192 clutches and power-stop control – Clutches – Operators
Patent
1988-09-09
1990-01-30
Braun, Leslie A.
192 clutches and power-stop control
Clutches
Operators
192 82T, 335279, F16D 2710
Patent
active
048967564
ABSTRACT:
An electromagnetic clutch according to the invention includes a first rotatable member having an axial end plate of magnetic material and a second rotatable member. The second rotatable member includes a drive shaft, and a hub mounted on an end of the shaft. An annular armature plate is disposed on an outer peripheral portion of the hub facing the axial end plate of the first rotatable member with an axial air gap therebetween. An electromagnetic device is disposed within the first rotatable member for attracting the armature plate to the axial end surface of the first rotatable member. The armature plate is elastically connected with the hub by a plurality of leaf springs and is made of materials with a low Curie point. Meltable elements are disposed on the armature plate to define the axial air gap between the first rotatable member and the armature plate. When the elements are heated sufficiently due to frictional heat, they melt and the air gap between the first rotatable member and the armature plate increases to a point where the clutch cannot be engaged. If the temperature exceeds the Curie point, the magnetic property of the armature decreases rapidly and the armature separates from the rotor and remains separated until the meltable elements are replaced.
REFERENCES:
patent: 2919777 (1960-01-01), Walter
patent: 3917041 (1975-11-01), Walberg
patent: 4236621 (1980-12-01), Mukai et al.
patent: 4243128 (1981-01-01), Shirai
patent: 4266211 (1981-05-01), Ulanet
patent: 4414520 (1983-11-01), Ruuth
patent: 4493407 (1985-01-01), Newton
Braun Leslie A.
Lorence Richard M.
Sanden Corporation
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