the present invention. It is.

For example, in the illustrated embodiment, both lateral ends of rear support 98 are connected to adjusting fluid pressure cylinder bodies 114a and 11, respectively.
Although the hydraulic cylinder mechanism 54 is connected to both rear ends of the support body 4 via 4b, the desired effect can be obtained by using only one of the hydraulic cylinder mechanisms 54-114a and 114b.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a part of an earthmoving vehicle equipped with a specific example of a road shaping device constructed according to the present invention. FIG. 2 is a plan view of the road shaping device shown in FIG. 1. FIG. 3 is a front view of the road shaping device shown in FIG. 1. FIG. 4 is a plan view showing the right blade member of the road shaping device shown in FIG. 1 and its vicinity. FIG. 5 is a partial side view for explaining the movement of the right blade member of the road shaping device shown in FIG. 1. FIG. 6 is an exploded plan view showing the right blade member and its vicinity of the road shaping device shown in FIG. 1; FIG. 7 is a schematic diagram for explaining the movement of the axle housing in the vehicle body. FIG. 8 is a sectional view showing the adjusting fluid pressure cylinder mechanism of the road shaping device shown in FIG. 1. FIG. 9 is a sectional view showing an adjustment mechanism used in place of the fluid pressure cylinder mechanism of FIG. 8. FIG. 10 is a fluid pressure circuit diagram showing a fluid pressure control system of the road surface shaping device of FIG. 1. 2... Road shaping device 4... Support body 6... Working blade 8... Support mechanism 20... Right blade member 22... Left blade members 24 and 26... Cutting edge 54... ... Right support shaft 56 ... Left support shafts 58a and 58b ... Storage fluid pressure cylinder mechanism 80 ... Vehicle main body 82 ... Front wheel 84 ... Front frame 86 ... Rear wheel 90 ... ... Rear frame 96 ... Front support body 98 ... Rear supports 114a and 114b ... Adjustment fluid pressure cylinder mechanism 116 ... Axle housing 160 ... Lifting fluid pressure cylinder mechanism 204 ... Locking means 218...First operation priority means 224...Second operation priority means 238...Relief valve 56 -

Claims (1)

[Scope of Claims] 1. A road surface shaping device installed on an earthmoving vehicle, comprising: a support body; a front support body for supporting the front portion of the support body;
The front support includes a rear support for supporting the rear part of the support body, a working blade attached to the support body, and a lifting hydraulic cylinder mechanism for raising and lowering the support body. one end of the support body is pivotally connected to a laterally substantially central portion of the front portion of the support body, the other end is pivotally connected to the earthmoving vehicle; Both lateral ends are pivotably connected to both rear ends of the support body, and both lateral ends of the other end are connected to the vehicle body around an axis extending in the front-rear direction of the earth-moving vehicle. The earthmoving vehicle is rotatably connected to a member that is rotatably mounted relative to the support body, and the lifting hydraulic cylinder mechanism is interposed between the support body and the earthmoving vehicle. Road shaping equipment. 2. The road surface shaping device according to claim 1, wherein both lateral ends of the other end of the rear support are pivotally connected to both ends of an axle housing of the earthmoving vehicle. 3. At least one of the lateral ends of the one end of the rear support body is pivotally connected to the rear part of the support body through means whose length is adjustable. 2. The road surface shaping device according to 2. 4. Both lateral ends of the one end of the rear support body are respectively pivotable to the rear part of the support body via adjustment fluid pressure cylinder mechanisms for adjusting the vertical position of the support body. The road shaping device according to claim 3, wherein the road shaping device is connected to a road shaping device. 5. A road surface shaping device installed on an earthmoving vehicle, comprising a support body and a pair of blade members, each of which is equipped on the support body so as to be able to pivot freely between an operating position and a storage position; and a support mechanism for connecting the support body to the earthmoving vehicle, and when the working blade is placed in a stored state, one of the pair of blade members is placed in the stored position, and then the working blade is placed in the stored position. The other blade member is rotated toward the storage position, and when the blade member is to be brought into operation, the other of the pair of blade members is brought into the operation position, and then one of the blade members is rotated toward the operation position. A road surface shaping device configured as follows. 6. The support body has a substantially triangular shape, and one of the pair of blade members is rotatably attached to one side of the support body in the lateral direction, and the other blade member is attached to the other side of the support body in the lateral direction. A pair of storage fluid pressure cylinder mechanisms are interposed between the supporting body and each of the pair of blade members, and the pair of storage fluid pressure cylinder mechanisms include one storage hydraulic cylinder mechanism. A first actuation priority means is provided so that the other hydraulic cylinder for storage is expanded after the hydraulic cylinder mechanism is expanded, and the first hydraulic cylinder for storage is configured to be stored after the other hydraulic cylinder mechanism for storage is contracted. 6. The road surface shaping device according to claim 5, further comprising second operation priority means for contracting the hydraulic cylinder mechanism. 7. Road surface shaping according to any one of claims 1 to 6, wherein the lower end of the working blade is provided with an ice burn removal cutting edge having a serrated lower end over substantially the entire width thereof. Device. 8. The road surface according to any one of claims 1 to 7, wherein the earthmoving vehicle is a wheel loader, and the working blade is disposed below the vehicle body of the wheel loader and between the front wheels and the rear wheels. Shaping device.