JP4196390B2 - Spherical roller bearing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a self-aligning roller bearing, and this roller bearing is incorporated in various mechanical devices and used to support a rotating shaft so that it can be aligned inside a housing.
[0002]
[Prior art]
Conventionally, a self-aligning roller bearing with a cage as shown in FIGS. 7 to 9 has been used to rotatably support a heavy shaft inside the housing. In this self-aligning roller bearing with a cage, a plurality of spherical rollers 3 and 3 are arranged to roll freely between an outer ring 1 and an inner ring 2 that are concentrically combined with each other, and a metal plate is press-molded. The plurality of spherical rollers 3 and 3 are prevented from being separated by the cages (press cages) 4 and 4 formed as described above.
[0003]
Among these, an outer ring raceway 5 that is a spherical concave surface having a single center is formed on the inner peripheral surface of the outer ring 1. A pair of inner ring raceways 6 and 6 are formed on the outer peripheral surface of the inner ring 2 so as to face the outer ring raceway 5 in the respective width directions (left and right direction in FIG. 6). The plurality of spherical rollers 3 and 3 are symmetrical in that the maximum diameter portion is in the center of the axial length of each spherical roller 3 and 3, and the outer ring raceway 5 and the pair of inner ring raceways 6 and 6 are arranged so as to roll freely in two rows.
[0004]
The retainer 4 includes a conical cylindrical main body portion 7, an outward flange portion 8 extending radially outward from the large-diameter side edge of the main body portion 7, and a diametrically inner side from the small-diameter side edge. And an inward flange portion 9 extending in the direction. A plurality of pockets 10, 10 are circumferentially provided in the main body 7, and one spherical roller 3, 3 is held in each pocket 10, 10 so as to be rotatable. Note that the main body 7 is positioned on the inner side in the diameter direction from the pitch circle of the plurality of spherical rollers 3 and 3 (a circle connecting the central axes of the plurality of spherical rollers 3 and 3) on both the large diameter side and the small diameter side. Thus, the spherical rollers 3 and 3 are prevented from slipping out through the pockets 10 and 10 to the inside of the main body portion 7 in the diameter direction.
[0005]
Further, the outer peripheral edges of the outward flange portions 8 and 8 of the pair of cages 4 and 4 are brought into sliding contact with the inner peripheral surface of the guide ring 11, respectively, and the inner peripheral edges of the inward flange portions 9 and 9 are connected to the inner ring. It is guided by being brought into sliding contact with the outer peripheral surface of the end of 2. The guide ring 11 is rotatably provided between the plurality of spherical rollers 3 and 3 provided in the two rows.
[0006]
Further, inclined protrusions 12 are formed in the width direction of the cage 4 on the outer surface of the outward flange portions 8 and 8 and in the circumferential direction at the intermediate portions of the pockets 10 and 10, respectively. . On the other hand, concave portions 14 and 14 are formed in portions facing the inclined projections 12 on the end surfaces of the respective spherical rollers 3 and 3. Then, by engaging the tip portion of the inclined protrusion 12 and the concave portion 14, the spherical rollers 3 and 3 held in the pockets 10 and 10 are prevented from coming out outward in the diameter direction. As a result, the spherical rollers 3 and 3 that are rotatably held in the pockets 10 and 10 do not come out from the inside of the pockets 10 and 10 in any of the inside and outside of the diametrical direction.
[0007]
When the rotating shaft is supported inside the housing by the self-aligning roller bearing with cage configured as described above, the outer ring 1 is fitted and fixed to the housing, and the inner ring 2 is fixed to the rotating shaft. When the inner ring 2 rotates together with the rotation shaft, the plurality of spherical rollers 3 and 3 roll to allow this rotation. If the shaft center of the housing and the shaft center of the rotating shaft do not match, the inner ring 2 is aligned inside the outer ring 1 to compensate for this mismatch, but the outer ring raceway 5 is formed in a single spherical shape. The rolling of the plurality of spherical rollers 3 and 3 is performed smoothly even after the inconsistency compensation.
[0008]
[Problems to be solved by the invention]
In this cage type, the insertion length of the spherical roller is the shortest distance between the tip of the inclined protrusion and the pocket of the flange on the small diameter side of the cage, and the roller falls off the cage because the insertion length is longer than the axial length of the roller. Is the case. However, the insertion length dimension is shorter than the roller length. When the bearing is in use, the insertion length is reduced due to contact wear with the roller end face recess at the tip of the cage inclined protrusion and contact with the opposite (tail side) end face of the pocket surface of the cage small-diameter flange. As the size increases, the engagement allowance for preventing the roller from falling off decreases, and the roller may fall off radially outward from the cage.
