JPH10167130A - Crawler type traveling device - Google Patents

Abstract

(57) Abstract: A continuous striking sound generated when a crawler belt is wound around a sprocket in a polygonal shape can be reduced over a long period of time. An elongated hole (26E) is provided in a skid block (26) constituting a crawler belt receiving member (24), and a mounting screw (27) is attached to an elongated hole (2).
The skid block 26 is mounted to the base block 25 from above and below by tightening the screw holes 25A of the base block 25 from 6E. Thereby, the mounting position of the skid block 26 can be adjusted so that the crawler belt sliding contact surface 26C can always be in sliding contact with the crawler belt 19, and the impact sound at the time of engagement between the crawler belt 19 and the sprocket 15 can be reduced over a long period of time. Can be. In addition, the skid block 26
The downward load acting on the mounting screw 27 acts as a tensile force on the mounting screw 27 in the axial direction, so that the mounting screw 27 can be prevented from being broken.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a track-type traveling device suitably used for a tracked vehicle such as a hydraulic shovel and a hydraulic crane.

[0002]

2. Description of the Related Art Construction machines such as hydraulic shovels and hydraulic cranes are usually equipped with crawler-type traveling devices for traveling on construction sites such as rough lands and muddy lands.

[0003] Such a crawler-type traveling device generally has side frames on the left and right sides of a center frame, and one side of the side frames in the front-rear direction is a sprocket-side bracket and the other side is an idler-side bracket. It comprises a frame, a sprocket provided on a sprocket-side bracket of a truck frame and an idler provided on an idler-side bracket, and a crawler belt wound between the sprocket and the idler. When the sprocket is driven to rotate, the crawler belt meshing with the sprocket becomes a sprocket,
The lower traveling body travels around the idler and each roller.

[0004] By the way, it is known that noise occurs when the crawler belt orbits between the sprocket and the idler when the undercarriage provided with the crawler-type traveling device travels. It can be roughly divided into continuous blow sounds. Here, the intermittent hitting sound is generated by the crawler hitting the sprocket intermittently due to the waving vibration generated between the upper roller and the sprocket when the crawler goes around, and the continuous hitting sound is When a crawler belt composed of a large number of links is wound around a sprocket so as to draw a polygonal shape, the links are caused to continuously mesh with the sprocket while moving up and down.

On the other hand, in order to reduce continuous striking sound caused by a crawler belt being wound around a sprocket in a polygonal shape, for example, Japanese Utility Model Laid-Open No. 50-133635 discloses a position between an upper roller and a sprocket. A crawler-type traveling device provided with a crawler belt receiving member for supporting the crawler belt from below is disclosed. According to this crawler belt type traveling device, the crawler belt is supported from below by the crawler belt receiving member, and the crawler belt is guided so as to be tangentially wound around the sprocket, so that the crawler belt moves up and down when it meshes with the sprocket. Can be suppressed, and the continuous hitting sound when the crawler belt meshes with the sprocket can be reduced.

[0006]

However, since the sliding plate constituting the crawler belt receiving member according to the prior art described above is configured to be mounted at a fixed position with respect to the sprocket, it is always provided on the lower surface of the crawler belt that is driven to rotate. The sliding contact causes relatively early wear, and there is a problem that continuous hitting sound when the crawler belt is wound around the sprocket cannot be reduced over a long period of time.

The above-mentioned crawler belt receiving member has a support member erected on the track frame, a support plate fixed to the support member and extending toward the sprocket, and a buffer member on the support plate. It consists of a sliding plate mounted. For this reason, there is a problem that the number of parts is increased and the size is increased, so that the manufacturing cost of the entire crawler-type traveling device is increased.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to reduce a continuous striking sound caused by a crawler belt being wound around a sprocket in a polygonal shape over a long period of time, and It is another object of the present invention to provide a crawler-type traveling device capable of simplifying the configuration.

