Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1998-12-11
2000-06-27
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9031, F01L 1344
Patent
active
060793821
ABSTRACT:
A locking device for a device (1) for varying the valve timing of gas exchange valves of an internal combustion engine, said device (1) comprising an element (3) which is attached to a crankshaft of the internal combustion engine and is in driving relationship with the crankshaft through a traction element, said device further comprising an element (4) attached rotationally fast to the camshaft (2), there being arranged between the two said elements (3, 4), at least two pressure chambers (5, 6) connected to a pressure medium supply and a hydraulically actuatable adjusting element (7) through which a connection for transmitting force from the element (3) attached to the crankshaft to the element (4) attached to the camshaft is established, and through which the two said elements (3, 4) can be made to rotate or be fixed relative to each other within an adjusting range. According to the invention, the element (4) attached to the camshaft (2) is arranged so as to penetrate axially through the element (3) attached to the crankshaft and comprises a free end (8) outside of the device (1), on which free end (8) is arranged a sealed locking element which is connected hydraulically to one or more of the pressure chambers (5, 6) of the device (1) while being axially displaceable on an axial guide (9), and with which locking element, when the pressure of the hydraulic medium falls below a pressure required for displacing the adjusting element (7) of the device, a non-rotatable force transmission connection between the element (3) attached to the crankshaft and the element (4) attached to the camshaft (2) in one or more angular positions thereof relative to each other can be established independently of the adjusting element (7) with the help of an auxiliary energy.
REFERENCES:
patent: 5775279 (1998-07-01), Ogawa et al.
patent: 5870983 (1999-02-01), Sato et al.
Dietz Joachim
Schafer Jens
Strauss Andreas
Ina Walzlager Schaeffler OHG
Lo Weilun
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