JPH10281165A - Cage for rolling bearing - Google Patents

Abstract

(57) [Summary] [Object] To provide a cage for a rolling bearing capable of increasing the load capacity of the bearing while suppressing the size of the bearing. SOLUTION: Protrusions 1d, 1 of cracked ends 1b, 1c of a cage.
Since the window 1a 'for accommodating the roller 2 is formed when e is engaged, the interval between the windows 1a (1a') arranged over the entire circumference can be set small. , Thereby increasing the number of rollers 2 in the bearing,
The load capacity of the bearing can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cage for a rolling bearing, for example, as used in an automobile transmission.

[0002]

2. Description of the Related Art In various machines, rolling bearings are used to rotatably support a rotating shaft. Rolling bearings are usually provided with a cage for keeping the rolling elements separated from each other so that the rolling elements rolling between the inner and outer rings do not come into contact with each other.

[0003] One type of such a cage is a so-called split cage. FIG. 4 is a perspective view showing a part of a split type cage for a roller bearing according to the prior art. Such a conventional split-type cage is formed of a resin plate that is rounded into a cylindrical shape.

In FIG. 4, a cylindrical main body 101 forms rectangular windows 101a at equal intervals along the circumferential direction.
A roller (not shown) is arranged in the window 101a. A part of the main body 101 is cut (split) in the axial direction and separated, and one of the separated ends has a protrusion 10.
1b, and a concave portion 101c is formed at the other separated end.

Here, in terms of the original function of the retainer, it is not necessary to form a crack in the main body 101, and in view of a decrease in rigidity of the main body 101 due to separation, it is better not to provide a crack. It can be said that it is good.

However, when the retainer can be expanded when it is incorporated into the inner ring of the bearing, it may be easy to incorporate the retainer. In such a case, as shown in FIG. 4, a split type retainer provided with a crack in a part of the main body is often used. After the cage is assembled into the bearing, the main body 10
1 returns to the original cylindrical shape due to the elasticity of the
By engaging the recesses 1b with the recesses 101c, the displacement of the cracked portions in the axial direction is prevented.

[0007]

The load capacity of a rolling bearing is generally determined by the size and number of rolling elements such as rollers disposed between the inner and outer rings. If the size of the rolling elements is constant, the load capacity of the bearing increases as the number of rolling elements increases. Note that the load applied to the bearing is supported not by all the rolling elements, but only by the rolling elements on the side (load side) where the inner and outer rings approach when receiving the load.

On the other hand, apart from the number of rolling elements, the spacing between the rolling elements is also closely related to the load capacity of the bearing. That is, if a plurality of rolling elements are arranged at equal intervals, the load capacity is substantially constant regardless of the position of the rolling elements, but when the rolling elements are separated or approached, When the separated rolling element comes to the load side, the load capacity of the bearing decreases. Therefore, in such a case, if a high load is applied, there is a possibility that the rolling elements may be galled.

However, as shown in FIG. 4, if the projection 101b and the recess 101c are formed in the broken portion of the retainer body 101, a window 101c for accommodating the rolling element is provided near the broken portion. It cannot be formed. Therefore, in the split type cage of the related art, the window 101a is formed so as to sandwich the cracked portion, and the window 101a is formed over the entire circumference at an equal interval to the window 101a.

As described above, the minimum value of the interval between the adjacent window portions 101a is mainly determined by the size of the convex portion 101b and the concave portion 101c.
It is difficult to further reduce the interval without changing the size of 01c. Therefore, since the number of the window portions 101a, that is, the number of rolling elements cannot be increased to a certain value or more, the load capacity of the bearing is also limited.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a cage for a rolling bearing which can increase the load capacity of the bearing while suppressing the size of the bearing.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, a cage for a rolling bearing according to the present invention is a cage for a rolling bearing formed by separating at least one portion on a circumference. Once, one of the opposing ends is once engaged with the other end, the end has a shape that prohibits at least the relative movement between the ends in the axial direction,
Further, by engaging the ends, a window for accommodating the rolling elements of the rolling bearing is formed.

