JPH10318264A - Holder made of synthetic resin for rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of damage due to defective lubrication by high-efficiently circulating lubrication oil to a pocket to hold a roller in a rolling state. SOLUTION: A holder 9a made of synthetic resin is prevented from displacement in a radial direction based on the rolling surface of a roller 6 and engagement between lock protrusion part 13a and 14a on the inside diameter side and the outside diameter side. A gap between both the inner and outer peripheral surfaces of the holder 9a made of synthetic resin and mating surface is ensured. The protrusion parts 13a and 14a on the inside diameter side and the outside diameter side are provided only in the direction of length and a gap between the rolling surface and the opening edge part of a pocket 12b is ensured. Further, slopes 18 and 18 are formed at the two end parts on the inner peripheral surface of the holder 9a made of synthetic resin and lubrication oil is easy to enter the inside diameter side of the holder 9a made of synthetic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A synthetic resin cage for a roller bearing according to the present invention is incorporated in a roller bearing which constitutes a rotary support portion of various mechanical devices, and holds a plurality of rollers in a freely rolling manner. In particular, the synthetic resin cage for the roller bearing of the present invention is:
Even when the lubrication conditions of the rotary support part incorporating the above roller bearing are severe, the roller bearing may have early wear, peeling, seizure,
This prevents damage such as galling.

[0002]

2. Description of the Related Art Rolling bearings are incorporated in rotation supporting portions of various types of mechanical devices. In particular, as a rolling bearing for forming a rotation supporting portion to which a large load is applied, a roller bearing using a roller as a rolling element is used. FIG. 8 shows such a roller bearing 1. The roller bearing 1 includes an outer race 3 having a cylindrical outer raceway 2 on the inner peripheral surface, an inner race 5 having a cylindrical inner raceway 4 on the outer peripheral surface, and a rolling contact between the outer raceway 2 and the inner raceway 4. A plurality of rollers 6 movably provided,
And 6. Further, each of these rollers 6, 6 has an outer peripheral surface as a cylindrical rolling surface 7 that comes into contact with the outer raceway 2 and the inner raceway 4. Each of the rollers 6, 6 has a cage 8 formed by bending a metal plate to form a cylindrical body as a whole.
Are rotatably held in the pockets 12, 12 provided in the above.

Although the cage 8 incorporated in the roller bearing 1 shown in FIG. 8 is made of metal, the cost of manufacturing the cage and the roller bearing incorporating the cage can be reduced, and the distance between the cage and the cage can be reduced. For the purpose of reducing the sliding resistance of a cage, it is widely practiced to manufacture a cage by injection molding of a synthetic resin.
9 to 11 show an example of such a synthetic resin cage 9. The synthetic resin cage 9 is integrally formed by injection molding a synthetic resin having a low coefficient of friction and having oil resistance. The synthetic resin cage 9 includes a pair of rim portions 10 and 10 and a plurality of pillar portions 11 and 11 spaced apart from each other in the axial direction (the left-right direction in FIG. 9). These pillars 11, 11 are intermittently arranged in the circumferential direction, and their both ends are connected to the inner surfaces of the pair of rims 10, 10 facing each other. Rectangular space portions surrounded by four sides by circumferentially opposite side surfaces of the pillar portions 11 and 11 adjacent in the circumferential direction and inner surfaces of the pair of rim portions 10 and 10 facing each other are pockets 12a and 12a, respectively. And An inner diameter side locking projection 13 is provided on the inner end of the synthetic resin cage 9 in the diametrical direction on both circumferential sides of each of the pillars 11, 11.
Similarly, an outer diameter side locking projection 14 is formed at the outer end portion over the entire length of each of the column portions 11, 11.

