Electronically controlled dampener for hydrostatic transmission

摘要

A hydrostatic transmission (22) including a fluid motor (84) and a variable displacement fluid pump (86) in fluid communication with the motor and having a first and a second, greater, fluid displacement rate. The pump is mounted on a block (78) having an outer surface (211), at least one passage (208, 210) through which fluid flows from the pump to the motor, and at least one first and second fluid bleed hole (213,215 and 214,216) extending from the passage to the outer surface. The passage and a sump external to the pump are in fluid communication through the bleed holes and the void (234) of a sliding element (230) disposed within a bore(218) in the block when the pump is operating at its first rate and the sliding element is in a first position. The first bleed hole and the sump are substantially out of fluid communication when the pump is operating at its second rate and the sliding element is in a second position. <IMAGE>