JPS63106179A - Power steering system for farm working vehicle - Google Patents

Abstract

PURPOSE:To get rid of any necessity to directly drive a control valve with a handle operating shaft, by linking an operating member being slidden by handle operation and rotated by feedback control actuation, up with the control valve. CONSTITUTION:When a handle is operated, an operating shaft 5 is rotated, and an operating member 10 being connected via this operating shaft 5 and a connecting pin 9 is slid. A driving arm 22 is rocked by this slide motion of the operating member 10, and a spool 23A of a control valve 23 is pushed and pulled. A hydraulic cylinder is operated by actuation of this control valve 23, thus steering operation takes place. A pitman arm 19 is operated by this steering operation, and the operating member 10 is rotated around the shaft center via a reduction gear mechanism 2. With this rotation, the operating member 10 is slidingly restored to the original position, and the control valve 23 is reset to the neutral position via the driving arm 22, thus the steering operation comes to a stop.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power steering device for an agricultural machine called an integral type or a semi-integral type, which is installed in an agricultural machine such as a rice transplanter.

[Conventional technology]

In the power steering device of this type of agricultural machine,
Conventionally, a power steering control valve was installed inside the handle post (for example, Japanese Utility Model Publication No. 55-78568).
.

[Problem that the invention seeks to solve]

Therefore, for example, when performing maintenance on control valves,
Alternatively, in the event of a failure, the handlebar post must be disassembled and other equipment connected to the control valve must also be removed at the same time, making the work complicated. There wasn't. One object of the present invention is to provide a mechanism that can overcome the conventional drawbacks by simply modifying a mechanism that links a handle operating shaft and a control valve.

[Means for Solving the Problems] The characteristics of the present invention are: (1) The handle operation shaft supports an operating member that is slidable in the axial direction of the operation shaft by the rotational operation of the nozzle; and (2) The operation described above. A feed pack control system is constructed by linking the members to the pitman arm via a reduction mechanism; ■ A linkage mechanism links the spool of the power steering control valve, which is removably provided on the outer surface of the handlebar post, and the operating member. The control valves are connected to each other so that the control valves can be switched by vertically sliding the actuating member, and the effects are as follows.

[For production]

First, the operation as a power steering device will be explained.

As shown in Figures 1 and 2, ■ When the handle (6) is rotated, the actuating member Q (I slides in the axial direction of the operating shaft (5), the control pulp is switched, and the wheel is rotated to the handle. Rotate in the direction of operation.

■ Then, the pitman arm is rotated as the wheel changes direction, and the operating member is also rotated via the gear mechanism (2), and this operating member αQ is reversely slid in the axial direction of the rotary operation shaft, It returns to its original position and the control pulp returns to its neutral position (feed pack operation of the actuating member).

As described above, the configuration supports the operating member that slides with respect to the handle operating shaft and rotates with the feed pack control operation, and transmits the operation of the operating member to the control pulp via the linkage mechanism. By taking this, there is no need to directly drive the control pulp with the handle operating shaft, and the control pulp can be attached to the outer surface of the handle post. Moreover, since this control pulp can be attached to and detached from the handle post, only the control pulp needs to be attached and detached during maintenance.

〔Effect of the invention〕

As a result, maintenance work becomes easier and
Even when producing non-power steering specifications and power steering specifications, there is no need to change or rearrange other related parts.

〔Example〕

A power steering device mounted on a rice transplanter as an agricultural machine will be explained. As shown in Figures 1 and 2, a steering wheel post (4) is installed on the upper surface of the transmission case (1) via a gear box (X) containing a steering reduction gear mechanism (2), and this The operating shaft (5) is pivoted to the handle post (4) and the handle (6)
) is installed.

A transmission member (7) having a circumferential groove (7a) formed on the outer peripheral surface is integrally fixed to the lower end of the operating shaft (5), and a handle is inserted into the circumferential groove (7a) of the transmission member (7). post(
4) The tip pin portion of the reamer bolt (8) protruding from the outer circumferential surface is engaged, and movement of the operating shaft (5) in the axial direction is prevented even by rotation of the handle (6).

