JP5304519B2 - Tapered roller bearing outer ring and tapered roller bearing - Google Patents

Description

  The present invention relates to an outer ring of a tapered roller bearing and a tapered roller bearing.

  Conventionally, as a tapered roller bearing, there is one described in Japanese Patent Application Laid-Open No. 11-48805 (Patent Document 1). This tapered roller bearing supports the pinion shaft of the differential gear device rotatably with respect to the housing of the differential device.

  The tapered roller bearing includes an outer ring, an inner ring, and a plurality of tapered rollers. The outer circumferential surface of the outer ring is fitted and fixed to the inner circumferential surface of the housing, while the inner circumferential surface of the inner ring is fitted and fixed to the outer circumferential surface of the pinion shaft. The plurality of tapered rollers are spaced apart from each other in the circumferential direction while being held by a cage between the conical raceway surface of the outer ring and the conical raceway surface of the inner ring. The outer ring of the tapered roller bearing is solid.

  However, since the conventional tapered roller bearing has a solid outer ring, it cannot be reduced in weight, and when used in a vehicle, there is a problem that the operating cost increases and the material cost increases.

  Further, since the outer ring of the tapered roller bearing is solid, there is a problem that the amount of turning is large, the turning time is long, and the manufacturing cost is high.

Japanese Patent Laid-Open No. 11-48805 (FIG. 1)

  Accordingly, an object of the present invention is to provide an outer ring and a tapered roller bearing of a tapered roller bearing that can achieve weight reduction and reduce operating cost, material cost, and manufacturing cost.

In order to solve the above problems, the outer ring of the tapered roller bearing of the present invention is:
It consists of an integral metal plate,
The metal plate is
A conical cylinder portion having a conical track surface on the inner periphery;
A radially extending portion extending in a substantially radial direction of the conical tube portion from an end portion on the small diameter side of the conical tube portion;
One end is connected to the radially outer end of the radially extending portion, and a cylindrical portion extending substantially in the axial direction of the conical tubular portion;
A central backup portion that extends from the other end of the cylindrical portion to the axial central portion of the outer peripheral surface of the conical cylindrical portion, and backs up the central portion;
The large diameter of the conical cylinder portion is bent from the large-diameter end to the radially outward side, and the outer diameter of the radially outer end surface is substantially the same as the outer diameter of the outer peripheral surface of the cylindrical portion. And a radial-side bent portion.

  The integrated metal plate includes, for example, a metal flat plate, a seamless cylindrical metal plate, and a cylindrical metal plate with a seam such as an electric sewing tube. included. The integrated metal plate includes a curved metal plate material such as a tile-like metal plate.

  Moreover, the said center part shows parts other than the both ends of the axial direction of a conical cylinder part. In addition, it is preferable that the part of the conical cylinder part backed up by the central backup part is in the vicinity of the approximate center in the axial direction of the conical cylinder part from the viewpoint of preventing the conical raceway surface from being bent, based on vision.

  According to the present invention, since the outer ring is made of an integrated metal plate that is much lighter than the metal lump, the mass is significantly smaller than that of a conventional solid outer ring. Therefore, when the outer ring of the present invention is used in a vehicle, the operating cost is lower and the material cost is lower than that of a solid outer ring. According to the present invention, since the outer ring is made of an integral metal plate, turning or the like is unnecessary or the amount of turning can be reduced, and the manufacturing cost is reduced.

  In addition, according to the present invention, since it is made of an integral metal plate and functions as an outer ring in one piece, unlike the case where the outer ring is formed of a plurality of parts, there is no need to adjust each part at all and it is easy. And can be handled easily.

  In addition, according to the present invention, the conical orbital surface has a conical cylindrical portion continuously present in the axial direction, and the conical orbital surface continuously exists in the axial direction. The substantially entire area in the axial direction of the rolling surface of the tapered roller can be supported by the conical cylinder portion. Therefore, the tapered roller can roll stably and smoothly on the conical raceway surface.

