KR101681272B1 - Cage, and tapered roller bearing having the same - Google Patents

Cage, and tapered roller bearing having the same Download PDF

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Publication number
KR101681272B1
KR101681272B1 KR1020150089611A KR20150089611A KR101681272B1 KR 101681272 B1 KR101681272 B1 KR 101681272B1 KR 1020150089611 A KR1020150089611 A KR 1020150089611A KR 20150089611 A KR20150089611 A KR 20150089611A KR 101681272 B1 KR101681272 B1 KR 101681272B1
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KR
South Korea
Prior art keywords
diameter portion
small diameter
partition wall
tapered roller
axial direction
Prior art date
Application number
KR1020150089611A
Other languages
Korean (ko)
Inventor
현준수
이운주
배송식
김규복
Original Assignee
주식회사 베어링아트
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Priority to KR1020150089611A priority Critical patent/KR101681272B1/en
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Publication of KR101681272B1 publication Critical patent/KR101681272B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/46—Cages for rollers or needles
    • F16C33/4617—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages
    • F16C33/4623—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages
    • F16C33/4635—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages made from plastic, e.g. injection moulded window cages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/36—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
    • F16C19/364—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/46—Cages for rollers or needles
    • F16C33/467—Details of individual pockets, e.g. shape or roller retaining means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C43/00—Assembling bearings
    • F16C43/04—Assembling rolling-contact bearings
    • F16C43/06—Placing rolling bodies in cages or bearings
    • F16C43/08—Placing rolling bodies in cages or bearings by deforming the cages or the races
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0467—Elements of gearings to be lubricated, cooled or heated
    • F16H57/0469—Bearings or seals
    • F16H57/0471—Bearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/54—Systems consisting of a plurality of bearings with rolling friction
    • F16C19/546—Systems with spaced apart rolling bearings including at least one angular contact bearing
    • F16C19/547—Systems with spaced apart rolling bearings including at least one angular contact bearing with two angular contact rolling bearings
    • F16C19/548—Systems with spaced apart rolling bearings including at least one angular contact bearing with two angular contact rolling bearings in O-arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/54—Systems consisting of a plurality of bearings with rolling friction
    • F16C19/56—Systems consisting of a plurality of bearings with rolling friction in which the rolling bodies of one bearing differ in diameter from those of another
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2361/00—Apparatus or articles in engineering in general
    • F16C2361/61—Toothed gear systems, e.g. support of pinion shafts

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

The present invention relates to a cage and a tapered roller bearing having the same. The cage comprises: an annular small diameter portion; an annular large diameter portion spaced apart from the small diameter portion by a predetermined interval in the axial direction and having a larger diameter than the small diameter portion; and partitions disposed at predetermined intervals in the circumferential direction to connect the small diameter portion and the large diameter portion and forming a tape roller pocket for receiving a tape roller with the small diameter portion and the large diameter portion. The small diameter portion has a buffer hole formed in the longitudinal direction of the partition to guide lubricating oil. Therefore, the cage of the present invention can improve assembly efficiency, reduce scratches on the roller, and improve the supply of the lubricating oil by forming the buffer hole in the small diameter portion of the cage.

Description

[0001] CAGE, AND TAPER ROLLER BEARING WITH THE SAME [0002] CAGE, AND TAPERED ROLLER BEARING HAVING THE SAME [0003]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cage, and a tapered roller bearing having the cage, and more particularly, to a cage having improved assemblability by forming a buffer hole and a tapered roller bearing having the same.

In general, a bearing is a mechanical element mounted between a rotating element and a non-rotating element to facilitate rotation of the rotating element while supporting the axis of the rotating element.

These bearings are divided into sliding bearings and rolling bearings depending on the state of contact with the shaft, and can be classified into a radial bearing and a thrust bearing according to the direction in which the load is applied.

The rolling bearing is capable of supporting a rotating shaft by a rolling body such as a ball or a roller. Rolling bearings having such a structure are advantageous in that the frictional resistance is smaller than that of a sliding bearing that directly contacts a part of the shaft. As a result, rolling bearings are currently used in various forms such as ball bearings, tapered roller bearings, and needle bearings depending on the shape of rolling elements.

