Parker-hannifin Corporation

Somer Renee Malone

Jason Scot Richardson

Michael Tholan Crosby

Jason Lee Emmette

Raymond E Collett

Roger Paul Gray

Matthew Herman Simon

Thomas Kevin Castle

David Mark Heathcoat

David Mark Heathcoat, Jr

Richard C Hynes

Brian Timothy Painter

Kirk Ayres Lola

Brook Cutshaw

Kerry Brock

John Matthew Rector

Eli Cutshall

Kerry Todd Brock

Jr David Mark Heathcoat

An example hydraulic pump comprises: a housing; an input shaft extending from the housing; a seal disposed within the housing and positioned about the input shaft; and a seal guard member positioned about the input shaft and mounted to the housing at an interface between the input shaft and the housing, wherein the seal guard member is configured to allow rotation of the input shaft without rotating therewith.

Debris exclusion seal guard for a pump

A center section/motor sub-assembly for use in a hydrostatic transmission includes a center section having a pump running face for interfacing with a pump, and a motor running face for interfacing with a motor. The center section and the motor are configured for the hydraulic separating forces of the motor to be reacted only into the center section. The center section has two internal passages between pump kidney ports and motor kidney port, and the motor kidney ports are raised in elevation relative to the pump kidney ports. The internal passages run parallel to each other as they rise in elevation. A hydrostatic transmission includes the sub-assembly enclosed by a housing, in combination with a pump and output shaft assembly. For installation, the output shaft assembly is configured as a separate component from the sub-assembly of the center section and the motor.

Modular hydrostatic transmission

A zero turn mower vehicleincludes left and right hydrostatic transmissionsdriving wheels. The transmissionseach include a swashplate type axial piston hydraulic pumphaving a swashplate. A systemand method controls each pump. A controllerreceives input signals and provides output signals to electric motorsto control each swashplate. Operator interface input devicesprovide inputs to controller. Angle sensorsprovide additional inputs to controller. Displacement amplifiersamplify displacement of each swashplate, and torque amplifiersamplify torque of electric motors

Pump control system and method

A hydraulic apparatus is provided with a return to neutral mechanism for returning a trunnion control bracket arm to a neutral position. The return to neutral mechanism comprises a pair of springs, one spring connecting a fixed bracket to a first rotatable bracket and the other spring connecting the fixed bracket to a second rotatable bracket. The mechanism uses springs with different spring constants and the springs are attached to the brackets in a single plane.

Hydraulic apparatus return to neutral mechanism

Growing community of inventors

Chuckey, TN, United States of America

Somer Renee Malone