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Telescopic shaft

A telescopic shaft, female shaft technology, applied in the directions of shafts, bearings, couplings, etc., can solve the problems of stick-slip, inability to perform smooth sliding motion, etc., and achieve the effect of smooth sliding and minimizing deterioration.

Inactive Publication Date: 2006-08-23
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the coating is peeled off, the sliding motion cannot be performed smoothly, so stick-slip occurs, and this will be a major cause of unwanted chattering and abnormal noise

Method used

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  • Telescopic shaft
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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0088] figure 2 It is a longitudinal sectional view of the first embodiment of the vehicle steering telescopic shaft of the present invention.

[0089] image 3 It is a longitudinal sectional view of the first embodiment of the vehicle steering telescopic shaft of the present invention.

[0090] Figure 4 is along image 3 A transverse cross-sectional view taken along line IV-IV.

[0091] Such as figure 2 and 3 As shown, the telescopic shaft 10 includes a male shaft 1 and a female shaft 2, and the two shafts are slidably fitted together in a manner to prevent relative rotation to each other. Universal joints UJ are connected to male shaft 1 and female shaft 2 respectively.

[0092] Such as Figure 4 As shown, three axial grooves 3 are formed in the outer peripheral surface of the male shaft 1, and the three axial grooves are circumferentially spaced from each other at an angle of 120 degrees. Similarly, three axial grooves 5 are formed extending in the inner periphe...

no. 2 example

[0141] Figure 5A shows a second embodiment of the invention and is along image 3 A transverse cross-sectional view taken along line IV-IV. Figure 5B is an enlarged cross-sectional view showing a part of the outer surface of the columnar member.

[0142] In this embodiment, the inner peripheral surface of the female shaft 2 is subjected to surface hardening treatment, and thus the hard layer Ha is formed, as described in the above-mentioned first embodiment. It is not always necessary to subject the entire inner peripheral surface of the female shaft 2 to surface hardening treatment, but at least the inner surface of the axial groove 6 in contact with each needle roller (cylindrical member) 8 may be subject to surface hardening treatment, and the surface hardening treatment also Heat treatment may be applied to the surface of each column member 8, thereby forming the hard layer Hb thereon.

[0143]In addition to the hard layer Hb (a hard layer formed by surface hardening ...

no. 3 example

[0146] In the present embodiment, surface hardening treatment is applied on the inner peripheral surface of the female shaft 2, thereby forming the hard layer Ha, as described in the above first embodiment. It is not always necessary to subject the entire inner peripheral surface of the female shaft 2 to surface hardening treatment, but at least the inner surface of the axial groove 6 in contact with each needle roller (cylindrical member) 8 may be subject to surface hardening treatment, and the surface hardening treatment also Applicable to the inner surface of the axial groove 5 which is in contact with each row of rolling balls 7 . Surface hardening treatment may also be applied to the surface of each columnar member 8 by heat treatment, thereby forming a hard layer Hb thereon.

[0147] In addition to the hard layer Ha (a hard layer formed by surface hardening treatment, and its surface hardness is not less than Hv 400), the inner surface of each axial groove 6 on the femal...

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Abstract

A surface hardening treatment is applied to an inner peripheral surface of a female shaft 2, thereby forming a hard layer Ha thereon. Surface harness of the hard layer is 400 Hv or more. The thickness of the hard layer Ha is 10 m to 100 m, and for example gas nitrocarburizing treatment is performed as the surface hardening treatment. A surface hardening treatment is also applied to an outer surface of each cylindrical member 8 by a heat treatment, thereby forming a hard layer Hb thereon. With this construction, the inner peripheral surface of the female shaft is prevented from deformation and wear under a high contact pressure, so that the smooth sliding movement can be obtained.

Description

technical field [0001] The present invention relates to a telescopic shaft comprising a male shaft and a female shaft which are slidably fitted in such a way as to prevent relative rotation of the two, and more particularly to a telescopic shaft incorporated in a steering shaft of a vehicle Telescopic shaft for vehicles. Background technique [0002] The telescoping shaft of the steering mechanism part of the automobile should have the ability to absorb the axial displacement and develop during the running of the automobile so that the displacement and vibration are not transmitted to the steering wheel. In addition, the telescoping shaft should have the function of moving the steering wheel in the axial direction to adjust its position, whereby the driver can choose the most suitable position for driving the car. [0003] In each case, the telescoping shaft should reduce rattling noise, rattling feeling on the steering wheel and sliding resistance arising from axial slippa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C3/03F16D3/06C21D1/18C21D7/06B62D1/19B62D1/16
CPCB62D1/185F16C3/035F16D3/065F16C29/002F16C29/007F16C33/64F16C29/123F16C2326/24
Inventor 山田康久
Owner NSK LTD
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