JP2008151315A - Retainer for automatic aligning roller bearing and automatic aligning roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retainer for an automatic aligning roller bearing increased in the accommodating number of spherical rollers. <P>SOLUTION: The retainer 15 for the automatic aligning roller bearing includes a pair of rings 17, 18, a pair of protuberances 17a, 18a which protrude so as to mutually face from respective ends of the pair of rings 17, 18 and a pillar 19 which connects the pair of rings 17, 18 to each other. In addition, the retainer has a pocket which houses a spherical roller 14 between at least one pair of the protuberances 17a, 18a and the pillar part 19. Then, the thickness dimension L<SB>1</SB>in the circumferential direction of the pillar 19 and the thickness dimension L<SB>2</SB>in the circumferential direction of the protuberances 17a, 18a satisfy L<SB>1</SB>>L<SB>2</SB>. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a self-aligning roller bearing, and more particularly to a self-aligning roller bearing used in a low-speed, high-load environment.

  A conventional self-aligning roller bearing 111 is described in, for example, Japanese Patent Application Laid-Open No. 2006-71031 (Patent Document 1). Referring to FIG. 6, a self-aligning roller bearing 111 described in the publication includes an inner ring 112, an outer ring 113, and a plurality of spherical rollers 114 arranged in a double row between the inner ring 112 and the outer ring 113. And a retainer 115 that retains the interval between the adjacent spherical rollers 114.

  Referring to FIG. 7, retainer 115 has a ring portion and a column portion 115a protruding from the end surface of the ring portion, and pocket 115b for accommodating spherical roller 114 is formed between adjacent column portions 115a. Yes. The column portion 115a extends in the radial direction across the pitch circle of the spherical roller 114, and has a function of preventing the spherical roller 114 from coming off in the radial direction and keeping the interval between the adjacent spherical rollers 114 constant.

The self-aligning roller bearing 111 configured as described above is a bearing that has a large load capacity in structure and is suitable for use in an environment that receives heavy loads, vibrations, impact loads, and the like. Moreover, it has alignment with respect to the bending of the rotating shaft, and is widely used in, for example, construction machinery, steel facilities, general industrial machinery (hereinafter referred to as “construction machinery”).
JP 2006-71031 A

  In recent years, there has been an increasing demand for higher output and more compact construction machines. When the construction machine or the like is increased in output, the load applied to the self-aligning roller bearing 111 increases. Thereby, in the conventional self-aligning roller bearing 111, a decrease in bearing life due to insufficient load capacity becomes a problem. This problem is not limited to the case where the construction machine or the like is increased in output, but may also occur when the self-aligning roller bearing 111 having the same load condition as that of the conventional machine is to be made compact.

  The simplest method for handling high loads is to enlarge the self-aligning roller bearing 111, but it is against the demand for compactness. Therefore, it is desirable to increase the load capacity while maintaining the bearing size of the self-aligning roller bearing 111.

  As a method of increasing the load capacity of the self-aligning roller bearing 111, it is conceivable to increase the diameter of the spherical roller 114. However, the main dimensions (dimension series) of the bearing are defined by JIS, ISO, etc., and may not be freely changed.

  Another method for increasing the load capacity is to increase the number of spherical rollers 114. However, the pillar portions 115a of the cage 115 are arranged on the left and right sides of the spherical rollers 114, and the thickness of the pillar portions 115a needs to be a certain value or more from the viewpoint of securing the strength of the pillar portions 115a. As a result, it has been difficult to increase the number of spherical rollers 114 that can be accommodated by reducing the interval between adjacent spherical rollers 114.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a self-aligning roller bearing cage having an increased number of spherical rollers, and a compact and high load capacity self-aligning roller bearing employing such a cage. is there.

A cage for a self-aligning roller bearing according to the present invention includes a pair of ring portions, a pair of convex portions protruding so as to face each other from the end faces of the pair of ring portions, and a column connecting the pair of ring portions to each other. And a pocket for accommodating the spherical roller is formed between at least the pair of convex portions and the column portion. Then, the circumferential direction of the thickness _{L 1} of the pillar portion, and the circumferential direction of the thickness _{L 2} of the convex _portion, satisfy L 1> _{L 2.}

Compared with the column part which functions as a strength member, the convex part can reduce the thickness dimension in the circumferential direction (L ₁ > L ₂ ). As a result, the interval between the spherical rollers adjacent to each other with the convex portion interposed therebetween can be reduced, so that the number of rollers that can be accommodated increases.

