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

Inactive Publication Date: 2009-03-04
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In this way, in the column-type electric power steering device, since both the steering column case and the control circuit need to be grounded, the assembly workability of the electric power steering device is reduced, and since the grounding of the two paths The wires are wired to different parts of the vehicle, and there will be relative potential differences, and there will be unsolved problems such as a decrease in electromagnetic environment compatibility (EMC) or fluctuations in control accuracy due to ground potential differences.

Method used

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  • Electric power steering system
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Examples

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Embodiment Construction

[0054] Embodiments of the present invention will be described below with reference to the drawings.

[0055] figure 1 It is a perspective view showing an example of applying the first embodiment of the present invention to a right-hand steering vehicle, figure 2 is the front view, Figure 3 is the left side view, Figure 4 is a top view, Figure 5 with Image 6 It is an exploded perspective view of the main part.

[0056] exist figure 1 Among them, 1 is a column-type electric power steering device, and a steering shaft 2 connected to a steering wheel (not shown) is rotatably built in a steering column 3, and a reduction gear box 4 is connected to the steering column 3. The reduction gear box 4 is provided with an electric motor 5 constituted by a brush motor, and the axial direction of the electric motor 5 extends in a direction perpendicular to the axial direction of the steering column 3 .

[0057] Here, the steering column 3 has a double-tube structure with an inner t...

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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).

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D5/04H02K7/16
CPCH02K5/225H02K11/0073H02K7/06B62D5/0406H02K7/1166H02K11/33
Inventor 关根孝明兵头直树樫本圭司
Owner NSK LTD
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