JPS5933021U

JPS5933021U - rotating unit

Info

Publication number: JPS5933021U
Application number: JP12614882U
Authority: JP
Inventors: 克彦田中; 佐藤　高信; 修一石川; 宏石橋
Original assignee: 日本精工株式会社
Priority date: 1982-08-23
Filing date: 1982-08-23
Publication date: 1984-02-29

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来の回転ユニットの断面図、第２図はこの考
案の一実施例を示す回転ユニットの断面図、第３図はこ
の考案のブレーキ機構の電気回路図である。図中、２１はハウジング、２４は固定軸、２５はスリー
ブ、３１はスラスト端面、３２はスラスト軸受面、３８
は動圧発生用のみぞ、４７はロータ、４８はステータ、
５１は回転駆動機構、Ｒ９Ｔは電源である。FIG. 1 is a sectional view of a conventional rotating unit, FIG. 2 is a sectional view of a rotating unit showing an embodiment of this invention, and FIG. 3 is an electric circuit diagram of a brake mechanism of this invention. In the figure, 21 is a housing, 24 is a fixed shaft, 25 is a sleeve, 31 is a thrust end surface, 32 is a thrust bearing surface, and 38
is a groove for generating dynamic pressure, 47 is a rotor, 48 is a stator,
51 is a rotational drive mechanism, and R9T is a power source.

Claims

[Scope of utility model registration request]

(1) Fixing one end of the fixed shaft 24 to the housing 21,
A sleeve 25 is fitted and disposed on the fixed shaft 24, so that a thrust end surface 31 provided at the other end of the fixed shaft 24 faces a thrust bearing surface 32 provided on the sleeve 25, and the outer surface of the fixed shaft 24 A groove 38 for generating dynamic pressure is provided in at least one of the radial surface and the inner radial surface of the sleeve 25, and a rotor 47 fixed to the sleeve 25 and a stator 48 fixed to the housing 21 are electrically driven to rotate the sleeve 25.
A rotating unit comprising: a rotating unit comprising a brake mechanism that is activated to stop the sleeve 25 when the rotational drive mechanism 51 is disconnected from the power sources R and T.

(2) At least one of the thrust end surface 31 and the thrust bearing surface 32 has a communication hole 36 that communicates with the outside world, and the thrust bearing surface 32 communicates with the annular contact surface 37 that contacts the thrust end surface 31 when the sleeve 25 is stopped. The rotating unit according to claim 1, which is provided around the hole 36.