JP2017190821A - Tapered roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tapered roller bearing in which a lubrication oil holding member is mounted on an outer race without polishing a part of the outer race fitting with a lubrication oil holding member.SOLUTION: A tapered roller bearing 1 includes an outer race 10, an inner race 20, a plurality of tapered rollers 30, and a lubrication oil holding member 50. A cylindrical part 52 of the lubrication oil holding member 50 has, on an inner peripheral surface 64, a convex part 65 formed to protrude inward in a radial direction. A thin wall part 14 has, an outer peripheral surface 15, a concave part 16 formed to contain the convex part 65.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a tapered roller bearing, and more particularly to a tapered roller bearing that stores lubricating oil in a space in which the tapered roller rolls.

  The tapered roller bearing includes an outer ring, an inner ring, a plurality of tapered rollers, and a cage. The tapered roller is arranged so that the axis in the direction in which the tapered roller rolls is inclined with respect to the axis of the tapered roller bearing. The large diameter bottom surface (hereinafter also referred to as a large end surface) of the tapered roller is disposed radially outward of the bearing from the small diameter bottom surface (hereinafter also referred to as a small end surface).

  Tapered roller bearings are characterized by improving resistance to seizure between the large end surface of the tapered roller and the surface of the inner ring that contacts the large end surface of the tapered roller (hereinafter also referred to as the large collar surface), and the tapered roller. It is required to suppress wear on the pocket surface of the bearing cage. As such a tapered roller bearing, a tapered roller bearing in which a lubricating oil holding member is attached to an outer ring and the lubricating oil is stored in a space between the lubricating oil holding member and the outer ring is known (for example, Patent Document 1).

JP 2008-223891 A

  By the way, in the tapered roller bearing of Patent Document 1, a part of the outer ring is thinned to form a thin part, and a lubricating oil holding member is pressed into the outer periphery of the thin part, whereby the lubricating oil holding member is inserted into the outer ring. It is fixed. In this case, high accuracy is required for the outer diameter of the outer ring and the inner diameter of the lubricating oil retaining member. Therefore, it is necessary to perform polishing in addition to cutting on the portion of the outer ring where the lubricating oil holding member is press-fitted. This complicates the outer ring manufacturing process. In particular, since the lubricating oil retaining member is press-fitted into the thin part of the outer ring, the polishing work near the step between the thin part and the other part causes a decrease in the yield of the outer ring.

  In view of the above problems, an object of the present invention is to provide a tapered roller bearing capable of attaching a lubricating oil holding member to the outer ring without polishing a portion of the outer ring that fits with the lubricating oil holding member.

  The tapered roller bearing of the present invention that solves the above problems includes an outer ring having a first raceway surface on an inner peripheral surface, an inner ring having a second raceway surface on an outer peripheral surface and disposed coaxially with the outer ring. And a plurality of tapered rollers disposed in a space between the first raceway surface and the second raceway surface, and a lubricant holding member fixed integrally with the outer ring. The outer ring is formed with an annular thin portion at one end in the axial direction by an annular step surface provided on the outer peripheral surface, and the other end in the axial direction is fitted into the housing. The lubricating oil retaining member is formed in a cylindrical shape extending in the axial direction, and has a cylindrical portion disposed so that the end surface on the other side in the axial direction faces the step surface of the outer ring in the axial direction and covers the outer peripheral surface of the thin portion. And an annular portion formed in an annular shape extending in the radial direction and having an end portion on the radially outer side connected to an end portion on one axial side of the cylindrical portion. The cylindrical portion has a convex portion formed on the inner peripheral surface so as to protrude inward in the radial direction. The thin-walled portion has a concave portion formed on the outer peripheral surface so as to accommodate the convex portion and to restrict the movement of the lubricating oil retaining member in the axial direction.

  According to the present invention, it is possible to obtain a tapered roller bearing capable of attaching the lubricating oil holding member to the outer ring without polishing the portion of the outer ring that fits with the lubricating oil holding member.