In order to rollably hold the rollers 6 constituting the roller bearing by the above-mentioned synthetic resin cage 9, the rollers 6 are placed in the pockets 12 a, 12 a, respectively. Insert from the outside diameter side. At the time of this insertion work, the pillar portions 11, 11 partitioning both circumferential sides of these pockets 12 a, 12 a and the outer diameter side locking projections 14 formed on the side surfaces of these pillar portions 11, 11 are elastically deformed. While letting
The rollers 6 are pushed into the pockets 12a. The width W _{12a of} each of the pockets 12a, 12a in the circumferential direction at a portion deviating from each of the locking projections 13, 14.
Is the larger than the outer diameter D ₆ of the rollers 6 (W _12a> D
₆ ) Therefore, as shown in FIGS. 10 to 11, these rollers 6 can roll freely with a small force in each pocket 12a in a state where the rollers 6 are held in the pockets 12a. Also, the distance D _{13 in} the free state between the tip edges of the pair of inner diameter side locking projections 13, 13 present in the inner diameter side openings of the pockets 12 a, 12 a and the outer diameter side opening are present. Spacing D in the free state between the tip edges of the pair of outer diameter side locking projections 14, 14
_14, each smaller than the outer diameter D ₆ of the respective rollers _{6 (D 6 <D 13,} D 14). Therefore, each pocket 12,
Roller 6 held in each of these pockets 12, 1
There is no accidental dropout from inside 2.

[0005] In addition, a partial most over the radial thickness is greater among the synthetic resin cage 9, the thickness T ₁₀ of the respective rim portions 10, the outer diameter D ₆ of the respective rollers 6 (T ₁₀ <D ₆ ). Therefore, with these rollers 6 held in the pockets 12, a part of the rollers 6 protrudes from the outer peripheral surface and the inner peripheral surface of the synthetic resin cage 9. When the rollers 6 and the cage made of synthetic resin 9 are installed between the inner peripheral surface of the outer race 3 and the outer peripheral surface of the inner race 5, the inner peripheral surface of the outer race 3 and the rims 10, 10 An outer-diameter-side annular gap having a thickness of ΔD ₃ is formed between the outer peripheral surface of the inner ring 5 and each of the rim portions 1.
The thickness of the inner diameter side annular gap comprising △ D ₅ between the inner peripheral surface of 0,10 is formed over the entire periphery, respectively. During operation of the roller bearing incorporating the synthetic resin cage 9, lubricating oil flowing from the inner diameter side opening to the outer diameter side opening in each of the pockets 12a, 12a due to centrifugal force based on the revolving motion of each of the rollers 6 is formed. A flow is triggered. The lubricating oil lubricates a contact portion between the rolling surface of each roller 6 and the outer raceway 2 provided on the inner peripheral surface of the outer race 3 and the inner raceway 4 provided on the outer peripheral surface of the inner race 5.

[0006]

In the case of the conventional synthetic resin cage shown in FIGS.
If the lubricating oil does not easily flow into 2a and the lubricating conditions are severe, there is a possibility that the roller bearing may suffer damage such as early wear, peeling, seizure, and galling. The causes of the poor lubricating oil flow causing such damage are as follows.

[0007] The inner diameter side of each pocket 12a, 12a,
The gap between the outer peripheral edge portions of the two openings and the rolling surface of the roller 6 held in each of the pockets 6 is small. That is, a pair of inner diameter side locking projections 13 and 13 are provided on the inner circumference side peripheral edge of each of the pockets 12a and 12a, and a pair of outer diameter side locking projections 14 are provided on the outer diameter side opening circumference. 14 and pillar part 1
Since it is formed over the entire length of 1 and 11, the width of the gap becomes small. Then, the amount of lubricating oil flowing into each of the pockets 12a, 12a through the gap on the inner diameter side decreases, and each of the pockets 12a, 12a through the gap on the outer diameter side.
The amount of the lubricating oil flowing out of a is reduced. As a result, the amount of the lubricating oil flowing from the inner diameter side to the outer diameter side in each of the pockets 12a, 12a is reduced, and the amount of the lubricating oil is insufficient, or the amount of the lubricating oil existing in the pockets 12a, 12a is reduced. Temperature rises easily. An increase in the temperature of the lubricating oil is not preferable because it causes deterioration in lubrication performance due to a decrease in viscosity.

