Abstract: A vane pump with a pump housing in which a cam ring is constructed or arranged, and wherein a rotor is provided that is mounted in the cam ring so that it can rotate about a rotational axis , wherein the cam ring has an inner contour with a variable radius that varies between a maximum radius and a minimum radius in the circumferential direction about the rotational axis , wherein, in the radial gap between the inner contour and the rotor , a number of lift sections is constructed with pump chambers constructed in these sections, and wherein vane elements are mounted on the rotor , wherein these elements slide against the inner contour of the cam ring and limit the pump chambers in the circumferential direction. According to the invention, the radius of the inner contour varies about the rotational axis according to the function: r=r0+a·sin(n·?), where r0=(rmax+rmin)/2, a =(rmax?rmin)/2, and ?=phase angle of the radius (r) between (rmin) and (rmax) in the direction of rotation of the rotor .

Abstract: The invention relates to a vane cell pump comprising an electrical pump unit that has a pump chamber into and out of which a fluid can flow and also a rotor with a number of vanes to compress the fluid before flowing out from the pump chamber. The vane cell pump also comprises a sound-damping mechanism into which the fluid can flow after flowing through the pump chamber and that has a sound-damping cover attached to a part of the pump chamber and defining a sound-damping volume. A preliminary sound-damping mechanism with at least one preliminary sound-damping outlet from which the fluid can flow may be arranged within the sound-damping volume, wherein the preliminary sound-damping outlet has a cross-sectional profile tapering in the direction of fluid outflow.

Abstract: A damper for damping vibrations between a support and a device mounted on the same includes two elastic elements which can be attached to the support by means of a bolt and a securement means. The damper should be suitable for different material thicknesses of the support. This is achieved in that a step is constructed on an outer periphery of a first element, wherein a smaller cross-section formed by the step corresponds to the cross-section of an opening in the support which is functionally assigned thereto, and the part having the smaller cross-section is longer than a thickness of the support, and in that a bore hole is included in an end face of a second element, wherein the cross-section of the bore hole corresponds to that of the opening.

Abstract: A vane pump includes an electric drive unit with an electric motor and a motor shaft, a pump chamber attached on the electric drive unit, and a rotor having a plurality of blades. The rotor is arranged concentrically to the motor shaft within the pump chamber, and the motor shaft is engaged with the rotor by way of a tappet which is connected torsionally rigid with the motor shaft. The tappet has at least one tappet peg, which is engaged in a rotor recess, that corresponds to the tappet peg, wherein the at least one rotor recess has an oval shape, and the tappet peg is contoured in such a way that two first slightly curved contoured sections each form one contact area with one oblong planar section corresponding with one each of the rotor recesses.

Abstract: A vane pump with a pump housing in which a cam ring is constructed or arranged, and wherein a rotor is provided that is mounted in the cam ring so that it can rotate about a rotational axis , wherein the cam ring has an inner contour with a variable radius that varies between a maximum radius and a minimum radius in the circumferential direction about the rotational axis , wherein, in the radial gap between the inner contour and the rotor , a number of lift sections is constructed with pump chambers constructed in these sections, and wherein vane elements are mounted on the rotor , wherein these elements slide against the inner contour of the cam ring and limit the pump chambers in the circumferential direction. According to the invention, the radius of the inner contour varies about the rotational axis according to the function: r=r0+a·sin(n·?), where r0=(rmax+rmin)/2, a =(rmax?rmin)/2, and ?=phase angle of the radius (r) between (rmin) and (rmax) in the direction of rotation of the rotor .

Abstract: The invention relates to a vane cell pump (1) comprising an electrical drive unit with an electric motor and a motor shaft (6), a pump chamber (2) that connects to the electrical drive unit and has a pump ring (3), and also a rotor (4) that is arranged concentric to the motor shaft (6) within the pump chamber (2) and is in active connection with the motor shaft (6), wherein the rotor (4) has a number of guide slots (40) that extend inward from the outer circumference of the rotor and in each of which a vane (5) is arranged in a moveable manner with two vane ends (50, 51) opposite each other. The vane ends (50, 51) of each vane (5) have a mirror-symmetric design relative to the transverse center plane of the vane.

Abstract: The invention relates to a vane pump, comprising an electric drive unit having an electric motor and a motor shaft, a pump chamber, attached on the electric drive unit, a rotor having a plurality of blades, said rotor being arranged concentrically to the motor shaft within the pump chamber, wherein the motor shaft is engaged with the rotor by way of a tappet which is connected torsionally rigid with the motor shaft and the tappet comprises at least one tappet peg, which is engaged in a rotor recess that corresponds to the tappet peg, wherein the at least one rotor recess has an oval shape and the tappet peg is contoured in such a way that two first slightly curved contoured sections each form one contact area with one oblong planar section each of the rotor recess.

Abstract: The invention relates to a vane cell pump comprising an electrical pump unit that has a pump chamber into and out of which a fluid can flow and also a rotor with a number of vanes to compress the fluid before flowing out from the pump chamber. The vane cell pump also comprises a sound-damping mechanism into which the fluid can flow after flowing through the pump chamber and that has a sound-damping cover attached to a part of the pump chamber and defining a sound-damping volume. A preliminary sound-damping mechanism with at least one preliminary sound-damping outlet from which the fluid can flow may be arranged within the sound-damping volume, wherein the preliminary sound-damping outlet has a cross-sectional profile tapering in the direction of fluid outflow.

Abstract: An electric air-pump apparatus for motor vehicles has a mounting plate to which a housing of an electric motor and a pumping device are attached. A sound absorber is, formed by the mounting plate and a sound-absorber cap attached thereto, with the sound-absorber cap surrounding the pumping device. The sound-absorber cap is positioned on a first side of the mounting plate opposite from a second side of the mounting plate at which the electric motor is to be attached.