JP2006266277A - Self-aligning roller bearing with cage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a structure which spherical rollers 3, 3 can be prevented from dropping out, secures wide areas of end openings of rooms where the spherical rollers 3, 3 are installed, enables an efficient feed of lubricant into the rooms, facilitates machining of each component and can suppress a cost rise. <P>SOLUTION: The lengths of pillar sections 8b, 8b constituting a pair of cages 4c, 4c which rotate independently from each other, are set larger than the axial lengths of the spherical rollers 3, 3. Flange-like stop portions 12, 12 engaging with axial outer end faces 14 of the spherical rollers 3, 3 are provided on circumferential side faces at the top ends of the pillar sections 8b, 8b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The self-aligning roller bearing with a retainer according to the present invention is incorporated in a rotation support portion such as a roll of various industrial machine devices such as a paper mill and a steel mill rolling machine in order to support a rotating shaft inside the housing, for example. Use in the state.

  For example, a self-aligning roller bearing with a cage as described in, for example, Patent Documents 1 and 2 has been conventionally used to rotatably support a heavy shaft on the inside of a housing. 4-6 has shown the 1st example of the conventional structure described in patent document 1 among these. This self-aligning roller bearing with a cage is formed by rolling a plurality of spherical rollers 3 and 3 between an outer ring 1 and an inner ring 2 that are concentrically combined with each other. The cage 4 regulates the postures and positions of the plurality of spherical rollers 3 and 3.

  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. Also, a pair of inner ring raceways 6 and 6 are formed on both sides of the outer peripheral surface of the inner ring 2 in the width direction (left and right direction in FIG. 5). 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 is divided into two rows, and a plurality of each row is provided so as to be freely rollable.

  The cage 4 includes one rim portion 7 and a plurality of column portions 8 and 8. Among these, the rim | limb part 7 is cyclic | annular, and is arrange | positioned between the spherical rollers 3 and 3 of said both rows. In addition, each of the column parts 8, 8 is axially connected to the outer ring 1 and the inner ring 2 in a state in which the base end part is coupled to a plurality of circumferentially equidistant portions on both axial sides of the rim part 7. Is arranged. The front ends of the pillars 8 and 8 are free ends that are not coupled to other portions. And the part between the column parts 8 and 8 adjacent to the circumferential direction is made into the pockets 9 and 9 for hold | maintaining each said spherical roller 3 and 3 so that rolling is possible. Further, the outer peripheral surface of the rim portion 7 is brought close to and opposed to the inner peripheral surface of the intermediate portion of the outer ring 1 so as to position the retainer 4 in the radial direction (by the outer ring guide). Further, outward flange-shaped flanges 10 and 10 are formed on the outer peripheral surfaces of both ends of the inner ring 2, and the spherical rollers 3 and 3 are connected to the inner peripheral surface of the outer ring 1 and the outer peripheral surface of the inner ring 2. So that it does not escape axially outward from the space between.

  When the rotating shaft is supported on the inner side of the housing by the self-aligning roller bearing with a cage configured as described above, for example, the outer ring 1 is fitted and fixed to the housing, and the inner ring 2 is fitted and 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. When 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 (the center axis of the inner ring 2 is inclined with respect to the center axis of the outer ring 1). To compensate. In this case, since the outer ring raceway 5 is formed in a single spherical shape, the rolling of the plurality of spherical rollers 3 and 3 is smoothly performed even after the inconsistency compensation.

  In the case of the first example of the conventional structure as described above, the cage 4 for holding the spherical rollers 3 and 3 in both rows is integrated. On the other hand, as shown in FIG. 7, Patent Document 2 describes a structure in which cages 4a and 4a for holding both rows of spherical rollers 3 and 3 are made independent of each other. Also in the case of the second example of this conventional structure, in order to prevent the spherical rollers 3 and 3 from coming out axially outwardly from the space between the inner peripheral surface of the outer ring 1 and the outer peripheral surface of the inner ring 2, The flanges 10 and 10 are formed on the outer peripheral surfaces of the both ends of the inner ring 2.