[0008] At least one of the inner and outer peripheral surfaces of the pair of rim portions 10 and 10 and an outer peripheral surface of an end of the inner race 5 or an inner peripheral surface of an end of the outer race 3 facing the peripheral surface. Gap is small. That is, in the case of the conventional synthetic resin cage 9, in order to prevent the synthetic resin cage 9 from being displaced in the radial direction, the outer peripheral surfaces of the pair of rims 10 and 10 are fixed to the outer ring. 3 or the inner peripheral surfaces of both rims 10 and 10 are close to the outer peripheral surface of the end of the inner ring 5. When the outer peripheral surfaces of the pair of rims 10, 10 are brought close to the inner peripheral surfaces of the ends of the outer race 3, the lubricating oil that has entered the pockets 12a, 12a flows out of the pockets 12a, 12a. Harder to do
The temperature of the lubricating oil present in these pockets 12a, 12a tends to rise. On the other hand, a pair of rims 10,
When the inner peripheral surface of the inner ring 10 is close to the outer peripheral surface of the end of the inner ring 5, lubricating oil does not easily flow into the pockets 12a, 12a, and the rolling surface of each roller 6 and the outer ring raceway 2, The lubricating oil existing between the inner ring raceway 4 and the inner ring track 4 tends to be insufficient.
The present invention is intended to eliminate such causes of poor lubricating oil flow, thereby preventing the occurrence of damage such as early wear, peeling, seizure, and galling on a roller bearing incorporating a synthetic resin cage. It was invented.

[0009]

A synthetic resin cage for a roller bearing according to the present invention is formed integrally with synthetic resin in the same manner as the above-mentioned conventional synthetic resin cage for a roller bearing.
The vehicle includes a pair of rims and a plurality of pillars. A pair of the rims are arranged at intervals in the axial direction, and a plurality of pillars are intermittently arranged in the circumferential direction, and each of the two ends is connected to the pair. Of the rim portion of the rim portion. And such a synthetic resin cage has an outer ring having a cylindrical outer raceway on an inner peripheral surface, an inner racer having a cylindrical inner raceway on an outer peripheral surface, and an outer race contacting the outer raceway and the inner raceway. The roller is provided with a plurality of rollers having a cylindrical rolling surface, and the plurality of rollers are rotatably held.

In particular, in the cage made of synthetic resin for a roller bearing according to the present invention, the outer diameter of each of the rims is set such that the rim and the outer ring are arranged concentrically with each other. The size is regulated to a size such that an outer-diameter annular gap having a thickness of 0.4 mm or more is formed between the outer peripheral surface and the inner peripheral surface of the outer ring.
The inner diameter of each rim is 0.75 mm or more between the inner peripheral surface of each rim and the outer peripheral surface of the inner ring in a state where the rim and the inner ring are arranged concentrically with each other. Is limited to the size where the inner diameter side annular gap is formed. In addition, at least the portion excluding the end portion closer to the inner diameter of the synthetic resin cage on both circumferential sides of each of the pillars has a width of each pocket existing between the pillars adjacent in the circumferential direction, The cage is inclined in a direction that becomes wider toward the outside in the diameter direction of the synthetic resin cage. The number of the respective pockets is n, and the intersection angle between a virtual straight line extending in the diameter direction of the synthetic resin cage passing through the center in the width direction of the respective pockets and the circumferential side surfaces of the respective column portions. When the inclination angle of each of these side surfaces is θ, the inclination angle θ is 0 degree <θ <(180
/ N) degree. In addition, a part of each of the pillar portions in the length direction on both circumferential sides of the pillar portion is provided to prevent the rollers that are rollably held in the pockets from falling out of the pockets. And a locking projection for preventing falling off. Further, the inner peripheral surfaces of both ends in the axial direction of the synthetic resin cage are formed as conical concave inclined surfaces inclined in such a direction that the inner diameter increases toward the axial end edge. Further, the rims and the pillars limit displacement in the radial direction based on engagement between the locking projections provided in the pockets and the rolling surfaces of the rollers held in the pockets. doing.

[0011]

According to the synthetic resin cage of the present invention constructed as described above, the lubricating oil can be efficiently circulated in the pockets for holding the rollers inside so as to freely roll. For this reason, a sufficient amount of lubricating oil flows through the contact surfaces between the rolling surfaces of the plurality of rollers, which are rotatably held by the synthetic resin cage, and the inner ring raceway and the outer ring raceway, so that early wear, Damage such as peeling, seizure, and galling can be effectively prevented.

