Patent ID: 7065964
Filing Date: 2006-06-27
Classification: B60K,B60Y,F04B,F16H,Y10T

Abstract:
1. A center section for a hydraulic drive apparatus, comprising: a first running surface comprising a first pair of arcuate ports formed thereon; a second running surface perpendicular to the first running surface and comprising a second pair of arcuate ports formed thereon; a first system port formed in the center section and connecting one of the first pair of arcuate ports to one of the second pair of arcuate ports; a second system port formed in the center section and connecting the other of the first pair of arcuate ports to the other of the second pair of arcuate ports; and a first check valve located in the center section and connected to the first system port and a second check valve located in the center section and connected to the second system port, each check valve comprising a valve body located in a check valve opening formed on an external surface of the center section; wherein at least a portion of at least one system port and the entire body of at least one of the check valve bodies is located directly below the first running surface, whereby a line perpendicular to and through the first running surface intersects both the one check valve body and the portion of the system port.