Abstract: According to the invention, the filter is fixed to the engine block by screwing it to an attached connecting sleeve. The connecting sleeve contains a bypass valve, in the form of a tubular piston sliding in a through-passage and pushed against an intermediate shoulder by a spring. By sliding, the piston opens or closes a radial passage establishing direct communication between the inlet passage and the through-passage of the device. If the filter element of the filter is clogged, the pressure rise in the inlet passage causes the piston to move and the radial passage to open to reduce the pressure rise and ensure a satisfactory flow of oil. This reduces pressure rises upstream of the filter and ensures sufficient lubrication of the engine even in the case of clogging of the filter.

Abstract: A cooling system comprises at least one common feed manifold carrying a series of nozzles and forming a mechanically rigid assembly, with fixing means for fixing in the engine and with hydraulic connection means for making a hydraulic connection to a feed circuit in the engine. The mechanically rigid assembly is fixed into the engine block from the lower face thereof, the fixing lugs being fixed to easily accessible regions of the engine block before fitting the crankcase. The connection means are fixed into the crankcase and connected to the outlet of the oil filter by a common valve. An internal combustion engine piston cooling system may therefore be fitted without having to modify the structure of the engine block.

Abstract: According to the invention, the filter is fixed to the engine block by screwing it to an attached connecting sleeve. The connecting sleeve contains a bypass valve, in the form of a tubular piston sliding in a through-passage and pushed against an intermediate shoulder by a spring. By sliding, the piston opens or closes a radial passage establishing direct communication between the inlet passage and the through-passage of the device. If the filter element of the filter is clogged, the pressure rise in the inlet passage causes the piston to move and the radial passage to open to reduce the pressure rise and ensure a satisfactory flow of oil. This reduces pressure rises upstream of the filter and ensures sufficient lubrication of the engine even in the case of clogging of the filter.

Abstract: Device to feed cooling and lubricating fluid to cooling and lubricating nozzles for the pistons of an internal combustion engine, having at least one valve with an upstream channel and a downstream channel, said valve having a blocking element able to move in a compartment to block an opening of a seat. The valve responds to the pressure of the cooling fluid by opening when the upstream pressure is greater than a threshold pressure and closing when the upstream pressure is less than the threshold pressure. A means of calibrated leakage connects the upstream channel to the downstream channel in parallel with the zone of closure of the valve.

Abstract: Device to feed cooling and lubricating fluid to cooling and lubricating nozzles for the pistons of an internal combustion engine, having at least one valve with an upstream channel and a downstream channel, said valve having a blocking element able to move in a compartment to block an opening of a seat. The valve responds to the pressure of the cooling fluid by opening when the upstream pressure is greater than a threshold pressure and closing when the upstream pressure is less than the threshold pressure. A means of calibrated leakage connects the upstream channel to the downstream channel in parallel with the zone of closure of the valve.

Abstract: A nozzle in accordance with the invention includes a nozzle body with a penetrating portion conformed to engage axially in a bore in the engine and to receive a cooling fluid arriving via said bore. An outlet structure includes two outlet tubes, each outlet tube being appropriately curved to create two jets of cooling fluid and to direct them toward respective different cooling areas of an engine piston.

Abstract: A cooling system comprises at least one common feed manifold carrying a series of nozzles and forming a mechanically rigid assembly, with fixing means for fixing in the engine and with hydraulic connection means for making a hydraulic connection to a feed circuit in the engine. The mechanically rigid assembly is fixed into the engine block from the lower face thereof, the fixing lugs being fixed to easily accessible regions of the engine block before fitting the crankcase. The connection means are fixed into the crankcase and connected to the outlet of the oil filter by a common valve. An internal combustion engine piston cooling system may therefore be fitted without having to modify the structure of the engine block.

Abstract: A nozzle in accordance with the invention includes a nozzle body with a penetrating portion conformed to engage axially in a bore in the engine and to receive a cooling fluid arriving via said bore. An outlet structure includes two outlet tubes, each outlet tube being appropriately curved to create two jets of cooling fluid and to direct them toward respective different cooling areas of an engine piston.

Abstract: A cooling nozzle in accordance with the invention cools the piston of an internal combustion engine. The nozzle includes a nozzle body with a penetrating part shaped to engage in a bore of the engine and to receive a cooling fluid. The nozzle includes an internal valve consisting of a piston guided and sliding in a guide bore of the nozzle body. The piston includes a head oriented in the upstream direction and bearing against an annular seat. The piston is urged towards the annular seat by a compression coil spring. The cooling nozzle for high-pressure engine cooling circuits and incorporating an internal valve obtained therefore has greater durability.

Abstract: A cooling nozzle in accordance with the invention cools the piston of an internal combustion engine. The nozzle includes a nozzle body with a penetrating part shaped to engage in a bore of the engine and to receive a cooling fluid. The nozzle includes an internal valve consisting of a piston guided and sliding in a guide bore of the nozzle body. The piston includes a head oriented in the upstream direction and bearing against an annular seat. The piston is urged towards the annular seat by a compression coil spring. The cooling nozzle for high-pressure engine cooling circuits and incorporating an internal valve obtained therefore has greater durability.