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. 29, 1992
Filed:
Apr. 17, 1991
Zenichirou Katou, Mishima, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A piston cooling device for internal combustion engines is disclosed. Lubricating oil discharged from an oil pump is led through an inlet provided on an external peripheral surface of a main journal into a first oil passage and is further delivered to an outlet provided on the opposite side of the crankshaft as the inlet. A crank pin is rotatably received by an end portion of a connecting rod, having a bearing surface interposed therebetween. A clearance is provided between the bearing surface and the crank pin. A second oil passage is provided at the connecting rod, communicating with the clearance. A port formed on the bearing surface makes the first oil passage communicate with the clearance and with the second oil passage when a crank angle comes to a range of between 0 and 90 degrees before a piston dead center position or when the inertia load applied to between the end portion of the connecting rod and the crank pin becomes is minimized. This arrangement delivers lubricating oil to the clearance to form an oil film that provides good lubrication. Additionally oil is sprayed from the second oil passage to cool the piston.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile