JPH09291941A - Roller bearing using cage made of resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent dust in lubricating oil form residing in the vicinity of each protrusion, to reduce the occurrence of early wear of a roller, and provide an increased life by a method wherein a hemispherical inside protrusion and a hemispherical outside protrusion are formed on the inner wall surface of a pocket and the each protrusion is brought into contact with a roller in a roller bearing using a cage made of a resin. SOLUTION: In a roller bearing 11, pockets 14, 14... to hold a plurality of rollers 16 are formed at the cylindrical body 13 of a cage 12. Tow hemispherical inside protrusions 17 and 17 and hemispherical outside protrusion 18 and 18 are formed on inner wall surface 15 and 15 positioned facing peripherally of each pocket 14. The part, where the hemispherical protrusions 17 and 18 are not formed, of the inner wall surface 15 forms an oil passage 19 and the oil passage is ensured a wider manner. Dust is prevented from residing in the vicinity of hemispherical protrusions 17 and 18 and early wear of the roller 16 due to dust is prevented from occurring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller bearing using a resin cage suitable for use in planetary gear speed reducers such as hydraulic excavators and hydraulic cranes.

[0002]

2. Description of the Related Art First, a roller bearing using a resin cage according to Japanese Patent Application Laid-Open No. 7-103240 will be described with reference to FIGS.

In the figure, reference numeral 1 denotes a roller bearing using a resin cage, and the roller bearing 1 is composed of a cage 2 described later and a plurality of rollers 6, 6, ....

Reference numeral 2 denotes a cage which constitutes a roller bearing 1 together with each roller 6 which will be described later. The cage 2 is formed of a resin material as a cylindrical body 3, and the cylindrical body 3 has a predetermined circumferential dimension. A large number of pockets 4, 4, ... Composed of rectangular through holes that are spaced apart from each other and penetrate from the inner side to the outer side in the radial direction are formed over the entire circumference. Further, of the side surfaces of each pocket 4, the side surfaces facing each other in the circumferential direction are inner wall surfaces 5 and 5.

Reference numerals 6, 6, ... Show rollers formed of a metal material or the like as a cylindrical body. Each roller 6 is constituted as a needle roller, a rod roller or the like, and each roller 6 of the cage 2 is formed. Each pocket 4 is regularly stored.

Reference numerals 7, 7 ... Represent trapezoidal inner protrusions formed as substantially trapezoidal protrusions, and 8, 8, ... Represent triangular outer protrusions formed as substantially triangular protrusions. The trapezoidal inner protrusions 7 extend axially on the inner wall surfaces 5 of the pockets 4 on both sides in the axial direction and on the opening edges on the inner diameter side, and the triangular outer protrusions 8 also open on the outer diameter side. It is located at the edge, extends in the axial direction, and is formed to face each other in the circumferential direction. The trapezoidal inner projections 7 and the triangular outer projections 8 are engaged with the rollers 6 to prevent the rollers 6 from falling off.

Reference numerals 9A, 9B and 9B denote oil passages through which lubricating oil flows, and the oil passages 9A and 9B except the portions where the trapezoidal inner protrusions 7 and the triangular outer protrusions 8 are formed are pockets 4. Is formed between the inner wall surface 5 and the side surface of 6 and the oil passage 9A is located at the axially intermediate portion of the pocket 4, and each oil passage 9B
Are located at both ends in the axial direction. Then, by circulating the lubricating oil from the radially inner side of the cage 2 to the outer side by centrifugal force through the oil passages 9A and 9B, the flow of the lubricating oil and the amount of the lubricating oil in the roller bearing 1 are secured. To do.

The width d of each pocket 4 is set in consideration of the diameter of the roller 6 in order to secure the movement amount of the lubricating oil, so that the lubricity of the roller bearing 1 is improved. It has become.

Next, the prior art roller bearing 1 constructed as described above is used as a target for use in, for example, a crawler belt drive device of a construction machine or the like, and a planetary gear in each reduction gear mechanism of the planetary gear reduction device. It is used when it is pivotally supported on the carrier via the pin.

