Electrohydraulic actuator for a brake system

An electrohydraulic actuator for a brake system, comprising:

• a housing which defines an interior space and has a first opening and a second opening;
• a master brake cylinder which is positioned in the first opening and is attached to the housing in such a way that the first opening is sealed in a fluid-tight manner;
• an electric motor arranged on the housing;
• a transmission which is accommodated in the interior space of the housing and is kinematically coupled to the master brake cylinder, wherein the transmission includes a transmission intermediate part which can be moved along a longitudinal axis and subdivides the housing, in relation to the longitudinal axis, into a first housing region, in which the master brake cylinder is arranged, and a second housing region, which faces the second opening;
• and
• a compensating membrane which closes the second opening in a fluid-tight manner and is elastically deformable in order to reduce a pressure difference between the first housing region and the second housing region in the event of an axial displacement of the transmission intermediate part, wherein the transmission includes an actuating part which can be moved along the longitudinal axis and is kinematically coupled to the master brake cylinder, and a guide part which is coupled to the actuating part and is guided along the longitudinal axis, wherein the guide part forms the transmission intermediate part, wherein the actuating part is a threaded spindle, wherein the transmission includes a spindle nut which is in engagement with the threaded spindle, and an input shaft, which is drivable by the electric motor and is in engagement with the spindle nut in order to rotate it about the longitudinal axis.

An electrohydraulic actuator for a brake system, comprising:

• a housing which defines an interior space and has a first opening and a second opening;
• a master brake cylinder which is positioned in the first opening and is attached to the housing in such a way that the first opening is sealed in a fluid-tight manner;
• an electric motor arranged on the housing;
• a transmission which is accommodated in the interior space of the housing and is kinematically coupled to the master brake cylinder, wherein the transmission includes a transmission intermediate part which can be moved along a longitudinal axis and subdivides the housing, in relation to the longitudinal axis, into a first housing region, in which the master brake cylinder is arranged, and a second housing region, which faces the second opening;
• and
• a compensating membrane which closes the second opening in a fluid-tight manner and is elastically deformable in order to reduce a pressure difference between the first housing region and the second housing region in the event of an axial displacement of the transmission intermediate part, wherein the transmission includes an actuating part which can be moved along the longitudinal axis and is kinematically coupled to the master brake cylinder, and a guide part which is coupled to the actuating part and is guided along the longitudinal axis, wherein the guide part forms the transmission intermediate part, wherein the guide part is a disk, which includes on its outer circumference at least one first guide element including a projection, which is in engagement with a second guide element which includes a guide groove of the housing extending in parallel with the longitudinal axis.