JP2006336752A - Assembling method of self-aligning roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically assemble various types of self-aligning roller bearings by suppressing a maximum tensile stress occurring in an outer ring 2 by deforming the outer ring 2 in an elliptic shape so that the elastically deformed amount of the outer ring 2 can be increased and deforming the outer ring 2 in the elliptic shape to increase an area allowing an inserting operation. <P>SOLUTION: The outer peripheral surface of the outer ring 2 is inwardly pressed at two positions on one side and two positions on the opposite side totaling four positions in the diameter direction by the tip faces 15, 15 of a pair of pressing tools 14, 14 disposed in the opposed state to each other through the outer ring 2. Abutting positions between the tip faces 15, 15 of these pressing tools 14, 14 and the outer peripheral surface of the outer ring 2 are set at portions displaced by 15 to 30° from the pressing center of the outer ring 2 by the pressing tools 14, 14 to both sides thereof in the circumferential direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement in an assembling method of a self-aligning roller bearing that is incorporated in various mechanical devices and supports a rotating shaft inside a housing, for example.

  For example, a self-aligning roller bearing as described in Patent Document 1 has been conventionally used to rotatably support a heavy shaft inside a housing. 7 to 8 show a self-aligning roller bearing 1 that has been widely known in the past, as described in Patent Document 1. The self-aligning roller bearing 1 includes a plurality of spherical rollers 4 and 4 arranged in a freely rollable manner between an outer ring 2 and an inner ring 3 that are concentrically combined with each other. A pair of cages 5 and 5 prevent separation of the plurality of spherical rollers 4 and 4.

  An outer ring raceway 6 that is a spherical concave surface having a single center is formed on the inner peripheral surface of the outer ring 2. Further, a pair of inner ring raceways 7 and 7 are formed on both sides of the outer circumferential surface of the inner ring 3 in the width direction (left and right direction in FIG. 7). The plurality of spherical rollers 4 and 4 have a symmetrical shape in which the maximum diameter portion is at the center of the axial length of each spherical roller 4 and 4, and the outer ring raceway 6 and the pair of inner ring raceways 7, 7 is arranged so as to be freely rollable in two rows.

  In both the cages 5 and 5, a plurality of pockets 9 for holding the spherical rollers 4 and 4 so as to be freely rollable are formed at equal intervals in the circumferential direction in a conical cylindrical main portion 8. is doing. The main portion 8 is disposed radially inside the pitch circle diameter of the spherical rollers 4 and 4, and the width of the pockets 9 in the circumferential direction of the main portion 8 is set so that the spherical rollers 4 4 is smaller than the outer diameter. Therefore, the spherical rollers 4 and 4 held in the pockets 9 do not come out to the inner diameter side of the cages 5 and 5. Further, an outward flange portion 10 is formed at the large-diameter end edge portion of the main portion 8, and the metal plate is bent outward in the radial direction. And the elastic tongue piece 11 formed in the state which protrudes radially inward in the position equivalent to the circumferential direction intermediate part of each said pocket 9 in the inner peripheral part of this outward flange part 10 is each said spherical roller. 4, 4 and 4 are engaged with circular recesses 12 formed at the center of both end faces in the axial direction. Due to the engagement between the elastic tongue 11 and the recess 12, the spherical rollers 4, 4 can be incorporated into the pockets 9 from the outside in the radial direction of the main portion 8. The spherical rollers 4 and 4 are prevented from coming out to the outer diameter side of the cages 5 and 5.

  For example, when the rotating shaft is supported inside the housing by the self-aligning roller bearing 1 configured as described above, the outer ring 2 is fitted and fixed to the housing, and the inner ring 3 is fitted and fixed to the rotating shaft. When the inner ring 3 rotates together with the rotation shaft, the plurality of spherical rollers 4 and 4 roll to allow this rotation. If the shaft center of the housing and the shaft center of the rotary shaft do not match, the inner ring 3 is aligned inside the outer ring 2 (the central axis of the inner ring 3 is inclined with respect to the central axis of the outer ring 2). Compensate for discrepancies. In this case, since the outer ring raceway 6 is formed in a single spherical shape, the rolling of the plurality of spherical rollers 4 and 4 is performed smoothly even after the mismatch compensation.

