Pump cover inlet porting and seal for hybrid transmission

A multi-mode hybrid-type power transmission having a transmission housing including an input cover positively attached to a main housing portion, an oil pan for stowing hydraulic fluid in fluid communication with and attached to the main housing portion, and a transmission input shaft in driving communication with an engine crankshaft, the hybrid transmission comprising:

• a pump housing attached to the input cover to define a substantially cylindrical pump pocket therebetween, wherein said pump pocket circumscribes and is coaxially aligned with the transmission input shaft;
• a hydraulic pump assembly operatively housed at least partially inside said pump pocket;
• and
• a torque transmitting assembly attached to said pump housing, said torque transmitting assembly having a piston housing member coaxial with and longitudinally spaced from said pump housing to define a fluid inlet passage therebetween that is configured to fluidly communicate the oil pan with said pump pocket;
• a gasket member disposed between said pump housing and said piston housing member, wherein said gasket member defines a plurality of separate pressure seal sections for transferring hydraulic fluid through said pump housing;
• and
• wherein said inlet passage is at least partially radially aligned with and oriented radially adjacent to said pump pocket.

A multi-mode hybrid-type power transmission having a transmission housing including an input cover positively attached to a main housing portion, an oil pan for stowing hydraulic fluid in fluid communication with and attached to the main housing portion, and a transmission input shaft in driving communication with an engine crankshaft, the hybrid transmission comprising:

• a pump housing attached to the input cover to define a substantially cylindrical pump pocket therebetween, wherein said pump pocket circumscribes and is coaxially aligned with the transmission input shaft;
• a hydraulic pump assembly operatively housed at least partially inside said pump pocket;
• and
• a torque transmitting assembly attached to said pump housing, said torque transmitting assembly having a piston housing member coaxial with and longitudinally spaced from said pump housing to define a fluid inlet passage therebetween that is configured to fluidly communicate the oil pan with said pump pocket;
• wherein said inlet passage is at least partially radially aligned with and oriented radially adjacent to said pump pocket;
• wherein said pump assembly includes a pump rotor drivingly engaged to the transmission input shaft such that rotation of the transmission input shaft turns said pump rotor creating a pressure gradient inside of said pump pocket thereby drawing fluid from the oil pan to said inlet passage;
• and
• wherein the transmission input shaft includes a first plurality of flats circumferentially spaced along an outer peripheral surface thereof, and said pump rotor includes a second plurality of flats circumferentially spaced along an inner peripheral surface thereof, wherein said first and second pluralities of flats are configured to mate with each other and thereby drivingly connect said pump rotor to the input shaft.