JPH0271112U

JPH0271112U -

Info

Publication number: JPH0271112U
Application number: JP15075688U
Authority: JP
Priority date: 1988-11-21
Filing date: 1988-11-21
Publication date: 1990-05-30

Description

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

第１図は本考案に係る気体軸受装置の一実施例
を示す断面図、第２図及び第３図は夫々補助軸受
としての転がり軸受及び軸受を示す図で、夫々ａ
は平面図、ｂは正面図、第４図は同上実施例の補
助軸受の制御構造を示す概略図、第５図は従来の
気体軸受装置の一例を示す概略図である。３……回転軸、６，７……気体ラジアル軸受、
８……気体スラスト軸受、１１……補助軸受、１
２……アクチユエータ、１３……転がり軸受、１
４……軸受、２０……回転数センサ、２１……コ
ントロールユニツト、２２……三方電磁弁。 FIG. 1 is a sectional view showing an embodiment of the gas bearing device according to the present invention, and FIGS. 2 and 3 are views showing a rolling bearing and a bearing as auxiliary bearings, respectively.
is a plan view, b is a front view, FIG. 4 is a schematic diagram showing the control structure of the auxiliary bearing of the same embodiment, and FIG. 5 is a schematic diagram showing an example of a conventional gas bearing device. 3... Rotating shaft, 6, 7... Gas radial bearing,
8... Gas thrust bearing, 11... Auxiliary bearing, 1
2...actuator, 13...rolling bearing, 1
4... Bearing, 20... Rotation speed sensor, 21... Control unit, 22... Three-way solenoid valve.

Claims

【実用新案登録請求の範囲】[Scope of utility model registration request]

回転軸と軸受との間に隙間を有し、該回転軸を
軸受に対して前記隙間における空気膜を介して非
接触状態で回転支持可能な気体軸受装置において
、前記回転軸の略下半外周面に接触して該軸のラ
ジアル荷重を支持する補助軸受と、該補助軸受を
前記回転軸に接触させる上動位置と非接触にする
下動位置とに移動するアクチユエータと、回転軸
の回転数を検出する回転数検出手段と、該手段か
ら出力される回転数検出信号に基づいて前記アク
チユエータの作動を制御する制御手段と、を設け
たことを特徴とする気体軸受装置。 In a gas bearing device having a gap between a rotating shaft and a bearing and capable of rotationally supporting the rotating shaft in a non-contact state with respect to the bearing via an air film in the gap, substantially the lower half outer periphery of the rotating shaft. an auxiliary bearing that supports the radial load of the shaft by contacting a surface; an actuator that moves the auxiliary bearing between an upward movement position in which the auxiliary bearing is in contact with the rotating shaft and a downward movement position in which it is in non-contact; A gas bearing device comprising: rotation speed detection means for detecting rotation speed detection means; and control means for controlling operation of the actuator based on a rotation speed detection signal output from the means.