  In addition, according to the present invention, since there is a radially extending portion that extends in the substantially radial direction of the conical cylinder portion from the end portion on the small diameter side of the conical cylinder portion, the radially extending portion is used as a housing or the like. The outer ring mounting member can be brought into contact with the axial end surface. Accordingly, since a drag force can be received from the axial end face, an axial load can be applied.

  Further, according to the present invention, the cylindrical portion is connected to the radially outer end portion of the radially extending portion and extends substantially in the axial direction of the conical cylindrical portion. It can be fixed by being fitted into the inner peripheral surface of the mounting member. Similarly, the outer diameter of the outer end surface of the cylindrical portion is substantially the same as the outer diameter of the outer peripheral surface of the cylindrical portion, with the outer diameter of the outer end surface of the cylindrical portion being bent outward from the larger diameter end of the conical cylinder portion. Therefore, the large-diameter side bent portion can be fitted and fixed to the inner peripheral surface of an outer ring mounting member such as a housing. Therefore, two locations that are spaced apart in the axial direction between the cylindrical portion and the large-diameter-side bent portion can be fixed to the inner peripheral surface of the outer ring mounting member, so that the outer ring can be stably and reliably fixed to the outer ring mounting member. Can be fixed to.

  Further, according to the present invention, since the central backup portion extends from the other end of the cylindrical portion to the axial central portion of the outer peripheral surface of the conical cylindrical portion and backs up the central portion, the central backup portion Deformation of the conical track surface of the conical cylinder portion can be prevented.

  Further, according to the present invention, the central backup portion can increase the radial strength of the outer ring, and the radial extension portion and the large-diameter side bent portion can also increase the radial rigidity. Therefore, the rigidity in the radial direction can be increased and the radial strength of the outer ring can be increased at the three locations where the central backup portion, the radially extending portion, and the large-diameter side bent portion are separated from each other in the axial direction. However, there will be no problem.

In one embodiment,
The central backup portion extends in a substantially normal direction of the conical track surface.

  Note that the abbreviations in the substantially normal direction are determined by human vision.

  According to the embodiment, since the central backup portion extends in the substantially normal direction of the conical track surface, the effect of preventing the deformation of the conical track surface can be enhanced.

In one embodiment,
The integral metal plate is press-molded.

  According to the embodiment, since the integral metal plate is press-molded, the manufacturing cost of the outer ring can be reduced and the mass productivity can be improved.

In one embodiment,
The large diameter side bent portion extends substantially parallel to the central backup portion.

  According to the embodiment, since the large-diameter side bent portion extends substantially parallel to the central backup portion, the radial strength can be further increased.

In one embodiment,
A first through hole penetrating the radially extending portion;
A second through hole penetrating the central backup portion;
A third through hole penetrating the large-diameter side bent portion.

  According to the above embodiment, since each of the radially extending portion, the central backup portion, and the large-diameter side bent portion has the through hole, fluid (lubricating oil, cleaning liquid, coolant, etc.) is supplied to the conical cylinder. It is possible to flow from one side in the axial direction to the other side while contacting the portion, the radially extending portion, the central backup portion, and the large-diameter side bent portion. Accordingly, it is possible to efficiently cool the outer ring, in particular, the conical cylinder portion that generates heat due to the friction of the conical raceway surface.

In one embodiment,
The first through hole, the second through hole, and the third through hole are not on the same straight line.

  In the above embodiment, since the first through hole, the second through hole, and the third through hole are not collinear, the flow of fluid that passes through these through holes becomes a turbulent flow. . Therefore, the contact of the fluid with the larger surface portion of the outer ring can be realized, and the cooling effect of the outer ring, in particular, the conical cylinder portion is increased.

The tapered roller bearing of the present invention is
An outer ring of the present invention;
An inner race member having a conical raceway surface on the outer periphery;
It comprises a tapered roller disposed between the conical raceway surface of the outer ring and the conical raceway surface of the inner raceway member.

