JP6141606B2 - Spherical roller bearing - Google Patents

Description

  The present invention relates to a self-aligning roller bearing suitable for use in a device that receives a rotational load or a vibration impact load such as a vibrating screen, a mining machine, and a crusher.

  In a self-aligning roller bearing, a double-row spherical roller is assembled between the spherical race formed on the inner circumference of the outer ring and the opposing portion of the double-row spherical race formed on the outer circumference of the inner ring. Is held by a cage.

  Here, as a cage for holding the double-row spherical rollers, a plurality of pillars extending in the axial direction on one side surface or both side surfaces of the annular body guided by the outer ring are provided in a comb shape with spacing between the spherical rollers. Although this type of cage retainer is weak in strength and is used in a state where it receives a large rotational load, the impact force applied from the spherical roller to the column due to the delayed advancement of the spherical roller. May cause damage to the pillars.

  In addition, since the annular body is a one-point support in which the outer ring is guided, the stability of the cage and the spherical roller is poor, and there is a possibility that the cage will be rattled during rotation to generate noise.

  Furthermore, in order to prevent the spherical rollers from falling off in the direction of the tip of the column part, it is necessary to provide flanges at both ends of the outer periphery of the inner ring to prevent the fall off. And poor lubrication is likely to occur.

  In order to eliminate such inconvenience, in the self-aligning roller bearing described in Patent Document 1, shafts are provided on both axial sides of the central annular body guided by the outer ring through the opposing portions of the double row spherical rollers. A plurality of column portions extending in the direction are provided at intervals of the spherical roller, and a pocket row in which an outer annular body is integrated at the outer end of the column portion holds the spherical roller by a double row cage retainer. Yes.

  By adopting the cage-type cage as described above, it is possible to eliminate the need for forming a flange portion that prevents the spherical roller from dropping off, and thus a self-aligning roller bearing having excellent lubricity can be obtained. Further, since the cage is cage-shaped, it is possible to obtain a self-aligning roller bearing that has higher strength than a comb cage and can receive a large rotational load or vibration impact load.

JP-A-9-317760

  By the way, in the cage type cage in the spherical roller bearing described in Patent Document 1, since the pocket row is a double row, the machining is difficult and the cost is high, and it is improved in reducing the cost. The power points are left.

  Further, in order to stabilize the posture of the cage and the spherical roller, the opposed end surfaces of the double row spherical rollers are brought into contact with the inner ring side, and both side surfaces of the central annular body guided by the outer ring are supported by the opposed end surfaces of the spherical rollers. There is a need. For this reason, the central annular body has a cross-sectional V shape that gradually decreases in thickness from the outer peripheral part toward the inner peripheral part, and is weak in strength. Since it must be larger than the diameter, the strength of the outer annular body is low, and there are still points to be improved in increasing the strength of the cage.

  An object of the present invention is to reduce the cost of a cage in a self-aligning roller bearing and to increase the strength.

  In order to solve the above problems, in the present invention, an outer ring having a spherical track on the inner periphery, an inner ring having a double row spherical track on the outer periphery, a double row spherical track of the inner ring, and a spherical surface of the outer ring. In a self-aligning roller bearing comprising a double-row spherical roller incorporated between the raceways and a cage for holding the double-row spherical roller, the cage holds two spherical rollers for each row. It consists of a single row roller cage, and each of the two single row roller cages includes a central annular body guided by an outer ring, an outer annular body guided by an inner ring, and an outer annular body and a central annular body. Formed in a plurality of pillar portions that are provided between the opposing portions and spaced apart by spherical rollers in the circumferential direction, and are formed into a cage shape in which a pocket for accommodating rollers is formed between adjacent pillar portions. , The two single row roller cages, the central annular body is mutually It was adopted a configuration in which a built-in that direction.

  As described above, the cage that holds the double-row spherical rollers is the two single-row roller cages that support the spherical rollers in each row, and the center that is guided by the outer ring to each of the single-row roller cages. By providing the side annular body and the outer annular body guided by the inner ring, each of the single row roller cages is supported at two positions in the axial direction, and the posture is stabilized and rattling occurs. There is no.

