CN203946157U - The tween drive shaft that steering hardware is used - Google Patents

Abstract

The utility model relates to an intermediate shaft used in a steering device of an automobile, which at least has a fitting part of an outer spline shaft and an inner spline shaft. The feature of the intermediate shaft is that the end of the outer spline shaft and the inner Both ends of the spline shaft are chamfered. Thereby, the expansion and contraction operation of the expansion and contraction shaft becomes smoother.

Description

Intermediate shaft for steering gear

technical field

The utility model relates to an intermediate shaft used in a steering device of an automobile.

Background technique

In the intermediate shaft, the outer shaft and the inner shaft are spline-fitted. If the precision of the spline is poor, the telescopic movement may not be performed smoothly, and further improvement is required.

Utility model content

The utility model provides an intermediate shaft for a steering device, which at least has a fitting part of an external spline shaft and an internal spline shaft. On both sides of the department, there are chamfers. More preferably, both the external spline shaft and the internal spline shaft are chamfered by chamfering before the spline processing. Accordingly, the dimensional accuracy of the spline can be improved, and smoother expansion and contraction or smoother assembly can be realized.

Description of drawings

FIG. 1 shows a typical steering mechanism of an automobile.

Figure 2 shows the splined shaft forming the telescoping shaft.

Detailed ways

FIG. 1 shows a steering mechanism unit 15 of a general automobile. The steering mechanism unit 15 includes: a steering column 4 mounted on the vehicle body side member 1 via an upper bracket 2 and a lower bracket 3; a steering shaft 5 rotatably supported on the steering column 4; steering wheel 6 at the upper end of the steering shaft 5; an intermediate shaft 8 connected to the lower end of the steering shaft 5 via a universal joint 7; and a pinion shaft 10 connected to the intermediate shaft 8 via a universal joint 9 a steering rack shaft 11 connected to the pinion shaft 10 ; and a steering rack support member 14 that supports the steering rack shaft 11 and is fixed to another frame 12 of the vehicle body via an elastic body 13 .

The intermediate shaft 8 is a telescopic shaft (hereinafter referred to as telescopic shaft 8 ) in which an external spline shaft 8 a and an internal spline shaft 8 b are fitted together. The telescopic shaft 8 is required to absorb the axial displacement generated when the vehicle is running and not transmit the displacement and vibration to the steering wheel 6 .

Such performance is required in the case of a structure in which the vehicle body is a sub-frame structure, and the member 1 fixing the upper part of the steering mechanism portion 15 and the frame 12 to which the steering rack support member 14 is fixed are independent, In addition, the steering rack supporting member 14 is fastened and fixed to the vehicle frame 12 via an elastic body 13 such as rubber.

In other cases, when the cardan joint 9 is fastened to the pinion shaft 10 , a telescoping function is required in order to fit and fasten the telescoping shaft 8 to the pinion shaft 10 once the operator contracts the telescopic shaft 8 .

Furthermore, the steering shaft 5 positioned on the upper portion of the steering mechanism unit 15 is also a member in which an outer spline shaft 5 a and an inner spline shaft 5 b are fitted together (hereinafter referred to as telescopic shaft 5 ). The telescopic shaft 5 is required to move the position of the steering wheel 6 in the axial direction to adjust its position in order to ensure the best driving posture of the driver when driving the car. Therefore, the telescopic function in the axial direction is required.

Fig. 2 shows a state where the telescopic shaft 8 is separated into an outer spline shaft 8a and an inner spline shaft 8b. Splines 62 are formed over the entire axial length of the cylindrical portion 61 on the inner periphery of the inner spline shaft 8b. On the outer periphery of the external spline shaft 8a, a spline 64 is formed in a portion in the axial direction, that is, between the end portion 11a and the intermediate portion 11b. The illustrated external spline shaft 8a is a solid shaft.

Ends 62a, 62b of the splines 62 of the inner spline shaft 8b and ends 64a, 64b of the splines 64 of the outer spline shaft 8a are provided with chamfers 66a, 66b, 67a, 67b. The illustration shows so-called C chamfering (straight chamfering), but R chamfering (circular chamfering) is also possible. In addition, the angle of chamfering is not limited to 45 degrees.

In addition, these chamfers 66a, 66b, 67a, 67b are obtained by chamfering before forming the splines 62, 64, respectively. By chamfering before so-called spline machining, the dimensional accuracy of the formed spline can be improved. Accordingly, the expansion and contraction operation of the expansion and contraction shaft 8 becomes smoother.

In addition, although the telescopic shaft is shown in figure, the structure of this invention can also be applied to the intermediate shaft which does not expand and contract normally but shortens only when an excessive load, such as a collision, is applied. In this case, the assembly of the shaft becomes easier.

Claims (1)

1. the tween drive shaft that steering hardware is used, at least has the fitting portion of male splined shaft and female splined shaft, and this tween drive shaft is characterised in that, on the end of male splined shaft and these both sides of the end of female splined shaft, to have chamfering.