The tapered roller bearing has a generally tapered cylindrical shape and is used for the purpose of simultaneously supporting the loads in the rotational axis direction and the radial direction. For example, a shaft of a power transmission device such as an axle in a vehicle may be supported, or an automatic transmission may be used.

The tapered roller bearing includes an inner ring, an outer ring spaced apart from the inner ring by a predetermined distance, a tapered roller interposed between the inner ring and the outer ring, and a cage for receiving the rolling member.

The cage has an annular body and a plurality of tapered roller pockets along the circumference of the body, and the tapered roller is received through the tapered roller pocket.

Meanwhile, the inner ring is assembled while being press-fitted at the other side of the tapered roller bearing. At this time, the inner ring fixes and supports the cage with the tapered rolling element interposed therebetween. In this process, scratches such as scratches may be generated on the surface of the tapered rolling element due to contact between the inner ring and the surface during assembly. The life of the tapered roller bearing is lowered due to the above phenomenon.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a cage which is improved in its assemblability and scratch resistance on a roller surface by forming a buffer hole in a small diameter portion of a cage, and a tapered roller bearing having the cage. It is for that purpose.

According to an aspect of the present invention, there is provided a cage comprising an annular small-diameter portion, an annular large-diameter portion having a larger diameter than the small-diameter portion and spaced apart from the small- And a plurality of partition walls spaced circumferentially to connect the small diameter portion and the large diameter portion, the small diameter portion and the large diameter portion receiving the tapered roller together; Wherein at least one or more buffer holes are formed on one surface of the small diameter portion so as to guide lubricating oil, wherein the at least one buffer hole includes at least one of the small diameter portion and the small diameter portion corresponding to at least a part of the plurality of partition walls, Wherein the small diameter portion has a thickness in the axial direction and the buffer hole has at least a through hole extending axially from one surface of the small diameter portion to a part of the partition wall, And a stepped portion having a shape radially inwardly sloped to guide the lubricating oil to the tapered roller at a portion adjacent to the small diameter portion is formed on the radially outer side surface of the partition wall. A small diameter portion disposed at a predetermined distance in the axial direction from the small diameter portion, The large diameter of the ring-shaped with a larger diameter than the portion; And a plurality of partition walls spaced circumferentially to connect the small diameter portion and the large diameter portion and accommodating the tapered roller together with the small diameter portion and the large diameter portion. In addition, at least one buffer hole may be formed on one surface of the small diameter portion so as to guide lubricating oil.

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The buffer hole may have a depth set in the axial direction, and the predetermined depth may be 1/5 or more and 1/3 or less of the axial length of the partition wall.

The buffer hole may have a width set in a radial direction, and the predetermined width may be 1/5 or more and 1/3 or less of a radial thickness of the partition wall.

The barrier rib may be formed with a buffer surface opposed to the buffer hole in the axial direction, and the buffer surface may be formed as a curved surface.

A lubricant oil retaining groove is formed in the radially inner side surface of the partition wall so as to retain the lubricant in the longitudinal direction thereof and a first stepped surface and a second stepped surface are formed on the radially outer side surface of the partition wall to form the stepped portion, Wherein the stepped surface extends so as to have an inclination from a radially outer side to a radially inner side of the partition wall from the small-diameter portion side toward the large-diameter portion side, and the second stepped surface extends from the large- Wherein the first stepped surface and the second stepped surface form a lubricating oil guide groove for supplying the lubricating oil introduced in the axial direction to the tapered roller, The predetermined depth of the hole is set so as to pass through the partition wall in the axial direction from one surface of the small diameter portion and extend to the upper end of the first step surface To be formed can be characterized.

