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Angle sensor which makes it possible to prevent rattling caused by backlash between gears inside the angle sensor
| Details |
Inventors: Okumura, Hirofumi;
Assignee: Alps Electric Co., Ltd. (Tokyo, JP)
Primary Examiner: Enad; Elvin
Assistant Examiner: Lee; Kyung S.
Attorney, Agent or Firm: Brinks Hofer Gilson & Lione
An angle sensor in which, when a biasing member is used, a biasing force in the .beta.2 direction acts on a driving gear, and a biasing force in the .beta.1 direction acts on an auxiliary gear. This prevents backlash from occurring between a rotary member and the driving member, making it possible to reduce rattling between the rotary member and the driving member. A fitting member is provided at the free end side of a resilient supporting member in order to resiliently press a screw shaft in the Z1 direction. Therefore, internal threads of inside surfaces of corresponding fitting portions of the fitting member and thread grooves of the screw shaft can be made to uniformly closely contact each other, making it possible reduce rattling caused by backlash therebetween. Consequently, the angle of rotation of a steering wheel which is mounted to the rotary member is detected with high precision. |
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DETAILED DESCRIPTION To overcome the aforementioned conventional problems, it is an object of the present invention to provide an angle sensor which can detect the angle of rotation of a rotary member with high precision as a result of decreasing backlash between a driving gear and a gear of the rotary member.
It is also another object of the present invention to provide an angle sensor in which a detecting member which reciprocates in accordance with the rotation of a screw shaft is advanced with high precision.
To these ends, according to a first aspect of the present invention, there is provided an angle sensor for detecting an angle of rotation of a first rotary shaft by a detecting operation of a detecting portion.
The angle sensor comprises a first gear which rotates in accordance with the first rotary shaft, a second rotary shaft which extends in a direction perpendicular to the first rotary shaft, a second gear which rotates along with the second rotary shaft and which engages the first gear, a third gear which is rotatably provided at the second rotary shaft and which engages the first gear, and the detecting portion which detects the rotation of the second rotary shaft.
In the angle sensor, the first gear engages the second gear and the third gear in a screw gear relationship, and a biasing member is provided at the second rotary shaft.
The biasing member causes a tooth of the first gear to be sandwiched between a tooth of the second gear and a tooth of the third gear.
In one form of the first aspect of the invention, the biasing member may exert a biasing force onto the second gear in a direction of rotation thereof.
It another form of the first aspect of the invention, the biasing member may exert a biasing force in a direction in which the second gear approaches the first gear.
In the invention, the second gear (that is, a driving gear) and the third gear (that is, an auxiliary gear) are disposed at the first gear (that is, a rotary member) through the biasing member, so that a tooth of the second gear as well as a tooth of the third gear resiliently presses against a tooth of the first gear
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