[0009]

In order to solve the above-mentioned problems, the present invention has side frames on both left and right sides of a center frame. One side of the side frames in the front-rear direction is a sprocket side bracket, and the other side is a sprocket side bracket. A track frame comprising an idler side bracket, a sprocket provided on a sprocket side bracket of the track frame, an idler provided on the idler side bracket, and a crawler track wound between the sprocket and the idler. Applicable to traveling devices.

A feature of the first aspect of the present invention is that a crawler belt receiving member is provided on the upper surface of the sprocket side bracket near the sprocket, and the crawler belt receiving member is provided with a screw hole in a vertical direction. A base block formed as a block body formed and fixed to the upper surface of the sprocket-side bracket, and a crawler body formed as a block body having a through hole formed in a vertical direction at a position corresponding to a screw hole of the base block. In order to detachably attach the skid block to the base block, the skid block serves as a sliding contact surface, and mounting screws fastened from the through holes of the skid block to the screw holes of the base block. is there.

[0011] According to the above configuration, the crawler belt that is driven to rotate between the sprocket and the idler is substantially tangentially wound around the sprocket by sliding on the crawler belt sliding contact surface of the skid block. Thereby, the vertical movement when the crawler belt is wound around the sprocket in a polygonal shape is suppressed, and the continuous striking sound when the crawler belt and the sprocket mesh with each other can be reduced.

[0012] Moreover, a screw hole is formed in the vertical direction of the base block, and the skid block is mounted on the base block by a mounting screw fastened to the screw hole, thereby acting downward on the skid block from the crawler belt. The load acts as an axial tensile force on the mounting screw. Therefore, it is possible to prevent the mounting screw from being broken, for example, as compared with a case where a load acts as a shearing force on the mounting screw.

Further, the invention of claim 2 is that the through hole of the skid block is formed as an elongated hole extending in the front-rear direction.

According to the above configuration, when the mounting screw inserted into the through hole of the skid block is fastened to the screw hole of the base block, the skid block is moved in the longitudinal direction within the range of the elongated hole. be able to. This allows
The mounting position of the skid block can be adjusted in the front-rear direction, and the crawler belt sliding contact surface of the skid block can always be in sliding contact with the crawler belt.

Further, the invention of claim 3 is that the crawler belt sliding contact surface of the skid block is formed substantially parallel to the tangent line so that the crawler belt is wound tangentially to the sprocket. .

According to the above construction, the crawler belt wound around the sprocket is brought into sliding contact with the crawler belt sliding contact surface of the skid block, so that the crawler belt can be guided to be tangentially wound around the sprocket.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described in detail with reference to the drawings shown in FIGS.

First, FIGS. 1 to 8 show a first embodiment according to the present invention.
Is shown.

In FIG. 1, reference numeral 1 denotes a lower traveling body of a hydraulic shovel, and 2 denotes a track frame constituting the lower traveling body 1. The track frames 2 are disposed on a center frame 3 and on both left and right sides of the center frame 3. And a pair of side frames 4 (only one is shown) extending in the front-rear direction.

A sprocket-side bracket 5 is provided on one side of the side frame 4 in the front-rear direction, and an idler-side bracket 6 is provided on the other side.

As shown in FIGS. 2 to 4, the sprocket-side bracket 5 is fixed to a connection end plate 7 fixed to one end of the side frame 4 by welding or the like.

The sprocket-side bracket 5 is
A thick mounting plate 8 having a large-diameter hole 8A for mounting a traveling motor 13 described later, a plurality of screw holes 8B provided around the large-diameter hole 8A, and an upper outer periphery of the mounting plate 8 An upper reinforcing plate 9 for covering, a lower reinforcing plate 10 for covering a lower outer periphery,
Semicircular rear reinforcing plate 11 fixed to the side surface of mounting plate 8
And the upper reinforcing plate 9 forms the upper surface of the sprocket-side bracket 5.

The upper edge of the mounting plate 8 to which the upper reinforcing plate 9 is fixed is inclined upward by an angle θ with respect to the horizontal direction as shown in FIG. The plate 9 is also configured to be inclined upward by the angle θ.