  According to the tapered roller bearing of the present invention, since the outer ring of the present invention is provided, the mass is remarkably reduced as compared with the conventional one. Accordingly, it is possible to reduce the weight, reduce the operating cost, reduce the material cost and the manufacturing cost.

  According to the outer ring of the tapered roller bearing of the present invention, the mass is remarkably reduced as compared with the conventional one.

  Further, according to the outer ring of the tapered roller bearing of the present invention, the radially extending portion can be brought into contact with the end surface in the axial direction of the outer ring mounting member such as the housing, and therefore, a drag can be received from the end surface. Thus, an axial load can be applied.

  Further, according to the outer ring of the tapered roller bearing of the present invention, the cylindrical portion can be fitted and fixed to the inner peripheral surface of the outer ring mounting member. Similarly, the large-diameter-side bent portion can be fitted and fixed to the inner peripheral surface of the outer ring mounting member. Accordingly, two locations of the cylindrical portion and the large-diameter side bent portion that are spaced apart in the axial direction can be fixed to the inner peripheral surface of the outer ring mounting member, so that the outer ring is stably and reliably fixed to the outer ring mounting member. can do.

  Moreover, according to the outer ring of the tapered roller bearing of the present invention, since the central backup portion is provided, deformation of the conical track surface of the conical cylinder portion can be prevented by the central backup portion.

  Further, according to the outer ring of the tapered roller bearing of the present invention, the radial rigidity is provided at three locations that are separated from each other in the axial direction by the central backup portion, the radially extending portion, and the large-diameter side bent portion. , And the strength of the outer ring in the radial direction is not problematic.

It is a schematic cross section of the axial direction which shows the tapered roller bearing of 1st Embodiment of this invention. It is a schematic cross section of the axial direction which shows the tapered roller bearing of the modification of 1st Embodiment. It is a schematic cross section of the axial direction which shows the tapered roller bearing of 2nd Embodiment of this invention.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view in the axial direction of a tapered roller bearing according to a first embodiment of the present invention.

  As shown in FIG. 1, this tapered roller bearing includes an inner ring 1, an outer ring 2, and a plurality of tapered rollers 3 as inner ring raceway members, and the inner ring 1 is externally fitted and fixed to the outer peripheral surface of a shaft member 5. Yes. The inner ring 1 has a conical raceway surface 21, a large collar part 22, and a small collar part 23. The large collar portion 22 is located on the large diameter side of the conical raceway surface 21, while the small collar portion 23 is located on the small diameter side of the conical raceway surface 21. The shaft member 5 has a step portion 26 that expands in the radial direction. An end surface 25 on the large diameter side of the conical raceway surface 21 of the inner ring 1 is in contact with the step portion 26.

  The outer ring 2 is formed by press-molding an integral sheet metal. Here, the material of the sheet metal includes bearing steel that can be plastically processed such as SUJ2, steel material that has been subjected to hardening treatment such as carbonitriding treatment on bearing steel that can be plastically processed, metal that can be plastically processed such as ordinary steel SPCC, carbon such as S55C, etc. Steel, chromium molybdenum steel such as SCM415, and materials such as N22CB and N35CB (Nisshin Steel Standard) in consideration of pressability.

  The outer ring 2 includes a conical cylinder portion 31, a radially extending portion 32, a cylindrical portion 33, a central backup portion 34, and a large-diameter side bent portion 35.

  The conical cylinder portion 31 has a conical track surface 38 on the inner periphery. The radially extending portion 32 extends from the end on the small diameter side of the conical cylinder portion 31 in the substantially radial direction of the conical cylinder portion 31. One end of the cylindrical portion 33 is connected to the radially outer end of the radially extending portion 32. The cylindrical portion 33 extends in a substantially axial direction of the conical cylindrical portion 31. The cylindrical portion 33 has a cylindrical outer peripheral surface 40.