FIG. 1 is a cross-sectional view showing the entire tapered roller bearing of the first embodiment. FIG. 2 is a cross-sectional view showing a part of the tapered roller bearing of the first embodiment. FIG. 3 is a cross-sectional view of the outer ring and the lubricant holding member according to the first embodiment. FIG. 4 is a cross-sectional view of an outer ring and a lubricant holding member according to Modification 1. FIG. 5 is a cross-sectional view of an outer ring and a lubricant holding member according to Modification 2.

  The tapered roller bearing according to the present invention includes an outer ring having a first raceway surface on an inner peripheral surface, an inner ring having a second raceway surface on an outer peripheral surface and disposed coaxially with the outer ring, and a first raceway surface. And a plurality of tapered rollers disposed in a space between the second raceway surfaces, and a lubricant holding member fixed integrally with the outer ring. The outer ring is formed with an annular thin portion at one end in the axial direction by an annular step surface provided on the outer peripheral surface, and the other end in the axial direction is fitted into the housing. The lubricating oil retaining member is formed in a cylindrical shape extending in the axial direction, and has a cylindrical portion disposed so that the end surface on the other side in the axial direction faces the step surface of the outer ring in the axial direction and covers the outer peripheral surface of the thin portion. And an annular portion formed in an annular shape extending in the radial direction and having an end portion on the radially outer side connected to an end portion on one axial side of the cylindrical portion. The cylindrical portion has a convex portion formed on the inner peripheral surface so as to protrude inward in the radial direction. The thin-walled portion has a concave portion formed on the outer peripheral surface so as to accommodate the convex portion and to restrict the movement of the lubricating oil retaining member in the axial direction.

  According to said structure, since the convex part of the cylindrical part of a lubricating oil holding member and the recessed part of the outer peripheral surface of the thin part of an outer ring | wheel are formed corresponding, the convex part of a cylindrical part is made thin. It can be engaged with the recess of the part. Therefore, the lubricating oil holding member can be fixed to the outer ring so that the cylindrical portion covers the outer peripheral surface of the thin portion without press-fitting the inner peripheral surface of the cylindrical portion into the outer peripheral surface of the thin portion.

  Since it is not necessary to press-fit the inner peripheral surface of the cylindrical portion into the outer peripheral surface of the thin portion, high accuracy is not required for the dimensions of the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the thin portion. Therefore, the step of polishing the outer peripheral surface of the thin portion is not required, and the yield of the outer ring can be improved.

  In the tapered roller bearing of the present invention, the distance from the axially inner end surface of the lubricating oil holding member to the axially inner end of the convex portion is from the step surface of the outer ring to the axially inner end of the concave portion. It is preferable that it is more than this distance.

  The tapered roller bearing is attached to the housing on the end surface opposite to the end surface where the thin portion is formed in the outer ring. According to the above configuration, the distance from the axially inner end surface of the lubricant holding member to the axially inner end of the convex portion is from the step surface of the outer ring to the axially inner end of the concave portion. Since it is more than the distance, it becomes difficult for the surface of the convex part of the cylindrical part and the surface of the concave part of the thin part to contact in the axial direction. Therefore, even if a force is applied to the lubricating oil holding member when attaching the tapered roller bearing to the housing, the force applied to the lubricating oil holding member is suppressed from affecting the outer ring via the convex portion and the concave portion. On the other hand, since the axially inner end surface of the cylindrical portion is in axial contact with the step surface of the outer ring, the force applied to the lubricating oil retaining member is applied to the axially inner end surface of the cylindrical portion. It can be effectively transmitted to the outer ring through the contact portion with the step surface of the outer ring. That is, the force applied to the lubricating oil holding member can be effectively used as a force for attaching the outer ring to the housing.

  In the tapered roller bearing of the present invention, it is preferable that the step surface of the outer ring has a surface perpendicular to the axial direction, and the axially inner end surface of the cylindrical portion has a surface perpendicular to the axial direction.

  According to the above configuration, the axially inner end surface of the cylindrical portion and the step surface of the outer ring are in contact with each other via a surface perpendicular to the axial direction. Therefore, when attaching the tapered roller bearing to the housing, the lubricating oil is retained. The force applied to the member can be efficiently transmitted to the outer ring.

