JPH07179187A - Working vehicle - Google Patents

Abstract

PURPOSE:To provide a working vehicle capable of executing the intertillage management works in ridged fields, etc., in an easy and efficient manner. CONSTITUTION:A ground work device 2 is arranged before a traveling vehicle 1 provided with a pair of right and left wheels 5, 5, and a driver's seat 53 is arranged rearward of the traveling vehicle 1 in the condition supported on the ground by a grounding body 51. A steering handle 9 provided on the traveling vehicle is constituted in a position switchable manner. i.e., a driving and steering mode where a steering grip part 9a is located in front of the driver's seat 5 and the walking and steering mode where the steering grip part is extended rearward the traveling vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle, and more particularly to a work vehicle for performing management work such as medium tillage work in a ridged field.

[0002]

2. Description of the Related Art Conventionally, as a work vehicle described above, a working device is connected to a walking type traveling body configured to be capable of running in a groove between each ridge, and a worker operates while walking between the grooves. A walk-type management work machine or a riding-type work machine in which a work device is connected to a four-wheeled riding-type traveling machine body and left and right wheels are positioned so as to straddle a ridge while performing work while traveling is used. .

[0003]

The above-mentioned walk-behind work machine has a drawback in that it is necessary to walk for a long time in a narrow ridge that is difficult to walk, and the labor load on the worker is heavy. Although the riding type work machine does not have such a drawback, the size of the machine body becomes large because the boarding operation unit is provided. For example, at the time of turning work on a headland, the turning radius becomes large and the ridge top The wheels run up to the ground, causing the damage such as the damage to the crops planted in the ridges and the collapse of the ridges.
An object of the present invention is to eliminate the above-mentioned inconveniences with a rational configuration.

[0004]

A feature of the present invention is that a ground working device is provided in front of a traveling machine body having a pair of left and right wheels, and is grounded and supported by a grounding body behind the traveling machine body. Along with deploying a driver's seat, the steering handle provided on the traveling body is provided in a riding maneuvering form in which the steering grip is located on the front side of the body with respect to the driver's seat and a walking maneuvering form extending to the rear side of the body. The point is that the posture can be switched.

[0005]

[Operation] When performing management work such as weeding and cultivating work in the ridge while traveling straight in the ridge, the control handle is switched to a configuration in which the control grip is located on the front side of the aircraft with respect to the driver seat, The aircraft can be operated in the riding control mode sitting on it. At this time, the airframe is stably supported by three points of a pair of left and right wheels and a grounding body below the driver's seat. Then, when turning the aircraft at the edge of the ridge to change direction or when traveling over the ridge, the operator pulls down from the driver's seat and switches the steering handle to a configuration in which the steering grip is located on the rear side of the aircraft. Then, the aircraft is operated in a walking control mode. At this time, since the ground work device is located on the front side of the traveling body, that is, on the front side of the wheels, it is possible to push down the steering handle to lift the ground work device in order to smoothly perform the turning traveling. As compared with the case where the steering wheel is steered by a large amount, the operation is easier to perform, and since there are only two wheels on the left and right, a small turn is possible and there is less risk of roughening the ridges.

[0006]

Therefore, with a rational structure, the riding work mode can be adopted without increasing the size of the vehicle body, the labor load on the worker during the management work can be reduced, and the headland turning and When traveling over ridges,
It has become possible to provide a working machine that can ensure running safety by walking control and can perform this kind of work easily and efficiently.

[0007]

Embodiments will be described below with reference to the drawings. Figure 1
Fig. 1 shows a work vehicle for performing management work such as medium tillage work in a ridged field. This work vehicle is equipped with a rotary tilling device 2 (an example of a ground work device) for performing weeding work on the front side of the traveling machine body 1 in the furrowing field in the furrows and on the left and right slopes of the furrows,
The rear part of the machine is equipped with a soil plate 3 for raising plowing soil left and right. The traveling vehicle body 1 is provided with a pair of left and right traveling wheels 5, 5 on the left and right lateral sides of the mission case 4, and an engine 8 having a vertically oriented output shaft is mounted and supported above the mission case 4, and a rear portion of the mission case 4 is provided. A steering handle 9 is extended from the lower side to the upper side.
The power of the downward output shaft of the engine 8 is the friction main clutch 1
0 is supplied to the mission case 4 and is transmitted to the left and right traveling wheels 5 via the hydrostatic continuously variable transmission 11 provided in the mission case 4 to drive and drive the vehicle body. A power transmission system is configured so that power is supplied to a power take-off shaft 12 provided in the front portion of the machine body along the longitudinal direction of the machine body via a work clutch therein. A finger-operated speed change operation tool 13 for performing a speed change operation of the hydrostatic stepless transmission 11 is provided near the right-handed steering grip 9a of the steering handle 9, and the finger-operated speed-change gear 13 is provided near the left-handed steering grip 9a. The main clutch lever 14 is provided so that the main clutch 10 can be turned on and off.
The on / off operation lever 15 for the work clutch is provided on the intermediate panel portion 9d of the steering handle 9. Further, on the rear side of the mission case 4, a diff lock pedal 16 that sets the left and right axles disposed in the mission case 4 to the left and right integrally by a depressing operation, and a diff lock pedal that releases the diff lock state by depressing operation. A release pedal 17 is provided.

