JPH0774008B2 - Operating device for traveling vehicle - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating device for operating a traveling vehicle equipped with traveling devices which are independently driven by hydraulic pressure by one operating lever.

[0002]

2. Description of the Related Art Conventionally, an operation lever of this type is steered left and right by horizontally rotating a handle at the upper end of the operation lever, and is moved forward and backward by swinging the operation lever back and forth. Although it was provided so that the speed can be increased by making a large movement, the swing operation before and after this was provided so as to swing in a plane vertical to the floor surface of the vehicle.

[0003]

When the vehicle travels across the inclined surface, the driver keeps the body in a vertical posture even if the vehicle leans to the left or right. In addition, the operating lever tilted to the left in both vehicles, and the handle at the upper end of the operating lever moved to the left side of the body, making it difficult to operate with the driver's right hand.

[0004]

According to the present invention, an operating lever is pivotally mounted so as to be swingable in the left-right direction and lockable at a predetermined swing position. That is, when traveling on a slope descending to the left, by locking the operation lever at the position swung to the right, it becomes easy to grasp the handle with the right hand even if the body is kept in a vertical posture. Is.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

Crawler-type left and right traveling devices 5 and 5'are mounted on both sides of a vehicle body 3 on which the engine 1 is mounted, a mowing device 7 is provided at a front portion so as to be able to move up and down, and a tread plate 9 is provided at a rear portion.
An operating device 11 and a handle 13 for a handrail are provided.

The operating device 11 is constructed as follows. A support shaft 19 is laterally fixed to the mounting frame 15 by left and right side plates 17 and 17 ', and a cylindrical portion 2 is fixed to the lower end of the operation lever 23 in the center through a bearing 21.
5 is fitted. The operation lever 23 has a handle 29 having a switch 27 for switching an electromagnetic valve (not shown) for moving the mowing device 7 up and down at one end surface thereof, and the handle 29 having a vertical operation pipe 3
1 is fixed in a horizontal posture in the left-right direction via a bracket 33. The operation tube 31 is rotatably vertically supported by a support cylinder 37 via a bearing 35, and arms 39 and 39 'protruding laterally are fixed.

The support tube 37 has a lower end fixed to the upper end of a lever portion 41 fixed to the cylindrical portion 25, and is a horizontal cylindrical body 4 in the front-rear direction.
3 has a shaft 4 rotatably supported by a bearing 45.
It is fixed to the end of 7. A locking plate 49 that is orthogonal to the axial center line is fixed to the lower part of the cylindrical body 43, and a locking pin 53 that can be retracted and retracted is removably locked to a bracket 51 that projects downward from the support cylinder 37. The holes 55, 55 ... Are provided on a concentric circle centered on the axis of the cylindrical body 43. Below the handle 29, a connecting rod 59, which secures a handle 57 parallel to the handle 29 to the upper end, penetrates inside the operation pipe 31, and the lower end interlocks with the locking pin 53 via an L-shaped link 61. Then
By pulling up the handle 57 with the finger of the operator who holds the handle 29, the locking pin 53 is disengaged from the locking hole 55, and the handle 57 is appropriately tilted right and left about the shaft 47. When released, the locking pin 53 is engaged with the locking hole 55 by the bullet 63 and the supporting cylinder 37 and the cylindrical body 43
Are fixed to each other.

A left lever cylinder 67 and a braking cylinder 69, which are fixed to the lower end of the left lever 65 adjacent to both sides of the cylinder portion 25, are fitted to the shaft 19, and the right lever 65 'of the right lever 65' is adjacent to the right side of the braking cylinder 69. A right lever cylinder 67 'whose bottom end is fixed is fitted. Between the left lever cylinder 67 and the left side plate 17 and the right lever cylinder 67 '
A friction plate 71 is provided between the right side plate 17 'and the right side plate 17'. The shaft 19 rotatably holds the lever cylinders 67, 67 ', the cylinder portion 25, and the braking cylinder 69 by a flange 73 at one end and a bolt 75 screwed into the other end. The upper ends of the left and right levers 65, 65 'are connected by the left and right rods 79, 79' via the universal joint 77, respectively.

Horizontal arms 81 and 81 'are fixed to the left and right lever cylinders 67 and 67', respectively, and free joints 8 are provided at both ends.
The left and right rods 85 and 85 'provided with 3 are connected to the respective operation arms 89 and 89' of the left and right variable displacement hydraulic pumps 87 and 87 '. Hydraulic pump 87,87
′ Communicates with the left and right hydraulic motors (not shown) that drive the left and right traveling devices 5 and 5 ′ independently, and when the operation arms 89 and 89 ′ are swung upward from the horizontal neutral position, the hydraulic motors are driven. Is rotated in the forward direction and oscillated downward, the hydraulic motor is rotated in the backward direction, and the forward and backward velocities increase as the operating arms 87 and 87 'swing up and down. Is provided.
Since the hydraulic pump and the hydraulic motor are the same as those usually used, detailed description thereof will be omitted here.