  The concave portion of the tapered roller bearing of the present invention is preferably formed in a groove shape over the entire circumference of the outer peripheral surface of the thin portion.

  According to said structure, since a recessed part is formed in groove shape over the perimeter of a thin part, a recessed part can be easily formed by turning. In addition, since the concave portion is formed over the entire circumference, when attaching the lubricant holding member to the outer ring, the convex portion can be engaged with the concave portion without considering the alignment of the concave portion and the convex portion. The operation of attaching the lubricant holding member to the cylinder becomes easy.

  It is preferable that a plurality of convex portions of the tapered roller bearing of the present invention are formed and arranged in the circumferential direction at equal intervals on the inner peripheral surface of the cylindrical portion.

  According to said structure, since a some convex part can be formed by carrying out the dimple process etc. of a cylindrical part, a convex part can be formed easily. In addition, since the plurality of convex portions are arranged at equal intervals, the stability of the cylindrical portion with respect to the outer ring can be improved.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Each drawing referred to in the following description shows, for convenience of description, main members necessary for explaining the present invention among the constituent members of the embodiment of the present invention. Therefore, the present invention can include arbitrary components not shown in the following drawings. In addition, the dimensions of the members in the following drawings do not faithfully represent actual dimensions, dimensional ratios of the members, or the like.

<Embodiment 1>
FIG. 1 is a sectional view of a tapered roller bearing 1 according to the first embodiment. FIG. 1 is a cross-sectional view of the tapered roller bearing 1 passing through the outer ring central axis L1. The tapered roller bearing 1 is used, for example, as a bearing that indicates a shaft of a transmission such as an automobile. In the present specification, the term “axial direction” simply means the axial direction of the outer ring central axis L1.

  As shown in FIG. 1, the tapered roller bearing 1 includes an outer ring 10, an inner ring 20, a plurality of tapered rollers 30, a cage 40, and a lubricating oil holding member 50. The outer ring 10, the inner ring 20, the cage 40 and the lubricating oil holding member 50 are annular members provided coaxially with the outer ring central axis L <b> 1 of the tapered roller bearing 1. The lubricating oil holding member 50 is a member having a function of storing the lubricating oil J in the space between the lubricating oil holding member 50 and the outer ring 10 by being attached to the outer ring 10.

  As shown in FIG. 1, the outer ring 10 and the inner ring 20 are arranged so that the inner ring 20 fits inside the outer ring 10 in the radial direction. A plurality of tapered rollers 30 are arranged in a space sandwiched between the outer ring 10 and the inner ring 20 in the radial direction. The cage 40 holds a plurality of tapered rollers 30. The lubricant holding member 50 is attached to one end of the outer ring 10 in the axial direction.

  The tapered roller 30 has a conical shape. The central axis L2 of the tapered roller 30 is inclined with respect to the outer ring central axis L1. The center axis L2 of the roller is the outer ring central axis as it goes from the bottom surface 31 (hereinafter also referred to as the small end surface 31) of the tapered roller 30 toward the bottom surface 32 (hereinafter also referred to as the large end surface 32) of the large diameter side. Separated from L1.

  In the following description of the present specification, among the axial directions, the direction on the back surface 23 side of the inner ring 20 is referred to as “one side”, and the direction on the front surface 24 side is referred to as “the other side”. In the structure of the end portion on one side in the axial direction of the tapered roller bearing 1 (for example, the lubricating oil retaining member 50), the outer side in the axial direction of the tapered roller bearing 1 corresponds to one side. Further, the axially inner side of the tapered roller bearing 1 corresponds to the other side.

  FIG. 2 is an enlarged sectional view of a part of the tapered roller bearing 1.

  The outer ring 10 has a first raceway surface 11 on the inner peripheral surface. The first raceway surface 11 has a tapered shape in which the distance from the outer ring central axis L1 increases from the other side in the axial direction toward the one side.

