Parker-hannifin Corporation

Jason Lee Emmette

Jason Scot Richardson

Michael Tholan Crosby

David Mark Heathcoat, Jr

Somer Renee Malone

Roger Paul Gray

David Mark Heathcoat

Richard C Hynes

Brook Cutshaw

Kirk Ayres Lola

Kerry Brock

Eli Cutshall

Mike Crosby

Kerry Todd Brock

Jr David Mark Heathcoat

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

Provided is a hydrostatic transmission including a pump/motor module having a reservoir housing and a hydraulic pump and motor disposed in the reservoir housing, and a speed reduction module having a speed reduction housing coupled to the reservoir housing and a speed reduction assembly disposed in the speed reduction housing. The speed reduction assembly includes an input member driven by the output shaft of the hydraulic motor, an output member rotationally connected to the input member by one or more belts/chains, and an axle shaft driven by rotation of the output member. By providing the speed reduction assembly in a separate housing from the hydraulic fluid in the reservoir housing, the speed reduction assembly is isolated from the hydraulic fluid thereby preventing particulates from the speed reduction assembly from entering the hydraulic fluid in the reservoir housing.

Residential transmission

Provided is a hydrostatic transmission including a hub having a plurality of radially outwardly protruding teeth circumferentially spaced around the hub and at least one jaw having at least one tooth for engaging teeth on the hub to prevent rotation of the hub, thereby preventing rotation of an output shaft of a motor. When the at least one tooth on the jaw engages teeth on the hub, rotation of the output shaft is prevented by interference rather than friction.

Jaw-type positive locking brake

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

Greeneville, TN, United States of America

Jason Lee Emmette