Abstract: A metering valve for a pump unit for feeding fuel from a tank to an internal combustion engine; the metering valve having: a sleeve having an axis A and provided with a first open end for receiving a thruster, a second opposite end provided with an opening for axially discharging the fuel and at least one side opening for feeding fuel; a plug-shaped piston housed slidably along the axis A inside the sleeve, the piston being provided with a closed end having an outer surface in contact with the thruster, an open opposite end and at least one side opening; a plug housed inside the discharge opening of the sleeve and provided with an axial opening; a spring arranged between the plug and the inner surface of the closed end of the sleeve.

Abstract: A metering valve for a pump unit for feeding fuel from a tank to an internal combustion engine; the metering valve comprising: a sleeve having an axis A and provided with a first open end for receiving a thruster, a second opposite end provided with an opening for axially discharging the fuel and at least one side opening for feeding fuel; a plug-shaped piston housed slidably along the axis A inside the sleeve, the piston being provided with a closed end having an outer surface in contact with the thruster, an open opposite end and at least one side opening; a plug housed inside the discharge opening of the sleeve and provided with an axial opening; a spring arranged between the plug and the inner surface of the closed end of the sleeve.

Abstract: The invention relates to a rotary piston pump (16) for conveying a fluid, comprising at least two rotors (52) with conveyor elements (53), a rotational movement being implementable thereby about an rotational axis (61), a working chamber on the at least two rotors (52), a multi-part housing (42) with a first housing part (44) and a second housing part (43), at least two radial bearing shapes (37, 38) being designed on the housing (42) to act as a radial sliding bearing for the at least two rotors (52), and the at least two radial bearing shapes (37, 38) being designed on only one of said housing parts (44).

Abstract: The invention relates to a cylinder head blank (9) for a high-pressure pump (1), which is in particular configured as a radial or in-line piston pump for fuel injection systems of air-compressing, auto-ignition internal combustion engines, comprising a base (10) having a high-pressure outlet (16) and a plurality of low-pressure connecting points (13-15). Here, the plurality of low-pressure connecting points (13-15) are closed in a raw state, wherein a low-pressure connection (11) can be fitted to each of the low-pressure connecting points (11). The invention further relates to a cylinder head for a high-pressure pump (1) and to a high-pressure pump (1).

Abstract: The invention relates to a cylinder head blank (9) for a high-pressure pump (1), which is in particular configured as a radial or in-line piston pump for fuel injection systems of air-compressing, auto-ignition internal combustion engines, comprising a base (10) having a high-pressure outlet (16) and a plurality of low-pressure connecting points (13-15). Here, the plurality of low-pressure connecting points (13-15) are closed in a raw state, wherein a low-pressure connection (11) can be fitted to each of the low-pressure connecting points (11). The invention further relates to a cylinder head for a high-pressure pump (1) and to a high-pressure pump (1).

Abstract: A spring retaining sleeve includes a cylinder press-fit connection surface which has a press-fit diameter and a press-fit length. To enable cost-effective production of a stable press-fit assembly, at least one end of the cylinder press-fit connection surface, an optimized insertion chamfer for long press-fit assemblies is provided with a ratio of press-fit diameter to press-fit length of greater than thirty five percent.

Abstract: The high-pressure pump has at least one pump element which has a pump plunger which is driven in a reciprocating motion and defines a pump working space into which fuel is drawn in from a fuel feed via an inlet valve during the suction stroke of the pump plunger and from which fuel is displaced into a high-pressure region via an outlet valve during the delivery stroke of the pump plunger. The inlet valve and/or the outlet valve has a valve member at least approximately in the shape of a ball which acts as a sealing surface with a valve seat arranged in a valve housing. The valve member, in its open state, is lifted with its sealing surface from the valve seat, a first cross section of flow is cleared between the valve member and the valve seat, and downstream of the first cross section of flow, a second cross section of flow is formed between the valve member and the valve housing.

Abstract: The invention relates to a spring retaining sleeve having a cylinder press-fit connection surface which has a press-fit diameter and a press-fit length. To enable cost-effective production of a stable press-fit assembly, at least one end of the cylinder press-fit connection surface, an optimized insertion chamfer for long press-fit assemblies is provided with a ratio of press-fit diameter to press-fit length of greater than thirty five percent.

Abstract: The invention relates to a high-pressure fuel pump for a fuel injection system of an internal combustion engine, having a pump housing and with at least one pump element of a piston which is driven by a cam which interacts with a roller. The free ends of the roller are bounded by two side run-on surfaces which come into contact with mating surfaces during the operation of the high-pressure fuel pump. In order to provide a high-pressure fuel pump which can be produced cost-effectively and has a long service life, the side run-on surfaces are designed as circular ring disc surfaces and, in a central internal region, are released from contact with the mating surfaces.