  The central backup portion 34 extends from the other end of the cylindrical portion 33 to the vicinity of the axial center of the outer peripheral surface of the conical cylindrical portion 31 (this central vicinity is determined by human vision) It is in contact with a nearby outer peripheral surface. In this way, the central backup portion 34 backs up the outer peripheral surface near the center of the conical cylinder portion 31. The central backup portion 34 extends in a substantially normal direction of the conical raceway surface 38 of the outer ring 2 (the abbreviation here is determined by human vision) in the axial cross section. The central backup portion 34, the conical cylinder portion 31, the radially extending portion 32, and the cylindrical portion 33 define a sealed chamber 49.

  The large-diameter side bent portion 35 is connected to the large-diameter end of the conical cylinder portion 31. The large-diameter side bent portion 35 is bent radially outward from the large-diameter end of the conical cylinder portion 31 and extends substantially parallel to the central backup portion 34. A radially outer end face of the large-diameter side bent portion 35 is a cylindrical outer peripheral face 41. The outer diameter of the cylindrical outer peripheral surface 41 of the large-diameter side bent portion 35 is substantially the same as the outer diameter of the cylindrical outer peripheral surface 40 of the cylindrical portion 33.

  The outer ring 2 is fitted and fixed to the inner peripheral surface of the housing 9. Specifically, the cylindrical outer peripheral surface 40 of the cylindrical portion 33 and the cylindrical outer peripheral surface 41 of the large-diameter side bent portion 35 are fitted and fixed to the inner peripheral surface of the housing 9.

  An end face 46 opposite to the large-diameter side bent portion 35 in the axial direction of the radially extending portion 32 is in contact with a stepped portion 47 extending in the radial direction of the housing 9. The axially outer end surface 25 of the conical raceway surface 21 of the inner ring 1 is brought into contact with the step portion 26 of the shaft member 5, and the end surface 46 of the radially extending portion 32 is connected to the step portion 47 of the housing 9. Abut. In this way, the tapered roller bearing is sandwiched between the housing 9 and the shaft member 5 in the axial direction, and a preload in a predetermined axial direction is generated in the tapered roller bearing. Further, as shown in FIG. 1, the plurality of tapered rollers 3 are held by a cage 50 between the conical raceway surface 21 of the inner ring 1 and the conical raceway surface 38 of the conical cylinder portion 31 of the outer ring 2. In the state, they are arranged at intervals in the circumferential direction.

  The outer ring 2 is manufactured, for example, as follows.

  First, a through hole is formed in a metal flat plate by press punching. Next, the flat plate having the through hole is plastically deformed by pressing to form a conical cylinder portion. Subsequently, the small diameter side of the conical cylinder portion is plastically deformed by press working to form a radially extending portion. Subsequently, the outer side in the radial direction of the radially extending portion is plastically deformed by pressing to form a cylindrical portion extending in the axial direction. Subsequently, pressing is performed to plastically deform the side opposite to the radially extending portion side of the cylindrical portion, and from the side opposite to the radially extending portion side of the cylindrical portion, near the center in the axial direction of the conical cylinder portion Forming a central backup section extending to Subsequently, the large diameter side bent portion is formed by bending the large diameter side of the conical cylinder portion by pressing. Finally, the end surface in the radial direction of the large-diameter side bent portion is polished to form a cylindrical outer peripheral surface. In this way, an outer ring is formed. Depending on the metal material of the flat plate, it is preferable to perform a heat treatment such as carburizing, carbonitriding, sub-quenching, induction hardening, tempering, and a combination thereof, or a hardening treatment such as shot peening after the generation of the outer ring shape. .

  As another method, the outer ring 2 can be formed as follows.

  First, a through hole is formed in a metal disk-shaped flat plate by press punching to form a radially extending portion. Subsequently, the inner side in the radial direction of the radially extending portion is plastically deformed by pressing, and the inner diameter increases as the distance from the radially extending portion increases toward the radially inner side of the radially extending portion. A conical cylinder portion is formed in which becomes larger. Thereafter, the outer side in the radial direction of the radially extending portion is plastically deformed by pressing to form a cylindrical portion extending in the axial direction on the outer side in the radial direction of the radially extending portion. After that, pressing is performed to plastically deform the side opposite to the radially extending portion side of the cylindrical portion, and from the opposite side to the side opposite to the radially extending portion side of the cylindrical portion, the axis of the conical cylindrical portion is A central backup portion extending to near the center of the direction is formed. Subsequently, the large diameter side bent portion is formed by bending the large diameter side of the conical cylinder portion by pressing. Finally, the end surface in the radial direction of the large-diameter side bent portion is polished to form a cylindrical outer peripheral surface. In this way, an outer ring is formed.

