Patent ID: 7340892
Filing Date: 2008-03-11
Classification: F04B,F04F,F16D

Abstract:
1. A hydraulic drive device, comprising: a hydraulic member located in a fluid sump and having at least a first running surface for a rotatable cylinder block formed thereon; hydraulic porting formed in the hydraulic member and comprising a first port and a second port extending into the hydraulic member from the first running surface, and a valve port extending into the hydraulic member from an exterior surface thereof and intersecting both the first and second ports; and a venturi charge pump disposed in the valve port and in fluid communication with both the first and second ports and the fluid sump, the venturi charge pump comprising a valve body located substantially entirely within the hydraulic member, a first opening of the valve body located proximate to the first port, and a second opening of the valve body located proximate to the second port.