JP2015132351A - Double row rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double row rolling bearing capable of supplying grease from an inner periphery to an outer periphery of an inner ring with a small number of components.SOLUTION: In a double row rolling bearing constituted by connecting a first inner ring 20 and a second inner ring 30 by a retaining ring 80 in a state of keeping the first inner ring 20 and the second inner ring 30 into contact with each other, at least one of a second side end face and a first side end face is provided with through grooves 29, 39 formed at equal intervals in the circumferential direction while penetrating in the radial direction. The retaining ring 80 has a cutout on at least one place of the circumference, and is provided with a plurality of through holes penetrated in the radial direction. Widths in the circumferential direction are successively reduced in the order of the cutout, the through grooves and the through holes, the cutout may not be communicated with the through grooves due to a circumferential position of the cutout, and the through holes are formed at unequal intervals in the circumferential direction to be communicated with at least one of the plurality of through grooves 29, 39 regardless of the circumferential position to be not communicated with the through grooves, of the cutout.

Description

  The present invention relates to a double-row rolling bearing in which inner rings are arranged in two rows in the axial direction.

  As a double row rolling bearing, there exists a thing as shown, for example in patent document 1. FIG.

  In this case, with the end faces of the two inner rings in contact with each other, a ring-shaped retaining ring is arranged so as to contact the inner periphery at a position straddling the two inner rings, and the two inner rings are connected. doing.

JP 2004-197790 A

  The retaining ring prevents grease from being supplied from the inner periphery to the outer periphery between the end faces of the two inner rings. If an inner ring spacer is arranged between the two inner rings and a through hole is formed in the inner ring spacer in the radial direction, grease can be supplied from the inner periphery to the outer periphery of the inner ring. Therefore, the number of parts increases. The present invention has been made to solve the above-described problems, and the object thereof is to connect two inner rings with a small number of parts and to supply grease from the inner periphery to the outer periphery of the inner ring. An object of the present invention is to provide a double row rolling bearing.

  Claim 1 is arranged corresponding to the first outer ring raceway surface on the inner circumference side of the outer ring, the outer ring formed by shifting the first outer ring raceway surface and the second outer ring raceway surface axially relative to each other on the inner circumference, A first inner ring having a first inner ring raceway surface formed on the outer periphery, a second inner ring disposed on the inner peripheral side of the outer ring corresponding to the second outer ring raceway surface, and forming a second inner ring raceway surface on the outer periphery; A first rolling element that rolls on the first outer ring raceway surface and the first inner ring raceway surface; a second rolling element that rolls on the second outer ring raceway surface and the second inner ring raceway surface; A ring-shaped retaining ring disposed in contact with the inner periphery at a position straddling the first inner ring and the second inner ring, the second inner end side second end surface of the first inner ring, The first inner ring is moved by the retaining ring in a state in which the first inner end of the two inner rings are in contact with each other. And in the double row rolling bearing formed by connecting the second inner rings, at least one of the second side end face and the first side end face is formed with radial through holes at equal intervals in the circumferential direction, The retaining ring has an elastic function of reducing the diameter in the inner diameter direction and elastically returning in the outer diameter direction, forming a notch at one circumferential position, and spacing the through holes penetrating in the radial direction in the circumferential direction. It is characterized in that a plurality are formed with a gap.

  According to the first aspect, the retaining ring has an elastic function of reducing the diameter in the inner diameter direction and elastically returning in the outer diameter direction, forming a notch in one place on the circumference and penetrating in the radial direction. Is used with a plurality of bearings spaced apart in the circumferential direction, so it is possible to connect two inner rings with a small number of parts and to supply grease from the inner circumference to the outer circumference of the inner ring Can be provided.

