Pneumatic brake booster having a sealing element

A pneumatic brake booster having a booster housing, wherein the booster housing has at least two thin-walled shell elements and an elastomer sealing element, wherein the sealing element has a sealing bead, which is of encircling form radially at the outside, and at least one rolling diaphragm portion which adjoins the sealing bead, and the sealing bead is sealingly clamped in a clamping space between the shell elements, wherein the clamping space is formed by walls which are generated in the shell elements by deformation, wherein

• a rolling-diaphragm-side end wall of the clamping space is formed by an encircling radial shoulder of the first shell element,
• a radial outer wall is formed by a tubular projection which extends from the shoulder substantially in an axial direction,
• a radial inner wall is formed by a tubular, axially forwardly extending projection, which is folded at its front edge, of the second shell element,
• wherein a bead-side rear wall of the clamping space is formed by an encircling, radially outwardly projecting collar which is formed on the second shell element,
• wherein, between the rear wall and the outer wall of the clamping space, there are provided multiple positive locking portions which act in the circumferential direction and axially in the direction of the sealing bead, and
• wherein the multiple positive locking portions are arranged so as to be distributed in irregular fashion on the circumference of the shell elements.

A pneumatic brake booster having a booster housing, wherein the booster housing has at least two thin-walled shell elements and an elastomer sealing element, wherein the sealing element has a sealing bead, which is of encircling form radially at the outside, and at least one rolling diaphragm portion which adjoins the sealing bead, and the sealing bead is sealingly clamped in a clamping space between the shell elements, wherein the clamping space is formed by walls which are generated in the shell elements by deformation, wherein

• a rolling-diaphragm-side end wall of the clamping space is formed by an encircling radial shoulder of the first shell element,
• a radial outer wall is formed by a tubular projection which extends from the shoulder substantially in an axial direction,
• a radial inner wall is formed by a tubular, axially forwardly extending projection, which is folded at its front edge, of the second shell element,
• wherein a bead-side rear wall of the clamping space is formed by an encircling, radially outwardly projecting collar which is formed on the second shell element,
• wherein, between the projection and a wall region, which axially adjoins the shoulder, of the shell element, there is arranged an annular gap through which a region of the rolling diaphragm portion runs, wherein the wall region is of conical form in the region of the annular gap.