JP2000320558A - Synthetic resin cage for roller bearings - Google Patents

Abstract

(57) [Summary] [Problem] A pocket (12b) holding a roller (6) so as to roll freely.
The lubricating oil is efficiently circulated to prevent damage due to poor lubrication. In addition, the pillar portion 11a and the rim portion 10a,
The stress applied to the connecting portion with 10a is relaxed to improve the durability. SOLUTION: Roller 6 is prevented from falling off on the basis of engagement between a rolling surface of roller 6 and inner and outer diameter side locking projections 13a, 14a. These inner and outer diameter side locking projections 13a,
14a is provided only in a part of the length of the pillar 11a in the length direction, and a gap is secured between the rolling surface and the opening edge of the pocket 12b. Outer peripheral surface 20 of synthetic resin cage 9a and outer ring 3
Of the synthetic resin retainer 9
a is prevented from displacing in the radial direction.

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. Further, the present invention aims to improve the durability of the synthetic resin cage by preventing an excessive force from being applied to the pillar portion of the synthetic resin cage from the roller.

[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 rollers as rolling elements is used. FIG. 2 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, 6 movably provided
And 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. The rollers 6, 6 are rotatably held in pockets 12, 12 provided in a retainer 8, which is entirely formed into a cylindrical shape by bending a metal plate.

The cage 8 incorporated in the roller bearing 1 shown in FIG. 2 is made of metal. However, 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.
3 to 5 show an example of such a synthetic resin cage 9. This synthetic resin cage 9 has a low coefficient of friction,
Moreover, it is integrally formed by injection molding a synthetic resin having oil resistance. The synthetic resin cage 9 includes a pair of rims 10 and 10 spaced apart from each other in the axial direction (the left-right direction in FIG. 3) and a plurality of pillars 11 and 11. 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 Then, each of the pillars 1
The synthetic resin cage 9 is provided on both sides in the circumferential direction of 1 and 11.
The inner diameter side locking projection 13 is provided at the inner end in the diameter direction of
Similarly, an outer diameter side locking projection 14 is formed on 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. During this insertion work, the pillars 11, 11 partitioning both circumferential sides of the pockets 12 a, 12 a and the outer diameter side locking projections 14 formed on the side surfaces of the pillars 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. 4 and 5, the rollers 6 are held in the respective pockets 12a,
Rolling is possible with a light force in a. In addition, each pocket 1
The distance D _{13 in} the free state between the tip edges of the pair of inner diameter side locking projections 13, 13 existing in the inner diameter side openings of 2 a, 12 a, and the pair of outer diameters existing in the outer diameter side opening The distance D between the leading edges of the side locking projections 14 in a free state.
_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.

In the case of the synthetic resin cage shown in FIGS. 3 to 5, the lubricating oil does not easily flow into the pockets 12a, 12a.
Damage such as peeling, seizure, and galling may occur. The cause of the lubricating oil flow failure causing such damage is mainly due to the inner diameter side of each of the pockets 12a, 12a,
Outer diameter side both opening peripheral edges and these pockets 12a, 12a
This is because the gap between the rolling surface of the roller 6 held therein is small.

[0007] That is, a pair of inner diameter side locking projections 13, 13 are provided on the inner peripheral side opening rim of each of the pockets 12 a, 12 a.
A pair of outer diameter side locking projections 14 on the outer diameter side opening peripheral edge,
14 are formed over the entire lengths of the pillars 11 and 11, respectively, so that 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 the amount of lubricating oil flowing out of each of the pockets 12a, 12a through the gap on the outer diameter side decreases. As a result, the amount of lubricating oil flowing from the inner diameter side to the outer diameter side in each of the pockets 12a, 12a decreases, and the amount of lubricating oil becomes insufficient, or the pockets 12a, 12a,
The temperature of the lubricating oil present in 2a tends to increase. 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.

