JPS61140616A - Rolling bearing with self-lubrication - Google Patents

Abstract

PURPOSE:To prolong life of bearing by providing an accommodating space for holding sealed lubricant in a retaining vessel and a small hole for discharging the sealed lubricant with centrifugal force. CONSTITUTION:An accommodating space 42 for holding sealed lubricant in a retaining vessel 4 retaining a cylindrical roller 3 at a proper interval is provided. Sealed lubricant 41 is held in the accommodating space 42, and a small hole 44 is provided in the accommodating space 42 to supply the sealed lubricant 41 to a track face 21 of an outer ring 2 and an outer diametral face of the retaining vessel 4 which requires lubrication, and the sealed lubricant 41 is supplied from the small hole 44 at the time of rotation of the cylindrical ball- and-roller bearing.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is suitable for use under conditions of use such as high temperatures, high vacuum, and special atmospheres, where conventional rolling bearings using dA f'4 agents such as oil and grease are not useful. The following also relates to a usable self-lubricating rolling bearing.

[Conventional technology]

When a rolling bearing is used under conditions where normal lubricants (oil, grease) are useless, such as high temperatures, high vacuum, or special atmospheres, solids may form in the parts that make up the rolling bearing, such as the bearing rings, rolling elements, and cage. Methods of coating with lubricants or metals with good thermal properties were used, and techniques were used in which solid lubricant powder was sprayed together with a gaseous medium onto the necessary locations such as the raceways and transfer surfaces of rolling bearings.

[Problem that the invention seeks to solve]

However, the conventional technology as described above has the following problems.

When using rolling bearings, coated with solid lubricants.

After the warm-temperature metal flakes off and is worn away on the raceway, it becomes unlubricated. As a result, durability is dominated by the force with which the coating peels off, so it is easily subject to chance, and there is wide variation in durability (and very short lifespans could occur).

In addition, solid lubricants and residual areas with good lubrication performance flake off and are uneven in size when they enter the rolling surface, and large ones act as foreign particles that increase contact stress, so they are difficult to roll. There was a possibility that fatigue life could be shortened.

Furthermore, when spraying solid lubricant powder, it is necessary to effectively adhere it to the rolling surface of the bearing for extra lubrication! It is not easy to apply IK, and if there is too much, the solid lubricant powder will run out, and if it is too little, the solid lubricant powder will not reach the required location and will flow out together with the gas medium.

[Means for solving problems]

The rolling bearing of the present invention has a storage chamber for holding the lubricant sealed in the cage, and a small hole bored in the storage chamber for releasing the sealed lubricant using centrifugal force, The storage chamber holds an encapsulated lubricant, and the small holes are initially coated with a solid lubricant or a metal with lubricant ability.

[For production-]

In the rolling bearing of this invention, the outer diameter surface or outer surface of the retainer is coated with a solid lubricant or a metal with heat-warming ability, so that heat can be maintained only with the coating for a long period after the start of use. . The lubricant is consumed when these coatings peel off due to mechanical destruction caused by friction or pressing force, and when metal coatings are fused due to the rotation of the bearing, high temperature atmosphere, or the synergistic effects of these two. Since the small holes in the storage chamber are opened just when the heating is performed, the lubricant sealed in the storage chamber is newly supplied to the raceway surface from that time, and the temperature is continued.

This sealed lubricant comes out in appropriate amounts from the small holes in the storage chamber, so it is less likely to accumulate or be wasted.

In addition, the release of the sealed lubricant from this small hole is caused by the rotation of the bearing,
This is directly caused by the centrifugal force that accompanies the rotation of the cage, so when the cage is stationary and no lubricant is required, no lubricant is supplied because the centrifugal force is zero, and the rotational speed increases and the weight of the necessary lubricant increases. As the centrifugal force increases, the amount of lubricant supplied increases.

Furthermore, it is directly and effectively supplied only to the areas where it is needed.

〔Example〕

FIG. 1 shows a first embodiment of the present invention.
A plurality of cylindrical rollers 3 as rolling elements are inserted between the outer ring 2 and the cylindrical rollers 3 at appropriate intervals.
In a cylindrical roller bearing consisting of a cage 4 for holding the bearing, the cage 4 contains a sealed lubricant (for example, a fixed lubricant).
A storage chamber 42 is provided for holding the. The size and shape of the storage chamber 42 may depend on the size of the cage, the pitch interval of the cylindrical rollers, etc.
It is also conceivable to reduce the number of cylindrical rollers 3 or make them thinner in order to increase the number of cylindrical rollers 3. The size of the storage chamber will depend on the location of use, conditions of use, etc., which one to give priority to.

Regarding the shape, it is necessary to decide on the difficulty of processing and cost.

