Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1994-06-03
1996-06-04
O'Shea, Sandra L.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
32420725, 384448, 310168, 188181R, G01P 348, B60T 832
Patent
active
055236804
ABSTRACT:
A wheel speed sensor having a simple construction outputs a signal used for measuring the rotational speed of a wheel without noise due to displacement of rotating members. A housing is provided on a carrier member of a suspension mechanism, the carrier member carrying a bearing rotatably supporting a wheel shaft of the wheel. At least one fixed tooth is protrusively formed on an inner surface of the housing. An annular coil is arranged inside the housing. A rotatable yoke member is accommodated in the housing and is rotatable together with the wheel shaft. The rotatable yoke member comprises a shaft inserted into a center hole of the annular coil and an extending member extending in a radial direction. The shaft extends through the center hole of the annular coil so that a first gap is formed between an end of the shaft and a wall of the housing. At least one rotatable tooth is formed on an outer periphery of the extending member so that a second gap is formed between the rotatable tooth and the fixed tooth. A magnet is provided as a part of the shaft. Magnetic flux generated by the magnet forms a loop surrounding the annular coil by passing through the shaft, the extending member, the second gap, the housing and the first gap, so that a voltage signal having a periodical change corresponding to a rotational speed of the wheel is generated in the annular coil.
REFERENCES:
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patent: 3683219 (1972-08-01), Kruse
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patent: 4027753 (1977-06-01), Lantz
patent: 4157482 (1979-06-01), Kakinuma
patent: 4318018 (1982-03-01), Kennedy
patent: 4970462 (1990-11-01), Richmond
O'Shea Sandra L.
Patidar Jay M.
Toyota Jidosha & Kabushiki Kaisha
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