[0012]

1 to 6 show a first embodiment of the present invention. The synthetic resin cage 9a for a roller bearing of the present invention has a low coefficient of friction and low oil resistance, similarly to the conventional synthetic resin cage 9 for a roller bearing shown in FIGS. Is formed integrally by injection molding, and includes a pair of rim portions 10a, 10a and a plurality of pillar portions 11a, 11a. The pair of rim portions 10a, 10a are arranged in a ring shape and are parallel to each other with an interval in the axial direction (left and right directions in FIGS. 1 and 4). Further, the plurality of pillars 11a, 11a are arranged at regular intervals in parallel with each other and intermittently in the circumferential direction, and both ends thereof are paired with the pair of rims 10a, 10a. Are continuous with the inner surfaces facing each other.

The outer diameter D _{10a of} each of the rim portions 10a, _10a
In a state where the rims 10a and 10a and the outer ring 3 (see FIG. 8) are arranged concentrically with each other,
0a, 10a and the inner peripheral surface of the outer ring 3
The thickness T ₃ (see FIG. 4) is restricted to a size where an outer diameter side annular gap of 0.4 mm or more is formed. That is, the respective rim portions 10a, the outer diameter of D _10a of 10a, respective rim 10a at the end portion of the outer ring 3, the inner diameter of the portion outer peripheral surface of 10a is opposed to the case of the R _3, R ₃ (Mm) ≧ D _10a
The outer diameter _D10a is regulated so as to satisfy (mm) +0.8 (mm).

The inner diameter R of each of the rim portions 10a, 10a
_10a is a state in which the rim portions 10a, 10a and the inner ring 5 (see FIG. 8) are arranged concentrically with each other.
Between the inner peripheral surface of the inner ring 5 and the inner peripheral surface of the inner ring 5;
The thickness T ₅ (see FIG. 4) is regulated to a size where an inner diameter side annular gap of 0.75 mm or more is formed. That is, the respective rim portions 10a, the inner diameter of 10a and R _10a, respective rim 10a at the end portion of the inner ring 5, the inner peripheral surface of 10a is the outer diameter of the portion facing the case of the D _5, R _10a (mm) ≧ D ₅
The inner diameter _R10a is regulated so as to satisfy (mm) +1.5 (mm).

On both circumferential sides of the pillars 11a, 11a, flat ends 15, 15 parallel to each other are formed at the end near the inner diameter of the synthetic resin cage 9a. , 15 are provided with inclined portions 16, 16, respectively. Each of the inclined portions 16, 16 has a width in the circumferential direction of each of the pockets 12b, 12b present between the column portions 11a, 11a adjacent in the circumferential direction, and is set in the diametrical direction of the synthetic resin retainer 9a. It inclines in a direction that becomes wider toward the outside. Then, each of these inclined portions 16, 1
6 is regulated as follows. The inclination angle θ is defined as a virtual straight line α (see FIG. 2) extending in the diameter direction of the synthetic resin retainer 9a passing through the center of the pockets 12b, 12b in the width direction, and the inclination angle of the inclined portions 16, 16. This is the intersection angle with the (virtual) extension plane. Such an inclination angle θ is restricted to a range of 0 degrees <θ <(180 / n) degrees when the number of the pockets 12b, 12b is n. The upper limit value of the inclination angle θ is determined by the column 11
a, 11a are angles at which both side surfaces in the circumferential direction are parallel to each other. As described above, it is preferable that the cross-sectional shapes of the pillars 11a and 11a are such that both side surfaces in the circumferential direction are parallel to each other.

