JPH02136476U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図と第２図は本考案の夫々別の実施例を示
す断面正面図である。 ３……枢支軸、５……ハブ、６……ヨーク、７
……ロータマグネツト、１２……他端、１３ａ…
…内周面、１５……一端面、１６……第１凹溝、
１８……内部大径部、１９……外部小径部、２０
……第２凹溝、２１……内部小径部、２２……外
部大径部、Ｄ_１，Ｄ_２……内径。 1 and 2 are sectional front views showing different embodiments of the present invention. 3... Pivot shaft, 5... Hub, 6... Yoke, 7
...Rotor magnet, 12...Other end, 13a...
...Inner circumferential surface, 15...One end surface, 16...First concave groove,
18... Internal large diameter part, 19... External small diameter part, 20
...Second groove, 21...Inner small diameter part, 22...Outer large diameter part, _D1 , _D2 ...Inner diameter.

Claims (1)

【実用新案登録請求の範囲】 １ 枢支軸３の廻りに回動自在に枢着されたハブ
５の一端面１５から熱膨張時の変形防止用第１凹
溝１６を形成し、かつ、該ハブ５の他端１２から
挿嵌されるヨーク６の形状をロータマグネツト７
が固着される内部の径よりも上記他端１２の内周
面１３ａに対応する他端寄りの径が小さくなるよ
うに絞り状に形成し、該ヨーク６が内部大径部１
８と外部小径部１９を有する異径管型とし、該外
部小径部１９の外周面と上記ハブ５の他端１２寄
りの内周面１３ａとの間に、熱膨張時の変形防止
用第２凹溝２０を形成したことを特徴とするスピ
ンドルモータ。 ２ 枢支軸３の廻りに回動自在に枢着されたハブ
５の一端面１５から熱膨張時の変形防止用第１凹
溝１６を形成し、かつ、該ハブ５の孔部１３の形
状が、中間部の内径Ｄ_１よりも他端１２の内周面
１３ａの内径Ｄ_２を大きく設定して、外部大径部
２２を有する段付形状を一部に備えた形状とされ
、同一径円筒型のヨーク６を、上記中間部の内径
Ｄ_１の内部小径部２１に嵌着すると共に、該外部
大径部２２との間に熱膨張時の変形防止用第２凹
溝２０を形成したことを特徴とするスピンドルモ
ータ。[Claims for Utility Model Registration] 1. A first concave groove 16 for preventing deformation during thermal expansion is formed in one end surface 15 of a hub 5 rotatably attached around a pivot shaft 3; The shape of the yoke 6 inserted from the other end 12 of the hub 5 is determined by the rotor magnet 7.
The yoke 6 is formed into a constricted shape so that the diameter near the other end corresponding to the inner circumferential surface 13a of the other end 12 is smaller than the diameter of the inside where the yoke 6 is fixed.
8 and an outer small diameter portion 19, and a second pipe is provided between the outer circumferential surface of the outer small diameter portion 19 and the inner circumferential surface 13a near the other end 12 of the hub 5 to prevent deformation during thermal expansion. A spindle motor characterized in that a groove 20 is formed. 2. A first concave groove 16 for preventing deformation during thermal expansion is formed from one end surface 15 of the hub 5 rotatably mounted around the pivot shaft 3, and the shape of the hole 13 of the hub 5 is However, the inner diameter _D2 of the inner circumferential surface 13a of the other end 12 is set larger than the inner diameter _D1 of the intermediate part, so that the shape has a stepped shape having a large outer diameter part 22, and the same diameter A cylindrical yoke 6 was fitted into the inner small diameter part 21 of the intermediate part with an inner diameter _D1 , and a second groove 20 for preventing deformation during thermal expansion was formed between it and the outer large diameter part 22. A spindle motor characterized by: