JPS644502U

JPS644502U -

Info

Publication number: JPS644502U
Application number: JP9905187U
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……アンギユラ玉軸受、９……アンギユ
ラ玉軸受、１２……（外輪用）間座、１３……主
軸、２０……油圧シリンダ、２１……ピストン、
２３，２４……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... Angular ball bearing, 9... Angular ball bearing, 12... Spacer (for outer ring), 13... Main shaft, 20... Hydraulic cylinder, 21... Piston,
23, 24... 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 attached to the headstock and has a step in the center, and the step in the bearing housing and a side plate fixed to the front end surface of the bearing housing are used to adjust the preload in the axial direction. a first angular contact ball bearing to which is fixed, a second angular contact ball bearing fitted into the opposite side of the stepped portion of the bearing housing, and outer rings of the second angular contact ball bearing and the first angular contact ball bearing. an elastically deformable spacer which is fitted between the spacer and which has a determined preload load; and a hydraulic cylinder provided at the end of the bearing housing which pressurizes the outer surface of the outer ring of the second angular ball bearing. Preload of a machine tool main shaft bearing, comprising a piston that deforms the spacer, a hydraulic unit that supplies pressure oil to the hydraulic cylinder, and a preload control device that controls the hydraulic unit and adjusts the pressing force of the piston. Adjustment mechanism.