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AssigneeRobert Bosch GmbH
InventorsErnst Linder, Helmut Rembold
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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.
An apparatus for adjusting a rotational angular relationship of a camshaft (6), serving in particular to actuate gas exchange valves of an internal combustion engine, to its drive element (15), having two control motors (1, 2) actuated by a control pressure medium with said control motors located opposite one another in an adjusting direction for rotation of the camshaft relative to the drive element, each control motor having two first walls (10, 11), movable relative to one another in the adjusting direction, and second walls (12, 13) which are each coupled to one another in such a way that upon adjustment in the adjusting direction, the first or second walls are adjusted in the same direction, and in this process the volume enclosed in a work chamber, defined by one first and one second wall each, increases whenever the volume in the other work chamber decreases, and these first and second work chambers (7, 8) defined by the first and second walls can be made to communicate via a valve with a control pressure fluid source, characterized in that the volumes enclosed in the work chambers (7, 8) upon an adjustment are increased and decreased by equal amounts, and the work chambers are made to communicate with the control pressure fluid source via a respective check valve (19, 21) which opens toward the work chamber, and can be made to communicate with one another directly via a control valve (24) controlled by a control device (25).
Dependencies are inferred from the claim text.