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:
Aug. 19, 2008
Filed:
Dec. 12, 2006
Naoki Takahashi, Yokohama, JP;
Yoshiaki Tanaka, Fujisawa, JP;
Hideaki Mizuno, Yokohama, JP;
Kenshi Ushijima, Kamakura, JP;
Yoshimi Nunome, Yokosuka, JP;
Naoki Takahashi, Yokohama, JP;
Yoshiaki Tanaka, Fujisawa, JP;
Hideaki Mizuno, Yokohama, JP;
Kenshi Ushijima, Kamakura, JP;
Yoshimi Nunome, Yokosuka, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A piston-crank mechanism links crankpins of a crankshaft with piston pins of pistons by using a plurality of links. The piston-crank mechanism allows an upward inertia force produced near a top dead center of each piston to be smaller than a downward inertia force produced near a bottom dead center of the piston in order to reduce secondary vibration occurring during operation. In a four-cycle inline four-cylinder internal combustion engine, a total force of inertia forces exerted from adjacent cylinders to each of second and fourth crankshaft bearings becomes a downward force, which reinforces a downward force produced in response to combustion pressure. These second and fourth crankshaft bearings have a rigidity higher than the remaining crankshaft bearings.