Reference numeral 12 denotes a driving device mounted on the sprocket side bracket 5. The driving device 12 includes a traveling motor 13, a speed reducer 14 for reducing the rotation of the traveling motor 13, and an output side of the speed reducer 14. And an attached sprocket 15. And the traveling motor 13
Is reduced by the speed reducer 14 and the sprocket 15 is driven to rotate, whereby the crawler belt 19 wound around the idler 16 to be described later is driven to rotate.

Reference numeral 16 denotes an idler attached to the idler-side bracket 6, and the idler 16 is
A crawler belt tension adjusting device (not shown) provided therein always urges the crawler belt 19 in a direction away from the sprocket 15, thereby giving an appropriate tension to the crawler belt 19 wound around the sprocket 15.

Reference numerals 17 and 17 denote two upper rollers rotatably provided on the upper surface side of the side frame 4.
7 prevents the crawler belt 19 from contacting the side frame 4 while supporting the crawler belt 19 from below. 18, 18,
Are a plurality of lower rollers arranged in a row on the lower surface side of the side frame 4, and each lower roller 18 supports the side frame 4 on a crawler belt 19 together with a sprocket 15 and an idler 16.

Reference numeral 19 denotes a sprocket 15, an idler 16,
The crawler belt wound around each upper roller 16 and each lower roller 17 is shown. As shown in FIGS. 5 and 6, the crawler belt 19 is formed endless by sequentially connecting a plurality of links 20 with pins 21, and has a cylindrical shape meshing with the sprocket 15 on the outer peripheral side of the pins 21. A bush 22 is fitted, and a plate-like shoe 23 is fixed to each link 20.

Numeral 24 denotes a crawler belt receiving member provided near the sprocket 15 and provided on the upper reinforcing plate 9 of the sprocket side bracket 5, and this crawler belt receiving member 24 is shown in FIG.
As shown in the figure, the base unit includes a base block 25, a skid block 26, and mounting screws 27, which will be described later.

Reference numeral 25 denotes a base block fixed to the upper surface of the upper reinforcing plate 9 by welding or the like.
5 is a steel block formed in a rectangular parallelepiped shape. The base block 25 is provided with two screw holes 25A, 25A vertically spaced apart in the front-rear direction.

Reference numeral 26 designates each mounting screw 2 on the base block 25.
7 shows a skid block removably attached by 7. The skid block 26 has a substantially trapezoidal steel block main body 26 </ b> A and a flat mounting plate fixed to one side surface of the block main body 26 </ b> A. And a portion 26B.

Here, on the upper surface side of the block main body 26A, there is formed a crawler belt sliding contact surface 26C which slides on the lower surface of the crawler belt 19, and this crawler belt sliding contact surface 26C, as shown in FIG. The sprocket 15 is formed so as to be substantially parallel to a tangent L to the pitch circle P of the sprocket 15 in order to guide the coil 15 to be wound in a tangential direction. Further, both ends in the front-rear direction of the block main body 26A are chamfered in a curved shape to prevent a seam between the links 20 from being caught when the links 20 constituting the crawler belt 19 are in sliding contact with the block main body 26A.

On the other hand, the mounting plate portion 26B is provided at a position separated from the lower surface of the block main body 26A by the height of the base block 25 as shown in FIG.
A step 26D is formed between the lower surface of 6A and the mounting plate 26B. The lower surface of the block main body 26 </ b> A contacts the upper surface of the upper reinforcing plate 9 in a state where the stepped portion 26 </ b> D is engaged with the base block 25.

Reference numerals 26E and 26E denote two long holes as through holes provided in the mounting plate portion 26B at the same pitch as the screw holes 25A of the base block 25. Each long hole 26E extends in the front-rear direction. It is formed in the mounting plate 26B.

Numerals 27, 27 designate two mounting screws for mounting the skid block 26 to the base block 25. Each mounting screw 27 is reinforced by an upper hole 26E formed in a mounting plate portion 26B of the skid block 26. It is fastened to each screw hole 25A of the base block 25 from a direction (vertical direction) substantially orthogonal to the upper surface of the plate 9.