An operating member QO is externally fitted onto the lower end of the transmission member (7) via a connecting pin (9). The axial center (
A long hole (10 m) is drilled that is inclined to the long hole (10 m), and when the operating shaft (5) is rotated by operating the handle, the connecting pin (9) rotates and comes into contact with the end face of the long hole (10 m). The actuating member (10) is forcibly slid up and down along the axis (X) direction.

On the other hand, the actuating member αQ is spline-connected to the upper end of the first vertical shaft αυ protruding from the gear box (X). Since this spline portion is formed so that the coefficient of static friction is as large as υ than the coefficient of dynamic friction, the power steering will not operate unnecessarily and the straightness of the vehicle will not be impaired. A second vertical axis (6) is pivotally supported on the side of the first vertical axis <111, and the first vertical axis (6) and Behergya (14), (
At the same time, the third vertical axis αQ passing through the transmission case (1) is pivotally supported below the first vertical axis α℃, and the transmission is transmitted to the second vertical axis side and the gear αη, (g), and the reduction gear mechanism(
2) is configured.

A pitman arm α is attached to the lower end protrusion of the eighth vertical axis αQ.
The left and right knuckle arms (20A) are fixed.

(20B) and are interlocked and connected via left and right rods □□□, 05.

As shown in FIGS. 1 and 5, the outer peripheral surface of the handle post (4) is bulged in correspondence with the operating member αQ,
This bulge (4a) has an axis (
g) Pin C that can rotate around it! A V groove (
The inner arm (22A) that engages with the IOA) and the outer arm (22B) that is interlocked and connected to the push/pull spool (23A) of the power steering control pulp Q are fixed, and both arms (22
A) and (22B) constitute a drive arm (e) for the control pulp (g). This drive arm (a)
The spool (28A) is pushed and pulled by the vertical sliding of the operating member QQ based on the handle rotation operation, and the control valve (to) is
It is possible to switch and control the operating member QO and the push/pull spool (28
A).

Next, the feed pack system will be explained in detail. As shown in FIGS. 8 and 4, a linking arm (C) that can swing integrally with the right knuck arm (20B) and extends in the opposite direction, and an engine (E) support frame (23) are connected to each other. A power steering hydraulic cylinder (2) is installed across the hawk-shaped bracket (E) fixed to the side surface, with the tip of the piston (27A) interlockingly connected to the linkage arm (manufactured by Co., Ltd.). The pressure oil supply structure to this hydraulic cylinder ■ is the transmission case (
1) The hydraulic oil sucked up from the control valve (
23) into a hydraulic cylinder.

Based on the above configuration, the operation during power steering will be explained.

(2) When the handle (6) is operated, the operating shaft (5) rotates, and the operating member αQ, which is connected to the operating shaft (5) via the connecting pin (9), slides in either the up or down direction.

(2) The sliding movement of the actuating member αQ causes the drive arm to swing and push and pull the spool (23A) of the control valve @.

- Steering operation is performed when the hydraulic cylinder head is activated by the operation of the control valve (23).

■ This steering operation allows the knuckle arm (2
When 0A) and (20B) are activated, pitman arm Ql
are operated in conjunction with each other to rotate the actuating member αO around the axis (X) circumference υ via the reduction gear mechanism (2).

■ Then, due to the engagement between the long hole (10a) and the connecting pin (9), the actuating member α0 rotates and slides back up and down to the original position before the steering operation, and the drive arm (2) (through the control valve) returns to the neutral position, and steering operation stops.

In addition, when the power steering device is stopped and the steering wheel (6) is forcibly operated, the operating member α is
The connecting bottle (9) that was operating within the long hole (108) stroke of Q is brought into contact with the long hole (1 oa) K, and the operating shaft (5
) is transmitted to the operating member Q (IK), and the reduction gear mechanism (2
) to the pitman arm QIK and performs steering operations.

