Sealed low leak controls system in an automatic transmission
AssigneeGM Global Technology Operations LLC
InventorsDaryl A. Wilton, James M. Hart, Eric C. Sandstrom
Life of this patent
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Abstract
A transmission sealed low leak controls system includes a controls system having a first fluid for operation of the controls system provided by a first pump at a first pressure. A transmission input shaft is provided. A planetary gear set is connected to the transmission input shaft by a clutch assembly. A second pump provides a second fluid different from the first fluid for cooling and lubrication of the at least one clutch assembly at a second pressure lower than the first pressure. A torque converter is connected to the transmission input shaft. The second pump further provides the second fluid to the torque converter.
Claims18
A transmission sealed low leak controls system, comprising:
- a controls system having a fluid for operation of the controls system provided by a first pump;
- a transmission input shaft;
- at least one planetary gear set;
- at least one clutch assembly connecting the at least one planetary gear set to the transmission input shaft;
- and
- a second pump providing a fluid for cooling and lubrication of the at least one clutch assembly,
- wherein the fluid for operation of the controls system is different from the fluid for cooling and lubrication of the at least one clutch assembly.
A transmission sealed low leak controls system, comprising:
- a controls system having a fluid for operation of the controls system provided by a first pump at a first pressure;
- a transmission input shaft;
- at least one planetary gear set;
- at least one clutch assembly connecting the at least one planetary gear set to the transmission input shaft, the at least one clutch assembly including:
- a slidably displaceable piston;
- and
- a hub co-rotating with the at least one clutch assembly and contacted by the piston in a clutch engaged condition;
- and
- a second pump providing a fluid for cooling and lubrication of the at least one clutch assembly at a second pressure lower than the first pressure,
- wherein the fluid for operation of the controls system is different from the fluid for cooling and lubrication of the at least one clutch assembly.
A transmission sealed low leak controls system, comprising:
- a controls system having a first fluid for operation of the controls system provided by a first pump at a first pressure;
- a transmission input shaft;
- at least one planetary gear set;
- at least one clutch assembly connecting the at least one planetary gear set to the transmission input shaft;
- a second pump providing a second fluid different from the first fluid for cooling and lubrication of the at least one clutch assembly at a second pressure lower than the first pressure;
- and
- a torque converter connected to the transmission input shaft, wherein the second pump further provides the second fluid to the torque converter.
Dependencies are inferred from the claim text.