JP2017211020A - Roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller bearing capable of securing lubricity of a slide contact part over a long period.SOLUTION: A roller bearing includes an outer ring 2 having an outer ring raceway 20 on its inner peripheral surface, an inner ring 3 arranged inside the outer ring 2 and having an inner ring raceway 30 on its outer peripheral surface, and a plurality of rollers 4 arranged in a rollable manner between the outer ring raceway 20 and the inner ring raceway 30. The inner ring 3 has reservoir part 32 that is opened to at least one of shaft end sides and is a space expanding inside the inner ring 3, and a thin hole 33 communicating between the reservoir part 32 and the inner ring raceway 30. In the reservoir part 32, a lubricant-containing polymer 6 is stored.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a roller bearing.

  When a roller bearing is lubricated with a small amount of lubricant such as grease in order to reduce the torque, the seizure between the roller head which is a sliding contact portion and the inner ring flange surface becomes a problem. As a method for ensuring the lubricity of the sliding contact portion, for example, a plurality of oil holes that can store lubricating oil are equally distributed in the circumferential direction in the relief groove portion of the flange portion, so that the lubrication accumulated in the oil hole by its own weight There is a method of causing oil to flow out of an oil hole by centrifugal force, its own weight, or evaporation (Patent Document 1).

JP 2014-231898 A

  However, the roller bearing described in Patent Document 1 has a problem that the lubricant is exhausted quickly when grease is used as the lubricant because the volume of the inner ring oil hole in which the lubricant is accommodated is small. Also, once the roller bearings were assembled, the lubricant could not be supplied to the inner ring oil holes, and thus could not withstand long-term operation.

  Therefore, the present invention has been made paying attention to the above-described problem, and an object of the present invention is to provide a roller bearing capable of ensuring the lubricity of the sliding contact portion over a long period of time.

  According to one aspect of the present invention, an outer ring having an outer ring raceway on an inner peripheral surface, an inner ring disposed inside the outer ring and having an inner ring raceway on an outer peripheral surface, and between the outer ring raceway and the inner ring raceway, A plurality of rollers arranged to be freely rollable, and the inner ring is open to at least one shaft end side, and includes a reservoir portion that is a space extending inside the inner ring, the reservoir portion, and the inner ring raceway. There is provided a roller bearing having a communicating pore and in which the reservoir contains a lubricant-containing polymer.

In the roller bearing, the pores may extend from the inner ring raceway toward the inner periphery of the inner ring.
Furthermore, in the roller bearing, the inner ring may further include an annular sleeve that covers an opening of the pool portion on at least one shaft end side.

Further, in the roller bearing, the plurality of rollers have a truncated cone shape, and the pool portion is provided at least on the large-diameter flange portion side of the inner ring that contacts the large-diameter side end surface of the plurality of rollers. Also good.
Furthermore, in the roller bearing, the volume of the pool portion may be 15% or more and 20% or less of the bearing space volume of the roller bearing.

  According to one aspect of the present invention, a roller bearing capable of ensuring the lubricity of the sliding contact portion over a long period of time is provided.

It is a fragmentary sectional view showing a roller bearing concerning one embodiment of the present invention. It is a partial cutaway perspective view which shows a roller bearing. It is explanatory drawing which shows the space volume of a roller bearing. It is a front view which shows the inner ring | wheel of the state in which the sleeve is not mounted | worn. It is a front view which shows the inner ring | wheel with the state with which the sleeve was mounted | worn. It is the II sectional view taken on the line of FIG. It is a fragmentary sectional view showing a roller bearing in a modification. It is a partial cutting perspective view which shows the roller bearing (cylindrical roller bearing) in a modification. It is a partial cutting perspective view which shows the roller bearing (the self-aligning bearing which has a spherical roller) in a modification.

  In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the present invention. However, it will be apparent that one or more embodiments may be practiced without such specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing.

