JPH1059005A - Traveling vehicle pedal operation structure - Google Patents

Abstract

(57) [Problem] To enable a manual control valve to be used and to easily attach an operation pedal from above even if there is a cover body covering the control valve. SOLUTION: In order to control the speed of a hydraulic motor of a traveling device by operating a control valve B1, an operation pedal 41 which can be depressed and an operation member 44 which moves a spool 48 of the control valve by depressing the operation pedal are provided. The operation pedal is supported on the support member 43 so as to be movable substantially vertically and can be freely inserted and removed, and the lower end of the pedal abuts on the operating member so as to transmit an operation force, and the operation pedal is inserted into the cover body 6 covering the control valve B1. An opening 42 and a notch 42a extending outward from the opening are formed, and when the operation pedal is inserted into the opening, the operation pedal is turned and then the operation pedal is turned to abut on the cover body to prevent the operation pedal from coming off. The engaging portion 41a to be formed is formed on the operation pedal, and a regulating member 49 for regulating that the engaging portion faces the notch is disposed below the cover body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pedal operation structure for a traveling vehicle which can be used for a backhoe having a traveling device driven by a hydraulic motor.

[0002]

2. Description of the Related Art A backhoe is provided with a crawler type traveling device driven by a swash plate transmission type hydraulic motor,
A turning table is supported on the traveling device so as to be rotatable about a vertical axis, and a control valve for changing the swash plate angle of the hydraulic motor to perform a shift operation is mounted on the turning table, and a spool of the control valve is operated by an operation pedal. It is made to operate by the depressing operation of.

That is, when the operation pedal is depressed, the switch is turned on, the electromagnetic control valve is actuated by an electric signal, and the swash plate angle switching mechanism of the hydraulic motor of the traveling device is driven at a low speed by the pressure oil from the electromagnetic control valve. It is configured to operate from the side to the high-speed side, thereby switching the hydraulic motor of the traveling device at a high speed.

[0004]

In the above-mentioned prior art, the cost of the electromagnetic control valve is high due to its high cost, and the spool is directly operated by depressing the operation pedal using a manual control valve. It is considered to be a mechanical type, but if it is a mechanical type, a link and a rod are required in the operating force transmission system from the operation pedal to the control valve, and the cover body covering the control valve becomes an obstacle, May be difficult to assemble.

[0005] In particular, in a type in which a cover body that covers the upper surface of the revolving base is divided into two right and left parts and is moved from the left and right and is aligned at the center side, the operation pedal is penetrated through the cover body and the lower end thereof is connected with a link or the like. In order to connect with the cover, it is difficult because of the small installation space, and it is necessary to form a long hole through which dust and water etc. easily enter in order to penetrate it. Requires a large arrangement space, and it is difficult to secure such an arrangement space.

In view of the above, the present invention provides an operating member for moving a spool of a control valve, abuts an operating pedal penetrating a cover so as to transmit an operating force to the operating member, and allows the operating pedal to move up and down. By preventing unintentional removal from the cover body, a manual control valve can be used,
An object of the present invention is to provide a pedal operation structure for a traveling vehicle in which an operation pedal can be easily assembled from above even if there is a cover body that covers a control valve.

[0007]

A specific means for solving the problem in the present invention is to operate the traveling device 2 by operating the control valve B1.
In order to control the speed of the hydraulic motor M1, the operation pedal 41 which can be depressed and an operating member 44 which moves the spool 48 of the control valve B1 by depressing the operation pedal 41 are provided. An opening 42 through which the operating pedal 41 is inserted into the cover body 6 that covers the control valve B1 so that the lower end of the pedal abuts on the operating member 44 so that the operating force can be transmitted. And a notch 42a extending outward from the cover body 6. When the operation pedal 41 is inserted into the opening 42, the notch 42a passes through the notch 42a and then the operation pedal 41 is turned to abut on the cover body 6 to prevent the operation member 41 from coming off. Locking part 41
a is formed on the operation pedal 41, and a regulating member 49 for regulating that the locking portion 41 a faces the notch 42 a is disposed below the cover body 6.