Thus, when the lower surface of the crawler belt 19 slides on the crawler belt sliding contact surface 26C of the skid block 26 and a downward load is applied to the skid block 26 from the crawler belt 19, the load from the crawler belt 19 is increased. It is configured to act as a tensile force on the mounting screw 27 in the axial direction.

When the skid block 26 is mounted on the base block 25 by the mounting screws 27,
As shown by a two-dot chain line in FIG. 8, the skid block 26 moves in the front-rear direction on the upper reinforcing plate 9 within the range of each elongated hole 26E provided in the mounting plate portion 26B, and is attached to the upper reinforcing plate 9. Can be adjusted. In this case, since the upper reinforcing plate 9 is inclined upward by an angle θ with respect to the horizontal direction, by adjusting the mounting position of the skid block 26, the crawler belt sliding contact surface 26C of the skid block 26 is adjusted.
The distance between the link and the lower surface of each link 20 constituting the crawler belt 19 can be adjusted.

In this embodiment, the crawler belt 19 is wound around a sprocket 15, an idler 16, an upper roller 17 and a lower roller 18, and the idler 1
An appropriate tension is applied by a crawler belt tension adjusting device (not shown) provided between the side frame 4 and the side frame 4. When the sprocket 15 is rotationally driven in this state, the sprocket 15 sequentially meshes with each bush 22 forming the crawler belt 19, so that the crawler belt 19 is driven to rotate and the lower traveling body 1 travels (reverses).

At this time, the crawler belt receiving member 24 provided on the upper reinforcing plate 9 of the sprocket side bracket 5 always slides the crawler belt sliding contact surface 26C of the skid block 26 on the lower surface of the crawler belt 19 (each link 20). To support the crawler belt 19 from below. As a result, as shown in FIG.
When the bush 2 is wound around the sprocket 15, each bush 2
The line connecting the centers of the two keeps the state of the tangent L to the pitch circle P of the sprocket 15.

Thus, the skid block 26 is
9 is guided so as to be wound substantially tangentially to the sprocket 15 so that the crawler belt 19 is
Up and down movement when the crawler belt 19 is wound into a polygonal shape can effectively reduce continuous striking sound generated when the crawler belt 19 meshes with the sprocket 15.

In this case, each mounting screw 27 for mounting the skid block 26 to the base block 25 is formed by a corresponding one of the elongated holes 26E formed in the mounting plate 26B of the skid block 26.
Through the screw holes 25A of the base block 25 from above and below, when a downward load is applied to the skid block 26 from the crawler belt 19, the load from the crawler belt 19 is reduced by each mounting screw. 27 will act as a tensile force in the axial direction. Thereby, for example, breakage of each mounting screw 27 can be prevented as compared with a case where a load from the crawler belt 19 acts as a shearing force on each mounting screw 27.

Further, the skid block 26 is formed from a single block body, and the skid block 26 is attached to the base block 25 fixed to the upper reinforcing plate 9 of the sprocket side bracket 5 by the respective mounting screws 27. Further, the configuration can be simplified as compared with the crawler belt receiving member according to the related art, and the cost of the entire crawler type traveling device can be reduced.

When the crawler belt sliding contact surface 26C of the skid block 26 is worn out by constantly sliding on each link 20 of the crawler belt 19, the mounting screws 27 are temporarily loosened, as shown in FIG. As shown by the two-dot chain line, the skid block 26 is moved toward the sprocket 15 within the range of the elongated hole 26E formed in the mounting plate portion 26B. in this case,
Since the upper reinforcing plate 9 is inclined upward by an angle θ with respect to the horizontal direction, by moving the skid block 26 toward the sprocket 15, the worn crawler belt sliding contact surface 2 is moved.
6C can be appropriately slid on the lower surface of each link 20.

As described above, even if the crawler belt sliding contact surface 26C of the skid block 26 is worn, the mounting position of the skid block 26 can be adjusted in the front-rear direction within the range of each elongated hole 26E provided in the mounting plate portion 26B. Crawler belt sliding contact surface 2
6C can always be kept in sliding contact with the lower surface of the crawler belt 19.