Abstract: The high-pressure pump has at least one pump element which has a pump plunger which is driven in a reciprocating motion and defines a pump working space into which fuel is drawn in from a fuel feed via an inlet valve during the suction stroke of the pump plunger and from which fuel is displaced into a high-pressure region via an outlet valve during the delivery stroke of the pump plunger. The inlet valve and/or the outlet valve has a valve member at least approximately in the shape of a ball which interacts by means of a sealing surface with a valve seat arranged in a valve housing. By means of the valve member, in the open state, when said valve member is lifted with its sealing surface from the valve seat, a first cross section of flow is cleared between the valve member and the valve seat, and downstream of the first cross section of flow, a second cross section of flow is formed between the valve member and the valve housing.

Abstract: The invention relates to an outlet connection of a fluid high-pressure light, in particular a high-pressure line for fuel, and comprises an outlet bore, an outlet valve that is situated in said bore, the valve element of which can be displaced in said bore and can be controlled by the pressure prevailing in the high-pressure line in opposition to the action of a spring element, a spring retainer inserted into the outlet bore and fixed in the latter and on which the spring element is supported, and an external thread.

Abstract: A high-pressure pump has at least one pump element, with a pump piston which is guided displaceably in a cylinder bore of a housing part of the high-pressure pump and is driven in a reciprocating motion and defines a pump work chamber in the cylinder bore, into which chamber fuel is aspirated via an inlet valve in the intake stroke of the pump piston. The inlet valve has a pistonlike valve member, which with a sealing face cooperates with a valve seat for controlling the communication of the pump work chamber with the fuel inlet. The valve member is disposed with a head, on which the sealing face is embodied, in the pump work chamber and protrudes out of the pump work chamber with a shaft adjoining the head. The valve seat is formed in the housing part at a transition from the cylinder bore to a bore of smaller diameter adjoining the cylinder bore.

Abstract: A high-pressure pump has at least one pump element including a pump piston defining a work chamber and driven at least indirectly by a drive shaft in a reciprocating motion, counter to the force of a restoring spring. The pump piston is braced on the drive shaft at least indirectly via a sleevelike tappet, and the restoring spring engages at least the pump piston. A support element in the tappet braces the pump piston toward the drive shaft and is braced at least indirectly on the drive shaft. The restoring spring, via a spring plate, engages the pump piston and the tappet. The spring plate is elastically deformable in the direction of motion of the pump piston in such a way that as a result of its elastic deformation, deviations in the position of its contact faces on the pump piston and on the tappet are compensated for.

Abstract: A check valve having a valve housing inserted into a receptacle in which housing a pistonlike valve member is guided longitudinally displaceably and cooperating with a valve seat on the valve housing. The valve member is urged in the closing direction by a prestressed closing spring and in the opening direction by the pressure prevailing in an inlet, and the valve member is inserted into the valve housing from the side of the valve seat. The valve housing is embodied in one piece and is embodied as cup-shaped and has both a bottom and a jacket region that defines a recess. With the open end of its recess, the valve housing points out of the receptacle, and the valve seat is located on the bottom of the valve housing, facing away from the recess. With a shaft, the valve member protrudes through a bore in the bottom into the recess in which the closing spring is located.

Abstract: A high-pressure pump has at least one pump element, with a pump piston which is guided displaceably in a cylinder bore of a housing part of the high-pressure pump and is driven in a reciprocating motion and defines a pump work chamber in the cylinder bore, into which chamber fuel is aspirated via an inlet valve in the intake stroke of the pump piston. The inlet valve has a pistonlike valve member, which with a sealing face cooperates with a valve seat for controlling the communication of the pump work chamber with the fuel inlet. The valve member is disposed with a head, on which the sealing face is embodied, in the pump work chamber and protrudes out of the pump work chamber with a shaft adjoining the head. The valve seat is formed in the housing part at a transition from the cylinder bore to a bore of smaller diameter adjoining the cylinder bore.

Abstract: A high-pressure pump has at least one pump element including a pump piston defining a work chamber and driven at least indirectly by a drive shaft in a reciprocating motion, counter to the force of a restoring spring. The pump piston is braced on the drive shaft at least indirectly via a sleevelike tappet, and the restoring spring engages at least the pump piston. A support element in the tappet braces the pump piston toward the drive shaft and is braced at least indirectly on the drive shaft. The restoring spring, via a spring plate, engages the pump piston and the tappet. The spring plate is elastically deformable in the direction of motion of the pump piston in such a way that as a result of its elastic deformation, deviations in the position of its contact faces on the pump piston and on the tappet are compensated for.

Abstract: A check valve having a valve housing inserted into a receptacle in which housing a pistonlike valve member is guided longitudinally displaceably and cooperating with a valve seat on the valve housing. The valve member is urged in the closing direction by a prestressed closing spring and in the opening direction by the pressure prevailing in an inlet, and the valve member is inserted into the valve housing from the side of the valve seat. The valve housing is embodied in one piece and is embodied as cup-shaped and has both a bottom and a jacket region that defines a recess. With the open end of its recess, the valve housing points out of the receptacle, and the valve seat is located on the bottom of the valve housing, facing away from the recess. With a shaft, the valve member protrudes through a bore in the bottom into the recess in which the closing spring is located.