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:
Dec. 01, 1987
Filed:
Mar. 06, 1986
Applicant:
Inventor:
Johann Merz, Schwabisch Gmund, DE;
Assignee:
Zahnradfabrik Friedrichshafen, Ag., Friedrichshafen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01P / ;
U.S. Cl.
CPC ...
123 4112 ; 123 4149 ; 13762547 ;
Abstract
A regulatable drive for speed control of the cooling fan of an internal combustion engine comprises fluid feed from a tank to the suction side of a pump via a suction passage wherein flow is controlled by a regulatable multi-position valve. The pump provides pressure feed to the suction side of a fluid motor that operates the fan. A bypass passage connects the suction passage of the fluid pump through the regulatable valve to the suction side of the fluid motor. The regulatable valve is actuated for control of suction feed to the pump responsive to fan speed via control circuitry which may also be responsive to engine temperature.