Machine of the axial piston pump type which can be used as a pump or as a motor

In a machine of the axial piston pump type which can be selectively used as a pump or as motor for a fluid medium, which comprises a cylinder drum which is mounted rotatably in a casing and in which working pistons are axially displaceable in working cylinders in axial bores distributed over the periphery of the cylinder drum, wherein piston rods are connected to the working pistons and have ends that run on a control cam which is fastened to the casing, said cam is concentric to a central shaft and extends undulatingly in the axial direction so that a rotary movement in the cylinder drum is converted into a reciprocating movement of the working pistons, or vice versa, and wherein at least one suction opening and one pressure opening are provided which are fixed to the casing and which communicate with said working cylinders, the improvement wherein said casing terminates in a tubular duct coaxial therewith that defines one of said openings and is of a diameter generally about the same as that of said drum to provide for the direct flow of said fluid medium to said working cylinders without undergoing a change in the direction of flow, said tubular duct terminating in a first connecting flange, and a second duct defines the other of said openings and terminates in a second connecting flange and extends to the side of said tubular duct, said cylinder drum is closed by a closure disc at a free end thereof against which a closure plate fastened to said casing is elastically pressed, and a leakage current valve is inserted into said free end of said cylinder drum.

In a machine of the axial piston pump type which can be selectively used as a pump or as motor for a fluid medium, which comprises a cylinder drum which is mounted rotatably in a casing and in which working pistons are axially displaceable in working cylinders in axial bores distributed over the periphery of the cylinder drum, wherein piston rods are connected to the working pistons and have ends that run on a control cam which is fastened to the casing, said cam is concentric to a central shaft and extends undulatingly in the axial direction so that a rotary movement in the cylinder drum is converted into a reciprocating movement of the working pistons, or vice versa, and wherein at least one suction opening and one pressure opening are provided which are fixed to the casing and which communicate with said working cylinders, the improvement wherein said casing terminates in a tubular duct coaxial therewith that defines one of said openings and is of a diameter generally about the same as that of said drum to provide for the direct flow of said fluid medium to said working cylinders without undergoing a change in the direction of flow, said tubular duct terminating in a first connecting flange, and a second duct defines the other of said openings and terminates in a second connecting flange and extends to the side of said tubular duct, and characterized by two machines each as defined above, in which the cylinder drums of both machines are coupled together.

In a machine of the axial piston pump type which can be selectively used as a pump or as motor for a fluid medium, which comprises a cylinder drum which is mounted rotatably in a casing and in which working pistons are axially displaceable in working cylinders in axial bores distributed over the periphery of the cylinder drum, wherein piston rods are connected to the working pistons and have ends that run on a control cam which is fastened to the casing, said cam is concentric to a central shaft and extends undulatingly in the axial direction so that a rotary movement in the cylinder drum is converted into a reciprocating movement of the working pistons, or vice versa, and wherein at least one suction opening and one pressure opening are provided which are fixed to the casing and which communicate with said working cylinders, the improvement wherein said casing terminates in a tubular duct coaxial therewith that defines one of said openings and is of a diameter generally about the same as that of said drum to provide for the direct flow of said fluid medium to said working cylinders without undergoing a change in the direction of flow, said tubular duct terminating in a first connecting flange of a diameter generally about the same as that of said drum, and a second duct defines the other of said openings and terminates in a second connecting flange and extends to the side of said tubular duct, that end of each piston rod which is guided by the control cam is in the form of a ball mounted for universal rotation, and said ball is mounted for universal rotation, with play, in a rider.

In a machine of the axial piston pump type which can be selectively used as a pump or as motor for a fluid medium, which comprises a cylinder drum which is mounted rotatably in a casing and in which working pistons are axially displaceable in working cylinders in axial bores distributed over the periphery of the cylinder drum, wherein piston rods are connected to the working pistons and have ends that run on a control cam which is fastened to the casing, said cam is concentric to a central shaft and extends undulatingly in the axial direction so that a rotary movement in the cylinder drum is converted into a reciprocating movement of the working pistons, or vice versa, and wherein at least one suction opening and one pressure opening are provided which are fixed to the casing and which communicate with said working cylinders, the improvement wherein said casing terminates in a tubular duct coaxial therewith that defines one of said openings and is of a diameter generally about the same as that of said drum to provide for the direct flow of said fluid medium to said working cylinders without undergoing a change in the direction of flow, said tubular duct terminating in a first connecting flange of a diameter generally about the same as that of said drum, and a second duct defines the other of said openings and terminates in a second connecting flange and extends to the side of said tubular duct, said cylinder drum is closed by a closure disc at a free end thereof against which a closure plate fastened to said casing is elastically pressed, and a leakage current valve is inserted into said free end of said cylinder drum.

In a machine of the axial piston pump type which can be selectively used as a pump or as motor for a fluid medium, which comprises a cylinder drum which is mounted rotatably in a casing and in which working pistons are axially displaceable in working cylinders in axial bores distributed over the periphery of the cylinder drum, wherein pistons rods are connected to the working pistons and have ends that run on a control cam which is fastened to the casing, said cam is concentric to a central shaft and extends undulatingly in the axial direction so that a rotary movement in the cylinder drum is converted into a reciprocating movement of the working pistons, or vice versa, and wherein at least one suction opening and one pressure opening are provided which are fixed to the casing and which communicate with said working cylinders, the improvement wherein said casing terminates in a tubular duct coaxial therewith that defines one of said openings and is of a diameter generally about the same as that of said drum to provide for the direct flow of said fluid medium to said working cylinders without undergoing a change in the direction of flow, said tubular duct terminating in a first connecting flange of a diameter generally about the same as that of said drum, and a second duct defines the other of said openings and terminates in a second connecting flange and extends to the side of said tubular duct, and characterized by two machines each as defined above, in which the cylinder drums of both machines are coupled together.