<Roller bearing>
First, with reference to FIGS. 1-6, the structure of the roller bearing 1 which concerns on one Embodiment of this invention is demonstrated. As shown in FIGS. 1 and 2, the roller bearing 1 according to the present embodiment is a tapered roller bearing having an outer ring 2, an inner ring 3, a plurality of rollers 4, and a cage 5. The roller bearing 1 is used for a gear box, a vehicle, a steel manufacturing facility, a paper manufacturing facility, a windmill, a water wheel, a machine tool, a construction machine, a mining machine, an agricultural machine, a roller support, and the like. Of these, gearboxes are used in transmissions and differential gears, vehicles are used in automobiles, railway vehicles, construction machinery, etc., and roller support is used for conveyance and rolling. It is used for the roller.

The outer ring 2 is a substantially ring-shaped bearing member, and has an outer ring raceway 20 on the inner peripheral surface.
The inner ring 3 is a substantially ring-shaped bearing member, and has an inner ring raceway 30 on the outer peripheral surface. The inner ring 3 is disposed inside the outer ring 2.
The plurality of rollers 4 have the same truncated cone shape, and are arranged between the outer ring raceway 20 and the inner ring raceway 30 so as to freely roll. The plurality of rollers 4 respectively have a large-diameter side end surface 40 that is a bottom surface having a large diameter and a small-diameter side end surface 41 that is a bottom surface having a small diameter on the shaft end side of each roller 4. In the example shown in FIGS. 1 to 6, the roller bearing 1 is provided with ten rollers 4.
The cage 5 is arranged between the outer ring 2 and the inner ring 3 and holds the plurality of rollers 4 at a predetermined interval in the outer circumferential direction of the inner ring 3.

The inner ring 3 includes a large-diameter flange 31a, a small-diameter flange 31b, a pool portion 32, a plurality of pores 33, a plurality of sleeve receivers 34, and a sleeve 35.
The large-diameter flange 31a and the small-diameter flange 31b are formed to protrude outward in the radial direction of the inner ring 3 on both axial sides of the outer peripheral surface of the inner ring 3 that is the both ends of the inner ring raceway 30. The large diameter flange portion 31 a contacts the large diameter side end face 40 of each roller 4 and positions each roller 4 in the axial direction of the inner ring 3. A pair of inner ring escape grooves 36a, which are grooves extending in the circumferential direction of the inner ring 3, are formed at the corners of the inner ring raceway 30 and the large diameter flange 31a and at the corners of the inner ring raceway 30 and the small diameter flange 31b. 36b is formed.

  The pool portion 32 is a space that opens on the shaft end side where the large-diameter flange portion of the inner ring 3 is provided and extends in an annular shape along the circumferential direction of the inner ring 3 inside the inner ring 3. The reservoir 32 preferably has a volume of 15% or more and 20% or less of the bearing space volume of the roller bearing 1. Here, the bearing space volume is a space obtained by removing the outer ring 2, the inner ring 3, the roller 4 and the cage 5 from the volume of the bearing outer shell size. For example, in FIG. 3, which is a partial cross-sectional view similar to FIG. 1, a region surrounded by a dotted line indicates a bearing outer shell of the roller bearing 1, and a shaded region indicates a bearing space volume. The lubricant-containing polymer 6 is accommodated in the pool portion 32.

  The lubricant-containing polymer 6 is obtained by plasticizing a raw material prepared by mixing a synthetic resin with a lubricant at a temperature equal to or higher than the melting point of the resin, and then cooling to form a solid. As the raw synthetic resin, a synthetic resin selected from the group of polyolefin resins having basically the same chemical structure such as polyethylene, polypropylene, polybutylene, polymethylpentene and the like can be used. As the raw material lubricant, any of paraffinic hydrocarbon oil such as poly α-olefin oil, naphthenic hydrocarbon oil, mineral oil, ether oil such as dialkyldiphenyl ether oil, ester oil such as phthalate ester, etc. Single or mixed oils can be used. The lubricant-containing polymer 6 may be a lubricant in which various additives such as an antioxidant, a rust inhibitor, an antiwear agent, a foam remover, and an extreme pressure agent are added in advance.

