JP6613602B2 - Tapered roller bearings - Google Patents

Description

  The present invention relates to a tapered roller bearing.

  Generally, a cage made of resin or metal is known as a cage used for a tapered roller bearing (see, for example, Patent Document 1). A roller guide system is widely used for this type of cage.

JP 2006-250184 A

However, since the roller guide type bearing has a high degree of freedom of movement of the roller, the radial runout width of the bearing becomes large and vibration resistance and impact resistance are likely to be lowered. For this reason, when a roller guide type bearing is applied to a railway vehicle, construction machine, or the like with intense vibration, the cage may be cracked, cracked, worn, or the like depending on the use conditions. In addition, the pocket of the cage that comes into contact with the tapered roller is not easy to manufacture because of its complicated shape, and manufacturing costs such as management costs and measurement costs in the manufacturing process increase.
For the above reasons, the roller guide type cage is required to have particularly high vibration resistance and impact resistance, and the pillar part of the cage that defines the pocket and the annular part at both ends of the pillar part have a larger cross section. Dimensions are needed. As a result, the size and number of rollers that can be incorporated are limited, and it is difficult to increase the dynamic load rating and static load rating of the bearing. Moreover, there exists a possibility that lubricity may fall because a cross-sectional dimension becomes large.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a tapered roller bearing that can be easily manufactured, has improved vibration resistance and impact resistance, and can improve lubricity.

The present invention has the following configuration.
(1) An outer ring having a conical outer ring raceway surface, a conical inner ring raceway surface, a small collar portion formed on one side in the axial direction of the inner ring raceway surface, and formed on the other side in the axial direction An inner ring having a large collar, a plurality of tapered rollers that are arranged to roll between the outer ring raceway surface and the inner ring raceway surface, and a cage that holds the tapered rollers in the circumferential direction at predetermined intervals. An inner ring guide type tapered roller bearing comprising:
The small ring portion of the inner ring has a cage guide surface on one axial side of the outer diameter surface thereof,
The cage is arranged in a plurality in the circumferential direction, a small-diameter side annular part on one axial end side, a large-diameter side annular part on the other axial end side, and the small-diameter side annular part and the large-diameter side A column part connecting the annular part along the axial center of the tapered roller,
The small-diameter-side annular portion is a circumferential direction in which the guided portion and the column portion are arranged so that the entire surface faces the cage guide surface provided in the small collar portion of the inner ring through a radial gap. An opening communicating in the axial direction at least at a part of the position,
The radial gap between the cage guide surface and the guided surface is 0.300 to 1.200 mm,
The small collar portion of the inner ring has a small collar outer diameter surface that is larger in diameter than the cage guide surface, on the other side in the axial direction than the cage guide surface of the outer diameter surface,
A tapered roller bearing, wherein the cage is manufactured by pressing a metal material.
( 2 ) The opening includes a through hole penetrating in the axial direction of the cage, and the through holes are arranged at equal intervals along a circumferential direction of the cage ( The tapered roller bearing according to 1) .
( 3 ) The opening includes a groove formed by notching an inner peripheral edge of the small-diameter side annular portion toward a radially outer side, and the groove is one along the circumferential direction of the cage. The tapered roller bearing as set forth in (1) , wherein the tapered roller bearings are arranged at equal intervals at positions corresponding to the column portions arranged in a table or a plurality of columns.

  According to the present invention, a tapered roller bearing can be easily manufactured, vibration resistance and impact resistance can be improved, and lubricity can be improved.

It is a figure for demonstrating embodiment of this invention, and is a partial cross section figure of a tapered roller bearing. FIG. 2 is a partially enlarged perspective view of the cage shown in FIG. 1. It is a partial side view of the tapered roller bearing seen from the V1 direction of FIG. It is a partial cross section figure of the tapered roller bearing of the 2nd example of composition. It is a partial side view of the tapered roller bearing seen from the V2 direction of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
<First configuration example>
FIG. 1 is a view for explaining an embodiment of the present invention and is a partial sectional view of a tapered roller bearing. The tapered roller bearing 100 can be suitably used for applications that support the rotation shafts of various industrial equipment such as railway vehicles, automobiles, construction machines, and steel rolling mills in addition to general mechanical structure bearings. .

