Electric power steering device

An electric power steering and steering shaft technology, which is applied to power steering mechanism, electric steering mechanism, automatic steering control components, etc., can solve the problem that the bending moment cannot be offset, the accuracy of the magnetostrictive torque sensor is reduced, and the steering torque detection accuracy Lowering and other issues to achieve the effect of improving steering feel

CN104684790AActive Publication Date: 2015-06-03HONDA MOTOR CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-06-03

Smart Images

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

Abstract

A column-assist type electric power steering device (10) is provided with: a steering shaft (22); a magnetostrictive type torque sensor (80) that detects a torque produced in the steering shaft (22); and bearings (64, 65) that rotatably support the steering shaft (22). The magnetostrictive type torque sensor (80) includes a magnetostrictive film (81) disposed on an outer peripheral surface of the steering shaft (22), and a detection unit (83) that is disposed opposite the magnetostrictive film (81) and that detects a change in permeability. The bearings (64, 65) are installed at two locations in the axial direction of the steering shaft (22) in such a manner as to sandwich the detection unit (83).
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Description

Technical field

[0001] The invention relates to an improved electric power steering device. Background technique

[0002] Electric power steering is used in the steering system of most vehicles. An electric power steering device is a device that reduces the driver's steering force when the driver rotates the steering wheel, thereby giving the driver a comfortable steering feeling.

[0003] This electric power steering device has a rotation torque detection mechanism. The rotation torque detection mechanism is a device that detects the magnitude and direction of the rotation torque (steering torque) acting on the steering system of the vehicle when the driver rotates the steering wheel. An assist torque is generated by the electric motor based on the detection result detected by the rotation torque detection mechanism, and the assist torque is applied to the steering system.

[0004] In particular, an electric power steering device that transmits assist torque to a steering shaft i...

Examples

Embodiment 1

[0045] based on figure 1 The structure of a column-assisted electric power steering device equipped with the rotation torque detection device of the first embodiment will be described.

[0046] Such as figure 1 As shown, the steering column-assisted electric power steering device 10 (hereinafter referred to as "electric power steering device 10".) includes a steering system 20 from the steering wheel 21 of the vehicle to the steering wheels 29, 29 (for example, front wheels) of the vehicle and steering The steering system 20 applies an assist torque mechanism 40 to assist torque.

[0047] In the steering system 20, a pinion shaft 24 is connected to the steering wheel 21 via a steering shaft 22 (shaft 22) and universal joints 23, 23, and a rack and pinion shaft 24 is connected to the pinion shaft 24 via a rack and pinion mechanism 25 The shaft 26 is connected to left and right steered wheels 29 and 29 via left and right tie rods 27 and 27 and knuckles 28 and 28 at both ends of the r...

Embodiment 2

[0088] Next, the second embodiment of the present invention will be described based on the drawings.

[0089] Figure 5 (a) shows the cross-sectional structure of an electric power steering device equipped with the rotation torque detection device of the second embodiment. figure 2 Represented accordingly. Compared with the electric power steering device of the first embodiment, the number of bearings arranged at one location is changed.

[0090] Such as Figure 5 As shown in (a), in the electric power steering device 10A of the second embodiment, the first bearings 64A and 64A are composed of a plurality of single row rolling bearings continuously mounted along the steering shaft 22. In the electric power steering device 10B formed in this way, the effects prescribed by the present invention can also be obtained.

[0091] Also refer to Figure 5 (b) There are a plurality of first bearings 64A, 64A arranged. As a result, the amount of deflection of the steering shaft 22 with respe...

Embodiment 3

[0093] Next, the third embodiment of the present invention will be described based on the drawings.

[0094] Image 6 (a) shows the cross-sectional structure of an electric power steering device equipped with the rotation torque detection device of Example 3, which is similar to the above figure 2 Represented accordingly. Compared with the electric power steering system of the first embodiment, the number of bearings arranged at one location is changed.

[0095] Such as Image 6 As shown in (a), in the electric power steering apparatus 10B of the third embodiment, the second bearings 65B and 65B are composed of a plurality of single row rolling bearings continuously mounted along the steering shaft 22. In the electric power steering device 10B formed in this way, the effects prescribed by the present invention can also be obtained.

[0096] Also refer to Image 6 (b) A plurality of second bearings 65B and 65B are arranged. As a result, the amount of deflection of the steering shaf...