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Rotation transmission mechanism and electric power steering device

A technology of electric power steering and rotation transmission, applied in power steering mechanism, steering mechanism, electric steering mechanism, etc., can solve the problems of cost increase and addition, etc.

Inactive Publication Date: 2014-02-19
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of this structure, a heat treatment process that was not used in the conventional process is added, and there is a possibility that the material suitable for heat treatment may be changed, and the cost may increase

Method used

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  • Rotation transmission mechanism and electric power steering device
  • Rotation transmission mechanism and electric power steering device
  • Rotation transmission mechanism and electric power steering device

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Embodiment Construction

[0031] Hereinafter, a rotation transmission mechanism and an electric power steering device according to an embodiment of the present invention will be described with reference to the drawings. figure 1 It is a cross-sectional view showing a main part of the rotation transmission mechanism according to the first embodiment of the present invention. The rotation transmission mechanism of this embodiment is applied to, for example, the input side shaft 2 and the output side shaft 3 of an electric power steering apparatus. A steering wheel of an electric power steering device is integrally attached in a rotational direction to a right end portion (not shown) of the input side shaft 2 . A pinion shaft is connected to the left end portion of the output side shaft 3 (not shown), and this pinion shaft constitutes a rack and pinion steering device of the electric power steering system. The input-side shaft 2 is rotatably supported by a rolling bearing (not shown) relative to the hous...

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PUM

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Abstract

Provided are an electric power steering device and a rotation transmission mechanism having a split structure and enabling a reduction in processing costs. For example, when connecting, by means of a torsion bar (4), an input side shaft (first rotating shaft) (2) and an output side shaft (second rotating shaft) (3), positioned on the same axis in an electric power steering device, the input side shaft (2) is configured as a several-portion connection structure that is split into a torsion bar interlocking section (20a) which is a common portion that can be commonly used in different products, and a connection section (20b) which is a specialized-portion for a specific product. The torsion bar interlocking section (20a) and the connection section (20b) are joined by means of serration press-fitting; and a thin-walled section (23a), which serves as a swage section, is provided to the torsion bar interlocking section (20a) (or the connection section (20b)), the thin-walled section (23a) being swaged to the connection section (20b) (or the torsion bar interlocking section (20a)) and serving as a backup for the serration press-fitting.

Description

technical field [0001] The present invention relates to a shaft used in a rotation transmission mechanism, and in particular to a steering main shaft of an electric power steering device having a telescoping sliding portion, an elliptical fitting portion, a sensor for detecting assist torque, and a mechanism for holding a torsion bar. Background technique [0002] A conventional electric power steering device has a configuration such as that described in Patent Document 1 below: an input-side shaft connected to a steering wheel using a low-rigidity shaft (torsion bar), and a rack and pinion mechanism (rack and pinion) The output side shaft connected with the steering gear mechanism is connected. A motor for assisting torque is connected to the output shaft, and a torque sensor is used to detect the twisting amount of the torsion bar, and the assisting torque corresponding to the detected twisting amount of the torsion bar is calculated, and the assisting torque is generated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16D1/02B62D5/04
CPCG01L3/104F16D1/02F16D1/072G01L5/221F16D1/0894F16D1/027B62D5/0409
Inventor 万雄介岩崎康浩渡边靖藤田哲英儿玉徹也
Owner NSK LTD