Device for variably adjusting control times of gas exchange valves of an internal combustion engine
First Claim
1. A device for variably adjusting timing control of gas exchange valves of an internal combustion engine, comprising:
- a drive element;
an output element;
a rotation angle limiting device;
a control valve; and
at least two counter-working pressure chambersit being possible to bring about a phase adjustment between the output element and the drive element by charging one of the pressure chambers with pressure medium while simultaneously discharging the other of the pressure chambers,the rotation angle limiting device preventing a phase relation from being altered when in a locked state,the rotation angle limiting device allowing the phase relation to be altered when in an unlocked state,it being possible to switch the rotation angle limiting device from the locked state to the unlocked state by charging same with pressure medium,the control valve comprising a valve housing and a control piston,exactly one inflow port, at least one outflow port, a control port and two working ports being embodied on the valve housing,the inflow port being connected to a pressure source, the outflow port being connected to a tank, the control port being connected to the rotation angle limiting device and the working ports each being connected to a respective pressure chamber, andthe control valve being arranged in a central receptacle of the output element,whereinthe inflow port is arranged outside the output element and the drive element in an axial direction,the working ports and the control port can he selectively connected to or disconnected from the inflow port, depending on a position of the control piston within the valve housing, andthe control piston comprises a first control chamber arranged and dimensioned so that communication can be established with the control port and the second working port, a second control chamber arranged and dimensioned so that communication can be established with the second working port, a third control chamber arranged and dimensioned to communicate with the inflow port in all positions of the control piston, and a fourth control chamber arranged and dimensioned so that communication can be established with the second working port or the first working port.
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Accused Products
Abstract
A device for variably adjusting control times of gas exchange valves of an internal combustion engine. The device has a drive element, an output element, a rotation angle limiting device and a control valve and counter-working pressure chambers are also provided. Phase adjustment between the output and drive element is initiated by applying pressure to one pressure chamber while discharging the other pressure chamber. The rotation angle limiting device can be locked or unlocked to prevent or allow phasing. The control valve has a valve housing and a control piston. An inflow connection, an outflow connection, a control connection and two working connections are embodied on the valve housing.
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Citations
11 Claims
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1. A device for variably adjusting timing control of gas exchange valves of an internal combustion engine, comprising:
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a drive element; an output element; a rotation angle limiting device; a control valve; and at least two counter-working pressure chambers it being possible to bring about a phase adjustment between the output element and the drive element by charging one of the pressure chambers with pressure medium while simultaneously discharging the other of the pressure chambers, the rotation angle limiting device preventing a phase relation from being altered when in a locked state, the rotation angle limiting device allowing the phase relation to be altered when in an unlocked state, it being possible to switch the rotation angle limiting device from the locked state to the unlocked state by charging same with pressure medium, the control valve comprising a valve housing and a control piston, exactly one inflow port, at least one outflow port, a control port and two working ports being embodied on the valve housing, the inflow port being connected to a pressure source, the outflow port being connected to a tank, the control port being connected to the rotation angle limiting device and the working ports each being connected to a respective pressure chamber, and the control valve being arranged in a central receptacle of the output element, wherein the inflow port is arranged outside the output element and the drive element in an axial direction, the working ports and the control port can he selectively connected to or disconnected from the inflow port, depending on a position of the control piston within the valve housing, and the control piston comprises a first control chamber arranged and dimensioned so that communication can be established with the control port and the second working port, a second control chamber arranged and dimensioned so that communication can be established with the second working port, a third control chamber arranged and dimensioned to communicate with the inflow port in all positions of the control piston, and a fourth control chamber arranged and dimensioned so that communication can be established with the second working port or the first working port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification