Abstract: A vacuum pump with a primarily cylinder-shaped pump housing is provided. A bowl-shaped sound-absorbing cover is attached on the pump housing and a circumferential gap space for sound absorption is formed between the pump housing and the sound-absorbing cover. The pump housing has an end face in which at least one air outlet opening is arranged. An elastic upstream sound absorber element is arranged between the end face and the sound-absorbing cover so that an upstream chamber is formed therebetween into which the air flows from the air outlet opening. The upstream sound absorber element has a molded projection facing the end face with an air channel passing through the projection. The projection is arranged at a distance from the end face during operation of the vacuum pump. While the vacuum pump is idle, the projection makes contact with the end face through elastic deformation of the upstream sound absorber element, causing the air channel to be closed off and creating a check valve function.

Abstract: An arrangement of an electric vacuum pump, for example, in a vehicle, wherein a mounting element is provided on which the vacuum pump is installed, and wherein the vacuum pump comprises a pump chamber part and a motor part, and wherein a longitudinal axis extends through the pump chamber part and the motor part. According to the invention, the vacuum pump has a horizontal arrangement with respect to a gravitational direction, wherein the installation of the vacuum pump on the mounting element is limited to two mounting points, and wherein a center of gravity of the vacuum pump lies on a connection axis between the two mounting points.

Abstract: An arrangement of an electric vacuum pump, for example, in a vehicle, wherein a mounting element is provided on which the vacuum pump is installed, and wherein the vacuum pump comprises a pump chamber part and a motor part, and wherein a longitudinal axis extends through the pump chamber part and the motor part. According to the invention, the vacuum pump has a horizontal arrangement with respect to a gravitational direction, wherein the installation of the vacuum pump on the mounting element is limited to two mounting points, and wherein a center of gravity of the vacuum pump lies on a connection axis between the two mounting points.

Abstract: A vacuum pump with a primarily cylinder-shaped pump housing is provided. A bowl-shaped sound-absorbing cover is attached on the pump housing and a circumferential gap space for sound absorption is formed between the pump housing and the sound-absorbing cover. The pump housing has an end face in which at least one air outlet opening is arranged. An elastic upstream sound absorber element is arranged between the end face and the sound-absorbing cover so that an upstream chamber is formed therebetween into which the air flows from the air outlet opening. The upstream sound absorber element has a molded projection facing the end face with an air channel passing through the projection. The projection is arranged at a distance from the end face during operation of the vacuum pump. While the vacuum pump is idle, the projection makes contact with the end face through elastic deformation of the upstream sound absorber element, causing the air channel to be closed off and creating a check valve function.

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: A pump includes a pump chamber in which a rotor with gates is supported so that it can rotate, an electric motor for driving the rotor, an outlet, and an inlet port that is fastened to a mounting plate and is in active connection with an inlet channel. The pump should be improved so that its service life and reliability are improved with minimal installation complexity in a vehicle, wherein intense cleaning of lines and devices connected on the suction side can be eliminated. This is achieved in that a filter is arranged in the area of the inlet channel between the mounting plate and the pump chamber.

Abstract: A pump includes a pump chamber in which a rotor with gates is supported so that it can rotate, an electric motor for driving the rotor, a muffler that encloses a volume in the area of the pump chamber, wherein the volume is in active connection with an outlet port and a front muffler that is arranged within the muffler. To improve the service life and reliability of the pump in a vehicle with minimal installation expense, it is proposed that a filter is integrated into the front muffler.

Abstract: A pump includes a pump chamber in which a rotor with gates is supported so that it can rotate, an electric motor for driving the rotor, an outlet, and an inlet port that is fastened to a mounting plate and is in active connection with an inlet channel. The pump should be improved so that its service life and reliability are improved with minimal installation complexity in a vehicle, wherein intense cleaning of lines and devices connected on the suction side can be eliminated. This is achieved in that a filter is arranged in the area of the inlet channel between the mounting plate and the pump chamber.

Abstract: A pump includes a pump chamber in which a rotor with gates is supported so that it can rotate, an electric motor for driving the rotor, a muffler that encloses a volume in the area of the pump chamber, wherein the volume is in active connection with an outlet port and a front muffler that is arranged within the muffler. To improve the service life and reliability of the pump in a vehicle with minimal installation expense, it is proposed that a filter is integrated into the front muffler.