As a result, the crawler belt 19 is connected to the sprocket 15
Can be kept substantially tangential to the sprocket 15, and continuous hitting sound generated by the crawler belt 19 meshing with the sprocket 15 can be reduced over a long period of time.

Next, FIGS. 9 and 10 show a second embodiment according to the present invention. In this embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 31 denotes a crawler belt receiving member according to the present embodiment. Like the crawler belt receiving member 24 according to the first embodiment, the crawler belt receiving member 31 includes a base block 25 and a skid block 32 described later. , But the configuration of the skid block 32 is different from that of the skid block 26 according to the first embodiment.

Reference numeral 32 denotes a skid block applied to the present embodiment in place of the skid block 26 according to the first embodiment. This skid block 32 is a trapezoidal block having a larger width than the skid block 26. Is formed on the upper surface side of the crawler belt sliding contact surface 32A
Is provided. In addition, a step portion 32B that engages with the base block 25 is formed over the entire length at a lower portion of one side surface of the skid block 32, and an upper side of the step portion 32B is a flange portion 3 that contacts the upper surface of the base block 25.
2C.

Reference numerals 32D and 32D denote two long holes as through holes formed in the flange portion 32C of the skid block 32. Each long hole 32D corresponds to each screw hole 25 of the base block 25.
It extends in the front-rear direction with a pitch equal to A. Then, the skid block 32 is attached to the base block 25 by tightening each mounting screw 27 into the screw hole 25A of the base block 25 through the elongated hole 32D. At this time, the skid block 32 is fixed within the range of the elongated hole 32D. The mounting position can be adjusted in the front-back direction.

A counterbore 32E is formed in the flange 32C above the elongated hole 32D. The counterbore 32E forms a flat surface on which the mounting screw 27 is seated. The head of the mounting screw 27 is housed therein.

The crawler belt receiving member 31 according to the present embodiment has the above-described configuration. By adjusting the mounting position of the skid block 32 in the front-rear direction within the range of each of the long holes 32D provided in the flange portion 32C, Crawler belt sliding contact surface 32A
Can always be brought into sliding contact with the crawler belt 19. As a result, the skid block 32 moves the crawler belt 19 to the sprocket 1
By guiding the crawlers 5 so as to wind them in the tangential direction, the continuous striking sound generated by the crawler belt 19 meshing with the sprocket 15 can be reliably reduced over a long period of time.

In each of the above embodiments, each of the screw holes 2 of the base block 25 is provided in the skid block 26 (32).
Two long holes 26E (32
Although the case where D) is drilled is described as an example, the present invention is not limited to this. For example, as one configuration in which one long hole having a length corresponding to the pitch of each screw hole 25A is drilled. Is also good.

Further, in each of the above embodiments, the case where two long holes 26E (32D) of the skid block 26 (32) are provided apart from each other in the front-rear direction is taken as an example, but the present invention is not limited to this. Instead, for example, three or more long holes may be provided, and the long holes 26E (32D) may be provided separately in the left-right direction.

In the above-described embodiment, the crawler-type traveling device used for the lower traveling body of the hydraulic shovel has been described as an example. However, the present invention is not limited to this. The present invention can also be applied to a lower traveling body of an expression vehicle.

[0054]

As described above in detail, according to the first aspect of the present invention, a crawler belt receiving member is provided near the sprocket on the upper surface of the sprocket side bracket, and the crawler belt of the skid block constituting the crawler belt receiving member is provided. Since the crawler belt is configured to be wound substantially tangentially to the sprocket by sliding the crawler belt on the sliding contact surface, vertical movement when the crawler belt is wound in a polygonal shape with respect to the sprocket is suppressed, and The continuous striking sound generated when the sprocket meshes can be effectively reduced.