[0013]

According to the rolling bearing retainer of the present invention, since the end portion is engaged, a window for accommodating the rolling element of the rolling bearing is formed.
Since the interval between the windows arranged over the entire circumference can be set small, and the number of rolling elements in the bearing can be increased, the load capacity of the bearing can be increased.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a retainer according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG.
(A) is the figure which cut a part of cage for roller bearings concerning a 1st embodiment by this invention, and looked at at right angles to an axis. FIG. 1B is an enlarged view of the IB section of FIG. 1A. In FIG. 1A, a cylindrical main body 1 is made of resin, and has rectangular windows 1a (1a ') formed at equal intervals along a circumferential direction. A roller 2 (only one is indicated by a dotted line in the window 1a ') is arranged in such a window.

A part of the main body 1 is cut (split) in the axial direction, thereby forming an upper crack end 1b and a lower crack end 1c. Two projections 1d extending upward are formed at both ends in the axial direction of the lower cracked end 1c. On the other hand, two protrusions 1e are formed near the two ends in the axial direction of the upper cracked end 1b and are adjacent to the inside of the protrusion 1d and extend downward. Hereinafter, the protrusions 1d and 1e will be described in detail. However, since the protrusions 1d and 1e on both sides are respectively common to each other and only the arrangement is reversed, only the protrusions 1d and 1e on one side are used. This will be described in detail below.

In FIG. 1B, the projection 1d has a step 1f formed at the tip thereof so as to protrude inward in the axial direction.
On the other hand, the projection 1e has a step 1g formed at the tip thereof, which protrudes outward in the axial direction. The steps 1f and 1g are respectively
A slope 1h, 1i extending obliquely from a tip of the projection 1d, 1e toward the adjacent projection, and an engagement surface 1j, 1k extending axially from the slope 1h, 1i at the center of the projection 1d, 1e. Having. In FIG. 1A, a space substantially equal to the entire length of the roller 2 is secured between the pair of protrusions 1e, and the circumferential length of the protrusion 1e is substantially equal to the outer diameter of the roller 2. Therefore, the projections 1d, 1e
Are engaged between the protrusions 1e and the crack ends 1
A window 1a 'for accommodating the roller 2 is formed between b and 1c.

Next, the manner of assembling the cage to the bearing in the present embodiment will be described. The projections 1d and 1e are in a disengaged state, and the roller 2 is already fitted in the window 1a. When the cage in this state is arranged around the inner ring (not shown) and the cracked ends 1b and 1c are brought closer to each other, the slopes 1h and 1i of the projections 1d and 1e first come into contact with each other. When the cracked ends 1b and 1c are further approached, the protrusion 1
d and 1e are separated from each other. At the stage where the slopes 1h and 1i have passed each other, the projections 1d and 1e return to the original shape by the elastic force, and the engagement surfaces 1j and 1k are brought into a state of facing each other. In this state, the roller 2 is fitted into the window 1a ', and the outer ring (not shown) is fitted around the roller 2 to complete the mounting of the bearing.

Note that, as shown in FIG.
The protrusions 1d and 1e are dimensioned so that a predetermined clearance δ is formed between the tips of d and 1e and the crack ends 1c and 1b, so that the outer ring is fitted into the retainer attached to the inner ring. In so doing, the cage reduces the circumference, thereby making it easier to fit the outer ring.

As is clear from the above, the slopes 1h, 1i
, The projections 1d and 1f can be easily engaged, but once engaged, the cracked ends 1b and 1c are not easily separated by the action of the engagement surfaces 1j and 1k. . Therefore, even when a relatively large force is received from the roller 2 during the operation of the bearing, the retainer according to the present embodiment is not easily deformed.

According to this embodiment, the opposing crack ends 1
Since the windows 1a 'for accommodating the rollers 2 can be formed between b and 1c, the distance between the windows to be arranged at equal intervals can be reduced (theoretically, 1/2), whereby the rollers can be formed. And the load capacity of a bearing using such a cage can be greatly increased.

Next, a retainer according to a second embodiment of the present invention will be described in detail with reference to the drawings. FIG.
(A) is the figure which cut a part of cage for roller bearings concerning a 2nd embodiment by this invention, and looked at at right angles to an axis. FIG. 2B is an enlarged view of the portion IIB in FIG. FIG. 2C is a view of the retainer of FIG. 2A taken along a line IIC-IIC and viewed in a direction indicated by an arrow.

