Patent ID: 9074670
Filing Date: 2015-07-07
Classification: B62D,E02F,F04B,F04C,F15B,F16H

Abstract:
1. A hydraulic pump assembly comprising: a main pump housing; a first hydraulic porting member having a first face and a second face on opposite sides of the first hydraulic porting member, wherein the first face is engaged to the main pump housing to form a sump therewith; a second hydraulic porting member having a third face and a fourth face on opposite sides of the second hydraulic porting member, wherein the third face comprises a pocket formed therein and is directly engaged to the second face, and wherein the second hydraulic porting member is engaged to the main pump housing, sandwiching the first hydraulic porting member between the main pump housing and the second hydraulic porting member; an auxiliary pump housing engaged to the fourth face to form an auxiliary pump chamber; a main pump located in the sump and rotatably disposed on the first face; a charge pump comprising a gerotor pump located entirely within the pocket and rotatably disposed on the second face; an auxiliary pump located in the auxiliary pump chamber and rotatably disposed on the fourth face; and a pump shaft rotatably engaged to the auxiliary pump, the charge pump, and the main pump, wherein the pump shaft extends from the main pump housing.