JPS644503U

JPS644503U -

Info

Publication number: JPS644503U
Application number: JP9905287U
Authority: JP
Priority date: 1987-06-26
Filing date: 1987-06-26
Publication date: 1989-01-12

Description

[Brief explanation of the drawing]

第１図は主軸ユニツトの軸受部の上半分を切断
して表した本考案の説明図である。１……主軸台、２……軸受ハウジング、３……
側板、８……前側アンギユラ玉軸受、９……後側
アンギユラ玉軸受、１０……ばね、１２……外輪
用間座、１３……主軸、１９……ピストン、２１
，２２……温度センサ、２７……予圧コントロー
ル装置、２８……油圧ユニツト。 FIG. 1 is an explanatory view of the present invention, with the upper half of the bearing portion of the spindle unit cut away. 1... Headstock, 2... Bearing housing, 3...
Side plate, 8... Front angular ball bearing, 9... Rear angular ball bearing, 10... Spring, 12... Outer ring spacer, 13... Main shaft, 19... Piston, 21
, 22... Temperature sensor, 27... Preload control device, 28... Hydraulic unit.

Claims

[Scope of utility model registration request]

In a preload adjustment mechanism for an angular ball bearing for the main spindle of a machine tool, the bearing housing is fitted into the headstock and has a stepped portion in the center, and the stepped portion of the bearing housing and a side plate fixed to the end surface of the bearing housing are used to adjust the axial direction. a first angular contact ball bearing to which is fixed, a second angular contact ball bearing fitted on the opposite side of the bearing housing, and an outer ring between the second angular contact ball bearing and the first angular contact ball bearing. A spacer is inserted between the spacer and the spacer, which is divided into a front cylinder and a rear cylinder and biased by a spring so as to have a minute gap between the front cylinder and the rear cylinder, and a spacer which is fitted in an oil-tight manner on the outer periphery of the spacer and is operated by pressure oil. It includes a piston that axially pressurizes the inner end surface of the outer ring of the second angular ball bearing, a hydraulic unit that supplies the pressure oil, and a preload control device that controls the hydraulic unit and adjusts the pressing force of the piston. A preload adjustment mechanism for machine tool spindle bearings.