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Spindle device

A technology for spindle devices and bearings, applied in shafts, bearings, shafts and bearings, etc., can solve problems such as maintaining waterproof performance, excessive heat in contact parts, and wear of sealing parts

Active Publication Date: 2013-09-04
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this contact seal is applied to a spindle device used for high-speed rotation with a dmn value of a bearing arranged on the main shaft of 1 million or more (more preferably 1.5 million or more), the contact portion where the contact seal exists A lot of heat is generated, and the sealing parts are worn, making it difficult to maintain waterproof performance for a long time

Method used

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Experimental program
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Effect test

no. 1 approach ）

[0252] Such as figure 1 with figure 2 As shown, the spindle device 10 of the present embodiment is a built-in motor spindle device for machine tools. The two rows of front bearings 50, 50 on the tool side (front side) supporting the rotating shaft 11 are opposite to those on the tool side supporting the rotating shaft 11. The two rows of rear bearings 60 and 60 on the side (rear side) support the rotating shaft 11 in the housing H in a rotatable manner. The housing H has a front bearing outer ring fastening portion 12, an outer cylinder 13, and a rear housing 14 in this order from the tool side.

[0253] Each front side bearing 50 is an angular contact ball bearing. Each angular contact ball bearing includes an outer ring 51, an inner ring 52, balls 53 as rolling elements arranged with contact angles, and a cage not shown. Each rear side bearing 60 It is an angular contact ball bearing that includes an outer ring 61, an inner ring 62, balls 63 as rolling elements, and a cage no...

Deformed example 1

[0274] The slinger 40 is not limited to a carbon fiber composite material, and may be formed of a material having a specific modulus greater than that of the rotating shaft 11. Here, the specific modulus is the value obtained by dividing the longitudinal elastic modulus by the density (specific elastic modulus = E (longitudinal elastic modulus: kgf / m 2 ) / Ρ(Density: kg / m 3 )).

[0275] For example, when the rotating shaft 11 is formed of metal such as SC material, SCM material, SUS material, AL material, or CU material, the specific modulus is 1.4×10 6 m~2.7×10 6 m, and the slinger 40 is formed of a material having a larger specific modulus. The specific modulus of the slinger 40 is larger than the specific modulus of the rotating shaft 11, preferably 5×10 6 m or more, more preferably 8×10 6 m above. On the other hand, considering the imbalance of stress with the embedded rotating shaft 11, the upper limit is preferably 20×10 in practical applications. 6 m or less. In addition, t...

no. 2 approach ）

[0287] Next, refer to image 3 The second embodiment of the spindle device will be described. image 3 It is a cross-sectional view of the main part of the spindle device according to the second embodiment of the present invention, and the structure of the slinger is different from the first embodiment. As for the other parts, they are the same as the spindle device of the first embodiment of the present invention, so the same or equivalent symbols are assigned to the same parts, and the description thereof is simplified or omitted.

[0288] The annular portion 43 of the slinger 40A of the spindle device 10 of the present embodiment includes: an outer peripheral annular portion 43a including the outer peripheral surface of the annular portion 43, and an inner diameter side located on the inner diameter side of the outer annular portion 43a 圆环部43b. The outer diameter side annular portion 43a and the inner diameter side annular portion 43b are formed of different materials, the oute...

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Abstract

Provided is a spindle device having a good waterproof function. At least part of a rotary member (40) which is integrally rotatably affixed to a rotary shaft (11) of a spindle device (10) and constitutes part of a waterproof mechanism for preventing ingress of liquid into front-side bearings (50, 50) is formed from a carbon fiber composite material.

Description

Technical field [0001] The present invention relates to a spindle device, and more specifically to a spindle device with waterproof function and suitable for machine tools. Background technique [0002] The rotating shaft of a spindle device used in a machine tool rotates at a high speed to perform cutting or grinding of a workpiece. When processing, generally speaking, for the purpose of lubricating or cooling the tool and the processed part, a large amount of machining fluid is supplied to the processed part. That is, through lubrication, the improvement of cutting performance, the suppression of machining bit wear, and the extension of tool life are realized. In addition, cooling is used to suppress the thermal expansion of the tool and the workpiece, thereby achieving an improvement in processing accuracy; preventing thermal welding of the processed part, thereby achieving an improvement in processing efficiency; and improving the surface performance of the processed surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B19/02F16C33/80
CPCB23Q1/70F16C33/80F16C2206/06F16C2322/39B23Q11/0883F16J15/164F16J15/4476F16C19/546
Inventor 稻垣好史岩崎修小栗翔一郎米山博树胜野美昭
Owner NSK LTD
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