SPINDLE MOTOR AND HARD DISC DRIVE DEVICE

• Main Authors: NAKASHIMA DAIGO, SHOWA HIDEAKI
• Format: Patent
• Language: English; Japanese
• Published: 29.09.2023
• Subjects: BEARINGS; BLASTING; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERATION; HEATING; LIGHTING; MECHANICAL ENGINEERING; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; THERMAL INSULATION IN GENERAL; WEAPONS

To provide a spindle motor that does not require a sleeve case covering a bearing sleeve, while maintaining wear resistance between a shaft and the bearing sleeve.SOLUTION: A spindle motor 3 includes: a shaft 60 that has a columnar shaft portion 61 extending in an axial direction and having a shaft end portion 64, and a flange portion 62 provided at the shaft end portion 64 to receive a load in the axial direction; and a cylindrical bearing sleeve 40 that rotatably supports the shaft 60 and has a sleeve end portion 41 formed with a large-diameter recessed portion 42 in the axial direction. The shaft 60 is formed by a copper alloy containing silicon of not less than 0.5 wt% to not more than 1.5 wt% and manganese of not less than 0.5 wt% to not more than 3.0 wt%, and is a member where a shaft 61 and a flange portion 62 are integrated.SELECTED DRAWING: Figure 2 【課題】シャフトと軸受スリーブとの間の耐摩耗性を維持しつつ、軸受スリーブを覆うスリーブケースが不要なスピンドルモータを提供する。【解決手段】スピンドルモータ３は、軸方向に延びて軸端部６４を有する柱状の軸部６１と、軸端部６４に設けられ軸方向の荷重を受けるフランジ部６２と、を有するシャフト６０と、シャフト６０を回転可能に支持する軸受スリーブ４０であって、軸方向において、大径凹部４２が形成されたスリーブ端部４１を有する筒状の軸受スリーブ４０と、を備え、シャフト６０は、０．５質量パーセント以上１．５質量パーセント以下のケイ素と、０．５質量パーセント以上３．０質量パーセント以下のマンガンを含有する銅合金で形成され、軸部６１とフランジ部６２とが一体となった部材である。【選択図】図２