  Furthermore, in Patent Document 1, as shown in FIG. 8, instead of connecting the tip portions of the pillar portions 8 a, 8 a constituting the cage 4 b with the connecting portions 11, 11, the outer periphery of both end portions of the inner ring 2 a is provided. The structure which does not provide the collar on the surface is described. In the case of the third example having such a conventional structure, the spherical rollers 3 and 3 are connected to the inner peripheral surface of the outer ring 1 based on the engagement between the connecting portions 11 and 11 and the axial end surfaces of the spherical rollers 3 and 3. Is prevented from slipping outward in the axial direction from the space between the inner ring 2 and the outer peripheral surface of the inner ring 2.

In the case of the first to third examples having the conventional structure as described above, it is desired to improve the following points in order to increase the speed of the rotating shaft.
First, in the case of the first and second examples shown in FIGS. 5 and 7, the flanges 10, 10 existing on the outer peripheral surfaces of both ends of the inner ring 2, cause the gap between the inner peripheral surface of the outer ring 1 and the outer peripheral surface of the inner ring 2. The area of the open end of the space is reduced. For this reason, when the lubrication of the rolling contact portions of the rolling surfaces of the spherical rollers 3 and 3 with the outer ring raceway 5 and the inner ring raceways 6 and 6 is performed with oil mist or oil air, the above space is used. The flow rate of the lubricant (lubricating oil) entering is reduced, which is disadvantageous in terms of high speed operation. Further, when the spherical rollers 3 and 3 are assembled in the space, the both flange portions 10 and 10 become an obstacle. For this reason, it is necessary to form notches for allowing the spherical rollers 3 and 3 to pass through a part of both the flange portions 10 and 10, which makes the processing of the inner ring 2 troublesome and is skilled in assembly. Cost.

  In the case of the third example of the conventional structure shown in FIG. 8, since there are no flanges on the outer peripheral surfaces of both ends of the inner ring 2a, the space between the outer peripheral surface of the inner ring 2a and the inner peripheral surface of the outer ring 1 by the flanges. The area of the open end of the is not reduced. However, the area of the opening end of the space is narrowed over the entire circumference of the opening end by the ring-shaped connecting portions 11 and 11 provided in the cage 4b. For this reason, as in the case of the first and second examples described above, the flow rate of the lubricant (lubricating oil) entering the space is reduced, which is disadvantageous in terms of high speed operation.

  In the first and third examples of the conventional structure shown in FIGS. 5 and 8, the radial positioning of the cages 4 and 4 b for holding the spherical rollers 3 and 3 in both rows is determined by the outer circumference of the rim portion 7. Since this is achieved by engaging the surface with the inner peripheral surface of the outer ring 1, there is a disadvantage in increasing the speed of the rotating shaft in the following points. That is, in the case of such a structure, the relative speed (sliding speed) between the outer peripheral surface of the rim portion 7 and the inner peripheral surface of the outer ring 1 is increased, and the friction at the engaging portion between both the peripheral surfaces is large. Become. As a result, the dynamic torque (rotational resistance) of the self-aligning roller bearing with cage and the heat generated by the operation increase, which is disadvantageous in terms of high-speed operation.

  Further, in the case of the first and third examples, since the cages 4 and 4b for holding both rows of spherical rollers 3 and 3 are integrated, the difference in revolution speed between these rows of spherical rollers 3 and 3 is different. As a result, the dynamic torque and the heat generated by the operation are also increased. That is, during operation of the self-aligning roller bearing with cage, the spherical rollers 3 and 3 in both rows may be operated under the same load (under the same conditions). Is operated in a state where a larger load is supported than the other row. As a result, a difference occurs in the revolution speed of the spherical rollers 3 and 3 in both rows. In such a case, if the retainers 4 and 4b holding the spherical rollers 3 and 3 in both rows are integrated, the spherical roller 3 in the row having a high revolution speed is replaced with the spherical roller 3 in the slow row. It will revolve while dragging. In other words, the spherical roller 3 in the row with the slow revolution speed is in a state of applying braking to the revolution motion of the spherical roller 3 in the same fast row. In particular, this tendency becomes remarkable when the vehicle is operated while supporting an axial load. As a result, as described above, dynamic torque and heat generation associated with operation increase.

