JP3561442B2 - Work vehicle control device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a control device for a work vehicle such as a backhoe.
[0002]
[Prior art]
A conventional backhoe steering device is disclosed in Japanese Patent Application Laid-Open No. H10-140614. The control device includes a `` fixed frame fixed to a body of the work machine, which is disposed beside a driver's seat of the work machine, and supported by the fixed frame so as to be rotatable between a use position and a flip-up position. A console box having a rotating frame, and a changeover switch for switching the working machine between an activated state and a stopped state, wherein the rotating frame is used between the fixed frame and the rotating frame. A first locking mechanism that removably locks the rotating frame at a position and a second locking mechanism that removably locks the rotating frame at a flipped-up position, wherein the work machine is provided with the first locking mechanism. Switching of the changeover switch in conjunction with disengagement of the first locking mechanism so that the switching mechanism can be switched between an activated state and a stopped state in accordance with the locked state and the released state of the locking mechanism. Equipment To have.
[0003]
The first locking mechanism pivotally supports a rotation link integrally fixed with a rotation lever on a rotation frame, and engages an engagement shaft provided on the fixed frame with a guide groove of the rotation link. The changeover switch is provided on the fixed frame, and is operated by rotation of the rotation link.
In the above-mentioned switch switching device, `` in order to prevent the work machine such as the excavator from suddenly stopping or starting, the console box is inadvertently moved from the use position to the jumping position or from the flipping position to the use position. Is prevented from rotating. "
[0004]
[Problems to be solved by the invention]
In the prior art, the changeover switch is provided on the fixed frame, and the rotation link provided on the rotation frame is configured to rotate to operate the changeover switch. Not only the tolerance of itself but also the tolerance of the pivot of the rotating frame is added, bending and backlash increase, and the changeover switch causes micro vibration near the switching on and off, and the changeover switch is operated later or breaks down And its reliability and durability are low.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a control device for a working vehicle which can solve such a problem of the conventional technology.
The present invention provides a control device for a work vehicle, in which a changeover switch is mounted on a rotating frame and operated by a switching operation member mounted on the same rotating frame, thereby enabling a proper operation with a reduced tolerance. The purpose is to:
[0006]
[Means for Solving the Problems]
A first specific means for solving the problem in the present invention is that the rotating frame 34 supporting the operation lever 30 is provided on the fixed frame 40 arranged on the side of the driver's seat 8 between the use position and the flip-up position. Between the switching operation member 57 and the fixed frame 40 pivotally supported by the rotation frame 34, the rotation frame 34 is flipped up to the use position by the rotation operation of the switching operation member 57. A position setting mechanism 58 for rotating and holding the work vehicle 1 is provided, and a switch 54 for switching the work vehicle 1 between a work enable state and a work stop state by operating a switching operation member 57 is provided on the rotation frame 34. That is.
[0007]
Thus, the tolerance between the changeover switch 54 and the changeover operation member 57 is reduced, and the changeover switch 54 can be properly operated.
The second specific means for solving the problem in the present invention is, in addition to the first specific means, a restriction on the rotation of the switching operation member 57 that enables the work vehicle 1 to be in a workable state on the rotating frame 34. A stopper 59 is provided, and the changeover switch 54 is provided on the stopper 59.
Thus, the rotation of the switching operation member 57 is restricted by the stopper 59 to prevent a micro vibration or an excessive force from being applied to the switching switch 54, and the stopper 59 is used as a mounting bracket of the switching switch 54.
[0008]
A third specific means for solving the problem in the present invention is that, in addition to the second specific means, a support cylinder 44 is provided on the fixed frame 40, and a switching operation member is provided on the support cylinder 44 via a pivot 45. The boss portion 46 is provided at the center of rotation of 57, and the boss portion 46 is provided with an operating member 55 capable of contacting the stopper 59 and the changeover switch 54.
Accordingly, the operation member 55 can be firmly attached, and the rotation and vibration of the switching operation member 57 are reliably restricted by contacting the stopper 59.
[0009]
A fourth specific means for solving the problem in the present invention is that, in addition to any one of the first to third specific means, the rotating frame 34 is covered with a cover body 35, and That is, the changeover switch 54 is provided.
This prevents the changeover switch 54 from getting wet with rainwater.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
2, 3 and 8, reference numeral 1 denotes a backhoe exemplified as a work vehicle, and the backhoe 1 is mainly composed of an upper swing body 2 and a lower traveling device 3.
The traveling device 3 includes a pair of left and right traveling members 4 of a rubber crawler type driven by a hydraulic motor, and a dozer 5 at a front portion.
