Hydraulic valve-play compensation element
AssigneeMahle Ventiltrieb GmbH
InventorMartin Lechner
Life of this patent
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Abstract
The invention relates to a hydraulic valve-play compensation element. The aim is to prevent any change in the length from taking place when the engine is at a standstill. To this end, the leakage oil is guided into the space between the high pressure valve (4) and the valve (5), where it then reinforces the sealing effect of valve (5). When the engine is in operation, the valve (4) is kept open irrespective of the direction of throughflow by means for producing a defined force, for example, a pressure-loaded piston or by electromagnetic means.
Claims7
A hydraulic valve-play compensation element for an internal combustion engine, with a cylinder part (1) and a piston part (2) displaceable in the cylinder part, whereby the cylinder part (1) and the piston part (2) are initially tensioned against each other by a spring (3), and enclose a high-pressure chamber, said chamber being closed by a check valve (4) located on a high pressure side;
- and with a second valve (5) located on a supply side upstream of the check valve (4) in the direction of the oil feed, whereby the valve (5) located on the supply side is closed by a return spring (10) when the engine is at a standstill, characterized in that when the check valve (4) is closed, leakage oil draining from the high-pressure chamber (20) is guided into the space (17) located between the check valve (4) and the valve (5), and reinforces there the sealing function of the valve (5) when the engine is standing still;
- that the valve (5) is opened when the engine is in operation by means for generating a defined force in the feeding direction;
- and that when the engine is operating, the valve (5) is kept open by the means for generating the defined force irrespective of the direction of through-flow of the lubricating oil.
Dependencies are inferred from the claim text.