The composition ratio of the lubricant-containing polymer 6 is 10% by weight to 50% by weight of the polyolefin resin and 90% by weight to 50% by weight of the lubricant with respect to the total weight. When the polyolefin-based resin is less than 10% by weight, hardness / strength exceeding a certain level cannot be obtained, and it becomes difficult to maintain the initial shape when a load is applied. Further, when the polyolefin resin exceeds 50% by weight (that is, when the lubricant is less than 50% by weight), the supply of the lubricant is reduced and the life of the ball screw is shortened. This group of synthetic resins has the same basic structure but different average molecular weights, ranging from 700 to 5 × 10 ⁶ . And those classified into wax (e.g. polyethylene wax) an average molecular weight 700 to 1 × 10 ^4, and a relatively low molecular weight an average molecular weight ^{1 × 10 4 ~1 × 10 6} , the average molecular weight 1 × ¹⁰ 6 to 5 A super high molecular weight material of × 10 ⁶ is used alone or mixed as necessary. A combination of a relatively low molecular weight material and a lubricant provides a lubricant-containing polymer having a certain degree of mechanical strength, lubricant supply capability, and oil retention. If some of the relatively low molecular weight substances are replaced with those classified as waxes, the difference in molecular weight between those classified as waxes and lubricating oils is small, so the affinity with the lubricating oils increases. . As a result, the oil retaining property of the lubricant-containing polymer 6 is improved, and the lubricant can be supplied over a long period of time. However, on the other hand, the mechanical strength decreases. As the wax, in addition to a polyolefin resin such as polyethylene wax, any hydrocarbon-based resin having a melting point in the range of 100 ° C. to 130 ° C. or higher (for example, paraffin-based synthetic wax) can be used.

  The plurality of pores 33 are holes that connect the region where the inner ring escape groove 36 b of the inner ring raceway 30 b is formed and the pool portion 32, and linearly extend from the inner ring raceway 30 toward the inner periphery of the inner ring 3. . Further, the plurality of pores 33 are arranged at predetermined intervals in the circumferential direction of the inner ring 3. That is, the plurality of pores 33 are arranged radially about the axis of the inner ring 3 as viewed from the axial direction of the inner ring 3. In the example shown in FIGS. 1 to 6, the roller bearing 1 is provided with 14 fine holes 33.

As shown in FIGS. 4 and 6, the plurality of sleeve receivers 35 extend in the radial direction of the inner ring 3 to the opening of the pool portion 32 formed on the shaft end side of the inner ring 3, and the axis of the inner ring 3 is centered. Provided radially as the center. In FIG. 4, the plurality of sleeve receivers 35 are shaded portions, and 14 pieces are provided. The plurality of sleeve receivers 35 are provided so as to protrude in the axial direction of the inner ring 3 from the opening surface of the pool portion 32.
The sleeve 35 has an annular shape that covers the opening of the pool portion 32 when viewed from the axial direction of the inner ring 3, and the surface on the pool portion 32 side is uneven so that it can be fitted and removed with a plurality of sleeve receivers 35. Is formed.

<Modification>
Although the present invention has been described above with reference to specific embodiments, it is not intended that the present invention be limited by these descriptions. From the description of the invention, other embodiments of the invention will be apparent to persons skilled in the art, along with various variations of the disclosed embodiments. Therefore, it is to be understood that the claims encompass these modifications and embodiments that fall within the scope and spirit of the present invention.

  For example, in the above-described embodiment, the pool portion 32 and the plurality of pores 33 are provided on the large-diameter flange portion 31a side, but the present invention is not limited to such an example. For example, as shown in FIG. 7, the pool portions 32a and 32b and the plurality of pores 33a and 33b may be provided on both shaft end sides of the large-diameter flange portion 31a and the small-diameter flange portion 31b, respectively. In this case, the reservoir 32b and the plurality of pores 33b provided on the small diameter flange 31b side have the same configuration as the reservoir 32a and the plurality of pores 33a provided on the large diameter flange 31a described in the above embodiment. It becomes.