In this way, the reduction gear mechanism (2) acts as a speed increase mechanism during power steering operation, and the tick α arm (2OA), (2
Since the feed pack operation of the actuating member αQ can be quickly performed by the operation of 0B), the responsiveness to the stoppage of the steering wheel is good.

[Another example]

■Another embodiment of the actuating member αQ is shown.

As shown in FIGS. 6 and 7, an operating member (10) is fitted onto the operating shaft (5) which is fitted and supported within the first vertical axis αυ so as to be slidable up and down, and This actuating member (10) is fitted and held through a long hole (10 m) onto a connecting pin (9) protruding from the operating shaft (5) in order to slide up and down as the operating shaft (5) rotates. be. and,
The push/pull spool (23A) of the control valve (A) is loosely fitted onto the outer circumferential surface of the operating member α1 via the sleeve @full bushing, and an L-shaped mounting bracket (7) is extended from the sleeve. It is fixed at Therefore, even if the mounting bracket (7) is fixed to the push/pull spool (28A), since the sleeve bracket is loosely fitted, the operating member Q
Even if O is rotated by the feedback mechanism, there is no effect on the push/pull spool (23A). In addition, the mounting bracket (
7) [3] is formed to have approximately the same width as the hole in the handle post (4), and has a guide function when the operating member αQ slides up and down. The control valve (to) is connected by a bolt (2) to the mounting base c3I) of the nozzle post (4).

■Next, the mechanism in which the handle operating shaft (5) slides in the direction of the axis (X) to switch the control valve is shown.

As shown in FIG. 8, a cylindrical member 03 is fixed to the upper end of the first vertical shaft (6), and this cylindrical member 03 is loosely fitted to the lower end of the operating shaft (5). The vertical sliding state of this operating shaft (5) is
Shown in (a), (b), and (c) in the figure.

First, when the handle (6) is operated in the direction of the arrow, the connecting bottle (9) moves along the length measurement hole (838) of the cylindrical member (to), and the handle operation shaft (5) moves as shown in (B). To,
Switch the lifting control valve (to).

Then, when the feed pack system cylindrical member (to) is rotated in the direction of the arrow, the operating shaft (5) is returned down to its original state, and the control valve is returned to its neutral state.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the power steering device for an agricultural vehicle according to the present invention, in which FIG. 1 is a longitudinal sectional front view showing the connection between the control valve and the operating member, FIG. 2 is a longitudinal sectional side view showing the steering operation system, and FIG. Fig. 3 is a side view showing the feed pack system, Fig. 4 is a plan view showing the feed pack system, Fig. 5 is a cross-sectional plan view showing the drive arm section, and Fig. 6 is a diagram showing different connections between the control valve and the actuating member. 7 is a vertical sectional side view showing the embodiment, FIG. 7 is a vertical sectional side view showing another embodiment of the steering operation system, FIG. 9 is a vertical sectional side view showing another embodiment of the steering operation system, and FIGS.
, (c) are schematic views showing the operating state of the actuating member for the steering structure shown in FIG.
A) shows the state in which the handle is operated, (B) shows the state in which the actuating member has slid in the direction of the axis of the handle operation shaft, and (C) shows the state in which the actuating member has been rotated from the feed pack system and returned to its original position. Indicates the condition. (2)...Reduction gear mechanism, (4)...
Handle post, (5)... Handle operation shaft, (
a)...Handle, αQ...Operating member, αS...Pitman arm, (A)...
... Linkage mechanism, (g) ... Control valve, (28
A)...Spool. Agent Patent Attorney Shudai Kitamura 9
figure

Claims (1)

[Claims] The handle operating shaft (5) is built into the handle post (4).
), the operating shaft axis (
A feed pack control system is configured by supporting an operating member (10) that is slidable in the In addition, the spool (
23A) and the operating member (10) through a linkage mechanism (22).
A power steering device for an agricultural vehicle, in which a control valve (23) can be switched by vertically sliding an operating member (10) 1.