| 摘要 |
A variable timing system for i.c. engines, especially for motor vehicles, with suction and/or exhaust valves provided with hydraulic tappets in which the position of the oil inlet passages within the chamber of the hydraulic tappet can be selectively regulated in such a manner as to appropriately vary the moment at which they become closed by the cup member of the tappet, thus either retarding or advancing the opening of the valve i.e. diminishing or increasing its lift continuously from zero to a maximum value.
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