Automobile wiper motor structure and assembly method thereof

The invention discloses an automobile wiper motor structure and an assembly method thereof. The automobile wiper motor structure comprises a permanent magnet brushless direct current motor and a speed reducer, wherein the left end of an armature shaft of the permanent magnet brushless direct current motor is machined into a worm; the middle part of the armature shaft is supported by a rolling bearing; the rolling bearing is restricted by an opening clamping ring, a pair of dish elastic washers and an opening washer; the right end of the armature shaft is supported by a powder metallurgy spherical sliding bearing; and a worm end self-adaptive supporting structure composed of a worm end sliding bearing, a worm end supporting hole, a bonding sizing material and a sealing ring is arranged at the left end of the armature shaft. During assembling, the assembling of the rolling bearing in the middle of the armature shaft and the powder metallurgy spherical sliding bearing at the right end of the armature shaft is fi