Electric linear motion actuator and electric brake system

An electric linear motion actuator comprising:

• a rotary shaft configured to be driven by an electric motor;
• a linear motion device which converts a rotation of the rotary shaft to a linear motion of a linear motion member such that the linear motion member is pressed against an object in an axially forward direction;
• a load sensor for detecting a magnitude of a load with which the linear motion member is pressed against the object;
• a temperature compensator for compensating for an influence of temperature on the load sensor;
• and
• a clearance controller for adjusting a clearance between the linear motion member and the object to a predetermined value by controlling the electric motor when pressure on the object from the linear motion member is released, wherein the clearance controller is configured to calculate a target rotational angle from a position of the electric motor corresponding to the magnitude of the load detected by the load sensor to a position of the electric motor where the clearance is at the predetermined value, and control the electric motor to rotate the electric motor by the target rotational angle,
• wherein the load sensor is located axially rearward of the linear motion device so as to axially support the linear motion device through a thrust bearing.