The invention relates to a motor vehicle vacuum pump having a pump housing surface, on which a noise absorption cap is mounted, said cap defining a noise damping volume.

The present invention addresses the problem of standardizing a front shell of a booster shell of a negative pressure-type booster device by modifying the shape of a reinforcement rib provided to the front shell so as to satisfy the demand for varying the installation pitch and installation angle of tie-rod holes with one and the same front shell. A front shell configuring a booster shell of a negative pressure-type booster device in combination with a rear shell includes a reinforcement rib formed by bending the shells, wherein the reinforcement rib is formed along a virtual ellipse of which the center is located at the center of the front shell, with the major axes of the ellipse disposed on a line connecting the centers of two tie-rod holes provided in the front shell.

The present invention addresses the problem of standardizing a front shell of a booster shell of a negative pressure-type booster device by modifying the shape of a reinforcement rib provided to the front shell so as to satisfy the demand for varying the installation pitch and installation angle of tie-rod holes with one and the same front shell. A front shell configuring a booster shell of a negative pressure-type booster device in combination with a rear shell includes a reinforcement rib formed by bending the shells, wherein the reinforcement rib is formed along a virtual ellipse of which the center is located at the center of the front shell, with the major axes of the ellipse disposed on a line connecting the centers of two tie-rod holes provided in the front shell.

A housing assembly for a hydraulic assembly. The housing assembly includes a housing part at least partially enclosing an internal volume, having a through-opening extending between a housing-part inner face directed toward the internal volume and a housing-part outer face oriented in the opposite direction thereto, a region of the inner face surrounding the through-opening forming a depression; a tension anchor extending with an inner portion in the internal volume of the housing part and protruding through the through-opening, an outer portion of the tension anchor protruding beyond the outer face of the housing part; an anchor nut screwed onto the inner portion of the tension anchor and having a sealing face; and a sealing element arranged in the depression and bearing on the inner portion of the tension anchor, on the region of the inner face surrounding the through-opening, and on the sealing face of the anchor nut.