The process of assembling the self-aligning roller bearing 1 configured and acting as described above is described in Patent Document 2, for example. When the self-aligning roller bearing 1 is assembled, first, an inner ring assembly 13 as shown in FIG. 9 is assembled outside the outer ring 2. The inner ring assembly 13 is formed by assembling a plurality of spherical rollers 4 and 4 together with a pair of cages 5 and 5 around the inner ring 3. Since the outer diameter D 13 of such an inner ring assembly ₁₃ is larger than the inner diameter R ₂ of the opening of the outer ring 2 (D ₁₃ > R ₂ ), it cannot be inserted inside the outer ring 2 as it is. Therefore, as described in Patent Document 2, as shown in FIG. 10, the outer ring 2 is pressed radially inward from the opposite side in the diametrical direction to elastically deform the outer ring 2 into an elliptical shape. The major axis of the ellipse is made larger than the outer diameter of the inner ring assembly 13. Then, substantially in this state, as shown in FIG. 9-10, the inner ring assembly 13 to the inside of the outer ring 2, the the central axis O ₁₃ of the inner ring assembly 13 and the central axis O ₂ of the outer ring 2 In such a state, the center of curvature of the outer ring raceway 6 is inserted so as to be located on the central axis O ₁₃ of the inner ring assembly 13. After the insertion, the force pressing the outer ring 2 from the opposite side in the radial direction is released, and the outer ring 2 is restored to a circular shape.

As described above, the inner ring assembly 13 is placed in the outer ring ₂ , and the central axes O ₂ and O _{13 of the} outer ring 2 and the inner ring assembly ₁₃ are substantially on the center of curvature of the outer ring raceway 6. After performing an insertion operation for inserting the rods into an orthogonal state, an assembling operation called a so-called return operation is performed in which both the central axes O ₂ and O ₁₃ coincide with each other. That is, the inner ring assembly 13 is swung substantially 90 degrees around the diameter direction of the inner ring assembly 13 and the outer ring 2. Then, as shown in FIGS. 7 to 8 described above, the inner ring assembly 13 is assembled inside the outer ring 2. Such a return work procedure is described in Patent Document 3, for example.

  In the case of the conventional method described in the above-mentioned Patent Document 2, in order to elastically deform the outer ring 2 into an elliptical shape, as shown in FIG. Pressing strongly. When the outer ring 2 is deformed into an elliptical shape in this way, a large tensile stress is generated in a part of the outer ring 2. In order to suppress the tensile stress to a value that does not cause damage such as cracks in the outer ring 2, it is necessary to reduce the amount of elastic deformation of the outer ring 2. Therefore, for example, depending on the size and shape of the outer ring 2 such as the axial width of the outer ring 2 being large, the assembling method as shown in FIG. 10 cannot be adopted. In such a case, the inner ring assembly 13 is inserted inside the outer ring 2 without incorporating spherical rollers in some of the pockets 9 and 9 provided in the cages 5 and 5. Thereafter, the inner ring assembly 13 is slightly rotated, and then the spherical rollers are assembled into the partial pockets. However, when such an operation is employed, the assembly operation of the self-aligning roller bearing cannot be automated (the insertion operation needs to be performed manually).

  In Patent Document 4, in order to increase the number of balls constituting a single-row deep groove type ball bearing, when the balls are assembled while elastically deforming the outer ring, two positions on the opposite side in the diameter direction of the outer ring are set. A technique for pressing in directions toward each other is described. However, in the prior art described in Patent Document 4, such a ball can be inserted into a part of the space between the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring arranged in an eccentric state. This is intended to ensure the circumferential length of the roller and is basically different from the assembly method of the self-aligning roller bearing which is the subject of the present invention.

