Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1990-07-06
1991-10-15
Cross, E. Rollins
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9031, F01L 134
Patent
active
050564773
ABSTRACT:
An apparatus for adjusting an angular rotational relationship of a camshaft, serving in particular to actuate gas exchange valves of an internal combustion engine, with respect to its drive element, which apparatus has two control motors acting counter to one another, the mutually corresponding movable walls of which are coupled to one another, wherein to reduce an expense for furnishing control fluid and generating pressure in this control fluid the work chambers of the control motors are on the one hand both connected via a respective check valve, to a control fluid pressure source and on the other hand can be made to communicate selectively with one another directly via a control valve or can be disconnected from one another via this valve, so that torque fluctuations of the camshaft are exploited for generating pressure in one of the work chambers at a time and the resultant pressure is exploited purposefully at certain times for adjustment with subsequent relocking of the work chambers.
REFERENCES:
patent: 4627825 (1986-12-01), Bruss et al.
patent: 4762097 (1988-08-01), Baker
patent: 4858572 (1989-08-01), Shirai et al.
patent: 4903650 (1990-02-01), Ohlendorf et al.
patent: 5002023 (1991-03-01), Butterfield et al.
Linder Ernst
Rembold Helmut
Cross E. Rollins
Greigg Edwin E.
Greigg Ronald E.
Lo Weilun
Robert & Bosch GmbH
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