Japanese Patent Application Laid-Open No. 10-318264 discloses a cage made of synthetic resin which solves such a problem.
11 to 11 are described. The synthetic resin cage 9a for a roller bearing of the second example of the conventional structure is integrally formed by injection-molding a synthetic resin having a low coefficient of friction and having oil resistance, and includes a pair of rim portions 10a, 10a and a plurality of pillars 11a, 11a. The pair of rim portions 10a, 10a are arranged in a ring shape in parallel with each other with an interval in the axial direction (the left-right direction in FIGS. 6 and 9). In addition, the plurality of pillars 11a,
11a are arranged at regular intervals in parallel with each other and intermittently in the circumferential direction. Both ends are connected to the inner surfaces of the pair of rims 10a and 10a facing each other. I have.

The outer diameter D of each of the rim portions 10a, 10a_10a 
The rims 10a, 10a and the outer ring 3 (see FIG. 2)
) Are arranged concentrically with each other, and
0a, 10a and the inner peripheral surface of the outer ring 3
Thickness T_Three (Refer to Fig. 9) Outer diameter side annular clearance of 0.4mm or more
Is regulated to the size in which is formed. That is, each of the above rims
The outer diameter of the parts 10a and 10a is D_10a And the end of the outer ring 3
Outer peripheral surfaces of the rim portions 10a and 10a are opposed to each other.
The inner diameter of the part is R_Three And R_Three (Mm) ≧ D _10a 
(Mm) + 0.8 (mm)_10a To
Regulating.

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. 2) 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).

In addition, flat portions 15, 15 parallel to each other are formed at the ends of the pillar portions 11 a, 11 a, 11 a near the inner diameter of the synthetic resin retainer 9 a on both circumferential sides. , 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 existing 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. 7) extending in the diameter direction of the synthetic resin retainer 9a passing through the center in the width direction of each of the pockets 12b, 12b, 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. Note that the upper limit of the inclination angle θ is determined by the
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 pillar portions 11a, 11a are parallel to each other on both circumferential sides.

The circumferential direction of each of the pillars 11a, 11a
Intermediate in the longitudinal direction of each of these pillars 11a, 11a on both sides
Each part near the both ends is locked as described in the claim
Inner diameter side locking projections 13a, 13a and outer diameter corresponding to projections
The side locking projections 14a, 14a are attached to the synthetic resin cage 9a.
When injection molding is performed, it is formed integrally with the synthetic resin cage 9a.
Has formed. Formed at positions facing each other in the circumferential direction
Between the leading edges of the formed inner diameter side locking projections 13a, 13a
Interval D_13a , And the tip of the outer diameter side locking projection 14a, 14a
Edge spacing D_14a Is the free shape of the synthetic resin cage 9a.
In the state, each is held in each pocket 12b.
Outer diameter D of power roller 6₆ Smaller than (D ₆ > D_13a , D
_14a )are doing. Accordingly, the inner diameter side locking projection 13a,
13a has a roller 6 in each of the pockets 12b, 12b.
After holding, and before assembling the roller bearing, each pocket 1
Rollers 6 are the inner diameters of the synthetic resin cage 9a from 2b and 12b.
Prevents the side from accidentally falling off. On the other hand
The outer diameter side locking projections 14a, 14a are also
In addition, the rollers 6 from the above pockets 12b, 12b
Prevents accidental falling off to the outer diameter side of grease holder 9a
I do. In addition, the leading edge of the inner diameter side locking projections 13a, 13a.
Distance D between_13a , And the outer diameter side locking projections 14a, 14
distance D between the leading edges of a_14a Of the above pocket 12b
The width W of the body in the circumferential direction_12b 0.5mm compared to
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 these 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. 6 and 9) 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 cage 9a are combined with the outer race 2 and the inner race 4 (see FIG. 2).
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 synthetic resin cage 9a of the second example of the conventional structure as described above has an inner race 3 having a cylindrical outer raceway 2 on the inner peripheral surface and a cylindrical inner raceway 4 on the outer peripheral surface. 5
(See FIG. 2) and a plurality of rollers 6 having cylindrical outer circumferential surfaces that contact the outer raceway 2 and the inner raceway 4. Hold freely. According to the synthetic resin cage 9a of the second example of the conventional structure which is configured as described above and used in a state where it is incorporated in the roller bearing as described above, the rollers 6 are each held inside so as to be able to roll freely. The lubricating oil can be efficiently circulated in the pockets 12b, 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 the pillars 11a, 11a, the flat portions 15, 15 formed on the end near the inner diameter of the synthetic resin cage 9a are located radially outward. 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 presence 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.

