Patent ID: 6489699
Filing Date: 2002-12-03
Classification: F16C,H02K

Abstract:
A motor comprising:a stator body having a stator core, a rotor having a rotor member disposed inside and opposite to said stator core and a shaft on which said rotor member is fixed, a first and a second end brackets fixed at the end portions in the axial direction of said stator body, said first and a second end brackets having a bearing holder portion respectively, a first and a second ball bearings having an inner ring and an outer ring respectively, said inner rings being forcedly set onto the shaft and said outer rings being joined with corresponding said bearing holder portions of said end brackets with adhesive, said bearing holder portion of said first end bracket being so constructed that said first ball bearing is prevented from moving mechanically in said axial direction with respect to said first end bracket, said bearing holder portion of said second end bracket being formed with a bearing fitting space into which said outer ring of said second ball bearing is fitted and a pressure giving structure receiving space which is formed continuously to said bearing fitting space for receiving a pressure giving structure to give pressure in the direction toward said first end bracket to said outer ring of said second ball bearing, said pressure giving structure comprising a spring member, and said second end bracket being provided with a stopper which allows said outer ring of said second ball bearing to move in a spring-compressing direction to compress said spring member before said adhesive cures, but prevents said outer ring of said second ball bearing from moving in the spring-compressing direction to compress said spring member after said adhesive has cured.