  The single row roller retainer is a pocket row in which a plurality of column portions are provided in the circumferential direction between opposed portions of the center side annular body and the outer ring body, and pockets for accommodating spherical rollers are provided between adjacent column portions. Since it is a single-row cage shape, it can be easily processed as compared with a cage-type cage in which pocket rows are double rows.

  Further, by making each of the two single row roller cages into a cage with a single row of pockets, it is not necessary to contact the opposing end surfaces of the double row spherical rollers, and the opposing surfaces of the double row spherical rollers are eliminated. A wide accommodation space can be secured in between, and the central annular body accommodated in the accommodation space can be thick. Further, since the outer ring body is guided by the inner ring, the inner diameter of the outer ring body can be made small with a diameter substantially equal to the minimum outer diameter of the inner ring.

  In this way, the central annular body can be made thick, while the outer annular body can have a small inner diameter, so that it can be a highly strong and highly durable cage. .

  Here, a plurality of retaining protrusions that prevent the spherical rollers accommodated in the pockets from falling out to the outside in the cage radial direction are spaced apart in the length direction of the pillars on the side facing the pockets of the pillars. If it is provided, the spherical roller can be prevented from coming off at the wide circumferential portion of the column portion where the width dimension gradually decreases from both ends toward the center in the length direction, thus preventing damage to the column portion. Can be effective. Further, the movement of the spherical roller can be effectively suppressed.

  Moreover, if the column part is provided with a plurality of bent parts that bend to the outer diameter side of the cage, the strength of the column part can be increased, and a cage having excellent durability can be obtained. In addition, when a spherical surface is formed on the outer periphery of the column portion, the column portion can be thickened, and a cage excellent in strength and durability can be obtained.

  Further, when an oil groove extending in the radial direction of the cage is provided on the outer surface of the center side annular body of the two single row roller cages that relatively rotate in contact with each other, lubrication supplied into the bearing by the oil groove is provided. Since the oil can be held and the outer side surfaces of the central annular body that are in contact with each other and rotate relative to each other can be lubricated by the lubricating oil, wear of the outer side surface can be suppressed.

  In the self-aligning roller bearing according to the present invention, when the material of the cage for single row rollers is brass, the cage is easily processed, the cost is reduced, and wear and galling are suppressed by self-lubricating properties. Can do.

  When the single row roller cage is made of iron, a cage having high strength can be obtained. If the iron single row roller cage is subjected to surface hardening treatment such as soft nitriding, shot blasting, diamond-like carbon (DLC) coating, hard chrome plating, etc., a higher strength cage can be obtained. Can do.

  In addition, when the iron single row roller cage is subjected to lubrication treatment such as phosphate treatment or silver plating treatment, wear and galling can be suppressed.

  In this invention, as described above, the cage that holds the double row spherical rollers incorporated between the outer ring and the inner ring is two cages for single row rollers that support the spherical rollers for each row, Each single row roller cage is provided with a center side annular body guided by the outer ring and an outer annular body guided by the inner ring, so that each of the single row roller cages is supported at two axial positions. Therefore, it is possible to obtain a stable built-in state that does not cause backlash.

  The single row roller retainer is a pocket row in which a plurality of column portions are provided in the circumferential direction between opposed portions of the center side annular body and the outer ring body, and pockets for accommodating spherical rollers are provided between adjacent column portions. Since a single-row cage is used, a cage can be obtained that is easier to process and cheaper than a cage cage having a double row of pocket rows.

  Further, by making each of the two single row roller cages into a cage shape with a single row of pocket rows, the central annular body can be made thick, and the outer annular body has a small inner diameter. Therefore, it is possible to provide a cage having high strength and durability.

Sectional view of the spherical roller bearing according to the present invention The top view which shows a part of two cages for single row rollers shown in FIG. Sectional view along line III-III in FIG. Sectional view showing another example of spherical roller bearing Sectional view showing still another example of self-aligning roller bearing Sectional view showing still another example of self-aligning roller bearing

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show an embodiment of a self-aligning roller bearing according to the present invention. This self-aligning roller bearing A includes an outer ring 11, an inner ring 21 incorporated inside the outer ring 11, a spherical roller 31 incorporated between the two wheels 11, 21, and a cage C that holds the spherical roller 31. ₀ .