JP-A-9-317760 Utility Model Registration No. 2524932

In view of the circumstances as described above, the present invention aims to prevent the spherical rollers from coming off and secure a wide area of the end opening of the space in which these spherical rollers are installed, so that the lubricant can be fed into this space. The present invention was invented to realize a structure that can be efficiently performed, and that the constituent members can be easily processed and the cost increase can be suppressed.
Furthermore, the present invention intends to realize a structure that can advantageously perform high-speed operation by keeping dynamic torque and heat generated by the operation low as required.

The self-aligning roller bearing with a retainer of the present invention includes an outer ring, an inner ring, a plurality of spherical rollers, and a retainer in the same manner as the conventional self-aligning roller bearing with a retainer described above. Become.
Among these, the outer ring forms an outer ring raceway having a spherical concave surface on the inner peripheral surface thereof.
Further, the inner ring forms a pair of inner ring raceways opposed to the outer ring raceway on the outer peripheral surface thereof.
Each of the spherical rollers is divided into two rows between the outer ring raceway and the inner ring raceways, and a plurality of spherical rollers are provided so as to be able to roll in each row.
Further, the cage includes a plurality of pockets for holding the spherical rollers in a rollable manner. For this purpose, this retainer has an annular rim portion disposed between the spherical rollers in both rows and a plurality of base end portions connected to a plurality of circumferential positions on the axial side surface of the rim portion. And a plurality of column portions that are arranged in the axial direction of the respective spherical rollers in the state and have respective tip portions as free ends that are not coupled to other portions. And the part between the column parts adjacent to the circumferential direction is made into each said pocket.

In particular, in the self-aligning roller bearing with a retainer of the present invention, the length of each column portion is larger than the axial length of each spherical roller.
Further, a flange-shaped retaining portion that engages with the axial end surface of each spherical roller is provided on the circumferential side surface of the tip portion of each column portion.

  In the case of the self-aligning roller bearing with a retainer of the present invention configured as described above, when each spherical roller is displaced in the axial direction of the outer ring and the inner ring within each pocket, each column portion constituting each of these pockets A hook-shaped retaining portion provided on the side surface in the circumferential direction of the tip of the roller and the axial end surface of each spherical roller engage with each other. For this reason, it is possible to prevent these spherical rollers from coming out of the pockets in the axial direction of the outer ring and the inner ring. Therefore, it is not necessary to form a flange portion on the outer peripheral surface of both end portions in the axial direction of the inner ring or to provide a connecting portion between the tip portions of each column portion. For this reason, the area of the opening edge part of the space between the inner peripheral surface of the said outer ring | wheel and the outer peripheral surface of the said inner ring | wheel can be ensured widely. When the rolling contact portions of the rolling surfaces of the spherical rollers, the outer ring raceway, and the inner ring raceway are lubricated by droplet lubrication, the flow rate of the lubricant (lubricating oil) entering the space is increased to increase the speed. This is advantageous from the aspect of driving. Further, it is not necessary to form flanges on the outer peripheral surfaces of both ends in the axial direction of the inner ring, and the outer diameter of the inner ring can be minimized at both ends in the axial direction of the inner ring. The work of assembling the cage and the plurality of spherical rollers in the space between the peripheral surfaces can be easily performed. Further, the processing of the inner ring is facilitated, and the cost of the self-aligning roller bearing with a cage including the inner ring can be reduced.

When carrying out the present invention, preferably, as described in claim 2, the radial position of the cage is based on the engagement between the circumferential side surfaces of the column portions and the rolling surfaces of the spherical rollers. (Rolling element guidance).
If comprised in this way, the frictional speed of the engaging part for restrict | limiting the radial direction position of the said holder | retainer will be restrained low, and the heat_generation | fever accompanying dynamic torque and driving | operation will be restrained low.