  According to the outer ring 2 of the first embodiment, the outer ring 2 is made of an integrated metal plate that is much lighter than a lump of metal, so that the mass is remarkably smaller than that of a conventional solid outer ring. Specifically, the outer ring 2 of the first embodiment is about 40% (not limited to about 40%) of the outer ring of a conventional solid tapered roller bearing having a conical raceway surface substantially the same as the outer ring 2. Needless to say, there is only a small mass, and the mass is drastically reduced as compared with a conventional solid outer ring. Therefore, when the outer ring 2 of the first embodiment is used in a vehicle, the operating cost is lower and the material cost is lower than a conventional solid outer ring. Further, according to the outer ring 2 of the first embodiment, since the outer ring 2 is made of an integral metal plate, turning or the like is unnecessary or the amount of turning can be reduced, and the manufacturing cost is reduced.

  Also, according to the outer ring 2 of the first embodiment, since it is made of a single sheet metal and functions as an outer ring in one piece, the adjustment of each part is completely different from the case where the outer ring is formed of a plurality of parts. It is not necessary and can be easily assembled and handled easily.

  Further, according to the outer ring 2 of the first embodiment, the conical raceway surface 38 is the conical cylinder portion 31 that is continuously present in the axial direction, and the conical raceway surface 38 is in the axial direction. Since it exists continuously, the substantially whole area of the axial direction of the rolling surface of the tapered roller 3 can be supported by the conical cylinder part 31. Therefore, the tapered roller 3 can roll stably and smoothly on the conical raceway surface 38.

  Further, according to the outer ring 2 of the first embodiment, since there is a radially extending portion 32 extending from the end on the small diameter side of the conical cylinder portion 31 in the substantially radial direction of the conical cylinder portion 31, this diameter The direction extending portion 32 can be brought into contact with the axial step portion 47 of the housing 9. Therefore, since a drag force can be received from the step portion 47 of the housing 9, an axial load can be applied.

  Further, according to the outer ring 2 of the first embodiment, the cylindrical portion 33 is connected to the radially outer end portion of the radially extending portion 32 and extends in the substantially axial direction of the conical tubular portion 31. Therefore, the cylindrical portion 33 can be fitted and fixed to the inner peripheral surface of the housing 9. Similarly, the outer peripheral surface of the large-diameter side bent portion 35 that is bent and extended from the end portion on the large-diameter side of the conical cylinder portion 31 to the radially outer side is fitted into the inner peripheral surface of the housing 9. Can be fixed. Accordingly, the two portions of the cylindrical portion 33 and the large-diameter-side bent portion 35 that are spaced apart in the axial direction can be fixed to the inner peripheral surface of the housing 9, so that the outer ring 2 can be stably and reliably attached to the housing 9. Can be fixed.

  Further, according to the outer ring 2 of the first embodiment, the central backup portion 34 that extends from the other end of the cylindrical portion 33 to the vicinity of the axial center of the outer peripheral surface of the conical cylinder portion 31 and backs up the vicinity of the center. Therefore, the central backup portion 34 can prevent the conical track surface 38 of the conical cylinder portion 31 from being deformed.

  Further, according to the outer ring 2 of the first embodiment, the central backup portion 34 can increase the radial strength of the outer ring 2, and the radial extending portion 32 and the large-diameter side bent portion 35 can also be used. The radial rigidity can be increased. Therefore, the rigidity in the radial direction can be increased at the three locations where the central backup portion 34, the radially extending portion 32, and the large-diameter side bent portion 35 are spaced apart from each other in the axial direction. The strength in the radial direction is not problematic.

