JPH0560142A - Holder for rolling bearing - Google Patents

Abstract

PURPOSE:To use a holder for a long period in the high-temperature atmosphere by forming a resin film having the heat resistance higher than that of nylon resin and transmitting no oxygen on the whole surface of a holder substrate made of nylon resin. CONSTITUTION:The whole surface of the holder substrate H made of nylon resin such as polyamide (nylon 6, 6) of a holder is completely covered with a polymer resin film having excellent airtightness and adhesion, no oxygen permeability, and heat resistance and not peeled when folded. Phenol resin or silicone resin can be used for the polymer resin, and such resin is formed by dipping and aging for the preset period at the preset temperature, for example. Oxygen is prevented from being brought into contact with the surface of the holder substrate H by the polymer resin film, and the heat deterioration of the nylon resin hardly occurs when it is used in the high-temperature atmosphere. The production cost can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing cage for holding rolling elements.

[0002]

2. Description of the Related Art Generally, a rolling bearing is one in which rolling elements such as rollers or steel balls are interposed between an inner ring and an outer ring, and these rolling elements are held by a cage. As the cage for the rolling bearings, resin cages are used in addition to metal cages, and resin cages are generally nylon-6, nylon-11, nylon-12, nylon-6. 6. Nylon resin such as Nylon-MDX is often used.

[0003]

However, the above-mentioned nylon resin cannot be used for a long time in a high temperature atmosphere because thermal deterioration due to oxidation progresses in a high temperature atmosphere exceeding 100 ° C. and various physical properties deteriorate. In order to deal with this, recently, as a material for the cage, polyphenylene sulfide (PPS) and polyether sulfone (PE) are used.
S): High temperature plastic called special engineering plastic such as polyetheretherketone (PEEK) is used. However, this special engineering plastic has the problems that it does not have the physical properties (toughness, flexibility, high elasticity, abrasion resistance, etc.) as a cage as nylon resin, and the price is too high.

In view of the above, an object of the present invention is to provide a cage for a rolling bearing which is inexpensive and can be used for a long time in a high temperature atmosphere.

[0005]

According to the means for solving the problems according to the present invention, a resin coating having heat resistance higher than that of nylon resin and impermeable to oxygen is formed on the entire surface of a cage base made of nylon resin. It is a thing.

[0006]

In the above means for solving the above problems, the oxygen does not come into contact with the surface of the cage substrate due to the resin coating, so that even if the cage is used in a high temperature atmosphere, the nylon resin as a material of the cage substrate is thermally deteriorated by oxidation. Hateful. Moreover, the annealing effect increases the crystallinity of the nylon resin, and the cage is more stable and improved in physical properties.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a partially cutaway perspective view showing a cage of a rolling bearing according to an embodiment of the present invention. The cage shown in FIG.
A crown type cage for deep groove ball bearings, in which a steel ball B is press-fitted and held in a pocket H1.

This cage is a cage base H made of nylon resin such as polyamide (nylon-6.6 etc.).
Is completely covered with a polymer resin film which is excellent in airtightness and adhesion, has no oxygen permeability, has heat resistance and does not peel off even when bent. Examples of the polymer resin include those made of phenol resin or silicone resin, and these resins are formed by dipping and aging at a predetermined temperature for a predetermined time.

In the above structure, oxygen does not come into contact with the surface of the cage base H due to the polymer resin coating, so that the nylon resin is less likely to be thermally deteriorated (oxidatively deteriorated) even when the cage is used in a high temperature atmosphere, and the adhesiveness is improved. Will increase. Therefore, the nylon resin is simply subjected to heat history. Moreover, the annealing effect increases the crystallinity of the nylon resin, and the cage is more stable and improved in physical properties.

Here, as described above, a comparison of the heat resistance of a cage made of a heat-resistant resin containing a polymer resin film on the surface of a nylon resin cage base and that not forming it, and a cage made of a heat-resistant resin containing special engineering plastics. The data are shown in FIG. In FIG. 2, the outer diameter is 39.5 mm and the inner diameter is 31.5 m.
m, a crown-shaped cage with a pocket diameter of 9 mm is used.
The tensile fracture strength after applying i-type grease and standing at 170 ° C. or 185 ° C. for 240 hours is compared.

As is clear from the column A in the figure, the PA66
It was confirmed that in the cage containing 25% GF therein, the decrease in the tensile fracture strength was suppressed more when the polymer resin film was formed than when it was not formed. Further, as is clear from columns A and B to E, when a polymer resin coating is formed on a nylon resin cage, the cage has a tensile fracture strength in a high temperature atmosphere made of a heat-resistant resin cage including special engineering plastics. It was confirmed that it is maintained at the same level or higher. As described above, since the progress of thermal deterioration in a high temperature atmosphere can be prevented without using special engineering plastics, the manufacturing cost can be low.

[0012]

As is apparent from the above description, according to the present invention, oxygen is brought into contact with the surface of the nylon resin constituting the cage substrate by the resin coating having higher heat resistance than nylon resin and having no oxygen permeability. Therefore, the nylon resin is less likely to be thermally deteriorated in a high temperature atmosphere. Therefore,
It has an excellent effect that it can be used for a long time in a high temperature atmosphere and the manufacturing cost is reduced.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a cage of a rolling bearing according to an embodiment of the present invention.

FIG. 2 is a diagram showing comparative data regarding heat resistance of a cage made of a heat-resistant resin with and without a polymer resin coating formed on the surface of a nylon resin cage base, and with a special engineering plastic.

[Explanation of reference numerals] H cage base H1 pocket

Claims (1)

[Claims] 1. The entire surface of a cage base made of nylon resin,
A cage for rolling bearings, characterized in that a resin coating having heat resistance higher than that of the nylon resin and impermeable to oxygen is formed.