JPS6040384Y2 - Connection device between steering shaft and gearbox drive shaft - Google Patents

Description

[Detailed description of the invention] The present invention provides a clearance forming hole at the lower end of the female serration at the lower end of the steering shaft, and when the engagement between the steering shaft and the male serration of the pinion shaft below it is shallow, This invention relates to a coupling device for a steering shaft and a drive shaft on a gearbox side, which prevents serration coupling between the steering shaft and the gearbox.

The lower end of the steering shaft and the pinion shaft below it are connected by providing a female serration at the lower end of the steering shaft, a male serration at the upper end of the pinion shaft, and fitting these serrations together. It is possible to do so.

In such a shaft coupling device, it is desirable that both serrations be deeply fitted, but rotational force can be transmitted even if both serrations are shallowly fitted.

For this reason, even if the two serrations are shallowly fitted during assembly, it may not be noticed whether or not the two serrations are fitted in a desirable state.

However, in the case of shallow fitting like this, if the steering shaft is suddenly rotated due to sudden steering wheel operation while driving, the fitting part of both serrations will break and the steering wheel will spin, creating a dangerous situation. There's a problem.

The object of the present invention is to provide a coupling device between a steering shaft and a drive shaft on the gearbox side, which solves this problem.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a steering shaft, 2 is a pinion shaft disposed below the steering shaft 1, and 3 is a gear box that rotatably supports the pinion shaft 2. In FIG.

A connecting cylinder 5 is integrally attached to the lower end of the steering shaft 1 via a rubber flange joint 4.
Female serrations 6 are formed on the inner surface of this connecting cylinder 5.

The female serrations 6 are fitted into the male serrations 7 at the upper end of the pinion shaft 2 (
(See Figure 2).

A slit 8 extending in the axial direction is formed in the connecting cylinder 5, and a notch 9 for inserting a tightening bolt is formed in the male serration 7.
is formed.

10 is a tightening bolt.

This tightening bolt 10 has a slit 8 and a female serration 6.
It straddles the connecting tube 5 and passes through it.

A clearance forming hole 11 having a diameter larger than the diameter of the male serration 7 is formed at the lower end of the connecting cylinder 5 .

The depth of the clearance forming hole portion 11 is set to such a depth that both serrations 6.7 do not connect when the tip of the male serration 7 is in contact with the tightening bolt 10 as shown in FIG.

According to the present invention, as shown in Fig. 3, even if the steering shaft and pinion shaft are incorrectly assembled so that they are shallowly engaged, the male serrations on the steering side and the female serrations on the pinion shaft side Serrations cannot be combined with serrations.

In this case, when the steering shaft is rotated, the steering shaft rotates idly, so that incorrect assembly of the steering shaft and pinion shaft can be immediately detected and reassembled at the correct depth.

Therefore, according to the present invention, it is possible to prevent a dangerous situation that may occur due to the shallow serration coupling depth between the steering shaft and the pinion shaft.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of a coupling device for a steering shaft and a drive shaft on the gear box side, showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 FIG. 2 is a cross-sectional view showing an incorrectly assembled state of the coupling device shown in FIG. 1; 1... Steering shaft, 2...
Pinion shaft, 6...Female serration, 7
...Male serration, 8...Slit, 9...Notch, 10...Tightening bolt,
11... Gap formation hole.

Claims (1)

[Scope of utility model registration request] Female serrations are provided at the lower end of the steering shaft,
The lower pinion shaft of the steering shaft is provided with male serrations that fit into the female serrations, a part of the male serrations is provided with a notch for inserting a tightening bolt, and the part of the steering shaft where the female serrations are provided is provided with a notch in the axial direction. A tightening bolt for tightening the serrations is passed through the slit and the female serrations, and a clearance forming hole portion having a diameter larger than that of the male serrations is provided at a lower end of the female serrations than the tightening bolts. A coupling device for a steering shaft and a drive shaft on a gearbox side, characterized in that it is provided with a drive shaft.