Rotational speed detector for vehicle wheel with sensor device a

Details Rotational speed detector for vehicle wheel with sensor device a Rotational speed detector for vehicle wheel with sensor device a

1997-05-27

2000-04-25

Oda, Christine K.

Measuring and testing

Speed, velocity, or acceleration

Magnetic speed measuring or mechanical speed measuring with...

324174, G01P 342

Patent

active

060530464

ABSTRACT:
A detector detects a rotational speed of a rotating object. The detector includes a closed magnetic circuit having a magnet therein, and detects the rotational speed according to a magnetic flux alteration in the closed magnetic circuit. The detector comprises a cylindrical rotor switch, which rotates together with the rotating object, and a fixed sensor device having a magnet, an electromagnetic coil and claws constituting a magnetic switch. At least two magnetic switches are provided in the closed magnetic circuit in order to increase the flux alteration in the circuit and thereby to enhance a detection accuracy.

REFERENCES:
patent: 3793545 (1974-02-01), Leiber et al.
patent: 3870911 (1975-03-01), Toyama et al.
patent: 3928802 (1975-12-01), Reinecke
patent: 4259603 (1981-03-01), Uchiyama et al.
patent: 4268771 (1981-05-01), Lace
patent: 4435659 (1984-03-01), Peterson

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