Lubrication – Systems – Gearing
Patent
1997-03-21
1998-05-12
Denion, Thomas E.
Lubrication
Systems
Gearing
184 622, 1841041, 74467, F01M 900
Patent
active
057494398
ABSTRACT:
A powertrain includes a multi-speed transmission having a primary storage reservoir which has sufficient volume to contain the transmission fluid when the temperature thereof is at or below a predetermined temperature. At higher temperatures, a portion of the hydraulic fluid is directed to a cooling device which also provides secondary storage. A valve mechanism is provided to control the hydraulic fluid flow such that below the predetermined temperature, hydraulic fluid is not directed to the cooling device which is drained by the valve mechanism to the primary storage. The valve mechanism is temperature-responsive whereby at temperatures above the predetermined temperature a portion of the hydraulic fluid must fill and pass through the cooling device before being directed to a lubrication circuit and returned to the primary storage, thereby increasing the storage volume available to the system.
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Denion Thomas E.
General Motors Corporation
Scherer Donald F.
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