  The tapered roller bearing 100 having this configuration includes an outer ring 11, an inner ring 13, a tapered roller 15, and a cage 17.

  The outer ring 11 has a conical outer ring raceway surface 21 on the inner peripheral surface. The inner ring 13 has a conical inner ring raceway surface 23 on the outer peripheral surface. A small flange portion 25 is formed on one side in the axial direction of the inner ring raceway surface 23 of the inner ring 13, and a large flange portion 27 is formed on the other side in the axial direction.

  The outer diameter surface of the small flange portion 25 is processed into a cage guide surface 41 and a small flange outer diameter surface 43 in order from the end surface 29 on one axial side of the inner ring 13. The cage guide surface 41 is a cylindrical surface having a uniform diameter, and the small outer diameter surface 43 is formed with a protruding portion that protrudes radially outward in a part thereof, and the tapered roller 15 is positioned in the axial direction. To do. The diameter Da of the gavel outer diameter surface 43 is slightly larger than the diameter Db of the cage guide surface 41.

  A plurality of the tapered rollers 15 are disposed between the outer ring raceway surface 21 and the inner ring raceway surface 23 so as to be freely rollable in a state where a plurality of the tapered rollers 15 are held by the cage 17.

  The cage 17 includes a small-diameter side annular portion 31 on one axial end side, a large-diameter side annular portion 33 on the other axial end side, and a small-diameter side annular portion 31 and a large-diameter side annular portion 33 that are tapered rollers. And a column portion 35 connected along 15 axial centers. A plurality of the column portions 35 are arranged in the circumferential direction. That is, the cage 17 is a cage-shaped cage that increases in diameter from one end side in the axial direction toward the other end side.

  FIG. 2 shows a partially enlarged perspective view of the cage 17. In the cage 17, a pocket 37 is defined by the small-diameter side annular portion 31, the large-diameter side annular portion 33, and the pillar portions 35 and 35. The tapered roller 15 is held in the pocket 37. In the cage 17, the tapered rollers 15 are rotatably held in pockets 37 formed at predetermined intervals in the circumferential direction.

  Further, the small collar portion 25 and the large collar portion 27 of the inner ring 13 shown in FIG. 1 are in sliding contact with the small diameter side end surface 45 (tail surface) and the large diameter side end surface 47 (head surface) of the tapered roller 15, respectively. The roller 15 is positioned in the axial direction.

  On the outer peripheral surface of the inner ring 13, concave inner ring escape grooves 49, 49 are formed in the pair of corners connecting the small collar part 25 and the large collar part 27 and the inner ring raceway surface 23, respectively, along the circumferential direction. .

  As shown in FIG. 2, the small-diameter side annular portion 31 of the cage 17 has a guided surface 51 at the tip on one end side in the axial direction. The guided surface 51 faces the cage guide surface 41 formed on the small collar portion 25 of the inner ring 13 with a predetermined guide gap t (see FIG. 1), and guides the cage 17 to the inner ring. Become.

  A guide gap t, which is a radial gap between the cage guide surface 41 and the guided surface 51, is set as shown in Table 1 according to the guide diameter (inner diameter Dr of the cage 17).

  The small diameter side annular portion 31 is provided with a through hole 53 as an opening at a circumferential position where the column portion 35 of the cage 17 is disposed. The through hole 53 is a hole that penetrates the small-diameter side annular portion 31 in the axial direction.

FIG. 3 is a partial side view of the tapered roller bearing 100 as viewed from the direction V1 in FIG. The plurality of through holes 53 are arranged at equal intervals along the circumferential direction of the cage 17 for each central angle θ ₁ . Each through-hole 53 is formed along the axial direction of the cage 17 on a surface (a surface indicated by a two-dot chain line in the drawing) including the longitudinal axis of the column portion 35 of the cage 17 and the cage central axis. FIG. 1 is a cross-sectional view taken along line AA in FIG.

