Magnetic rotation sensor wherein a magnetic member is attached t

Details Magnetic rotation sensor wherein a magnetic member is attached t Magnetic rotation sensor wherein a magnetic member is attached t

1987-05-29

1989-04-11

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324173, 403273, G01P 348, F16B 400

Patent

active

048209783

ABSTRACT:
A rotation sensor for vehicle includes a drive shaft connected to a rotation shaft of a vehicle by a transmission member, a ring-shaped magnet member provided onto the drive shaft and a detector for detecting change of magnetic flux caused by rotations of the magnetic member, wherein rotation frequency or rotation speed can be measured by detecting the changes of the magnetic flux. The magnetic member is formed of a composition of heat resisting resin and magnetic materials, and the formed magnetic member is fixed to the drive shaft through a heat resistant elastic member. As a result, even if the rotation sensor is located in high temperature place, e.g. around an engine, there is no possibility that a crack in the magnet member will be caused since expansion or contraction in the magnetic member can be absorbed by the elastic member.

REFERENCES:
patent: 3786336 (1974-01-01), Lohr
patent: 4256348 (1981-03-01), Lester et al.
patent: 4321495 (1982-03-01), Kennedy
patent: 4631973 (1986-12-01), Eley

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