Fluid bearing device
AssigneeNtn Corporation
InventorKenji ITO
Life of this patent
Estimating the term…
Abstract
Disclosed is a fluid bearing device in which a high adhesive strength is ensured in fixing another member by adhesion to a resin housing. A bearing sleeve is secured in position inside the resin housing, and a shaft member is radially supported in a non-contact fashion by a dynamic pressure action of lubricant generated in a radial bearing clearance between the shaft member and the bearing sleeve. A metal bracket for mounting the stator coil of a motor is fixed by adhesion to the outer periphery of the housing, in which the adhesion portion of the outer periphery of the housing to be fixed to the bracket is roughened, setting the surface roughness to 0.5 μmRa to 2.0 μmRa.
Claims25
1-7. (canceled)
A method for manufacturing a fluid bearing device, the bearing device including a housing, a bearing sleeve having an inner peripheral surface, a shaft member having an outer peripheral surface, and being arranged to rotate relative to the bearing sleeve, and a radial bearing portion supporting the shaft member radially in a non-contact fashion with an oil film formed in a radial bearing clearance between the inner peripheral surface of the bearing sleeve and the outer peripheral surface of the shaft member, and a second member, said method comprising:
- forming the housing by molding of resin;
- forming the second member of metal;
- securing the bearing sleeve in position inside the housing;
- and
- fixing the second member by adhesion to an adhesion portion of the housing, wherein the adhesion portion of the housing is molded by a roughened molding surface of a mold so that the adhesion portion has a surface roughness of 0.5 μmRa or more and is molded simultaneously with the molding of the housing.
Dependencies are inferred from the claim text.