JPH022773Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention includes a cover body that is integrally formed with a front cover part in an upright position and an upper cover part in a substantially horizontal position, and is attached to the machine base so that it can be opened upwardly. , relates to a work vehicle equipped with an operating lever connected to an internal device at a portion covered by the cover body.

Conventionally, in the above-mentioned work vehicle, the various operation levers are made to pass through the upper cover part of the cover body, but the various operation levers are located in a complicated manner above the cover body, and the arrangement space is limited. In addition to being susceptible to the above restrictions, there is also the disadvantage that erroneous operation is likely to occur due to the close arrangement of the operating levers.

As a measure to eliminate this inconvenience, it is possible to arrange some of the operating levers so that they penetrate through the front cover part of the cover body instead of the upper cover part. If the cover body is simply disposed in a penetrating state, the operation lever must be removed each time the cover body needs to be opened and closed, making the operation of opening and closing the cover body cumbersome. There is a new problem in that it is extremely difficult to connect the operating lever that has been removed to open the cover to the internal device from outside the cover after the cover is closed.

The present invention mounts the operation lever in a position corresponding to the front cover part of the cover body that can be opened upwards, and avoids restrictions on the placement space of the lever and occurrence of erroneous operation. Its purpose is to facilitate the opening operation and restoration of the operating lever to its original state.

The feature of the present invention for achieving the above object is that the cover body, which is integrally formed with a front cover part in an upright position and an upper cover part in a substantially horizontal position, is moved upwardly with respect to the machine base. In a work vehicle that is releasably mounted and is equipped with an operating lever that connects to an internal device in a portion covered by the cover body, an insertion hole is formed in the front cover portion of the cover body, and the cover body is inserted in a position that penetrates through the insertion hole. The operating lever is disposed, and an end side of the operating lever inside the cover body is linked to the internal device, and the operating lever is inserted in the rod direction of the operating lever inserted into the insertion hole. Constructed for push-pull operation,
Further, a restricting tool is attached to the operating lever so that the limit of operation of the operating lever in the pushing direction is defined by contact with the front cover portion of the cover body, and the restricting tool is detachable from contact with the operating lever. The operating lever is configured such that the entire operation lever can be inserted into the inside of the cover body in a state where the contact is released, and further, a grip operation side end portion of the operation lever is disposed in a machine base portion inside the cover body. A holder is provided inside the cover body in the closed position and near the insertion hole of the front cover portion to lock the rod portion of the operating lever and maintain the position. This configuration provides the following effects and effects.

That is, when the restraining operation lever is made to pass through the front cover portion of the cover body, the operation lever is restricted from moving inward to the cover body with respect to the operation lever that passes through the insertion hole provided in the front cover portion. The rod of the operating lever can be moved inside the cover body by simply installing a restricting device and releasing the restricting action of the restricting device.In other words, there is no need to release the operating lever from the internal device. The cover body can be easily opened and closed by inserting it into the cover body.

In addition, the rod part of the operating lever inserted into the inside of the cover body is not placed in a difficult-to-handle location far from the insertion hole in the front cover part, but the end of the operating lever can easily be placed outside. Since it is held near the insertion hole where it can be easily pulled out, it has the advantage that it is easy to restore the operating lever to its original state from the closed state of the cover body.

Embodiments of the present invention will be described below based on the drawings.

As shown in Figures 1 and 2, the hydraulic motor
A rotating base 2 is mounted on a traveling machine base equipped with a pair of left and right traveling crawlers 1a and 1b that can be driven separately at Ma and Mb.
is mounted so that it can be driven and rotated around the vertical axis _X1 by a hydraulic motor Mc, an engine 3 is mounted on the rear of the swivel base 2, and a cabin 5 with a driver's seat 4 is mounted on the left side of the swivel base 2. A bracket 7 for supporting the backhoe device 6 is attached to the horizontal center of the front side of the swivel base 2 so that it can be driven and oscillated around the vertical axis _X2 by a hydraulic cylinder 8.
, the boom 9 is installed so that it can be driven up and down around the horizontal axis by a hydraulic cylinder 10, and the boom 9 is
The arm 11 is attached to the arm 12 so as to be swingable around the horizontal axis by a hydraulic cylinder 12, and the bucket 13 is attached to the arm 12 so as to be swingable around the horizontal axis by the hydraulic cylinder 14. The support arm 16 of the earth removal plate 15 is attached to the front part of the table so that it can be moved up and down by a hydraulic cylinder 17, and
A dozer/backhoe work vehicle is constructed that can perform dozer work and backhoe work.