The locking projections described in the claims are respectively provided on both sides in the circumferential direction of the column portions 11a, 11a near both ends of the column portions 11a, 11a in the longitudinal direction. The inner diameter side locking projections 13a, 13a and the outer diameter side locking projections 14a, 14a corresponding to
Is formed integrally with the synthetic resin cage 9a at the time of injection molding. Circumferentially over inner diameter side retaining projection 13a formed at a position facing each other, the distance D _13a of the leading edge between the 13a and the outer diameter side locking projections 14a, the spacing D of the leading edge between the 14a _14a is, in the free state of the synthetic resin cage 9a, respectively smaller than the outer diameter D ₆ of the roller 6 to be retained in the pockets _{12b (D 6> D 13a,} D
_14a ). Accordingly, the inner diameter side locking projection 13a,
13a holds the rollers 6 in the pockets 12b and 12b before the roller bearings are assembled before assembling the roller bearings.
The rollers 6 are prevented from being accidentally dropped from 2b and 12b to the inner diameter side of the synthetic resin cage 9a. On the other hand, the outer diameter side locking projections 14a, 14a also inadvertently fall the rollers 6 from the respective pockets 12b, 12b to the outer diameter side of the synthetic resin retainer 9a before assembling. Prevent things. The distance D _13a between the leading edges of the inner diameter side locking projections 13a, 13a, and the outer diameter side locking projections 14a, 14
Interval D _14a of the leading edge between the a, compared to the width W _12b over the circumferential direction of the body portion of the pocket 12b, 0.5 mm
Or smaller.

The inner peripheral surfaces of both ends of the synthetic resin retainer 9a, that is, the entire inner peripheral surfaces of the rim portions 10a and 10a and a part of the inner peripheral surfaces of the column portions 11a and 11a are formed as described above. Inner Diameter Side Locking Protrusions 13a, 13a and Outer Diameter Side Locking Protrusions 14
The inclined surfaces 18 and 18 are formed at portions closer to both ends in the longitudinal direction of the column portions 11a and 11a than a and 14a. Each of the inclined surfaces 18, 18 is inclined in such a direction that the inner diameter increases toward the axial end (the left-right direction in FIGS. 1 and 4) of the synthetic resin cage 9a.

Further, the rims 10a and 10a and the pillars 11a and 11a are connected to the pockets 12b and 12a, respectively.
b, the inner diameter side locking projections 13a, 13a and the outer diameter side locking projections 14a, 14a,
The displacement in the radial direction is limited based on the engagement of the rollers 6 held in the rollers 2b and 12b with the rolling surfaces. That is,
By bringing a part of each of the inner diameter side locking projections 13a, 13a and each of the outer diameter side locking projections 14a, 14a close to the rolling surface of the roller 6, the rollers are rolled in the pockets 12b, 12b. 6 is slightly displaced in the radial direction. Therefore, the rollers 6 rotatably held by the synthetic resin retainer 9a are combined with the outer race 2 and the inner race 4 (see FIG. 8).
And the synthetic resin cage 9a
Is hardly displaced in the radial direction. It is necessary to prevent the synthetic resin cage 9a from being displaced in the radial direction in order to prevent generation of vibration and noise.

The above-mentioned synthetic resin cage 9a of the present invention as described above.
Is an inner race 5 having a cylindrical outer raceway 2 on the inner peripheral surface and an inner race 5 having a cylindrical inner raceway 4 on the outer peripheral surface (see FIG. 8).
And a plurality of rollers 6 each having a cylindrical rolling surface whose outer peripheral surface is in contact with the outer ring raceway 2 and the inner ring raceway 4, and the plurality of rollers 6 are rotatably held. According to the synthetic resin cage 9a of the present invention which is configured as described above and is used in a state where it is incorporated in the roller bearing as described above, the pockets 12b for holding the rollers 6 in a freely rolling manner are provided inside, respectively. Lubricating oil can be efficiently circulated in 12b.

First, in order to form an outer diameter side annular gap having a thickness of 0.4 mm or more between the outer peripheral surface of each of the rim portions 10a, 10a and the inner peripheral surface of the outer ring 3, each of the pockets 12a,
The lubricating oil can be efficiently discharged from 12a toward the external space. Therefore, it is possible to suppress a rise in the temperature of the lubricating oil present in each of the pockets 12b, 12b, thereby preventing poor lubrication due to a decrease in the viscosity of the lubricating oil. In addition, each rim portion 10
a, a lubricating oil can be efficiently fed into each of the pockets 12b, 12b since an inner diameter annular gap having a thickness of 0.75 mm or more is formed between the inner peripheral surface of the inner ring 5 and the outer peripheral surface of the inner ring 5; . Therefore, in each of these pockets 12b, 12b,
A sufficient amount of lubricating oil can be secured.