  The through-hole 53 serves as an oil passage that communicates between the bearing inner space and the bearing exterior, and fulfills the function of supplying or discharging the lubricating oil to the bearing inner space.

  The cage 17 is a metal press-molded product produced by pressing a metal material such as a steel plate into a cage shape. The through-hole 53 may be subjected to a punching process during press molding, or may be drilled with a drill or the like after press molding.

  According to the tapered roller bearing 100 having the above-described configuration, the column portion of the cage 17 is not a complicated column surface as in the conventional roller guide type cage, and the pocket 37 has a simple shape. Therefore, the cage 17 can be easily manufactured, and complicated processing is not required at the time of press molding.

  Further, when the bearing for setting the tapered roller 15 together with the cage 17 to the inner ring raceway surface 23 is assembled, the columnar portion 35 of the cage 17 is elastically deformed so that the tapered roller 15 is a convex portion of the small flange outer diameter surface 43. And is fitted into the inner ring raceway surface 23. The assembly of the bearings can be done simply by lightly caulking from this state. Further, it is not necessary to adjust the caulking according to the size of the bearing.

  And the tapered roller bearing 100 of this structure is an inner ring | wheel guide system, and the movement amount of the radial direction of the holder | retainer 17 is settled in the range of said narrow guide clearance t. Therefore, the vibration resistance and impact resistance of the bearing are improved, and the tapered roller bearing 100 of the present configuration can be applied to a railway vehicle or construction machine having a strong vibration without any trouble.

  Furthermore, by providing the through holes 53 evenly in the circumferential direction in the small-diameter-side annular portion 31 of the cage 17, the cage guide surface 41 formed in the small flange portion 25 of the inner ring 13 and the covered portion of the cage 17. Necessary and sufficient amount of lubricating oil is supplied between the guide surface 51 and the small-diameter side end surface 45 (tail surface) and the rolling surface of the tapered roller 15, so that the oil film is more reliably formed. Thereby, lubricity can be maintained satisfactorily and an increase in bearing temperature accompanying rotation can be suppressed.

<Second configuration example>
Next, a second configuration example of the tapered roller bearing will be described. In the following description, the same members as those described above are denoted by the same reference numerals, and the description thereof is simplified or omitted.

  FIG. 4 is a partial cross-sectional view of the tapered roller bearing of the second configuration example. The tapered roller bearing 200 of this configuration is the same as the tapered roller bearing 100 except that the opening of the cage 18 is different from the cage 17 described above.

  In the cage 18 of this configuration, a guided surface 51 is formed at the tip of one end side in the axial direction of the small diameter side annular portion 31. As described above, the guided surface 51 faces the cage guide surface 41 formed in the small collar portion 25 of the inner ring 13 with a predetermined guide gap t, and guides the cage 18 to the inner ring. The guide gap t is set as shown in Table 1 above.

  The small-diameter-side annular portion 31 is cut as an opening in which the inner peripheral edge of the small-diameter-side annular portion 31 is cut out radially outward at a circumferential position where the column portion 35 of the cage 18 is disposed. A groove 55 is provided. The cut groove 55 is a groove that penetrates the small-diameter side annular portion 31 in the axial direction.

FIG. 5 is a partial side view of the tapered roller bearing 200 viewed from the direction V2 in FIG. The kerfs 55 are evenly arranged for each central angle θ ₂ along the circumferential direction of the cage 17. Each kerf 55 is formed along the axial direction of the cage 18 on a plane (a plane indicated by a two-dot chain line in the drawing) including the longitudinal axis of the column portion 35 of the cage 18 and the cage central axis. 4 is a cross-sectional view taken along the line BB in FIG.

