JP2006153200A - Cage for roller bearing and roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cage for a roller bearing and the roller bearing, in which strength of corners of pockets can be increased and strength of the whole of the cage can be increased. <P>SOLUTION: In the cage 5 used for the thrust cylindrical roller bearing 1 equipped with a pair of raceway rings 20 and 30 confronting with each other, and a plurality of rollers 4 in a shape of a cylinder arranged so as to freely roll between the raceway rings 20 and 30, and having a plurality of the pockets 7 into which the rollers 4 are separately housed, the pocket 7 is provided with a protrusion 9 on a surface opposite at least one end surface of the roller 4 abutting with the end surface. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a roller bearing retainer and a roller bearing.

As a cage used for a roller bearing, a split type type machined cage is common.
For example, as shown in FIG. 9A, the split type machined cage is provided with one annular plate 102 and a plurality of column portions 106 provided on the side wall surface of the annular plate 102 at equal intervals in the circumferential direction. Are formed of a comb-shaped and annular cage main body 105, the other annular plate lid 103, and a spring pin 110 that couples the cage main body 105 and the lid 103. A substantially rectangular pocket 107 is partitioned by the annular plates 102 and 103 and the column portion 106.

Each of the pockets 107 has four corners. The rollers accommodated in the pockets 107 of this type of retainer 101 are, for example, as shown in FIG. In order to avoid this interference, the end of the roller 104 is processed into a spherical shape 104r.
On the other hand, as a cage used for a roller bearing, an integral type machined cage is also known (for example, see Patent Document 1).

The integrated machined cage is configured such that the cage body and the lid are integrally formed from a single member. For example, as shown in FIG. A pair of annular plates 112 and 113 are arranged on both sides in the radial direction, and a plurality of column portions 116 that connect the annular plates 112 and 113 to each other are arranged in the circumferential direction to define a pocket 117. In this example, a relief groove 140 having an arc surface with a radius of curvature Rc is formed at the corner of each pocket 117.
JP 2002-242938 A

By the way, in order to improve the strength of the cage, how to improve the strength of the corner of the pocket where stress concentration occurs is an important issue.
Here, for example, in Patent Document 1, the relief groove 140 is formed as a hollowed-out concave portion as shown in FIG. 10, and the curvature radius Rc of the relief groove 140 has a predetermined relationship with other related dimensions. However, since the hollow portion that is recessed in the corner portion is formed, only the base portion continuous to the corner portion is thinned and becomes a constricted shape. However, in order not to cause stress concentration, it is originally desirable that such a constricted shape is not formed. Therefore, in the technique described in Patent Document 1, although the stress concentration at the base portion of the column portion is alleviated, there is still room for improvement.

  Further, as a measure for alleviating the stress concentration at the corner, the corner is not formed with a relief groove such as a hollowed portion, but is simply formed with an arc surface, and its radius of curvature Rc. It is also possible to increase the size. However, if the radius of curvature Rc of the corner is increased excessively, interference with the chamfered portion at the end of the corner is caused. Therefore, the radius of curvature Rc at the corner cannot be increased so much, and the effect of alleviating stress concentration is often insufficient. Further, in this case, for example, in order to avoid interference with the end portion at the corner portion, a dedicated product such as a roller end portion processed into a spherical shape as shown in FIG. 9B is used. It becomes a factor of cost increase, such as the need to do.

  The present invention has been made paying attention to such a problem, and even when the corner portion is formed only by an arc surface without forming a relief groove composed of a recessed relief portion or the like, a standard specification roller is provided. An object of the present invention is to provide a roller bearing retainer and a roller bearing that can be incorporated and improve the strength of the corners of the pocket and can improve the strength of the entire retainer.

  In order to solve the above-mentioned problem, the invention described in claim 1 includes a pair of opposed raceways, and a plurality of cylindrical rollers arranged so as to roll between the raceways. In the cage having a plurality of pockets that are used for the roller bearing provided, and in which the rollers are accommodated, the pocket has a convex portion that comes into contact with the end surface on a surface facing at least one end surface of the roller. It is characterized by.

  The invention according to claim 2 is the roller bearing retainer according to claim 1, wherein the retainer is provided between a pair of opposed annular plates and the annular plates. And a plurality of pillars that partition the pocket by the annular plate, wherein the annular plate and the pillars are integrally formed from one member.

  Further, the invention according to claim 3 is a roller provided with a pair of bearing rings facing each other in the axial direction and a plurality of cylindrical rollers arranged so as to roll between the bearing rings. In a cage used in a bearing and having a plurality of pockets in which the rollers are individually accommodated, the cage is provided between a pair of annular plates opposed to each other in the radial direction and the annular plates. A plurality of pillars that divide the pocket by an annular plate, and the annular plate and the pillar part are integrally formed from a single member, and the pocket is a radial direction of the pair of annular plates. And the inner wall surface of the outer annular plate has a convex portion that makes a line or point contact with the end face of the roller.

Moreover, invention of Claim 4 is a cage for roller bearings as described in any one of Claims 1-3, Comprising: The said pocket is a corner by the side in which the said convex part is formed. It is characterized in that it is formed only by an arcuate surface without forming a relief groove composed of a recessed relief portion or the like.
The invention described in claim 5 is a roller bearing, and is characterized by including the roller bearing retainer described in any one of claims 1 to 4.

According to the present invention, the pocket in which the roller is accommodated is formed with a convex portion in contact with the end surface of the roller on the surface facing at least one end surface of the roller.
According to such a configuration, a gap can be provided between the end portion and the corner portion of the roller by the height of the convex portion in the axial direction of the roller. Thereby, the edge part and corner part of a roller do not interfere mutually. Therefore, it is possible to form an R shape lower than the height of the convex portion at the corner without providing a relief groove at the corner. Therefore, for example, even when the corner portion is formed only by an arc surface without forming a relief groove composed of a recessed relief portion, a standard specification roller can be incorporated, and the strength of the corner portion of the pocket is improved and the cage It is possible to provide a roller bearing cage and a roller bearing that can improve the overall strength.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.
FIG. 1 is a perspective view of a main part showing a thrust cylindrical roller bearing which is an embodiment of a roller bearing according to the present invention, FIG. 2 is a front view of the cage shown in FIG. 1, and FIG. 3 is a cage shown in FIG. FIG. 4 is a sectional view of the thrust cylindrical roller bearing shown in FIG.
As shown in FIG. 1, the thrust cylindrical roller bearing 1 includes a pair of race rings 20 and 30 that face each other in the axial direction X, and a circle that is a rolling element between the race rings 20 and 30. A plurality of columnar rollers 4 are arranged to freely roll. Each roller 4 is held at a certain interval in the circumferential direction by an annular cage 5 incorporated between the races 20 and 30.

The cage 5 is made of a metal such as a copper alloy, and is integrally formed as a flat plate having an annular shape from one member, as shown in FIGS. 2 and 3.
Specifically, the cage 5 includes a plurality of opposed annular plates 2 and 3 and a plurality of annular plates 2 and 3 that are provided between the annular plates 2 and 3 and define a substantially rectangular pocket 7. The column part 6 is comprised.

  The number of pockets 7 is the same as the number of rollers 4 provided at substantially equal intervals in the circumferential direction of the cage 5, and each pocket 7 holds the rollers 4 in the pockets 7 with the rollers 4 incorporated individually. It is formed in a size that allows rolling in the circumferential direction of the vessel 5. Further, relief grooves 40 having a predetermined radius of curvature and penetrating linearly in the width direction of the cage 5 are provided at the four corners of the substantially rectangular pocket 7.

  Further, as shown in FIGS. 2 and 3, the pocket 7 is formed with a convex portion 9 in line contact with one end face of the roller 4 at a substantially central portion in the circumferential direction of the pocket 7. Specifically, the convex portion 9 is continuously formed in the width direction of the annular plate 3 on the inner wall surface of the annular plate 3 facing the end surface facing the radially outer side of both end surfaces of the roller 4. The cross-sectional shape continuous in the width direction has a substantially semicircular arc shape convex toward the end face side of the roller 4. Thereby, a gap corresponding to the height of the convex portion 9 can be secured between the inner wall surface of the annular plate 3 and the end surface of the roller 4 facing the inner wall surface.

Further, as shown in FIGS. 3 and 4, a roller guide surface 8 is formed in the pocket 7 at a position facing the rolling surface 4 a of the roller 4.
The roller guide surface 8 is machined into an arc shape having the same contour as the design shape using a machining tool having a total shape along the rolling surface 4a, and the radius of curvature R thereof is the same as that of the rolling surface 4a. Slightly larger than the radius of curvature. In the roller guide surface 8, one end portion in the axial direction X is a protruding edge portion 8 a that prevents the roller 4 from dropping off from the pocket 7. Further, at the other end of the roller guide surface 8, there is a roller insertion portion 10 formed with a gap D slightly smaller than the diameter that is the outer diameter of the roller 4. Here, the roller insertion portion 10 is formed such that when the rolling contact surface 4a of the roller 4 is brought into contact and press-fitted, the interval D serving as the inner diameter thereof is elastically deformed to pass through the interval D. Therefore, when the roller 4 is assembled into the pocket 7, the roller 4 can be assembled by being press-fitted from the side where the roller insertion portion 10 is provided.

And this cage | basket 5 is comprised so that the direction which incorporates the roller 4 may become reverse direction (arrow X1 and X2) for every adjacent pocket 7. FIG.
That is, the pockets 7 adjacent to each other in the direction in which the rollers 4 are arranged are alternately formed for each pocket 7 adjacent in the direction of the axial direction X so that the overall shape of the pocket 7 is reversed. Further, assuming that the distance in the axial direction X between the rolling surface 4a of the roller 4 and the protruding edge portion 8a is A, the axial direction X between the roller insertion portion 10 and the boundary portion 10a between the guide surface 8 and the rolling surface 4a. When the distance at B is B, the radius of curvature R and the distance D of the roller guide surface 8 are set so as to always satisfy B> A.

Next, functions and effects of the cage 5 and the thrust cylindrical roller bearing 1 will be described.
According to the cage 5 described above, the pocket 7 in which the roller 4 is accommodated is provided with the convex portion 9 in line contact with the end surface of the roller 4 on the inner wall surface of the annular plate 3 facing one end surface of the roller 4. Yes.
According to such a configuration, a gap can be provided between the end portion and the corner portion of the roller 4 by the height of the convex portion 9 in the axial direction of the roller 4. Thereby, the edge part and corner part of the roller 4 do not interfere mutually.

  Therefore, according to the cage 5, even when the escape groove is provided as in the present embodiment, the degree of freedom of design is widened. For example, it is possible to provide a large curvature radius of the escape groove, and the thrust cylindrical roller bearing 1 However, when the roller 4 and the pocket 7 come into contact with each other during operation, the stress generated at the corners can be effectively relieved and the durability and impact resistance of the cage 5 can be improved. And the thrust cylindrical roller bearing 1 provided with the holder | retainer 5 can be provided.

Further, according to the cage 5, the cage is integrally formed from one member. Therefore, the durability and impact resistance of the cage 5 can be further improved. When assembling, it is not necessary to combine parts with the split-type cage, or to insert a spring pin after inserting the roller, or to perform caulking.
Further, in this cage 5, the roller guide surface 8 is processed by using a processing tool having a total shape along the rolling surface 4a. Therefore, the roller guide surface 8 can be easily processed so as to have the same contour as the design shape, and an optimum shape as the roller rolling surface can be obtained.

  Further, according to the cage 5, the pocket 7 has a roller insertion portion 10 having an inner diameter smaller than the outer diameter of the roller 4 and elastically deforming the inner diameter so that the roller 4 can be inserted into the pocket 7. Is formed. Therefore, at the time of assembly, the roller 4 can be easily assembled into the pocket 7 simply by being pushed in from the roller insertion portion 10. Therefore, the assembly man-hour can be reduced.

  In addition, the cage 5 is configured such that the direction in which the rollers 4 are incorporated into every adjacent pocket 7 is reversed. Here, when the thrust cylindrical roller bearing 1 is attached to the vertical axis, for example, as shown in FIG. 5, the cage 5 moves downward in the drawing due to gravity, and the protruding edge 8a and the rolling surface 4a come into contact with each other. It will be in the state. At this time, the above-described distance A (see FIG. 4) is zero. That is, the cage 5 is moved downward by a distance A. In the adjacent pocket 7, the distance B is shortened by the moving distance of the cage 5, but as described above, since B> A, B> 0 is always satisfied. That is, the rolling surface 4a is not in contact with the insertion portion 10. Therefore, the roller insertion portion 10 is not worn, and the interval D is maintained even after a long operation time. Therefore, the roller 4 does not fall out of the pocket 7, and the guide of the cage 5 can be maintained in a stable state. In addition, the protruding edge 8a and the rolling surface 4a have a very small contact angle, and therefore wear hardly occurs. Thus, according to this thrust cylindrical roller bearing 1, since it is comprised so that the direction which incorporates the roller 4 for every adjacent pocket 7 may become reverse, it can be used for a long time in the stable state. Even when the thrust cylindrical roller bearing 1 is attached to the horizontal axis, the insertion surface 10 does not contact the rolling surface 4a as in the case of the vertical axis. Therefore, a stable operation state can be maintained regardless of the direction in which the thrust cylindrical roller bearing 1 is attached.

As described above, according to the cage 5, since the pocket 7 is provided with the convex portion that is in line contact with one end surface of the roller 4, the strength of the corner portion of the pocket 7 is improved and the holding is performed. The strength of the entire vessel can be improved.
Further, since the cage 5 is an integrated type, the weight and material cost of the cage 5 can be reduced. Furthermore, the number of parts can be reduced, and the manufacturing cost can be reduced. Furthermore, since no pins are used, there is no problem due to pin looseness.

  And this thrust cylindrical roller bearing 1 does not need to ensure the space for providing a guide part like the case where it is a bearing ring guide, since the axial direction guide structure of the retainer 5 is a roller guide system. The allowable load is not reduced. Moreover, even if the thrust cylindrical roller bearing 1 is installed in any direction, the guide of the cage 5 can be maintained in a stable state over a long period of time.

The roller bearing retainer and the roller bearing according to the present invention are not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.
For example, in the above-described embodiment, a thrust cylindrical roller bearing has been described as an example. The present invention can be applied to any roller bearing provided with a plurality of rollers.

Moreover, although the said embodiment demonstrated the example which accommodates the roller 4 in each pocket 7 separately, it is not limited to this, The holding | maintenance for roller bearings which accommodates a some roller (for example, 2 pieces) in each pocket The present invention can be applied even to a container.
Moreover, in the said embodiment, although the pocket 7 in which the convex part 9 which line-contacts with the end surface of the roller 4 was formed demonstrated in the example by which the escape groove 40 was provided in the four corners, For example, as shown in a modification in FIG. 6, a radius-shaped arc having a corner lower than the height of the convex portion 9 without providing a relief groove with respect to the corner portion on the side where the convex portion 9 is formed. It can be formed with only the surface.

  Even in such a configuration, the height of the convex portion 9 in the axial direction of the roller (symbol H in FIG. 5B) is between the end of the roller 4 and the arcuate surface of the corner. A gap can be provided. Thereby, the edge part and corner part of a roller do not interfere mutually. Therefore, for example, in order to avoid interference with the end of the corner, it is not necessary to use a special product such as processing the end of the roller into a spherical shape as described above, and it is possible to incorporate a standard roller. The strength of the corners of the pocket 7 can be improved and the strength of the entire cage 5 can be improved. In the above-described embodiment, relief grooves are formed at the four corners because of machining using a machining tool having a total shape, but the present invention is not limited to this. For example, the relief grooves are formed by cutting with an end mill. It is possible. In that case, the degree of freedom of design is widened for the shape of the four corners and the shape of the convex portion 9.

For example, in the above-described embodiment, the pocket 7 has been described as an example in which the convex portion 9 that is in line contact with the end surface of the roller 4 is formed on the inner wall surface of the annular plate 3 that faces one end surface of the roller 4. The convex portion that contacts the end face of the roller is not limited to this.
For example, the contact state with the end face of the roller is not limited to line contact, and may be point contact. As an example of the convex portion that makes point contact, the convex portion 9 can be formed in a hemispherical shape as shown in a modification in FIG. Such hemispherical protrusions can be formed by, for example, press molding.
Further, even when the relief groove is formed in the corner, the shape of the relief groove can be appropriately modified. In the above embodiment, the relief groove has a predetermined radius of curvature and linearly extends in the width direction of the cage 5. Although the example in which the escape groove 40 is provided has been described, the escape groove 40 may be formed by being curved along the roller guide surface 8 as shown in FIG.

  Moreover, in the said embodiment, although the convex part 9 which contacts the end surface of the roller 4 demonstrated in the example formed only in one side, it is not limited to this, The surface which opposes a convex part to the both end surfaces of a roller You may provide in each of these. With such a configuration, it is possible to configure the column portion so that there is no constricted shape at the base portion continuous to the corner portion without forming relief grooves such as a hollow portion recessed in all the corner portions. Therefore, for example, in the case where the column portion has the same strength as that of the cage having the column portion having a conventional constricted shape, the column portion can be made thinner. Therefore, more rollers can be inserted, and the rated load of the roller bearing can be improved.

Moreover, in the said embodiment, although the cage | basket 5 demonstrated with the metal example which consists of copper alloys etc., the material of a cage | basket is not limited to this, For example, a cage | basket is formed from a synthetic resin material. Also good.
Moreover, in the said embodiment, although the cage | basket 5 which has the convex part 9 which contacts the end surface of the roller 4 demonstrated to the example the integrated type | mold machined cage currently formed integrally from one member, to this, It is not limited, The structure which has a convex part which contacts the end surface of a roller is applicable to a split-type machined cage.
Moreover, in the said embodiment, although the pocket 7 of the holder | retainer 5 is formed so that the direction of the roller insertion part 10 may become reverse for every adjacent pocket 7, it is not limited to this, A roller insertion part The 10 directions may be reversed in a desired arrangement such as every two or every three.

It is a principal part perspective view which shows the thrust cylindrical roller bearing which is one Embodiment of the roller bearing which concerns on this invention. It is a front view of the holder | retainer shown in FIG. It is a principal part perspective view of the holder | retainer shown in FIG. It is sectional drawing of the thrust cylindrical roller bearing shown in FIG. It is sectional drawing which shows the state which used the thrust cylindrical roller bearing shown in FIG. 1 for the vertical axis | shaft. It is a figure explaining the modification of the holder | retainer which concerns on this invention, the figure (a) is explanatory drawing corresponded to the principal part perspective view of the holder shown in FIG. 2, and the figure (b) is the holder FIG. 2 is a front view of FIG. It is a figure explaining the modification of the holder | retainer which concerns on this invention, the same figure (a) is explanatory drawing equivalent to the principal part perspective view of the holder | retainer shown in FIG. 2, and the same figure (b) is the same figure. It is the code | symbol C and D arrow figure in figure (a), and has expanded and shown the convex part which concerns on this invention. It is a figure explaining the modification of the holder | retainer which concerns on this invention, and the figure is demonstrated in the figure corresponded to the principal part perspective view of the holder | retainer shown in FIG. It is a figure explaining an example of the conventional division type machined cage. It is a figure explaining an example of the conventional one-piece machined cage.

Explanation of symbols

1 Thrust cylindrical roller bearing (roller bearing)
2, 3 Annular plate 4 Roller 5 Cage 6 Column 7 Pocket 8 Guide surface 9 Convex 10 Roller insertion part 20, 30 Race ring 40 Relief groove

Claims (5)

A plurality of pockets that are used in a roller bearing including a pair of bearing rings facing each other and a plurality of cylindrical rollers that are rotatably disposed between the bearing rings, and in which the rollers are accommodated. In a cage having
The roller bearing retainer according to claim 1, wherein the pocket has a convex portion in contact with the end surface on a surface facing at least one end surface of the roller.   The cage includes a pair of opposed annular plates, and a plurality of pillars provided between the annular plates and defining the pockets by the annular plates, the annular plates and the pillars The roller bearing retainer according to claim 1, wherein the portion is integrally formed from one member. Used in a roller bearing comprising a pair of bearing rings facing each other in the axial direction and a plurality of cylindrical rollers arranged so as to be able to roll between the bearing rings. The rollers are individually accommodated. In a cage having a plurality of pockets,
The cage includes a pair of annular plates opposed to each other in a radial direction, and a plurality of pillars provided between the annular plates and defining the pockets by the annular plates, and the annular plate and The pillar part is integrally formed from one member,
The said pocket has a convex part which carries out a line or a point contact with the end surface of the said roller on the inner wall surface of the annular plate outside a radial direction among a pair of said annular plates.   The pocket has a corner formed on the side where the convex portion is formed, and is formed only by an arc surface without forming a relief groove formed of a recessed relief portion or the like. A cage for roller bearings according to any one of the above.   A roller bearing comprising the roller bearing retainer according to any one of claims 1 to 4.

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