Japanese Patent No. 3529191 JP 54-27644 A Japanese Patent Laid-Open No. 11-42521 JP 2004-68985 A

  In view of the circumstances as described above, the present invention suppresses the maximum tensile stress generated in the outer ring as the outer ring is deformed into an elliptical shape, and can increase the elastic deformation amount of the outer ring. The invention was invented to realize a method of assembling a self-aligning roller bearing which can be deformed into a wide range to perform an insertion operation.

  The self-aligning roller bearing that is an object of the assembling method of the present invention includes an outer ring in which an outer ring raceway that is a spherical concave surface is formed on the inner peripheral surface, similar to the conventional self-aligning roller bearing described above. An inner ring having a pair of inner ring raceways opposed to the outer ring raceway formed on the outer peripheral surface, a plurality of spherical rollers provided between the outer ring raceway and the inner ring raceway so as to be able to roll in two rows, and It comprises a cage having a plurality of pockets for holding each spherical roller in a rollable manner.

  Also, in the method of assembling the self-aligning roller bearing according to the present invention, an inner ring assembly in which the inner ring, the spherical rollers and the cage are combined in advance is assembled to assemble the self-aligning roller bearing as described above. Inside the outer ring, the center axis of the inner ring assembly and the center axis of the outer ring are inserted so as to be substantially orthogonal at the center of curvature of the outer ring raceway. During this insertion operation, the outer ring is pressed in the direction opposite to the diametrically opposite portion until the outer ring becomes elliptical, and the long diameter of the opening of the outer ring is large enough to insert the inner ring assembly. Let it elastically deform.

In particular, in the method of assembling the self-aligning roller bearing according to the present invention, the diameter direction of the outer peripheral surface of the outer ring is determined by the tip surfaces of the pair of pressing jigs arranged so as to face each other with the outer ring interposed therebetween. Each of the two positions on the opposite side is pressed in a direction that brings the total of four positions closer to each other. And the contact position of the front end surface of both the pressing jigs and the outer peripheral surface of the outer ring is set to a portion deviated by 15 to 30 degrees on both sides in the circumferential direction from the pressing center of the outer ring by these pressing jigs. To do.
For this purpose, for example, as described in claim 2, the front end surfaces of the two pressing jigs are V-shaped concave surfaces having an included angle of 120 to 150 degrees. That is, in order to carry out the present invention, the tip surface does not necessarily have to be a V-shaped concave surface, but if it is a V-shaped concave surface, the contact position can be easily and stably regulated. You can do it.

  According to the assembling method of the self-aligning roller bearing of the present invention configured as described above, the maximum tensile stress generated in the outer ring when the outer ring is deformed into an elliptical shape can be suppressed. Thus, the point which can suppress the maximum tensile stress is demonstrated, referring FIGS. In addition, about the code | symbol of each structural member etc. of the self-aligning roller bearing 1, what was shown in FIGS. 5-10 other than FIG. 1 is used.

  In order to carry out the present invention, in order to deform the outer ring 2 into an elliptical shape in order to insert the inner ring assembly 13, a pair of pressure treatments each translated by a linear actuator such as a hydraulic cylinder or a feed screw mechanism. The outer ring 2 is firmly held by the tools 14 and 14 from the opposite side in the diameter direction. When the front end surfaces 15 and 15 of both the pressing jigs 14 and 14 are flat surfaces existing in a direction perpendicular to the parallel movement direction, as in the case of the conventional method shown in FIG. The two positions on the opposite side of the outer ring 2 in the diametrical direction are pressed in a direction approaching each other. On the other hand, when the front end surfaces of the pressing jigs 14 and 14 are V-shaped concave surfaces, two positions on the outer peripheral surface of the outer ring 2 opposite to each other in the diametrical direction are arranged at a total of four positions. It will be in the state pressed in the direction which approaches. Then, by changing the inclination angle θ of the pair of inclined surfaces 16, 16 constituting the tip surfaces 15, 15, the contact position between the inclined surfaces 16, 16 and the outer peripheral surface of the outer ring 2 is changed. Can be adjusted. That is, when the inclined surfaces 16 and 16 are inclined by θ with respect to the flat surface, the inclined surfaces 16 and 16 and the outer peripheral surface of the outer ring 2 are formed by the pressing jigs 14 and 14. The outer ring 2 comes into contact with a position deviated by θ in the circumferential direction from the pressing center of the outer ring 2.