  An annular step surface 13 is formed on the outer peripheral surface 12 of the outer ring 10 along the circumferential direction. The step surface 13 is a surface perpendicular to the outer ring central axis L1. In the outer ring 10, one axial side of the step surface 13 is a thin portion 14 having a smaller radial thickness than the other side. The step surface 13 and the thin portion 14 are formed to fix the lubricating oil holding member 50 to the outer ring. The outer peripheral surface 15 of the thin portion 14 is a cylindrical surface parallel to the outer ring central axis L1.

  FIG. 3 is a cross-sectional view showing a part of the lubricant holding member 50 and the outer ring 10. An annular groove 16 is formed in the outer peripheral surface 15 of the thin portion 14 of the outer ring 10. The groove 16 opens outward in the radial direction. The groove 16 has a triangular cross section, for example.

  As shown in FIG. 2, the inner ring 20 has a second raceway surface 22 on the outer peripheral surface. The second raceway surface 22 has a tapered shape in which the distance from the outer ring central axis L1 increases from the other side in the axial direction toward the one side. The taper angle of the second raceway surface 22 with respect to the outer ring central axis L1 is smaller than the taper angle of the first raceway surface 11.

  The other side of the inner race 20 in the axial direction from the second raceway surface 22 is formed such that the radial dimension is larger than the end of the second raceway surface 22 on the other side in the axial direction. A small brim 25 facing the end face 31 is formed. In addition, one axial direction side of the inner race 20 with respect to the second raceway surface 22 is formed such that the radial dimension is larger than the end portion on the one axial side side of the second raceway surface 22, and the tapered roller 30. A large collar portion 26 is formed to face the large end surface 32 of the first and second large end surfaces 32.

  As shown in FIG. 2, the tapered roller 30 is disposed in a space formed between the first raceway surface 11 and the second raceway surface 22. As described above, each of the plurality of tapered rollers 30 has a truncated cone shape, and the center axis L2 of the roller is inclined with respect to the outer ring center axis L1.

  Although not shown, the cage 40 has an annular shape having a tapered surface that increases in distance from the outer ring central axis L1 from the other side in the axial direction toward the one side. A plurality of pockets 41 are formed on the tapered surface of the cage 40. Each of the plurality of pockets 41 on the tapered surface has a substantially trapezoidal shape corresponding to the shape of the tapered roller 30. The cage 40 is made of metal or resin.

  As shown in FIG. 3, the lubricant holding member 50 includes a ring 60 and an elastic lip 70.

  The ring 60 includes a cylindrical ring main body 61 and an annular claw 62 protruding radially inward from the inner peripheral surface of the ring main body 61. The ring body 61 and the claw 62 are integrally formed. The inner diameter of the ring body 61 is such that it can be fitted to the outer side of the outer peripheral surface 15 of the thin portion 14 of the outer ring 10. The claw 62 is formed outside the ring body 61 in the axial direction. The ring 60 is formed of, for example, a metal such as stainless steel.

  The end surface 63 on the other axial side of the ring body 61 is an annular surface disposed substantially parallel to the step surface 13. The end surface 63 is a surface perpendicular to the outer ring central axis L1. Further, the inner peripheral surface 64 of the ring body 61 is a cylindrical surface disposed substantially parallel to the outer peripheral surface 15 of the thin portion 14 of the outer ring 10.

  A plurality of convex portions 65 are formed on the ring body 61. The plurality of convex portions 65 protrude radially inward from the inner peripheral surface 64 and fit into the grooves 16 formed on the outer peripheral surface 15 of the thin-walled portion 14 in a state where the lubricating oil retaining member 50 is fixed to the outer ring 10. It is formed at a position where it can fit. That is, the plurality of convex portions 65 are spaced apart from each other in the circumferential direction. For example, 3 to 10 convex portions 65 are formed.

  The distance (the length indicated by “A” in FIG. 3) from the end surface 63 on the other axial side of the ring body 61 to the end 65 a on the other axial side of the convex portion 65 is from the step surface 13 of the outer ring 10 to the groove 16. Is set to be larger than the distance (the length indicated by “B” in FIG. 3) to the other end 16a in the axial direction. Therefore, when the end surface 63 of the ring body 61 is in contact with the stepped surface 13 of the outer ring 10, the end 65 a on the other axial side of the convex portion 65 does not contact the end 16 a on the other axial side of the groove 16. .

