JPH0454062Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a steering device for an industrial vehicle.

BACKGROUND TECHNOLOGY As shown in FIG. 3, a conventional steering device of this type connects a steering shaft 3 of a steering column 2 provided on a dart board 1 so as to be adjustable back and forth to one end of a universal joint 4. A spline fitting shaft 5 is provided at the other end, and a steering gear box 6 is attached to this spline fitting shaft 5.
The spline portion of the input shaft 7 is fitted to the universal joint 4, and the mutual movement between the steering shaft 3 and the steering gear box 6 is absorbed by this spline portion and the universal joint 4.

Problems to be Solved by the Invention As mentioned above, the absorption means is composed of a universal joint 4 that absorbs longitudinal and lateral movements, and a spline portion that absorbs vertical movements, resulting in a complex structure and high parts and assembly costs. It was getting high.

Purpose of the invention The present invention was created in view of the above circumstances, and its purpose is to reduce component costs and assembly costs by reducing the amount of misalignment between the steering shaft and steering gear box to a single joint mechanism. An object of the present invention is to provide a steering device for an industrial vehicle that can perform the following steps.

Means and Effects for Solving the Problems The upper part of the steering column 15 is supported on the dart board 13 of the driver's cab 12 at an adjustment fulcrum 16 so as to be adjustable back and forth, and the lower end of the steering shaft 17 of the steering column 15 is provided with a linear spline. 23 is formed by opening downward, and a crowned spline portion 21 having an arc-shaped spline 22 is provided on the input shaft 20 of the steering gear box 19 provided on the vehicle body frame 10 side. A steering device for an industrial vehicle in which a spline portion 21 and the steering hole portion 18 are fitted to connect a steering shaft 17 and an input shaft 20 of a steering gear box 19.

As a result, vertical movement and longitudinal and lateral movement of the steering shaft 17 are absorbed by the fitting portion between the spline hole portion 18 and the crowned spline portion 21, and misalignment between the steering shaft 17 and the steering gear box 19 is prevented. A spline hole 18 is provided in the steering shaft 17, and the steering gear box 19
A crowned spline portion 21 is attached to the input shaft 20 of the
The spline hole 18 and the crowned spline part 21 can be assembled by simply fitting them together.

Embodiment Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 and 2. FIG. 1 shows the configuration of a steering device for an industrial vehicle according to the present invention. In the figure, 10 is a vehicle body frame, and a driver's cab 12 is mounted on this vehicle body frame 10 via a support mechanism 11. A bracket 14 is fixed to the dash board 13 of the driver's cab 12, and an adjustment fulcrum 16 of a steering column 15 is provided on the bracket 14.

A spline hole 18 is provided at the lower end of the steering shaft 17 of the steering column 15.

Further, a steering gear box 19 which is a control unit is fixed to the vehicle body frame 10.
The input shaft 20 has a crowned spline portion 2.
1 is formed, and this crowned spline portion 21 is formed by forming a spline 22 into an arc shape. This crowned spline portion 21
is inserted into the spline hole 18 of the steering shaft 17 and has an arc-shaped spline 22.
is the linear spline 23 of the spline hole 18
These joint mechanism 2 are slidably engaged with each other.
4.

Therefore, this joint mechanism 24 allows the steering shaft 17 of the steering column 15 to move up and down, and to move back and forth and left and right, so that the steering shaft 17 and the steering gear box 1
Absorbs the misalignment of 9.

Effects of the invention The fitting portion between the spline hole portion 18 and the crowned spline portion 21 absorbs vertical movement and longitudinal and horizontal movement of the steering shaft 17, and prevents misalignment between the steering shaft 17 and the steering gear box 19. can be absorbed.

In addition, a spline hole 18 is provided in the steering shaft 17, and the steering gear box 19 is
A crowned spline portion 21 is attached to the input shaft 20 of the
Since the number of parts is reduced, the parts cost can be reduced, and the assembly can be made by simply fitting the spline hole part 18 and the crowned spline part 21, so the assembly cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of an embodiment of the present invention, FIG. 2 is an explanatory diagram of the configuration of a joint mechanism, and FIG. 3 is an explanatory diagram of the configuration of a conventional steering device for an industrial vehicle. 15 is a steering column, 17 is a steering shaft, 19 is a steering box, 20
is an input shaft, and 24 is a joint mechanism.

Claims (1)

[Scope of Claim for Utility Model Registration] The upper part of a steering column 15 is supported on the dart board 13 of the driver's cab 12 using an adjustment fulcrum 16 so as to be adjustable back and forth, and a linear spline 23 is provided at the lower end of the steering shaft 17 of the steering column 15. The input shaft 20 of the steering gear box 19 provided on the side of the vehicle body frame 10 is provided with a crowned spline portion 21 having an arc-shaped spline 22. 21 and the steering hole 18 to connect a steering shaft 17 and an input shaft 20 of a steering gear box 19.