Electric motor with sealing structure resisting the entry of sand and dust

摘要

An electrical motor includes a case having a shaft hole formed therein through which a driven shaft of the motor projects. The case includes an exteriorly disposed cylindrical flange surrounding the shaft hole at a radial distance therefrom. Disposed in a cylindrical recess formed by the flange is a first sealing member which has a sealing hole extending therethrough. The shaft extends through the sealing hole, with the shaft rotatably supported by the sealing hole so that the passage of sand and dust through the sealing hole is essentially blocked. A fixing member is secured by interference fit within the recess to retain the first sealing member in place. A second sealing member secured to an outer surface of the flange by an interference fit includes a wall extending across an outer end of the recess to resist the entry of sand and dust into the recess. The shaft extends through through-holes formed in the fixing member and the wall of the second sealing member.