Device for separating oil from gas in the crankcase of an internal combustion engine

A separation device for purifying blow-by gas from a crankcase of an internal combustion engine, mountable between an inlet for loaded gas and a line for discharging purified gas, the separation device comprising:

• a separation section for separating oil from the blow-by gas, the separation section having each of:
• a transfer wall which includes a peripheral portion having at least one accelerated distribution opening that allows the gas flowing in the inlet to pass through the transfer wall;
• a deflection wall having an oil guiding surface and positioned in an area of passage for at least one gas flow having passed through said at least one accelerated distribution opening, so that the deflection wall forms a gas-flow deflection wall;
• an auxiliary opening separate from the accelerated distribution opening and made in the transfer wall;
• a valve;
• and
• a return member arranged behind the auxiliary opening, on the deflection wall side,
• wherein the valve has a movable closure element and is biased by the return member towards a closed position in which the closure element hermetically closes the auxiliary opening, the return member being configured to allow all or part of the closure element to approach the oil guiding surface in case of overpressure at the inlet side, the peripheral portion partly surrounding the valve,
• wherein the auxiliary opening defines a passage bypassing the accelerated distribution opening in case of overpressure at the inlet side, and
• wherein the closure element bears against an inner annular face of the transfer wall, the peripheral portion being arranged at the end of a projection that protrudes toward the deflection wall from the inner annular face.

A separation device for purifying blow-by gas from a crankcase of an internal combustion engine, mountable between an inlet for loaded gas and a line for discharging purified gas, the separation device comprising:

• a separation section for separating oil from the blow-by gas, the separation section having each of:
• a transfer wall which includes a stationary wall portion having at least one accelerated distribution opening that allows the gas flowing in the inlet to pass through the transfer wall;
• an auxiliary opening separate from the at least one accelerated distribution opening and made in the transfer wall;
• a deflection wall having an oil guiding surface and positioned in an area of passage for at least one gas flow having passed through said at least one accelerated distribution opening, so that the deflection wall forms a gas-flow deflection wall;
• a valve;
• and
• a return member arranged behind the auxiliary opening, on the deflection wall side,
• wherein an impingement chamber is delimited between the transfer wall and the oil guiding surface of the deflection wall, the deflection wall including a housing of fixed guiding orientation, the housing directly opening in the impingement chamber through the oil guiding surface,
• wherein the valve has a rod received in the housing of fixed guiding orientation so that the valve is configured to move linearly through the impingement chamber due to linear movement of the rod inside the housing,
• wherein the valve has a movable closure element integral with the rod and is biased by the return member towards a closed position in which the closure element hermetically closes the auxiliary opening, the return member being configured to allow all or part of the closure element to approach the planar oil guiding surface in case of overpressure at the inlet side,
• wherein the closure element is an unpierced element that is in contact with a valve seat region included in the transfer wall in the closed position, the valve seat region surrounding the auxiliary opening,
• wherein the valve seat region is distinct and spaced from the stationary wall portion, and
• wherein the auxiliary opening defines a passage bypassing the accelerated distribution opening in case of overpressure at the inlet side.