  The height of the plurality of convex portions 65 protruding radially inward from the inner peripheral surface of the ring body 61 is set to be smaller than the depth of the recess from the outer peripheral surface 15 of the thin portion 14 of the groove 16. Further, the axial width of the groove 16 (the length indicated by “C” in FIG. 3 connecting the end portion 16a and the end portion 16b on the one axial side of the groove 16) is the axial width of the convex portion 65 ( It is set to be larger than the length (the length connecting the end portion 65a and the end portion 65b on one side in the axial direction of the convex portion 65) indicated by "D" in FIG. Therefore, in a state where the convex portion 65 is accommodated in the groove 16, a gap exists between the surface of the convex portion 65 and the inner wall of the groove 16.

  The plurality of convex portions 65 are formed, for example, by dimple processing from the outer peripheral surface of the ring body 61 inward in the radial direction. When the convex portion 65 is formed by dimple processing, a recess corresponding to a location where the convex portion 65 is formed on the outer peripheral surface of the ring body 61 is formed.

  The shape of the elastic body lip 70 is an annular shape as a whole. A portion of the elastic lip 70 constituting the outer side in the radial direction is a thick portion 71 whose axial thickness is larger than the thickness of the claw 62 of the ring 60. In addition, the portion of the elastic lip 70 that constitutes the radially inner portion is a thin portion 72 having a smaller axial thickness than the thick portion 71. The elastic lip 70 is made of rubber such as nitrile rubber or acrylic rubber, for example.

  In the elastic body lip 70, the thick part 71 and the thin part 72 are continuously formed integrally. That is, on the surface on the inner side in the axial direction of the elastic lip 70, the surface 71 b of the thick part 71 is positioned on the inner side in the axial direction than the surface 72 b of the thin part 72.

  Groove 73 is formed in thick portion 71 from the outside to the inside in the radial direction. The groove 73 is formed over the entire circumference of the thick portion 71. The size of the groove 73 is set such that the claw 62 of the ring 60 can be fitted. By fitting the claw 62 into the groove 73, the ring 60 and the elastic lip 70 are combined together to constitute the lubricating oil holding member 50.

  In addition, the ring 60 and the elastic body lip 70 are integrally combined so that the shape of the lubricating oil retaining member 50 is a shape in which the annular portion 51 and the cylindrical portion 52 are integrated. It has become. The annular portion 51 corresponds to the claw 62 and the elastic body lip 70 of the ring 60. The cylindrical portion 52 corresponds to the ring main body 61.

  As shown in FIG. 3, in the ring 60, the inner peripheral surface 64 of the ring main body 61 covers the outer peripheral surface 15 of the thin portion 14 of the outer ring 10, and the end surface 63 on the other axial side of the ring main body 61 is the stepped surface of the outer ring 10. 13 is fitted into the end of one side of the outer ring 10 in the axial direction so as to face the outer ring 10. At this time, when the ring 60 is fitted from the axial direction, the convex portion 65 hits the outer peripheral surface 15, and the ring 60 is elastically deformed, so that the convex portion 65 is accommodated in the groove 16 beyond the outer peripheral surface. As a result, the outer ring 10 and the lubricant holding member 50 are fixed.

  At this time, the plurality of convex portions 65 are accommodated in the groove 16. Thereby, the movement of the lubricating oil holding member 50 in the axial direction is restricted, and the lubricating oil holding member 50 can be prevented from falling off the outer ring 10.

  Lubricating oil J is supplied to the space formed between the lubricating oil retaining member 50 and the outer ring 10 as shown in the lower part of FIG. The lubricating oil J accumulates in the lower part of the tapered roller bearing 1 on the lower side in the vertical direction. The height of the liquid surface S1 of the lubricating oil J is the height of the elastic lip 70 at the lowermost portion of the tapered roller bearing 1.

