发明名称 FLUID DYNAMIC BEARING APPARATUS AND MOTOR COMPRISING THE SAME
摘要 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 and a housing are selected so that the value obtained by dividing the linear expansion coefficient of the housing fixed to the inner periphery of the bracket by the linear expansion coefficient of the bracket having a portion for mounting a stator coil of a motor is not lower than 0.5 but not higher than 2.0. An adhesion fixing face formed on the outer periphery of the housing is adhesively fixed to the inner circumferential surface of the bracket with an anaerobic adhesive or an epoxy-based adhesive.
申请公布号 US2015007937(A1) 申请公布日期 2015.01.08
申请号 US201414495538 申请日期 2014.09.24
申请人 Murakami Kazutoyo;Egami Masaki 发明人 Murakami Kazutoyo;Egami Masaki
分类号 B32B37/14;B32B37/12 主分类号 B32B37/14
代理机构 代理人
主权项 1. A method for producing a fluid dynamic bearing apparatus comprising a shaft member, a bracket, and a radial bearing portion which rotatably supports the shaft member in the radial direction by a fluid film formed in a radial bearing gap, and an adhesion fixing face which is adhesively fixed to the inner circumferential surface of the bracket, the method comprising the steps of: forming a component having the adhesion fixing face and the bracket from materials having different linear expansion coefficients so that a value, obtained by dividing a linear expansion coefficient of the housing by a linear expansion coefficient of the bracket, is not lower than 0.5 but not higher than 2.0, defining an adhesion gap between the adhesion fixing face and the inner circumferential surface of the bracket by providing the component having the adhesion fixing face on an inner periphery of the bracket, filling the adhesion gap with an adhesive which is cured with heating, and fixing the component having the adhesion fixing face on the inner periphery of the bracket by curing the adhesive.
地址 Kuwana-shi JP