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:
Jan. 03, 1989
Filed:
Dec. 18, 1987
Walter J Iseman, Monroe Center, IL (US);
Sundstrand Corporation, Rockford, IL (US);
Abstract
A hydraulic differential having a pair of axial piston displacement units, with one being a fixed displacement unit, and the other being a variable displacement unit, and having flow-directing valve and port plates positioned therebetween. The hydraulic sealing of the components which rotate relative to each other is achieved by a floating mounting of a port plate which is urged by a block spring of the fixed displacement unit against an adjustable valve plate abutting a cylinder block of the variable displacement unit. The drive input for the hydraulic differential includes a rotatable mounting for the fixed angle wobbler of the fixed displacement unit which is drivingly connected through a connecting tubular member to the cylinder block of the variable displacement unit and with the cylinder block of the fixed displacement unit connected to a drive output shaft. Relatively small radial bearings rotatably mount the components within a case and are only required to react the spring load of the block spring acting against the floating port plate.