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:
Jun. 19, 2001
Filed:
Dec. 20, 1999
Naohiro Hara, Chita-gun, JP;
Yasuo Ozawa, Kariya, JP;
Aisin Seiki Kabushiki Kaisha, Aichi-Pref, JP;
Abstract
The present invention provides a cooling water circulating apparatus capable of securing a required flow rate of cooling water without increasing the heads of water pumps. The apparatus includes a first water pump which has a first supply port for supplying the cooling water into the first water pump, the cooling water for flowing through the interior of an engine, and a first discharge port for discharging the supplied cooling water from the first water pump to the engine again, and which is directly connected to and rotated with a cam shaft of the engine. A control mechanism is adapted to cut off a flow of the cooling water, which is directed from a radiator to the first supply port, when the temperature of the cooling water is not higher than a predetermined level, and operatively connect the radiator and first supply port with each other when the temperature of the cooling water is higher than the predetermined level. A second water pump includes a second supply port for supplying the cooling water from the second water pump to flow through the interior of the engine, and a second discharge port for discharging the supplied cooling water from the second water pump to the supply port of the first water pump. The second water pump is not rotated when the temperature of the cooling water is not higher than a predetermined level, and is electrically rotated when the temperature of the cooling water is higher than the predetermined level.