  Further, by providing at least one column portion for connecting the pair of ring portions to each other, the spherical roller bearing retainer can be handled as a unit. As a result, the assemblability of the self-aligning roller bearing is improved.

  Preferably, A <B is satisfied, where A is the protrusion amount of the convex portion and B is the distance from the end surface of the spherical roller accommodated in the pocket to the maximum diameter portion. Thereby, since the tip of the convex portion does not reach a position where the interval between the adjacent spherical rollers is minimized, the interval between the adjacent spherical rollers can be reduced. As a result, it becomes possible to accommodate more spherical rollers.

  Preferably, the central region of the column portion facing the largest diameter portion of the spherical roller accommodated in the pocket is located below the pitch circle of the spherical roller. By disposing the column portion in a region deviating from the pitch circle at a position facing the maximum diameter portion of the spherical roller, the interval between the adjacent spherical rollers can be reduced. As a result, it becomes possible to accommodate more spherical rollers.

  Preferably, the pair of convex portions and the column portions are alternately arranged in the circumferential direction of the pair of ring portions. The load capacity is relatively small at a position where the distance between adjacent spherical rollers is large, and the load capacity is relatively large at a position where the distance is small. Thus, by alternately arranging the convex portions and the column portions, the load capacity in the circumferential direction can be made uniform as a whole of the self-aligning roller bearing.

  In the present specification, “alternately arrange” means that the convex portions and the column portions are arranged according to a certain rule. That is, it should be understood as including not only the case where the convex portions and the column portions are arranged at a ratio of 1: 1, but also the case where they are arranged at a ratio of 2: 1 or 3: 1.

  A self-aligning roller bearing according to the present invention includes an inner ring, an outer ring, a plurality of spherical rollers arranged between the inner ring and the outer ring, and the self-aligning roller according to any one of the above, which maintains an interval between adjacent spherical rollers. A retainer for the center roller bearing.

  By employing the cage having the above-described configuration, a self-aligning roller bearing having a large load capacity while maintaining the bearing size can be obtained. In addition, when the load capacity is the same as the conventional one, a more compact self-aligning roller bearing can be obtained.

  According to this invention, a self-aligning roller bearing having a large load capacity can be obtained while maintaining the bearing size by mixing the pair of convex portions and the column portion between the pair of ring portions. .

  With reference to FIGS. 1-5, the self-aligning roller bearing 11 which concerns on one Embodiment of this invention is demonstrated. FIG. 1 is a view showing a self-aligning roller bearing 11. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1 and shows the cage 15 as viewed from the radial direction. 3 is a cross-sectional view taken along the line III-III in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 1, showing the shape of the end region of the column part 19. FIG. 5 is a cross-sectional view taken along the line V-V of FIG.

  First, referring to FIG. 1, a self-aligning roller bearing 11 includes an inner ring 12, an outer ring 13, a plurality of spherical rollers 14 arranged in a double row between the inner ring 12 and the outer ring 13, and adjacent spherical rollers. 14 are provided with spherical roller bearing retainers 15 and 16 (hereinafter simply referred to as “retainers”). The inner ring 12 has two rows of inner ring raceway surfaces 12a and 12b on the outer diameter surface thereof. The outer ring 13 has a spherical outer ring raceway surface 13a facing the inner ring raceway surfaces 12a and 12b on the inner diameter surface thereof.

  The spherical roller 14 is a rolling element of a barrel shape as a whole having a curved rolling surface 14a constituting a part of a sphere and both planar end surfaces 14b. The spherical roller 14 is a symmetric roller in which the maximum diameter position is located at the center of the roller length. A plurality of the spherical rollers 14 are arranged on each of the left and right inner ring raceway surfaces 12a and 12b, and roll between the inner ring raceway surfaces 12a and 12b and the outer ring raceway surface 13a.

  Next, the retainer 15 will be described in detail with reference to FIGS. In addition, since the holder | retainer 16 is the same structure, description is abbreviate | omitted.

  First, referring to FIG. 2, the cage 15 includes a pair of ring portions 17, 18, a pair of convex portions 17 a, 18 a that protrude from the end surfaces of the pair of ring portions 17, 18 so as to face each other, and a pair The ring portions 17 and 18 are connected to each other and a column portion 19 that connects the ring portions 17 and 18 to each other.

  The ring portions 17 and 18 are annular members, and are disposed along the outer diameter surface of the inner ring 12. In the embodiment shown in FIG. 1, the ring portion 17 is disposed on the axial center portion side of the inner ring 12, and the ring portion 18 is disposed on the axial end portion side.

