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:
Feb. 05, 2002
Filed:
Apr. 03, 2000
Steven R. Pedersen, Baltimore, MD (US);
Other;
Abstract
A rotary power transmission device is disclosed in which output/input speed ratio is automatically and continuously adjusted as a function of both demand torque and demand speed by translation of a traction wheel upon the faces of two coaxial counter-rotating drive plates which are in concurrent tangential enforced contact with the wheel, with wheel serving as output. Translation of wheel is accomplished by applying opposed forces of a hydraulically actuated piston and a compression spring. Magnitude of hydraulic pressure upon piston is defined by combined action of pump speed and restriction of a flow control valve. By causing pump speed to be proportional to input speed, and valve restriction to be a function of an environmental variable such as inclination of a vehicle equipped with the transmission, traction wheel position and thus speed ratio is automatically adjusted as a function of both demand torque and demand speed. Traction wheel translation under high radial force is facilitated by use of rollers circumferentially distributed upon the periphery of traction wheel, which react radial forces while rolling upon drive plates in response to translation of traction wheel.