ELECTRIC POWER STEERING DEVICE

Title:

ELECTRIC POWER STEERING DEVICE

Document Type and Number:

WIPO Patent Application WO/2003/047948

Kind Code:

A1

Abstract:

An electric power steering device, comprising a housing, a motor fitted to the housing and transmitting an auxiliary steering force to a rotating shaft through a motor shaft, a worm formed in or externally fitted to the rotating shaft and having a gear part formed of a metal or a resin, rolling bearings disposed in the housing at both side positions of the worm and rotatably supporting the rotating shaft, an output shaft transmitting a steering force for steering an axle and pivotally supported on the housing at a specified position, a worm wheel formed in or externally fitted to the output shaft so as to be meshed with the worm and having a gear part formed of a resin, and a pressurization mechanism for providing a pre−load in the direction of the worm wheel to the shaft end part of the rotating shaft apart from the motor, whereby the simple electric power steering device capable of eliminating the presence of backlash and capable of reducing tooth hitting noise without impairing a power transmission performance can be provided.

Inventors:

EDA HIROSHI (JP)
SEGAWA TORU (JP)

Application Number:

PCT/JP2002/012651

Publication Date:

June 12, 2003

Filing Date:

December 03, 2002

Export Citation:

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Assignee:

NSK LTD (JP)
EDA HIROSHI (JP)
SEGAWA TORU (JP)

International Classes:

B62D5/04; F16C25/08; F16C27/06; F16C35/073; F16C35/077; F16H1/16; F16H55/06; F16H55/22; F16H57/12; (IPC1-7): B62D5/04; F16H1/16; F16H55/24

Foreign References:

JP2001322554A	2001-11-20
JPH1143062A	1999-02-16
JP2001315653A	2001-11-13
JP2002266987A	2002-09-18
JP2001233225A	2001-08-28
JP2001010512A	2001-01-16
JP2001270448A	2001-10-02
DE10122434A1	2001-11-15

Other References: