JP2020046061A - Holder for conical roller bearing and conical roller bearing - Google Patents

Abstract

To provide a holder for a conical roller bearing that dispenses with the bottom expansion or caulking of a holder, and can secure dimension accuracy and also suppress cost increase.SOLUTION: A holder 9 for a conical roller bearing has: a holder body 11 that has pocket parts 13 for holding a cylindrical roller 8, pillar parts 14 arranged between adjacent pocket parts 13, 13, and annular rim parts 15 connecting the pillar parts 14 with each other, and in which at least at one location in the circumferential direction, a cut part 16 is formed over the entirety in the axial direction; and an annular holding ring 12 that is provided on the outer diameter surface of the rim part 15, for holding the cut parts 16 in a state where the end parts of the cut parts are abutted with each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cage for holding a tapered roller incorporated between an outer ring and an inner ring, and a tapered roller bearing employing the cage.

  In a tapered roller bearing in which a plurality of tapered rollers are incorporated between an inner ring raceway formed on the outer peripheral surface of the inner ring and an outer ring raceway formed on the inner peripheral surface of the outer ring, and the plurality of tapered rollers are held by a retainer, A large collar is provided at the large diameter end of the inner raceway, and a small collar is provided at the small diameter end of the inner raceway. The large collar receives a thrust load, and the small collar prevents the tapered rollers from falling off.

  In a general tapered roller bearing, the small collar is provided integrally with the inner ring, so when the tapered roller held by the retainer is assembled to the inner ring raceway, the tapered roller interferes with the small collar, and Cannot be assembled.

  Therefore, after increasing the diameter of the small-diameter end side of the retainer, that is, performing so-called bottom enlargement, assembling the tapered rollers held by the retainer to the inner ring raceway, and after assembling, expanding the bottom of the retainer using a jig. By crimping the reduced portion, the shape of the retainer is returned to the original state.

  However, in assembling the tapered roller bearing as described above, when the diameter of the cage is reduced by expanding the bottom of the cage or caulking, the shape of the cage collapses, and dimensional accuracy and strength are reduced. At times, skew may occur in the tapered rollers, and a large load may be applied to the retainer. In addition, there is a possibility that the holding state of the tapered rollers may be disturbed due to insufficient caulking of the retainer or forgetting to caulk.

  In order to solve this problem, there have been proposed some retainers which do not require the bottom expansion and the caulking.

  For example, in a tapered roller bearing disclosed in Patent Document 1, a plurality of axial grooves for roller assembly are formed in a small flange of a cone (inner ring). Then, each tapered roller held by the retainer is incorporated into the cone by passing through the axial groove.

  Further, in the tapered roller bearing disclosed in Patent Document 2, a spring ring is fitted on the small diameter side of the inner ring transfer surface (inner ring raceway). The spring ring bends toward the inner diameter side by contact with the rollers, so that the rollers can be easily inserted. In addition, the deflection of the spring ring returns to its original position after the roller is inserted, thereby preventing the roller from falling off.

  Further, in the tapered roller bearing disclosed in Patent Document 3, the large collar is formed integrally with the large diameter end of the inner ring, while the small collar formed at the small diameter end is a small collar of another member. After the tapered rollers held by the retainer are provided on the raceway surface of the inner ring, the small collar is attached to the small-diameter end side of the inner ring.

In the tapered roller bearing shown in Patent Document 4, a bore diameter D _e when pressed against the pockets of the cage on the outer circumferential side roller, the end face circumscribing circle diameter D ₁ and raceway surface circumscribing the small collar dimensional relationship between the circle diameter _{D 2} is set to be _{D 1 <D e <D 2} . By doing so, when the rollers are provided on the inner ring, the abutment between the rollers and the small collar of the inner ring allows the retainer to be elastically deformed to the outer diameter side, thereby enabling the rollers to be inserted into the inner ring. After the insertion of the rollers, the retainer elastically returns to prevent the assembly at the retainer from coming off the inner race.

  Further, in the tapered roller bearing disclosed in Patent Document 5, the ratio of the section modulus of the small-diameter side ring to the section modulus of the large-diameter side ring of the retainer is in the range of 0.5 to 1.5. . With this configuration, when the cage holding the tapered rollers is inserted into the inner ring, the small flange of the inner ring and the rolling surface of the tapered rollers come into contact with each other, and the cage bulges radially outward due to elastic deformation. The inner ring can be inserted into the inner diameter side.

JP-A-2004-132404 JP 2011-69426 A JP 2012-219822 A JP-A-2001-208054 JP 2014-159872 A

  In the configuration according to Patent Document 1, the number of axial grooves corresponding to the number of tapered rollers must be formed in the small flange of the inner ring. Further, in the configurations according to Patent Documents 2 and 3, the small ring of the inner ring is formed of a separate member, and a circumferential groove for fixing the small ring to the outer diameter surface of the inner ring must be formed. For this reason, the configurations shown in Patent Literatures 1 to 3 have a problem in that the cost is increased due to processing costs and the like.

  Further, in the configurations according to Patent Documents 4 and 5, since the retainer is elastically deformed by the contact between the small flange formed on the inner ring and the tapered roller, the inclination of the inner ring raceway into which the inner ring can be inserted by this elastic deformation. There are often restrictions on angles, roller sizes, and the like. Further, since the cage is forcibly elastically deformed once, it is not preferable in terms of maintaining the strength of the cage.

  Therefore, an object of the present invention is to provide a cage for a tapered roller bearing capable of securing the dimensional accuracy of the cage and suppressing the increase in cost by eliminating the need for expanding the bottom and caulking of the cage.

  In order to solve this problem, in the present invention, a pocket portion holding a tapered roller, a pillar portion disposed between the adjacent pocket portions, an annular rim portion connecting the pillar portions, An outer diameter surface of the rim portion, wherein a retainer body having an axially entire cut portion formed at at least one location in a circumferential direction and an end portion of the cut portion are held in abutted condition. And a tapered roller bearing retainer having an annular retaining ring.

  In this way, the annular retainer body naturally expands radially outward due to the release of stress accompanying the cutting. By expanding the retainer body in this manner, the inner ring can be smoothly inserted into the retainer holding the tapered rollers without performing the bottom expanding step as in the related art. The expanded retainer can be smoothly returned to an annular shape by providing an annular holding ring. Moreover, since the outer diameter surface of the retainer is uniformly retained by the retaining ring over the entire circumferential direction, the rigidity of the retainer can be ensured. Further, since only a part of the retainer main body is cut to provide an annular retaining ring, processing costs and material costs are unlikely to cause cost increases.

  In the above configuration, it is preferable that the outer diameter surface has a cylindrical surface having a constant outer diameter in the axial direction.

  With this configuration, the retaining ring can be smoothly provided on the outer diameter surface of the retainer main body in the axial direction with the ends of the cut portions formed on the retainer main body abutting on each other.

  In each of the above configurations, the cut portion may be formed at both axial ends of the pocket portion, or the cut portion may be formed at the pillar portion.

  With this configuration, it is possible to form a cut portion for expanding the retainer body radially outward without affecting the rolling of the tapered rollers held by the retainer body.

  In each of the above configurations, the rim portion may be formed at both axial end portions of the retainer main body, and the holding ring may be provided at each of the rim portions.

  In this way, the retainer body, which is formed by closing the cut portion and having an annular shape, is reliably prevented from spreading outward in the radial direction, and the tapered rollers can be stably rolled.

  The tapered roller bearing retainer according to each of the above configurations has an inner ring in which a tapered inner raceway is formed on an outer peripheral surface, a large flange is formed on a large diameter side of the inner raceway, and a small flange is formed on a small diameter side, An outer ring, which is disposed coaxially with the inner ring and has an outer peripheral surface formed with a tapered outer raceway inclined in the same direction facing the inner raceway on the inner peripheral surface, and is incorporated between the inner raceway and the outer raceway. The present invention can be applied to a tapered roller bearing having a plurality of tapered rollers and a tapered roller bearing retainer for holding the plurality of tapered rollers at predetermined intervals in a circumferential direction.

  In this way, the tapered roller bearing can be easily assembled, and the increase in manufacturing cost can be prevented.

  A tapered roller bearing retainer and a tapered roller bearing according to the present invention are, as described above, a retainer body having a cut portion formed in at least a part of a circumferential direction, and a retaining ring that retains the retainer body in an annular shape. It was adopted. For this reason, it is possible to provide a cage for a tapered roller bearing capable of securing the dimensional accuracy of the cage and suppressing the increase in cost without requiring the base to be widened or crimped.

1 is a cross-sectional view showing an embodiment of a tapered roller bearing according to the present invention. Partial cutaway front view of the tapered roller bearing shown in FIG. 1 viewed from its small brim side. 1 is a perspective view showing a tapered roller bearing retainer according to the present invention, in which (a) is a state before cutting, (b) is a state cut along line bb in (a), and (c) is ( State cut along line cc in a) Sectional view showing the bearing before assembly Front view along the line VV in FIG. Front view of the main part showing a state where the ends of the cutting part are butted together Sectional view showing the state before press-fitting the retaining ring Sectional view showing the state after press-fitting the retaining ring

  One embodiment of a tapered roller bearing according to the present invention is shown in FIGS. The tapered roller bearing 1 has an inner ring raceway 2 having a tapered inner raceway 2 formed on the outer peripheral surface thereof, a large collar 3 formed on the large diameter side of the inner raceway race 2, and a small collar 4 formed on the small diameter side. And an outer ring 7 having a tapered outer ring track 6 formed coaxially with the inner ring surface 5 and inclined in the same direction as the inner ring track 2 facing the inner ring track 2, and incorporated between the inner ring track 2 and the outer ring track 6. And a plurality of tapered rollers 8 and a tapered roller bearing retainer 9 (hereinafter simply referred to as a retainer) that holds the plurality of tapered rollers 8 at predetermined intervals in a circumferential direction.

  A tapered inclined surface 10 that is inclined in the same direction as the inner raceway 2 is formed on the outer peripheral surface of the small flange 4 of the inner race 5.

  The retainer 9 has a retainer body 11 and a retaining ring 12. The retainer main body 11 is formed by pressing a steel plate into an annular shape, and is formed between a pocket portion 13 (see FIG. 3A and the like) holding the tapered rollers 8 and adjacent pocket portions 13. It has a pillar portion 14 arranged and an annular rim portion 15 (a large-diameter rim portion 15a and a small-diameter rim portion 15b to be described later) connecting the pillar portions 14 to each other.

  The column portion 14 is inclined in the same direction as the inner raceway 2 and the outer raceway 6 with respect to the rotation axis direction of the tapered roller bearing 1. One end (large brim 3 side) of the pillar 14 is connected to a large-diameter rim 15a, and the other end (small brim 4) is connected to a small-diameter rim 15b having a smaller diameter than the large-diameter rim 15a. The outer diameter surfaces of the large-diameter rim portion 15a and the small-diameter rim portion 15b are cylindrical surfaces having a constant outer diameter in the axial direction.

  At one location in the circumferential direction of the retainer body 11, a cut portion 16 is formed over the entire retainer body 11 in the axial direction (from the large diameter side to the small diameter side of the retainer body 11). In the configuration shown in FIG. 1, as shown in FIGS. 3A and 3B, the cut portions 16 are formed at both axial ends of the pocket portion 13 (the large-diameter rim portion 15a and the small-diameter rim portion 15b). I have.

  By forming the cut portion 16, the residual stress accompanying the processing step of the retainer main body 11 is released, and the retainer main body 11 naturally spreads outward in the radial direction. Then, in the assembly completed state of the tapered roller bearing 1, as shown in FIG. 2, the ends of the cut portion 16 abut against each other in the circumferential direction, and the retainer main body 11 is formed in an annular shape. The cut portion 16 can be formed in the pillar portion 14 as shown in FIG.

  The holding ring 12 is an annular member for holding the cut portions 16 formed on the retainer main body 11 in a state where the ends thereof abut against each other. In this embodiment, two holding rings 12 (large-diameter ring 12a and small-diameter ring 12b) having different diameters are used. The inner diameter of the large-diameter ring 12a is substantially the same as the outer diameter of the large-diameter rim 15a when the ends of the cut portions 16 formed in the retainer main body 11 are abutted, and the inner diameter of the small-diameter ring 12b is The outer diameter of the small-diameter rim portion 15b is substantially the same as that of the small-diameter rim portion 15b in a state where the ends of the cut portions 16 formed on the container body 11 are abutted. Thus, the large-diameter ring 12a is attached to the outer diameter surface of the large-diameter rim portion 15a and the small-diameter ring is attached to the outer diameter surface of the small-diameter rim portion 15b in a state where the ends of the cut portions 16 formed on the retainer main body 11 abut. By press-fitting the respective 12b, the retainer main body 11 is held in a circumferentially continuous annular shape.

  An assembly of the tapered roller bearing 1 according to the present invention will be described.

  As shown in FIGS. 4 and 5, with the tapered rollers 8 set in the cage 9, the inner ring 5 is coaxially inserted from the large diameter side of the cage body 11. At this time, the retainer main body 11 is naturally in a state of being expanded radially outward, and has a diameter such that the small flange 4 formed on the inner ring 5 can be inserted into the inner diameter side of the tapered roller 8. A direction gap is secured. For this reason, the step of expanding the bottom, which is required in the conventional bearing assembly, is not required. For this reason, it is possible to prevent the dimensional accuracy of the retainer from being reduced due to the bottom spreading step.

  Also, since the tapered inclined surface 10 is formed on the outer peripheral surface of the small flange 4 of the inner ring 5, when the inner ring 5 is inserted into the inner diameter side of the retainer 9, the axial center of the retainer 9 and the inner ring 5 Is slightly displaced, the rolling surface of the tapered roller 8 is guided by the inclined surface 10. Therefore, the inner ring 5 can be inserted smoothly.

