Internal-combustion engines – Poppet valve operating mechanism – Lubrication
Reexamination Certificate
2005-04-05
2005-04-05
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Lubrication
C123S090340, C123S090390, C123S090440
Reexamination Certificate
active
06874456
ABSTRACT:
In a valve operating apparatus, torque is transmitted from an eccentric drive cam attached to a drive shaft through a multinodular-link motion-transmission mechanism including a link arm, a rocker arm, and a link rod to a rockable cam to cause an engine valve to open and close. Also provided is a control cam whose geometric center is displaced from a control shaft. By way of eccentric rotary motion of the control cam, a valve lift of the engine valve is variably controlled. Lubricating oil supplied from an oil passage formed in the drive shaft via a first communicating passage formed in the drive cam into a clearance between the link arm and the drive cam, is forcibly fed via a second communicating passage into a pivotally linked portion between the link arm and the rocker arm by oscillatory pumping action created by eccentric rotary motion of the drive cam.
REFERENCES:
patent: 4662323 (1987-05-01), Moriya
patent: 6125806 (2000-10-01), Nishi et al.
patent: 6382150 (2002-05-01), Fischer
patent: 6470841 (2002-10-01), Takahashi et al.
patent: 2001-55915 (2001-02-01), None
Uchida Katsuhiko
Yamada Yoshihiko
Chang Ching
Foley & Lardner LLP
Hitachi , Ltd.
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