| 摘要 |
679,090. Machine tool details. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. March 22, 1951 [March 25, 1950], No. 6897/51. Class 83 (iii). [Also in Groups XXIII and XXXIV] A lathe &c. has the main spindle subject in the longitudinal direction to relatively different pressures which tend to urge it against a thrust bearing, one end of the spindle being located in a space in which the pressure is lower than atmosphere, the thrust bearing, preferably being located in this space also. The spindle 1 is supported in a bearing sleeve 2a enclosed in a housing 2. A V-pulley 3 drives the spindle which, in a lathe, carries a work-holder 6 at one end with work 8 acted upon by a tool 9. At the other end of the spindle an adjustable thrust bearing 20 is provided in a space 18 recessed in a cover member 11. The space 18 communicates through a conduit 15 with a space in which a pressure lower than atmospheric is maintained so that the spindle is thus held by the pressure difference at its ends, against the thrust bearing. This pressure difference may also be used to draw lubricant through a conduit 16 and along passageways in the bearing 2a to cool and lubricate the spindle. The spindle is stated to be applicable also to milling and grinding machines. |