  Therefore, assuming that the inclination angle θ is variously changed, when the outer ring 2 is deformed into an oval shape by the same amount (to the extent that the inner ring assembly 13 can be inserted inside), The tensile stress generated in a part of the outer ring 2 (the edge in the width direction of the outer ring raceway 6 having the smallest inner diameter) was obtained (by FEM analysis). The bar graph shown in white in FIG. 2 shows this result. As is apparent from FIG. 2, the inclination angle θ is set to 20 degrees, and the contact positions of the inclined surfaces 16, 16 and the outer peripheral surface of the outer ring 2 are shifted by 20 degrees on both sides from the pressing center. If set to, the tensile stress can be minimized. If the inclination angle θ is set within a range of 15 to 30 degrees, and the contact position is set at a position deviated by 15 to 30 degrees on both sides from the pressing center, the angle can be set to another angle range. In comparison, the tensile stress can be suppressed sufficiently low.

  For example, FIG. 3 shows the case where the contact position is set as the pressing center (only two positions on the opposite side in the diameter direction) for the eight types of outer rings 2 having different sizes (model numbers). As a median value of ˜30 degrees, the magnitude of the maximum tensile stress generated in the outer ring 2 for the case where a total of four positions, two positions shifted by 22.5 degrees in the circumferential direction from the pressing center, The result calculated | required by FEM analysis is shown. As is clear from FIG. 3, when the contact position is distributed from the pressing center to both sides in the circumferential direction regardless of the size of the outer ring 2, the contact position is made to coincide with the pressing center. As compared with the above, the value of the maximum tensile stress can be reduced by 30 to 38%.

  For this reason, the amount of elastic deformation of the outer ring 2 can be increased by distributing the contact position from the center of pressing to both sides in the circumferential direction. For example, even when the width dimension in the axial direction is large and the difference between the inner diameter of the opening in the free state and the outer diameter of the inner ring assembly is large, the outer ring 2 is deformed into an elliptical shape by deforming the outer ring 2 into an oval shape. The inner ring assembly 13 can be inserted into the inner ring. As a result, the types of self-aligning roller bearings that can be automatically assembled can be increased. In other words, it is possible to automatically assemble a self-aligning roller bearing having the outer ring 2 having a large width.

In the case of carrying out the present invention, when there are oil passage holes 26, 26 communicating the inner and outer peripheral surfaces of the outer ring 2 at evenly spaced circumferential positions of the outer ring 2. As described above, the center position of the force that presses the outer ring 2 by the pair of pressing jigs 14 and 14 is the position between the oil passage holes 26 and 26 adjacent in the circumferential direction.
In this way, it is possible to prevent stress from concentrating on the oil passage holes 26 and 26 where damage such as cracks is likely to occur due to stress concentration. That is, as is apparent from the black bar graph shown in FIG. 2, the maximum value of the stress generated in the oil passage holes 26 and 26 where damage is likely to occur is suppressed, and the oil passage holes 26 and 26 are provided. It is also possible to automatically assemble a self-aligning roller bearing having the outer ring 2.