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The tapered roller bearing according to an embodiment of the present invention includes an inner ring, an outer ring spaced apart from the inner ring by a predetermined distance and corresponding to the inner ring, at least one tapered roller interposed between the inner ring and the outer ring, Wherein the cage includes a small diameter portion formed in a circular ring shape, a large diameter portion disposed axially spaced apart from the small diameter portion and having a diameter larger than that of the small diameter portion; A plurality of partition walls spaced apart in the circumferential direction and axially connecting the small diameter portion and the large diameter portion; Wherein at least one or more buffer holes are formed on one surface of the small diameter portion so as to guide lubricating oil, wherein the at least one buffer hole includes at least one of the small diameter portion and the small diameter portion, Wherein the radially outer portion of the partition wall is formed with a stepped portion having a radially inwardly sloped portion to guide the lubricating oil to the tapered roller at a portion adjacent to the small diameter portion, .

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The small diameter portion has a thickness in the axial direction, and the buffer hole is formed to penetrate at least a part of the partition wall in the axial direction from one surface of the small diameter portion.

A first stepped surface and a second stepped surface are formed on the radially outer side surface of the partition wall so as to form the stepped portion, and the first stepped surface is formed so as to be radially inward from the radial outside of the partition wall toward the large- And the second stepped surface extends so as to have an inclination toward a radially outward side toward the large-diameter portion side at a portion apart from the first stepped surface toward the large-diameter portion side, and the first stepped surface and the second step And the lubricating oil guide groove for supplying the lubricating oil flowing in the axial direction to the tapered roller is formed on the other surface of the partition wall, wherein the buffer hole has a depth set in the axial direction, / 5 or more and 1/3 or less, and the predetermined depth of the buffer hole is the depth of the partition wall in the axial direction from one surface of the small- And extends to an upper end of the first stepped surface.

The buffer hole may have a width set in a radial direction, and the predetermined width may be 1/5 or more and 1/3 or less of a radial thickness of the partition wall.

The barrier rib may be formed with a buffer surface opposed to the buffer hole in the axial direction, and the buffer surface may be formed as a curved surface.

The cage may be formed of a plastic material by a die process.

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And the partition wall is provided with a lubricant oil retaining groove for retaining the lubricant in the longitudinal direction thereof.

The cage may be applied to an axle or an automatic transmission provided in a vehicle.

As described above, according to the embodiment of the present invention, by forming the buffer hole in the small-diameter portion of the cage, it is possible to suppress occurrence of scratches on the surface of the tapered roller when the inner ring is press-fitted into the assembly of the cage and the roller. Further, when the inner ring is assembled to the assembly of the cage and the roller, the buffer hole is more easily assembled due to the minute deformation of the buffer hole. Further, since the path of lubricating oil is secured by the buffer hole, an appropriate amount of lubricating oil can be smoothly supplied to the tapered roller. Therefore, it is possible to provide an environment in which the taper roller can operate more effectively.

1 is a sectional view of a vehicle axle to which a cage according to an embodiment of the present invention is applied.
2 is a sectional view of an automatic transmission for a vehicle to which a cage according to an embodiment of the present invention is applied.
3 is a perspective view of a cage in accordance with an embodiment of the present invention.
4 is an enlarged perspective view of a portion A in Fig.
5 is a schematic view showing that the inner ring is press-fitted into the cage according to the embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

For convenience of explanation, the left side of the drawing in the axial direction is referred to as' one side ',' one end ',' one end 'and the like name, and the right side of the drawing in the axial direction is referred to as' other side, End " and similar names.

The parts denoted by the same reference numerals throughout the specification mean the same or similar components.

1 is a sectional view of a vehicle axle to which a cage according to an embodiment of the present invention is applied.

The tapered roller bearing shown in Fig. 1 exemplifies the case where the tapered roller bearing is applied to a vehicle axle, and the technical idea of the present invention is not limited to the axle of the vehicle exemplified in this specification, but is applicable to various fields.

1, an axle 1 of a vehicle according to an embodiment of the present invention includes an axle housing 3, a pinion shaft 9 provided so as to rotate with a step at an inner side of the axle housing 3, And a pinion gear 41 that is rotated to receive the rotational force from the pinion shaft 9 and rotate together.

An axle ring gear 51 is disposed at the other end of the pinion gear 41. The axle ring gear 51 may be driven to engage with the pinion gear 41 as the pinion gear 41 rotates.

