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

1995-08-30

1996-07-30

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, F01L 1344

Patent

active

055401970

ABSTRACT:
A device (3) for adjusting valve timing in an internal combustion engine, disposed on a drive pinion (4) within a control gear of at least one camshaft (2) mounted in a cylinder head (1), which drive pinion (4) is in driving relationship with said camshaft (2), said device (3) comprising an adjusting piston (5) axially displaceable by a hydraulic medium and having two oppositely oriented helical gear sections (6,9), and first of said two helical gear sections (6) cooperates with a corresponding gear (7) of a driving element (8) connected to the drive pinion (4), while second of said two helical gear sections (9) cooperates with a gear (10) of a driven element (11) connected to the camshaft (2), an end region of the camshaft (2) facing the device (3) being circumferentially surrounded by a connecting bracket (14) positioned, as seen in camshaft direction, behind the device (3) and comprising at least one pressure medium connection (19) for hydraulic medium supply to the adjusting piston (5) characterized in that the connecting bracket (14) is made in one piece with a valve housing (16) of a hydraulic control valve which permits an optional feeding of hydraulic medium into one of two pressure chambers (12,13) defined on each side of the adjusting piston (5).

REFERENCES:
patent: 5012773 (1991-05-01), Akasaka et al.
patent: 5150671 (1992-09-01), Suga
patent: 5181485 (1993-01-01), Hirose et al.
patent: 5209193 (1993-05-01), Uchida et al.
patent: 5247914 (1993-09-01), Imai et al.
patent: 5301639 (1994-04-01), Satou
patent: 5305718 (1994-04-01), Muller

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