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:
Nov. 12, 2002
Filed:
Dec. 19, 2000
Applicant:
Inventor:
James A. Krisher, Fort Wayne, IN (US);
Assignee:
Spicer Technology Inc., Fort Wayne, IN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16H 4/830 ;
U.S. Cl.
CPC ...
F16H 4/830 ;
Abstract
A differential gear assembly has a friction clutch for variably restricting differential action. A simple hydraulic piston mechanism is used to amplify the axial force generated by the electric coil and mechanical ball ramp mechanism. The hydraulic system consists of an annular primary piston in contact with the clutch pack, and a multiple set of secondary pistons are attached to the unrestrained ball ramp race. Hydraulic fluid fills the cavity between the primary and secondary pistons. This system provides force multiplication proportional to the surface areas of the respective piston faces.