  The pair of convex portions 17 a and 18 a and the column portion 19 are disposed at substantially equal intervals in the circumferential direction of the pair of ring portions 17 and 18. In the embodiment shown in FIG. 2, the convex portions 17a, 18a and the column portions 19 are alternately arranged at a ratio of 1: 1. A pocket 20 that accommodates the spherical roller 14 is formed between the pair of convex portions 17 a and 18 a and the column portion 19.

Further, assuming that the thickness dimension in the circumferential direction of the column part 19 is L ₁ and the thickness dimension in the circumferential direction of the convex part 17 a is L ₂ , it is set so as to satisfy L ₁ > L ₂ . Note that the same relationship holds for the circumferential thickness dimension of the convex portion 18a and the column portion 19.

  By providing the column part 19 which connects the pair of ring parts 17 and 18 to each other at least in one place, the cage 15 can be handled as a unit. As a result, the assembling property of the self-aligning roller bearing 11 is improved, for example, the spherical roller 14 can be prevented from falling off during assembly or repair.

  Moreover, since the column part 19 functions as a strength member that holds the shape of the cage 15, the strength of the cage 15 is improved. As a result, troubles in the self-aligning roller bearing 11 due to breakage of the cages 15 and 16 can be prevented. This has an advantageous effect for the self-aligning roller bearing 11 used in a place where it is very difficult to replace the bearing, such as plant equipment including steel equipment.

  The spherical roller 14 accommodated in the pocket 20 has a maximum diameter portion located in the central region in the length direction, and the roller diameter becomes smaller as it approaches both ends. Therefore, the pillar part 19 has a narrow central region, and becomes thicker as it approaches both ends.

Here, the pillar portion 19 which functions as a strength member for holding the shape of the retainer 15, the circumferential direction of the thickness dimension L ₁ can not be too small. On the other hand, the convex portion 17a, 18a can be reduced thickness _{L 2} as compared with the pillar portion _{19 (L 1> L 2)} .

  That is, the interval between the spherical rollers 14 adjacent to each other with the convex portions 17a and 18a interposed therebetween is smaller than the interval between the spherical rollers 14 adjacent to each other with the column portion 19 interposed therebetween. As a result, the number of spherical rollers 14 that can be accommodated as the entire cage 15 increases.

  Further, assuming that the protrusion amount of the convex portion 17a is A and the distance from the end surface of the spherical roller 14 (shown by a broken line in FIG. 2) accommodated in the pocket 20 to the maximum diameter portion is B, A <B is satisfied. . A similar relationship is established between the convex portion 18a and the spherical roller 14.

  The spacing between adjacent spherical rollers 14 is minimized at the maximum diameter portion of the spherical rollers 14. Therefore, the interval between the adjacent spherical rollers 14 can be reduced by preventing the tips of the convex portions 17 a and 18 a from reaching the position facing the maximum diameter portion of the spherical rollers 14. As a result, a larger number of spherical rollers 34 can be accommodated, so that the self-aligning roller bearing 11 having a large load capacity while maintaining the bearing size can be obtained.

  Next, referring to FIGS. 3 and 4, the end region of the column portion 19 extends in the radial direction so as to straddle the pitch circle c of the spherical roller 14, and the radial outer side and the radial direction of the spherical roller 14. Prevent falling out. In this embodiment, the radial height on the side close to the ring portion 17 of the column portion 19 is set to be higher than the radial height on the side close to the ring portion 18.

  Further, the wall surface of the column portion 19 facing the spherical roller 14 has a curved shape along the rolling surface of the spherical roller 14 and functions as a guide surface for guiding the rotation of the spherical roller 14. In addition, since the convex parts 17a and 18a are the same structures, detailed description is abbreviate | omitted.

  Next, referring to FIG. 5, the central region of the column portion 19 facing the largest diameter portion of the spherical roller 14 accommodated in the pocket 20 is located below the pitch circle c of the spherical roller 14. In the self-aligning roller bearing 11, the interval between the adjacent spherical rollers 14 is minimized on the pitch circle c. Therefore, the interval between the adjacent spherical rollers 14 can be reduced by disposing the column portion 19 in a region outside the pitch circle c. As a result, a larger number of spherical rollers 14 can be accommodated, so that the self-aligning roller bearing 11 having a large load capacity while maintaining the bearing size can be obtained.

  The cage 15 having the above-described configuration increases the number of spherical rollers 14 that can be accommodated by reducing the thickness of the convex portions 17a and 18a in the circumferential direction while maintaining the strength of the column portion 19 as a strength member. Yes. As a result, troubles such as breakage of the cage 15 can be prevented, and the self-aligning roller bearing 11 having a high load capacity can be obtained.