  Further, according to the outer ring 2 of the first embodiment, since the central backup portion 34 extends in the substantially normal direction of the conical raceway surface 38, the effect of preventing deformation of the conical raceway surface 38 is enhanced. Can do. More specifically, in the first embodiment, since the central backup portion 34 is in contact with the vicinity of the center of the conical cylinder portion 31 that is the load point, it is possible to efficiently prevent the conical track surface 38 from being bent. .

  Further, according to the outer ring 2 of the first embodiment, since the outer ring 2 is formed by press-molding an integral metal plate, the manufacturing cost can be reduced and the mass productivity can be improved.

  Further, according to the outer ring 2 of the first embodiment, since the large-diameter side bent portion 35 extends substantially parallel to the central backup portion 34, the radial strength can be further increased.

  Further, according to the tapered roller bearing of the first embodiment, the outer ring 2 is lighter than the conventional one, so that the mass of the tapered roller bearing is significantly smaller than the conventional one.

  In the outer ring 2 of the first embodiment, the outer ring 2 is formed by press-molding a metal integral plate. In the present invention, the outer ring is formed by rolling a metal integral plate. You may form using other plastic processing, such as a forging process.

  Further, in the outer ring 2 of the first embodiment, the outer ring 2 is formed from a flat metal plate. However, in the present invention, an outer ring may be formed by plastic deformation of a seamless cylindrical metal body. In addition, the outer ring may be formed by plastically deforming a cylindrical metal body having a seam such as an electric sewing tube.

  Further, in the outer ring 2 of the first embodiment, the central backup part 34 extends in the substantially normal direction of the conical raceway surface 38 of the outer ring 2, but in this invention, the central backup part is a cone of the outer ring. It does not have to extend in the normal direction of the raceway surface.

  In the outer ring 2 of the first embodiment, the large-diameter side bent portion 35 extends substantially parallel to the central backup portion. However, in the present invention, as shown in FIG. 2, that is, a schematic sectional view in the axial direction of the tapered roller bearing of the modified example of the first embodiment, the large-diameter side bent portion 135 of the outer ring 102 is connected to the central backup portion 134. It does not have to extend in parallel.

  In addition, it cannot be overemphasized that the use application of the tapered roller bearing of 1st Embodiment and its modification is not limited. Further, in the tapered roller bearing of the first embodiment and the modification thereof, the fluid outside the tapered roller bearing is in an environment where the fluid outside the tapered roller bearing (lubricating oil, cleaning liquid, etc.) can contact the tapered roller, Needless to say, it can be used in any case even in an environment where the tapered roller cannot be contacted.

  If a metal plate having a surface roughness of the surface roughness of the conical raceway surface is used as a raw material, when the outer ring is produced by pressing the metal plate, the product of the conical raceway surface of the outer ring as a product is used. It has been confirmed that orbital accuracy can be obtained. Therefore, it has been confirmed that polishing of the conical track surface is unnecessary. Therefore, in the outer ring of the present invention, the number of manufacturing steps can be significantly reduced.

  FIG. 3 is a schematic cross-sectional view in the axial direction showing the tapered roller bearing of the second embodiment of the present invention.

  The tapered roller bearing of the second embodiment is different from the tapered roller bearing of the first embodiment only in the structure of the outer ring 202. In the second embodiment, the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. In the second embodiment, descriptions of the operations and effects common to the first embodiment will be omitted, and only configurations, operations, and modifications different from those of the first embodiment will be described. .

  This tapered roller bearing is used in a vehicle pinion shaft support device that supports a vehicle pinion shaft such as a differential gear device, a transaxle device, or a transfer device. Specifically, the tapered roller bearing includes an inner ring 1 as an inner ring raceway member and an outer ring 202, and the inner ring 1 is externally fitted and fixed to a pinion shaft 205 of a vehicle pinion shaft support device. The outer ring 202 is fixed by being fitted into a housing 209 of the vehicle pinion shaft support device.

