Device for adjusting valve timing in an internal combustion engi

Details Device for adjusting valve timing in an internal combustion engi Device for adjusting valve timing in an internal combustion engi

1995-12-11

1997-02-25

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

464 2, 123 9031, F01L 134, F01L 104

Patent

active

056051212

ABSTRACT:
A device (1) for adjusting valve timing in an internal combustion engine, disposed within a control gear of at least one camshaft on a drive pinion (3) which is in driving relationship with this camshaft, said device (1) comprising an adjusting piston (2) which is axially displaceable by a hydraulic medium and whose first and second end faces (11,12) delimit a first and a second pressure chambers (13,14) while a peripheral surface (15) of the adjusting piston (2) bears sealingly against a housing (16) which delimits the first and the second pressure chambers (13,14) radially outwards, the adjusting piston (2) comprising two oppositely oriented helical gear sections, (6,7) and first (6) of said two helical gear sections cooperates with a corresponding gear (5) of a driving element (4) connected to the drive pinion (3), while second (7) of said two helical gear sections cooperates with a gear (8) of a driven element (9) connected to the camshaft, a stop element (18,19) or an end portion of the housing being arranged in an axially outer portion of each of the two pressure chamberss (13,14) to define a position of maximum displacement of the camshaft, characterized in that the stop element (18) or the end portion of the housing of the first pressure chamber (13), towards which the adjusting piston (2) is displaced on starting of the engine, and/or the first end face (11) of the adjusting piston (2) facing this pressure chamber (13) comprises a hydraulic and/or pneumatic end position damping means for the adjusting piston (2).

REFERENCES:
patent: 5138985 (1992-08-01), Szodfridt et al.
patent: 5205248 (1993-04-01), Hara et al.
patent: 5215046 (1993-06-01), Takenaka et al.
patent: 5377639 (1995-01-01), Nakadouzono et al.
patent: 5474038 (1995-12-01), Golovatai-Schmidt et al.

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