  According to a second aspect of the present invention, in the first aspect, the retaining ring includes a cylindrical belt portion and a pair of flange portions protruding in the outer diameter direction from both sides in the axial direction of the belt portion. On the inner periphery of the second inner ring, a storage surface for storing the band portion is formed, and a pair of engagement grooves for storing the pair of flange portions are formed, and the first inner ring or the second inner ring is formed. When the inner ring is inserted into the inner circumference, the retaining ring is reduced in diameter in the inner diameter direction, and when the pair of flanges correspond to the pair of engaging grooves, the retaining ring is elastically returned in the outer diameter direction. It is characterized by this.

  According to claim 2, the retaining ring has an elastic function of reducing the diameter in the inner diameter direction and elastically returning in the outer diameter direction, forming a notch in one place on the circumference and penetrating in the radial direction. Is used with a plurality of bearings spaced apart in the circumferential direction, so it is possible to connect two inner rings with a small number of parts and to supply grease from the inner circumference to the outer circumference of the inner ring Can be provided. When the retaining ring elastically recovers in the outer diameter direction, the pair of flanges are inserted into the pair of engaging grooves, and the outer periphery of the band portion comes into surface contact with the storage surface. Therefore, the first inner ring 20 and the second inner ring 30 Can be connected more reliably.

  According to a third aspect of the present invention, in the first or second aspect, the circumferential width decreases in the order of the notch, the through groove, and the through hole. There is a case where the notch communicates with the through groove and a case where the notch does not communicate with the through groove, and the through hole is located at any position in the circumferential direction where the notch does not communicate with the through groove. It is characterized by being formed at unequal intervals in the circumferential direction so as to communicate with at least one of the plurality of through grooves.

  According to claim 3, the retaining ring has an elastic function of reducing the diameter in the inner diameter direction and elastically returning in the outer diameter direction, forming a notch in one place on the circumference and penetrating in the radial direction. Is used with a plurality of bearings spaced apart in the circumferential direction, so it is possible to connect two inner rings with a small number of parts and to supply grease from the inner circumference to the outer circumference of the inner ring Can be provided. The circumferential width of the notch, the through groove, and the through hole becomes smaller in the order of the notch, the through groove, and the through hole. Depending on the position of the notch in the circumferential direction, the notch communicates with the through groove. In some cases, the through hole does not communicate with the through groove, and the through hole communicates with at least one of the plurality of through grooves at any position in the circumferential direction where the notch does not communicate with the through groove. Since they are formed at irregular intervals in the circumferential direction, grease can be supplied more reliably from the inner circumference to the outer circumference of the inner ring.

  According to the configuration described above, it is possible to provide a double-row rolling bearing that connects two inner rings with a small number of parts and that can supply grease from the inner periphery to the outer periphery of the inner ring.

It is a longitudinal cross-sectional view of the double row rolling bearing concerning one Embodiment of this invention. It is an expanded sectional view of FIG. 1 concerning one Embodiment of this invention. It is the sectional view on the AA line of FIG. 1 concerning one Embodiment of this invention. FIG. 4 is a state diagram in which the notch is shifted counterclockwise with respect to FIG. 3 according to the embodiment of the present invention. FIG. 5 is a state diagram in which the notch is shifted counterclockwise with respect to FIG. 4 according to the embodiment of the present invention. FIG. 6 is a state diagram in which the notch is shifted counterclockwise with respect to FIG. 5 according to the embodiment of the present invention. FIG. 7 is a state diagram in which the notch is shifted counterclockwise with respect to FIG. 6 according to the embodiment of the present invention.

  A double row rolling bearing 10 according to an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the double-row rolling bearing 10 is used for a chock wheel, and the first inner ring 20 and the second inner ring 30 arranged in two rows in the axial direction are connected by a retaining ring 80 so as to be easily disassembled.

