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. 09, 1989
Filed:
May. 18, 1987
Robert J Mohan, Madison Heights, MI (US);
Walter K O'Neil, Birmingham, MI (US);
Eaton Corporation, Cleveland, OH (US);
Abstract
A viscous fan clutch (10) is typically employed in a fan drive mechanism within in a truck or or automobile. A shaft (18), driven by the engine (12), rotates a clutch member (42) within the fan drive. The clutch member is arranged for fluid engagement with a body member (60) for the transmission of torque thereto when fluid is disposed in an operating chamber (100) defined by complementary shear surfaces in the clutch and body members (48 and 98), respectively. A tether assembly (30) operates as an actuator to displace a valving member (158) within the clutch to control the torque transmission therethrough and thus the speed of the output shaft (and fan 34) thereof. Fan speed is regulated as a function of a sensed temperature of the host engine by a control circuit (176) which senses fan speed and coolant fluid temperature and generates a speed error signal as a function of temperature.