  The outer ring 202 includes a conical cylinder portion 231, a radially extending portion 232, a cylindrical portion 233, a central backup portion 234, and a large-diameter side bent portion 235.

  The outer ring 202 is compared with the outer ring 2 of the first embodiment in that the radially extending portion 232 has the first through hole 300 and the central backup portion 234 has the second through hole 301. The large-diameter side bent portion 235 is different in that it has a third through hole 302. Further, the outer ring 202 has a large-diameter-side bent portion 235 that extends in a substantially radial direction of the inner ring 1 instead of being parallel to the central backup portion 234 in comparison with the outer ring 2 of the first embodiment. Is different.

  As shown in FIG. 3, the first through hole 300 extends substantially in the axial direction, and the second through hole 301 extends substantially parallel to the conical track surface 238 of the conical cylinder portion 231. The third through hole 302 extends substantially in the axial direction.

  As shown in FIG. 3, the radially extending portion 232 is in contact with the step portion 247 of the housing 209. The housing 209 has a through hole 260 extending from the inner peripheral surface of the housing 209 to the stepped portion 247.

  In FIG. 3, an arrow a indicates the direction of the gear oil flow in the vehicle pinion shaft support device that passes through the through hole 260, and an arrow b indicates the direction of the gear oil flow that passes through the second through hole 301. c indicates the direction of the flow of gear oil passing through the third through hole 302.

  The central axis of the first through hole 300, the central axis of the second through hole 301, and the central axis of the third through hole 302 are not in the same line. Therefore, the three flow directions a, b, and c do not coincide with each other, and the gear oil does not smoothly flow from the radially extending portion 232 to the large-diameter side bent portion 235.

  Although not described in detail, this tapered roller bearing has an annular seal member 400 fixed to the housing 209 in the vicinity of the opening on the inlet side of the flow of gear oil between the inner ring 1 and the outer ring 202. Yes. The seal member 400 makes it difficult for gear oil to enter the tapered roller bearing.

  According to the tapered roller bearing of the second embodiment, each of the radially extending portion 232, the central backup portion 234, and the large-diameter side bent portion 235 has the through holes 300, 301, 302. Can be made to flow from one side in the axial direction to the other side while being in contact with the conical cylinder portion 231, the radially extending portion 232, the central backup portion 234, and the large-diameter side bent portion 235. Therefore, since the seal member 400 restricts the penetration of the gear oil between the outer ring 202 and the inner ring 1, the gear oil hardly flows between the outer ring 202 and the inner ring 1, and the outer ring 202, In particular, the conical cylinder portion 231 that generates heat due to the friction of the conical raceway surface 238 can be efficiently cooled. Therefore, the torque caused by the stirring resistance of the tapered roller 3 and the rolling viscous resistance of the tapered roller 3 due to the presence of gear oil can be reduced, and the fuel consumption of a vehicle or the like equipped with this tapered roller bearing can be reduced.

  Further, according to the tapered roller bearing of the second embodiment, the first through hole 300, the second through hole 301, and the third through hole 302 are not on the same straight line. , 302, 303, the flow of gear oil becomes turbulent. Therefore, the contact of the gear oil with the larger surface portion of the outer ring 202 can be realized, and the cooling effect of the outer ring 202, in particular, the conical cylinder portion 231 can be increased. Further, since the gear oil passes through the chamber 349 defined by the conical cylinder part 231, the radially extending part 232, the cylindrical part 233, and the central backup part 234, it is compared with a structure in which a through hole is provided in the outer ring. The surface area of the outer ring with which the gear oil comes into contact can be increased by a factor of 100. Therefore, the cooling effect can be greatly increased.

  In the second embodiment, the gear oil outside the tapered roller bearing can come into contact with the tapered roller 3, but in the present invention, the fluid outside the tapered roller bearing that can come into contact with the tapered roller is the gear oil. Not limited to this, other types of lubricating oil or cleaning liquid may be used. Moreover, in this invention, the fluid outside the tapered roller bearing which can contact a tapered roller does not need to exist. For example, a configuration in which a coolant such as cooling water passes through the first through hole, the second through hole, and the third through hole may be used.