  The double row rolling bearing 10 has an outer ring 11 formed by shifting the first outer ring raceway surface 13 and the second outer ring raceway surface 15 in the axial direction on the inner circumference, and the first outer ring raceway surface 13 on the inner circumference side of the outer ring 11. The first inner ring 20 is disposed corresponding to the first inner ring 20 having the first inner ring raceway surface 23 formed on the outer periphery, and the second inner ring raceway surface 33 is disposed on the outer periphery. On the formed second inner ring 30, on the first outer ring raceway surface 13 and on the first inner ring raceway surface 23, on the second outer ring raceway surface 15 and on the second inner ring raceway surface 33. A second rolling element 45 that rolls, a ring-shaped retaining ring 80 disposed in contact with the inner periphery at a position straddling the first inner ring 20 and the second inner ring 30, and a plurality of first rolling elements 40 The first cage 50 arranged at equal intervals in the circumferential direction and the plurality of second rolling elements 45 are equally spaced in the circumferential direction. And a second retainer 60 to be disposed.

  The outer ring 11 has a substantially cylindrical shape. A cylindrical, large-diameter first fitting surface 14, a tapered first outer ring raceway surface 13, a cylindrical, small-diameter cylindrical surface 12, and a tapered second outer ring raceway are disposed on the inner periphery of the outer ring 11. A surface 15 and a cylindrical and large-diameter second fitting surface 16 are formed in order from one end. The outer periphery of the first oil seal 90 is fitted and fixed to the first fitting surface 14, and the inner periphery of the first oil seal 90 is in sliding contact with the first sliding surface 25 of the first inner ring 20. The outer periphery of the second oil seal 95 is fitted and fixed to the second fitting surface 16, and the inner periphery of the second oil seal 95 is in sliding contact with the second sliding surface 35 of the second inner ring 30.

  The first inner ring 20 has a substantially cylindrical shape. On the outer periphery of the first inner ring 20, a cylindrical first large-diameter sliding surface 25, a first large-diameter side end face 24 extending in the inner diameter direction, a tapered first inner ring raceway surface 23, and an outer diameter direction A first small-diameter-side end surface 22 extending in the direction of a taper and a tapered first tapered surface 21 are formed in order from one end.

  The second inner ring 30 has a substantially cylindrical shape. On the outer periphery of the second inner ring 30, a cylindrical, large-diameter second sliding surface 35, a second large-diameter side end surface 34 extending in the inner diameter direction, a tapered second inner ring raceway surface 33, and an outer diameter direction A second small-diameter side end surface 32 and a tapered second tapered surface 31 are formed in order from the other end.

  The first rolling element 40 has a conical shape with a top portion cut. The first rolling element 40 is in contact with the first outer ring raceway surface 13 and the first inner ring raceway surface 23 so as to allow rolling. The large diameter side end surface of the first rolling element 40 is in sliding contact with the first large diameter side end surface 24 of the first inner ring 20. The small diameter side end surface of the first rolling element 40 has a gap with the first small diameter side end surface 22 of the first inner ring 20.

  The second rolling element 45 has a conical shape with a top portion cut. The second rolling element 45 is in contact with the second outer ring raceway surface 15 and the second inner ring raceway surface 33 so as to allow rolling. The large diameter side end surface of the second rolling element 45 is in sliding contact with the second large diameter side end surface 34 of the second inner ring 30. The small diameter side end surface of the second rolling element 45 has a gap with the second small diameter side end surface 32 of the second inner ring 30.

  The first cage 50 is formed by bending a thin plate with a press, and is formed in a tapered shape. The first cage 50 is formed with first pockets 51 at equal intervals in the circumferential direction, and the first rolling elements 40 are rotatably held in the first pockets 51.

  The second cage 60 is formed by bending a thin plate with a press and has a tapered shape. Second pockets 61 are formed in the second cage 60 at equal intervals in the circumferential direction, and the second rolling elements 45 are rotatably held in the second pockets 61.

