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:
Mar. 17, 1992
Filed:
Nov. 27, 1990
Kunimasa Yoshimura, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Abstract
A secondary air supply system for an internal combustion engine includes a first hydraulic passage including a first hydraulic motor for an engine cooling fan. The system further includes a second hydraulic passage including a second hydraulic motor for a secondary air supply pump. At a connecting point of the first hydraulic passage and the second hydraulic passage, a hydraulic passage switching valve is installed. The hydraulic passage switching valve causes oil to flow through the second hydraulic passage to drive the air pump for a few minutes after engine start and then switches to cause the oil to flow through the first hydraulic passage to drive the engine cooling fan. In this way, the secondary air supply pump is driven not by a pulley-belt assembly but by a hydraulic system, and a single hydraulic pump can be used for driving both the engine cooling fan and the secondary air supply pump.