  Moreover, in the said embodiment, although it was set as the structure which uses the lubricant containing polymer 6, this invention is not limited to this example. When lubricating with a small amount of oil such as oil plating, as the lubricant-containing polymer 6, for example, a phenol resin or the like impregnated with oil may be added. Further, for example, a lubricant such as grease may be used instead of the lubricant-containing polymer 6.

  Further, in the above embodiment, the roller bearing 1 is a tapered roller bearing, but the present invention is not limited to this example. For example, the roller bearing 1 may be a cylindrical roller bearing in which the roller 4 is a cylindrical roller as shown in FIG. In this case, the pool portion 32, the pore 33, the sleeve receiver (not shown), and the sleeve 35 are provided on the side of the inner ring 3 where the flange portion 31c is provided in the same manner as in the above embodiment. Further, the pore 33 is formed so as to communicate the inner ring escape groove 36 c formed at the corner between the inner ring raceway 30 and the flange portion 31 c and the pool portion 32.

Furthermore, for example, the roller bearing 1 is a spherical roller having rollers 4a and 4b as shown in FIG. 9, and the rollers 4a and 4b are arranged in two rows in the axial direction of the inner ring 3 (where the rollers 4a are arranged). Self-aligning bearings arranged in two rows of 4b) may be used. In this case, the pool portions 32a and 32b, the pores 33a and 33b, the sleeve receiver (not shown), and the sleeves 35a and 35b are provided on both ends of the inner center of the inner ring 3, respectively. Further, the pores 33a and 33b are provided so that the ends thereof are opened on both end sides of the axial center of the inner ring raceway 30, respectively.
In addition, even when the roller bearing 1 as shown in FIG. 8 or FIG. 9 is a cylindrical roller bearing or a self-aligning bearing, it can be used for the same application as the roller bearing 1 according to the above embodiment.

Furthermore, in the said embodiment, although 14 pores 33 were provided, the present invention is not limited to such an example. A plurality of the pores 33 are preferably provided, and more preferably the number of the rollers 4 or more. When a plurality of pores 33 are provided, it is preferable that the plurality of pores 33 are arranged at equal intervals in the circumferential direction of the inner ring 3.
Furthermore, in the said embodiment, as shown in FIG. 3, although the pool part 32 was set as the structure opened in a substantially annular | circular shape at the axial end side, this invention is not limited to this example. As long as the lubricant-containing polymer 6 can be supplied from the outside, the shape of the opening of the reservoir 32 may be different from that of the above embodiment. In addition, although the pool portion 32 is a space that extends in an annular shape inside the inner ring 3, the present invention is not limited to such an example. For example, a space that is provided for each of the plurality of pores 33 and that extends inside the inner ring 3 may be used.

Furthermore, in the said embodiment, although it was set as the structure by which the sleeve 35 is provided in the roller bearing 1, this invention is not limited to this example. For example, the sleeve 35 is not provided if scattering of the lubricant contained in the lubricant-containing polymer 6 accommodated in the reservoir 32 does not matter according to the opening shape of the reservoir 32. It may be a configuration.
Furthermore, in the above-described embodiment, the pool portion 32 has a volume of 15% to 20% of the bearing space volume of the roller bearing 1, but the present invention is not limited to such an example. The pool portion 32 is appropriately set according to the required strength of the roller bearing 1 and the supply frequency of the lubricant.

  Furthermore, in the said embodiment, although the fine hole 33 extended linearly toward the inner periphery of the inner ring | wheel 3 from the inner ring | wheel track 30, this invention is not limited to this example. If the lubricant contained in the lubricant-containing polymer 6 can ooze out to the inner ring raceway 30 by centrifugal force generated by the rotation of the roller bearing 1, the pore 33 may have another shape, for example, a curved shape or an inner ring 3. The shape etc. which incline and extend with respect to the radial direction may be sufficient.

