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. 18, 1995
Filed:
May. 14, 1993
Applicant:
Inventor:
Bradley C Litz, Montville, NJ (US);
Assignee:
Curtiss Wright Flight Systems Inc., Fairfield, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16D / ;
U.S. Cl.
CPC ...
60483 ; 60484 ;
Abstract
The use of two variable displacement over-center hydraulic motors 12,14 in conjunction with a torque-summing gearbox 16 for maintaining the torque output of a power drive unit 10 in a typical closed loop control system is described. The torque output of the power drive unit 10 is maintained as either the sum or the difference of the torque outputs produced by the two variable displacement over-center hydraulic motors 12,14, depending upon the required system performance. This present invention use overcomes the problems associated with a single variable displacement over-center hydraulic motor operating in the stick-slip zone.