Patent ID: 7788920
Filing Date: 2010-09-07
Classification: F15B

Abstract:
1. Apparatus comprising a pump for providing a supply of pressurized hydraulic fluid, and structure forming a hydraulic fluid flow path between the pump and a bidirectional hydraulic motor, wherein the structure forming a hydraulic flow path between the pump and the bidirectional hydraulic motor comprises hydraulic motor direction control valves selectively settable, by use of a manually actuated shifter, in configurations for forward drive, reverse drive, and neutral lock-up, of the bidirectional hydraulic motor, and a pump flow rate controller including a first speed valve selectively settable in configurations for flow output or flow recirculation, wherein in flow output configuration, a first speed flow of hydraulic fluid is supplied through the hydraulic fluid flow path from the hydraulic pump to the bidirectional hydraulic motor, and wherein in recirculation configuration, hydraulic fluid bypasses the bidirectional hydraulic motor and is returned to the hydraulic pump; said apparatus further comprising an actuator for the hydraulic motor direction control valves for simultaneously selectively setting the valves in cooperating configurations for forward drive, reverse drive, or lock-up; an actuator for the first speed valve for simultaneously setting the first speed valve in recirculation configuration when the hydraulic motor direction control valves are set in neutral lockup configuration, and means establishing a signal path from the shifter to the actuator for the first speed valve, wherein a signal from the neutral position on the shifter further signal the actuator for the first speed valve to set the first speed valve in configuration for recirculation.