192 clutches and power-stop control – Clutches – Fluent material
Patent
1976-01-12
1977-07-19
Herrmann, Allan D.
192 clutches and power-stop control
Clutches
Fluent material
192 82T, 236 88, F16D 3500, F16D 4325
Patent
active
040363392
ABSTRACT:
A noise is generated unavoidably owing to hunting phenomenon that appears in process of increasing or decreasing torque to be transmitted by a hydraulic coupling in a hitherto known type, when it is subjected to change of the ambient temperature.
A purpose of this invention is to provide a new and unique hydraulic coupling which enables hydraulic connection to be effected very quickly in such a way that engagement or disengagement between ferrite and magnet is applied to transfer mechanism in hydraulic coupling, depending on the ambient temperature.
The above purpose of the invetion has been accomplished as follows.
Magnetical attractive force between ferrite and magnet is predetermined to overcome spring force in a normal temperature, and working temperature for this new mechanism according to the invention is selected around at Curie temperature of said ferrite material. So the magnetically attractive force will decrease abruptly, when the hydraulic coupling is exposed to a temperature higher than said Curie point. On the other hand, when the ferrite is exposed to a temperature lower than said working temperature, the magnetically attractive force therebetween becomes larger than the spring force, so that fluid transfer into storage chamber is completed in a moment. On the contrary, when the ferrite is exposed to a temperature higher than the selected temperature, the attractive force becomes lower than the spring force, so that fluid transfer into torque transmission chamber is effected instantaneously.
REFERENCES:
patent: 2339087 (1944-01-01), Mantz
patent: 2390985 (1945-12-01), Boyer
patent: 3144922 (1964-08-01), Weir
patent: 3197003 (1965-07-01), Yetter
patent: 3339688 (1967-09-01), Harvey
Calvaruso Joseph
Casella Anthony J.
Herrmann Allan D.
Usui Kokusai Sangyo Kabushiki Kaisha
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