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Telescopic shaft

A telescopic shaft and shaft center technology, which is applied to the steering column and the steering control installed on the car, etc., can solve the problems of insufficient removal of looseness, excessive sliding resistance, etc., and achieve the effect of not reducing the pre-pressure

Inactive Publication Date: 2008-01-02
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the removal of looseness in the bending direction (moment direction) is insufficient, and when the spring force is increased to eliminate looseness in the bending direction (moment direction), the sliding resistance becomes too large

Method used

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Examples

Experimental program
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Embodiment 1

[0068] FIG. 1 is a partially cutaway front view showing the entire steering device according to Embodiment 1 of the present invention, and shows an embodiment applied to an electric power steering device having a steering assist unit. Fig. 2 is a longitudinal sectional view of the main part of Fig. 1 .

[0069] Fig. 3 shows the telescoping shaft of embodiment 1 of the present invention, and Fig. 3 (A) is II-II enlarged sectional view of Fig. 2, and Fig. 3 (B) is the U portion enlarged sectional view of Fig. 3 (A). Fig. 4 is an enlarged sectional view showing only the male shaft and the female shaft with the sleeve removed from Fig. 3(A). Fig. 5 is an enlarged cross-sectional view showing a state before a sleeve is attached to the male shaft and fitted onto the female shaft in Fig. 3(A).

[0070] Fig. 6 is an enlarged cross-sectional view of the V part of Fig. 3(B). Fig. 6(A) shows the state where no rotational torque is loaded between the male shaft and the female shaft, and ...

Embodiment 2

[0136] Next, Embodiment 2 of the present invention will be described. Fig. 10 shows the telescopic shaft according to the second embodiment of the present invention, the male shaft, the female shaft and the sleeve are taken as cross-sections, corresponding to the enlarged cross-sectional view of II-II in Fig. 2 . In the following description, only the structural parts and functions different from those of the first embodiment will be described, and redundant description will be omitted. In addition, the same structures as those of the above-mentioned first embodiment are described with the same reference numerals.

[0137] Embodiment 2 is a modified example of Embodiment 1. The force applying sleeve part and the connecting sleeve part are made in a wave shape, the connecting sleeve part is in contact with the outer peripheral part of the male shaft 12B, and the force applying sleeve part is in contact with the female shaft sleeve part. The inner peripheral portions of 12A are...

Embodiment 3

[0144] Next, Embodiment 3 of the present invention will be described. Fig. 11 shows the telescopic shaft according to the third embodiment of the present invention, the male shaft, the female shaft and the sleeve are taken as cross-sections, corresponding to the enlarged cross-sectional view of II-II in Fig. 2 . In the following description, only structural parts and functions different from those of the above-mentioned embodiments will be described, and repeated descriptions will be omitted. In addition, the same reference numerals are assigned to the same configurations as those of the above-mentioned embodiments and described.

[0145] Embodiment 3 is a modified example of Embodiment 1. The connecting sleeve part is in a wave shape, and the connecting sleeve part is in contact with the inner circumference of the female shaft 12A. There is always a gap in between.

[0146] That is, in Example 3, the shape of the urging sleeve part 713 is the same as that of Example 1, and ...

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Abstract

This invention provides a telescopic shaft in which a backlash or a sliding resistance in a rotational direction is maintained to a predetermined value even when there are fabrication errors in a male shaft and a female shaft, and a preload is not reduced even when a sleeve is worn by a friction force in sliding, and a steering apparatus having the telescopic shaft. An inclined sleeve portion 712 is pressed by an elastic deformation of an urge sleeve portion 713, so that there is not backlash between a male shaft 12B and a female shaft 12A and a predetermined preload is applied. Although an outer periphery of the inclined sleeve portion 712 is worn by a friction in sliding, the inclined sleeve portion 712 is further pressed by an elastic force of the urge sleeve portion 713 by an amount of wearing the outer periphery of the inclined sleeve portion 712. Thus, a predetermined urge force is always operated to the inclined sleeve portion 71.

Description

[0001] References to related applications [0002] This application is based upon and claims the benefit of prior Japanese Patent Applications No. 2006-180318 filed on June 29, 2006 and No. 2007-078876 filed on March 26, 2007, the entire contents of which are incorporated herein by reference. technical field [0003] The invention relates to a telescopic shaft. In particular, the present invention relates to a telescoping shaft capable of transmitting rotational torque and relatively movable in a shaft direction, such as a telescoping shaft of an intermediate shaft or a steering shaft. In addition, the invention relates to a steering device with a telescoping shaft. Background technique [0004] In a steering device, telescopic shafts that can transmit rotational torque and are connected so as to be relatively movable in the axial direction are assembled into an intermediate shaft, a steering shaft, or the like. That is, the intermediate shaft needs to have a telescopic fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D1/18
Inventor 黑川祥史
Owner NSK LTD
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