The revolving unit 2 includes a revolving base 6 supported on a traveling device 3 so as to be revolvable left and right about an axis in a vertical direction, a working device (excavating device) 7 provided in front of the revolving platform 6, and a revolving platform. 6 and a driver's seat 8 and the like.
[0011]
A rear portion of the swivel base 6 has a counterweight 9 for balancing weight with the working device 7 and the like. An engine 61, a radiator 62, a hydraulic pump 63, an air cleaner 67 and the like are arranged at a rear side of the swivel base 6. These are covered by a bonnet 11 whose front upper part is pivotally supported.
A hydraulic oil tank 64 for storing hydraulic oil of a hydraulic device, a control valve 65 for controlling the hydraulic device, and the like are disposed on the right side of the swivel 6. These components are covered by a tank cover 12.
[0012]
The tank cover 12 has a front lower end pivotally attached to the revolving base 6 by a hinge 66 so as to be rotatable around a left-right axis. The tank cover 12 is turned upward and forward about the hinge 66 as a fulcrum. Thus, the arrangement space for the hydraulic oil tank 64 and the like is configured to be open.
A support bracket 13 is provided at a front portion of the swivel 6, and a swing bracket 14 is supported on the support bracket 13 so as to be able to swing left and right around a vertical axis.
[0013]
The working device 7 includes a boom 15 whose base portion is swingably supported by the swing bracket 14, an arm 16 whose base portion is swingably supported by the distal end of the boom 15, and A bucket 17 supported so as to be able to perform a dump operation, and can be operated by a boom cylinder 18, an arm cylinder 19, and a bucket cylinder 20 each composed of a hydraulic cylinder.
As shown in FIGS. 2 to 4, the driver's seat 8 is disposed on the front side of the hood 11 and on the left side of the tank cover 12, and is detachably mounted on the seat support 23.
[0014]
The seat support 23 includes a pair of left and right side plates 24L and 24R connected to each other, and the lower ends of the left and right side plates 24L and 24R are detachably attached to an attachment member 25 provided on the swivel 6 by bolts or the like. By being fixed, the seat support 23 is detachably attached to the swivel 6.
In front of the driver's seat 8, driving control levers 21 L, 21 R provided in a pair on the left and right sides for separately operating the left and right traveling bodies 4 are arranged, and control tables 22 L, 22 R are provided on both left and right sides of the driver's seat 8. The left and right control tables (control devices) 22L and 22R are detachably mounted and fixed to the seat support 23.
[0015]
Further, the left control table 22L is rotatable upward (upward) around a left-right axis about a rotation support point on the rear side. This is because the left side of the driver's seat 8 (diagonally left front side of the driver's seat 8, that is, the front side of the left control table 22L) is the entrance 32, and the left control table 22L is turned so as not to disturb the getting on and off. By rotating upward about the pivot point, the entrance 32 can be retracted so as to widen it.
In addition, the entrance 32 is not limited to the left side of the driver's seat 8, and the tank cover 12 is arranged on the left side, and when the driver's seat 8 is arranged on the right side, the right side of the driver's seat 8 is set as the entrance, When there is no obstacle such as the tank cover 12 on the side of the driver's seat 8, one or both sides of the driver's seat 8 may be used as the entrance. In the present embodiment, it is possible to get on and off through the front side of the tank cover 12.
[0016]
On the right control table 22R, there are provided a boom / bucket operation lever 26 for operating the boom 15 and the bucket 17, a dozer operation lever 27 for operating the dozer 5, an accelerator lever 28 for controlling engine rotation, and a lock lever. 29, the lock lever 29 is operated to operate the unload valve, and the operation of the boom 15 and the bucket 17 by the boom / bucket operation lever 26 is disabled or enabled.
The left control table 22L is provided with a rotation motor for rotating the rotation table 6, a rotation / arm operation lever 30 for operating the arm 16, and a lock lever 31. The lock lever 31 is operated by operating the lock lever 31. The upward rotation of the left control table 22L is released or restricted, and the operation of the turning motor and the arm 16 by the turning / arm operation lever 30 is disabled or enabled.
[0017]
As shown in FIGS. 1 and 4 to 7, the left control table 22 </ b> L includes a rotating frame 34 attached to and supported by the seat support 23 and upper and lower cover bodies 35 and 36 that cover the rotating frame 34. , Formed in a hollow shape.
The turning frame 34 is mainly composed of a pair of left and right support brackets 37L, 37R and front and rear mounting members 38, 39 arranged between the left and right support brackets 37L, 37R to connect them together. The upper and lower cover members 35, 36 are detachably attached to the attachment members 38, 39.
