JPH0362702U

JPH0362702U -

Info

Publication number: JPH0362702U
Application number: JP12234989U
Authority: JP
Priority date: 1989-10-19
Filing date: 1989-10-19
Publication date: 1991-06-19
Anticipated expiration: 2004-10-19
Also published as: JP2530340Y2

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例の縦断面図である。図中、１……スピンドル軸、２……その貫通孔
、３……工具取付用テーパ穴、４Ｂ……中間アン
ギユラ玉軸受、４Ｃ……後端アンギユラ玉軸受、
７……前軸受ブロツク、１５……第１のサーボモ
ータ、１６……そのロータ、１７……第２のサー
ボモータ、１８……そのロータ、３１……第１ハ
ウジング、３２……中間支持板、３３……第２ハ
ウジング、３４……後蓋、３７……第１のサーボ
モータのステータ、３８……その冷却ジヤケツト
、５７……第２のサーボモータのステータ、５８
……その冷却ジヤケツト。 FIG. 1 is a longitudinal sectional view of an embodiment of the present invention. In the figure, 1...spindle shaft, 2...through hole thereof, 3...tapered hole for tool attachment, 4B...middle angular ball bearing, 4C...rear end angular ball bearing,
7... Front bearing block, 15... First servo motor, 16... Its rotor, 17... Second servo motor, 18... Its rotor, 31... First housing, 32... Intermediate support plate , 33... Second housing, 34... Rear cover, 37... Stator of the first servo motor, 38... Cooling jacket thereof, 57... Stator of the second servo motor, 58
...That cooling jacket.

Claims

[Scope of Claim for Utility Model Registration] (1) In a motor built-in spindle device having a built-in servo motor for directly driving a spindle shaft in a housing, bearings for supporting the spindle shaft are provided at both front and rear ends and at an intermediate portion. At least one end bearing and an intermediate bearing are preloaded with a constant pressure, a first servo motor is provided between the front end and intermediate bearings, and a second servo motor is provided between the intermediate and rear end bearings. A two-motor built-in spindle device, wherein each servo motor has a rotor fixed to an outer surface of a spindle shaft and a stator fixed to an inner surface of the housing in circumferential opposition to the rotor. (2) The housing of the spindle shaft is connected to a first housing in which the first servo motor is built in, and an intermediate support plate disposed at the rear end of the first housing, and the second servo motor is connected to the first housing through an intermediate support plate disposed at the rear end of the first housing. The two-motor built-in spindle device according to claim 1, comprising: a second housing having a built-in motor; and a rear cover disposed at a rear end of the second housing. (3) the spindle shaft is a hollow spindle shaft;
3. The two-motor built-in spindle device according to claim 2, wherein the tip has a tapered hole for attaching a tool, and the first housing and the second housing have a cooling jacket on the outer periphery of the stator of the servo motor.