A gear housing 60 is provided on the other side of the axle ring gear 51. A differential gear 63 and an output gear 61 are disposed inside the gear housing 60. The driving force of the axle ring gear 51 is transmitted to the differential gear 63 and the driven gear 61). The gear housing 60 is coupled to the axle shaft 70 by the differential gear 63 and the driven gear 61 and the axle shaft 70 is driven to drive at least other gears do.

Meanwhile, according to the embodiment of the present invention, at least one tapered roller bearing 10 may be provided between the pinion shaft 9 and the axle housing 3. The tapered roller bearing 10 is adapted to support the pinion shaft 9 inside the axle housing 3.

As shown in FIG. 1, the axle 1 may be provided with a first tapered roller bearing 11 and a second tapered roller bearing 21. The second tapered roller bearing 21 is disposed on the other side of the first tapered roller bearing 11 and may be larger than the first tapered roller bearing 11.

The first tapered roller bearing 11 includes a first inner ring 13, a first outer ring 15, and a first tapered roller 17. The first inner ring 13 is press-fitted into the pinion shaft 9 and rotates together. The first outer ring 15 is spaced apart from the first inner ring 13 by a predetermined distance and encloses the first inner ring 13. The first taper roller (17) is interposed between the first inner ring (13) and the first outer ring (15).

The second tapered roller bearing 21 may have the same configuration as the first tapered roller bearing 11 described above. That is, the second tapered roller bearing 21 includes a second inner ring 23 which is press-fitted into the pinion shaft 9 and rotates together, and a second outer ring 23 spaced from the second inner ring 23 by a predetermined distance in the radial direction 25), and a second tapered roller (27) interposed between the second inner ring (23) and the second outer ring (25).

By varying the sizes of the first taper roller bearing 11 and the second taper roller bearing 21, it is possible to effectively reduce the vibration generated in the pinion shaft 9. [ In particular, the vibration generated in the pinion shaft 9 can be more effectively reduced by disposing the second tapered roller bearing 21 having a large diameter in the vicinity of the pinion gear 41 to which a high load can be applied.

Furthermore, the axle 1 may further include a third tapered roller bearing 111 and a fourth tapered roller bearing 121 to support the gear housing 60. The third and fourth tapered roller bearings 111 and 121 have a configuration similar to that of the first and second tapered roller bearings 11 and 21.

2 is a sectional view of an automatic transmission for a vehicle to which a cage according to an embodiment of the present invention is applied. The vehicle transmission shown in Fig. 2 is one example, and the technical idea of the present invention is not limited to the automatic transmission of the vehicle exemplified in this specification, but is applicable to various transmissions.

The automatic transmission 2 for a vehicle according to the embodiment of the present invention includes a first shaft 2a receiving power from the engine 200 and a planetary gear set PG disposed on the first shaft 2a . A motor M and a generator G are disposed on both sides of the planetary gear set PG and the power output from the ring gear R of the planetary gear set PG is transmitted to the second shaft 4a and the third shaft 4a , 6a. Thereafter, the power is decelerated at the second and third axes 4a and 6a and finally transmitted to the wheel through the differential 8.

For example, the planetary carrier PC of the planetary gear set PG is connected to the first shaft 2a, the sun gear S is connected to the generator G, (M). The counter drive gear 16 of the second shaft 4a meshes with the counter driven gear 18 of the third shaft 6a and the final gear 20 of the third shaft 6a meshes with the counter gear (22). ≪ / RTI > Accordingly, the power transmitted to the first shaft 2a is transmitted to the second and third shafts 4a and 6a, and the power is finally transmitted through the differential shaft 8 to the axle 1).

The general functions and configurations of the vehicular automatic transmission 2 are obvious to those skilled in the art, and a detailed description thereof will be omitted below.