Preferably, when the present invention is carried out, as described in claim 4, after the inner ring assembly 13 is inserted into the inner side of the outer ring 2, the inner ring assembly 13 is inserted into the inner ring assembly 13 and the outer ring. The inner ring assembly 13 is incorporated into the inner side of the outer ring 2 by swinging substantially 90 degrees around the diameter direction of No. 2 and performing a so-called returning process. In this returning step, the inner ring assembly 13 is brought into the inner side of the outer ring 2, and the central axes of the inner ring assembly 13 and the outer ring 2 are substantially perpendicular to each other at the center of curvature of the outer ring raceway. While inserting, the said outer ring | wheel 2 is mounted in the base which has a spherical recessed part. In this state, the spherical rollers 4, 4 constituting the inner ring assembly 13 are guided by the guiding spherical concave surface which is the inner surface of the spherical concave portion, and the inner ring assembly 13 is swung around the diametrical direction. By moving, the central axis of the inner ring assembly 13 and the central axis of the outer ring 2 are substantially matched.
When the invention described in claim 4 is carried out, the inner ring assembly is preferably obtained by combining the inner ring 3, the spherical rollers 4, 4 and the cages 5, 5 in advance as described in claim 5. 13, a temporary assembling step, an inserting step of inserting the inner ring assembly 13 into the inner side of the outer ring 2, and an inner ring assembly of the inner ring assembly 13 inserted into the outer ring 2 by swinging by 90 degrees. The return step of substantially matching the central axes of the outer ring 2 and the outer ring 2 is automatically performed without manual intervention.
With this configuration, the assembly operation of the self-aligning roller bearing 1 can be fully automated, and the cost of the self-aligning roller bearing 1 can be reduced.

  4 to 6 show an embodiment of the present invention. The self-aligning roller bearing assembly apparatus used in the present embodiment includes a pedestal 17, a swing arm 18, and pressing jigs 14 and 14. Of these, the pedestal 17 is made of a metal such as stainless steel, or a synthetic resin such as polyamide resin or polyacetal resin, and is supported and fixed on the upper surface of a swivel base (not shown). The swivel base rotates about a rotation center axis disposed in the vertical direction, and the pedestal 17 is disposed concentrically with the rotation center axis. Further, the pedestal 17 has an outer ring 2 constituting the self-aligning roller bearing 1 placed on the upper surface thereof, and has a spherical recess 19 opened on the upper surface. The spherical concave portion 19 is provided with a spherical concave surface for guide 20 having a point on the rotation center axis as a center of curvature, and a concave portion radially outward (downward) from the spherical concave surface 20 for guide at the bottom. And a recess 21 for draining oil. The spherical concave surface 20 for guide has a radius of curvature substantially the same as the outer ring raceway 6 formed on the inner peripheral surface of the outer ring 2. In the state where the outer ring 2 is placed on the pedestal 17, the center of curvature of the outer ring raceway 6 and the center of curvature of the spherical concave surface 20 for guidance substantially coincide.

  The base end portion (upper end portion in FIG. 4) of the swing arm 18 is coupled and fixed at a position deviating from the center of rotation on the front surface of the output board 23 of the rotary actuator 22. The output board 23 swings and displaces around a rotation center axis arranged in the horizontal direction, and the height position of the rotation center axis is the above-described state in a state where it is placed on the upper surface of the pedestal 17. It substantially matches the position of the center of curvature of the outer ring raceway 6 (as much as possible excluding errors). Further, the tip of the swing arm 18 is either spherical roller constituting the inner ring assembly 13 inserted inside the outer ring 2 above the outer ring 2 placed on the upper surface of the pedestal 17. It exists in the position which can be engaged with (abutted on) the axial direction end surface of 4 freely.

  Further, both the pressing jigs 14 and 14 are outputs of a direct-acting actuator 24, which is provided concentrically with each other in a state of being opposed to each other, such as a hydraulic cylinder, a feed screw mechanism, and the like that can strictly regulate the amount of displacement. The rod 25 is supported and fixed concentrically with each other at the distal end portion thereof. The two pressing jigs 14 and 14 hold the outer ring 2 from the opposite side in the diametrical direction while approaching each other as the actuators 24 extend. The outer ring 2 is supported above the pedestal 17 concentrically with the guiding spherical concave surface 20.

  Also, the two pressing jigs 14 and 14 are brought closer to the outer ring 2 by the both actuators 24 than the position for supporting the outer ring 2 concentrically with the guiding spherical concave surface 20. As shown in FIG. 10, it can be deformed into an ellipse. For this purpose, a pair of inclined surfaces 16 and 16 as shown in FIG. 1 are provided on the front end surfaces 15 and 15 of the pressing jigs 14 and 14, respectively. Yes. Then, the outer ring 2 placed on the pedestal 17 is deformed into an oval shape, and the inner ring assembly 13 is inserted into the outer ring 2 so that an insertion operation can be performed.

