Linear actuator

A linear actuator having a slide table that moves reciprocally in an axial direction of a cylinder body by means of a pressure fluid introduced from fluid inlet/outlet ports, comprising:

• a cylinder body having a cylinder chamber into which said pressure fluid is introduced, one side surface extending along the axial direction and in which fluid inlet/outlet ports are formed, another side surface in which an installation groove is formed for enabling installation of a detector for detecting a displacement amount of a piston disposed inside said cylinder chamber, and a pair of guide surfaces disposed substantially perpendicular to said side surfaces;
• mounting sections formed substantially parallel to an axis of said cylinder body and in substantially the same plane on said guide surfaces;
• a pair of grooves arranged symmetrically with respect to the axis of said cylinder body and recessed at a predetermined depth with respect to said mounting sections on said guide surfaces;
• a slide table disposed facing one of said guide surfaces and displaceable along the axial direction of said cylinder body;
• a cylinder mechanism effecting reciprocal movement of said slide table, under a displacement action of the piston disposed inside said cylinder chamber;
• and
• a guide mechanism, having a guide block mounted on one of said pair of guide surfaces and formed with circulating passages therein for rolling circulation of a plurality of rolling bodies, and for guiding said slide table along the axial direction of said cylinder body,
• wherein guide members of said guide block are inserted and supported respectively in said grooves, and
• wherein said guide mechanism is detachably mounted with respect to said guide surfaces, such that when said guide mechanism is mounted on said one guide surface, the other guide surface serves as a mounting surface for fixing said cylinder body to another component.