<Effect of embodiment>
(1) A roller bearing 1 according to one aspect of the present invention includes an outer ring 2 having an outer ring raceway 20 on an inner peripheral surface, an inner ring 3 disposed on the inner side of the outer ring 2 and having an inner ring raceway 30 on an outer peripheral surface, and an outer ring raceway. 20 and the inner ring raceway 30 are provided with a plurality of rollers 4 that are arranged so as to be freely rotatable, and the inner ring 3 is open to at least one shaft end side and is a reservoir portion that is a space extending inside the inner ring 3. 32 and a pore 33 communicating with the reservoir 32 and the inner ring raceway 30, and the lubricant-containing polymer 6 is accommodated in the reservoir 32.

According to the configuration of (1), the lubricant is supplied to the inner ring raceway 30 through the plurality of pores 33 by the centrifugal force generated by the rotation of the roller bearing 1 in a state where the reservoir portion 32 is filled with the lubricant-containing polymer 6. When the lubricant contained in the contained polymer 6 oozes out, the necessary lubricant is appropriately supplied. Thereby, lubricity can be ensured over a long period of time at contact portions such as between the inner ring 3 and 4, between the outer ring 2 and 4, and between the cage 5 and 4.
Further, in the roller bearing 1 according to the present embodiment, since the pool portion 32 is open to the shaft end side of the inner ring 3, a lubricant is supplied as necessary even after the roller bearing 1 is assembled. be able to. For this reason, the lubricity of a contact part is securable over a long period.

(2) In the configuration of (1) above, the pore 33 extends from the inner ring raceway 30 toward the inner circumference of the inner ring 3.
According to the configuration (2), the lubricant contained in the lubricant-containing polymer 6 is likely to ooze out to the inner ring raceway 30 through the plurality of pores 33 due to the centrifugal force generated by the rotation of the roller bearing 1.
(3) In the configuration of (1) or (2), the inner ring further includes an annular sleeve that covers the opening of the reservoir portion on at least one shaft end side.
According to the configuration of (3) above, the sleeve 35 that covers the opening of the reservoir portion 32 is provided, so that scattering of the lubricant during operation can be prevented.

(4) In the configuration of any one of (1) to (3), the plurality of rollers 4 have a truncated cone shape, and the pool portion 33 is an inner ring that contacts the large-diameter side end surface 40 of the plurality of rollers 4. 3 is provided at least on the large-diameter flange 31a side.
According to the configuration of the above (4), in the tapered roller bearing which is the roller bearing 1 having the roller 4 in the shape of the truncated cone, the contact portion of the inner ring raceway 30 on the large-diameter flange portion 31 side where the seizure easily occurs is provided. Lubricity can be ensured over a long period of time.
(5) In any one of the constitutions (1) to (4), the volume of the reservoir 32 is 15% or more and 20% or less of the bearing space volume of the roller bearing 1.
According to the above configuration, the lubricity of the contact portion can be ensured over a long period of time while ensuring the strength of the roller bearing 1.

DESCRIPTION OF SYMBOLS 1 Roller bearing 2 Outer ring 20 Outer ring raceway 3 Inner ring 30 Inner ring raceway 31a Large diameter collar part 31b Small diameter collar part 31c collar part 32, 32a, 32b Reservoir part 33, 33a, 33b Small hole 34 Sleeve receiving part 35 Sleeve 36a, 36b, 36c Inner ring relief groove 4 Roller 40 Large-diameter side end face 41 Small-diameter side end face 5 Cage 6 Lubricant-containing polymer

Claims (3)

An outer ring having an outer ring raceway on the inner peripheral surface;
An inner ring disposed inside the outer ring and having an inner ring raceway on an outer peripheral surface;
A plurality of rollers arranged in a freely rolling manner between the outer ring raceway and the inner ring raceway,
The inner ring has a reservoir part that is a space that opens to at least one shaft end side and extends inside the inner ring, and a pore that communicates the reservoir part with the inner ring raceway,
A roller bearing in which a lubricant-containing polymer is accommodated in the pool portion.   The roller bearing according to claim 1, wherein the pore extends from the inner ring raceway toward an inner periphery of the inner ring.   The roller bearing according to claim 1, wherein the inner ring further includes an annular sleeve that covers an opening of the pool portion on at least one shaft end side.

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