Internal Combustion Engine Having A Motor Brake Assembly
AssigneeMAN Nutzfahrzeuge AG
InventorHans-Werner DILLY
Life of this patent
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Abstract
An internal combustion engine includes an exhaust valve for removing exhaust gas from a combustion chamber and an engine braking device with a hydraulic valve control unit by which the exhaust valve is held in an intermediate open position when the engine braking device is actuated. The internal combustion engine includes a hydraulic valve lash compensation mechanism for the exhaust valve and a control channel formed between the hydraulic valve control unit and an oil feed channel for feeding oil to the hydraulic valve control unit which can be closed by a closure element to compensate for valve lash of the exhaust valve. A counter-holder is constructed as a piston-cylinder unit that forms a variable stop for a valve bridge cooperating with the valve lash compensation mechanism.
Claims14
An internal combustion engine comprising:
- an exhaust valve configured to removing exhaust gas from a combustion chamber of the internal combustion engine;
- a valve bridge configured to support the exhaust valve;
- a rocker arm configured to displace the valve bridge;
- an oil feed channel of an oil circuit configured to supply oil;
- an engine braking device that comprises a hydraulic valve control unit arranged between the exhaust valve and the valve bridge, is connected to the oil feed channel by which the exhaust valve can be held in an intermediate open position when the engine braking device is actuated;
- a counter-holder constructed as a hydraulic piston-cylinder unit configured to furnish a stop for the valve bridge;
- a hydraulic valve lash compensation mechanism for the exhaust valve arranged between the rocker arm and the valve bridge and connected to the oil feed channel for supplying oil;
- and
- a control channel connected to the oil feed channel configured to feed oil to the hydraulic valve control unit that is closeable by a closure element to compensate for valve lash of the exhaust valve,
- wherein the counter-holder is configured to adapt the stop to a position of the valve lash compensation mechanism.
- The internal combustion engine according to claim 1, wherein the valve lash compensation mechanism comprises:
- a compensation piston guided in a first cylinder bore;
- a compensation space defined by the compensation piston;
- a first reset spring arranged in the compensation space;
- an oil supply channel that opens into the compensation space;
- and
- a first check valve configured to close the oil supply channel.
The internal combustion engine according to claim 2, wherein the valve lash compensation mechanism is integrated in the rocker arm.
The internal combustion engine according to claim 2, further comprising a connection channel arranged in the compensation piston that connects the oil feed channel to the control channel while bypassing the compensation space.
Dependencies are inferred from the claim text.