A fifth tapered roller bearing 210 and a sixth tapered roller bearing 310 may be used to support the first, second, and third axes 2a, 4a, 6a. The fifth and sixth tapered roller bearings 210 and 310 include third and fourth inner rings 213 and 313 that rotate together with the shaft and third and fourth inner rings 213 and 313 that are spaced apart from the third and fourth inner rings 213 and 313, Fourth tapered rollers 217 and 317 interposed between the outer rings 215 and 315 and the third and fourth inner rings 213 and 313 and the third outer rings 215 and 315, respectively. Furthermore, the automatic transmission 2 may further include a seventh tapered roller bearing 240 and an eighth tapered roller bearing 340. The seventh and eighth tapered roller bearings 240 and 340 have a configuration similar to the fifth and sixth tapered roller bearings 210 and 310 described above.

According to the embodiment of the present invention, the first, second, third and fourth tapered roller bearings 11, 21, 111 and 121 applied to the axle 1 and the first, 5, 6, 7, 8 tapered roller bearings 210, 310, 240, 340 further include a cage 40, respectively. The cage 40 is not limited to the position of each of the tapered roller bearings shown in Figs. 1 and 2, and is not limited to the position of the tapered roller bearing as well as the axle 1 or the automatic transmission 2 Configuration.

The cage 40 receives and rotatably supports the tapered rollers 17, 27, 217, and 317 and maintains a gap between the plurality of tapered rollers 17, 27, 217, and 317.

FIG. 3 is a perspective view of a cage according to an embodiment of the present invention, FIG. 4 is an enlarged perspective view of a portion A of FIG. 3, and FIG. 5 is a schematic view illustrating press fitting of an inner ring into a cage according to an embodiment of the present invention.

The cage 40 will be described in more detail below with reference to Figures 3-5. The first, second, and third inner rings 13, 23, 213, and 313, the first and second tapered roller bearings 11, The first and second tapered rollers 17, 27, 217 and 317 are respectively connected to the inner ring 13, the outer ring 15, and the second and third outer rings 15, 25, 215 and 315 ' , And 'taper roller 17', respectively.

3 to 4, the cage 40 includes a small-diameter portion 42 formed in a circular ring shape, and a small-diameter portion 42 spaced from the small-diameter portion 42 in the axial direction, A large diameter portion 44 having a relatively large diameter and a plurality of partition walls 46 axially connecting the small diameter portion 42 and the large diameter portion 44 and arranged at a predetermined interval in the circumferential direction do. In addition, a tapered roller pocket 50 is formed in the circumferential direction between the adjacent plurality of partition walls 46.

The cage 40 can be molded by injection molding with a simple metal mold using a plastic material. Therefore, the caulking process required in the process of manufacturing a conventional steel retainer can be omitted, and productivity and mass productivity can be improved.

The partition wall 46 is formed in a generally rectangular block shape and includes an outer side surface located radially outwardly and an inner surface positioned radially inwardly.

The tapered roller 17 should have a proper level of lubricant for smooth lubrication. 3, a step 47 is formed at a portion of the outer surface of the partition wall 46 adjacent to the small diameter portion 42 in a radially inwardly oblique direction. As shown in FIG. 3, . The stepped portion 47 serves to prevent the lubricant from being excessively introduced into the tapered roller 17 in the axial direction.

For example, the lubricating oil between each of the tapered roller bearings 10 shown in FIG. 1 may be excessively introduced between the outer ring 15 and the tapered roller 17 on the small diameter portion 42 , And the step portion (47) is formed in the small diameter portion (42), so that the moving path of the lubricating oil flowing in the axial direction can be changed in the radial direction. The radially shifted lubricating oil remains between the first tapered roller bearing 11 and the second tapered roller bearing 21 as the cage 40 rotates in the circumferential direction. Therefore, the cage 40 prevents excessive lubricating oil from entering the first and second tapered rollers 17 and 27, and the first and second tapered rollers 17 and 27 can hold an appropriate level of lubricant .