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. Each of these recesses 17, 17 secures a gap between the outer peripheral surface of the synthetic resin cage 9a and the outer raceway 2 (see FIG. 2) provided on the inner peripheral surface of the outer race 3, and extends 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.

[0021]

In the case of the second example of the conventional structure as described above, the flow of the lubricating oil inside the roller bearing is made smooth, and damages such as early abrasion, peeling, seizure and galling occur. However, the durability and reliability of the roller bearing can be ensured, but the durability of the synthetic resin cage 9a is not always sufficient. That is, in the case of the second example of the above-mentioned conventional structure, as described above, each of the inner diameter side locking projections 13a, 1
The roller 6 is slightly displaced in the radial direction in each of the pockets 12b by bringing the 3a and a part of each outer diameter side locking projection 14a, 14a close to the rolling surface of the roller 6. I have to. In a state where the rollers 6, 6 which are rotatably held by the synthetic resin cage 9a are sandwiched between the outer race 2 and the inner race 4 (see FIG. 2), the synthetic resin cage 9a is held. Are hardly displaced in the radial direction. In other words, the synthetic resin cage 9a is held by a so-called rolling element guide.

On the other hand, during operation of the roller bearing, a plurality of rollers 6,
The orbital speeds of 6 are not exactly the same, but are slightly different. Then, the rollers 6, which are adjacent to each other in the circumferential direction with driving,
The distance (pitch) between the six is slightly increased or decreased. As a result,
Part of the rollers 6 is a pillar portion 11a of the synthetic resin cage 9a.
Is pressed in a direction opposite to the other rollers 6 in the circumferential direction,
A large stress may be generated at the connection between the pillar 11a and the rims 10a, 10a. When a large stress is repeatedly applied to the connecting portion with the use over a long period of time, damage such as a crack occurs in the connecting portion, and the durability of the roller bearing incorporating the synthetic resin cage 9a is impaired. Cause In view of such circumstances, the present invention prevents a large stress from being applied to the column from the rollers while taking advantage of the advantage of the second example of the above-described conventional structure that the lubricating oil flows smoothly. The present invention has been invented to sufficiently secure the durability of the synthetic resin cage.

[0023]

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 synthetic resin cage of the second example of the conventional structure described above.
A pair of rims spaced apart from each other in the axial direction,
A plurality of pillars which are intermittently arranged in the circumferential direction and have both ends connected to the inner surfaces of the pair of rims facing each other. Then, at least the portion excluding the inner-diameter end portion of the synthetic resin cage on the circumferential side surfaces of each of the pillar portions has a width of each pocket existing between the pillar portions 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 pockets is n, and the intersection angle between the imaginary straight line passing through the central part in the width direction of each pocket and extending in the diameter direction of the synthetic resin cage and both circumferential sides of the pillars. When the inclination angle of each of these side surfaces is θ, the inclination angle θ is restricted within the range of 0 degree <θ <(180 / n) degrees. In addition, a part of each of the pillar portions in the length direction on both circumferential sides of each of the pillar portions is provided to prevent the rollers that are rollably held in the respective pockets from falling out of the pockets. And a locking projection for preventing falling off. The inner peripheral surfaces of both ends in the axial direction of the synthetic resin cage are formed as conical concave surfaces that are inclined in such a manner that the inner diameter increases toward the axial end edge. And an outer ring having a cylindrical outer raceway on the inner peripheral surface, an inner racer having a cylindrical inner raceway on the outer peripheral surface, and a plurality of outer raceways having a cylindrical rolling surface contacting the outer raceway and the inner raceway. The plurality of rollers are rollably held in a state where the rollers are incorporated in a roller bearing having rollers.