For driving the various hydraulic actuators, a second
As shown in the figure, two main pumps Pa, Pb and 1
Auxiliary pumps Pc are provided directly connected to the engine 3,
One main pump Pa is connected to the left traveling crawler 1a.
control valve V ₁ of the hydraulic motor Ma for the swivel base 2, control valve V ₂ of the hydraulic motor Mc for the swivel base 2, control valve V ₃ of the arm hydraulic cylinder 12, and control valve V ₄ for speed-up drive of the boom hydraulic cylinder 10. are connected in parallel, and the pressure oil from the one main pump Pa is directly supplied to these control valves V ₁ ..., and the pressure oil from the one main pump Pa is connected to the pressure of the other main pump Pb. A merging valve _V5 is provided to switch between merging and supplying oil. other main pump
The control valve V ₆ of the hydraulic motor Mb for the right traveling crawler 1b is connected to Pb, and the control valve V ₇ of the bucket cylinder 14 and the boom cylinder 1 are connected to Pb.
Each of the control valves V ₈ of 0 is connected in parallel to the right motor control valve V ₆ so that the waste oil from the control valve V 6 is supplied, and the control valves for increasing the speed of the arm cylinder 12 are connected in parallel.
The control valves V ₉ and the control valves V ₁₀ for the service ports 18 and 18 are connected in parallel to the bucket control valve V ₇ and the boom control valve V ₈ so that pressure oil is supplied to them in their neutral states. Furthermore, the control valve _V11 of the bracket cylinder 8 and the control valve _V12 of the earth removal plate cylinder 17 are connected in parallel to the auxiliary pump Pc. Motsu, left and right crawler 1
A and 1b are driven separately by two main pumps Pa and Pb, so that they can move straight ahead, and the earth removal plate 3 is raised and lowered by an auxiliary pump Pc. Therefore, it is constructed so that it can move straight ahead even during dozer work.

Also, during dozer work, the boom 9 and
The arm 11 is configured to be able to operate at an increased speed. Furthermore, the vehicle is constructed so that the traveling speed can be switched between high and low speeds using a merging valve _V5 .

Furthermore, when the traveling crawlers 1a, 1b enter the recess and escape, etc., the bucket 13
The traveling crawlers 1a, 1b and the arm 9 are configured to be driven simultaneously so that an auxiliary propulsive force can be provided by swinging the arm 9 while the crawler is anchored to the ground. It has been done.

As shown in FIGS. 3 to 5, the swivel base 2 is in a state where a pair of stands 19, 19 for mounting the rectangular cylindrical operating levers for the backhoe device 6 are arranged separately on both sides of the driver's seat 4. The cover body 20 is integrally formed with a front cover part 20a in an upright position and an upper cover part 20b in a substantially horizontal position. The lower end side of the front cover portion 20a is removably bolted upward to the three receiving frames 21 fixed to the inner surface of the swivel base 2, and the lower end side of the front cover portion 20a is removably bolted upward to the step portion 22 of the swivel base 2. The driver's seat 4 is attached to the upper part of the cover body 20, and the internal device consisting of the various control valves V ₁ . , and is disposed so as to be inserted into the interior of the swivel base 2.

