Brake actuating unit

A brake-by-wire actuating unit for a motor vehicle brake system, comprising:

• a housing;
• a first hydraulic cylinder/piston arrangement having an actuating piston which is guided displaceably in a corresponding housing and delimits a hydraulic pressure chamber to which a plurality of wheel brakes of the motor vehicle are connectable, the actuating piston being operable by a push rod which transmits an actuating force;
• an electrically controllable pressure supplying device in the form of a second hydraulic cylinder/piston arrangement, a piston of which can be displaced by an electric motor acting through a rotational-translational gear mechanism;
• a valve arrangement having a number of valves for setting wheel-individual brake pressures and for disconnecting or connecting the wheel brakes with the first cylinder/piston arrangement and with the pressure supplying device;
• wherein an axis of the electric motor of the pressure supplying device is arranged substantially perpendicular to a longitudinal axis of the first cylinder/piston arrangement, and the electric motor and hydraulic connections of the brake actuating unit, for connecting the wheel brakes, are arranged on a first lateral face of the housing;
• wherein the valve arrangement and the pressure supplying device are arranged at least partially inside the housing and on a second lateral face of the housing opposite the electric motor, the first and second lateral faces directly facing each other;
• and
• wherein at least one electrical connecting element is arranged on the housing, the electrical connecting element extending parallel to the axis of the electric motor, the electrical connecting element being adjacent to a third lateral face of the housing and opposite the push rod.

A brake-by-wire actuating unit for a motor vehicle brake system, comprising:

• a housing;
• a first hydraulic cylinder/piston arrangement having an actuating piston which is guided displaceably in a corresponding housing and delimits a hydraulic pressure chamber to which a plurality of wheel brakes of the motor vehicle are connectable, the actuating piston being operable by a push rod which transmits an actuating force;
• an electrically controllable pressure supplying device in the form of a second hydraulic cylinder/piston arrangement, a piston of which can be displaced by an electric motor acting through a rotational-translational gear mechanism;
• a valve arrangement having a number of valves for setting wheel-individual brake pressures and for disconnecting or connecting the wheel brakes with the first cylinder/piston arrangement and with the pressure supplying device;
• wherein the valve arrangement and the pressure supplying device are arranged at least partially inside the housing, an axis of the electric motor of the pressure supplying device being arranged substantially perpendicular to a longitudinal axis of the first cylinder/piston arrangement;
• and
• wherein the electric motor is arranged on a first face, and a pressure medium reservoir under atmospheric pressure or a hydraulic connection for a pressure medium reservoir under atmospheric pressure is arranged on a second face that is substantially perpendicular to the first face.