Pump and center section for hydrostatic transmission

Details Pump and center section for hydrostatic transmission Pump and center section for hydrostatic transmission

2005-04-19

2005-04-19

Look, Edward K. (Department: 3745)

Motors: expansible chamber type

Three or more cylinders arranged in parallel radial or...

Control valve seating surface contact maintained by fluid...

C091S499000, C060S487000

Reexamination Certificate

active

06880448

ABSTRACT:
A hydraulic transmission having a hydraulic pump, a hydraulic motor and a center section having a pump running surface on which the hydraulic pump rotates and a motor running surface of which the hydraulic motor rotates. The center section has porting by which the hydraulic pump and the hydraulic motor are in fluid communication wherein the porting terminates in a pair of equidistantly spaced, generally arcuate shaped openings. The pump running surface includes a plurality of generally v-shaped grooves extending from each of the ends of the generally arcuate shaped openings.

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