As a result, the manual control valve B1 can be directly operated by the operation pedal 41, and even if the control valve B1 is covered with the cover body 6, the operation pedal 41 can be operated from above.
Can be attached to and detached from the support member 43 through the opening 42, and the locking portion 41 a is prevented from falling out of the notch 42 a by the regulating member 49. A second specific means for solving the problem in the present invention is that, in addition to the first specific means, the support member 43 is formed in a cylindrical shape and is attached to a regulating member 49.

As a result, the regulating member 49 is connected to the supporting member 4.
3, and the position setting of the regulating member 49 and the notch 42a is easily determined.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 5 to 8, reference numeral 1 denotes a so-called small rear-small turning backhoe, and the backhoe 1 is mainly composed of a traveling device 2, a turning machine body 3, and an excavator 4.

Hereinafter, the traveling direction of the backhoe 1 indicated by an arrow A in FIG. 6 is referred to as a front-rear direction, and the lateral direction indicated by an arrow B perpendicular to the front-rear direction is referred to as a left-right direction. Traveling device 2
Is provided with a pair of crawler traveling bodies 5 having a rubber crawler belt so as to be adjustable in the left-right space.
Is driven independently and simultaneously by a traveling hydraulic motor M1.
The traveling speed can be freely switched between a first speed (low speed) and a second speed (high speed) higher than this.

The traveling hydraulic motor M1 employs an axial piston hydraulic motor, and the hydraulic motor M1 is provided with a swash plate angle switching mechanism. When the swash plate angle switching mechanism is not operated, the swash plate angle switching mechanism is not used. The angle is small, and when activated, the swash plate angle changes significantly. The revolving machine body 3 includes a revolving base 7 in which a frame configured by combining frame members made of plate materials is covered with a cover body 6 serving as an outer shell.
A turning motor M2 supported rotatably around a vertical turning axis C by a bearing body 8 provided at a central portion between the left and right crawler running bodies 5 of the running device 2 and supported by a frame of the turning table 7. Thus, it is configured to be turned around the turning axis C.

A counterweight 9 is mounted at the rear of the frame of the swivel 7 to balance the weight with the excavator 4 mounted on the front of the swivel 7. Is provided with an operating member for operating hydraulic equipment provided on the traveling device 2, the turning body 3, the excavating device 4, and the like, and a control box 10 including a display panel and the like. As shown in FIG. 6, the rear side of the turning body 3 is formed in an arc shape having a center of curvature substantially at the turning axis C, and the turning locus circle drawn by the rear side of the turning body when turning makes the left and right crawlers. The traveling device 2 when the left and right width of the traveling body 5 is the largest.
It is housed within the left and right widths.

The left and right widths of the turning body 3 are formed to be narrower than the diameter of the turning locus circle drawn by the rear surface of the turning body. It is configured such that the edge is located at a position substantially coincident with the left and right side surfaces of the turning machine body 3. The cover body 6 is formed of resin or sheet metal, and as shown in FIG. 8, an upper wall 6a constituting a floor, and the upper wall 6a.
a front wall portion 6b integrally extending downward from the front edge of
And a side wall portion 6c integrally extending downward from an outer edge in the left-right direction of the upper wall portion 6a.

On the front left side of the cover body 6, an upper wall 6
a protruding portion 11 which is substantially rectangular in plan view and protrudes upward from the control box 10 is provided on the upper wall 11a of the protruding portion 11 in order to protrude the support frame in the control box 10. An opening substantially corresponding to the lower end outer peripheral shape of is formed,
The base portion 10A (shown in FIG. 3) of the support frame in the control box 10 is fixed to the frame side in the swivel 7 and is covered with the bulging portion 11.

The cover body 6 is divided into two parts at the center in the left-right direction of the bulging portion 11.
L and 6R are joined in a split portion from the outside in the left-right direction toward the center from the outside in the left-right direction, and are detachably attached and fixed to attachment portions provided on the frame of the revolving base 7 via bolts. In addition, the joining part of the left and right cover components 6L and 6R is configured to wrap up and down on the upper surface side and to wrap forward and backward on the front surface side.

