Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Reexamination Certificate
2007-08-28
2007-08-28
Chang, Ching (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
C123S090170, C123S090120, C464S160000
Reexamination Certificate
active
11244729
ABSTRACT:
The invention relates to a device (101) for altering the control times of gas exchange valves of an internal combustion engine, having a hydraulic actuating device (102) and a control valve (103). The device (101) according to the invention is provided with centre-position locking of a hydraulic actuating device (102). Furthermore, the device (101) according to the invention ensures that if an actuating unit (112) which governs the control valve (103) fails, the hydraulic actuating device (102) is locked in the central position and the locking is maintained until the actuating unit (112) is repaired. Furthermore, the device (101) according to the invention allows the internal combustion engine to be started in a locked position in a central position without a moveable element (105) of the hydraulic actuating device (102) striking a side wall of a pressure space (104) when the internal combustion engine is started.
REFERENCES:
patent: 5669343 (1997-09-01), Adachi
patent: 5878782 (1999-03-01), Nakajima
patent: 6443112 (2002-09-01), Kinugawa
Chang Ching
Muserlian Charles A.
Schaeffler KG
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