  The kerf 55 serves as an oil passage that communicates between the bearing inner space and the outside of the bearing, and has a function of supplying or discharging lubricating oil to the bearing inner space.

  According to the tapered roller bearing 200 configured as described above, the same operational effects as those of the tapered roller bearing 100 described above can be obtained. Further, by using a configuration in which the cut groove 55 is provided instead of the through hole 53, the processing of the opening can be further simplified. That is, the kerf 55 can be formed not only by cutting but also by bending a sheet metal or the like, which facilitates processing. In addition, since the kerf 55 is arranged to face the cage guide surface 41 and the guided surface 51 more, the amount of lubricating oil supplied to each guide surface increases, and better lubricity can be obtained.

  As described above, the present invention is not limited to the above-described embodiments, and those skilled in the art can make changes and applications based on combinations of the configurations of the embodiments, descriptions in the specification, and well-known techniques. This is also the scope of the present invention, and is included in the scope for which protection is sought.

For example, the center angles θ ₁ and θ ₂ for determining the arrangement interval between the through hole 53 and the cut groove 55 are not limited to the illustrated example, and the through hole 53 and the cut groove 55 are arranged at the circumferential position of the column portion 35. If so, it can be set to an arbitrary angle. Further, if the through hole 53 and the cut groove 55 are formed in the cage together, the supply of the lubricating oil becomes smoother.
Furthermore, the cages 17 and 18 are not limited to metal press-molded products, and may be formed by casting or cutting, or may be resin-integrated molded products.

DESCRIPTION OF SYMBOLS 11 Outer ring 13 Inner ring 15 Tapered roller 17 Cage 21 Outer ring raceway surface 23 Inner ring raceway surface 25 Small collar part 27 Large collar part 31 Small diameter side annular part 33 Large diameter side annular part 35 Column part 37 Pocket 41 Cage guide surface 43 Gauge outer diameter surface 45 Small diameter side end surface 49 Inner ring relief groove 51 Guided surface (guide surface)
53 Through hole (opening)
55 Cut groove (opening)
100 Tapered roller bearing t Guide clearance

Claims (3)

An outer ring having a conical outer ring raceway surface, a conical inner ring raceway surface, a small collar portion formed on one side in the axial direction of the inner ring raceway surface, and a large collar portion formed on the other side in the axial direction An inner ring, a plurality of tapered rollers that are rotatably arranged between the outer ring raceway surface and the inner ring raceway surface, and a cage that holds the tapered rollers at predetermined intervals in the circumferential direction. An inner ring guide type tapered roller bearing,
The small ring portion of the inner ring has a cage guide surface on one axial side of the outer diameter surface thereof,
The cage is arranged in a plurality in the circumferential direction, a small-diameter side annular part on one axial end side, a large-diameter side annular part on the other axial end side, and the small-diameter side annular part and the large-diameter side A column part connecting the annular part along the axial center of the tapered roller,
The small-diameter-side annular portion is a circumferential direction in which the guided portion and the column portion are arranged so that the entire surface faces the cage guide surface provided in the small collar portion of the inner ring via a radial clearance. An opening communicating in the axial direction at least at a part of the position,
The radial gap between the cage guide surface and the guided surface is 0.300 to 1.200 mm,
The small collar portion of the inner ring has a small collar outer diameter surface that is larger in diameter than the cage guide surface, on the other side in the axial direction than the cage guide surface of the outer diameter surface,
A tapered roller bearing, wherein the cage is manufactured by pressing a metal material. The opening portion includes a through hole penetrating in the axial direction of the retainer, the through holes are to claim 1, characterized in that are arranged at equal intervals along the circumferential direction of the retainer The tapered roller bearing described. The opening includes a groove formed by notching an inner peripheral edge of the small-diameter-side annular portion toward a radially outer side, and the groove is arranged one by one or plurally along the circumferential direction of the cage. 2. The tapered roller bearing according to claim 1 , wherein the tapered roller bearings are arranged at equal intervals at positions corresponding to the pillar portions arranged individually. 3.

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