  In the above embodiment, the example in which the convex portions 17a and 18a and the column portion 19 are alternately arranged at a ratio of 1: 1 is shown. However, the present invention is not limited thereto, and an arbitrary ratio (2: 1 3: 1 etc.). In this case, pockets for accommodating the spherical rollers are also formed between the convex portions adjacent in the circumferential direction or between the column portions adjacent in the circumferential direction.

  In the above embodiment, an example in which the central region of the pillar portion 19 is disposed below the pitch circle c of the spherical roller 14 has been described. However, from the viewpoint of reducing the interval between the adjacent spherical rollers 14, The part 19 may be arranged at a position deviating from the pitch circle c, that is, above the pitch circle c.

  In the above embodiment, the cages 15 and 16 are separated on the left and right sides and can be rotated independently of each other. Also good.

  Moreover, arbitrary materials and a manufacturing method can be employ | adopted for the holder | retainers 15 and 16 in said embodiment. For example, it may be a resin cage in which a resin material is injection-molded, a press cage produced by pressing a steel plate, or a squeezed cage produced by cutting a metal. There may be.

  Further, the spherical roller 14 in the above embodiment is an example of a symmetric roller in which the maximum diameter position exists in the center in the length direction of the roller. However, the present invention is not limited to this, and the maximum diameter position of the roller is An asymmetric roller that does not exist in the center in the length direction may be used.

  Further, the cage 15 in the above embodiment is not limited to the self-aligning roller bearing 11 shown in FIG. 1, and can be employed in any form of self-aligning roller bearing. For example, the present invention can also be applied to a self-aligning roller bearing having a center between right and left raceway surfaces, or a self-aligning roller bearing in which guide wheels are disposed between left and right raceway surfaces.

  Furthermore, the self-aligning roller bearing 11 having the above-described configuration is expected to improve the durability of construction machinery and the like and reduce maintenance costs by using it for applications such as construction machinery, steel equipment, and general industrial machinery. it can. Moreover, since the bearing size can be reduced if the load applied to the bearing is about the same as the conventional load, the construction machine or the like can be made compact. Furthermore, it is possible to obtain a construction machine capable of reducing friction and heat generation during rotation of the bearing and reducing CO2 emission to the atmosphere.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The present invention is advantageously used for a self-aligning roller bearing.

It is a figure which shows the self-aligning roller bearing which concerns on one Embodiment of this invention. It is sectional drawing in II-II of FIG. It is sectional drawing in III-III of FIG. It is sectional drawing in IV-IV of FIG. It is sectional drawing in VV of FIG. It is a figure which shows the conventional self-aligning roller bearing. It is sectional drawing in VII-VII of FIG.

Explanation of symbols

  11,111 Spherical roller bearing, 12,112 Inner ring, 12a, 12b Inner ring raceway surface, 13,113 Outer ring, 13a Outer ring raceway surface, 14,114 Spherical roller, 14a Rolling surface, 14b End face, 15, 16, 115 Cage, 17, 18 Ring part, 17a, 18a, 115a Convex part, 19 Pillar part, 20, 115b Pocket.

Claims (5)

A pair of ring portions;
A pair of convex portions projecting from the end faces of the pair of ring portions so as to face each other;
A column portion connecting the pair of ring portions to each other;
A pocket for accommodating the spherical roller is formed at least between the pair of convex portions and the column portion,
Wherein a thickness L ₁ of the circumferential direction of the pillar portion, said A thickness L ₂ of the circumferential direction of the convex portion, L _1> satisfy L _2, cage for self-aligning roller bearings.   The self-aligning roller bearing according to claim 1, wherein A <B is satisfied, where A is a protrusion amount of the convex portion and B is a distance from an end surface of the spherical roller accommodated in the pocket to the maximum diameter portion. Cage.   The cage for a self-aligning roller bearing according to claim 1 or 2, wherein a central region of the column portion facing the largest diameter portion of the spherical roller accommodated in the pocket is located below the pitch circle of the spherical roller. .   The self-aligning roller bearing retainer according to any one of claims 1 to 3, wherein the pair of convex portions and the column portions are alternately arranged in a circumferential direction of the pair of ring portions. Inner ring,
Outer ring,
A plurality of spherical rollers disposed between the inner ring and the outer ring;
A self-aligning roller bearing comprising the self-aligning roller bearing retainer according to any one of claims 1 to 4, which retains an interval between adjacent spherical rollers.

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