JPH09109902A - Steering device of riding work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the steering operation of a car body light, by positioning a steering wheel by converting to two positions, a position corresponding to a driver seat, and a prescribed position of a load-carrying platform, by regulating the turn of a power steering unit to a pipe link. SOLUTION: A pipe link 31 turning longitudinally by making a horizontal lateral shaft as the center, and allowable to fix at a random position, is provided, and a power steering unit PSU is installed to the front end of the pipe link 31 allowable to turn and to fix. By regulating the turn of the pipe link 31 to the car body, and regulating the turn of the power steering unit PSU to the pipe link 31, the steering handle 30 of the power steering unit PSU is positioned by converting to two positions at a position corresponding to a driver seat 14 and at a prescribed position of a load-carrying platform 15. Consequently, the steering operation of the car body 12 can be made light, and the work can be carried out by saving the manpower.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering system for a passenger work vehicle.

[0002]

2. Description of the Related Art A passenger work vehicle such as a cabbage harvester is provided with a harvesting work unit on a self-propelled vehicle in which a pair of left and right traveling units are turned by operating a steering wheel provided in a boarding operation unit on the vehicle body. It is configured to be mounted and picked up crops such as cabbage from the field by the harvesting work unit while traveling on the vehicle body and collecting them on the vehicle body.

[0003]

In a cabbage harvesting machine or the like, if the harvested product is damaged or is collected in an improperly processed state, the commercial value is significantly reduced. Therefore, it is necessary to pay close attention to the state of the harvested product that is pulled up from the field by the harvesting unit during the work and collected on the car body, and, while performing necessary auxiliary actions, it is necessary to harvest. In a conventional cabbage harvester, it is almost impossible for an operator on board the boarding section to take the above-mentioned precautions or perform auxiliary actions while operating the vehicle body. There was a difficulty that labor saving work was not possible because another worker was required.

[0004]

Therefore, according to the present invention, even when harvesting work is performed by the harvesting work section while the vehicle body is traveling, it is possible to operate the vehicle body by one operator, pay attention to the harvested matter, and perform auxiliary actions without difficulty. The present invention provides a steering system for a passenger work vehicle which can be carried out. That is, the steering system for a passenger work vehicle according to the present invention is a passenger work vehicle in which an actuator for turning a pair of left and right traveling portions supported on a vehicle body to the left and right is expanded and contracted by a power steering unit including a steering handle, The vehicle body is provided with a pipe link that is rotatable back and forth about a horizontal horizontal axis and can be fixed at any rotation position, and the power steering unit is rotatably and fixedly attached to the tip end of the pipe link. By adjusting the rotation of the pipe link with respect to the vehicle body and the rotation of the power steering unit with respect to the pipe link, the steering handle of the power steering unit is converted into at least two positions, a part corresponding to the driver's seat and a predetermined part on the luggage carrier. It is characterized in that it can be positioned.

Further, in a passenger work vehicle in which a power steering unit equipped with a steering handle extends and contracts an actuator for turning a pair of left and right traveling parts supported on the vehicle body in the left and right directions, a horizontal transverse shaft is attached to the vehicle body. A pipe link that can be rotated back and forth around the center and can be fixed at an arbitrary rotation position is provided, and the power steering unit is rotatably and fixedly attached to the tip end of the pipe link.
A steering system for a passenger working vehicle has hydraulic pipes that connect between the steering unit and the actuator and between the power steering unit and the hydraulic fluid supply / discharge unit inserted and housed in the pipe link.

[0006]

When the passenger working vehicle in which the device of the present invention is carried out is operated in a non-working state on the road, etc., the steering wheel of the power steering unit is located at a position corresponding to the driver's seat. Tata can concentrate on manipulating the vehicle body in a comfortable posture while sitting in the driver's seat. Then, when working while the vehicle body is traveling, that is, during work operation, the steering handle of the power steering unit is rotated rearward from the portion corresponding to the driver's seat to be positioned at a predetermined portion on the cargo bed. The operator can move to the top of the loading platform, operate the steering wheel, and observe the working condition beside the operator to perform the necessary actions and work properly. Since the hydraulic pipes connecting the power steering unit and the actuator, and the power steering unit and the hydraulic oil supply / discharge section are inserted and housed in the pipe link, the power steering unit is provided. When the position of the steering wheel is changed, the hydraulic pipe line does not come into contact with other objects to be damaged or entangled.

