CAM AND DEVICE FOR CHANGING VALVE CHARACTERISTIC FOR INTERNAL COMBUSTION ENGINE

Japanese Patent JP3692849

B2

PROBLEM TO BE SOLVED: To prevent the enlargement of a device and an engine and the interference of the abutment of a cam follower on a cam surface, and to realize a sufficient gas passing amount.
SOLUTION: In a lift pattern by an intake cam, two maximal parts Mx1, Mx2 exist in the changing rate of a lift amount to a turning angle on a valve opening side (the advancing side of a peak P), and a minimal part may not exist in the lift amount. Thereby, a rise part having no trough part is formed during an exhaust stroke. Accordingly, exhaust can be recirculated, and the abutment of a cam follower may not be interfered. Besides, even though the lift amount is small, an exhaust passing amount can be sufficiently secured by the whole rise part. Thus, the intake cam which is a three-dimensional cam is not required to have such a profile that a cam profile is changed at a sharp angle or axially lengthened. Therefore, the enlargement of a device and an internal combustion engine can be prevented.

WO/1993/003261	A CAM DEVICE WITH A SHAPE BEING DEFORMABLE AND/OR REMOVABLE BY MEANS OF A FLUID UNDER PRESSURE FOR VARYING THE PHASING OF ENGINE VALVES
JP4063478	Variable valve gear for internal combustion engine
WO/2013/053669	CAMSHAFT AND FUNCTIONAL ELEMENTS FOR A CAMSHAFT

Yoshito Moriya
Yoshihiko Masuda
Hideo Naganaga
Shuji Nakano
Kikuoka Shinichiro

JP23601199A

September 07, 2005

August 23, 1999

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TOYOTA JIDOSHA KABUSHIKI KAISHA

F01L1/08; F01L13/00; F02D13/02; (IPC1-7): F01L1/08; F01L13/00; F02D13/02

JP10266819A
JP726921A
JP5581253A

Hironobu Onda

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