The braking device 91 is constructed as follows. The left end of the braking cylinder 69 rotatably abuts the cylinder portion 25 via the washer 93, and the cam cylinder 95 is rotatably fitted to the inner diameter of the right end. The cam barrel 95 engages with a pin 97 penetrating the shaft 19 through a long hole 99, and has four cam surfaces 101 on its inner end surface. The brake cylinder 69 has a cam cylinder 95.
A large-diameter portion 103 on the right side and a small-diameter portion 105 fitted to the outer periphery of the shaft 19 are formed, and four balls 109 are rotatably provided in four holes 107 that penetrate the small-diameter portion 105 in the axial direction. It fits, abuts on the outer peripheral surface of the shaft 19 and the cam surface 101, and rolls. The arm 1 fixed to the lower surface of the outer periphery of the braking cylinder 69
The other end of the wire 113 connecting one end to 11 is connected to the pedal 115 on the tread 9. The other end of the bullet 119, one end of which is locked to the arm 117 fixed to the upper surface of the outer periphery of the braking cylinder 69, is locked to the mounting frame 15 and urges the wire 113 in the direction to pull it back.

Horizontal spring arms 121 and 121 'are fixed to the left and right lever cylinders 67 and 67', respectively, and are pivotally attached to the lower ends of spring rods 123 and 123 '.
The washer 12 is fixed to the spring rods 123 and 123 '.
5, the upper and lower springs 127 and 129 are fitted, and the upper and lower end surfaces are locked by the U-shaped support metal fittings 131 and 131 'through which the spring rods 123 and 123' penetrate vertically, respectively. The levers 65 and 65 'are biased in the direction of returning to the neutral position. Support bracket 131
Are fixed to the stay 133 fixed to the mounting frame 15 with bolts 135.

A shock absorber 139 is pivotally attached to the mounting frame 15 by a shaft 137, and a lower end thereof is pivotally attached to a buffer arm 141 horizontally fixed to the tubular portion 25 by a shaft 143.

A swing plate 149 is pivotally attached to a bracket 145 fixed to the upper portion of the mounting frame 15 by a shaft 147 so that the swing plate 149 can swing up and down, and left and right locking holes 151 provided at the front end portions.
151 'releasably engages with locking pins 153, 153 projecting from the upper ends of the left and right levers 65, 65' to lock the lever portions 65, 65 'in the neutral position. The rocking plate 149 is provided so as to be urged upward and downward when the rocking neutral position is exceeded by a bullet 155 whose both ends are locked to the bracket 145. Further, the upward swing position is regulated by an adjusting screw 157 so as to be adjustable. A handle 159 is fixed to the swing plate 149.

In the above structure, when the vehicle is traveling, the engine 1 is started to drive the hydraulic pumps 87, 87 '. The operation lever 23 returns to the neutral position with the hand released. When the operator stands on the footboard 9, holds the handle 13 with his left hand, grasps the handle 29 of the operating lever 23 with his right hand, and gradually tilts it forward, the rod 7
9, 79 ', levers 65, 65', arms 81, 81
', The left and right operation arms 8 via the rods 85, 85'
9, 89 'simultaneously rotate upward, the left and right hydraulic motors (not shown) simultaneously rotate, and the left and right traveling devices 5, 5'
Starts to rotate at the same speed and the vehicle starts to go straight ahead.
When the operating lever 23 is gradually and largely tilted forward, the swing of the operating arms 89, 89 'is increased, the discharge amount of the hydraulic pump is increased, the rotational speed of the hydraulic motor is increased, and the traveling speed of the vehicle is increased. . To turn the vehicle, for example, when turning to the right, when the handle 29 is turned to the right (clockwise) at the position of the operation lever 23 for forward traveling, the left arm 39 swings forward. Then, the right arm 39 'pivots backward. Therefore, the left hydraulic pump 8
The discharge amount of 7 increases and the speed of the left traveling device 5 increases, while the discharge amount of the right hydraulic pump 87 ′ decreases and the speed of the right traveling device 5 ′ decreases and the vehicle 1 moves to the right. Turn in the direction.

