US Patent 10516315 Drive device and ventilation member

A drive device includes: a rotor and a stator; a case housing the rotor and the stator; a brake rotor that is arranged on the outside of the case and rotates in conjunction with the rotation of the rotor; a brake caliper that stops the rotation of the brake rotor by coming in contact with the brake rotor; and a ventilation membrane that is attached to the case, stops fluid or solids from penetrating inside the case from outside the case and also has formed therein multiple pores that permit gas to flow between inside and outside. The case has an output part that supports the rotor and a stator holding part that supports the stator. The ventilation membrane is attached to the stator holding part.