The left and right traveling wheels 5, 5 are set in a vertical posture as shown in FIG. 5 and in a state in which they are set in an upward sloping posture along the slope of the ridge as shown in FIG. The posture can be switched freely. More specifically, the traveling wheel 5 on the right side is connected to a bracket 18 fixed to the mission case 4 by a support arm 21 extending from a bearing boss portion 20 of an axle 19 so as to be rotatable around the longitudinal axis X1 of the machine body. In addition, the support arm 21 is selectively pin-connected to the plurality of adjustment holes 22 formed in the bracket 18 so that the posture can be switched in a plurality of steps as described above. The axle 19 is transmitted by the universal joint 23. It is configured to be bendable while maintaining the state. Similarly, the traveling wheel 5 on the left side is configured such that the axle 24 can be bent while maintaining the transmission state by the universal joint 25, and the bearing boss portion 27 of the axle 24 is attached to the bracket 26 fixed to the mission case 4. Attach the extended support arm 28 to the longitudinal axis X of the machine body.
A rotary shaft 2 that is rotatably connected around 1 and is erected and supported by a bracket 26 at a position eccentric from the rotary fulcrum.
The arm 30 fixed to 9 and the arm 31 extending from the bearing boss portion 27 are pivotally connected to each other via a link 32, and the female screw member 34 provided on the operation arm 33 connected to the rotating shaft 29 is provided. As the screw shaft 35 to be screwed is rotated by the operation handle 36, the rotating shaft 29 is rotated, and the wheel 5 can be changed in posture in a stepless manner around the front-rear axis X1. . In this manner, the inclination posture of the vehicle body can be changed and adjusted while the posture is switched to the two states as described above.

The rotary tiller 2 is movably connected to a fixed member 37 fixedly connected to the front part of the mission case 4 through a three-point link mechanism 38, and is paired with the ground wheel 39 while following the ground contact. It is configured to move up and down relative to the airframe. This rotary tiller 2 is shown in FIG.
As shown in FIG. 1, a first tilling portion 2a that rotates around a horizontal axis center that cultivates the groove portion between the ridges, and a second left and right tilling portion 2b that rotates around an inclined axis center that cultivates the slope portion of the ridges. With and
Power is supplied from the power take-off shaft 12 of the mission case 4 to the input shaft 42 that is maintained in a substantially horizontal state regardless of the lifting operation via the relay shaft 41 having the universal joints 40 at both ends, and the rotary transmission case 4
Via a bevel gear and a transmission shaft (not shown) in
Power is supplied to the drive shaft 44 of the tiller 2a, and power is supplied from this drive shaft 44 to the drive shaft 46 of the second tiller 2b via the universal joint 45. The outer end of the drive shaft 46 of the second tillage part 2b is bearing-supported by a support arm 47 extending from the rotary transmission case 43. Further, the electric cylinder 4 is mounted on the support portion of the ground wheel 39 for the rotary transmission case 43.
8 is interposed and the relative height of the ground wheel 39 can be changed and adjusted by the electric cylinder 48 by operating an operation switch (not shown) provided on the side of the steering handle 9 to increase the working depth to ground. It is configured to be adjustable.

A grounding wheel 51 (an example of a grounding body) is freely rotatably mounted on the lower end of a vertical axis 50 to which a cylindrical portion 49 to which the soil culture plate 3 is connected is fitted and which is screwed to adjust the height. A driver's seat 53 is connected to and supported by a cylindrical shaft portion 52 that supports the vertical axis 50 with respect to the machine body while being positioned above the ground wheel 51. Then, the cylindrical shaft portion 52
The shaft portion 54 fixedly connected to the machine body side is rotatably fitted into and supported by the cylindrical boss portion 55 fixed to the frame of the machine body via the bearing, and the soil pad 3, the driver's seat 53, and the grounding. Each of the wheels 51 is integrally connected to the machine body so as to be rotatable relative to the left and right around a front and rear axis Y. With this configuration, the driver's seat 53 and the cultivating plate 3 can always maintain a stable horizontal posture even when the machine body tilts to the left or right while traveling in the ridge.