When the handle 29 is released, the left spring 12
7, 129 and the right springs 127 ', 129' return the left and right levers 65, 65 'to the neutral position, and the vehicle goes straight and stops. Further, in order to keep the traveling state such as straight traveling, the pedal 1 is depressed when the pedal 115 is depressed.
The braking cylinder 69 rotates against 19 and the ball 109 moves to the cam surface 1
Since it rotates on 01, it pushes the washer 93 and the cam barrel 95 in a direction away from each other, and the left and right lever barrels 67, 6
The friction plates 71, 71 'are pressed between the 7'and the left and right side plates 17, 17' to brake the lever cylinders 67, 67 ', so that the operation state of the operation lever 23 is maintained. In this operating state, when the foot is released from the pedal 115, the bullet 119 rotates the braking cylinder 69 in the opposite direction to release the braking.

When the vehicle 1 is not used, the handle 15
When 9 is pushed down, the rocking plate 149 descends and the locking pins 153 at the upper ends of the left and right levers 65, 65 'in the neutral position.
To engage the locking hole 151 of the rocking plate 149 with the lever 65,
Lock 65 '. Lifting the handle 159 unlocks the levers 65, 65 '.

When the vehicle 1 travels along an inclined surface that inclines to the left and right, for example, when traveling on an inclined surface that descends to the left, with the finger of the right hand holding the handle 29, the handle 5
When 7 is pulled up, the locking pin 53 separates from the locking hole 55 of the locking plate 49 via the link 61. Operation tube 31 is axis 4
When the handle 57 is released at a position where the handle 57 is rotated to the right and has a vertical posture around the center, the handle 5 is moved by the bullet 63 and gravity.
7, the locking pin 53 is locked in the locking hole 55, the operation tube 31 is held in a vertical posture with respect to the left and right, and approaches the right hand position of the operator standing vertically on the step board 9 to approach the handle. Two
Since 9 is located, the operation becomes easy.

To raise and lower the working device (mowing device in this embodiment) 7 during traveling, the solenoid valve (not shown) is switched by switching the switch 27 and the hydraulic cylinder (not shown) is used. Since the mowing device 7 moves up and down, the lifting device for the working device during traveling becomes easy.

The present invention is not limited to the above-mentioned embodiment, and for example, (1) the traveling device may be a wheel type. (2) The braking system is not limited to the cam, and other means such as a disc brake, a locking projection, or a ratchet system may be used.
(3) Braking is not limited to pedals, and may be manual or electric.
(4) The locking pin 53 that engages with the locking plate 49 may be directly operated by providing a knob portion directly on the locking pin 53 without operating the grip 57.

If only the operation lever 23 is braked so that the left and right levers 65 and 65 'are not rocked (that is, only the cylinder portion 25 is braked and the left and right lever cylinders 67 are braked). , 67 'can be turned while maintaining a constant traveling speed (without braking).

[0022]

According to the present invention, when traveling on an inclined surface which is inclined in the left-right direction, the handle at the upper end of the operating lever can be grasped and operated by rocking and locking the operating lever to the mountain side. It will be easy.

[Brief description of drawings]

FIG. 1 is a front view of an operating device of the present invention.

FIG. 2 is a side sectional view of a main part.

FIG. 3 is a front sectional view of a braking device.

FIG. 4 is a front sectional view (a), a plane sectional view (b), and a side sectional view (c) of the same main portion.

FIG. 5 is a side sectional view of an operating mechanism of the braking device.

FIG. 6 is a plan view of a lever locking mechanism.

FIG. 7 is a side view of a vehicle equipped with the device according to the present invention.

[Explanation of symbols]

 23 operation lever 29 handle 57 handle

Claims (2)

[Claims] 1. In a vehicle equipped with a traveling device that is hydraulically driven independently on the left and right sides, a lever portion 41 is connected to a central cylinder portion 25 fitted to a support shaft 19 arranged horizontally on the left and right sides. Pivot around the center line of the horizontal axis 47,
In addition, a support cylinder 37 is provided at the rotation position so that it can be locked, and the operation lever 23 is fitted into the support cylinder 37.
3 is rotated around the support shaft 37 together with the support cylinder 37 and the lever portion 41 to swing the operation lever 23 in the front-rear direction to adjust the speed, and the operation lever 23 is rotated about the center line of the support cylinder 37. The steering lever is adjusted by adjusting the steering.
An operating device for a traveling vehicle, characterized in that the operation is controlled together with the support cylinder 37 by rotating the operation lever 23 in the left-right direction by rotating the operation lever 23 around the center line of the shaft 47. 2. A handle 57 for engaging and disengaging a locking device that locks the operating lever 23 at a predetermined swing position in the left-right direction is close to a handle 29 provided at the upper end of the operating lever 23. The operating device for a traveling vehicle according to claim 1, further provided.