JPS5846223A - Device for positioning bearing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention is a bearing positioning device (b@arlng 1oea).
The present invention relates to a bearing positioning device fK applicable particularly, but not exclusively, to a bearing positioning device fK for high speed machine tool spindles.

The present invention provides a bearing positioning device having at least one zeta roller bearing between relatively rotating bodies and a hydrostatic bearing effectively arranged between the rolling bearing and one of the bodies. I will provide a.

Typically, hydrostatic bearings have rollers mounted between the bearing and one of the bodies that do not rotate. Preferably, the fluid supply is delivered to separate pockets which are joined by a portion of one of the rotating surfaces. Each pocket may be formed as a flat surface of the inner rotating surface.

The bearing positioning device may have fluid pressure measurement or sensing means coupled to each of the wrinkle fluid supplies to the hydrostatic bearing. Thereby it is possible to calculate the load on the hydrostatic bearing with the difference in pressure between the various supplies. There may also be at least two zeta roller bearings disposed between the two relatively rotating bodies, the roller bearings being loaded in opposite directions by 9' axial forces created by fluid pressure.

Preferably, the fluid pressure exerts an axial force on a piston of the piston-cylinder arrangement, one of the zeta-rolling bearings being supported by the piston or cylinder.

Advantageously, the fluid pressure applied to produce the bearing force of - or more varies with the relative rotational speed of the body. - Preferably there is a means for limiting the angle of rotation across the hydrostatic bearing.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, a spindle 10, which is rotated by suitable external means such as gears, belts, etc., is mounted on two tapered roller bearings 11.12KIl. Spin, $10
Although part of a high speed machine tool, the invention is applicable to many other types of spindles. In fact, in some applications, the spindle 10 is fixed and the other structures of the spindle rotate.

A shoulder 15 etc. is formed at the front end of the sugondol 10 near the collet holder 140.

Bearing 12. The inner race 15 is the spindle 10 and shoulder 1
, 5. The unilateral race 16 is connected to the bore 1 of a fixed structure 119, typically in the form of a headstock.
7 and 18.

The inner race 19 of the rear bearing 11 is connected to the spindle 1.
．． 0 and positioned on the cap 20 in the axial direction, KIl!
It's happening. The cap 20 is secured to the end of the spindle 10 (4°) by screws 21. The outer race 22 of the bearing 11 is positioned by a hole 23 and a shoulder 24 made in the piston 25.

The piston 25 has coaxial cylindrical surfaces 26.2-7, each of which has a corresponding hole 28.2 in a part of the structure 119. It's stuck in. It will be seen that an annular cavity 30 is thereby created, which cavity 30 is connected by a duct 31 to a source of pressurized oil, as shown in the figure. In this way, the pressure of the oil in the annular location 50 creates an axial force that forces the piston 25 of constant size towards the left in FIG. , then cap 20 and spindle 1
The same axial preload is applied to the bearing 12 via 0.

Piston 25 is limited in rotation by a tongue 52 which is secured to structure 119 and which engages a groove or recess 35 made in the end of piston 25.

It is often an essential requirement in high speed spindles that the spindle be accurately positioned axially and mounted in a precise manner radially relative to the large structure it supports. In the case of the present invention KFi, the spindle 10 is
Such precision and difficulty in determining the 0th place can be reduced. This problem is alleviated by providing a positive hydrostatic bearing arrangement between the piston 25 and the surrounding structure 119.

Hydrostatic bearings are formed as bearings between two rotating surfaces where one of the rotating surfaces has multiple fluid supplies spaced circumferentially and each shim being biased by a portion of the rotating surfaces. Such hydrostatic bearings are inherently very difficult;
At the same time, Uke avoids metal-to-metal contact, which can cause irreversible corrosion.

A preferred form of hydrostatic bearing is shown in FIG. 2, in which a piston 250 cylindrical surfaces 26 are circumferentially spaced 6
It is formed by two planes s4, and its plane 1irp surface 2
6 axial lengths - #/CFi, thereby forming six separate pockets. Each pocket 35 receives a supply of pressurized oil through an interconnected duct 36.

Due to the axial and radial hydrostatic loading of the piston 25, the required axial preload and high degree of radial stiffness of the bearings 11, 12 is influenced by the axial and radial elongation k of the various components in use. Despite this, it can be sustained.