[0018]
Further, a pilot valve 33 for controlling a hydraulic motor for driving the swivel table 6 and a control valve for the arm cylinder 19 is mounted and supported on the front mounting member 38, and the operation for the swivel / arm is performed so as to operate the pilot valve 33. A lever 30 is supported.
On the left side of the upper side of the left side plate 24L of the seat support 23, a fixed frame 40 is arranged to be opposed to and fixedly connected to the side plate 24L. A cylindrical body 41 having an axis is fixed. A support shaft 42 having a left-right axis is inserted through the cylindrical body 41 in a protruding leftward direction and is supported at the rear lower part of the right support bracket 37R of the left control table 22L. 43 is penetrated in the left-right direction and is fixed. The boss 43 is externally fitted to the left side of the support shaft 42 so as to be rotatable around the axis. Therefore, the support shaft 42 is a rotation fulcrum of the left control table 22L and a rotation fulcrum of the rotation frame 34.
[0019]
In the middle of the right support bracket 37R, a support tube 44 having an axis in the left-right direction penetrates the bracket 37R and is fixed. A pivot 45 is rotatable around the axis of the support tube 44. It is inserted and supported.
A boss 46 provided at the base of the lock lever 31 is fixed to the left side of the pivot 45, and a base of a cam body 47 is fixed to the right side of the pivot 45, and the lock lever 31, the cam body 47 and the pivot 45 are supported so as to be integrally rotatable around the axis of the support cylinder 44, and these constitute a switching operation member 57.
[0020]
A cam groove 48 is formed in the cam body 47 from the base side to the front end. The cam groove 48 is formed with a first cam groove 48A formed on the base side and a second cam groove 48A extending from the first cam groove 48A to the front end side. And a cam groove 48B.
The first cam groove 48A is formed in an arc shape about the axis of the pivot 45, and the second cam groove 48B rotates the lock lever 31 from the position shown by the solid line in FIG. Are formed so as to have an arc shape centered on the axis of the support shaft 42.
[0021]
At the use position of the left control table 22L, the lock lever 31 extends in a tilt direction in which the lock lever 31 shifts rearward as it goes downward from the boss portion 46 as shown by a solid line in FIG. And protrudes out of the left control table 22L from an opening 50 formed in the lower cover body 36.
After that, the lock lever 31 is bent so as to be directed in an inclined direction which moves upward as it goes forward, and further bent in such a direction as to move upward as it goes forward.
[0022]
The opening 50 is formed so as to extend from the lower surface side of the lower cover body 36 to the upper front surface side.
A guide pin 51 having a left-right axis is fixed to the fixed frame 40. A roller 51a is fitted around the guide pin 51 so as to be rotatable around the axis. Are inserted through the cam groove 48.
A return spring 52 is interposed between the lock lever 31 and the rear mounting member 39, and the lock lever 31 is urged by the return spring 52 in a downward direction (counterclockwise in FIG. 5). .
[0023]
A position setting mechanism 58 is constituted by the switching operation member 57, the cam groove 48, the guide pin 51, the roller 51a, the return spring 52, and the like.
Further, a gas spring 53 is interposed between the fixed frame 40 and the right support bracket 37R, and a limit switch (switching switch) 54 is provided on the rotating frame 34 via a stopper 59 so that the lock lever 31 The boss portion 46 is provided with an operating member 55 that comes into contact with a contact of the limit switch 54.
The changeover switch 54 is connected to an electromagnetic switching type unload valve 60. The state in which the operating member 55 is in contact is the unload off state, and when the operation member 55 is separated, the unload valve 60 is switched on.
[0024]
The unload valve 60 is connected to a pilot hydraulic operating system, and when turned on, unloads the pilot hydraulic operating system, and turns to the traveling device 3, the turning motor of the swivel 6, the hydraulic cylinder of the excavating device 7, and the like. The supply of pressure oil is stopped. The unload valve 60 may be of a manual switching type, and the on / off switching operation may be performed by transmitting the contact and separation of the operating member 55 by a push-pull cable.
The stopper 59 is formed by bending a plate material into an L-shape when viewed from the rear and fixed to the mounting member 38. The lower end of the stopper 59 can contact the operating member 55, and the limit switch 54 is pressed by the operating member 55, and the stopper 59 is unlocked. Immediately after the load valve 60 is switched from on to off, the stopper 59 contacts the operating member 55 so that the operating member 55 does not press the limit switch 54 any more.