Also, of the circumferential side surfaces of each of the pillars 11a, 11a, there is a diametrically outward portion of the flat portions 15, 15 formed at the inner diameter end of the synthetic resin cage 9a. The inclined portions 16, 16 are provided with the above-mentioned synthetic resin cage 9a.
Has a function of causing a flow of lubricating oil in each of the pockets 12b, 12b with the rotation of. That is, with the rotation of the synthetic resin cage 9a, each of the inclined portions 16, 1
6 presses the lubricating oil present in each of the pockets 12b, 12b in the circumferential direction. As a result, based on the centrifugal force as well as the component force directed outward in the diameter direction, each of the pockets 12b, 1
2b, the lubricating oil present in each of these pockets 12b,
Flow from the inner diameter side opening of 12b toward the outer diameter side opening. For this reason, a sufficient amount of lubricating oil flows efficiently in each of the pockets 12b.

In order to prevent the rollers 6 from falling off from the pockets 12b, 12b, the pillars 11a, 1b
1a, said inner diameter side locking projections 1 provided on both circumferential sides.
3a, 13a and outer diameter side locking projections 14a, 14a
Since the pillars 11a are provided only in a part of the length direction of the pillars 11a, the inner peripheral edges of the pockets 12b, 12b and the rolling of the rollers 6 rotatably provided in the pockets 12b, 12b. There is a relatively large gap between the surface.
Therefore, regardless of the presence of the inner diameter side locking projections 13a, 13a and the outer diameter side locking projections 14a, 14a, lubricating oil is fed into the respective pockets 12b, 12b and these respective pockets 12b, 12b Of lubricating oil from the engine can be efficiently performed.

Further, based on the existence of the conical concave inclined surfaces 18 formed on the inner peripheral surfaces of both ends of the synthetic resin cage 9a, the inner peripheral edges of both ends of the synthetic resin cage 9a and both ends of the inner ring 5 are formed. The width of the annular gap between the outer peripheral surface and the outer peripheral surface increases. Therefore, the lubricating oil can be smoothly fed into the pockets 12b.

As described above, according to the synthetic resin cage 9a of the present invention, the lubricating oil is fed into the pockets 12b, 12b, and the pockets 12b, 12b.
It is possible to efficiently discharge lubricating oil from b. Because of this,
Rolling surfaces of a plurality of rollers 6 rotatably held in the pockets 12b, 12b, the inner raceway 4 and the outer raceway 2
By flowing a sufficient amount of lubricating oil through the abutting portion, it is possible to effectively prevent the occurrence of damage such as early abrasion, peeling, seizure, and galling.

In the illustrated example, each of the pillars 11a, 1
On the outer peripheral side surface of the main body 1a, the holding portions made of synthetic resin are provided between the inner diameter side locking projections 13a, 13a and the outer diameter side locking projections 14a, 14a in the longitudinal direction of each of the pillar portions 11a, 11a. Recesses 17, 17 recessed inward in the diameter direction of the vessel 9a
Is formed. These recesses 17, 17 secure a gap between the outer peripheral surface of the synthetic resin cage 9a and the outer raceway 2 (see FIG. 8) provided on the inner peripheral surface of the outer race 3, and extend in the circumferential direction. The lubricating oil flows smoothly between the adjacent pockets 12b, 12b. By providing such recesses 17, 17, the flow of the lubricating oil in each of the pockets 12 b, 12 b is further smoothed, and early wear, peeling, seizure,
The effect of preventing damage such as galling can be further improved. However, it is not always necessary to provide such recesses 17 and 17.

FIG. 7 shows a second embodiment of the present invention.
An example is shown. In the first example described above, flat portions 15, 15 (FIGS. 2, 5)
However, in the case of this example, the flat portions 15 and 15 are not provided, and the pockets 12b and 1b are not provided.
The inclined portions 16, 16 are continued up to the inner diameter side opening 2b. Other configurations and operations are the same as those of the above-described first example.