The outer ring 11 has a spherical raceway 12 on the inner periphery, and an oil supply hole 13 that penetrates the spherical raceway 12 from an outer diameter surface is formed. On the other hand, the inner ring 21 has a double-row spherical raceway 22 on the outer periphery, and a plurality of spherical rollers 31 arranged at equal intervals in the circumferential direction between each of the double-row spherical raceways 22 and the spherical raceway 12 of the outer ring 11. incorporated in the column, a plurality of spherical rollers 31 of each row are retained by a retainer C _0.

The cage C ₀ includes two single row roller cages C ₁ and C ₁ that hold the spherical rollers 31 for each row. Each of the two single-row roller cages C ₁ and C ₁ includes a plurality of column portions 43 extending in the axial direction between the opposed portions of the center side annular body 41 and the outer side annular body 42 with a space between the spherical rollers 31. It is formed in a cage shape in which pockets 44 are provided between the adjacent column portions 43 to accommodate the spherical rollers 31 provided at equal intervals in the circumferential direction.

  The central annular body 41 has a guide surface 45 guided on the outer ring on the outer periphery, while the outer annular body 42 has a guide surface 46 guided on the inner ring on the inner periphery.

  The pillar portion 43 is provided with a retaining protrusion 47 on the side surface facing the pocket 44, and the retaining protrusion 47 is formed between the retaining protrusion 47 formed on the side surface of the adjacent pillar portion 43 and the cage periphery. The distance between the opposing surfaces is made smaller than the diameter of the spherical roller 31 at the central portion in the length direction to prevent the spherical roller 31 from slipping out to the outer diameter side of the cage.

The two single row roller cages C ₁ and C ₁ are assembled so that the central annular body 41 faces each other, and the side surfaces in the axial direction are in contact with each other. In the assembled state, the outer circumferential guide surface 45 of the central annular body 41 is guided by the spherical raceway 12 of the outer ring 11, and the inner circumferential guide surface 46 of the outer annular body 42 is guided by the spherical raceway 22 of the inner ring 21. It has become so.

  A plurality of radially extending oil grooves 48 are formed on the side surfaces of the central annular body 41 that are in contact with each other at intervals in the circumferential direction, and lubrication is supplied from the oil supply holes 13 formed in the outer ring 11 into the bearing. The oil is held in the oil groove 48 and lubricates the side surfaces of the central annular body 41 that rotate relative to each other.

The self-aligning roller bearing shown in the embodiment has the above-described structure. In the self-aligning roller bearing, as described above, the cage C ₀ that holds the double-row spherical rollers 31 is provided for each row. As the two single row roller cages C ₁ that support the spherical rollers 31, the single row roller cage C ₁ has a center side annular body 41 guided by the outer ring and an outer annular body 42 guided by the inner ring, respectively. because are provided, each of the single-row roller portion retainer C ₁ and is supported at two points in the axial stability.

Therefore, during rotation of the bearing, each single-row roller portion retainer C ₁ is not the generation of inconvenience to generate noise and rattle.

Further, the single-row roller cage C ₁ is provided with a plurality of column portions 43 in the circumferential direction between the opposed portions of the central annular body 41 and the outer annular body 42, and the spherical rollers 31 are accommodated between the adjacent column portions 43. Since the pocket rows provided with the pockets 44 are single-row cages, the double-row spherical rollers 31 do not need to be brought into contact with the opposite end faces, and the central annular body 41 can be thickened to increase the strength. it can.

  On the other hand, since the outer annular body 42 is guided by the inner ring, the inner diameter of the outer annular body 42 can be made small and high in strength with a diameter substantially equal to the minimum outer diameter of the inner ring 21.

Thus, it is possible to have a strength in the center-side annular body 41 and an outer annular body 42, to be excellent in low durability damaging the retainer C ₁ for single-row roller portion having high strength Thus, it is possible to obtain a self-aligning roller bearing capable of receiving a very large rotational load and vibration shock load.

Furthermore, single-row roller portion retainer C _1, since the pocket column is cage single row, pockets column compared to the cage retainer double row, machining is easy, reduce the cost be able to.

Here, single row roller portion retainer C ₁ may be of brass, may be of iron. When the single-row roller portion for the retainer C ₁ and made of brass, can be more easily processed in the cage, it is possible to further reduce costs, to suppress wear and galling by the self-lubricating Can do.