In particular, in the synthetic resin cage for a roller bearing of the present invention, the rollers are held in the pockets so that the synthetic resin cage is guided on the inner peripheral surface of the outer ring. In a state where the inner ring is not provided, and in a state where these rollers are displaced toward the inner diameter side of the respective pockets by their own weight, the rolling surfaces of the respective rollers are located closer to the inner diameter side than the outer peripheral surface of the synthetic resin cage. .

[0025]

According to the cage made of synthetic resin for a roller bearing of the present invention constructed as described above, similarly to the second example of the conventional structure described above, pockets for holding the rollers in a freely rolling manner are provided inside. The lubricating oil can be efficiently circulated inside. 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.

Further, in the case of the synthetic resin cage for a roller bearing of the present invention, the positioning of the synthetic resin cage in the radial direction is performed by the outer ring. Therefore, a larger gap can be interposed between the rolling surface of each roller and the circumferential side surfaces of each column than in the case of the above-described second example of the conventional structure. For this reason, even if the revolution speed of each roller is slightly different, the frequency of each roller pressing the circumferential side surface of each column decreases, and as a result, the connecting portion between each column and the rim portion is reduced. Durability can be improved.

[0027]

FIG. 1 shows a first embodiment of the present invention.
An example is shown. The feature of the present invention is that the synthetic resin cage 9a is guided by the inner peripheral surface 19 of the outer ring 3 in order to reduce the stress applied to the column portions 11a due to the difference in the revolving speed of the rollers 6,6. (Prevents displacement in the radial direction). The structure and operation of the other parts are the same as those of the second example of the conventional structure shown in FIGS. Therefore, the illustration and description of the equivalent parts are omitted or simplified, and the following description will focus on the characteristic parts of the present invention.

The synthetic resin cage for a roller bearing of the present invention comprises:
In order to guide the synthetic resin cage 9a on the inner peripheral surface 19 of the outer ring 3, both inner and outer diameter locking projections formed on both circumferential sides of the column portions 11a, 11a. 13
a and 14a are regulated. That is, the interval between the inner and outer diameter side locking projections 13a, 14a is made wider than in the case of the above-described second example of the conventional structure, or in the circumferential direction of each of the pillars 11a, 11a. The amount of protrusion of both the inner diameter side and outer diameter side locking projections 13a and 14a from both side surfaces is reduced, or the width of each pocket 12b in the circumferential direction is increased. And
With this configuration, each of the rollers 6,
6 is displaced more in the diameter direction of the synthetic resin cage 9a than in the case of the above-described second example of the conventional structure.

More specifically, the rollers 6, 6 are held in the respective pockets 12b, and the inner ring 5 is provided inside the respective rollers 6, 6.
1 (see FIG. 2), the rollers 6, 6 are weighed by their own weights as shown in the upper part of FIG.
In a state of being displaced toward the inner diameter side of 2b, the rolling surface 7 of each roller 6 is higher than the outer peripheral surface 20 of the synthetic resin cage 9a.
It is arranged to be located on the inner diameter side by ΔR. Therefore,
In a state in which the synthetic resin cage 9a is incorporated in a roller bearing, the cage 9a is provided with the outer peripheral surfaces of the rims 10a and 10a and the outer ring 3 provided at both axial ends of the synthetic resin cage 9a. The inner ring 19 is guided (prevents displacement in the radial direction) by the inner ring 19 while the inner ring 19 is opposed to the inner ring 19.

However, the outer diameter of each of the rim portions 10a, 10a is set such that the rim portions 10a, 10a and the outer ring 3 are concentrically arranged with each other.
The thickness T ₂₁ between the outer surface and the inner peripheral surface of the outer ring 3 of 0a is regulated to a size that the outer diameter side annular gap 21 above 0.15mm is formed. Further, chamfered portions 22 are formed on the outer peripheral edges of the rim portions 10a, 10a, so that lubricating oil existing outside can easily flow into the outer diameter side annular gap 21. In addition, the chamfered portions 22 contribute to reducing the resistance of the outer-diameter annular gap 21 by reducing the axial dimension of the outer-diameter annular gap 21. Accordingly, the supply of the lubricating oil through the outer diameter side annular gap 21 is performed smoothly.