  In the stationary state of the tapered roller bearing 1, the lubricating oil J is in contact with a part of the outer ring 10, a part of the tapered roller 30, and a part of the cage 40. When the tapered roller bearing 1 rotates, the lubricating oil J accumulated in the lower portion of the tapered roller bearing 1 is wound up together with the rotation and supplied to the first raceway surface 11 and the second raceway surface 22 and the like. The supplied lubricating oil J reduces the friction generated between the tapered roller 30 and the first raceway surface 11 or between the tapered roller 30 and the second raceway surface 22.

  As shown in FIG. 2, the tapered roller bearing 1 having the above configuration is fitted into the housing 200 so that the outer peripheral surface of the outer ring 10 is in contact with the housing 200. In the operation of fitting the tapered roller bearing 1 into the housing 200, the operator pushes the annular portion 51 of the lubricant holding member 50 fixed to the outer ring 10. At this time, the force applied to the annular portion 51 by the operator is transmitted from the end surface 63 of the ring body 61 to the step surface 13 of the outer ring 10 and used as a force for fitting the outer ring 10 into the housing 200.

  Although not shown in FIG. 2, for example, a ring made of a disc spring or the like may exist between the tapered roller bearing 1 and the housing 200.

(Effect of Embodiment 1)
According to the tapered roller bearing 1 of the first embodiment, the plurality of convex portions 65 formed in the ring body 61 are accommodated in the groove 16, whereby the axial movement of the lubricating oil holding member 50 is restricted, and the lubricating oil The holding member 50 can be prevented from falling off the outer ring 10. Therefore, the lubricating oil holding member 50 can be fixed to the outer ring 10 without the lubricating oil holding member 50 being fitted into the thin portion 14 of the outer ring 10.

  When the lubricating oil retaining member is fitted to the thin part of the outer ring, it is necessary to set the inner diameter of the lubricating oil retaining member to be slightly smaller than the outer diameter of the thin part of the outer ring. High accuracy is required for the dimensions of the inner peripheral surface of the oil retaining member and the outer peripheral surface of the thin wall portion. However, according to the tapered roller bearing 1 of the present embodiment, the lubricating oil retaining member 50 does not need to be tightly fitted to the thin portion 14 of the outer ring 10, so the dimensions of the inner peripheral surface of the ring body 61 and the thin portion 14 High accuracy is not required for the dimensions of the outer peripheral surface. Therefore, the process of polishing the outer peripheral surface of the thin wall portion is unnecessary, and the yield of the outer ring 10 can be improved.

  As shown in FIG. 2, the tapered roller bearing 1 according to the first embodiment is attached to the housing 200 on the end face on one axial side of the outer ring 10. According to the above configuration, the distance (the length indicated by “A” in FIG. 3) from the end surface 63 on the other axial side of the ring body 61 to the end on the other axial side of the convex portion 65 is the length of the outer ring 10. It is set to be larger than the distance (the length indicated by “B” in FIG. 3) from the step surface 13 to the end on the other axial side of the groove 16. Therefore, when the end surface 63 of the ring main body 61 is in contact with the stepped surface 13 of the outer ring 10, the end portion on the other axial side of the convex portion 65 does not contact the end portion on the other axial side of the groove 16.

  Therefore, when a force is applied to the lubricating oil retaining member 50 in order to attach the tapered roller bearing 1 to the housing 200, the ring main body 61 of the lubricating oil retaining member 50 is on the other side in the axial direction of the convex portion 65 of the ring main body 61. The end surface 63 of the ring body 61 comes into contact with the step surface 13 of the outer ring 10 before the end portion contacts the surface of the groove 16. As a result, the force applied to the lubricating oil retaining member 50 can be effectively transmitted to the outer ring 10 through the contact portion between the end surface 63 of the ring body 61 and the step surface 13 of the outer ring 10. That is, the force applied to the lubricating oil holding member 50 can be effectively used as a force for attaching the outer ring 10 to the housing 200.

