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:
May. 06, 2008
Filed:
Aug. 30, 2006
Takeshi Yamamoto, Toyota, JP;
Takayuki Aoyama, Nagoya, JP;
Mizuho Inagaki, Toyoake, JP;
Nobuyuki Mori, Nagoya, JP;
Hirotoshi Yoshizaki, Toyota, JP;
Takeshi Yamamoto, Toyota, JP;
Takayuki Aoyama, Nagoya, JP;
Mizuho Inagaki, Toyoake, JP;
Nobuyuki Mori, Nagoya, JP;
Hirotoshi Yoshizaki, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
In a crankshaft of an in-line four-cylinder engine, an arm that is closest to a flywheel has a greater average thickness in a direction of the rotation axis of the crankshaft than those of other arms. Two of the arms that are coupled to both sides of the third journal from the flywheel each have a center of gravity closer to its own counterweight compared to the centers of gravity of the arms that face the two arms with corresponding crankpins in between. Accordingly, the rigidity against torsional deformation and the thickness of oil films on the journals are reliably maintained while suppressing increase in the weight of the entire crankshaft.