  In the case of the present embodiment, as the outer ring 2, as shown in (A) in the upper part of FIG. 6, oil passage holes 26 and 26 are formed at four positions at equal intervals in the circumferential direction. As shown in the lower part (B), automatic assembly can be performed regardless of whether the oil passage hole is not provided. Therefore, in the case of the present embodiment, photoelectric switches 27a and 27b (light projector and light receiver) are arranged at two positions sandwiching the outer ring 2 placed on the upper surface of the pedestal 17 from the opposite side in the diameter direction. Yes. Light such as laser light is transmitted and received between the photoelectric switches 27a and 27b by passing through the oil passage holes 26 and 26.

  In the case of the present embodiment, after the outer ring 2 is placed on the upper surface of the pedestal 17 and concentrically with the pedestal 17, the pedestal 17 is moved up to 1 before the pressing jigs 14 and 14 are brought close to each other. Rotate twice. For example, when the outer ring 2 has the oil passage holes 26, 26, the outer ring 2 is pressed by the pressing jigs 14, 14 as shown in FIGS. At the moment when the center position of the applied force is just between the circumferentially adjacent oil passage holes 26, 26, light is exchanged between the photoelectric switches 27a, 27b. Therefore, at this moment, the rotation of the pedestal 17 is once stopped, and the pressing jigs 14 and 14 are brought close to each other as shown in FIGS. And the said outer ring | wheel 2 is deform | transformed into an ellipse, and the said insertion operation | work is performed.

  On the other hand, in the case where the oil passage hole is not provided as shown in the lower part (B) of FIG. 6, as shown in (a) → (c) of FIG. Even when ½ is rotated, there is no moment when light is exchanged between the photoelectric switches 27a and 27b. Therefore, in this case, it is assumed that the outer ring 2 does not have an oil passage hole, and the pressing jigs 14 and 14 are brought closer to each other as shown in FIGS. Then, the outer ring 2 is deformed into an oval shape and the insertion operation is performed.

  In the case of the present embodiment, after performing the insertion work in this way, the force that the actuators 24 press the outer ring 2 is applied (to the extent that the outer ring 2 is not deformed but can be positioned). After the weakening, a so-called return operation step is performed in which the inner ring assembly 13 is oscillated and displaced so that the central axis of the inner ring assembly 13 and the central axis of the outer ring 2 coincide with each other.

In the state where the inner ring assembly 13 is inserted into the inner side of the outer ring 2 placed on the upper surface of the pedestal 17 by the insertion operation, the lower half of the spherical rollers 4 and 4 constituting the inner ring assembly 13 The rolling surfaces of the spherical rollers 4, 4 present in the contact with the guide spherical concave surface 20. Then, in the starting state of the flashing operation, the central axis O ₂ of the center axis O ₁₃ and the outer ring 2 of the inner ring assembly 13, with the center of curvature O ₆ parts of the outer ring raceway 6 of the inner peripheral surface of the outer ring 2 Substantially orthogonal. In the start state, the tip end of the swing arm 18 is present on the side of the upper end of the inner ring assembly 13 as shown in FIG.

  As shown in FIG. 5A, when the inner ring assembly 13 is inserted into the inner side of the outer ring 2 placed on the upper surface of the pedestal 17, the swing arm 18 that has been stopped until then is From the state shown in FIG. 5A, it is oscillated and displaced counterclockwise. Then, the inner ring assembly 13 is oscillated and displaced about the diameter direction of the inner ring assembly 13 and the outer ring 2 in the order shown in FIGS. 5A to 5C. The inner ring assembly 13 is incorporated inside the outer ring 2 along with the swing displacement.

