Retainer for rolling bearing, and rolling bearing

Abstract

The invention provides a retainer for a rolling bearing, containing an increased amount of a lubricating oil and enhancing a use efficiency of the lubricating oil, and a rolling bearing. The retainer for a rolling bearing of the invention consists of a molding, of a synthetic resin composition, which holds a rolling element of a rolling bearing. he formed body is made by impregnating lubrication oil into a resin porous body having a communication hole ratio of not less than 30%.

Description

technical field [0001] The present invention relates to a cage for a rolling bearing and a rolling bearing using the cage, and more particularly to a cage using a resin porous body having communicating holes, a rolling bearing for a vacuum machine, and a rolling bearing for a food machine using the cage. Background technique [0002] The previous cages for rolling bearings are composed of metal, polyamide resin, polyacetal resin, polybutylene terephthalate resin, etc. Especially when synthetic resin is used, injection moldable synthetic resin monomers can be used, or A synthetic resin composition reinforced by adding glass fiber, carbon fiber, organic fiber, etc. to a synthetic resin molding material. For the lubrication of a rolling bearing having such a cage, a semisolid lubricant such as lubricating oil or grease is generally used. [0003] However, if a large amount of semi-solid lubricant such as grease is used, the torque for rotating the rotating shaft supported by ...

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Problems solved by technology

There is also a problem that resin materials that can be compression-molded with communicating holes are limited, which in turn limits the resins that can be used

[0007] In addition, the cage formed by the oil-containing plastic composed of the oil-containing adhesive and the base material and impregnated with lubricating oil needs to be heated at high temperature in order to increase the oil content. (120°C-130°C) is immersed in lubricating oil for a long time (about 7 days), and there are following problems: the resin forming the lubricating oil or the cage may deteriorate or a large dimensional change may be seen, and the stability of the product may be poor. It is difficult to maintain stable lubrication for a long time

[0013] However, in the rolling bearings of Patent Document 1 and Patent Document 6, if the porous cage is impregnated with fluorinated oil as lubricating oil, there is The centrifugal force of the cage increases, the rotation efficiency of the bearing decreases, and the torque variation also increases.

In addition, this conventional rolling bearing cannot be said to have sufficient reliability even in terms of durability under the use condition of high surface pressure (about 2 GPa).

[0014] In the bearing of patent document 7, although the problem of the bearing using the above-mentioned fluorinated oil is solved, since the communicating air holes of the cage are 5-25%, so There are problems in that the amount of lubricating oil that can be impregnated is small, and the service life cannot be extended sufficiently

[0019]However, in these food machinery rolling bearings, although the solid lubricant does not flow out into the water, it becomes greasy because the resin and the lubricant are kneaded in advance, and then It is manufactured by enclosing it in the bearing and sintering it. Even if the disclosed high-temperature resin and high-temperature grease are used in combination, there is a possibility that the lubricating oil will deteriorate during sintering due to the high sintering temperature of the resin.

Therefore, in application, there may be restrictions on the combination of high-temperature resins and high-temperature greases, and there is a problem that the degree of freedom of combination according to applications is reduced (Patent Document 8 to Patent Document 10)

In addition, in order to prevent the bearing from rusting, the amount of sealing is increased, and there is a problem that the torque of the bearing until fusion is increased (Patent Document 8)

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