  When the insertion of the inner ring 5 is completed, the ends of the cut portions 16 of the retainer body 11 are butted against each other as shown in FIG. 7 and 8, the large-diameter ring 12a is inserted into the large-diameter rim 15a and the small-diameter ring 12b is inserted into the small-diameter rim 15b from both ends in the axial direction of the retainer main body 11, as shown in FIGS. I do. Here, since the outer diameter surfaces of the large-diameter rim portion 15a and the small-diameter rim portion 15b are cylindrical surfaces, the large-diameter ring 12a and the small-diameter The ring 12b can be press-fitted smoothly.

  In press-fitting the large-diameter ring 12a and the small-diameter ring 12b, a radial force acts uniformly from the outer diameter side to the inner diameter side of the large-diameter rim portion 15a and the small-diameter rim portion 15b. For this reason, as in the caulking process performed in the conventional bearing assembly, an uneven force (compressive force from the outside to the inside in the radial direction) acts on the retainer, thereby reducing the dimensional accuracy of the retainer. It can be prevented from lowering.

  When the retainer main body 11 is held in an annular shape by press-fitting the large-diameter ring 12a and the small-diameter ring 12b, the outer ring 7 is provided coaxially with the inner ring 5 from the small-diameter side of the retainer 9 (see FIG. 1), and the assembly of the tapered roller bearing 1 is assembled. Complete. Instead of using the outer ring 7 as a separate member as in this embodiment, a component such as a housing of a device to which the tapered roller bearing 1 is applied may have a function as the outer ring 7.

  The tapered roller bearing cage 9 and the tapered roller bearing 1 according to the above-described embodiment are merely examples, and it is not necessary to expand the bottom of the cage 9 or to caulk the cage 9, thereby ensuring dimensional accuracy and suppressing cost increase. As long as the object of the present invention of providing a cage 9 for a tapered roller bearing can be solved, the shape, arrangement, number, and the like of each component can be appropriately changed.

  For example, in the above-described embodiment, a continuous annular holding ring 12 is employed. However, if the abutting state of the ends of the cut portions 16 formed on the retainer main body 11 can be maintained with certainty, one-sided holding ring 12 can be used. It is also conceivable to employ a C-shaped retaining ring 12 with a cut in the part.

  In the above embodiment, the retaining ring 12 (the large-diameter ring 12a and the small-diameter ring 12b) is press-fitted into the rims 15 (the large-diameter rim 15a and the small-diameter rim 15b) at both ends in the axial direction of the retainer main body 11. Although the configuration has been described, if the butting state of the ends of the cut portions 16 formed on the retainer main body 11 can be reliably maintained, the retaining ring 12 is provided only on the rim portion 15 at one axial end of the retainer main body 11. Can be considered.

  Further, in the above-described embodiment, the configuration in which the cut portions 16 are formed at one location in the circumferential direction of the retainer main body has been described. It is also possible to do.

DESCRIPTION OF SYMBOLS 1 Tapered roller bearing 2 Inner raceway 3 Large brim 4 Small brim 5 Inner race 6 Outer raceway 7 Outer race 8 Tapered roller 9 Tapered roller bearing retainer (retainer)
11 Main body of retainer 12 Retaining ring 13 Pocket part 14 Column part 15 Rim part 16 Cutting part

Claims (6)

A pocket portion (13) for holding a tapered roller (8), a column portion (14) disposed between the adjacent pocket portions (13, 13), and an annular portion connecting the column portions (14). A retainer body (11) having a rim portion (15), and having a cut portion (16) extending in the entire axial direction at at least one location in the circumferential direction;
An annular retaining ring (12) provided on an outer diameter surface of the rim portion (15) for retaining the ends of the cutting portion (16) in an abutted state;
Tapered roller bearing retainer having   2. The tapered roller bearing retainer according to claim 1, wherein the outer diameter surface has a cylindrical surface having a constant outer diameter in the axial direction.   The tapered roller bearing retainer according to claim 1 or 2, wherein the cut portions (16) are formed at both axial ends of the pocket portion (13).   The tapered roller bearing retainer according to claim 1 or 2, wherein the cut portion (16) is formed in the column portion (14).   The rim (15) is formed at both axial ends of the retainer body (11), and the retaining ring (12) is provided on each of the rims (15). 5. The tapered roller bearing retainer according to any one of 4. An inner ring (5) in which a tapered inner raceway (2) is formed on the outer peripheral surface, and a large collar (3) is formed on the large diameter side of the inner raceway (2) and a small collar (4) is formed on the small diameter side. When,
An outer ring (7) disposed coaxially with the inner ring (5) and having a tapered outer ring track (6) formed on an inner peripheral surface thereof and facing the inner ring track (2) and inclined in the same direction;
A plurality of tapered rollers (8) incorporated between the inner raceway (2) and the outer raceway (6);
The tapered roller bearing retainer (9) according to any one of claims 1 to 5, wherein the plurality of tapered rollers (8) are held at predetermined intervals in a circumferential direction.
Tapered roller bearings.

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