Although the size of the roller bearing for implementing the present invention is not particularly limited, the outer diameter of the outer ring 3 is about 20 to 120 mm and the inner diameter of the inner ring 5 is 10 to be incorporated into a rotary support portion of a machine tool or the like. About 80 mm, width of outer ring 3 and inner ring 5 is 10
It can be preferably applied to a roller bearing of about 80 mm. The type of the lubricating oil to be used is not particularly limited.
It can be preferably used for a roller bearing which constitutes a rotation support portion using lubricating oil of about 50 cst.

[0028]

The synthetic resin cage for a roller bearing according to the present invention is constructed and operates as described above. Therefore, the roller bearing incorporating the synthetic resin cage can be subjected to early wear, peeling, seizure, galling, etc. This can prevent the occurrence of damage to the roller bearing and contribute to ensuring the durability and reliability of the roller bearing.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first example of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along the line BB in FIG.

FIG. 4 is a sectional view showing a state in which rollers are incorporated, with a part thereof being omitted.

FIG. 5 is a sectional view taken along line CC of FIG. 4;

FIG. 6 is a sectional view taken along the line DD.

FIG. 7 is a view similar to FIG. 2, showing a second example of the embodiment of the present invention;

FIG. 8 is a partially cutaway perspective view showing one example of a roller bearing.

FIG. 9 is a sectional view showing an example of a conventional synthetic resin cage for a roller bearing.

FIG. 10 is a cross-sectional view showing a state where rollers are incorporated, with a part thereof being omitted.

FIG. 11 is a sectional view taken along the line EE of FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roller bearing 2 Outer ring raceway 3 Outer ring 4 Inner ring raceway 5 Inner ring 6 Roller 7 Rolling surface 8 Cage 9, 9a Synthetic resin cage 10, 10a Rim part 11, 11a Column part 12, 12a, 12b Pocket 13, 13a Inner diameter Side locking projection 14, 14a Outer diameter side locking projection 15 Flat portion 16 Inclined portion 17 Concave portion 18 Inclined surface

Claims (1)

[Claims] 1. A pair of rims which are integrally formed of synthetic resin and are spaced apart from each other in the axial direction, and are arranged intermittently in the circumferential direction. An outer ring having a plurality of continuous pillar portions on inner surfaces of a pair of rim portions facing each other, an outer ring having a cylindrical outer raceway on an inner peripheral surface, and an inner race having a cylindrical inner raceway on an outer peripheral surface; ,
A roller bearing having a plurality of rollers whose outer peripheral surfaces are cylindrical rolling surfaces that contact the outer raceway and the inner raceway is incorporated into a roller bearing, and the plurality of rollers are rotatably held. In the container, the outer diameter of each rim portion is such that the thickness between the outer peripheral surface of each rim portion and the inner peripheral surface of the outer ring in a state where the rim portion and the outer ring are arranged concentrically with each other. The outer diameter side annular gap of 0.4 mm or more is regulated to a size where it is formed, and the inner diameter of each rim portion is set such that the rim portion and the inner ring are concentrically arranged with each other. The inner circumferential surface and the outer circumferential surface of the inner ring are regulated to have a size in which an inner diameter side annular gap having a thickness of 0.75 mm or more is formed. The portion of the synthetic resin cage except for the end near the inner diameter exists between the column portions that are adjacent in the circumferential direction. The width of each pocket is inclined in such a way that the width increases toward the outside in the diameter direction of the synthetic resin cage, the number of each pocket is n, and the pocket passes through the center in the width direction of each pocket. Assuming that the angle of inclination of each side surface, which is the intersection angle between a virtual straight line extending in the diameter direction of the synthetic resin cage and the circumferential side surfaces of each of the column portions, is θ, the angle of inclination θ is 0. Degree <θ <(180 /
n) The range of the degree is regulated, and the rollers which are rollably held in the respective pockets on the circumferentially opposite side surfaces of the respective column portions are partially provided in the length direction of the respective column portions. Locking projections are provided to prevent falling out of the pocket.The inner peripheral surfaces of both ends of the synthetic resin cage in the axial direction are such that the inner diameter increases toward the axial edge. The rims and the pillars are engaged with the locking projections provided in the pockets and the rolling surfaces of the rollers held in the pockets. Based on
A synthetic resin cage for roller bearings, characterized in that displacement in the radial direction is limited.