Electric Power Steering

A power steering device, electric technology, applied in power steering mechanism, electric steering mechanism, transmission device, etc., can solve problems such as abnormal noise or vibration, and achieve the effect of reducing vibration

CN103043093BActive Publication Date: 2015-08-05NSK LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-08-05

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    Figure 1
  • Figure 2
    Figure 2
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    Figure 3
Patent Text Reader

Abstract

Construction of an electric power-steering apparatus is achieved that, by stably suppressing backlash of an output shaft 6a of an electric motor 5 over a long period of time, is able to stably reduce vibration and strange noise that occurs during operation. The front end section of the output shaft 6a and the base end section of a worm 7 are connected such that torque can be transmitted and such that relative displacement in the axial direction is possible An elastic member 31 having an elastic force in a direction that separates the output shaft 6a and worm 7 is provided in the connecting section between the output shaft 6a and the worm 7. Due to the elastic force of the elastic member 31, together with the tandem arrangement contact angles, the preload is applied to a pair of ball bearings 14a, 14b that support the output shaft 6a with respect to the motor case 13 such that the output shaft 6a can rotate freely.
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Description

technical field

[0001] The present invention relates to an electric power steering device for automobiles. Background technique

[0002] In order to reduce the force required to operate the steering wheel when the steering angle is applied to the steering wheels of the car (except for special vehicles such as forklifts, usually the front wheels), electric power steering devices are widely used. Use an electric motor as an auxiliary power source. Although electric power steering apparatuses of various structures are known, in any of the structures, the auxiliary power of the electric motor is applied to the steering shaft rotated by the operation of the steering wheel via the speed reducer. A worm gear reducer is generally used as the reducer. In the case of an electric power steering system using a worm gear reducer, the auxiliary power of the electric motor is freely transmitted to the steering shaft by meshing a worm screw rotationally driven by the electric motor with a...

Examples

Embodiment Construction

[0038] The first example of embodiment

[0039] figure 1 as well as figure 2 The first example of the embodiment of the present invention is shown. In addition, this example is characterized by the following structure, that is, in order to prevent the output shaft 6a of the electric motor 5 from rattling, the structure for supporting the output shaft 6a rotatably with respect to the motor housing 13; The structure which freely supports the connection part of the front-end|tip part of the output shaft 6a and the base end part of the worm shaft 8 which comprises the worm 7. The structure and function of other parts are substantially the same as the conventional structure, so the description of the structure and function of the same part as the conventional structure will be omitted or briefly explained, and the characteristic parts of this example will be mainly described.

[0040] The electric power steering device of this example also has a housing 3 , a steering shaft 2 ...