Valve gear device

Details Valve gear device Valve gear device

1994-09-21

1996-02-06

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123198F, F01L 1300, F02D 1306

Patent

active

054889340

ABSTRACT:
A valve gear device includes a stem having one end and the other end, an intake and exhaust valve connected to the other end of the stem and serving for opening and closing a port formed in a cylinder block of an internal combustion engine, a first spring biasing the stem toward a closing condition of the intake and exhaust valve, a cam, and a valve control device interposed between the cam and one end of the stem, the valve control device having a first member fitted in the cylinder block so as to be slidable along an axis of the stem and engaged with the cam, a second member receiving one end of the stem and movable within the first member relative thereto and a regulating device for permitting and preventing the movement of the second member relative to the first member. Such a structure enables that the top end of the stem is out of sliding engagement with any of related members, thereby preventing a friction wear of the top end of the stem.

REFERENCES:
patent: 4770137 (1988-09-01), Okabe et al.
patent: 5090364 (1992-02-01), McCarroll et al.
patent: 5287830 (1994-02-01), Dopson et al.
patent: 5343833 (1994-09-01), Shirai
patent: 5361733 (1994-11-01), Spath et al.
patent: 5361734 (1994-11-01), Shirai

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