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Torque detecting apparatus and electric power steering apparatus

A technology of torque detection and detector, which is applied in the direction of electric steering mechanism, measuring device, torque measurement, etc., can solve the problems of increasing the number of components, increasing the cost of components, and not being able to guarantee the mechanical adhesion of the circuit board, so as to reduce the The effect of reducing the number of parts and the cost of parts

Inactive Publication Date: 2008-12-31
JTEKT CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, there is a problem that the synthetic resin used in the first molding cannot guarantee the mechanical adhesion to the circuit board, and if it is heated several times and stretched repeatedly, the synthetic resin will peel off from the circuit board, etc., such as figure 2 As shown, a gap 30 is produced between the synthetic resin and the circuit board 19
[0010] In addition, in the above-mentioned torque sensor, wiring and connector parts for connecting to the control unit of the electric power steering device are required, and there is a problem that the cost of parts increases and the number of parts increases.

Method used

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  • Torque detecting apparatus and electric power steering apparatus
  • Torque detecting apparatus and electric power steering apparatus
  • Torque detecting apparatus and electric power steering apparatus

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Embodiment approach 1

[0047] 3A to 3C are explanatory views showing the configuration of Embodiment 1 of the torque detection device of the present invention. Fig. 3A is an exploded perspective view, Fig. 3B is a longitudinal sectional view, and Fig. 3C is a cross-sectional body of the A-A' plane of Fig. 3B. In this torque detection device, an input shaft 1 (first shaft) and an output shaft (second shaft) are coaxially connected via a small-diameter torsion bar 3 (connecting shaft). The input shaft 1 and the output shaft 2 are respectively connected to the torsion bar 3 via pins 9 .

[0048] A cylindrical permanent magnet 5 (24 poles) is coaxially fixed to the input shaft 1, and the permanent magnet 5 magnetizes 24 poles (12 poles each for N and S poles) at equal intervals in the circumferential direction. On the output shaft 2, through the shaft sleeve 25 ( Figure 5 ), coaxially press into the fixed cylindrical yoke 4, and the yoke 4 surrounds the permanent magnet 5 with an appropriate gap in t...

Embodiment approach 2

[0066] 7A to 7C are explanatory views showing the configuration of Embodiment 2 of the torque detection device of the present invention. Fig. 7A is an exploded perspective view, Fig. 7B is a longitudinal sectional view, and Fig. 7C is a cross-sectional body of the A-A' plane of Fig. 7B. In this torque detection device, an input shaft 1 (first shaft) and an output shaft (second shaft) are coaxially connected via a small-diameter torsion bar 3 (connecting shaft). The input shaft 1 and the output shaft 2 are respectively connected to the torsion bar 3 via pins 9 .

[0067] On the input shaft 1, a cylindrical permanent magnet 5 (24 poles) is fixed coaxially, and the permanent magnet 5 magnetizes 24 poles (12 poles each for N and S poles) at equal intervals in the circumferential direction. A cylindrical yoke 4 is press-fitted coaxially onto the output shaft 2 and fixed, and the yoke 4 surrounds the permanent magnet 5 with an appropriate gap in the radial direction. Yoke 4, such ...

Embodiment approach 3

[0074] 10A to 10C are explanatory diagrams schematically showing the configuration of Embodiment 3 of the torque detection device of the present invention. Fig. 10A is an exploded perspective view, Fig. 10B is a longitudinal sectional view, and Fig. 10C is a cross-sectional body on the A-A' plane of Fig. 10B. In this torque detection device, an input shaft 1 (first shaft) and an output shaft (second shaft) are coaxially connected via a small-diameter torsion bar 3 (connecting shaft). The input shaft 1 and the output shaft 2 are respectively connected to the torsion bar 3 via positioning pins 9 .

[0075] A cylindrical permanent magnet 5 (24 poles) is coaxially fixed to the input shaft 1, and the permanent magnet 5 magnetizes 24 poles (12 poles each for N and S poles) at equal intervals in the circumferential direction.

[0076] A cylindrical yoke 4 is press-fitted coaxially onto the output shaft 2 and fixed, and the yoke 4 surrounds the permanent magnet 5 with an appropriate ...

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Abstract

The invention provides torque detecting apparatus and electric power steering apparatus. The torque detecting apparatus comprises a first shaft and a second shaft connected coaxially to each other through a connecting shaft, a permanent magnet fixed to the first shaft, a plurality of soft magnetic members having a collar provided therein, fitted by pressing with the second shaft and disposed in a magnetic field of the permanent magnet to form a magnetic circuit, and a detector for detecting magnetic flux generated from the soft magnetic members, wherein the soft magnetic members are integrally molded with a mold body made of synthetic resin, and when a torque is applied to the first shaft or the second shaft, the torque is detected based on an output of the detector. The collar is made of a non-magnetic material.

Description

technical field [0001] The present invention relates to a torque detection device, which is particularly suitable for use in electric power steering devices of vehicles, etc., comprising: a first shaft and a second shaft coaxially connected by a connecting shaft, and a permanent magnet fixed to the first shaft , a plurality of soft magnetic bodies that are fixed on the second shaft and arranged in the magnetic field of the permanent magnet to form a magnetic circuit through the sleeve, and a detector that detects the magnetic flux induced by the soft magnetic body. The plurality of soft magnetic bodies are synthesized The resin mold is integrally formed, and when torque is applied to the first shaft or the second shaft, this torque detection device detects torque based on the output of the detector. [0002] In addition, the present invention relates to a torque detection device, which is particularly suitable for use in electric power steering devices of vehicles, etc., and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L3/10B62D5/04
Inventor 石原繁晴和泉武士德本欣智辻本泰介中根直树
Owner JTEKT CORP
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