JPH0541110Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a power steering device for a traveling vehicle such as a tractor.

(Prior Art) In a running vehicle such as an agricultural tractor, a power steering device supports a handle shaft on the back side of a steering section component behind the engine, and a fully hydraulic controller is arranged on the front side of the steering section component. This controller is connected to a front wheel steering hydraulic cylinder provided near the front axle via a hydraulic hose.

(Problem to be solved by the invention) In general, the vibrations of the vehicle body and the components of the control section attached to it, such as hot air shielding plates or control panels, are different. The control components of the independently assembled cabin are capable of relative movement with the vehicle body, so the controller attached to the control component and the hydraulic cylinder fixed to the vehicle body are made of inexpensive metal pipes. Unable to connect with
This requires an expensive flexible hose, and when removing the operating part components for maintenance and inspection, the hydraulic hose must be connected and disconnected, making the work cumbersome and causing oil leaks. Furthermore, since the controller protrudes above the engine, it becomes difficult to attach and detach the cylinder head.

(Means for Solving the Problems) In the present invention, the controller 13 is attached to the front part of the cylinder body 2A of the engine 2, and is extendable and retractable, passing between the handle shaft 25 supported by the control part component 40 and above the cylinder head 2B. By connecting with a universal joint shaft 41, the problems of the prior art described above can be solved.

That is, the specific configuration of the problem solving means in the present invention is a controller that supports a handle shaft 25 via a steering section component 40 behind the engine 2 constituting the vehicle body 1, and operates the hydraulic cylinder 7 for front wheel steering. 13 is attached to the front part of the cylinder body 2A of the engine, and the controller 13 and the handle shaft 25 are connected by an extendable universal joint shaft 41 passing above the cylinder head 2B.

(Function) When the handle shaft 25 is rotated, the cylinder head 2 of the engine 2 is rotated in front of the control section component 40.
Universal joint shaft 4 passing above B
The controller 13 is operated via the controller 1, hydraulic oil is supplied from the controller 13 to the hydraulic cylinder 7 via 14 and 15, and the front wheels 6 are steered by the operation of the hydraulic cylinder 7. The relative movement between the handle shaft 25 and the controller 13 is absorbed by the joint portion of the universal joint shaft 41 and the expandable structure.
When attaching and detaching, one end of the universal joint shaft 41 is attached and detached.

(Example) The present invention will be described in detail below with reference to the illustrated embodiment.

FIG. 2 shows an agricultural tractor equipped with an independently assembled cabin. In FIGS. 1 to 4, reference numeral 1 denotes a tractor body, which is composed of an engine 2, a transmission case 3, and the like. 4 is a front axle frame attached to the engine 2, and 5 is a front axle case, which is suspended from the front axle frame 4 via a center pin, and front wheels 6 are provided at both left and right ends of this front axle case 5. .

Reference numeral 7 denotes a hydraulic cylinder for front wheel steering, which is installed at the rear of the front axle case 5. As shown in FIG. It is now possible to operate the steering around the vehicle. 11 is a radiator, and 12 is a bonnet that covers the engine 2 and the like. Reference numeral 13 denotes a fully hydraulic controller for controlling the cylinder 7, which is mounted on a mounting base 39 at the front of the cylinder body 2A of the engine 2.
and is connected to the hydraulic cylinder 7 via metal pipes (or hoses) 14 and 15.

16 is a rear wheel, and 17 is a rear wheel fender. 1
8 is an independent assembly type cabin, with 1 door on both the left and right sides.
It has 9. The cabin 18 has a driver's seat 21 on the internal floor plate 20, and an instrument panel 23 and a handle 24 on the front wall plate 22 side behind the engine 2.The cabin 18 is equipped with an instrument panel 23 and a handle 24 on the front wall plate 22 side behind the engine 2. It is freely installed. The front wall plate 22 serves both as a hot air shield and as a brake cylinder attachment.
Like the instrument panel 23, it serves as a control section component 40.