Here, in order to lubricate the roller bearing 1, the lubricating oil in the housing, which is the outer shape of the planetary gear speed reducer, enters the roller bearing 1 through the pin. At this time, the lubricating oil flows radially from the inner side to the outer side of the cage 2 by the centrifugal force generated when the planetary gear rotates, and the trapezoidal inner protrusion 7 and the triangular outer protrusion 8 are not formed. The oil is circulated through each of the oil passages 9A and 9B of the portion and discharged into the housing. As a result, the lubricity of the roller bearing 1 is improved.

[0011]

By the way, in the roller bearing 1 according to the above-mentioned prior art, when abrasion powder or dust such as a seal piece of the seal member is generated due to sliding wear of components other than the bearing, The dust collects in the housing and flows by stirring the lubricating oil.

Therefore, the dust inside the housing rides on the flow of the lubricating oil and enters the pockets 4 of the roller bearing 1. Here, on the inner wall surface 5 of each pocket 4, a trapezoidal inner projection 7 formed in a trapezoidal shape and extending in the axial direction in order to prevent the rollers 6 from falling off, and a triangular shape formed in a triangular shape and extending in the axial direction. Outer protrusions 8 are formed. For this reason,
The space between the inner wall surfaces 5 and 6 of the pocket 4 becomes narrow, and the dust that has entered the pockets 4 together with the lubricating oil is scraped off by the trapezoidal inner protrusion 7 and the triangular outer protrusion 8.
Stay between these.

As a result, the rollers 6 in each pocket 4 are abraded early by dust accumulated in the trapezoidal inner protrusion 7 and the triangular outer protrusion 8, particularly metal abrasion powder such as iron powder, There is a problem that the life of the roller bearing 1 is shortened.

In particular, when the conventional roller bearing 1 is used in a planetary gear speed reducer, the roller bearing 1 receives low speed and large torque, so that the rollers 6 in each pocket 4 are easily worn, When 6 wears, there is a problem that the operating efficiency of the planetary gear speed reducer is significantly reduced.

Further, in the case of manufacturing the cage 2 made of resin, injection molding with high production efficiency is generally used, but the mold release after molding is performed by utilizing the elastic deformation of the triangular outer protrusions 8. The method of forcing the mold out of the molded product is used. Therefore, in the conventional manufacturing of the cage 2, there is a problem that an unreasonable force is applied to the die when the cage 2 and the die are released from each other, and the life of the die is shortened.

Further, in the cage 2, when the rollers 6 are housed and held in the pockets 4 of the cage 2, the triangular outer projections 8 are forcibly held by utilizing elastic deformation. Therefore, there is a problem in that the work efficiency of storing the rollers 6 in the pockets 3 of the cage 2 is reduced.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention is a resin which can efficiently perform lubrication with a lubricating oil to prevent dust from staying in each pocket of the cage. It is an object of the present invention to provide a roller bearing using a cage made of steel.

[0018]

In order to solve the above-mentioned problems, the features of the structure adopted by the invention according to claim 1 are as follows:
The cage is composed of a cylindrical body formed of a resin material in a cylindrical shape, and a plurality of pockets formed in a rectangular shape so as to be separated from each other in the circumferential direction of the cylindrical body. In order to rotatably retain the inside of each pocket, the inner wall surface of each pocket is provided with a hemispherical inner protrusion located on the radially inner side and a hemispherical outer protrusion located on the radially outer side, respectively. is there.

With the above structure, the rollers can be housed and held in the pocket by the hemispherical inner protrusion and the hemispherical outer protrusion. At this time, by holding the rollers in point contact with the hemispherical inner projections and the hemispherical outer projections, dust collects near these hemispherical projections while the lubricating oil flows in the radial direction of the cage. Can be prevented.

According to the second aspect of the invention, the hemispherical inner protrusion and the hemispherical outer protrusion are formed on substantially the same radial line with respect to the inner wall surface of each pocket.

With the above construction, the roller is held between the hemispherical inner projections and the hemispherical outer projections located on the inner and outer sides on the radial line of the inner wall surface, and these hemispherical projections reliably hold the roller. can do.

According to the third aspect of the invention, the hemispherical inner protrusion and the hemispherical outer protrusion are formed on different radial lines with respect to the inner wall surfaces of the pockets.

With the above construction, since the hemispherical inner protrusion and the hemispherical outer protrusion are not located on the radial line, it is possible to secure a large oil passage for the lubricating oil flowing from the radial inner side to the outer side of the cage. it can.

