The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 10, 1998
Filed:
Nov. 22, 1996
Yasuo Niino, Aichi-ken, JP;
Toshihiko Shima, Okazaki, JP;
Toyoda Koki Kabushiki Kaisha, Kariya, JP;
Abstract
A machining spindle apparatus has a hydrostatic bearing for machine tools. The machining spindle apparatus includes a built-in motor built into the middle of a housing, as well as front and rear hydrostatic bearings respectively mounted on the front side and the rear side of the housing. A machining spindle is driven by the built-in motor and rotatably supported by the front and rear hydrostatic bearings. The front hydrostatic bearing comprises a radial bearing pocket and a thrust bearing pocket. In addition, a pair of pneumatic seals lie over the radial and thrust bearing pockets. The rear hydrostatic bearing includes a radial bearing pocket and a constant-pressurized oil chamber. The constant-pressurized oil chamber operates as a piston cylinder. Accordingly, a predetermined pressure acts forward, i.e. opposite the thrust bearing pocket of the front hydrostatic bearing. And another pair of pneumatic seals lies over both of the radial bearing pocket and the constant-pressurized oil chamber.