The handle 24 is supported by a handle post 26 via a handle shaft 25, and the handle post 26 is attached to a support frame 27 within the instrument panel 23 via a vibration isolator.

As shown in FIGS. 1 and 2, the handle shaft 25 has a joint 28 and a shaft 29.
The input shaft 33 of the controller 13 is interlocked with the input shaft 33 of the controller 13 via a universal joint shaft 41 having a joint 30, a shaft 31, a joint 32, and the like. The shaft 29 is supported by a support frame 27 via a vibration isolator (not shown).

The joint 30 is located forward of the front wall plate 22 of the cabin 18 and is located at the cylinder head 2B of the engine 2.
It is located at a more rearward position and is configured to be separable from the shaft 31. The joint 32 is located at the upper front of the cylinder head 2B, and is detachably fitted to the input shaft 33 via a bolt 43 or a pin.

The shaft 31 has a joint 3 as shown in FIGS.
The cylindrical shaft 31A and the inner shaft 31B are spline-fitted, and the universal joint shaft 41 It is expandable. 42 is a grease cap provided at the end of the cylindrical shaft 31A;
B, and prevents grease from leaking between the two shafts 31A. The shaft 31 is tilted forward and upward, and the grease cap 42 is provided upward, so that no grease leaks from the grease cap 42.

According to the above configuration, when the handle 24 is operated, the controller 13 is operated via the handle shaft 25, the universal joint shaft 41, and the input shaft 33, and the hydraulic cylinder 7 is operated in the left-right direction to move the front wheel 6 around the king pin 10. The steering can be operated.

When the steering section component 40 or the cabin 18 vibrates with respect to the vehicle body 1, the shaft 29 vibrates with respect to the input shaft 33.
The relative position of joint 30,3 changes.
2, and also when the shafts 31A and 31B expand and contract.

From the vehicle body 1 to the control unit component 40 or the cabin 1
8, the joint 30 is removed from the shaft 29, and when the cylinder head 2B is removed from the cylinder body 2A of the engine 2, the joint 32 is removed from the input shaft 33, and the joint 32 is removed together with the shaft 31 as shown by the two-dot chain line in FIG. lift it up. In this case, input shaft 3
To fit and remove the joint 32 from the shaft 31A,
31B is accompanied by expansion and contraction.

Note that the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways. For example, the traveling vehicle may be a tractor without a cabin or other agricultural or general industrial vehicle, and the shafts 31A and 31B may be connected by serrations. It's okay.

(Effect of the invention) According to the invention detailed above, the controller 1
3 is attached to the cylinder body 2A of the engine 2, it does not interfere with the attachment and detachment of the cylinder head 2B, and an inexpensive metal pipe can be used for connection to the hydraulic cylinder 7 fixed to the vehicle body 1. Since the handle shaft 25 supported by the member 40 and the controller 13 are connected by an extensible universal joint shaft 41, even if the two vibrate relative to each other, it can be absorbed, and the cylinder head 2B or the control section structure The member 40 can be easily attached and detached.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional side view of the main parts, FIG. 2 is a partially cross-sectional side view of a tractor with a cabin, FIG. 3 is a cross-sectional view of a universal joint shaft, and FIG. Figure 4 is a power steering diagram. 1... Tractor body, 2... Engine, 7...
Hydraulic cylinder, 13...Controller, 14,1
5...Pipe, 25...Handle shaft, 40...Control unit component, 41...Universal joint shaft.

Claims (1)

[Scope of utility model registration request] A handle shaft 25 is supported at the rear of the engine 2 constituting the vehicle body 1 via a steering component member 40, and a controller 13 that operates the hydraulic cylinder 7 for front wheel steering is connected to the cylinder body 2A of the engine.
A power steering device for a running vehicle, characterized in that the controller 13 and the handle shaft 25 are connected to each other by an extendable universal joint shaft 41 passing above the cylinder head 2B.