Preferably, when carrying out the present invention, as described in claim 3, a cage for holding one row of spherical rollers, and a cage for holding the other row of spherical rollers; Are independent of each other to allow relative rotation.
If comprised in this way, even when a difference arises in the revolution speed of the spherical roller of both rows, the holder | retainer holding these spherical rollers of both rows will rotate independently. For this reason, a spherical roller in a row with a high revolution speed can drag a spherical roller in a slow row, or a spherical roller in a row with a low revolution speed can apply braking to the revolution motion of a spherical roller in a fast row. Disappear. As a result, the dynamic torque and the heat generated by the operation can be kept low.

1 and 2 show an embodiment of the present invention. The self-aligning roller bearing with a retainer of the present embodiment is similar to the second example of the conventional structure shown in FIG. 7 described above, and the outer ring 1, the inner ring 2a, the plurality of spherical rollers 3, 3 are mutually connected. It consists of a pair of independent cages 4c and 4c (combined so as to be relatively rotatable).
Outer ring 1 of these forms outer ring raceway 5 which is a spherical concave surface having a single center on its inner peripheral surface.
The inner ring 2 a has a pair of inner ring raceways 6, 6 facing the outer ring raceway 5 on the outer peripheral surface thereof. Regarding the inner ring 2a, unlike the second example of the conventional structure, the flanges 10 and 10 (see FIG. 7) are not provided on the outer peripheral surfaces of both ends. The inner ring 2a incorporated in the present embodiment has the same shape as the third example of the conventional structure shown in FIG.
The spherical rollers 3 and 3 are divided into two rows between the outer ring raceway 5 and the inner ring raceways 6 and 6, and a plurality of the spherical rollers 3 and 3 are provided so as to be freely rollable in both rows.

  The cages 4c and 4c are made of a copper-based alloy such as copper or brass (brass) or an iron-based alloy such as stainless steel, and hold the spherical rollers 3 and 3 in a rollable manner. A plurality of pockets 9 and 9 are provided. For this purpose, each of the cages 4c, 4c includes an annular rim portion 7a disposed between the rows of spherical rollers 3, 3 and a plurality of column portions 8b, 8b. Each of the column parts 8b, 8b has the base end part coupled to a plurality of circumferentially equidistant positions on one axial side surface of the rim part 7a (continuously integrated). 3 in the axial direction. In addition, each of the column portions 8b and 8b has a free end that is not coupled to the other end portion. That is, the connecting portion 11 (see FIG. 8) as in the third example of the conventional structure is not provided at the tip of each of the column portions 8b and 8b. And each pocket 9 is a portion surrounded on three sides by the circumferential side surfaces of the column portions 8b, 8b adjacent in the circumferential direction and the one axial side surface of the rim portion 7a.

Particularly, in the case of both retainer 4c, 4c constituting the present embodiment, the column sections 8b, 8b of the length L ₈ larger than the axial length L ₃ of each of spherical rollers 3 ( L ₈ > L ₃ ), and the end portions of the column portions 8 b and 8 b are protruded from the end surfaces of the spherical rollers 3. In this way, hook-shaped retaining portions 12, 12 are provided on both side surfaces in the circumferential direction of the tip end portions of the column portions 8 b, 8 b protruding from the end surfaces of the spherical rollers 3. In addition, at both side edges in the circumferential direction of the retaining portions 12 and 12, recesses in which a portion closer to the middle in the radial direction (vertical direction in FIG. 1) is recessed most in the circumferential direction (front and back direction in FIG. 1). 13 and 13 are formed (the shape of both side edges in the circumferential direction is a concave arc shape substantially concentric with the spherical rollers 3).
Note that the amount of protrusion of each of the retaining portions 12 and 12 (of which the portion that protrudes most in the circumferential direction) is regulated as follows. That is, when each spherical roller 3 is displaced in the axial direction of the outer ring 1 and the inner ring 2 a in each pocket 9, it can be engaged with at least a part of the axial outer end surface 14 of each spherical roller 3. The size is regulated. Specifically, the size of the self-aligning roller bearing with cage, the material of the retaining portions 12 and 12 (the cages 4c and 4c), the diameter of the outer end surface 14 in the axial direction of the spherical rollers 3 and the like. Designed according to the relationship. However, a desired gap (opening) is provided between the retaining portions 12 and 12 adjacent to each other (facing each other) in the circumferential direction (as large as possible as long as each spherical roller 3 can be retained). Thus, both the retaining portions 12, 12 adjacent to each other in the circumferential direction are discontinuous.

