JPH0318654U

JPH0318654U -

Info

Publication number: JPH0318654U
Application number: JP7879989U
Authority: JP
Priority date: 1989-07-04
Filing date: 1989-07-04
Publication date: 1991-02-25

Description

[Brief explanation of drawings]

第１図は本考案に係るモータの軸受装置の一実
施例をブラシレスモータとともに示す縦断面図、
第２図は第１図のロータヨークの要部を示す斜視
図、第３図は従来のモータ軸受装置をブラシレス
モータとともに示す縦断面図である。１……ステータ部材（軸受ケーシング）、３，
５……ボールベアリング、３ａ，５ａ……内輪、
３ｂ，５ｂ……外輪、７……フランジ、９……回
路基板、１１……スペーサ板、１３……磁心コア
、１５……突極歯、１７……駆動コイル、１９…
…ロータ軸、２１……ロータヨーク、２３……ね
じ、２５……側壁、２７……駆動マグネツト、２
９……回転体（チヤツキング円盤）、３３……予
圧部材（予圧ばね）、３５……予圧部材（切起し
片）。 FIG. 1 is a longitudinal sectional view showing an embodiment of a motor bearing device according to the present invention together with a brushless motor;
FIG. 2 is a perspective view showing a main part of the rotor yoke shown in FIG. 1, and FIG. 3 is a longitudinal sectional view showing a conventional motor bearing device together with a brushless motor. 1... Stator member (bearing casing), 3,
5...Ball bearing, 3a, 5a...Inner ring,
3b, 5b... Outer ring, 7... Flange, 9... Circuit board, 11... Spacer plate, 13... Magnetic core, 15... Salient pole tooth, 17... Drive coil, 19...
... Rotor shaft, 21 ... Rotor yoke, 23 ... Screw, 25 ... Side wall, 27 ... Drive magnet, 2
9... Rotating body (chucking disk), 33... Preload member (preload spring), 35... Preload member (cut and raised piece).

Claims

[Claims for Utility Model Registration] At least one ball bearing disposed on the stator side with its outer ring fixed to the stator side; a rotor shaft rotatably supported by the ball bearing; A rotor yoke screwed to one end surface of the rotor shaft protruding from the ball bearing; and a preload member elastically interposed between the inner ring of the ball bearing and the rotor yoke to apply preload to the ball bearing. A bearing device for a motor, characterized in that the preload member is a cut-and-raised piece that is cut and raised from the rotor yoke and whose tip portion presses against the inner ring of the ball bearing.