The opening between the rear edge of the upper wall 6a of the cover body 6 and the weight 9 is opened upward, and the opening 13 and the upper part of the weight 9 are closed by a bonnet 14. The lower end of the rear end is pivotally connected to the weight 9 via a hinge so as to be rotatable around an axis in the left-right direction, and can be opened and closed. The front wall 6b of the cover body 6
An opening 16 is formed on the right side of
From 6, a front end side of a pair of upper and lower support brackets 17 that are supported by or constitute a part of the frame of the swivel 7 protrudes. The swing bracket 1 is attached to the front end of the support bracket 17 via a vertical support shaft 18.
9 is pivotally supported to be able to swing right and left.

The right side of the front surface of the cover body 6 is greatly inclined rearward from the center in the left-right direction toward the outside, and the support shaft 18 is located rearward of the front end of the swivel base 7 and of the control box 10. It is located forward from the rear end. As a result, stability is ensured during excavation, and the passage space formed between the control box 10 and the bonnet 11 can get on and off from either the left or right and can pass in the left and right direction.

On the right side of the swing bracket 19, a piston rod of a swing cylinder 20 arranged on the right end side in the swivel 7 is pivotally connected. Is spindle 1
The excavator 4 is swung right and left around eight turns. The excavator 4 includes a boom 21 having a base pivotally attached to a swing bracket 19 so as to be swingable about a left-right axis.
And an arm 22 pivotally attached to the distal end side of the boom 21 so as to be swingable around the left and right axes, and a bucket 23 attached to the distal end side of the arm 22 so as to be free to squeeze and dump.

The boom 21 includes a boom cylinder 24 provided between the swing bracket 19 and the middle of the boom 21.
The arm 22 is oscillated by an arm cylinder 25 provided between the middle of the boom 21 and the base of the arm 22, and the bucket 23 is attached to the base of the arm 22 and the mounting portion of the bucket 23. A squeeze and dump operation is performed by a bucket cylinder 26 provided between the squeeze and dump cylinders.

The bonnet 14 behind the control box 10
A driver's seat 28 is provided on the upper side, and inside the hood 14,
An engine 29, a radiator 30, a hydraulic pump 31 driven by the engine 29, a fuel tank 32 for the engine 29, a hydraulic oil tank 33 for each hydraulic device, and the like are housed. The engine 29 is disposed horizontally at the center of the swivel 7 in the left-right direction, and the crankshaft center of the engine 29 is substantially aligned with the left-right direction of the swivel 7. A radiator 30 is arranged on the right side of the engine 29, and multiple (3 to 4) hydraulic pumps 31 are arranged and fixed on the left side of the engine 29. The hydraulic pump 31 is an output shaft of the engine 29. It is adapted to be driven by.

A muffler 34 is disposed above the hydraulic pump 31 in the front-rear direction, a fuel tank 32 formed long in the front-rear direction is disposed below the hydraulic pump 31, and a hydraulic oil A tank 33 is provided. The hydraulic oil tank 33 is formed integrally with the weight 9 by being recessed from above, and is formed to be horizontally long in the left-right direction. A tank 35 is provided. A battery 36 is provided on the left side of the auxiliary tank 35.
Is fixed.

Also, on the upper right rear of the engine 29,
An air cleaner 37 is disposed in the left-right direction, and an intake hose 38 of the air cleaner 37 extends from the air cleaner 37 to the front of the engine 29 bypassing the left side of the upper portion of the engine 29 and extends rightward in the upper front of the engine 29. The radiator 30 extends downward to the front right side of the radiator 30 and downward to the lower side of the radiator 30.

A canopy 40 is detachably mounted on the backhoe 1, and the columns of the canopy 40 are attached and fixed to the left and right sides of the weight 9. In FIGS. 1 to 5, control valves B1 to B10 for controlling respective hydraulic devices are arranged in a swivel 7 below a control box 10, and control valves B1 to 10 are provided.
Are arranged in the left-right direction and connected to each other by overlapping, and they are attached and fixed to a bracket 27 fixed to a frame of the swivel 7.

