Actuator and Method for Producing Same

A method for producing an actuator that comprises a rolling element and two components which relatively move to each other via the rolling element, the method comprising:

• shooting at least either one surface of two surfaces subjected to rolling contact or sliding contact with each other with minute particles formed of a harder material than a material of the one surface and each having an angle on a surface of each minute particle to scrape at least the one surface concavely to form a large number of independent concavities each having a diameter of 0.5 to 100 μm and serving as a lubricant puddle.

A method for producing an actuator which comprises an inner race including a raceway surface, an outer race including a raceway surface facing with the raceway surface of the inner race, and a plurality of rollers disposed between both raceway surfaces in a freely rollable manner, the method comprising:

• a first process of performing a shot work of causing at least one of the inner race, the outer race, and the rolling element to be collided with particles each having at least one angle to form circular concavities in an entire surface of a work target by collision and convexities formed of an excess metal;
• and
• a second process of removing a part of each convexity to make the convexities smaller.