In FIG. 2A, a cylindrical main body 11 is made of resin and has rectangular windows 11a (11a ') formed at equal intervals along the circumferential direction. Rollers 2 (only one is indicated by a dotted line in the window 11a ') are arranged in the window.

Also in the second embodiment, a part of the main body 11 is cut (split) in the axial direction, thereby forming an upper crack end 11b and a lower crack end 11c. . The lower crack end 11c has four protrusions 11d, 1
1d 'is formed. As is clear from FIGS. 2B and 2C, the protrusions 11d and 11d 'have a thickness of less than half the thickness of the main body 11, and the protrusions 11d on both sides in the axial direction.
Extends along the outer periphery of the main body 11, and the protrusion 11 d ′ disposed inside the protrusion 11 d extends along the inner periphery of the main body 11.

On the other hand, the upper cracked end 11b has four protrusions 11e, 11e 'extending downward adjacent to the protrusions 11d, 11d' in the vicinity of both ends in the axial direction.
Are formed. As is clear from FIGS. 2B and 2C, the protrusions 11e and 11e 'also have a thickness of less than half the thickness of the main body 11, and the protrusions 11e on both sides in the axial direction are inside the main body 11. The protrusion 11 e ′ extending along the circumference and disposed inside the protrusion 11 e extends along the outer circumference of the main body 11. That is, each protrusion 11d, 11d ', 11e, 1
1e 'are formed alternately.

In FIG. 2, two pairs of projections 11d 'and 11d'
A space approximately equal to the entire length of the roller 2 is secured between e ′, and the circumferential length of the projections 11 d ′, 11 e ′ is approximately equal to the outer diameter of the roller 2. Therefore, protrusion 1
When 1d, 11d ', 11e, 11e' are engaged,
Between the protrusions 11d ', 11e' and the cracked end 11
A window 11a 'for accommodating the roller 2 is formed between b and 11c.

As in the first embodiment, each projection 11
Each of d, 11d ', 11e, and 11e' forms a step at the tip. The difference from the first embodiment is that each step is oriented in the radial direction. That is, when assembling the cage according to the second embodiment, the cracked end 11b
And 11c approach each other, the projections 11d, 11d ',
11e and 11e 'are deformed in directions separated from each other in the radial direction, and thereafter, return to their original shapes, thereby completing the engagement.

According to the present embodiment, similarly to the first embodiment described above, the window 11a 'for accommodating the roller 2 can be formed between the opposing cracked ends 11b and 11c, so that the windows 11a' are equally spaced. Reduce the spacing between windows to be placed (1/2 in theory)
2), thereby doubling the number of rollers and greatly increasing the load capacity of a bearing using such a retainer.

On the other hand, in the first embodiment described above, when a radial force is applied to one of the cracked ends,
According to the second embodiment, it is possible to oppose not only an axial force but also a radial force to the cracked ends 11b and 11c.
A cage with higher rigidity can be provided.

Next, a retainer according to a third embodiment of the present invention will be described in detail with reference to the drawings. FIG.
FIG. 3A is a perspective view of a broken end 21b in a roller bearing cage according to a third embodiment of the present invention, and FIG. 3B is opposed to the broken end 21b of the cage. It is a perspective view of crack end 21c.

In FIG. 3 (a), a crack 21b
A prismatic base 21x is formed at both ends in the axial direction, and four protrusions 21e and 21e 'extending in the circumferential direction from the end surface of the prismatic base 21x are formed. As is clear from FIG. 3A, the protrusions 21e and 21e 'have a rectangular parallelepiped shape, and have a thickness of half the thickness of the main body 21, and the protrusions 21e on both sides in the axial direction extend along the outer periphery of the main body 21. The protrusion 21e ′ extending to the inner side of the protrusion 21e
Extends along the inner periphery of

On the other hand, in FIG.
Has a prismatic base 21 having the same shape as the prismatic base 21x.
y are formed, and four concave portions 21d and 21d 'are formed on the end surface of the prismatic base 21y so as to correspond to the protrusions 21e and 21e'. In addition, the prism-shaped base portions 21x and 21y protrude by a distance substantially half the outer diameter of a roller (not shown). In addition, crack ends 21b, 21c
At the upper and lower edges at the center of the center part, a claw part 21m for preventing the incorporated roller from falling off is formed.