The control valves B1 to B10 will be briefly described in order from the left. B1 is a manual control valve for operating a swash plate angle switching mechanism of the traveling hydraulic motor M1.
Is a control valve for the swing motor M2, B3 is a control valve for the arm cylinder 25, B4 is a control valve for driving the hydraulic motor M1 of the left traveling body 5, and B5 is a hydraulic valve for driving the dozer. The control valve B6 drives the hydraulic breaker or the like when the backhoe 1 is equipped with another hydraulic device, for example, when a hydraulic breaker, a hydraulic auger or the like is attached instead of the bucket 23 of the excavator 4. B7 is a control valve for driving the hydraulic motor M1 of the right traveling body 5, a control valve for the B8 bucket cylinder 23, B9 is a control valve for the boom cylinder 24, and B10 Is a control valve for the swing cylinder 20.

The arrangement of the control valves B1 to B10 can be changed as appropriate. Usually, a manual valve is used for the control valves B4, B6, B7 and the like. An operation pedal 41 for switching the speed of the traveling device 2 to a high speed side is disposed above the left front portion of the swivel 7. The operation pedal 41 is connected to the traveling hydraulic motor M1.
The swash plate angle switching mechanism is arranged at a position facing the manual control valve B1.

The operation pedal 41 is connected to the bulging portion 11 of the cover 6.
Is penetrated through an opening 42 formed in the left part of the upper wall 11a, and is inserted into a cylindrical support member 43 so as to be freely inserted and removed, and a lower end thereof is an operating member (lever) for pushing a spool of the control valve B1. It is in contact with 44 power points. One end of the lever-shaped operating member 44 is pivotally supported by a bracket 27 via a fulcrum pin 45, and a plate 46 forming a force point is fixed to the other end, and a roller 47 forming an action point in the middle is provided via a pin. The roller 47 is held in contact with the spool 48 of the control valve B1, and the plate member 46 is moved downward to push down the spool 48 and actuate the control valve B1 to switch the swash plate angle switching mechanism.

The swash plate angle switching mechanism includes, for example, a control valve B
The switching valve is switched by the hydraulic oil from No. 1 so that the hydraulic oil passing through the hydraulic motor M1 is partially branched to flow to the switching cylinder, and the swash plate is pushed by the switching cylinder. An opening 4 is formed in the upper wall 11a of the bulging portion 11.
A notch 42a extending outward from 2 is formed,
A locking portion 41 through which the notch 42a is inserted when the operation pedal 41 is inserted into the opening 42 is provided on the rod portion of the operation pedal 41.
a is formed.

The locking portion 41a is formed by penetrating a pin of a rod portion of the operation pedal 41, and is moved below the upper wall 11a by rotating the operation pedal 41. Preventing the opening 42 from coming off. The locking portion 41a may be formed by integrally forming a projection on the rod portion. The support member 43 is formed of a pipe, and the base 10 of the support frame of the control box 10 is provided.
A is fixed substantially vertically (slightly inclined rearward) to the rear end of the support plate 64 to which A is fixed, and guides the operation pedal 41 up and down freely.

The rear end of the support plate 64 is substantially opposed to the notch 42a below the opening 42, and the operation pedal 41 is
When the locking portion 41a is inserted through the notch 42a when the operation pedal 41 is inserted through the notch 42a, it comes into contact with the rear end portion, thereby causing the necessity of turning the operation pedal 41 artificially. That is, the support plate 6
The rear end of the support plate 64 also serves as a restricting member 49 for restricting the engaging portion 41a from opposing the notch 42a. The stopper 41a moves up and down along the regulating member 49) and does not unintentionally oppose the notch 42a. Therefore, even when the operation pedal 41 moves upward, the locking portion 41a abuts on the upper wall 11a at a place other than the notch 42a. Is prevented from going upward.

Then, the operation pedal 41 is turned while being pulled out of the support member 43 artificially, so that the locking portion 4 is rotated.
1a faces the notch 42a, and can be pulled out from the opening 42 upward. In the above-described configuration, the control valve B1 is simply inserted into the opening 42 and supported by the support member 43 after the right and left two-part cover body 6 is attached so as to be aligned at the center from the left and right outer sides. Operating member 44 can be directly pushed and operated, and even when the spool 48 of the control valve B1 is returned by the return spring, the operation pedal 41 is not detached from the support member 43, and high-speed traveling is performed. When operation is not required, the operation pedal 41
Can be easily removed. Further, since the operation pedal 41 is arranged at the root of the control box 10, it can be compactly arranged in a small arrangement space, and moves at a short distance and substantially in the same direction as the spool 48 of the control valve B1. Extremely short and simple in construction.