  Further, when a force is applied to the lubricating oil retaining member 50 in order to attach the tapered roller bearing 1 to the housing 200, the ring main body 61 of the lubricating oil retaining member 50 is on the other axial side of the convex portion 65 of the ring main body 61. The end surface 63 of the ring body 61 comes into contact with the step surface 13 of the outer ring 10 before the end portion contacts the surface of the groove 16. Therefore, the force applied to the lubricating oil retaining member 50 is suppressed from being transmitted in the radial direction from the convex portion 65 to the outer ring 10 via the surface of the groove 16, and the deformation of the ring body 61 can be suppressed. it can.

  According to the tapered roller bearing 1 of the first embodiment, when the tapered roller bearing 1 is attached to the housing 200, the end surface 63 of the ring body 61 perpendicular to the outer ring central axis L1 and the outer ring perpendicular to the outer ring central axis L1. 10 step surfaces 13 come into contact with each other. Therefore, the force applied to the lubricating oil holding member 50 can be efficiently transmitted to the outer ring 10.

  Since the groove 16 is formed over the entire circumference in the thin portion 14 of the outer ring 10 of the tapered roller bearing 1 of the first embodiment, the groove 16 can be easily formed by turning. Further, since the groove 16 is formed over the entire circumference, when attaching the lubricant holding member 50 to the outer ring 10, the convex portion 65 can be formed without considering the alignment in the circumferential direction of the groove 16 and the convex portion 65. The groove 16 can be engaged, and the operation of attaching the lubricant holding member 50 to the outer ring 10 is facilitated.

  Since the convex portion 65 of the tapered roller bearing 1 according to the first embodiment is formed, for example, by dimple processing or the like on the metal ring body 61, the formation is easy. In addition, since the plurality of convex portions are arranged at equal intervals, the stability of the cylindrical portion with respect to the outer ring can be improved.

<Modification of Embodiment 1>
In the first embodiment, the tapered roller bearing 1 in which a plurality of convex portions 65 are formed on the ring main body 61 of the lubricating oil retaining member 50 has been described. However, the convex portions are formed in an annular shape on the outer peripheral surface of the ring main body 61. May be.

  Moreover, although Embodiment 1 illustrated about the case where the cross-sectional shape of the groove | channel 16 and the convex part 65 is a substantially triangular shape, the shape of the groove | channel 16 and the convex part 65 of this invention is not limited to this. For example, the cross-sectional shape of the groove and the convex portion may be a substantially rectangular shape or a substantially semicircular shape. Further, for example, when the cross-sectional shape of the groove is substantially rectangular and the cross-sectional shape of the convex portion is substantially semicircular, the shape of the groove and the convex portion may be different.

  In the first embodiment, the end surface 63 of the ring main body 61 and the step surface 13 of the outer ring 10 are both perpendicular to the outer ring central axis L1, but this is not an essential configuration of the present invention. For example, the end surface 63 of the ring main body 61 and the stepped surface 13 of the outer ring 10 may be tapered surfaces that are inclined from the other side to the one side as going from the radially inner side to the outer side.

  In the first embodiment, it has been described that the outer circumferential surface 15 of the thin portion 14 of the outer ring 10 is formed with the annular groove 16 extending in the circumferential direction as a concave portion. However, the shape of the concave portion formed in the thin portion 14 is as follows. It is not limited to grooves. For example, instead of the groove 16, a plurality of recesses may be formed. In this case, the plurality of recesses are formed at positions corresponding to the plurality of projections 65 formed on the ring main body 61 of the lubricant holding member 50 so as to be separated in the circumferential direction.

  Further, as shown as Modification 1 in FIG. 4, instead of the groove 16, the thin portion 14A of the outer ring 10A includes the first thin portion 141A and the second thin portion 142A, so that a concave portion is formed in the thin portion 14A. It may be.

  In this case, the first thin portion 141A has a smaller diameter than the second thin portion 142A and is disposed on the other axial side of the second thin portion 142A. Therefore, in the outer peripheral surface 15A of the thin portion 14A, the outer peripheral surface of the first thin portion 141A constitutes a recess 16A that is recessed from the outer peripheral surface of the second thin portion 142A. The convex portion 65 formed on the ring main body 61A of the lubricating oil retaining member 50 is accommodated in the concave portion 16A on one axial side of the concave portion 16A. Therefore, the space 161A exists on the other axial side of the convex portion 65A.