  As shown in FIGS. 5 (A) → (B) → (C), the spherical rollers 4 constituting the inner ring assembly 13 are assembled in the process of incorporating the inner ring assembly 13 into the inner side of the outer ring 2. 4 enters the inside of the outer ring raceway 6 while being guided by the guiding spherical concave surface 20. There is a minute step based on an unavoidable error between the upper end opening edge of the guide spherical concave surface 20 and the lower end opening edge of the outer ring raceway 6. These spherical rollers 4 and 4 are fed into the outer ring raceway 6 without difficulty based on the presence of chamfering in the portion. In addition, in the case of this embodiment, the inner ring assembly 13 and the outer ring 2 are vibrated as the pedestal 17 is rotated. Accordingly, the positional relationship between the spherical rollers 4 and 4 and the outer ring 2 that are in contact with each other in the course of the above-described returning operation becomes unstable, and in the middle of this returning operation, the axial end edge of any of the spherical rollers 4 Even if the outer periphery of the outer ring 2 is caught, the hooked state is immediately resolved without being stabilized. For this reason, the spherical roller 4 can be fed into the outer ring raceway 6. Further, even when the spherical rollers 4 and 4 are fed into the outer ring raceway 6, the friction acting between the rolling surfaces of the spherical rollers 4 and 4 and the outer ring raceway 6 is reduced. It can be suppressed. Therefore, the inner ring assembly 13 can be incorporated inside the outer ring 2 without causing damage such as scratches on the rolling surfaces and the outer ring raceway 6. The reason for rotating the pedestal 17 is to make the positional relationship between the spherical rollers 4 and 4 and the outer ring 2 unstable, so that the pedestal 17 is vibrated by a vibrator or the like without rotating the pedestal 17. You may let them.

  In the illustrated embodiment, the bottom of the spherical recess 19 is provided with a recess 21 for draining oil that is recessed radially outward from the guide spherical concave surface 20. It is possible to prevent the oil that has entered inside 19 from staying on the guide spherical concave surface 20. However, along with the provision of the concave portion 21, in the initial stage of the returning operation, the outer peripheral edge portion of the axial end surface of a part of the spherical rollers 4 facing the concave portion 21 and the opening peripheral edge portion of the concave portion 21 May be caught. For this reason, in the case of the present embodiment, the pedestal 17 is rotated about the central axis of the outer ring 2 so that the part of the spherical rollers 4 rides on the spherical spherical concave surface 20 without difficulty. Like. If the peripheral edge of the opening of the recess 21 is chamfered, the part of the spherical rollers 4 can run more smoothly onto the guiding spherical concave surface 20.

  Note that the rocking speed of the inner ring assembly 13 by the rocking arm 18 and the rotational speed of the pedestal 17 when the above-described returning operation is performed are centrifugal that are harmful to the returning operation. Set to an appropriate value that does not generate force. Such an appropriate value is obtained by calculation or experiment. For example, with respect to the rocking speed, in the case of a self-aligning roller bearing for an industrial machine such as a rolling mill, it is appropriate that the swinging speed is about 90 degrees / 3 to 4 seconds or slower. The rotational speed of the spherical rollers 4, 4 can be kept low as long as vibration for destabilizing the positional relationship between the spherical rollers 4, 4 and the outer ring 2 can be obtained. This is preferable from the viewpoint of suppressing the friction between the rolling surface and the guide spherical concave surface 20 and preventing the damage of each surface.

The perspective view which shows a pair of press jig | tool used in order to elastically deform an outer ring | wheel in order to perform an insertion process. The bar graph which shows the result of the 1st experiment conducted in order to know the influence which the press position by a pair of press jig | tool has on the magnitude | size of the stress which arises in an outer ring | wheel. The diagram which similarly shows the result of a 2nd experiment. The principal part schematic plan view which shows the Example of the apparatus which performs a return process following an insertion process. The figure equivalent to the AA cross section of FIG. 4 which shows the state which turns this inner ring assembly in order to incorporate an inner ring assembly inside an outer ring. The figure which shows the state which regulates the phase regarding the circumferential direction of this outer ring before elastically deforming an outer ring. The fragmentary sectional view which shows one example of a self-aligning roller bearing. The figure seen from the side of FIG. Sectional drawing which shows the state which brought the inner ring assembly close to this outer ring without elastically deforming the outer ring. The side view which shows the state which inserted the inner ring assembly inside this outer ring | wheel in the state which elastically deformed the outer ring | wheel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Self-aligning roller bearing 2 Outer ring 3 Inner ring 4 Spherical roller 5 Cage 6 Outer ring raceway 7 Inner ring raceway 8 Main part 9 Pocket 10 Outward flange part 11 Elastic tongue piece 12 Recessed part 13 Inner ring assembly 14 Pressing jig 15 End face 16 Inclination Surface 17 Base 18 Oscillating arm 19 Spherical recess 20 Spherical concave surface for guide 21 Recess 22 Rotary actuator 23 Output panel 24 Actuator 25 Output rod 26 Oil passage hole 27 Charge switch