To explain the operation structure for the various control valves V _{1 .} . . , the base frame body of the first working lever 23 swings the boom 9 by swinging back and forth, and swings the bucket 13 by swinging left and right. 23a is externally supported on a front-rear shaft 25 which is rotatably supported by a horizontal shaft 24 of the right stand 19, and is rotatably supported by a front-rear shaft 25, and the arm 11 is rocked by back-and-forth rocking.
The base frame 26a of the second working lever 26, which rotates the swivel base 2 by swinging left and right, is attached to the left stand 19 with a structure similar to that described for the first working lever 23. be. Also, a cylindrical relay rotation shaft 27 for boom operation, a cylindrical relay rotation shaft 28 for bucket operation, a cylindrical relay rotation shaft 29 for arm operation,
Each of the swivel table operating cylindrical relay rotating shafts 30 is fitted onto the horizontal shaft 31 supported on the swivel table 2 so as to be relatively rotatable while being aligned in the axial direction thereof, and each of the rotating shafts 27... The lever connection arms 27A, 28A, 29A, 30A and the valve connection arms 27B, 28B, 29B, 30B are fixed to each of the first and second working levers 23, .
Arms 32a, 32 protrude forward and laterally from the base frames 23a, 26a of the 26 base frames 23a, 26a, respectively.
b, 33a, 33b are each connected by a ball joint to each of the links 34a, 34b, 34c, 34d which are connected to each of the lever connecting arms 27A by a ball joint. Furthermore, a boom link 35 that connects the two boom control valves V ₄ and V ₈ so that they can be operated simultaneously is rotated relative to the respective operation rods L ₄ and L ₈ about the vertical axis. an arm link 36 which is freely pivoted and connected so that the two arm control valves V ₃ and V ₉ can be operated simultaneously;
is pivoted to the operating links L ₃ and L ₉ of both valves so as to be relatively rotatable around the vertical axis, and the boom operating rod 35a is moved in the first stage by pushing or pulling with respect to the boom link 35. In order to be able to operate only the boom control valve V ₈ in the second stage movement, and also operate the speed increasing control valve V ₄ in the second stage movement, the boom control valve V ₈ is moved around the vertical axis in a position that is offset to one side. The arm operation rod 36a is relatively rotatably connected to the arm link 36 by pushing or pulling the arm in the first step, and only the arm control valve _V3 is moved in the second step. The speed control valve _V9 can also be operated.
The arm control valve V ₃ is pivotally connected to be relatively rotatable around the vertical axis at an offset position, and is further provided with a guide 37 for receiving and guiding both links 35 and 36. And the valve connection arm 27B,
28B, 29B, and 30B, respectively, to the boom operating rod 35a, the bucket control valve _V7 operating rod _L7 , the arm operating rod 36a, and the swivel base control valve _V2 operating rod _L2. for,
By swinging back and forth, each rod 35a... is pivotally connected so that it can be pushed or pulled.
The boom 9, the arm 11, the bucket 13, and the swivel base 2 can be operated using working levers 23 and 26.

The base cylindrical bodies 38a, 38a of the left and right pair of steering levers 38, 38 are supported by a horizontal shaft 39 on the swivel base 2.
The respective cylindrical bodies 38a,
Arms 40, 40 protruding from 38a are pivotally connected to operating rods _L1 and _L6 of travel valves _V1 and _V6 so that they can be pushed and pulled by swinging back and forth. be.

Base cylindrical body 41a of merging valve operating pedal 41
is fitted onto the horizontal shaft 42 of the swivel base 2 so as to be relatively rotatable, and the arm 43 protruding from the base cylindrical body 41a is connected to the rod 44 and the swinging relay link 4.
5 to the operating rod L ₅ of the merging valve V ₅ ,
They are interlocked and connected so that they can be pushed and pulled by swinging back and forth, and can be switched to a high-speed drive state by depressing the pedal 41, and to a low-speed drive state by releasing the pedal 41. It is structured as follows.

The base cylindrical body 46a of the service control valve operating pedal 46 is fitted onto the horizontal shaft 47 supported on the swivel base 2 so as to be relatively rotatable, and the arm 46b protruding from the cylindrical body 46a is connected to the service control valve V. ₅ operation rod L ₁₀
The service port 1
Various attachment devices connected to 8 and 18,
It is configured so that it can be activated by operating a pedal 46.

The base cylindrical bodies 48a and 49a of the bracket operating lever 48 and the earth removal plate operating lever 49 are fitted around the horizontal shaft 50 supported on the swivel base 2 so as to be relatively rotatable, and each cylindrical body 48a , 49a, respectively, to the operating rod L _{11 of the control valve V 11 for} the bracket and the operating rod L ₁₂ of the control valve V ₁₂ for the earth removal plate. They are interlocked and connected so that they can be pushed and pulled by movement. In addition, the base cylindrical body 5 of the accelerator lever 53
3a is externally fitted onto the horizontal shaft 50 so as to be swingable back and forth.

As shown in FIGS. 3, 5, and 6, the arm link 36 and the valve operating link L ₉ are connected to prevent the arm speed increasing control valve V ₉ from being operated.
A swing type locking arm 54 that removably engages with a pivot connecting pin 55 is attached to the lower end of a vertical shaft 57 that is rotatably supported on a bracket 56 attached to the swivel base 2 so as to rotate integrally therewith. It is fitted externally. and,
A push-pull type operating lever 58 for pushing and pulling the locking arm 54 is penetrated by its rod portion 58b through a lever insertion hole 20c formed in the front cover portion 20a of the cover body 20, and An operating lever 58 is pivotally connected to a swinging arm 59 attached to the upper end of the vertical shaft 57 so as to rotate integrally therewith. Also,
Between the base of the swing arm 59 and the bracket 56,
In order to maintain the position of the locking arm 54, disc springs 62, 62 which provide frictional resistance are interposed, so that the operation of the arm speed increasing control valve _V9 can be checked.

