초록 ▼

Cam mechanisms are provided for controlling valve means, and in particular relate to a cam mechanism for controlling the inlet and/or exhaust valve of an internal combustion engine. The cam mechanism comprises cam shaft means (10) having first (50) and second (51) cam means mounted thereon for rotat

Cam mechanisms are provided for controlling valve means, and in particular relate to a cam mechanism for controlling the inlet and/or exhaust valve of an internal combustion engine. The cam mechanism comprises cam shaft means (10) having first (50) and second (51) cam means mounted thereon for rotation therewith and first (52) and second (62) finger followers having first (59) and second (61) follower means respectively arranged to follow the surface of the first (50) and second (51) cam means, the first (52) and second (62) finger followers being rockable about fulcrum means (54 and 66) which holds the finger followers (52 or 62) in engagement with the cam means (50 or 51) and the valve means (14) thereby permitting control of the valve means (14) by the cam means. The first cam means (50), first follower means (59) and first finer follower (52) comprise a first short duration cam mechanism for low speeds of the engine, the fulcrum means (54 and 66) being in a first position at low speeds in which the first cam follower (59) is in engagement with the first cam means (50). At higher engine speeds the fulcrum means (66 and 55) operates in a second position wherein the second cam means (51), second follower means (61) and second finger follower (62) act as a long duration cam mechanism, the second cam follower (61) being in engagement with the second cam means (51).

대표청구항 ▼

An internal combustion engine having valve means and a cam mechanism for controlling the valve means comprising camshaft means having first and second cam means mounted thereon for rotation therewith and first and second finger followers rockable about fulcrum means, wherein the first finger followe

An internal combustion engine having valve means and a cam mechanism for controlling the valve means comprising camshaft means having first and second cam means mounted thereon for rotation therewith and first and second finger followers rockable about fulcrum means, wherein the first finger follower has first follower means arranged to follow the surface of the first cam means when the first finger follower is held in engagement with the first cam means, the second finger follower has a first end portion, an intermediate portion and a second end portion, the second finger follower being pivotally connected at the first end portion thereof to the first finger follower and the second finger follower having arranged in the intermediate portion thereof second follower means arranged to follow the surface of the second cam means when the second finger follower is held in engagement with the second cam means, the first cam means, the first follower means and the first finger follower comprise a first short duration cam mechanism for low speeds of the engine, the second cam means, the second follower means and the second finger follower comprise a second long duration cam mechanism for high speeds of the engine, the fulcrum means comprises movable fulcrum means on which the second finger follower is mounted at the second end portion thereof, said movable fulcrum means being movable between a first position wherein the second follower means is out of engagement with the second cam means and a second position where the second follower means is in engagement with the second cam means, and the fulcrum means comprises fixed fulcrum means about which the first finger follower is rockable for all positions of the movable fulcrum means.