Electric brake apparatus and drive unit

An electric brake apparatus comprising:

• an electric motor;
• a rotational member coupled with the electric motor;
• a linear motion member threadedly engaged with the rotational member;
• a torque transmission member;
• a torque limiter mechanism disposed between the rotational member and the torque transmission member, the torque limiter mechanism being configured to cause the torque transmission member to rotate together with the rotational member until a rotational resistance force between the rotational member and the torque limiter mechanism exceeds a predetermined value;
• a fixation portion;
• and
• a torsion spring having a one-end portion connected to the torque transmission member and an opposite-end portion connected to the fixation portion.

A drive unit configured to provide power for pressing a frictional pad against a disk of a disk brake, the drive unit comprising:

• an electric motor;
• a rotational member configured to rotate based on driving of the electric motor;
• a linear motion member configured to linearly move due to the rotation of the rotational member;
• a torque transmission member;
• a torque limiter mechanism disposed between the rotational member and the torque transmission member, the torque limiter mechanism being configured to cause the torque transmission member to rotate together with the rotational member until a rotational resistance force between the rotational member and the torque limiter mechanism exceeds a predetermined value;
• a fixation portion;
• and
• an elastic member having a one-end portion connected to the torque transmission member and an opposite-end portion connected to the fixation portion, the elastic member being configured to store elastic energy therein due to a rotation of the torque transmission member relative to the fixation portion according to the rotation of the rotational member.