As described above, in the case of the cage made of synthetic resin for a roller bearing of the present invention, the positioning of this synthetic resin cage 9a in the radial direction is performed by the outer ring 3. Therefore, the rolling surfaces 7, 7 of the rollers 6, 6 and the pillars 1
A larger gap can be interposed between the circumferential side surfaces 1a and 11a than in the above-described second example of the conventional structure. For this reason, even when the revolving speed of each of the rollers 6, 6 is slightly different, each of the rollers 6, 6 is fixed to the column 1
The frequency of pressing the circumferential side surfaces of 1a and 11a decreases,
As a result, it is possible to improve the durability of the connection between the pillars 11a, 11a and the rims 10a, 10a.

The size of the roller bearing embodying the present invention is not particularly limited, as in the case of the above-described second example of the conventional structure.
The outer diameter of the outer ring 3 is about 20 to 120 mm, and the inner diameter of the inner ring 5 is 1
About 0 to 80 mm, width of outer ring 3 and inner ring 5 is 10 to 80 mm
The present invention can be preferably applied to a roller bearing having a certain degree. The type of lubricating oil used is not particularly limited, but the viscosity is 13 to 150 cs.
It can be preferably used for a roller bearing that constitutes a rotary support portion or the like that uses about t lubricating oil.

[0033]

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. Further, in the case of the cage made of synthetic resin for a roller bearing of the present invention, the durability of the cage itself is also improved, and the durability of the entire roller bearing including the cage made of synthetic resin can be sufficiently ensured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example of an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing one example of a roller bearing.

FIG. 3 is a sectional view showing a first example of a conventional synthetic resin cage for a roller bearing.

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 AA of FIG. 4;

FIG. 6 is a sectional view showing a second example of a conventional synthetic resin cage for a roller bearing.

FIG. 7 is a sectional view taken along line BB of FIG. 6;

FIG. 8 is a sectional view taken along the line CC in FIG.

FIG. 9 is a cross-sectional view showing a state in which rollers are incorporated, with a part thereof omitted.

FIG. 10 is a sectional view taken along line DD of FIG. 9;

FIG. 11 is a sectional view taken along the line EE in FIG.

[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 19 Inner peripheral surface 20 Outer peripheral surface 21 Outer diameter side annular gap 22 Chamfered portion

Claims (2)

[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. A plurality of pillars connected to inner surfaces of the pair of rims opposed to each other, and a portion excluding at least an inner-diameter end of the synthetic resin cage on both circumferential sides of each pillar; Is inclined in such a direction that the width of each pocket existing between the column portions adjacent in the circumferential direction becomes wider toward the outer side in the diameter direction of the synthetic resin cage, and the number of the respective pockets And n is the intersection angle between an imaginary straight line extending in the diametric direction of the synthetic resin cage passing through the central portion in the width direction of each pocket and the circumferential side surfaces of each pillar portion. When the inclination angle is θ, the inclination angle 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. An outer ring having a cylindrical outer raceway on the inner peripheral surface, an inner racer having a cylindrical inner raceway on the outer peripheral surface, and an outer circumferential surface contacting the outer raceway and the inner raceway. In a cage made of synthetic resin for a roller bearing, the plurality of rollers are rotatably held in a roller bearing having a plurality of rollers having cylindrical rolling surfaces. In order to guide the cage on the inner peripheral surface of the outer ring, each pocket In the state where the rollers are held and the inner ring is not provided, and the rollers are displaced toward the inner diameter side of the respective pockets by their own weight, the rolling surfaces of the rollers are higher than the outer peripheral surface of the synthetic resin cage. A synthetic resin cage for roller bearings, which is located on the inner diameter side. 2. An outer diameter of each of the rim portions is such that a thickness is defined between an outer peripheral surface of each of the rim portions and an 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 synthetic resin cage for a roller bearing according to claim 1, wherein the size is regulated to a size where an outer diameter side annular gap of 0.15 mm or more is formed.