Patent ID: 8528325
Filing Date: 2013-09-10
Classification: A01D,B60K,F04B,F16D

Abstract:
1. A hydraulic drive unit, comprising: a hydraulic mounting member having a first side and second side opposite the first side, and comprising a first pump running surface and a second pump running surface formed on the first side, and a first pair of hydraulic ports connected to the first pump running surface and a second pair of hydraulic ports connected to the second pump running surface; a pump casing attached to the first side of the hydraulic mounting member to form a pump chamber; a gear casing attached to the second side of the hydraulic mounting member to form a gear chamber; a first hydraulic pump disposed in the pump chamber and comprising a first rotatable cylinder block disposed on the first pump running surface and a first pump shaft engaged to and driving the first rotatable cylinder block, wherein the first pump shaft has a first longitudinal axis of rotation; a second hydraulic pump disposed in the pump chamber and comprising a second rotatable cylinder block disposed on the second pump running surface and a second pump shaft engaged to and driving the second rotatable cylinder block, wherein the second pump shaft has a second longitudinal axis of rotation; and a main drive shaft extending into the gear chamber and having a third axis of rotation that is offset from the first and second axes of rotation, the main drive shaft engaged to and driving the first pump shaft and second pump shaft through a gear set disposed in the gear chamber.