  A second side end surface is formed on the second inner ring 30 side of the first inner ring 20, a first side end surface is formed on the first inner ring 20 side of the second inner ring 30, and the second side end surface and the first side end surface are surfaces of each other. In contact. A first through groove 29 having a semicircular cross section is formed in the second side end surface so as to penetrate in the radial direction. The first through grooves 29 are formed at equal intervals of 90 degrees in the circumferential direction. A second through groove 39 having a semicircular cross section is formed in the first side end surface so as to penetrate in the radial direction. The second through grooves 39 are formed at equal intervals of 90 degrees in the circumferential direction. By making the first through groove 29 and the second through groove 39 coincide with each other, a through passage having a circular cross section is formed.

  As shown in FIG. 2, the retaining ring 80 includes a cylindrical band portion 81, a first flange portion 82 projecting in the outer diameter direction from one axial end of the band portion 81, and the other axial end of the band portion 81. It consists of the 2nd collar part 83 which protruded in the outer-diameter direction more. As shown in FIG. 3, the retaining ring 80 has a ring shape, and a notch 85 is formed at one circumferential position over an angular range of about 58 degrees, and a plurality of circumferentially penetrating holes are formed at a plurality of circumferential positions. Through-holes 86, 87, 88 are formed. The retaining ring 80 is made of an iron-based material, and has an elastic function of reducing the diameter in the inner diameter direction by being annealed and elastically returning to the outer diameter direction. After forming the notch 85 and the plurality of through holes 86, 87, 88, annealing is performed.

  As shown in FIGS. 1 and 2, a cylindrical first shaft cylindrical surface 26, a first engagement groove 27 extending in the outer diameter direction, and a first shaft cylindrical surface 26 are provided on the inner periphery of the first inner ring 20. A first storage surface 28 having a large diameter and a cylindrical shape is formed in order from one end. The first flange 82 is inserted into the first engagement groove 27, and the outer periphery of the band portion 81 is in surface contact with the first storage surface 28. The first engagement groove 27 has a groove depth that can accommodate the first flange portion 82, and the first storage surface 28 has a groove depth that can accommodate the band portion 81.

  On the inner periphery of the second inner ring 30, a cylindrical second shaft cylindrical surface 36, a second engagement groove 37 extending in the outer diameter direction, and a second cylindrical shape larger in diameter than the second shaft cylindrical surface 36. A storage surface 38 is formed in order from the other end. The second flange 83 is inserted into the second engagement groove 37, and the outer periphery of the band 81 is in surface contact with the second storage surface 38. The first engagement groove 27 has a groove depth that can accommodate the first flange portion 82, and the first storage surface 28 has a groove depth that can accommodate the band portion 81.

  The first brim portion 82 is inserted into the first engagement groove 27, the second brim portion 83 is inserted into the second engagement groove 37, and the outer periphery of the band portion 81 is placed on the first storage surface 28 and the second storage surface 38. The first inner ring 20 and the second inner ring 30 are connected by surface contact.

  As shown in FIGS. 1 and 3, a columnar support shaft 70 is fitted to the first shaft cylindrical surface 26 and the second shaft cylindrical surface 36. On the outer periphery of the support shaft 70, an annular groove 73 continuous in the circumferential direction is formed at an axial position corresponding to the notch 85 and the through holes 86, 87, 88. A second supply passage 72 is formed in the support shaft 70 in the inner diameter direction from the annular groove 73, and a first supply passage 71 is formed in the axial direction from the inner diameter side of the second supply passage 72. A plurality of second supply passages 72 are formed at equal intervals every 90 degrees in the circumferential direction.

  As shown in FIG. 3, the circumferential width decreases in the order of the notch 85, the first through groove 29, the second through groove 39, and the through holes 86, 87, 88. In other words, the hole diameter decreases in the order of the through passage and the through holes 86, 87, 88. For this reason, the probability that the notch 85 and the through passage communicate with each other is higher than the probability that the through passage and the through holes 86, 87, 88 communicate with each other. The through holes 86, 87, and 88 are provided for communicating with the through passage when the notch 85 and the through passage do not communicate with each other.

