JPS60241516A - Roller bearing - Google Patents

Abstract

PURPOSE:To improve the endurance life of a roller bearing by providing a lead film on the rolling surfaces of inner and outer rings and forming a holder of lead containing cupper system metal. CONSTITUTION:A rotor 13 is interposed between an outer ring 12 and an inner ring 11 to be held by a holder 14. Lead films 11b, 12b are provided on the antislip surfaces 11a, 12a of the inner and outer rings 11, 12 and the holder 14 is formed by the use of cupper system metal including lead. Thus, the frictional torque in the beginning of rotation between the inner and outer rings and the rotor can be reduced and the life of the bearing can be substantially elongated by the supply of lubricant for cupper for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial Application Field The present invention relates to a rolling bearing using a solid lubricant.

(2) Conventional technology In general, rolling bearings supply lubricants such as grease between the inner and outer rings and the rolling elements and between the rolling elements and the cage to reduce the sliding friction and rolling friction that occur in each opening. Efforts are being made to improve the durability of

By the way, when rolling bearings are used in conditions such as high vacuum, lubricants with high vapor pressure such as grease will evaporate into the atmosphere, so lubricants with low vapor pressure such as gold, silver, and lead will evaporate into the atmosphere. Requires the use of solid lubricants.

Figure 2 shows the conventional solid lubrication structure of a rolling bearing, showing the raceway surfaces of the inner ring 1 and outer ring 2, the surface of the rolling elements 3 interposed between the inner and outer rings, and the outer peripheral surface of the rolling element cage 4. Then, solid lubricant films 1a, 2as 3as are formed using the solid lubricant.
I was trying to form 4a'&.

However, all the sliding and rolling surfaces are covered with a solid lubricant film 1 a
%2a, 3a, and 4a lubrication structures maintain stable friction torque at the initial stage of rotation, but when the lubricant film wears or peels off, the solid lubricant cannot be supplied to the worn or peeled parts. This does not occur and the lubrication runs out, increasing frictional torque and ending the life of the bearing.

(3) Problems to be Solved by the Invention The problems to be solved by this invention are to use a solid lubricant to improve the durable life of bearings and to enable them to be used under high temperature and high vacuum conditions. At the point.

(43 Means for Solving Problems In order to solve the above problems, this invention provides a thin lead film on the raceway surfaces of the inner and outer rings, and the cage is formed of a lead-containing copper metal. .

(5) Operation The thin lead film provided on the raceway surfaces of the inner and outer rings acts as a lubricant by transferring to the rolling elements at the beginning of rotation.

Even if the thin lead film is rolled due to repeated friction between the inner and outer rings and the rolling elements and the raceway surface lacks lubrication, the lead transferred to the rolling elements promotes the supply of lead contained in the cage, preventing rolling and sliding. It maintains the lubrication of the parts without running out of lubrication.

(6) Example Hereinafter, the present invention will be explained based on the example shown in FIG. 1 of the accompanying drawings.

As illustrated, rolling elements 13 are interposed between the inner ring 11 and the outer ring 12, and the rolling elements 13 are held by a retainer 14.

The raceway surfaces 11a and 12a of the inner ring 11 and outer ring 12 are provided with thin lead M11b and 12b, and the cage 14 of the steel ball rolling element 13 is formed using a copper-based metal containing lead. .

Lead thin films 11b and 12 provided on the raceway surfaces of the inner and outer rings 11 and 12
b functions as a lubricant for the rolling elements 13 at the initial stage of rotation, and also serves to draw out the lead contained in the cage 14 transferred to the surface of the rolling elements 13.

Lead thin films 11b and 12 provided on the raceway surfaces of the inner and outer rings 11 and 12
b and retainer? The lead contained in the cage 14 has poor affinity with the copper constituting the cage 14, and therefore, the lead transferred to the surface of the rolling elements 13 takes out the lead contained in the cage 14 and transfers it to the sliding and rolling parts. In addition to supplying it as a lubricant,
This suppresses copper in the retainer 14 from being transferred to the rolling elements 13.

As a result of experiments, the thickness of the lead thin films 11b112b provided on the inner and outer rings 11 and 12 is preferably set to about 0.1 to 0.3 μm. By setting the above thickness, the torque is low and stable, and the amount of wear on the cage 14 is reduced. , and durability can be improved.

