Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1998-05-06
1999-03-02
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9043, 123198F, F01L 1300
Patent
active
058757481
ABSTRACT:
A valve drive of an internal combustion engine, includes a switching mechanism incorporated in a support element for support of a cam follower disposed in driving relationship between a camshaft and the gas exchange valve for switching a gas exchange valve to different valve lift curves in response to an operation of a cam arrangement, whereby the switching mechanism has a hollow cylindrical housing defining an axis and received within an enveloping outer casing, an inner element axially displaceable relative to the housing and so received within the housing as to form at their interface an annular gap, and a coupling mechanism movable in a radial direction in a first radial bore arrangement so as to couple the inner element with the housing in a base circle phase of the cam arrangement by bridging the annular gap to thereby maintain a contact of the cam follower upon the cam arrangement, and movable in a radial direction in a second bore arrangement which is spaced from the first radial bore arrangement in direction of the axis so as to effect a disengagement of the cam follower from the cam arrangement in a phase of maximum cam lift.
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Haas Michael
Speil Walter
Feiereisen Henry M.
Ina Walzlager Schaeffler OHG
Lo Weilun
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