The steering handle 9 is configured such that the posture can be switched between a riding steering mode in which the steering grip portion 9a is located on the front side of the aircraft with respect to the driver's seat 53 and a walking steering mode extending to the rear side of the aircraft. is there. More specifically, as shown in FIG. 3, the steering handle 9 has a base end side handle portion 9b formed in a gate shape in a front view in a state of bypassing the traveling vehicle body 1 and the base end side handle portion 9b. It is composed of a distal end side handle part 9c which is connected so as to be relatively swingable around a horizontal axis X2 and has a steering grip part 9a provided on the free end side.
b is rotatably supported around the horizontal axis X3 with respect to the body side frame. Then, a plurality of locking recesses 58 are formed in the left and right locking tools 57 that are pivotally supported on both the left and right sides of the base end side handle portion 9b and are integrally connected by the erection member 56. Pin 59 that locks mechanically
Is provided, and the left and right locking tools 57, 57 are locked to the fixing pin 59 by the operation tool 60, and the lock release state is configured to be freely switchable, and the lock is released by the operation tool 60. Then, the posture can be selectively switched between the state where the proximal end side handle portion 9b is located on the rear side and the state where the proximal end side handle portion 9b is located on the front side, and the posture can be locked by operating the operation tool 60 in the locked state. it can. As for the relative posture of the distal end side handle portion 9c with respect to the proximal end side handle portion 9b, the locking tool 62 that is locked to one of the two lateral stays 61 formed on the distal end side handle portion 9c is fixed to the proximal end side handle portion 9b. Horizontal axis X4
It is structured so as to be swingably supported around it, and is configured to be urged to swing in the locking direction by a spring 63, and this locking tool 62 is released by an operating tool 64 so that either side stay 61 is released.
It is possible to change the relative posture by selectively locking and setting to the locked state. Then, as shown in FIG. 1, in a state in which the proximal end side handle portion 9b is located on the rear side, the distal end side handle portion 9c is relatively moved up to operate while walking on the rear side of the airframe. The riding type that can be set in a form and can be steered while seated in the driver's seat 53 by relatively lowering the distal end side handle portion 9c in a state where the proximal end side handle portion 9b is located on the front side. Can be set to the control form.

[Other Embodiments] As an operation structure for switching the posture of the steering handle 9 between the walk type steering mode and the riding type steering mode, as described above, the proximal end side handle portion 9b and the distal end side handle portion 9c are provided. Instead of adjusting the position of each with an operating tool, using a link mechanism or the like to configure the postures to be simultaneously switched with one operating tool,
Further, the operability is improved. Further, the height of the rotary tiller 2 may be adjusted by using a hydraulic cylinder or another actuator instead of the electric cylinder, or by adjusting the lever manually. The adjustment for changing the angle of the traveling wheel may be performed by using an actuator such as a hydraulic cylinder or an electric cylinder, instead of being manually performed. The grounding body for supporting the grounding of the driver's seat may have a structure in which the cultivating plate itself only supports the grounding instead of the wheels.

It should be noted that reference numerals are added to the claims for facilitating the comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

[Figure 1] Overall side view of the working machine

[Fig. 2] Overall plan view of the working machine

FIG. 3 is a side view showing a posture switching mechanism of a steering handle.

FIG. 4 is a front view of a rotary tiller.

FIG. 5 is a cutaway plan view of a wheel support portion.

FIG. 6 is a cutaway rear view of the support portion of the wheel.

[Explanation of symbols]

 1 Traveling Aircraft 2 Ground Work Device 5 Traveling Wheel 9 Steering Handle 9a Steering Grip 51 Grounding Body 53 Driver's Seat

Claims (1)

[Claims] 1. A ground work device (2) is provided in front of a traveling body (1) having a pair of left and right wheels (5), (5),
A driving seat (53) is provided behind the traveling machine body (1) while being grounded and supported by a grounding body (51), and a steering wheel (9) provided on the traveling machine body (1).
The work is configured so that the posture can be freely switched between a riding control mode in which the control grip portion (9a) is located on the front side of the vehicle body with respect to the driver seat (53) and a walking control mode that extends to the rear side of the vehicle body. Machine.