In this case, each mounting screw for mounting the skid block to the base block is fastened to the screw hole of the base block from above and below through a through hole formed in the skid block. The load acting from the crawler belt acts as an axial tension on the mounting screw. Thereby, breakage of the mounting screw and the like can be prevented as compared with the case where the load acting on the skid block acts as a shearing force on the mounting screw.

Further, since the crawler belt receiving member is composed of the base block, the skid block, and the mounting screws, the configuration can be simplified as compared with the crawler belt receiving member of the prior art, and the cost of the entire crawler type traveling device can be reduced. can do.

According to the second aspect of the present invention, the through hole of the skid block is formed as a long hole extending in the front-rear direction. , The crawler belt sliding contact surface of the skid block can be constantly in sliding contact with the crawler belt. Therefore, for example, even if the crawler belt sliding contact surface of the skid block is worn, by adjusting the mounting position of the skid block, the worn crawler belt sliding contact surface can be always in sliding contact with the crawler belt, and the crawler belt is wound around the sprocket. The continuous blow sound at the time can be reliably reduced over a long period of time.

According to the third aspect of the present invention, the crawler belt sliding contact surface of the skid block is formed substantially parallel to the tangent line so that the crawler belt is wound tangentially to the sprocket. Can be always guided to be tangentially wound around the sprocket, and the continuous striking sound generated when the crawler belt and the sprocket mesh with each other can be reliably reduced.

[Brief description of the drawings]

FIG. 1 is an external view showing a lower traveling body to which a crawler-type traveling device according to a first embodiment is applied.

FIG. 2 is an exploded perspective view showing a sprocket-side bracket, a crawler belt receiving member, and the like in FIG. 1 in an enlarged manner.

FIG. 3 is a partially enlarged view showing a sprocket as a two-dot chain line, such as a sprocket-side bracket and a crawler belt receiving member in FIG. 1;

FIG. 4 is a plan view as seen from a direction indicated by arrows IV-IV in FIG. 3;

FIG. 5 is a partially enlarged view showing a state where the skid block is in sliding contact with the lower surface of the crawler belt.

6 is a cross-sectional view as seen from the direction of arrows VI-VI in FIG. 5;

FIG. 7 is an exploded perspective view showing an enlarged crawler belt receiving member.

FIG. 8 is a partially enlarged view showing a state where the skid block is moved on the sprocket-side bracket.

FIG. 9 is a view showing a crawler belt receiving member according to a second embodiment;
It is sectional drawing of the same position as (3).

FIG. 10 is an exploded perspective view showing a crawler belt receiving member according to a second embodiment.

[Explanation of symbols]

 2 track frame 3 center frame 4 side frame 5 sprocket side bracket 6 idler side bracket 15 sprocket 16 idler 19 crawler belt 24, 31 crawler belt receiving member 25 base block 25A screw hole 26, 32 skid block 26C, 32A crawler belt sliding contact surface 26E, 32D Slotted hole (through hole) 27 Mounting screw

Claims (3)

[Claims] 1. A track frame having side frames on both left and right sides of a center frame, one side of the side frame in the front-rear direction being a sprocket side bracket, and the other side being an idler side bracket, and a sprocket side bracket of the track frame. A crawler-type traveling device, comprising: an idler provided on a sprocket and an idler-side bracket provided on the crawler; and a crawler belt wound between the sprocket and the idler. A crawler belt receiving member is provided at a position, and the crawler belt receiving member is formed as a block body having a screw hole formed in a vertical direction, and is fixed to an upper surface of the sprocket side bracket; Vertically transparent at the position corresponding to the hole A skid block formed as a block body having a hole formed therein and having an upper surface serving as a crawler belt sliding contact surface, and a screw hole of the base block through a through hole of the skid block for detachably attaching the skid block to the base block. And a mounting screw fastened to the crawler belt. 2. The crawler-type traveling device according to claim 1, wherein the through hole of the skid block is formed as an elongated hole extending in the front-rear direction. 3. The crawler belt sliding contact surface of the skid block,
The crawler-type traveling device according to claim 1, wherein the crawler belt is formed substantially parallel to the tangent so as to be wound tangentially to the sprocket.