In FIGS. 1 to 3, reference numeral 70 denotes a constituent member of a frame of the swivel table 7, and in FIGS.
Reference numeral 72 denotes a turning lock lever of the turning table 7. Note that the present invention is not limited to the above embodiment, and can be variously modified. For example, the operating member 44 is formed of a rod guided so as to be linearly movable, and one end of the rod is in contact with the operation pedal 41 and the other end is in contact with the spool 48. 48 or the operating member 44
Is constituted by a lever in contact with the spool 48 and a rod in contact with the point of force, the rod is inserted into and supported by the support member 43, and the lower end of the rod portion of the operation pedal 41 can be inserted into and removed from the upper part of the rod. Or it may be made to insert in.

[0033]

According to the present invention described in detail above, the control valve B
Opening 4 through which operation pedal 41 is inserted through cover body 6 covering
2 and a notch 42a extending outward from the opening 42, and when the operation pedal 41 is inserted into the opening 42, the operation pedal 41 is rotated after passing through the notch 42a, thereby making contact with the cover body 6. Locking portion 41a that comes in contact and is prevented from coming off
Is formed on the operation pedal 41, and the restricting member 4 for restricting the engagement portion 41 a from opposing the notch 42 a below the cover body 6.
9, the control valve B1 can be operated manually and easily and directly with the operation pedal 41. Even if the control valve B1 is covered with the cover 6, the operation pedal 41 can be operated from above. Can be attached and detached, and can be reliably prevented from falling out of the state supported by the support member 43 with a simple configuration.

Further, since the supporting member 43 is formed in a cylindrical shape and is attached to the regulating member 49, the regulating member 49 can also be used for attaching the supporting member 43.
The position setting of 2a can be easily and reliably determined. A swing pedal 63 for operating the control valve B10 to operate the swing cylinder 20 is provided on the right side of the bulging portion 11 of the cover body 6.
The auxiliary control valve B6 is provided on the left side of the bulging portion 11.
Attachment operation pedal 67 for operating
A pedal shaft for the swing pedal 63 and a pedal shaft 69 for the attachment operation pedal 67 are supported by a support plate 64.

[Brief description of the drawings]

FIG. 1 is a sectional side view showing a main part of an embodiment of the present invention.

FIG. 2 is a plan view of the main part.

FIG. 3 is a sectional front view of the same.

FIG. 4 is a sectional plan view of the same.

FIG. 5 is an overall plan view of the inside of the swivel base.

FIG. 6 is an overall plan view of the backhoe.

FIG. 7 is an overall side view of the backhoe.

FIG. 8 is a front view of a cover body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Backhoe (traveling vehicle) 2 Traveling device 3 Revolving machine body 6 Cover body 7 Revolving base 10 Operation box 41 Operation pedal 41a Locking part 42 Opening 42a Notch 43 Support member 44 Operating member (lever) 49 Restriction member M Hydraulic motor for traveling

Claims (2)

[Claims] The traveling device (2) is operated by operating a control valve (B1).
In order to control the speed of the hydraulic motor (M1), an operation pedal (41) that can be depressed and an operating member (44) that moves the spool (48) of the control valve (B1) by depressing the operation pedal (41) And the operation pedal (4
1) is supported on the supporting member (43) so as to be movable substantially vertically and can be freely inserted and removed, and the lower end of the pedal is connected to the operating member (4).
4) An opening (42) through which the operating pedal (41) is inserted into the cover body (6) covering the control valve (B1) so as to be able to transmit the operating force, and a notch extending outward from the opening (42). (42a), and the operation pedal (41) is opened (4).
When the operation pedal (41) is rotated after passing through the notch (42a) when inserted into 2), the engaging portion (41a) which comes into contact with the cover body (6) and is prevented from being pulled out is turned. 41), wherein a restricting member (49) for restricting the engaging portion (41a) from facing the notch (42a) is disposed below the cover body (6). Pedal operation structure. 2. The pedal operation structure for a traveling vehicle according to claim 1, wherein said support member (43) is formed in a cylindrical shape and is attached to a regulating member (49).