Hydrostatic actuator and arrangement of a hydrostatic actuator in a motor vehicle

A hydrostatic actuator for a motor vehicle comprising:

• a housing;
• an electric motor located within the housing, the electric motor including a rotor situated within a stator;
• a piston axially movable in the housing, the piston acting on a pressure chamber filled with a pressurizing agent;
• a rolling planetary transmission within the housing and including rolling planetary bodies and ring gear sections that interact with a spindle having a first axial end and a second axial end, the rolling planetary transmission converting a rotary propulsion of the electric motor to an axial motion of the piston such that the piston moves axially with respect to the spindle;
• and
• a single radial bearing supporting the spindle near the first axial end, the rolling planetary bodies and ring gear sections supported by the spindle between the first axial end and the second axial end such that the spindle extends entirely through the rolling planetary bodies, the ring gear sections and the piston, the spindle connected with the rotor towards the first axial end and the second axial end being a free end which extends away from the pressure chamber.