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. 16, 2008
Filed:
Dec. 07, 2004
Shuichi Ezaki, Susono, JP;
Toshiaki Asada, Mishima, JP;
Manabu Tateno, Nagaizumi-cho, JP;
Toyota, Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
Disclosed is a variable valve mechanismfor changing the lift amount and operating angle of an internal combustion engine valve disc. The variable valve mechanism comprises a first cam, which rotates in accordance with crankshaft rotation; a transmission memberthat includes a second cam, which oscillates in synchronism with the rotation of the first camand transmits the force exerted by the first camto the valve disc; a control shaft, which is adjusted for a predetermined rotation position; an adjustment mechanismfor varying the lift amount and operating angle of the valve discby changing the oscillation range of the transmission memberin accordance with the rotation position of the control shaft; a lost motion springfor pressing the transmission membertoward the first camto ensure that the transmission memberremains coupled to the first cam; and an assist springfor pressing the transmission memberin resistance to the force exerted by the lost motion spring