Brakes – Operators – Electric
Patent
1991-04-29
1992-09-08
Oberleitner, Robert J.
Brakes
Operators
Electric
188161, 188164, 188267, 310 93, 310105, B60L 728, F16D 6300
Patent
active
051450380
ABSTRACT:
An eddy current type retarder for a vehicle comprises a hollow rotor mounted on an engine-rotated shaft, a first stator mounted on a frame of the vehicle such that it faces an inner wall of the rotor, a first group of permanent magnets mounted on the first stator at intervals in the circumferential direction of the first stator with poles of the magnets being reversed alternately in the circumferential direction of the first stator, a second stator adapted to be movable relative to the first stator and provided near the first stator such that the second stator faces the inner wall of the rotor, a second group of permanent magnets mounted on the second stator at the same intervals as the first group of permanent magnets in the circumferential direction of the second stator with poles of the magnets being reversed alternately like the first group of magnets, a magnetic-passage-forming-ring provided between the rotor and the first and second stators, the ring having ferromagnetic elements which extend over the first group of permanent magnets and the second stator, an actuator for moving the second stator such that the poles of the magnets of the first group are indentical with the poles of the adjacent magnets of the second group during a brake applying operation and such that the former are opposite the latter during a brake releasing operation.
REFERENCES:
patent: 3062977 (1962-11-01), Reynst
patent: 3488535 (1970-01-01), Baermann
patent: 3601641 (1971-08-01), Baermann
Gossett Dykema
Isuzu Motors Limited
Oberleitner Robert J.
Poon Peter M.
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