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US 7,921,819 B2Granted
Valve actuating system
AssigneeMechadyne PLC
InventorsIan Methley, Timothy Mark Lancefield
Life of this patent
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Abstract
An actuating system for a gas exchange valve of an internal combustion engine is described which comprises two cams (12,14) associated with the valve (10), a summation linkage (22,24,30,32) for lifting the valve in dependence upon the sum of the instantaneous lifts of the two cams (12,14). A de-activating mechanism 34 is provided for selectively decoupling the summation linkage from one (12) of the two cams.
Claims7
An actuating system for a gas exchange valve of an internal combustion engine, comprising:
- first and second cams associated with the valve,
- a summation linkage for lifting the valve in dependence upon the sum of the instantaneous lifts of the first and second cams, the summation linkage comprising a first rocker driven by the first cam through a first cam follower and acting directly on the valve, and a second rocker driven by the second cam through a second cam follower and acting to displace the pivot of the first rocker,
- a decoupler for selectively isolating the second rocker from the second cam, and
- a stop for restricting rotation of the second rocker in one direction, so as to enable the valve to be lifted by the action of the first cam while the second rocker is isolated from the second cam.
1 more element
Dependencies are inferred from the claim text.