Electric pump

An electric pump, comprising:

• a housing defining a pump chamber;
• a rotor accommodated in the pump chamber;
• a rotary shaft rotatably supported by the housing, wherein the rotor rotates as the rotary shaft rotates;
• an electric motor that rotates the rotary shaft, the electric motor being accommodated in the housing, the electric motor including a stator and a motor rotor located inside of the stator, the rotary shaft extends through the motor rotor such that the rotary shaft is rotatable relative to the motor rotor, the motor rotor having a first end face and a second end face, the first and second end faces forming end faces of the rotary shaft with respect to an axial direction, and the first end face being exposed to the outside of the stator;
• a hammer portion provided at the first end face, the hammer portion being configured to be movable in a rotating direction of the motor rotor as the motor rotor rotates;
• and
• a collision portion protruding from the rotary shaft such that the collision portion rotates integrally with the rotary shaft, the collision portion being configured to collide with the hammer portion, the collision portion and the hammer portion defining an allowance space between the collision portion and the hammer portion with respect to the rotating direction of the motor rotor, and the allowance space allowing the hammer portion to move relative to the collision portion such that the hammer portion directly collides with the collision portion.