Hydrostatic pressure guide mechanism and machine tool

Patent metadata

Field	Value
Publication number	US-9803686-B2
Application number	US-201514924347-A
Country	US
Kind code	B2
Filing date	Oct 27, 2015
Priority date	Oct 28, 2014
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A hydrostatic pressure guide mechanism includes: a guide member having a smooth guide surface; a movement member having a slide surface facing the guide surface and an annular placement groove formed on the slide surface; an annular seal member (hermetically closing member) that is disposed in the placement groove and capable of hermetically contacting with the guide surface; an oil supply structure configured to supply an oil into a static pressure pocket on the slide surface surrounded by the seal member; and an oil recovery structure configured to recover the oil from the static pressure pocket, in which the oil recovery structure has a recovery hole that is formed in the static pressure pocket and is opened on the slide surface.

First claim

What is claimed is:

1. A hydrostatic pressure guide mechanism comprising:
a guide member having a smooth guide surface;
a movement member having a slide surface facing the guide surface and an annular placement groove formed on the slide surface;
an annular hermetically-closing member that is disposed in the placement groove and forms hermetic contact with the guide surface when the movement member and the guide member are disposed to face each other to define a space hermetically sealed by the slide surface, the guide surface, and the hermetically-closing member;
an oil supply structure configured to supply oil into a region on the slide surface surrounded by the hermetically closing member; and
an oil recovery structure configured to recover the oil from the region on the slide surface surrounded by the hermetically closing member, wherein
the oil recovery structure comprises a recovery hole that is formed in the region on the slide surface surrounded by the hermetically closing member, the recovery hole being opened on the slide surface;
the slide surface of the movement member comprises a pressure holding surface surrounding the recovery hole, and a flank surface surrounding the pressure holding surface; and
a height of the pressure holding surface is higher than a height of the flank surface such that the pressure holding surface is positioned closer to the guide member than the flank surface is positioned relative to the guide member when the movement member is placed to face the guide member.

2. The hydrostatic pressure guide mechanism according to claim 1 , further comprising:
a hydraulic control valve configured to adjust a pressure or a flow rate of the oil to be supplied into the region on the slide surface surrounded by the hermetically closing member so as to adjust a pressure applied to the guide surface of the oil to be supplied to the region on the slide surface surrounded by the hermetically closing member.

3. The hydrostatic pressure guide mechanism according to claim 1 , wherein
the oil supply structure comprises an annular oil supply groove surrounding the recovery hole.

4. A machine tool comprising: a guide mechanism provided with plural ones of the hydrostatic pressure guide mechanisms according to claim 1 .

5. The machine tool according to claim 4 , wherein
the oil supply structure and the oil recovery structure are used in common in the plural ones of the hydrostatic pressure guide mechanisms.

6. The machine tool according to claim 5 , wherein
the oil supply structure comprises a hydraulic control valve for each of the plural ones of the hydrostatic pressure guide mechanisms.

7. The machine tool according to claim 5 , wherein
the oil supply structure comprises a hydraulic control valve for each of systems comprising the plural ones of the hydrostatic pressure guide mechanisms.

Assignees

• Toshiba Machine Co Ltd
• Yg Newly Laboratory

Inventors

• Tada Atsushi
• Sagara Makoto
• Tsukiji Teruaki
• Arai Takao

Classifications

• B23Q1/38 Primary

  using fluid bearings or fluid cushion supports · CPC title

• F16C2322/39

  General buildup of machine tools, e.g. spindles, slides, actuators · CPC title

• F16C29/025 Primary

  Hydrostatic or aerostatic (this type of bearing for rotary parts F16C32/06) · CPC title