  Further, as shown as Modification 2 in FIG. 5, a convex portion 65 </ b> B is formed at the end on the other axial side of the ring body 61 of the ring member 60, and the end on the other axial side of the thin portion 14 </ b> B of the outer ring 10. A recess 16B may be formed in the part. By so doing, the axial size of the thin portion 14B of the outer ring 10 can be reduced, and the rigidity of the outer ring 10 can be improved.

  Further, according to the tapered roller bearing of the second modification, the end portion 65Ba on the other axial side of the convex portion 65B and the end surface 63B on the other axial side of the ring body 61B are the same. Further, the step surface 13 of the outer ring 10 and the end 16Ba on the other axial side of the recess 16 are the same. Therefore, when a force is applied to the lubricant holding member 50 to attach the outer ring 10 to the housing, the end 65Ba on the other axial side of the convex portion 65 of the ring body 61 of the lubricant holding member 50 is the surface of the groove 16B. At the same time, the end surface 63B on the other axial side of the ring main body 61B contacts the step surface 13. Therefore, even if there is a gap between the step surface 13 of the outer ring 10 and the end surface 63B on the other axial side of the ring main body 61B, the force applied to the lubricating oil retaining member 50 is reliably applied to the outer ring 10. Can communicate.

  As mentioned above, embodiment mentioned above is only the illustration for implementing this invention. Therefore, the present invention is not limited to the above-described embodiment, and can be implemented by appropriately modifying the above-described embodiment without departing from the spirit thereof.

DESCRIPTION OF SYMBOLS 1 Tapered roller bearing 10 Outer ring 12 Outer ring outer peripheral surface 13 Step surface 14 Thin wall portion 16 Groove (concave portion)
20 Inner ring 30 Tapered roller 50 Lubricating oil holding member 51 Annular portion 52 Tubular portion 65 Convex portion

Claims (5)

An outer ring having a first raceway surface on the inner peripheral surface;
An inner ring having a second raceway surface on the outer peripheral surface and disposed coaxially with the outer ring;
A plurality of tapered rollers disposed in a space between the first raceway surface and the second raceway surface;
A lubricant holding member fixed integrally with the outer ring;
A tapered roller bearing with
The outer ring is formed with an annular thin portion at one end in the axial direction by an annular step surface provided on the outer peripheral surface, and the other end in the axial direction is fitted into the housing,
The lubricating oil holding member is
A cylindrical portion that is formed in a cylindrical shape extending in the axial direction, and is disposed so that the end surface on the other side in the axial direction faces the step surface of the outer ring in the axial direction and covers the outer peripheral surface of the thin portion;
An annular portion formed in an annular shape extending in the radial direction, and an end portion on the radially outer side connected to an end portion on one axial side of the cylindrical portion;
Including
The cylindrical part has a convex part formed to project radially inward on the inner peripheral surface,
The thin-walled portion is a tapered roller bearing having, on an outer peripheral surface thereof, a concave portion that can accommodate the convex portion and is formed so as to restrict movement of the lubricating oil retaining member in the axial direction. The tapered roller bearing according to claim 1,
The distance from the axially inner end surface of the lubricating oil holding member to the axially inner end portion of the convex portion is equal to or greater than the distance from the step surface of the outer ring to the axially inner end portion of the concave portion. It is a tapered roller bearing. In the tapered roller bearing according to claim 1 or 2,
The step surface of the outer ring has a surface perpendicular to the axial direction,
A tapered roller bearing in which the axially inner end surface of the cylindrical portion has a surface perpendicular to the axial direction. In the tapered roller bearing according to any one of claims 1 to 3,
The concave portion is a tapered roller bearing formed in a groove shape over the entire circumference of the outer peripheral surface of the thin portion. In the tapered roller bearing according to any one of claims 1 to 4,
A tapered roller bearing in which a plurality of the convex portions are formed and arranged on the inner peripheral surface of the cylindrical portion in the circumferential direction at equal intervals.

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