[0007]

EFFECTS OF THE INVENTION Since the present invention is constructed and operates as described above, even when the intended work is performed by the working unit while the vehicle body is traveling, the steering operation of the vehicle body can be performed lightly and the operation is light. It is possible to properly and appropriately pay attention to the work situation and ancillary actions by one operator beside the operation of the operator, thereby enabling labor-saving work. The pipe link supporting the power steering unit also serves as a guard for the operator, which is safe, and the hydraulic pipe is inserted and housed in the pipe link so that it does not come into contact with other objects. It has the advantage that it will not be damaged or entangled.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention showing a case where the passenger working vehicle is a cabbage harvester will be described with reference to the drawings. FIG. 1 is a side view of the cabbage harvester in which the device of the present invention is implemented. FIG. 2, FIG. 2 is a schematic front view thereof, and FIG. 3 is a schematic view showing a pipeline structure of the device of the present invention.

In FIG. 1 and FIG. 2, an engine and a hydraulic system are provided on the left front part of a vehicle body (12) having a pair of left and right front running parts (10) (10) and rear running parts (11) (11). A machine room (13) for accommodating the hydraulic oil supply / discharge section of the machine room (13) is provided, and a driver's seat (14) of the boarding operation section is provided on the top plate of the machine room (13), and the machine room (13) is provided next to the machine room (13). The upper part of the vehicle body at the side part and the rear part is the cargo bed part (15).

Then, a harvesting working section (16) is provided on the cargo bed section (15) extending from the lateral side to the rear side of the machine room (13) to form a riding type cabbage harvesting machine. In addition, the harvesting work unit (16) pulls up the cabbage to be planted in the ridges of the field and lifts and transports it diagonally upward and removes unnecessary foliage during the transfer to remove the cabbage from the harvesting work unit (16). Transfer end part (16a)
It is constructed so as to be sent out to and collected from the cargo bed section (15).

The pair of left and right rear running parts (11) (11) includes drive wheels provided at the rear ends of the track frames (17),
An elastic endless belt is wound around a guide wheel arranged at the front end and a group of rolling wheels arranged in a row between the two wheels to form a track frame.
It is supported by a support case (19) on the vehicle body side so as to be swingable back and forth around a horizontal horizontal axis (18) located in the middle of the front-rear direction of the frame. Then, the driving wheels are rotationally driven by the power transmitted from the engine mounted in the machine room (13) through the mission (20), the support case (19), and the rear drive case (21). Has been done.

On the other hand, a pair of left and right front running parts (10) (10)
Is the body so that it can swing left and right around the center pin.
The front axle case (22) attached to (12) is provided at the left and right ends of the front axle case (22) so as to be able to turn to the left and right about the vertical axis. In other words, a final case that can be rotated around the kingpin axis.
Provided at the left and right ends of the front axle case (22) are tracks (23) and (23), and a track frame is provided at each final case (23).
(24) is attached, and the left and right front running parts (10) and (10) are configured by hanging the elastic endless belt around the drive wheel, the guide wheel and the rolling wheel group mounted on the track frame (24). Power is supplied to each drive wheel from the engine through the mission (20), front drive shaft (25), front axle case (22), final case (23), and front drive case (26). Is configured to communicate.

The left and right final cases (23)
Knuckle arms (27) and (27) attached to (23) respectively
The tie rods (28) are connected to each other, and the actuators (29) are interposed between the final cases (23) and the knuckle arms (27), respectively. ) (29) is expanded and contracted so that the front traveling portions (10) and (10) are turned left and right, and the actuator (2
9) Expansion and contraction of (29) power steering unit (PS
U).

The power steering unit (PSU)
Is equipped with a wheel type steering wheel (30), and the hydraulic circuit is switched by the turning operation of the steering wheel (30) to expand and contract the actuators (29) (29) as desired. This power steering unit (PSU) is provided in the following configuration in the present invention.