[0024]

FIG. 1 is a block diagram showing an embodiment of the present invention.
9 to FIG. It should be noted that the same components as those of the above-described conventional technique are designated by the same reference numerals and the description thereof will be omitted.

First, FIGS. 1 to 3 show a first embodiment. In the drawings, 11 is a roller bearing applied to this embodiment, and the roller bearing 11 includes a cage 12 described later and a plurality of roller bearings. Around 1
, 16, ...

Reference numeral 12 denotes a cage that constitutes the roller bearing 11 together with each roller 16, and 13 denotes a tubular body that constitutes the outer shape of the cage 12, respectively. The tubular body 13 is a means such as injection molding of a resin material. It is formed by using.

.. are a plurality of pockets which are formed so as to be separated from each other by a predetermined dimension in the circumferential direction of the cylindrical body 13 and penetrate from the inner diameter side to the outer diameter side, and each pocket 14 is formed in a rectangular shape. By doing so, each of the rollers 16 described below is held. Further, of the side surfaces of each pocket 14, the surfaces facing each other in the circumferential direction become the inner wall surfaces 15, 15.

.. are rollers formed of a metal material or the like as a cylindrical body, and each roller 16 is constituted as a needle roller, a bar roller or the like. The rollers 16 are regularly arranged and held in the pockets 14 of the cage 12.

, 17, denote hemispherical inner protrusions,
The hemispherical inner protrusions 17 are located at two positions on both sides in the axial direction of the inner wall surface 15 of each pocket 14 and at the opening edges on the inner diameter side, and are integrally formed on the cage 12 so as to face each other in the circumferential direction. Has been done.

18, 18, ... Denote hemispherical outer protrusions,
The respective hemispherical outer protrusions 18 are located at two locations on both sides in the axial direction of the inner wall surface 15 of each pocket 14 and at the outer edge of the outer diameter side, and are integrated with the cage 12 so as to face each other in the circumferential direction. Has been formed.

Here, the hemispherical inner protrusion 17 and the hemispherical outer protrusion 18 are formed on substantially the same radial line with respect to the inner wall surface 15 of each pocket 14, and each hemispherical inner protrusion 17 and each hemispherical inner protrusion 17 are formed. The hemispherical outer protrusions 18 and the rollers 16
Since the ball is stored in the pocket 14 in a point contact state, it is possible to reliably prevent the roller 16 from falling off.

.. are oil passages through which lubricating oil flows,
The oil passages 19 are formed between the inner wall surface 15 and the side surface of the pocket 14 of the pocket 14 except the portions where the hemispherical inner protrusions 17 and the hemispherical outer protrusions 18 are formed.
9 is located at the axially intermediate portion and both axially opposite ends of the pocket 14. Then, in the cage 12, the lubricating oil is circulated from the radially inner side to the outer side of the cage 12 through the respective oil passages 19 by centrifugal force, whereby the flow of the lubricating oil and the lubricating oil in the roller bearing 11 are The amount of oil is secured.

The roller bearing 11 of this embodiment having the above-described structure has a large number of rollers 1 in each pocket 14 of the cage 12.
In order to accommodate 6, the rollers 16 are provided with hemispherical inner projections 17, 17 formed on the inner peripheral side of the inner wall surface 15 of each pocket 14.
And hemispherical outer protrusions 18, 1 also formed on the outer peripheral side
The rollers 16 can be rotatably held by engaging with the rollers 8 in a point contact manner. Moreover, the oil passage 19 of the lubricating oil formed between the side surface of the roller 16 and the inner wall surface 15 of the pocket 14 can be secured between these hemispherical projections 17 and 18 largely.

However, when the roller bearing 11 according to the present embodiment is used in a planetary gear speed reducer, the lubricating oil in the casing is moved from the radially inner side of the cage 12 to the pockets by the action of the centrifugal force of the planetary gears. The gas flows into the inside 14 and goes radially outward and flows out radially. At this time, it is possible to secure a large oil passage 19 formed between the side surface of the roller 16 and the inner wall surface 15 of the pocket 14, so that the dust accumulated in the housing is near the hemispherical protrusions 17 and 18. It is possible to prevent stagnation.

As a result, unlike the prior art, the roller bearing 11 is extended in life without prematurely abrading the roller 16 by the dust accumulated in the vicinity of the protrusion.
When 1 is used for the planetary gear speed reducer, the operation efficiency of the planetary gear speed reducer can be stabilized for a long period of time.