  As a method for easily realizing a state in which the central axis of the first through hole, the central axis of the second through hole, and the central axis of the third through hole do not exist on the same straight line, for example, There is a method in which the direction of the central axis of one through hole is directed toward the conical cylinder portion. Thus, there is a method in which the fluid that has passed through the first through hole passes through the second through hole after colliding with the conical cylinder portion.

  As a method for easily realizing a state in which the central axis of the first through hole, the central axis of the second through hole, and the central axis of the third through hole do not exist on the same straight line, for example, the first The central axis of the through hole and the central axis of the second through hole are formed at different positions in the circumferential direction of the outer ring, and the central axis of the second through hole and the central axis of the third through hole are in the circumferential direction of the outer ring. There are methods of forming at different positions.

  In addition, the opening on the first through hole side of the second through hole does not overlap the first through hole extending the opening on the second through hole side of the first through hole along the central axis of the first through hole. The opening on the first through hole side of the through hole is formed so that the opening on the second through hole side of the first through hole does not overlap with the end that extends along the central axis of the second through hole, or the second The opening on the second through hole side of the third through hole does not overlap the tip of the third through hole that extends along the center axis of the second through hole. Preferably, the second through hole side opening is formed so that the second through hole side opening does not overlap with the end of the second through hole side extending along the central axis of the third through hole.

  Moreover, it is preferable to form the outer ring of the second embodiment by press molding because the first, second, and third through holes can be formed easily and inexpensively.

DESCRIPTION OF SYMBOLS 1 Inner ring 2,102,202 Outer ring 3 Tapered roller 21 Conical track surface of inner ring 31,231 Conical cylinder part 32,232 Radial extension part 33,233 Cylindrical part 34,134,234 Central backup part 35,135,235 Large Radial side bent portion 38,238 Conical raceway surface of outer ring 300 First through hole 301 Second through hole 302 Third through hole

Claims (7)

It consists of an integral metal plate,
The metal plate is
A conical cylinder portion having a conical track surface on the inner periphery;
A radially extending portion extending in a substantially radial direction of the conical tube portion from an end portion on the small diameter side of the conical tube portion;
One end is connected to the radially outer end of the radially extending portion, and a cylindrical portion extending substantially in the axial direction of the conical tubular portion;
A central backup portion that extends from the other end of the cylindrical portion to the axial central portion of the outer peripheral surface of the conical cylindrical portion, and backs up the central portion;
The large diameter of the conical cylinder portion is bent from the large-diameter end to the radially outward side, and the outer diameter of the radially outer end surface is substantially the same as the outer diameter of the outer peripheral surface of the cylindrical portion. An outer ring of a tapered roller bearing comprising a radial side bending portion. In the outer ring of the tapered roller bearing according to claim 1,
The outer ring of a tapered roller bearing, wherein the central backup portion extends in a substantially normal direction of the conical track surface. In the outer ring of the tapered roller bearing according to claim 1 or 2,
The outer ring of a tapered roller bearing, wherein the integral metal plate is press-molded. In the outer ring of the tapered roller bearing according to any one of claims 1 to 3,
The outer ring of a tapered roller bearing, wherein the large-diameter side bent portion extends substantially parallel to the central backup portion. In the outer ring of the tapered roller bearing according to any one of claims 1 to 4,
A first through hole penetrating the radially extending portion;
A second through hole penetrating the central backup portion;
An outer ring of a tapered roller bearing having a third through hole penetrating the large-diameter side bent portion. In the outer ring of the tapered roller bearing according to claim 5,
The outer ring of a tapered roller bearing, wherein the first through hole, the second through hole, and the third through hole are not collinear. The outer ring according to any one of claims 1 to 6,
An inner race member having a conical raceway surface on the outer periphery;
A tapered roller bearing comprising: a tapered roller disposed between the conical raceway surface of the outer ring and the conical raceway surface of the inner raceway member.

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