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Rolling bearing and method for manufacturing the same

A rolling bearing and coating technology, applied in the field of rolling bearings and its manufacturing, can solve the problems of high cost and poor insulation, achieve high insulation performance, high corrosion resistance and chemical resistance, and reduce manufacturing costs

Inactive Publication Date: 2012-12-26
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem of very high cost when using these sealing treatment methods
[0012] In addition, even if α-alumina is used in the raw material powder for the ceramic layer obtained by spraying to obtain insulation, it will be transformed into γ-alumina with poor insulation due to the high temperature of the spraying process.
Therefore, this method must increase the film thickness to ensure insulation, which is costly

Method used

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  • Rolling bearing and method for manufacturing the same
  • Rolling bearing and method for manufacturing the same
  • Rolling bearing and method for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] make figure 1 The shown insulated rolling bearing was used as a test bearing (NU214, outer ring outer diameter: Φ125 mm, outer ring width: 24 mm). Here, on the outer peripheral surface 2a of the outer ring 2, the coating 7 made of alumina fine particles is formed by the AD method. The AD method uses a bearing drive unit that uses both an XY stage for positioning and a motor for rotating an object. The outer peripheral surface of the outer ring that rotates at a peripheral speed of 6mm / min while moving in the axial direction is under a reduced pressure of 100Pa or less. , by spraying an aerosol of alumina particles through a nozzle with an opening size of 5 mm×0.3 mm to form a coating. The film formation was performed until the film thickness became 4 μm.

[0071] The alumina fine particles were Taimicron TM-DAR manufactured by Taimyung Chemical Industry Co., Ltd., with an average particle diameter of 0.16 μm, and were used by heating and drying under a reduced pressur...

Embodiment 2

[0074] make figure 2 The shown insulated rolling bearings were used as test bearings. Here, the coating 7 made of alumina fine particles is formed on the inner peripheral surface 1a of the inner ring 1 by the AD method. The AD method uses a bearing drive unit that uses both an XY stage for positioning and a motor for rotating an object, and depressurizes at 100 Pa or less on the inner peripheral surface of the inner ring that rotates at a peripheral speed of 6 mm / min while moving in the axial direction. Next, an aerosol of alumina fine particles was sprayed through a nozzle with an opening size of 5 mm×0.3 mm to form a coating. The film formation was performed until the film thickness became 4 μm.

[0075] Alumina fine particles used the same product as in Example 1. It was confirmed that the obtained test bearings obtained a predetermined insulation resistance (at least 10MΩ / 500V load) between the inner peripheral surface of the outer ring and the outer peripheral surface...

Embodiment 3

[0077] make image 3 The shown insulated rolling bearings were used as test bearings. Here, the coating 7 made of alumina fine particles is formed on the outer peripheral surface 2 a of the outer ring 2 and the inner peripheral surface 1 a of the inner ring 1 by the AD method. The AD method uses a bearing drive unit that uses both an XY stage for positioning and a motor for rotating an object. The outer peripheral surface of the outer ring that rotates at a peripheral speed of 6mm / min while moving in the axial direction is under a reduced pressure of 100Pa or less. , by spraying an aerosol of alumina particles through a nozzle with an opening size of 5 mm×0.3 mm to form a coating. The film formation was performed until the film thickness became 4 μm. Similarly, the coating is also formed on the inner peripheral surface of the inner ring.

[0078] Alumina fine particles used the same product as in Example 1. It was confirmed that the obtained test bearings obtained a predet...

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Abstract

This invention provides a rolling bearing comprising a dense ceramic layer formed by a method alternative to a thermal spraying method, and having excellent insulating properties and corrosion resistance and chemical resistance, for example, resistance to chemicals such as acids and alkalis. The rolling bearing comprises an inner ring (1), an outer ring (2), and a plurality of rolling elements (4) interposed between raceway faces of the inner and outer rings. A ceramic film (7) is provided on at least one peripheral face selected from the inner peripheral face of the inner ring (1) and the outer peripheral face of the outer ring (2). The ceramic film is a film formed by an aerosol deposition method utilizing, for example, alumina fine particles as a raw material for aerosol. The film may be formed, for example, by fixing an aerosol ejection nozzle and axially moving the outer ring or inner ring using a positioning XY table while being rotated by an object rotation motor.

Description

technical field [0001] The present invention relates to a rolling bearing with a ceramic coating, and in particular to a rolling bearing excellent in insulation performance, corrosion resistance to chemicals such as acids and alkalis, and a method for producing the same. Background technique [0002] Rolling bearings used for the main motor of railway vehicles. In the case of incomplete grounding collectors for the current of the main motor from the wheels to the track grounding, the current of the main motor passes through the inner and outer rings of the rolling bearing and rolling elements between the wheels and the track. flow. At this time, discharge occurs between the rolling elements of the bearing and the rolling surface of the outer ring or between the rolling surfaces of the inner ring, and electrolytic corrosion may occur in the discharged part. [0003] As an effective means for preventing such galvanic corrosion, it has been known to form a spray coating of an ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C33/62F16C33/64
Inventor 中岛达雄大平晃也
Owner NTN CORP
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