The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 2018
Filed:
Jan. 28, 2015
Parker-hannifin Corporation, Cleveland, OH (US);
David Mark Heathcoat, Jr., Greeneville, TN (US);
Jason Lee Emmette, Greeneville, TN (US);
Roger Paul Gray, Greeneville, TN (US);
Somer Renee Malone, Chuckey, TN (US);
Kirk Ayres Lola, Rutherfordton, NC (US);
Kerry Todd Brock, Forest City, NC (US);
Eli Cutshall, Mosheim, TN (US);
Parker-Hannifin Corporation, Cleveland, OH (US);
Abstract
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