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:
May. 31, 1988
Filed:
Jan. 08, 1987
Richard D Moan, Livonia, MI (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
In a belt driven continually variable transmission, the drive ratio is changed by varying the radial position of the drive belt by moving displaceable sheaves of a pulley assembly. A system for actuating the displaceable sheaves includes a ratio control valve supplied with pressurized fluid and connected to a source of ratio control pressure produced by a solenoid actuated valve. An orifice located between the ratio control valve and the hydraulic cylinder in which the displaceable sheave is located has feedback lines located on opposite sides of the orifice. Pressure in the feedback lines produces a differential force on the ratio control valve tending to increase the flow rate to the cylinder when the pressure drop across the orifice decreases.