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:
Dec. 13, 2011
Filed:
Jun. 02, 2008
Brian D. Kuras, Metamora, IL (US);
Michael G. Cronin, Peoria, IL (US);
Frank A. Demarco, East Peoria, IL (US);
Mustafa Guven, Dunlap, IL (US);
Michael J. Barngrover, Peoria, IL (US);
Brian D. Kuras, Metamora, IL (US);
Michael G. Cronin, Peoria, IL (US);
Frank A. DeMarco, East Peoria, IL (US);
Mustafa Guven, Dunlap, IL (US);
Michael J. Barngrover, Peoria, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A hydraulic motor system for improved frequency response includes a hydraulic variator having a pump and a motor, wherein the pump includes a variable angle swash plate, and the system further includes an electric actuator for controlling an angle or torque of the swash plate, thereby controlling the motor output characteristics. The electric actuator for controlling the variable angle swash plate may comprise a linear electric motor, ball screw drive or a rotary electric motor. In an example, the rotary electric motor tilts the swash plate by applying a torque to the swash plate at a point away from its tilt axis. In a further example, the rotary electric motor tilts the swash plate via a worm drive or ball screw drive.