Variable valve lift/timing mechanism
This patent describes variable lift, valve train for an internal combustion engine of the type having a body means defining a cylinder with a port. The valve train includes a valve with an axially extending valve stem located for axial movement between a valve closed an a valve open position relative to the port and normally biased to a valve closed position; a valve actuator spaced from the valve and operable to effect reciprocation of the valve; a rocker arm pivotably supported at one end on the valve stem and as its other end engaging the valve actuator; spring means mechanically interconnecting the valve actuator with the rocker arm. The body means including fixed over head support means extending in part over the rocker arm and spaced therefrom a predetermined distance; a lash adjuster including movable cylinder member means operatively positioned in the overhead support means with the cylinder member means having an outboard closed end projecting toward the valve stem is substantially coaxial alignment therewith, an eccentric means including an angularly movable eccentric operatively located in the overhead support means so as to substantially overlie the other end of the rocker arm, a reaction member pivotably supported adjacent to one end thereof by the outboard end of the cylinder member means, the opposite end of the reaction member being adapted to be engaged by the eccentric means; and a spring biased plunger means operatively supported by the overhead support means in position to abut the one end of the reaction member to bias the opposite end of the reaction member into engagement with the eccentric means; the reaction member and the rocker arm having opposed working surfaces of which is flat and the other of which has a cam surface contour of a predetermined profile.
- Assignee:
- General Motors Corp., Detroit, MI
- Patent Number(s):
- US 4774913
- OSTI ID:
- 6673143
- Resource Relation:
- Patent File Date: Filed date 5 Oct 1987
- Country of Publication:
- United States
- Language:
- English
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Variable valve lift/timing mechanism
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