Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1994-01-18
1995-10-03
Yuen, Henry C.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 905, F01L 114, F01L 116, F01L 124
Patent
active
054543533
ABSTRACT:
A tappet (1) for a valve operating mechanism for an internal combustion engine comprising a thin-walled jacket (3) guided in a bore (5) of a cylinder head (6) and provided in the cam direction with a circular ring-shaped bottom (4) which surrounds a circular bottom (16) of a concentrically arranged guide sleeve (7) in whose bore (9) a clearance compensation element (10) is arranged for longitudinal displacement, the jacket (3) comprising the circular ring-shaped bottom (4) and the guide sleeve (7) comprising the circular bottom (16) being engageable by cams of differing pitch and relatively displaceable axially with respect to each other and with respect to the bore (5) of the cylinder head (6), and a first, central cam (14) of smaller pitch and at least one cam (15) of larger pitch selectively engaging the circular bottom (16) and the circular ring-shaped bottom (4) respectively, characterized in that means are arranged in the jacket (3) which prevent an axial rotation of the tappet (1) in the bore (5) of the cylinder head (6) and at the same time also prevent an axial rotation of the guide sleeve (7) which is arranged concentrically in the tappet (1) and in whose bore the clearance compensation element (10) is mounted for longitudinal displacement, at least one axially acting pressure spring (22) being arranged between the circular ring-shaped bottom (4) and a radial flange (12) which projects from the guide sleeve (7) and is guided on an inner peripheral surface (13) of the jacket (3).
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Elendt Harald
Faria Christof
Fischer Gerald
Haas Michael
Maas Gerhard
INA Walzlager Schaeffler KG
Lo Weilun
Yuen Henry C.
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