In the case of the self-aligning roller bearing with a cage of the present embodiment configured as described above, even if the spherical rollers 3 are displaced in the axial directions of the outer ring 1 and the inner ring 2a in the pockets 9, respectively. The spherical rollers 3 do not come out of the pockets 9. That is, the axial outer end surfaces 14 of the spherical rollers 3 and the retaining portions 12, 12 are engaged with each other so that the spherical rollers 3 are placed in the pockets 9 in the outer ring 1 and the inner ring. It is possible to prevent displacement by preventing further displacement in the axially outward direction of 2a. Therefore, as in the first and second examples of the conventional structure shown in FIGS. 5 and 7, the flanges 10 and 10 are formed on the outer peripheral surfaces of the both ends in the axial direction of the inner ring 2, or as shown in FIG. As in the third example of the conventional structure, there is no need to provide the annular connecting portion 11 between the tip portions of the column portions 8a. For this reason, the area of the open end of the space between the inner peripheral surface of the outer ring 1 and the outer peripheral surface of the inner ring 2a can be secured widely. When the rolling contact portions between the rolling surfaces of the spherical rollers 3 and 3 and the outer ring raceway 5 and the inner ring raceways 6 and 6 are lubricated by droplet lubrication, a lubricant (lubricant) entering the space is used. This is advantageous in terms of high speed operation by increasing the oil flow rate.
In this embodiment, the recesses 13 are formed in the retaining portions 12 so that the retaining portions 12 and the axially outer end surfaces 14 of the spherical rollers 3 rub against each other. As well as reducing the area, the lubricant is easily incorporated.

  Further, it is not necessary to form flanges on the outer peripheral surfaces of both ends of the inner ring 2a in the axial direction, and the outer diameter of the inner ring 2a can be made the smallest at both end portions in the axial direction of the inner ring 2a. In the space between the outer ring 1 and the inner peripheral surface of the outer ring 1, it is possible to easily assemble the retainers 4 c and 4 c and the plurality of spherical rollers 3 and 3. Further, the machining operation of the inner ring 2a is facilitated, and the cost of the self-aligning roller bearing with a cage including the inner ring 2a can be reduced.

  Further, in the case of the present embodiment, the radial positions of the two cages 4c and 4c are set so that the circumferential side surfaces of the pillars 8b and 8b are engaged with the rolling surfaces of the spherical rollers 3. This is performed by so-called rolling element guidance that is regulated based on the above. That is, at least a part of each of the both side surfaces in the circumferential direction of each of the column portions 8b, 8b is brought into sliding contact with or in close proximity to the rolling surface of each of the spherical rollers 3, so that the diameters of both the cages 4c, 4c The direction position does not move greatly. Accordingly, the outer peripheral surface of the rim portion 7a is sufficiently separated from the inner peripheral surface of the outer ring 1, and the inner peripheral surface is also sufficiently separated from the outer peripheral surface of the inner ring 2a. In the case of the present embodiment, with such a configuration, the friction speed of the engaging portion for restricting the radial position of the two cages 4c, 4c is kept low, and the self-aligning roller bearing with cage is reduced. The dynamic torque and the heat generated by the operation are kept low.

