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. 25, 1989
Filed:
Apr. 15, 1988
Applicant:
Inventor:
Seiji Omura, Toyota, JP;
Assignee:
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01P / ;
U.S. Cl.
CPC ...
123 4112 ;
Abstract
A device for controlling the rotation speed of a cooling fan of an internal combustion engine in a vehicle such as an automobile, wherein the fan is driven by a hydraulic motor powered by an operating fluid supplied by a pump directly driven by the engine, wherein the device controls partial relief of the hydraulic fluid supplied from the pump toward the motor so that, in a low engine revolution speed range, the ratio of the partial relief is decreased as the engine temperature increases, but in a high engine revolution speed range, the ratio of the partial relief is increased as the engine revolution speed increases.