Ball bearing

Abstract

A ball bearing that reduces the guard ring sound, achieves low vibration, reduces micro-vibration wear damage, achieves low torque and improves sound durability. Comprising the inner perimeter having an outer ring orbit, the inner ring of the outer perimeter has an inner ring orbit, a plurality of balls freely rolling between the outer ring orbit and the inner ring orbit and a retainer that maintains a plurality of balls and makes it roll freely, the space between the outer ring orbit and the inner ring rail is encapsulated with grease, the grease is a base oil with a polar base oil and a non-polar lubricating oil in a mixed molecular structure with a lubricating oil containing a long fiber length of at least 3 μm metal soap thickener composition; The inner periphery of the cavity of the retainer is composed of a ball face and a curved face, wherein the ball face is composed of a ball concave surface with a curvature radius slightly greater than the radius of curvature of the ball, the curved face having a radius of curvature greater than the ball face and a smooth connection from the end edge of the ball face to the open side end edge of each cavity.

Description

technical field [0001] The present invention relates to ball bearings for various types of motors used in general industries, and more particularly to ball bearings intended to reduce retainer noise, reduce vibration, improve fretting wear (abrasion), achieve low torque, and improve noise durability. Background technique [0002] For general industrial use, for example, an air-conditioning device (hereinafter referred to as "air conditioner") driving motor device is mentioned. In recent years, with the development of high performance and multi-functionality of this air conditioner, the following technology has been developed, that is, using, for example, frequency conversion control, through high-speed operation to quickly cool down the indoor temperature in a short time, and then to lower the room temperature by low-speed operation. Maintain a certain amount. For this reason, low-noise operation that can suppress the exhaust sound of the air and the rotation sound of the m...

AI Technical Summary

Problems solved by technology

On the opposite side of the retainer 6 in the circumferential direction, a portion of the rolling surface of the ball 5 that is close to the inner diameter of the retainer 6 and a portion of the spherical portion 15 that constitutes the inner peripheral surface of the cavity 7 that is close to the inner diameter of the retainer 6 occur in sliding contact. Phenomenon, poor lubricant uptake still occurs

[0018] As a result of such poor lubricant intake, the friction coefficient of the sliding joint between the rolling surface of each ball 5 and the spherical portion 15 constituting the inner peripheral surface of the cavity 7 of the retainer 6 increases.

As a result, there will be problems such as fluctuation or increase of the frictional torque of the ball bearing assembled with the retainer 6, frictional noise during operation, or obvious frictional noise under certain circumstances.

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