Vehicle steering telescopic shaft

Abstract

A telescopic shaft for vehicle steering which is assembled in a steering shaft of a vehicle and in which a male shaft 1 and a female shat 2 are fitted to each other to be unrotatable and slidable, comprises torque transmitting portions respectively provided in an outer peripheral portion of the male shaft 1 and in an inner peripheral portion of the female shaft 2 for transmitting torque when they are mutually in contact to rotate; and preloading portions each consisting of a rolling member 7 provided between the outer peripheral portion of the male shaft 1 and the inner peripheral portion of the female shaft 2 at a position different from that of the torque transmitting portion for rotating when the male shaft and the female shaft are relatively moved in the axial direction and an elastic member 8 provided adjacently to the rolling member 7 in the radial direction for applying preload on the male shaft 1 and the female shaft 2 through the rolling member 7.

Description

technical field [0001] The invention relates to a telescoping shaft for vehicle steering. Background technique [0002] Traditionally, the steering mechanism of a vehicle uses a telescopic shaft formed by a male shaft splined with a female shaft as a part of the steering mechanism to absorb axial movement that occurs when the vehicle is running so that the movement or vibration will not be transmitted to the steering mechanism. on the steering wheel. It is required to reduce the backlash / backlash noise of the spline part on the telescopic shaft, reduce the backlash feeling on the steering wheel, and reduce the sliding resistance when sliding in the axial direction. [0003] Based on the above reasons, nylon film is coated on the spline part of the male shaft of the telescopic shaft, and lubricating oil is also coated on the sliding part to absorb or alleviate metal noise, metal knocking sound, etc., and at the same time reduce sliding resistance and reduce Play in the dire...

AI Technical Summary

Problems solved by technology

Also, the rails or bushes that are in contact with the balls need to have sufficient hardness / rigidity to withstand torque transmission, which is very unfavorable for processing, resulting in increased processing costs

Moreover, there are also disadvantages that it is difficult to miniaturize as a telescopic shaft for vehicle steering, and it is difficult to have a sufficient crushing / crushing stroke when a vehicle collides

In addition, since the arrangement is constituted only by balls, the sliding load fluctuates, and as a telescopic shaft for vehicle steering, it also exhibits the disadvantage of undesired characteristics.

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