[0025]
The stopper 59 has a function of attaching the limit switch 54 and restricting the rotation of the operation member 55, and may be formed of a flat plate. The mounting position of the limit switch 54 with respect to the stopper 59 may be adjustable.
When the operating member 55 comes into contact with the stopper 59, the lock lever 31 may be turned from the flipped-up state in FIG. 1 to the use state in FIG. 5, and a further counterclockwise force may be applied at the stroke end. Even so, the rotation of the lock lever 31 is restricted, and the fine vibration of the lock lever 31 is limited, thereby preventing the limit switch 54 from being repeatedly turned on and off or being pushed and damaged.
[0026]
The operating member 55 is formed of a plate material, and is firmly fixed to the boss portion 46 of the lock lever 31 so as to protrude radially outward. Further, the limit switch 54 is located inside the upper and lower cover members 35 and 36 so as not to be exposed to rainwater.
In the above-described configuration, the left control table 22L is in a use position where the operation is performed in the backhoe 1 in a state indicated by a solid line in FIG. 5, and in this position, the support cylinder 44 is attached to the contact member 56 provided on the fixed frame 40. By the contact, the downward rotation of the rotating frame 34 around the support shaft 42 is restricted, and the left control table 22L is held at the use position.
[0027]
In the use position, the guide pin 51 is located at the base end of the first cam groove 48A, and the rotation of the lock lever 31 in the counterclockwise direction in FIG. The rotation of the frame 34 (the left control table 22L) around the support shaft 42 (in particular, the upward rotation) is restricted.
In this use position, the operating member 55 is appropriately in contact with the contact of the limit switch 54 in a state of contact with the stopper 59. In this state, the unload valve 60 is off, and the turning / arm operating lever By operating 30, the swivel 6 and the arm 16 can be operated.
[0028]
When the lock lever 31 is pulled up from this use position to a position shown by a virtual line as shown in FIG. 5, the cam body 47 rotates clockwise in FIG. 5, and the guide pin 51 relatively moves to the first cam groove. It is located at the intersection of 48A and the second cam groove 48B.
In this state, as described above, since the second cam groove 48B is located on the circular arc locus centered on the axis of the support shaft 42, the upward rotation of the rotation frame 34 around the support shaft 42 is allowed. You.
Further, the operating member 55 is separated from the contact of the limit switch 54, and switches the unload valve 60 from the off state to the on state. Due to the ON state of the unload valve 60, even if the swing / arm operation lever 30 is operated, the swivel 6 and the arm 16 cannot be operated.
[0029]
When the lock lever 31 is further pulled up from the above state, as shown in FIG. 1, the rotating frame 34 is flipped upward around the support shaft 42 and rotated until the gas spring 53 is in the maximum extended state, and the entrance 32 22L is retracted so as to widen the distance.
In this retracted position, a portion 31a of the lock lever 31 corresponding to the left control table 22L in the front-rear direction is accommodated in the left control table 22L (the lower cover body 36) via the opening 50, and the lock lever 31 The guide pin 51 restricts the rotation of the support cylinder 44 about the axis.
[0030]
In the retracted position, the portion 31a of the lock lever 31 corresponding to the left control stand 22L in the front-rear direction does not have to be completely retracted rearward from the outer edge of the left control stand 22L, and does not interfere with getting on and off. If it is to the extent, it may be slightly protruded from the outer edge of the left control platform 22L.
To move the left control table 22L from the retracted position to the use position, the left control table 22L may be turned in the opposite direction to the above, against the urging force of the gas spring 53.
[0031]
In the above embodiment, since the switching operation member 57 is pivotally supported and the switch 54 is provided on the rotating frame 34 pivotally supported by the fixed frame 40, the switching switch 54 is provided on the fixed frame 40. , The tolerance between the changeover switch 54 and the changeover operation member 57 is reduced, the bending and the play are reduced, the changeover switch 54 can be operated properly, the reliability is improved, and the stopper fixed to the rotating frame 34 is improved. By providing the changeover switch 54 on the changeover switch 59, not only the rotation of the changeover operation member 57 can be restricted, but also it is possible to prevent micro vibration and unreasonable force from being applied to the changeover switch 54. By providing the boss portion 46 of the member 57, the operation member 55 can be firmly attached, and the rotation and vibration of the switching operation member 57 can be reliably regulated. That.
[0032]
Note that the present invention is not limited to the above embodiment, and can be variously modified. For example, the operation member 55 may be attached to the lock lever 31 or the cam body 47, or the changeover switch 54 may be attached to the support bracket 37 or the attachment member 38.
