Abstract: A motor includes a base, a stator and a bearing both mounted to the base, a rotor and a retaining ring. The rotor includes a shaft having an annular groove formed in an outer periphery thereof to form a neck with a first outer diameter. The shaft includes an obstructing portion forming an end edge of the annular groove and having a second outer diameter larger than the first outer diameter. The retaining ring is partially received in the annular groove. The retaining ring includes a combining section for positioning itself and a retaining section delimiting a through hole with a diameter larger and smaller than the first and second outer diameters respectively to form a gap between the through hole and neck. Consequently, noise by friction of the retaining ring against the shaft and departure of the rotor from the base are avoided with unlimited assembly of the motor.

Abstract: A motor/generator for a hybrid transmission includes a bearing support configured for attachment to the hybrid transmission. A stator can is bonded directly to the bearing support, possibly by welding. The motor/generator may further include a stator press-fit into said stator can. A method of assembling a hybrid transmission includes welding a stator can to a bearing support, forming a motor/generator housing. A stator is then pressed into the housing. A substantially-complete motor/generator is assembled by installing a rotor, a rotor hub, and a ball bearing into the housing, which are held in the motor/generator housing with a snap ring. The method may include rigidly attaching the substantially-complete motor/generator to a main case. The method may further include testing the substantially-complete motor/generator prior to transporting the motor/generator to a final place of assembly and rigidly attaching the motor/generator to the transmission main case.

Abstract: A fluid dynamic bearing apparatus with an increased adhesive strength between a component having an adhesion fixing face and a bracket is provided by appropriately controlling the adhesion gap. Materials for a bracket 6 and a housing 7 are selected so that the value obtained by dividing the linear expansion coefficient of the housing 7 fixed to the inner periphery of the bracket 6 by the linear expansion coefficient of the bracket 6 having a portion 6b for mounting a stator coil 4 of a motor is not lower than 0.5 but not higher than 2.0. An adhesion fixing face 7e formed on the outer periphery of the housing 7 is adhesively fixed to the inner circumferential surface 6a of the bracket 6 with an anaerobic adhesive or an epoxy-based adhesive.