That is, a pipe link (31) formed in a shape that avoids interference with the driver's seat (14), machine room (13), etc.
Of the pipe link (31) is mounted on a support portion provided on the lateral side surface of the machine room (13) so as to be rotatable in the front-rear direction about the horizontal horizontal axis and freely fixed at any rotational position. A support seat (32) is connected to the distal end portion so as to be rotatable and fixed about the horizontal axis, and the power steering unit (PSU) is fixed to the support seat (32).

Then, the pipe link (31) is rotated and fixed to a predetermined position in front as shown by the solid line in FIGS. 1 and 2, and the support seat (32) at the tip of the pipe link is fixed to a predetermined position. When fixed in the rotating position, the power steering unit
The steering wheel (30) of the (PSU) is in a driver posture corresponding to the front part of the driver's seat (14), and the pipe link (31) from the driver posture position is shown by phantom lines in FIGS. 1 and 2. So that it can be fixed by rotating it to a predetermined position in the rear.
When the (32) is extended and fixed, the steering handle (30) of the power steering unit (PSU) is moved to the loading platform (15).
The work driver posture is located at a predetermined position above.

The power steering unit
(PSU) and a hydraulic line (34) for connecting and communicating between the hydraulic oil supply / discharge section (33) formed of a hydraulic pump or the like in the machine room (13),
And a hydraulic line (35) for connecting and connecting the power steering unit (PSU) and the actuators (29, 29).
Is formed by a flexible tube having a margin so that it can follow the movement of the pipe link (31) and the power steering unit (PSU), and these are inserted and housed in the pipe link (31) to prevent entanglement. It is designed to prevent contact with other objects.

In the illustrated embodiment, the machine room
Pipe links (31) are provided on both the left and right sides of (13) to support the support seat (32) from both sides, but in some cases, only on the outside or inside of the machine room (13). A pipe link (31) may be provided to cantilever the support seat (32). Further, (36) is a front cover provided so as to be movable together with the support seat and the power steering unit.

[Brief description of the drawings]

FIG. 1 is a side view of a cabbage harvester in which the device of the present invention is implemented.

FIG. 2 is a schematic front view thereof.

FIG. 3 is a schematic diagram showing a pipeline structure of the device of the present invention.

[Explanation of symbols]

 10 Traveling Device 12 Car Body 29 Actuator 30 Steering Handle 31 Pipe Link 33 Hydraulic Oil Supply / Discharge Port 34 Hydraulic Pipeline 35 Hydraulic Pipeline PSU Power Steering Unit

Claims (2)

[Claims] 1. A pair of left and right running parts supported on a vehicle body (12)
(10) Actuator (29) that turns (10) left and right
In a passenger working vehicle in which a power steering unit (PSU) equipped with a steering handle (30) extends and contracts (29), the vehicle body (12) is rotatable forward and backward about a horizontal horizontal axis and at an arbitrary rotation. Pipe link (31) that can be fixed in the moving position
Is provided at the tip of the pipe link (31).
A steering unit (PSU) is rotatably and fixedly attached, and power steering is performed by adjusting the rotation of the pipe link (31) with respect to the vehicle body (12) and the rotation adjustment of the power steering unit (PSU) with respect to the pipe link (31). The riding handle, characterized in that the steering wheel (30) of the unit can be converted into at least two positions, that is, a part corresponding to the driver's seat (14) and a predetermined part of the luggage carrier (15). Steering device for work vehicles. 2. A pair of left and right running parts supported on the vehicle body (12)
(10) Actuator (29) that turns (10) left and right
In a passenger working vehicle in which a power steering unit (PSU) equipped with a steering handle (30) extends and contracts (29), the vehicle body (12) is rotatable forward and backward about a horizontal horizontal axis and at an arbitrary rotation. Pipe link (31) that can be fixed in the moving position
Is provided at the tip of the pipe link (31).
The steering unit (PSU) is rotatably and fixedly attached, and is installed between the power steering unit (PSU) and the actuators (29) and (29), and between the power steering unit (PSU) and the hydraulic oil supply / discharge unit (PSU). The steering apparatus for a passenger work vehicle according to claim 1, wherein a hydraulic pipe line (34) (35) for connecting to the vehicle (33) is inserted and housed in the pipe link (31).