Electric power steering system

A technology of electric power steering and steering shaft, which is applied in the direction of power steering mechanism, electric steering mechanism, electromechanical device, etc. It can solve the problems of reduced assembly workability of electric power steering device, reduced adaptability to electromagnetic environment, and changes in control accuracy, and achieves Improved electromagnetic environment adaptability, improved assembly workability, and reduced man-hours
CN101378944AInactive Publication Date: 2009-03-04NSK LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NSK LTD
Publication Date
2009-03-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

An electric power steering system in which assembling workability can be enhanced by reducing to a minimum required ground processing of each portion requiring grounding. The electric power steering system comprises a steering column (3) incorporating a steering shaft (2) to which steering torque is transmitted, and an electric motor (5) for transmitting a steering auxiliary power to the steering shaft (2) through the reduction mechanism in a reduction gear box (4), wherein a control unit (19) including substrates (23, 25) mounting a control circuit performing drive control on the electric motor is attached to the reduction gear box (4), the joint of the electric motor (5) is electrically connected with the control unit (19) directly, and connection of the reduction gear box (4) and the control unit (19) to the ground is made through a ground connection wire (29) arranged between the control unit (19) and a power supply section (30).
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Description

technical field

[0001] The present invention relates to an electric power steering apparatus having: a steering column housing a steering shaft to which steering torque is transmitted; and an electric motor which transmits steering power to the steering column through a reduction mechanism in a reduction gear box . Background technique

[0002] As a conventional electric power steering device, for example, Patent Document 1 (Japanese Patent Laid-Open No. 2005-329866), Patent Document 2 (Japanese Patent Laid-Open No. 2005-329867), Patent Document 3 (Japanese Patent Laid-Open No. 2005-329868 Publication) and Patent Document 4 (Japanese Patent Laid-Open No. 2005-329869), an electric power steering device is proposed in which a rack shaft or a steering gear A part of the housing that houses the motor and houses the control board that drives and controls the motor is formed on the rack case or the steering gear box. When the mounting boss (boss) at the bottom abuts, the board c...

Claims

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