The right operation lever 26 and the left operation lever 30 may operate any of a boom, a bucket, a swing, and an arm, and the combination of the two types of operations can be changed.
[0033]
The operation structure of the unload valve by the operation lever 26 of the right control table 22R can be configured in the same manner as that of the left control table 22L described above.
3 and 8 to 11 show one example of the air bladder structure of the hydraulic oil tank 64. FIG.
The hydraulic oil tank 64 is arranged on the right side of the swivel 6 in front of the hydraulic pump 63 and is covered with the tank cover 12 so that hot air from the engine 61 does not flow to the control valve 65 arranged in front of the tank cover 12. , A tank-shaped partition wall 68 is disposed between the partition wall 68 and the tank cover 12. The partition wall 68 is attached to the hydraulic oil tank 64 via a bracket, and also supports the tank cover 12. Reference numeral 76 denotes a sound absorbing material.
[0034]
A joint base 69 is fixed to the upper part of the hydraulic oil tank 64, a return oil pipe 70 is connected to the joint base 69 via a pipe joint, and a breather pipe 71 is connected to a breather hole 72.
A breather body 73 of the air breather is connected to the tip of the breather pipe 71, is disposed at one upper corner of the hydraulic oil tank 64 remote from the joint base 69, and is provided using a bracket 74 for attaching a partition wall 68. ing.
A switching valve 75 is provided on the joint base 69, and the switching valve 75 and the pipe joint of the return oil pipe 70 are located near the center of the joint base 69. If it is formed in the vicinity, it becomes difficult to attach the blaze body 73.
[0035]
Therefore, the breather body 73 is arranged at one corner of the upper part of the hydraulic oil tank 64 and is connected by a breather pipe 71. Thereby, the breather hole 72 is formed near the center of the hydraulic oil tank 64, and the backhoe 1 is inclined. Even after the oil level hardly spreads on the breather hole 72, the oil overflowing from the breather hole 72 can be stored in the breather body 73 and the breather pipe 71, and the oil level in the hydraulic oil tank 64 is raised to the maximum. Therefore, the amount of oil can be increased.
[0036]
【The invention's effect】
According to the present invention, since the changeover switch 54 is attached to the rotating frame 34 pivotally supporting the changeover operation member 57, the tolerance to the changeover operation member 57 is reduced, and improper operation due to minute vibration and backlash is reduced. However, stable operation can be performed, and the durability of the changeover switch 54 can be improved.
[Brief description of the drawings]
FIG. 1 is a side cross-sectional view of a left control platform in a state in which a flip-up position is set.
FIG. 2 is a side view of the backhoe.
FIG. 3 is a plan view of the swivel base.
FIG. 4 is a front view of a driver's seat and a left and right cockpit.
FIG. 5 is a side cross-sectional view of the left control platform in a use position.
FIG. 6 is a front view of the inside of the left cockpit.
FIG. 7 is a rear cross-sectional view of the inside of the left cockpit.
FIG. 8 is a right side view of the swivel.
FIG. 9 is a plan view showing an air bladder structure of a hydraulic oil tank.
FIG. 10 is a front view of the same.
FIG. 11 is a left side view of the same.
[Explanation of symbols]
1 backhoe (work vehicle)
2 Turning table 8 Driver's seat 22 Control table 35 Cover body 34 Rotating frame 40 Fixed frame 42 Support shaft 44 Support cylinder 45 Axis 54 Limit switch (switching switch)
55 operation member 57 switching operation member 58 position setting mechanism 59 stopper 60 unload valve

Claims (2)

A switching frame that supports an operation lever, is rotatably supported between a use position and a flip-up position on a fixed frame disposed on the side of the driver's seat, and is a switching operation member that is pivotally supported by the rotation frame. A position setting mechanism for rotating and holding the rotating frame between the use position and the flip-up position by rotating the switching operation member between the rotating frame and the fixed frame; A switching switch for switching the work vehicle between a work enable state and a work stop state by a dynamic operation; a stopper for restricting rotation of the switching operation member on the rotating frame; and the switch attached to the stopper; A boss portion at the center of rotation of the switching operation member is rotatably supported on the frame via a pivot, and an operating member is provided on the boss portion, and when the operating member comes into contact with the changeover switch, it acts as a stopper. With this configuration, the work vehicle is switched to the operable state in a state where the rotating frame is in the use position, and the rotation of the switching operation member is regulated in a state in which the work vehicle is in the operable state. steering device for a work vehicle, characterized in that there. The operating device for a work vehicle according to claim 1, wherein the rotating frame is covered with a cover, and the changeover switch is disposed in the cover.

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