Likewise, the lubricant retained in the space between the third tapered roller bearings 210 shown in Fig. 3 can also be appropriately supplied to the third taper roller 217 by the cage 40. [
The detailed shape of the stepped portion 47 will be described in more detail with reference to FIGS. 3 and 4. FIG. As described above, the stepped portion 47 is formed in a shape that is scraped radially inwardly at a portion adjacent to the small diameter portion 42, and the first stepped surface 110a and the first stepped surface 110a, which are close to the small diameter portion 42, And a second stepped surface 110b formed farther from the small diameter portion.
The first stepped surface 110a is formed to extend axially upward from the small diameter portion 42 by a predetermined length L (see Fig. 4) so as to be inclined radially inward from the small diameter portion 42 to the large diameter portion 44 And the second stepped surface 110b is formed to have a slope radially outward from the radially innermost portion of the first stepped surface 110a toward the large diameter portion 44. [
Accordingly, the first stepped surface 110a and the second stepped surface 110b form the lubricating oil guide groove 110. The lubricating oil guide groove 110 has the first stepped surface 110a and the second stepped surface 110b, 110b in the radial direction. In addition, a flat surface may be formed between the axial direction of the first step face 110a and the second step face 110b having the maximum depth.
As described above, the lubricating oil guide groove 110 functions to block the lubricating oil flowing in the axial direction excessively while retaining a part of the lubricating oil inside thereof. The lubricant guide groove 110 is disposed between the pair of tapered rollers 17 provided in the tapered roller pocket 50 so that the lubricant held by the tapered roller 17 in the circumferential direction It provides a stable supply. Therefore, the taper roller 17 can always be supplied with the lubricating oil at an appropriate level.

In addition, a lubricating oil retaining groove 49 may be formed in the radially inner side surface of the partition 46 in a radially outwardly widened shape. The lubricant oil retaining groove 49 extends in the longitudinal direction of the partition wall 46, and its cross section can be formed in various shapes. The lubricating oil accommodated in the lubricating oil retaining groove 49 may be supplied to the tapered roller 17 as the cage 40 rotates in the circumferential direction to improve the lubricating performance thereof.

3 to 4, a buffer hole 100 is formed at a portion where the partition wall 46 and the small diameter portion 42 meet. The buffer hole 100 may be formed in a shape having a predetermined width D and opened in the longitudinal direction of the partition wall 46.

Therefore, when the cage 40 rotates, an appropriate amount of lubricating oil is supplied to the taper roller 17 by the buffer hole 100. Further, when an excessive amount of lubricating oil is supplied to the tapered roller 17, the lubricating oil is guided through the buffer hole 100 to the small diameter portion 42 side. Therefore, the taper roller 17 can always be supplied with an appropriate amount of lubricating oil.

5, the inner ring 13 is assembled while applying a certain force (indicated by an arrow) in the axial direction inside the radius of the cage 40. As shown in FIG. At this time, the taper roller 17 received in the cage 40 and the inner ring 13 come into contact with each other, and scratches such as scratches may be generated. As described above, when the material of the cage 40 is made of plastic and a plurality of buffer holes 100 are formed in the small-diameter portion 42, when the inner ring 13 is assembled, 42 are slightly deformed radially outward. Even if the inner ring 13 is assembled to the cage 40, occurrence of scratches on the surface of the taper roller 17 can be suppressed. Accordingly, the durability and the function of the taper roller 17 are improved, and fuel efficiency of the vehicle is eventually improved.

The buffer hole 100 is formed so as to be surrounded by the first wall surface 100a, the second wall surface 100b, and the buffer surface 100c. The first wall face 100a and the second wall face 100b are spaced apart by a predetermined width D and extend from the one end of the cage 40 by a depth F set to the other side in the axial direction.

The set width D may be greater than 1/5 of the radial thickness of the partition 46 and less than 1/3. When the set width D is equal to or less than 1/5 of the thickness of the partition wall 46, an appropriate amount of lubricating oil can not be introduced. Also, when the set width D is 1/3 or more of the thickness of the partition wall 46, an excessive amount of lubricant is supplied. Therefore, in order to supply an appropriate amount of lubricating oil, the set width D is preferably 1/5 to 1/3 of the thickness of the partition 46.

