Finger lever for actuating a gas exchange valve

Details Finger lever for actuating a gas exchange valve Finger lever for actuating a gas exchange valve

1997-08-14

1998-07-14

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9041, 123198F, 74519, 74559, F01L 1300, F01L 118

Patent

active

057788391

ABSTRACT:
A valve actuating mechanism which can be set to three different strokes for a gas exchange valve includes a finger lever actuated by a control cam with a single lift curve, with the finger lever being selectively connectable to a longitudinal guide in the region of its bearing member via incorporation of a piston that is movable in various positions. In a first coupling position of the piston, the bearing member is fixed to the longitudinal guide so that the finger lever executes a maximum pivot during the lift phase of the cam. In a second coupling position of the piston the finger lever is moved axially along the longitudinal guide during a complete cam lift so that the opening cross section of the gas exchange valve is smaller than in the first coupling step. In a third coupling step of the piston, the finger lever executes an idle stroke-pivoting movement on its point of contact on the gas exchange valve which remains closed.

REFERENCES:
patent: 4726332 (1988-02-01), Nishimura et al.
patent: 5357916 (1994-10-01), Matterazzo
JP,A,60 150413 (Mitsubishi Jidosha Kogyo KK), Aug. 8, 1985.

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