In order to supply moisture to areas that require moisture, such as the outer diameter surface 43 of the retainer 4, a small hole 44 is provided in the storage chamber 42, and when the cylindrical roller bearing rotates, the small hole 44 allows water to be absorbed by centrifugal force. A trap is set so that the above-mentioned inclusion @ erasure 41 is supplied.

Therefore, depending on the size of the storage chamber 42 and the amount of ftjAM agent supplied, there may be one or more small holes, and if the small holes are provided in a radial direction from the center of the bearing, When the direction of rotation is in one direction, consideration should be given to the direction of rotation so that the enclosed lubricant can easily reach the parts that require lubrication, such as when increasing the angle.

The above-mentioned small hole gradient is initially closed with a solid lubricant 45 coated on the outer diameter surface 43 of the cage 4, or sealed with a coating of a metal having heat-warming properties at high temperatures, such as silver or gold. The situation is as follows. When used under such conditions as hard, high vacuum, etc., initial warmth is provided by the solid lubricant 45 or metal with lubricating ability applied to the outer diameter surface 43 of the cage 4, and this solid lubrication When the lubricant 45 or the metal with lubricating ability is used up, the small hole 44 that was initially sealed opens, and as the retainer 4 rotates, the sealed lubricant held in the storage chamber 42 is released. 41 is released from the small hole 44 by centrifugal force and contributes to warmth.

Therefore, lubrication to the necessary locations continues until the sealed lubricant is completely discharged.

The second embodiment shown below is a case of a ball bearing, specifically an angular contact ball bearing. In Fig. 2, '1:l is an inner ring, 2 is an outer ring, 3 is a ball as a rolling element, and 4 is a cage It is.

A solid lubricant 45 or a metal with lubricating ability is used to seal the small hole which serves as a discharge outlet for the sealed lubricant 41 contained in the cage 4.
It does not cover the entire outer diameter surface 43 of the retainer 4, but covers the parts that may come into contact with the inner diameter surface 21 of the outer ring 2 and the parts near it, and the central part of the outer diameter surface 43 of the cage 4 is coated. It has not been.

In this angular contact ball bearing as well, initially, the solid metal on the outer diameter surface 43 of the cage 4 exerts a warming effect, and when this warming effect ends as the bearing is used, The small hole 44 is opened, and the sealed lubricant 41 held in the storage chamber 42 is released from the small hole 44 by centrifugal force to warm the necessary area.

The third embodiment shown below is a case of a thrust cylindrical roller bearing, where 1 is an inner ring, 2 is an outer ring, 3 is a cylindrical roller as a rolling element, and 4 is a cage. In this thrust cylindrical roller bearing, the storage chamber 42 for the sealed lubricant 41 of the retainer 4 has two small holes 44 in the upper part and two small holes in the lower part as shown in FIG. Four small holes are drilled, and an enclosed lubricating agent 42 is held in the storage chamber 42.
is provided for centrifugal force. The upper surface 4 of this cage 4
6 and the lower surface 47 are each coated with a solid lubricant or a metal having a lubricating structure so as to seal the small hole grip that serves as the outlet for the sealed lubricant 41 held in the storage chamber 42. Initial warming is done by coated lubricants or metals. After the warmth caused by the coated lubricant and metal is completed, the lubricant sealed in the storage chamber is sequentially discharged from the small holes, and the warmth effect is carried out in the same manner as in the above two embodiments.

〔Effect of the invention〕

Since the rolling bearing of the present invention is configured as described above, under conditions such as high temperature and high vacuum, the period during which +11 lubricant is supplied is longer than that of a bearing simply coated with a solid lubricant. It is expected that the lifespan will be extended accordingly.

By doing so, it becomes possible to delay the opening of small holes due to wear on the floor, or to change the amount of lubricant supplied from the storage chamber depending on the timing, ensuring that the bearing is in optimal condition throughout its entire operating period. It is also possible to design it to be warm-hearted.

[Brief explanation of drawings]

Figures 1 to 3 are all sectional views of essential parts showing embodiments of the present invention. Figure 1 shows a first embodiment in which the invention is applied to a cylindrical roller bearing, and Figure 2 shows the same. A second embodiment applied to a ball bearing is shown, and FIG. 3 shows a third embodiment similarly applied to a thrust cylindrical roller bearing. Explanation of symbols

Claims (1)

[Claims] A rolling bearing consisting of an inner ring, an outer ring, a rolling element inserted between the inner ring and the outer ring, and a cage for holding the rolling elements at an appropriate interval, in which the cage holds an enclosed lubricant. and a small hole for discharging the lubricant sealed in this storage chamber using centrifugal force, and the small hole is initially covered with a solid lubricant or a metal with lubricating ability. A rolling bearing with self-lubricating ability.