The set depth F is preferably 1/5 to 1/3 of the axial length of the partition wall 46. If the set depth F is smaller than 1/5 of the axial length of the partition wall 46, the lubricating oil is hardly guided to the tapered roller 17. Further, even if the inner ring 13 is assembled to the cage 40, the cage 40 is not sufficiently deformed so that scratches do not occur on the surface of the tapered roller 17. Further, when the set depth F exceeds 1/3 of the axial length of the partition 46, an excessive amount of lubricating oil may be introduced into the tapered roller 17. Therefore, in order to improve the assemblability of the cage 40 and the inner ring 13 while the proper amount of lubricating oil is supplied to the tapered roller 17, the set depth F is set in the axial direction of the partition wall 46 1/5 to 1/3 of the length is appropriate.
According to the embodiment of the present invention, the predetermined depth (F) of the upper cushioning hole (100) should be set at least larger than the axial depth (S) of the small diameter portion (42). 4, the predetermined depth F may correspond to 1/4 of the axial length of the partition wall 46, and more specifically, Can extend from the lower axial end of the neck portion 42 to the upper axial end of the first step face 110a. As described above, the lubricant oil guide groove 110 has the maximum depth at the axial upper end of the first step face 110a, and supplies lubricant to the tapered roller 17 arranged in the circumferential direction Structure. Therefore, when the cushioning bushing 100 extends axially to the maximum depth of the lubricating oil guide groove 110, lubricating oil guided axially through the bushing hole 100 is introduced into the lubricating oil guide groove 110 The lubricating oil retained by the lubricating oil guide groove 110 is smoothly supplied to the tapered roller 17 through the cushioning hole 100 when the lubricating oil is supplied to the tapered roller 17 in an excessive amount, And goes out of the bearing. Therefore, an appropriate amount of lubricant can always be supplied to the tapered roller 17.

On the other hand, the buffering surface 100c has a rounded shape. That is, the buffer hole 100 may be formed in a U shape together with the first wall surface 100a, the second wall surface 100b, and the buffer surface 100c. By forming the damping surface 100c in a round shape, it is possible to prevent the lubricating oil introduced into the buffer hole 100 from being excessively supplied or being supplied to a specific portion of the tapered roller 17 in a small amount. In addition, when the inner ring 13 is assembled to the cage 40, damage can be prevented from occurring even if deformation occurs in the buffer surface 100c and its adjacent portion.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

Claims (20)