On the other hand, since the cage 12 of this embodiment is made of a resin material, the end face of the cylindrical body 13 and the end face of the carrier can be brought into direct contact with each other, and sliding plates such as thrust plates are eliminated. The number of parts can be reduced.

The retainer 12 is manufactured by injection molding of a resin material. The mold release is carried out by utilizing the elastic deformation of these hemispherical projections 17 and 18 to mold the mold. I try to keep it away from me. However, since the protrusions 17 and 18 according to the present embodiment are formed in a hemispherical shape, the protrusions 7 and 18 are formed at the time of mold release when manufacturing the cage 2 according to the conventional technique.
The amount of elastic deformation applied to No. 8 can be greatly reduced, and the life of the mold can be extended.

Further, during the assembly work, the rollers 16, 16,
When the ... Is housed in each pocket 14, the hemispherical projections 17 and 18 formed on the resin cylindrical body 13 are elastically deformed, but the elastic deformation amount is significantly reduced as compared with the prior art. Therefore, the rollers 16 can be easily stored in the pockets 14 and the workability of assembling the planetary gear speed reducer can be improved.

Next, FIGS. 4 and 5 show a second embodiment of the present invention.
The present embodiment is characterized in that the positions of the hemispherical inner projections and the hemispherical outer projections formed on the inner wall surface of the pocket according to the first embodiment described above are set to the positions on both sides in the axial direction and the central portion. It is formed at three positions on the same radial line. In this embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, 21 indicates a roller bearing used in this embodiment instead of the roller bearing 11 according to the first embodiment,
The roller bearing 21 is composed of a cage 22 described later and a plurality of rollers 16, 16, ....

Reference numeral 22 denotes a retainer according to the present embodiment, which is made of a resin material as a cylindrical body 23 and is molded by means such as injection molding. And penetrates from the inner diameter side to the outer diameter side,
A plurality of rectangular pockets 2 each holding
4, 24, ... Are formed. Of the side surfaces of each pocket 24, the surfaces facing each other in the circumferential direction are inner wall surfaces 25, 25. The cylindrical body 23 of the retainer 22 is sandwiched between the end faces of the carrier.

.. are hemispherical inner protrusions, and each hemispherical inner protrusion 26 is an inner wall surface 25 of each pocket 24.
Of the cage 2 at three positions on both sides in the axial direction and in the center, and at the opening edges on the inner diameter side, facing each other in the circumferential direction.
2 are integrally formed.

27, 27, ... are also hemispherical outer projections, and each of the hemispherical outer projections 27 is located on three sides of the inner wall surface 25 of each pocket 24 in the axial direction and at the central portion and on the outer diameter side. It is located at the opening edge and is integrally formed with the retainer 22 so as to face each other in the circumferential direction.

Further, the hemispherical inner protrusion 26 and the hemispherical outer protrusion 27 are formed on the same radial line with respect to the inner wall surface 25 of each pocket 24, and each of the rollers 16 is formed by the respective protrusions 26, 27. Since the ball is stored in the pocket 24 in a point-contact state, it is possible to reliably prevent the roller 16 from slipping off.

28, 28, ... are oil passages through which lubricating oil flows,
Each of the oil passages 28 is provided on the inner wall surface 25 of the pocket 24 except for the portions where the hemispherical projections 26 and 27 are formed.
It is formed between the side surface and. Then, in the cage 12, the lubricating oil is circulated from the inside in the radial direction of the cage 12 to the outside through the respective oil passages 28 by centrifugal force, whereby the flow of the lubricating oil and the lubricating oil in the roller bearing 11 are The amount of oil can be secured.

The roller bearing 21 of the present embodiment having the above-described structure is formed on the inner wall surface 25 of each pocket 24 in order to house the roller 16 in each pocket 24 of the cage 22.
By engaging the hemispherical projections 26 and 27 individually, the rollers 16 are rotatably held, and inside the pocket 24 excluding the side surfaces of the rollers 16 and the hemispherical projections 26 and 27. A gap that serves as an oil passage 28 for the lubricating oil can be formed between the wall surface 25 and the wall surface 25.

Thus, also in the roller bearing 21 according to the present embodiment, it is possible to obtain the same effect as that of the first embodiment, and further, in this embodiment, the projections 26 and 27 are provided as compared with the first embodiment. By installing 3 pieces each,
The holding power of can be improved.