  Depending on the position of the notch 85 in the circumferential direction, the notch 85 may or may not communicate with the through passage, and the through holes 86, 87, and 88 have the notch 85 as the through passage. It is formed at unequal intervals in the circumferential direction so as to communicate with at least one of the plurality of through passages at any position in the circumferential direction that does not communicate. The through hole 86, the through hole 87, and the through hole 88 are formed so as to be farther from the notch 85 in the order of the through hole 86, the through hole 87, and the through hole 88. FIG. 4 shows a state in which the retaining ring 80 is attached at a position shifted counterclockwise compared to FIG. One of the two through holes 88 corresponds to the second through groove 39 on the left side, that is, the through passage. FIG. 5 shows a state in which the retaining ring 80 is attached at a position shifted counterclockwise compared to FIG. One of the two through holes 86 corresponds to the upper second through groove 39, that is, the through passage. FIG. 6 shows a state in which the retaining ring 80 is attached at a position shifted counterclockwise compared to FIG. One of the two through holes 89 corresponds to the lower second through groove 39, that is, the through passage. FIG. 7 shows a state in which the retaining ring 80 is attached at a position shifted counterclockwise compared to FIG. The two through holes 87 correspond to the upper second through groove 39 and the left second through groove 39, that is, the through passage.

  Next, the assembly operation of the double row rolling bearing 10 will be described.

  The first inner ring 20 is arranged so that the first large-diameter side end face 24 faces downward and the first small-diameter side end face 22 faces upward. The plurality of first rolling elements 40 are placed on the first large-diameter side end surface 24, and the rolling surfaces of the first rolling elements 40 are brought into contact with the first inner ring raceway surface 23. The plurality of first rolling elements 40 are arranged at equal intervals in the circumferential direction of the first inner ring 20. The first cage 50 is inserted in the axial direction of the first inner ring 20 from the second side end face side where the first through groove 29 is formed. The first rolling element 40 is fitted into the first pocket 51 of the first cage 50. In this way, a subassembly including the first cage 50, the first rolling element 40, and the first inner ring 20 is made.

  The second inner ring 30 is arranged so that the second large-diameter side end face 34 faces downward and the second small-diameter side end face 32 faces upward. The plurality of second rolling elements 45 are placed on the second large diameter side end face 34, and the rolling surfaces of the second rolling elements 45 are brought into contact with the second inner ring raceway surface 33. The plurality of second rolling elements 45 are arranged at equal intervals in the circumferential direction of the second inner ring 30. The second cage 60 is inserted in the axial direction of the second inner ring 30 from the first side end face side where the second through groove 39 is formed. The second rolling element 45 is fitted into the second pocket 61 of the second cage 60. In this way, a subassembly including the second cage 60, the second rolling element 45, and the second inner ring 30 is made.

  A subassembly composed of the first cage 50, the first rolling element 40, and the first inner ring 20 is inserted into the outer ring 11 from the first fitting surface 14 side in the axial direction of the outer ring 11. A subassembly composed of the second cage 60, the second rolling element 45, and the second inner ring 30 is inserted into the outer ring 11 from the second fitting surface 16 side in the axial direction of the outer ring 11.

  The retaining ring 80 is inserted into the first shaft cylindrical surface 26 of the first inner ring 20, and the retaining ring 80 is moved along the first shaft cylindrical surface 26 toward the second inner ring 30. When the retaining ring 80 reaches a position straddling the first inner ring 20 and the second inner ring 30, the diameter increases in the outer diameter direction, and the first flange 82 is inserted into the first engagement groove 27, and the second engagement The second flange 83 is inserted into the mating groove 37, and the outer periphery of the band portion 81 is in surface contact with the first storage surface 28 and the second storage surface 38. Thus, the first inner ring 20 and the second inner ring 30 are connected (FIG. 1).

  Grease is supplied from one end of the outer ring 11 to the first outer ring raceway surface 13 and the first inner ring raceway surface 23, and grease is supplied from the other end of the outer ring 11 to the second outer ring raceway surface 15 and the second inner ring raceway surface 33. Be greasy.