Further, the maximum distance between the projections 21e is l ₁ , the maximum distance between the recesses 21d is l ₁ ', the minimum distance between the projections 21e' is l ₂ , the minimum distance between the recesses 21d 'is l ₂ ', and the projections are 2
If the width of 1e is l ₃ and the width of the recess 21d is l ₃ ′, the following relationship is established. l ₁ > l ₁ 'l ₂ <l ₂ ' l ₃ <l ₃ '

According to the present embodiment, the prismatic base 21
By causing x and 21y to face each other, crack ends 21b, 2
Since the window for accommodating the rollers can be formed between 1c, the distance between the windows can be reduced (in theory, to １ ／) as in the above-described embodiment.

Further, unlike the first and second embodiments, the third embodiment has no stepped portion. However, since the protrusions 21e and 21e 'and the recesses 21d and 21d' have the above-described dimensional relationship, the protrusions 21e and 21d '
By inserting e 'into the recesses 21d, 21d', the protrusions 21e, 21e 'undergo elastic deformation. Based on such elastic deformation, the projections 21e, 21
The escape of e 'is prevented. On the other hand, by inserting such projections into the recesses, similarly to the second embodiment, even when a force is applied not only in the axial direction but also in the radial direction to the cracked ends 21b and 21c, the cracked ends 21b and 21c can be opposed to each other. Can be provided. The protrusion 2
Since the tips of 1e and 21e 'are chamfered, insertion into the recesses 21d and 21d' is easy.

The present invention has been described with reference to the embodiments. However, the present invention should not be construed as being limited to the above embodiments, and it is needless to say that modifications and improvements can be made as appropriate. is there. For example, in the embodiments, the roller bearing retainer has been described as an example. However, the present invention is not limited to this, and is applicable to, for example, a ball bearing retainer.

[0036]

According to the cage for a rolling bearing of the present invention, the window for accommodating the rolling element of the rolling bearing is formed by engaging the broken end. The distance between the windows arranged over the entire circumference can be set small, whereby the number of rolling elements in the bearing can be increased, so that the load capacity of the bearing can be increased.

[Brief description of the drawings]

FIG. 1 is a view showing a cage for a roller bearing according to a first embodiment of the present invention, and FIG. 1 (a) is a view in which a part of the cage is cut / cut and viewed in a direction perpendicular to an axis. FIG. 1B is an enlarged view showing an IB portion in FIG. 1A.

FIG. 2 is a view showing a cage for a roller bearing according to a second embodiment of the present invention; FIG. 2 (a) shows a state where a part of the cage is cut and viewed in a direction perpendicular to an axis; FIG.
FIG. 2B is an enlarged view of the IIB portion of FIG. 1A, and FIG. 2C is a diagram showing the holder of FIG.
It is the figure cut | disconnected by IIC line and seen in the arrow direction.

FIG. 3 is a view showing a roller bearing retainer according to a third embodiment of the present invention, and FIG. 3 (a) is a perspective view of a broken end 21b of the retainer, and FIG. () Is a perspective view of a cracked end 21c facing the cracked end 21b of the cage.

FIG. 4 is a perspective view of a conventional split-type cage.

[Explanation of symbols]

 1, 11, 21 {Main body 1a, 1a ', 11a, 11a', 21a {Window portion 1b, 11b, 21b} Upper crack end 1c, 11c, 21c Lower crack end 1d, 11d, 11d ' {Projection 1e, 11e, 11e ', 21e, 21e'} Projection 21d, 21d '>> Recess

Claims (1)

[Claims] Claims 1. A cage for a rolling bearing formed by separating at least one portion on a circumference, wherein at least one of opposed ends is once engaged with the other end, at least an axis. The end has a shape that prohibits relative movement between the ends in the direction, and a window for accommodating the rolling element of the rolling bearing is formed by further engaging the end. Cage for rolling bearing.