Next, FIGS. 6 and 7 show a third embodiment of the present invention.
The present embodiment is characterized in that the positions of the hemispherical inner protrusion and the hemispherical outer protrusion formed on the inner wall surface of the pocket according to the first embodiment described above are on different radial lines. The hemispherical inner protrusion toward the center in the axial direction.
The individual hemispherical outer protrusions are formed on both sides in the axial direction. In this embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, 31 indicates a roller bearing according to this embodiment, and the roller bearing 31 includes a resin retainer 32, which will be described later,
It is composed of a plurality of rollers 16, 16, ....

Reference numeral 32 shows a cage according to this embodiment, which is a cylindrical body 33 made of a resin material.
A plurality of pockets 3 which are formed in a rectangular shape and are spaced from each other by a predetermined dimension in the circumferential direction of the tubular body 33 and penetrate from the inner diameter side to the outer diameter side.
, 34, ..., Of the side surfaces of each pocket 34, the surfaces facing in the circumferential direction are the inner wall surfaces 35, 35.

.. are hemispherical inner protrusions, and each of the hemispherical inner protrusions 36 is an opening edge on the inner diameter side of the inner wall surface 35 of each pocket 34 and at two locations near the central portion in the axial direction. Is integrally formed with the retainer 32 at the position.

Denoted at 37, 37, ... are hemispherical outer protrusions, and each of the hemispherical outer protrusions 37 is held at the outer edge of the inner wall surface 35 of each pocket 34 on the outer diameter side and at both axial positions. It is formed integrally with the container 32.

The hemispherical projections 36 and 37 formed integrally with the cage 32 are arranged on different radial lines.

Denoted by 38, 38, ... are oil passages through which lubricating oil flows, and each oil passage 38 is formed on the inner wall surface 35 or 16 of the pocket 34 except for the portions where the hemispherical projections 36, 37 are formed. It is formed between the side surface. And the cage 3
By circulating the lubricating oil through the oil passages 38 from the radially inner side to the outer side in the radial direction of 2, the flow of the lubricating oil and the amount of the lubricating oil in the roller bearing 31 are secured.

In the roller bearing 31 of the present embodiment having the above-mentioned structure, the hemispherical inner protrusion 36 formed on the inner wall surface 35 of each pocket 34 in order to house the roller 16 in each pocket 34 of the cage 32. , 36 and the hemispherical outer protrusions 37, 37, the rollers 16 are rotatably accommodated and retained, and the side surfaces of the rollers 16 and the inner wall surface 35 of the pocket 34 are rotatably held.
A large gap serving as the oil passage 38 for the lubricating oil can be formed between and.

Thus, also in the roller bearing 31 according to this embodiment, it is possible to obtain the same effects as those of the first embodiment, and the hemispherical inner projection 36 and the hemispherical outer projection 3 are obtained.
7 is formed so as to have a different axial position, it is possible to secure a large oil passage 38, and it is possible to reliably prevent dust in the lubricating oil from staying near these hemispherical projections 36, 37. Therefore, the life of the bearing 31 can be extended.

Next, FIG. 8 shows a fourth embodiment according to the present invention. In the cage 42 according to this embodiment, the cylindrical body 4 is used.
The hemispherical inner protrusions 46 formed on the inner wall surfaces 45 of the plurality of pockets 44 formed in 3 are located at the central portion in the axial direction, and the hemispherical outer protrusions 47, 47 are formed on both sides in the axial direction. Thus, the protrusions 46, 47 are arranged in a staggered manner, and oil passages 48, 48, ... Are formed between the hemispherical protrusions 46, 47 and the outer peripheral surface of the place 16.

Further, FIG. 9 shows a fifth embodiment according to the present invention. In the retainer 52 according to this embodiment, the inner wall surface 55 of the plurality of pockets 54 formed in the tubular body 53 is formed. The hemispherical inner projections 56 and the hemispherical outer projections 57 are arranged alternately in a zigzag pattern, and oil passages 58, 5 are formed between the hemispherical projections 56, 57 and the outer peripheral surface of the place 16.
.. are formed.

The fourth and fifth embodiments constructed in this way
Also in this embodiment, as in the third embodiment described above, a large oil passage can be secured, wear of the rollers 16 can be reduced, and the life of the bearing can be extended.

