Hydrostatic clutch actuator

A hydrostatic actuator comprising:

• a first housing;
• a master cylinder, including:
• a second housing secured to the first housing;
• and,
• a piston axially displaceable in the second housing;
• a planetary rolling-contact gear system including:
• a sleeve;
• a gear spindle partially disposed within the first housing and partially disposed within the second housing;
• and,
• at least one planetary rolling body engaged with the sleeve and the gear spindle;
• an electric motor for rotating the gear spindle;
• and,
• a pressure chamber at least partially formed by the second housing and the piston, wherein:
• a first end of the gear spindle extends past the piston in a first axial direction;
• and,
• a second end of the gear spindle extends past the piston in a second axial direction opposite the first axial direction.

A hydrostatic actuator comprising:

• a first housing;
• a master cylinder, including:
• a second housing secured to the first housing;
• and,
• a piston axially displaceable in the second housing;
• a planetary rolling-contact gear system including:
• a sleeve;
• a gear spindle partially disposed within the first housing and partially disposed within the second housing;
• and,
• at least one planetary rolling body engaged with the sleeve and the gear spindle;
• an electric motor for rotating the gear spindle;
• and,
• a pressure chamber formed by the second housing and the piston, wherein:
• a first portion of the second housing is located radially between the sleeve and a portion of the piston;
• and,
• a second portion of the second housing is located radially outward of the piston.