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Torque detection device and electric power steering apparatus

A technology of electric power steering and torque detection, applied in electric steering mechanism, measuring device, automatic steering control components, etc., can solve problems such as yoke leakage, and achieve the effect of improving torque detection ability and detection accuracy

Inactive Publication Date: 2013-05-08
JTEKT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, since the magnetic flux of the yoke easily leaks inadvertently from the acute-angled portion of the claw, it is difficult for the magnetic sensor to detect the magnetic flux density of the yoke with high precision.
That is to say, the torque sensor is not easy to detect the torque with high precision

Method used

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  • Torque detection device and electric power steering apparatus
  • Torque detection device and electric power steering apparatus
  • Torque detection device and electric power steering apparatus

Examples

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Embodiment Construction

[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0024] figure 1 It is a schematic diagram showing a schematic configuration of an electric power steering device 1 including a torque detection device 17 according to an embodiment of the present invention. The electric power steering device 1 has: a steering shaft 3 connected to a steering wheel 2; an intermediate shaft 5 connected to the steering shaft 3 via a universal joint 4; a pinion shaft 7 connected to the intermediate shaft 5 via a universal joint 6; A rack shaft 10 extending in the left-right direction of the vehicle includes a rack 9 that meshes with a pinion 8 provided at the tip of the pinion shaft 7 .

[0025] The rack shaft 10 is supported by a cylindrical housing 11 so as to be movable in the axial direction. Tie rods 12 are respectively connected to both ends of the rack shaft 10 , and each tie rod 12 is connected to a corresponding steered wheel 13 v...

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PUM

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Abstract

The invention provides a torque detection device and an electric power steering apparatus. The torque detection device (17) includes a torsion bar (16) that couples a first shaft (14) to a second shaft (15) such that the first shaft (14) and the second shaft (15) are rotatable relative to each other; an annular magnet (25) that is fixed to the first shaft (14); a pair of magnetic yokes (26) that are fixed to the second shaft (15) and that are arranged to face the magnet (25); and Hall ICs (30). Each of the magnetic yokes (26) has a plurality of lugs (41) arranged at equal intervals in a circumferential direction, and each lug (41) becomes narrower toward its distal end (41B), and has a curved profile (R) with rounded corners when viewed from a radial direction of the corresponding magnetic yoke (26).

Description

technical field [0001] The present invention relates to a torque detection device for detecting steering torque of a steering wheel, and an electric power steering device including the torque detection device. Background technique [0002] The torque sensor disclosed in US2004 / 0093961 is composed of the following: a torsion bar connecting the input shaft and the output shaft on the same shaft; a ring-shaped magnet installed at the end of the input shaft; a ring-shaped magnet installed at the end of the output shaft A ring-shaped yoke; and a magnetic sensor that detects the density of the magnetic flux generated by the yoke induced by a magnet, etc. On each yoke, the same number of claws as the N poles and S poles of the magnets are provided at equal intervals over the entire circumference. The magnetic sensor is inserted into a gap provided between a pair of axially opposed yokes, and detects the magnetic flux density of the yokes. [0003] When a torque (steering torque) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D6/10B62D5/04
CPCG01L3/104
Inventor 青木要
Owner JTEKT CORP
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