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:
Sep. 19, 2006
Filed:
Sep. 16, 2004
Norio Takayasu, Kyoto, JP;
Toshihiko Oka, Anjyo, JP;
Tetsushi Nagira, Toyota, JP;
Satoshi Ando, Aichi, JP;
Shinichi Murata, Okazaki, JP;
Masanori Tokuhisa, Rittou, JP;
Norio Takayasu, Kyoto, JP;
Toshihiko Oka, Anjyo, JP;
Tetsushi Nagira, Toyota, JP;
Satoshi Ando, Aichi, JP;
Shinichi Murata, Okazaki, JP;
Masanori Tokuhisa, Rittou, JP;
Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Tokyo, JP;
Mitsubishi Jidosha Engineering Kabushiki Kaisha, Aichi, JP;
Abstract
A valve gear for an internal combustion engine capable of promptly switching the position of a piston in a rocker arm to thereby change the engine operating condition with a satisfactory response, even in a low rotation region in which an adequate amount of oil discharged from an oil pump cannot be expected. Depending on positions of pistons slidably fitted in low-speed and high-speed cylinder portions provided in an intake driven rocker arm, a low-speed or high-speed drive rocker arm is selectively operated to press a corresponding one of the pistons. The piston in the low-speed cylinder portion switched in a low rotation region is made smaller in diameter than the piston in the high-speed cylinder portion, to be enabled to be promptly switched.