The number of pockets 35 is selected depending on the size of the device.

The oil supply #i, n to the ducts 36 may be by any method commonly used in hydrostatic bearings, such as capillary tubes, oleice spouts or flow control valves. Furthermore, the oil pressure in each pocket is monitored and the oil pressure value is
It may be used to determine the radial force acting on 1.

Using hydrostatic bearings increases radial damping, reduces noise transmission in the bearing, and helps compensate for differential radial expansion due to heat generation in the bearing.

Rotating front race 22 and structure 1 of Hydrostatic Bearing Co., Ltd. bearing 11
In some embodiments, the hydrostatic bearing is preferably positioned effectively between the single revolution race 19 of the bearing 11 and the spindle 100.

Although the hydrostatic bearing is shown simply as a radial bearing, in other embodiments it may be used as a hydrostatic thrust bearing or a radial thrust bearing.

In some embodiments, it may be advantageous to increase or decrease the pressure supplied to cavity 30 and/or pocket 35 as the speed of the spindle increases.

[Brief explanation of the drawing]

FIG. 1 is a sectional view taken along line I-1 in FIG. 2 and taken through two intersecting planes passing through the axis of the spindle; FIG. 2 is a longitudinal sectional view taken along line 1-111 in FIG. Patent applicant Tsuneko Kojima, patent attorney representing T.I. Churchill Ltd. Procedural amendment (method/spontaneous) February 7, 1981 Kazuo Wakasugi, Director of the Japan Patent Office 1, Indication of case Patent application @ 57-1368072 Name of the invention Relationship with the case of the person who made the bearing positioning device S amendment Patent applicant TI Churchill Limited 4th generation speaker Contents of the S amendment subject to the S amendment, specification, drawings, and document evidencing the S amendment ■ Engraving of the application, specification, and drawings (no changes to the contents) +
27 Submit a letter of approval, l Attached documents 0 Gin application form 1 Usual details
Book 1 drawing side
1 letter of qualification and translation 1 copy each

Claims (1)

[Scope of Claims] t A bearing positioning device having two bodies capable of relative KB rotation and having at least one roller )' bearing, which is a hydrostatic bearing ( !!4,
55.34) with the hinge bearing (11) and the main body (119).
2) A hydrostatic bearing, a rolling bearing, and a non-rotating scissor body. one. The bearing position umbrella device according to claim 1, characterized in that the intervening member has nine members. (5) A bearing positioning device R74 according to claim 1 or 2, characterized in that each of the fluid supplies is sent to a separate Olket attached by a part of one of the rotating surfaces; Each pocket has an inner rotating surface 0 plane (
34) The bearing positioning device according to claim 3, characterized in that it is formed as: 34).翫 Having a fluid needle side or sensing means connected to each of the fluid □ supplies to the hydrostatic bearing, whereby the difference in pressure between the various supplies makes it possible to calculate the load on the hydrostatic bearing. Claim 1.2. !
The axial steepness positioning device according to Section 4 of Section i. 4 At least two zeta bearings (11, 12)
Claim 1, characterized in that the upper bearing is provided between two relatively rotatable bodies and is loaded in opposite directions by an axial force generated by fluid pressure (51). .2゜5.4 Bearing positioning device of Section 5. 2 the piston (25) so that the fluid pressure produces an axial force;
, and the rollers acting on the piston of the cylinder (Se9) device, one of the bearings (11) is supported by the piston or cylinder.
Bearing positioning device listed in section □. Claim 1.2. characterized in that the pressure of the fluid applied to produce the force on one or more bearings is varied in dependence on the relative speed of rotation of the bodies.
! ! , 4,5° The bearing positioning device according to item 6 or 7. 9. The bearing positioning device according to claim 8, wherein the pressure of the fluid is increased as the speed increases. 1a Bearing positioning device according to any one of the preceding claims, characterized in that one of the bodies (119) is not rotatable and the other body is a spindle (10). 11. The bearing positioning device according to claim 10, wherein the spindle is a high-speed machine tool spindle. 1z Bearing positioning device according to any one of the preceding claims, characterized in that the device has means (52, 5! 5) for limiting the angle of rotation across the hydrostatic bearing.