In short, as mentioned above, the traveling crawlers 1a, 1
When escaping from a state where b has entered a depression, the advancement resistance may be large and the arm 11 may not operate despite the supply of pressure oil.In such a case, the arm speed increase control If valve V ₉ is also operated to the arm operating state,
Since the drain oil flow from the control valve _V6 to the right traveling crawler 1b is blocked, there is a danger that only the left traveling crawler 1a will be driven. Control valve V ₉
The above-mentioned danger can be avoided by preventing the controller from being operated from a neutral state.

On the operating lever 58, a lever grip portion 58a, which also serves as a restriction device 61 that restricts the pushing movement range by contact with the front cover portion 20a, is removably screwed onto the end of the rod portion 58b. There is. In other words, the lever grip portion 58a of this operating lever 58
The diameter of the lever insertion hole 20c is larger than that of the lever insertion hole 20c formed in the front cover portion 20a.

Therefore, when the lever grip portion 58a is attached to the rod portion 58b, the movement limit of the operating lever 58 in the pushing direction is limited by the presence of the front cover portion 20a. When the grip portion 58a is removed, the rod portion 58b of the operating lever 58
The lever can be switched to a retracted state within the cover body 20 via a lever insertion hole 20c formed in the front cover portion 20a. In addition, in the retired state, the operating lever 58 is moved to the front cover portion 20a.
In order to maintain the posture facing the lever insertion hole 59, the plate-shaped holder 60 that fits and holds the retracted rod body 58b is attached to the right stand 19.
It is installed on.

In short, the work of assembling and disassembling the cover body 20 is
The operation lever 58 prevents the operation from becoming complicated and allows for easy operation.

In carrying out the present invention, the structure in which the operating lever 58 is attached so as to be switchable between the protruding state and the retracted state is such that, for example, as shown in FIG. For example, the beta pin 61, which serves as a regulating device for regulating
Various changes can be made depending on the specific structure of the operating lever 58.

Further, the holder 60 may be formed in the shape of an upward opening into which the operating lever 58 is inserted and held from above.

In addition, the present invention can be used not only to check the speed increasing drive of the arm 11, but also to check the operation of various valves, for example, to check the speed increasing drive of the boom 19. .

In addition, in place of the backhoe device 6, the present invention uses a shovel work vehicle equipped with various shovel work devices such as a face shovel device, and traveling crawlers 1a, 1.
Instead of b, it can be applied to a shovel vehicle equipped with multiple wheels.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

Fig. 1 is a side view of the backhoe work vehicle, Fig. 2 is a hydraulic circuit diagram, Fig. 3 is a schematic plan view of the driver's seat attachment part, Fig. 4 is a partially cutaway perspective view of the cover body attachment part, and Fig. 5 The figure is a partially expanded plan view of the valve operation structure, No. 6
The figure is a developed vertical side view of the locking arm attachment part, and FIG. 7 is a plan view of another embodiment. 1a, 1b... traveling device, 4... driver's seat, 6...
...Shovel working device, 19,19...Stand for mounting operation lever, 20...Cover body, 20a...
Front cover part, 20b...Rear cover part, 20c
... Insertion hole, 58 ... Operation lever, 58a ... Grip section, 58b ... Rod body section, 60 ... Holder, 61
...Regulatory equipment.

Claims (1)

[Scope of utility model registration request] A cover body 20 integrally formed with a front cover portion 20a in an upright position and an upper cover portion 20b in a substantially horizontal position is attached to the machine base so as to be freely openable upwards, and is covered with the cover body 20. In a work vehicle equipped with an operating lever 58 connected to an internal device at a location, an insertion hole 20c is formed in the front cover portion 20a of the cover body 20, and the operating lever 58 is disposed in a posture penetrating the insertion hole 20c. and linking an end side of the operating lever 58 inside the cover body 20 with the internal device,
The operating lever 58 is configured to be able to be pushed and pulled freely in the rod direction of the rod portion 58b of the operating lever 58 inserted into the insertion hole 20c, and the operating lever 58 is provided with a front cover of the cover body 20. part 2
A restrictor 61 that defines the operating limit of the operating lever 58 in the pushing direction by contact with 0a.
is configured such that the control lever 58 can be inserted into the inside of the cover body 20 in its entirety when the restricting tool 61 is released from the contact, and further, The machine base portion is arranged such that the grip operation side end of the operation lever 58 is located inside the cover body 20 in the closed position and near the insertion hole 20c of the front cover portion 20a. A work vehicle characterized by being provided with a holder 60 that locks the rod portion 58b of the lever 58 to maintain its posture.