Claims (5)

  An outer ring in which an outer ring raceway that is a spherical concave surface is formed on the inner peripheral surface, an inner ring in which a pair of inner ring races opposed to the outer ring raceway are formed on the outer peripheral surface, and the outer ring raceway and the inner ring raceway in two rows. In order to assemble a self-aligning roller bearing comprising a plurality of spherical rollers provided so as to be freely rollable, and a cage having a plurality of pockets for holding each of these spherical rollers in a freely rollable manner, An inner ring assembly in which the spherical rollers and the cage are combined in advance is pressed inside the outer ring, and the outer ring is pressed in a direction approaching each other at a portion opposite to the diametrical direction. With the major axis of the opening elastically deformed until the inner ring assembly can be inserted, the central axis of the inner ring assembly and the central axis of the outer ring are substantially at the center of curvature of the outer ring raceway. Automatically inserted even in the orthogonal state In the assembling method of the spherical roller bearing, the positions of two positions opposite to each other in the diametrical direction on the outer peripheral surface of the outer ring are totaled by the tip surfaces of the pair of pressing jigs arranged so as to face each other across the outer ring. The four positions are pressed in a direction approaching each other, and the abutting positions of the tip surfaces of the two pressing jigs and the outer peripheral surface of the outer ring are set on both sides in the circumferential direction from the pressing center of the outer ring by the two pressing jigs. A method of assembling a self-aligning roller bearing, characterized in that it is set at a portion deviated by 15 to 30 degrees.   The self-aligning roller bearing assembly method according to claim 1, wherein the front end surfaces of both pressing jigs are V-shaped concave surfaces having an included angle of 120 to 150 degrees.   There are oil passage holes that allow the inner and outer peripheral surfaces of the outer ring to communicate with each other evenly spaced in the circumferential direction of the outer ring, and the center position of the force that presses the outer ring with a pair of pressing jigs is circular. The method of assembling a self-aligning roller bearing according to any one of claims 1 to 2, wherein the assembly method is a position between oil passage holes adjacent in the circumferential direction.   After inserting the inner ring assembly inside the outer ring, the inner ring assembly is swung substantially 90 degrees around the diameter direction of the inner ring assembly and the outer ring, and the inner ring assembly is moved inside the outer ring. When the inner ring assembly is assembled, the inner ring assembly is inserted inside the outer ring until the central axes of the inner ring assembly and the outer ring are substantially orthogonal at the center of curvature of the outer ring raceway. In the state where it is placed on a pedestal having a spherical recess, the spherical rollers constituting the inner ring assembly are guided by the guide spherical concave surface which is the inner surface of the spherical recess, and the inner ring assembly is moved in the diametrical direction. The self-aligning roller bearing assembly according to any one of claims 1 to 3, wherein the self-aligning roller bearing is pivoted to the center so that the central axis of the inner ring assembly substantially coincides with the central axis of the outer ring. Method.   A temporary assembly process in which an inner ring, spherical rollers and a cage are combined in advance to form an inner ring assembly, an insertion process in which the inner ring assembly is inserted inside the outer ring, and the inner ring assembly inserted in the outer ring. 5. A self-aligning roller bearing assembly according to claim 4, wherein the returning step of swinging 90 degrees and causing the center axes of the inner ring assembly and the outer ring to substantially coincide with each other is automatically performed without manual intervention. Method.

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