In each of the above-mentioned embodiments, the positions of the hemispherical inner protrusion and the hemispherical outer protrusion are not limited to the positions of the first to fifth embodiments described above, and they may be arranged at various axial positions. The point is that it should be at a position where the rollers can be held and the oil passage can be secured.

[0061]

As described above in detail, in the roller bearing using the cage made of resin according to the first aspect of the present invention, each pocket of the cage is rotatably held inside and outside in the radial direction. By forming the hemispherical inner protrusion and the hemispherical outer protrusion on the inner wall surface of the pocket, it is possible to secure a large oil passage for the lubricating oil that flows from the radially inner side to the outer side of the cage, and to prevent abrasion powder and seal It is possible to prevent dust such as pieces from accumulating in the vicinity of each protrusion, especially to prevent early wear of the roller due to metal wear powder of the dust, and extend the life of the roller bearing. Furthermore, when the cage is manufactured by injection molding, the amount of elastic deformation applied to each hemispherical protrusion at the time of mold release can be reduced, and the life of the mold can be extended.

According to the second aspect of the present invention, the hemispherical inner projection and the hemispherical outer projection are formed on substantially the same radial line with respect to the inner wall surface of each pocket, so that the rollers retained in the pocket can be retained. It can be done reliably.

According to the third aspect of the present invention, by forming the hemispherical inner projection and the hemispherical outer projection on different radial lines with respect to the inner wall surface of each pocket, the side surface and the inner wall surface of the roller held in the pocket are formed. It is possible to secure a large oil passage formed between and, and it is possible to extend the life of the bearing.

[Brief description of drawings]

FIG. 1 is an enlarged side view showing a cage according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view as seen from the direction of arrows II-II in FIG.

FIG. 3 is a cross-sectional view as seen from the direction of arrows III-III in FIG.

FIG. 4 is an enlarged side view showing a cage according to a second embodiment.

FIG. 5 is a vertical cross-sectional view as viewed from a direction indicated by arrows VV in FIG. 4;

FIG. 6 is an enlarged side view showing a cage according to a third embodiment.

FIG. 7 is a vertical cross-sectional view taken along the line VII-VII in FIG.

FIG. 8 is an enlarged view of a cage according to a fourth embodiment.
It is a longitudinal cross-sectional view seen from the same position as.

FIG. 9 is an enlarged view of the cage according to the fifth embodiment.
It is a longitudinal cross-sectional view seen from the same position as.

FIG. 10 is a perspective view showing a cage used for a roller bearing according to the related art.

FIG. 11 is an enlarged side view showing a roller bearing according to the prior art.

12 is a vertical cross-sectional view as seen from the direction of arrow XII-XII in FIG.

13 is a cross-sectional view as seen from the direction of arrows XIII-XIII in FIG.

[Explanation of symbols]

 11, 21, 31 Roller bearings 12, 22, 32, 42, 52 Cages 13, 23, 33, 43, 53 Cylindrical bodies 14, 24, 34, 44, 54 Pockets 15, 25, 35, 45, 55 Inside Wall 16 Roller 17, 26, 36, 46, 56 Hemispherical inner protrusion 18, 27, 37, 47, 57 Hemispherical outer protrusion 19, 28, 38, 48, 58 Oil passage

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Kurihara 650 Kazunachi-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura factory

Claims (3)

[Claims] 1. A roller bearing using a resin cage comprising a cage formed of a resin material in a cylindrical shape and a plurality of rollers rotatably retained in the cage.
The cage comprises a cylindrical body formed of a resin material in a cylindrical shape, and a plurality of pockets formed in a rectangular shape so as to be separated from each other in the circumferential direction of the cylindrical body, and In order to rotatably hold the rollers in each pocket, the inner wall surface of each pocket is provided with a hemispherical inner protrusion located on the radially inner side and a hemispherical outer protrusion located on the radially outer side. A roller bearing using a resin cage. 2. The roller bearing using the resin cage according to claim 1, wherein the hemispherical inner protrusion and the hemispherical outer protrusion are formed on substantially the same radial line with respect to the inner wall surface of each pocket. . 3. The roller bearing using a resin cage according to claim 1, wherein the hemispherical inner protrusion and the hemispherical outer protrusion are formed on different radial lines with respect to the inner wall surfaces of the pockets.