  In the case of the present embodiment, as described above, the cage 4c for holding the spherical roller 3 in one row and the cage 4c for holding the spherical roller 3 in the other row are as follows. Since the relative rotations are made independent from each other, even when a difference occurs in the revolution speed of the spherical rollers 3 and 3 in both rows, the both cages 4c holding the spherical rollers 3 and 3 in both rows are held. 4c rotate independently of each other. For this reason, the spherical roller 3 in the row with the fast revolution speed drags the spherical roller 3 in the slow row, or the spherical roller 3 in the row with the slow revolution speed brakes the revolution motion of the spherical roller 3 in the fast row. Will not be added. As a result, the dynamic torque of the self-aligning roller bearing with cage and the heat generated by the operation can be kept low.

FIG. 3 shows a self-aligning roller bearing with a cage constructed according to the first example of the conventional structure shown in FIGS. 4 to 6 described above, and with the cage of the embodiment of the present invention having the above-described construction. The result of the experiment conducted in order to know the difference of the calorific value which arises at the time of operation with a self-aligning roller bearing is shown. In the experiment, a self-aligning roller bearing with a cage number 22310 (outer diameter = 110 mm, inner diameter = 50 mm, width = 40 mm) was used. Such a spherical roller bearing with a cage was loaded with a pure radial load of 9.8 kN (1000 kgf) and operated under forced lubrication with lubricating oil (VG68) (the inner ring was rotated). Operating ^{speed, 1500min -1, 3000min -1, 6000min} -1, 7800min -1, was changed to 5 kinds of 9700min ^-1.

  The result of the experiment conducted under such conditions is shown in FIG. As is apparent from FIG. 3, the temperature rise during operation of the self-aligning roller bearing with cage of the present embodiment can be suppressed lower in the entire operating speed than the temperature rise of the conventional self-aligning roller bearing with cage. . From this fact, it is apparent that the present invention is advantageous in increasing the speed of various mechanical devices incorporating a self-aligning roller bearing with a cage.

The half part sectional view showing the example of the present invention. The partial perspective view which similarly takes out and shows a holder | retainer. The diagram which shows the result of the experiment conducted in order to confirm the effect of this invention. The front view which shows the 1st example of a conventional structure. The expanded AA sectional view of FIG. The partial perspective view which takes out and shows the holder | retainer integrated in the 1st example of the conventional structure. The fragmentary sectional view which shows the 2nd example of a conventional structure. The fragmentary sectional view which shows the 3rd example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2, 2a Inner ring 3 Spherical roller 4, 4a, 4b, 4c Cage 5 Outer ring raceway 6 Inner ring raceway 7, 7a Rim part 8, 8a, 8b Column part 9 Pocket 10 collar part 11 Connection part 12 Retaining part 13 Concave part 14 Axial outer end face

Claims (3)

  An outer ring raceway having a spherical concave surface, an outer ring formed on the inner peripheral surface thereof, a pair of inner ring races opposed to the outer ring raceway, an inner ring formed on the outer peripheral surface thereof, and between the outer ring raceway and the inner ring raceway. Divided into two rows, a plurality of spherical rollers are provided for each row, and a retainer having a plurality of pockets for holding each spherical roller in a freely rollable manner. The vessel has an annular rim portion disposed between the spherical rollers in both rows, and each spherical surface in a state where the respective base end portions are coupled to a plurality of circumferential positions on the axial side surface of the rim portion. A plurality of column portions arranged in the axial direction of the rollers and having respective tip portions as free ends that are not coupled to other portions, and the portions between the column portions adjacent to each other in the circumferential direction as the respective pockets In the self-aligning roller bearing with cage, the length of each of these pillars is It is larger than the axial length of each spherical roller, and has a hook-shaped retaining portion that engages the axial end surface of each spherical roller on the circumferential side surface of the tip of each column portion. Self-aligning roller bearing with cage.   The self-aligning roller with a cage according to claim 1, wherein a radial position of the cage is regulated based on engagement between both circumferential side surfaces of each column and a rolling surface of each spherical roller. bearing.   The holder for holding one row of spherical rollers and the holder for holding the other row of spherical rollers are independent of each other so as to be capable of relative rotation. Self-aligning roller bearing with cage as described in item 1.

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