Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1994-05-31
1995-07-11
Yuen, Henry O.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 905, 123 9055, 74569, F01L 134, F01L 116
Patent
active
054311330
ABSTRACT:
A low mass two-step valve lifter has concentric inner and outer cylindrical cam followers engagable by radially disposed axially aligned lock pins in the outer high lift follower. Both inner and outer followers have cylindrically crowned cam engaging surfaces for high lift capability and low load eccentricity. The lock pins are positioned on the lifter thrust axis normal to the direction of the engine camshaft axis and the skirt has upward seal extensions and downward extending skirt portions adjacent the lock pin openings to maintain seal area. Other skirt portions are cut away to reduce weight. Vent holes in the lock pins discharge collected oil that might interfere with fast pin engagement. A separate passage is provided to feed oil to a hydraulic lash adjuster disposed in the inner follower cylinder. A single guide pin aligns the dual followers with the external bore oil ports and the camshaft cams. Additional features are also disclosed.
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De Minco Christopher M.
Nather Scott H.
Spath Mark J.
Barr Jr. Karl F.
General Motors Corporation
Lo Weilun
Yuen Henry O.
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