An annular small neck;
An annular large diameter portion spaced apart from the small diameter portion by a predetermined distance in the axial direction and having a larger diameter than the small diameter portion; And
A plurality of partition walls spaced apart in a circumferential direction so as to connect the small diameter portion and the large diameter portion and accommodating the tapered roller together with the small diameter portion and the large diameter portion;
≪ / RTI >
And at least one buffer hole is formed on one surface of the small diameter portion so as to guide lubricating oil,
Wherein the at least one buffer hole extends in a longitudinal direction of the partition wall at a portion where the small diameter portion and the partition wall are connected to each other corresponding to at least a part of the plurality of partition walls,
Wherein the small diameter portion has a thickness in the axial direction and the buffer hole is formed to penetrate at least a portion of the partition wall in the axial direction from one surface of the small diameter portion,
Wherein a radially outer side surface of the partition wall is formed with a stepped portion having a shape radially inwardly slid so as to guide lubricating oil to the tapered roller at a portion adjacent to the small diameter portion.
delete delete delete The method according to claim 1,
The buffer hole has a depth set in the axial direction,
Wherein the predetermined depth is 1/5 to 1/3 of the axial length of the partition wall.
6. The method of claim 5,
The buffer hole has a width set in the radial direction,
Wherein the predetermined width is 1/5 to 1/3 of the radial thickness of the partition wall.
The method according to claim 6,
Wherein the partition wall has a buffer surface facing the buffer hole in the axial direction, and the buffer surface is formed as a curved surface.
delete 6. The method of claim 5,
A lubricant oil retaining groove is formed in the radially inner side surface of the partition wall so as to retain the lubricant in the longitudinal direction thereof,
A first stepped surface and a second stepped surface are formed on the radially outer surface of the partition wall to form the stepped portion,
The first stepped surface extends so as to have an inclination from the outside of the radius of the partition wall to the inside of the radius gradually from the small diameter portion side to the large diameter portion side and the second stepped surface is located at a portion apart from the first stepped surface toward the large- And extends so as to be inclined radially outwardly toward the large-diameter portion side,
Wherein the first stepped surface and the second stepped surface form a lubricating oil guide groove for supplying lubricating oil introduced in the axial direction to the tapered roller,
Wherein the predetermined depth of the buffer hole extends from the one surface of the small diameter portion to the upper end of the first stepped surface through the partition wall in the axial direction.
Inner ring;
An outer ring spaced apart from the inner ring by a predetermined distance and corresponding to the inner ring;
At least one tapered roller interposed between the inner ring and the outer ring;
A cage for receiving and rotatably supporting the taper roller;
, ≪ / RTI &
The cage
A small-diameter portion formed in a circular ring shape;
A large diameter portion disposed axially away from the small diameter portion and having a diameter larger than that of the small diameter portion; And
A plurality of partition walls spaced in the circumferential direction and axially connecting the small diameter portion and the large diameter portion;
/ RTI >
And at least one buffer hole is formed on one surface of the small diameter portion so as to guide lubricating oil,
Wherein the at least one buffer hole extends in a longitudinal direction of the partition wall at a portion where the small diameter portion and the partition wall are connected to each other corresponding to at least a part of the plurality of partition walls,
Wherein the small diameter portion has a thickness in the axial direction and the buffer hole is formed to penetrate at least a portion of the partition wall in the axial direction from one surface of the small diameter portion,
Wherein a radially outer surface of the partition wall is formed with a stepped portion having a radially inwardly sloped portion for guiding lubricant to the tapered roller at a portion adjacent to the small diameter portion.
delete delete delete 11. The method of claim 10,
A first stepped surface and a second stepped surface are formed on the radially outer surface of the partition wall to form the stepped portion,
The first stepped surface extends so as to have an inclination from the outside of the radius of the partition wall to the inside of the radius gradually from the small diameter portion side to the large diameter portion side and the second stepped surface is located at a portion apart from the first stepped surface toward the large- And extends so as to be inclined radially outwardly toward the large-diameter portion side,
Wherein the first stepped surface and the second stepped surface form a lubricating oil guide groove for appropriately supplying lubricating oil introduced in the axial direction to the tapered roller,
The buffer hole has a depth set in the axial direction,
Wherein the predetermined depth is 1/5 to 1/3 of the axial length of the partition wall,
Wherein the predetermined depth of the buffer hole extends from the one surface of the small diameter portion to the upper end of the first step surface through the partition wall in the axial direction.
15. The method of claim 14,
The buffer hole has a width set in the radial direction,
Wherein the predetermined width is 1/5 to 1/3 of the radial thickness of the partition wall.
16. The method of claim 15,
Wherein the buffer wall is formed with a buffer surface opposed to the buffer hole in the axial direction, and the buffer surface is formed as a curved surface.
17. The method of claim 16,
Wherein the cage is formed of a plastic material by a die process.
delete 18. The method of claim 17,
Wherein the partition wall is provided with a lubricant oil retaining groove for retaining the lubricant in the longitudinal direction thereof.
11. The method of claim 10,
Wherein the cage is applied to an axle or an automatic transmission provided in a vehicle.
KR1020150089611A 2015-06-24 2015-06-24 Cage, and tapered roller bearing having the same KR101681272B1 (en)

Priority Applications (1)

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KR1020150089611A KR101681272B1 (en) 2015-06-24 2015-06-24 Cage, and tapered roller bearing having the same

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Application Number Priority Date Filing Date Title
KR1020150089611A KR101681272B1 (en) 2015-06-24 2015-06-24 Cage, and tapered roller bearing having the same

Publications (1)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006029522A (en) * 2004-07-20 2006-02-02 Ntn Corp Tapered roller bearing
JP2010151211A (en) * 2008-12-25 2010-07-08 Nakanishi Metal Works Co Ltd Retainer for conical roller bearing, conical roller bearing and method of assembling the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006029522A (en) * 2004-07-20 2006-02-02 Ntn Corp Tapered roller bearing
JP2010151211A (en) * 2008-12-25 2010-07-08 Nakanishi Metal Works Co Ltd Retainer for conical roller bearing, conical roller bearing and method of assembling the same

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