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:
Apr. 24, 2001
Filed:
Oct. 29, 1999
Hirofumi Katoh, Kanagawa, JP;
Tatsuyuki Matsuya, Kanagawa, JP;
Unisia Jecs Corporation, Atsugi, JP;
Abstract
A temperature-sensing, variable-speed fan drive with a fluid coupling filled with working fluid, for cooling two stacked heat exchangers, namely an engine cooling-system radiator and an air-conditioner condenser located in front of the radiator, comprises a partition plate dividing the internal space of a fan housing into a reservoir chamber and a working chamber, and two different communication ports, each formed in the partition plate to communicate the reservoir chamber with the working chamber. In addition to a first valve mechanism which adjusts the opening of one of the two communication ports in response to atmospheric temperature in the circumference of the housing, a second valve mechanism is provided to adjust the opening of the other of the two communication ports in response to a refrigerant pressure in the air-conditioner condenser. The second valve mechanism includes a valve portion which opens and closes the other communication port, a push rod associated with the valve portion, and an actuator which shifts the push rod from inactive to active in response to a control signal. Also provided is a fan-drive controller which outputs the control signal to the actuator when the refrigerant pressure in the air-conditioner condenser exceeds the predetermined threshold value.