On the other hand, the retainer C ₁ for single-row roller portion When iron, it is possible to obtain a high strength cage. When the iron single row roller cage C ₁ is subjected to surface hardening treatment such as soft nitriding, shot blasting, diamond-like carbon (DLC) coating, hard chrome plating, etc., the strength of the cage C ₁ is increased. Can be increased.

Further, mention may be made of the iron cage C ₁ for single-row roller portion when subjected to a lubricity treatment such as phosphate treatment or silver plating treatment, the effects of wear and galling of suppression.

  In FIG. 2, the retaining protrusion 47 is provided at the center in the length direction of the pillar portion 43, but as shown in FIG. 4, a plurality of retaining protrusions are provided on the side surface facing the pocket 44 of the pillar portion 43. When 47 is provided at intervals in the length direction of the column portion 43, the spherical roller 31 has a wide portion in the circumferential width of the column portion 43 in which the width dimension gradually decreases from both end portions toward the center portion in the length direction. Since it can be set as a stopper, the effect of preventing damage to the column portion 43 can be obtained, and the movement of the spherical roller 31 can be effectively suppressed.

  In FIG. 5, the column part 43 is provided with a plurality of bent parts 49 that bend to the outer diameter side of the cage. By forming the bent portion 49, the strength of the column portion 43 can be increased, and a cage having excellent durability can be obtained.

  In FIG. 6, the inner periphery of the column portion 43 is formed by a plurality of inclined surfaces 50 having different inclination angles, a plurality of bent portions 51 are provided at intersections of the inclined surfaces 50, and the outer periphery of the column portion 43 is convex. A spherical surface 52 is formed.

As described above, to form a spherical surface 52 of the convex on the outer periphery of the pillar portion 43, can be thickened column portion 43, it is possible to obtain a cage C ₁ having excellent strength strong durability.

11 outer ring 12 spherical raceway 21 inner race 22 spherical raceway 31 spherical roller C ₀ cage C ₁ single row roller cage 41 center side annular body 42 outer annular body 43 pillar portion 44 pocket 47 retaining projection 48 oil groove 49 bent portion 52 spherical surface

Claims (8)

An outer ring having a spherical raceway on the inner periphery and having an oil supply hole penetrating in the radial direction, an inner ring having a double-row spherical raceway on the outer periphery and no flanges, a double-row spherical raceway of the inner ring, and the outer ring In a self-aligning roller bearing comprising a double row spherical roller incorporated between the spherical raceways and a cage for holding the double row spherical roller,
The cage includes two single-row roller cages that hold spherical rollers for each row, and each of the two single-row roller cages has a central annular body guided by an outer ring, and an inner ring Formed by an outer annular body guided by the outer annular body and a plurality of column parts provided between the opposing parts of the outer annular body and the central annular body and spaced apart by spherical rollers in the circumferential direction. A cage-shaped pocket in which a roller accommodating pocket is formed between the pillars, and the two single-row roller cages are assembled in such a manner that the central annular members are opposed to each other, and the central annular members are in contact with each other. A self-aligning roller bearing characterized in that an oil groove penetrating in the radial direction of the cage is provided on a surface that relatively rotates, and the oil groove can communicate with an oil supply hole of the outer ring .   A plurality of retaining protrusions that prevent the spherical rollers accommodated in the pockets from falling off outward in the radial direction of the cage are spaced apart in the length direction of the pillars on the side facing the pockets of the pillars. The self-aligning roller bearing according to claim 1 provided.   The self-aligning roller bearing according to claim 1 or 2, wherein the column portion has a plurality of bent portions that are bent toward the outer diameter side of the cage.   3. The self-aligning roller bearing according to claim 1, wherein the column portion has a plurality of bent portions bent on the outer diameter side of the cage on the inner periphery, and a spherical surface is provided on the outer periphery.   The self-aligning roller bearing according to any one of claims 1 to 4, wherein the single-row roller cage is made of brass.   The self-aligning roller bearing according to any one of claims 1 to 4, wherein the single row roller cage is made of iron.   The self-aligning roller bearing according to claim 6, wherein the single row roller cage is subjected to surface hardening treatment.   The self-aligning roller bearing according to claim 6, wherein the single row roller cage is lubricated.

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