Patent ID: 8513846

Claim:
A motor comprising: a casing lid made of resin, said casing lid having a plurality of fixation portions along an outer circumference thereof, each of said fixation portions including a groove defining spaced apart contact regions and a noncontact region between the contact regions; and a motor casing made of metal, the motor casing comprising a motor casing wall defining an opening portion with bend portions formed at the opening portion, the bend portions including spaced apart contact regions that bite into the spaced apart contact regions of the respective fixation portions of the casing lid and the bend portions including noncontact regions which do not come into contact with the casing lid, the bend portions biting into the spaced apart contact regions to fix the motor casing and the casing lid together and force resin displaced from spaced apart contact regions into the respective noncontact region, wherein the contact regions are on each side of the groove and the noncontact region is at least in a portion of a surface of the groove and the contact regions are defined by the groove based on a change in surface elevation between the surface of the groove and surfaces of the contact regions, wherein the groove has a surface elevation that varies from an elevation adjacent to contact regions to a surface elevation of a central groove region wherein said elevation adjacent to contact regions is closer to a surface elevation of the contact regions than the surface elevation of the central groove region.