Incidentally, the thickness of the lead thin films 11b and 12b is set to 0.4 to 0.
When the thickness is increased to 6 μm, the lead thin film 1 on the inner and outer rings 11 and 12 is thicker than the transfer of lead from the cage 14 to the rolling elements 13. b.? 2b
As a result, the surface of the rolling elements 13 is covered with lead, and the retainer 14 wears out due to friction between the retainer 14 and the rolling elements 13, causing an increase in torque before supplying lead. This means that it cannot be expected to improve the durability of the bearing.

The copper-based metal that is the constituent material of the cage 14 is a reinforcing material for holding lead, and also satisfies the requirement of a soft metal that wears out due to the friction of the rolling elements 13. It has good affinity (adhesiveness) with the rolling element 13 and the inner and outer rings 11 and 12, so that even if it is transferred to the rolling element 13 and the inner and outer rings 11 and 12, it will not be rolled and lose its roundness. As a result, there is an advantage that the amount of peeling and becoming abrasion powder is small.

In addition, lead-containing copper-based metals emit less gas than other heat-resistant high 5-molecular materials even under high-temperature conditions in high vacuum (around 10 torr).
No abnormality occurs even after 10' rotation, and therefore, even when used in a vacuum tube such as an X-ray tube, the degree of vacuum will not be adversely affected.

Furthermore, the lead content of the cage 14 is suitably within a range that does not cause an increase in the cage wear rate, for example, about 7 to 11 inches.

The rolling bearing of the present invention has the above-mentioned configuration, and the steel ball rolling elements 13 have a raceway surface 11 a% of the inner ring 11 and the outer ring 12.
It is in contact with the lead thin films 11b and 12b provided on 12a and the cage 14 containing lead.

At the initial stage of rotation, the lead thin film 11b112 provided on the raceway surfaces of the inner and outer rings
When b is transferred to the surface of the rolling element 13, it acts as a lubricant.

Further, due to repeated friction between the inner and outer rings 11, 12 and the rolling elements 13, the lead thin films 11b and 12b are rolled, and the rolling surfaces 11a,
12a as a lubricant becomes insufficient, but at the same time, the lead transferred to the rolling elements 13 promotes the supply of lead from the cage 14, so that the lead between the inner and outer rings 11, 12 and the rolling elements 13 increases. The supply of lead is maintained, the lead lubricant is not depleted, and the bearing rotates smoothly.

(7) Effects As described above, since the present invention has the above-described configuration, there are the following effects.

(1) Since a thin lead film is formed on the raceway surfaces of the inner and outer rings, the friction torque between the inner and outer rings and the rolling elements at the initial stage of rotation can be reduced.

(II) Since the cage contains lead, this lead can be supplied between the inner and outer rings and the rolling elements, and by supplying the heat lubricant over a long period of time, the life can be significantly improved.

(lit) Since the cage is made of lead-containing copper metal,
Copper, the main component, has good compatibility with steel rolling elements, which reduces the generation of wear particles and reduces environmental pollution around the bearing.

(V) Since a thin lead film is formed on the raceway surfaces of the inner and outer rings, the sliding of the rolling element and the lubrication of the rolling surface are ensured by transfer to the rolling elements. This can be reduced to less than half that of bearings that do not.

In other words, if the wear of the pocket portion of the retainer affects the service life, then the life of a bearing with a thin lead film formed thereon will be more than twice as long as that of a bearing without such a film.

(V) Since the cage is made of lead-containing steel-based metal, it can be used in high vacuum and high temperatures without any problems.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a rolling bearing according to the present invention, and FIG. 2 is a longitudinal sectional view of a conventional rolling bearing. 11...Inner ring, 12...Outer ring, lla, 12a...
- Raceway surface, llb, 12b...Lead thin film, 13...Rolling element, 14...Cage Figure 2 1a 1]l: Figure 1

Claims (3)

[Claims] (1) A rolling bearing in which the rolling elements interposed between the inner and outer rings are held by a cage, characterized in that the raceway surfaces of the inner and outer rings are coated with a lead thin film, and the cage is made of lead-containing copper metal. Rolling bearings. (2) The thickness of the lead thin film provided on the raceway surfaces of the inner and outer rings is 0°1~
The rolling bearing according to claim 1, which has a diameter of 0.3 μm. (3) The lead content of the copper metal that forms the cage is 7 to 11.
% of the rolling bearing according to claim 1.