[0009]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a spherical roller bearing that prevents the spherical surface from falling off.
[0010]
[Means for Solving the Problems]
An outer ring 1 having an outer ring raceway which is a spherical concave surface having a single center formed on its inner peripheral surface, an inner ring 2 having a pair of inner ring races opposed to the outer ring track formed on its outer peripheral surface, the outer ring track and A pair of retainers 4 having a plurality of two rows of spherical rollers 3 provided between the inner ring raceways so as to be capable of rolling, and holding the spherical rollers in a freely rollable manner. Pocket 10, a conical cylindrical body 7, an outward flange 8 extending radially outward at the large diameter edge of the body, and an inward extending radially inward at the small diameter edge Each of the plurality of spherical rollers in each row has a concave portion 14 on an end surface facing the outward flange portion, and is formed on the inner peripheral edge of the outward flange portion 8 of each cage. Are in the diametrical direction at the circumferential intermediate portion of each pocket 10. A plurality of inclined protrusions 15 extending toward the end face of the spherical roller are formed, and the tip of the inclined protrusion 15 and the recess are engaged to prevent the spherical roller from falling out of the pocket. In the self-aligning roller bearing, the angle α with respect to the bearing center line at the tip of the inclined protrusion is a spherical roller when the spherical roller is maintained in the contact angle (angle from the bearing center line to the roller center line). It is set to be the same as the angle α ′ with respect to the bearing center line of the circular concave portion of the end face.
[0011]
【Example】
1-6 has shown the press holder | retainer of the Example of this invention. In addition, the same code | symbol is attached | subjected to the same part as the conventional self-aligning roller bearing with a cage mentioned above, the overlapping description is abbreviate | omitted, and the characteristic part of this invention is demonstrated hereafter.
[0012]
A circular concave portion 14 having a constant diameter is formed at a portion of the end surface of the spherical roller 3 facing the outward flange portion 8 formed at the inner end edge of the cage 4. In addition, inclined projections 15 are formed at the inner peripheral edge of the outward flange portion 8 at the positions in the middle in the circumferential direction of the plurality of pockets 10. Each inclined protrusion 15 extends radially inward from the inner peripheral edge of the outward flange portion 8, and extends outward in the axial direction toward one end surface of the spherical roller 3. Further, in this embodiment, the angle α with respect to the bearing center line D of the inclined protrusion tip portion 15a is the same as the angle α ′ with respect to the bearing center line D of the recess 14 when the roller 3 maintains the posture at the contact angle β. It is set to become. When the spherical roller 3 is assembled inside the pocket 10, the tip 15a of the inclined protrusion 15 engages with the concave portion 14 formed on the end surface of the spherical roller 3 by the engagement allowance δ shown in FIG. The spherical roller 3 is prevented from falling off from the inside of the pocket 10.
[0013]
In addition, the rigidity of the inclined protrusion 15 supported in a cantilever manner on the inner peripheral edge of the outward flange portion 8 can be adjusted by the width dimension W extending in the circumferential direction or the length dimension L extending in the diameter direction. Even if the thickness of the metal plate constituting the container 4 is not particularly reduced, the assembling property of the spherical rollers 3 and 3 inside the pockets 10 and 10 can be ensured.
[0014]
With this configuration, the distance between the inclined projection tip 15a and the recess 14 is longer than when the angles α and α ′ are in the relationship of α ′ <α. Even when moving in the direction, contact wear is reduced. That is, since there is no al lengthen insertion length dimension, thereby preventing the roller from falling off.
[0015]
In order to form the outward flange 8 on the large-diameter side end of the main body 7, as shown in FIGS. 4 to 6, one end edge of the column portion 16 portion that partitions the adjacent pockets 10 and 10 is bent outward in the diametrical direction. ing. The pocket surface of the small-diameter flange portion of the cage 10 of the pocket 10 is composed of two planes 10a that form a constant angle with 10b and 10b that is parallel to the roller end surface. The intersection 10c between these two planes and the tip of the inclined protrusion tip 15a The point l constitutes the insertion length l of the roller into the cage pocket. In this embodiment, the tip end portion 15a of the inclined protrusion and the concave portion 14 face each other, and the facing surfaces 15b and 14a in each of them are parallel to each other. Further, the insertion angle γ, that is, the angle formed by the straight line perpendicular to the insertion height direction and the bearing center line D is set to be larger than the contact angle β ( γ > β).
[0016]
Further, the end surface 16 of each spherical roller 3 is in sliding contact with the side surface of the guide ring 11 at a position in the vicinity of the center of rotation existing inside the circular recess 14 having the constant diameter. For this reason, the frictional force acting between the spherical rollers 3 and 3 and the side surface of the guide ring 11 is small, and the power loss is small.
[0017]
For this reason, it is advantageous with respect to roller drop-off in the following points. That is, conventionally, the roller falls off when the inner ring, the roller and the cage assembly come off from the outer ring. In this state, the roller just above the bearing maintains the posture at the contact angle β along the inner ring raceway surface, but the roller just below the roller head side end surface relief part and the cage inclined protrusion are in contact with each other. It supports the weight, and the tail side of the roller falls due to gravity and comes out to the head side. On the other hand, in the present invention, since the insertion angle γ is set larger than the contact angle β, the roller does not fall off. Moreover, since the front-end | tip part and recessed part of an inclination protrusion oppose and those opposing surfaces are parallel, when a roller moves to a radial direction, it becomes the most difficult to contact a nail | claw.
[0018]
The operation itself when the self-aligning roller bearing with cage of the present invention supports the rotating shaft inside the housing is the same as that of the conventional self-aligning roller bearing with cage.
[0019]
As shown in FIG. 7, the guide ring 11 may be removed from the embodiment of FIG. 1 and the inward flanges 8 of the cage 4 may be brought into contact with each other. In the above-described embodiment, the conical cylindrical body portion 7 is positioned on the inner side in the diameter direction than the pitch circle of the plurality of spherical rollers, but may be positioned on the outer side.
[0020]
In addition, the recessed part 14 of the end surface of each spherical roller 3 is not limited to the circular shape of the fixed diameter of an Example, A cage may also be made from a synthetic resin.
[0021]
【The invention's effect】
According to the present invention, prevention for rollers or cage during rotation of the bearing does not contact wear be moved in the radial direction of the self-aligning roller bearings increases, there is no et lengthen insertion length dimensions, the roller attrition Is done.
[0022]
Furthermore, since the insertion angle is set larger than the contact angle, the rollers are prevented from falling off. .
[Brief description of the drawings]
FIG. 1 is a partial sectional view showing an embodiment of the present invention.
2 is a view of the right cage in FIG. 1 as viewed from the left in FIG. 1;
3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is a partial perspective view of the cage as viewed from the outer peripheral side.
FIG. 5 is a partial perspective view of the cage as viewed from the inner circumference side.
6 is an enlarged view of the spherical roller, the cage, and the inner and outer rings of FIG. 1. FIG.
FIG. 7 is a partial cross-sectional view showing an embodiment of the present invention.
FIG. 8 is a partial cross-sectional view showing a conventional structure.
9 is a view of the right cage in FIG. 8 as viewed from the left in FIG. 8;
10 is a cross-sectional view taken along the line CC of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Spherical roller 4 Cage 5 Outer ring raceway 6 Inner ring raceway 7 Main body part 8 Outward flange part 9 Inward flange part 10 Pocket 11 Guide ring 14 Recess 15 Inclination protrusion α Angle of inclination protrusion to bearing straight line β Contact angle γ Insertion angle l Insertion length D Bearing center line E Roller center line

Claims (2)

An outer ring formed on the inner peripheral surface of an outer ring raceway that is a spherical concave surface having a single center;
An inner ring having a pair of inner ring raceways opposed to the outer ring raceway formed on the outer peripheral surface thereof;
A plurality of two rows of spherical rollers provided so as to roll between the outer ring raceway and the inner ring raceway,
A pair of cages for holding the spherical rollers in a rollable manner, each cage having a plurality of pockets, and having a conical cylindrical main body portion and a diametrically outer side at a large-diameter side edge of the main body portion. And an inward flange portion extending inward in the diametrical direction at the small-diameter side edge, respectively,
Each of the plurality of spherical rollers in each row has a recess on an end surface facing the outward flange portion, and the inner peripheral edge of the outward flange portion of each cage has a diameter in the circumferential intermediate portion of each pocket. A plurality of inclined projections extending inward in the direction and extending toward the end surface of the spherical roller are formed, and the tip of the inclined projection and the recess are engaged to prevent the spherical roller from falling out of the pocket. Spherical roller bearings that
The angle of the tip of the inclined protrusion with respect to the bearing center line is relative to the bearing center line of the circular recess at the end face of the spherical roller when the spherical roller is maintained in the contact angle (angle from the bearing center line to the roller center line). Roller self-aligning roller bearing characterized by being set to be the same as the angle. In claim 1, the pocket surface of the cage small diameter side flange portion is composed of two intersecting planes,
When the distance between this intersection and the tip of the inclined projection is the insertion length of the spherical roller into the cage pocket, the insertion angle (angle from the bearing center line in the direction perpendicular to the insertion length) is larger than the contact angle. Roller self-aligning roller bearing with retainer set to.

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