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Rolling bearing, and spindle device for machine tool

A technology for rolling bearings and machine tool spindles, which is applied in rolling contact bearings, roller bearings, bearings for rotational motion, etc. It can solve problems such as poor transmission efficiency and achieve the effect of preventing seizure

Inactive Publication Date: 2016-07-06
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the recent development of machine tool spindles, the speed has been continuously pursued in order to improve the efficiency. Due to the influence of heat generated by the friction when the gears mesh with each other and the slippage of the belt in the current gear drive and belt drive, Its transmission efficiency is not ideal, so the drive motor is directly coupled by a coupling, or directly installed inside the main shaft, the so-called built-in motor form has become the current mainstream

Method used

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  • Rolling bearing, and spindle device for machine tool
  • Rolling bearing, and spindle device for machine tool
  • Rolling bearing, and spindle device for machine tool

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Embodiment Construction

[0099] Hereinafter, rolling bearings according to various embodiments of the present invention will be described in detail with reference to the drawings.

[0100] (first embodiment)

[0101] figure 1 is a sectional view of a rolling bearing according to a first embodiment of the present invention, figure 2 for figure 1 Oblique view of the middle cage, image 3 for figure 1 A plan view of a part of a rolling bearing, Figure 4 for image 3 The C-C cross-sectional view of Figure 5(a) is a plan view of the roller, and Figure 5(b) is a plan view of the cage.

[0102] As shown in the figure, the rolling bearing 1 according to the first embodiment of the present invention is provided with an outer ring raceway surface 2a on the inner diameter surface of the outer ring 2, and an inner ring raceway surface on the outer diameter surface of the inner ring 3. 3a, between the raceway surface 2a of the outer ring and the raceway surface 3a of the inner ring, a plurality of rollers...

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Abstract

A rolling bearing (1) is provided with an outer ring (2), an inner ring (3), rollers (4) which are provided in a free-rolling manner between the outer ring (2) and the inner ring (3), and a retainer (10) which has pockets (11) formed at predetermined intervals in the circumferential direction and respectively retaining the rollers (4). The retainer (10) is of the outer ring guide type or the inner ring guide type. The retainer (10) has retainer guide surfaces on one axial side and the other axial side, respectively, of each of the rollers (4). If the width of the retainer guide surface on the one axial side is delta L1, the width of the retainer guide surface on the other axial side is delta L2, and the gap of an axial pocket is delta P, the rolling bearing (1) satisfies the expressions of delta P<=delta L1<= 4*delta P and delta P<=delta L2<=4*delta P.

Description

technical field [0001] The present invention relates to rolling bearings and machine tool spindles, or more specifically, to rolling bearings used in high-speed rotary machine tool spindles, high-speed motors, etc., and machine tool spindles using the motors. Background technique [0002] In the recent development of machine tool spindles, the speed has been continuously pursued in order to improve the efficiency. Due to the influence of heat generated by the friction when the gears mesh with each other and the slippage of the belt in the current gear drive and belt drive, The transmission efficiency is not ideal, so the drive motor is directly coupled with a coupling, or directly installed inside the main shaft, so-called built-in motor has become the current mainstream. In the case of these high-speed spindles, the dmn value of the bearings used in the spindle has basically reached more than 500,000 revolutions. In addition, when using a ceramic material (for example, sil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C33/36F16C33/46
CPCF16C33/36F16C33/46F16C33/6614F16C33/4605F16C33/4676F16C2240/46F16C2322/39F16C43/06F16C2240/50F16C19/26F16C19/527F16C33/34
Inventor 水上敦司
Owner NSK LTD
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