Low friction high speed rocker arm
A valve train is described for an internal combustion engine comprising, a camshaft mounted close above the cylinder head face of the engine, a one-piece essentially U-shaped rocker arm mounted above the camshaft for an arcuate movement and defined by a bottom wall integral with a pair of laterally spaced upstanding side walls. The bottom wall has a cylindrical fulcrum surface projecting upwardly. A lash adjuster fixedly supports above the rocker arm against lateral movement and has a lower surface engaging the cylindrical fulcrum surface with a contact establishing a pure rolling motion without friction of the rocker arm upon the lash adjuster lower surface. A reciprocatingly mounted valve stem engages one end of the rocker arm for reciprocation of the valve. The other end of the rocker arm rotatably supports a dual function roller engagable with a cam lobe on the camshaft for arcuate pivoting of the rocker arm about its fulcrum upon rotation of the camshaft. Support means supports the roller for both an arcuate movement of its axis of rotation along a predetermined path providing a pure rolling motion of the rocker arm about its fulcrum upon the lash adjuster surface. This confines the roller and arm in a manner preventing a longitudinal sliding movement of the rocker arm fulcrum surface relative to the lash adjuster surface.
- Assignee:
- Ford Motor Co., Dearborn, MI
- Patent Number(s):
- US 4682575
- OSTI ID:
- 6044506
- Resource Relation:
- Patent File Date: Filed date 31 Mar 1986
- Country of Publication:
- United States
- Language:
- English
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