BEARING STRUCTURE AND METHOD

PROBLEM TO BE SOLVED: To provide a bearing structure free from shaft runout with respect to change with time.SOLUTION: The bearing structure is provided that bears a shaft body (9) disposed in a casing (5) by balls (40) positioned in recessed portions (24) of the casing (5) and a pair of first and second ring-shaped bearing members (30, 31). The bearing structure comprises a first groove (35) formed in inner face (30a) of the first ring-shaped bearing member (30), a second groove (37) formed in an inner face (30a) of the second ring-shaped bearing member (31), a tapered face (36) disposed in the second groove (37), a cover body (33) energizing the second ring-shaped bearing member (31) through a wave washer (32), and a first screw portion (38) disposed in an outer periphery of the cover body (33), and engaged with a second screw portion (39) of the recessed portion (24). In the bearing structure and method, each ball (40) is kept in an energized state with respect to the shaft body (9) by the tapered face (36), by screwing the cover body (33) into a ball (40) side.SELECTED DRAWING: Figure 2 【課題】経年変化に対して軸振れのない軸受構造を得ることである。【解決手段】ケーシング(5)内に設けられた軸体(9)を、ケーシング(5)の凹部(24)内に位置するボール(40)と一対の第１、第２輪状軸受部材(30,31)によって軸受けするための軸受構造において、第１輪状軸受部材(30)の内面(30a)に設けられた第１溝(35)と、第２輪状軸受部材(31)の内面(30a)に設けられた第２溝(37)と、第２溝(37)に設けられたテーパ面(36)と、第２輪状軸受部材(31)をウェーブワッシャ(32)を介して付勢とする蓋体(33)と、蓋体(33)の外周に設けられ前記凹部(24)の第２ねじ部(39)と螺合をなす第１ねじ部(38)とを備え、蓋体(33)を前記ボール(40)側に螺入とすることにより、各ボール(40)が前記テーパ面(36)によって軸体(9)に対して付勢状態となる軸受構造と方法である。【選択図】図２