Internal-combustion engine switchable valve tappet

Details Internal-combustion engine switchable valve tappet Internal-combustion engine switchable valve tappet

1995-02-21

1996-09-24

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123198F, 74569, F01L 112, F01L 1300, F02D 1306

Patent

active

055580521

ABSTRACT:
A tappet is provided with a hydraulically actuated piston and a clutch member so that the valve is inoperative in a first switching position, whereas, it carries out lifting movements for controlling the charge cycle in a second switching position. The tappet interacts with a cam of a camshaft. A locking element is associated with the clutch member and interacts with a valve stem which unlocks the locking element in a defined cam path range and when a valve stem of the valve is dipped into a bore of the clutch member.

REFERENCES:
patent: 4711207 (1987-12-01), Bonvallet
patent: 4770137 (1988-09-01), Okabe et al.
patent: 5203289 (1993-04-01), Hara et al.
patent: 5343833 (1994-09-01), Shirai
patent: 5345904 (1994-09-01), Dopson et al.
patent: 5351662 (1994-10-01), Dopson et al.
patent: 5361734 (1994-11-01), Shirai
patent: 5402756 (1995-04-01), Bohme et al.
patent: 5431133 (1995-07-01), Spath et al.

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