  At the same time that the outer periphery of the first oil seal 90 is press-fitted to the first fitting surface 14, the inner periphery of the first oil seal 90 is in sliding contact with the first sliding surface 25 of the first inner ring 20. The outer periphery of the second oil seal 95 is press-fitted and fitted to the second fitting surface 16, and at the same time, the inner periphery of the second oil seal 95 is in sliding contact with the second sliding surface 35 of the second inner ring 30.

  As shown in FIG. 1, the additional supply of grease is performed from one end of the first supply passage 71, and the grease is fed in the order of the first supply passage 71, the second supply passage 72, and the annular groove 73. Further, the grease is sent to the through passage through any one of the notch 85 and the through holes 86, 87, 88, the grease is sent between the first outer ring raceway surface 13 and the first inner ring raceway surface 23, and the second outer ring. Grease is sent between the raceway surface 15 and the second inner ring raceway surface 33.

  The first inner ring 20 and the second inner ring 30 can be connected via the retaining ring 80, and the grease of the first supply passage 71 and the second supply passage 72 of the support shaft 70 can be connected to the first outer ring raceway surface 13 and the retaining ring 80 via the retaining ring 80. Since it can be sent between the first inner ring raceway surface 23 and between the second outer ring raceway surface 15 and the second inner ring raceway surface 33, the number of parts can be reduced.

  When the retaining ring 80 is elastically restored in the outer diameter direction, the first flange 82 is inserted into the first engagement groove 27, the second flange 83 is inserted into the second engagement groove 37, and the first storage is performed. Since the outer periphery of the band portion 81 is in surface contact with the surface 28 and the second storage surface 38, the first inner ring 20 and the second inner ring 30 can be more reliably connected.

  The circumferential widths of the notch 85, the first through-groove 29 and the second through-groove 39, and the through-holes 86, 87, 88 are the same as the notch 85, the first through-groove 29, the second through-groove 39, and the through-hole 86. , 87, 88, and the notch 85 communicates with the first through-groove 29 and the second through-groove 39 according to the circumferential position of the notch 85, and the first through-groove 29 and the second through-hole 29. In some cases, the through holes 86, 87, 88 do not communicate with the through groove 39, and there are a plurality of through holes 86, 87, 88 at any position in the circumferential direction where the notch 85 does not communicate with the first through groove 29 and the second through groove 39. Since the circumferential direction is formed at unequal intervals so as to communicate with at least one of the first through-groove 29 and the second through-groove 39, the inner circumference from the inner circumference of the first inner ring 20 and the second inner ring 30 to the outer circumference is formed. Grease can be supplied more reliably.

  The present invention is not limited to these embodiments, and can of course be implemented in various modes without departing from the gist of the present invention.

  In the embodiment described above, the first through groove 29 having a semicircular cross section is formed in the second side end surface so as to penetrate in the radial direction, and the second through groove 39 having a semicircular cross section is formed in the first side end surface in the radial direction. A through passage having a circular cross section was formed by penetrating the first through groove 29 and the second through groove 39. As another embodiment, only the first through groove 29 may be formed, or conversely, only the second through groove 39 may be formed.

11: outer ring, 13: first outer ring raceway surface, 15: second outer ring raceway surface, 20: first inner ring, 23: first inner ring raceway surface, 27: first engagement groove (engagement groove), 28: first 1 storage surface (storage surface), 29: first through groove (through groove), 30: second inner ring, 33: second inner ring raceway surface, 37: second engagement groove (engagement groove), 38: second Storage surface (storage surface), 39: second through groove (through groove), 40: first rolling element, 45: first rolling element, 80: retaining ring, 81: belt part, 82: first collar part (鍔Part), 83: second collar part (collar part), 85: notch, 86: through hole, 87: through hole, 88: through hole

Claims (3)

An outer ring formed by shifting the first outer ring raceway surface and the second outer ring raceway surface in the axial direction on the inner circumference, and disposed corresponding to the first outer ring raceway surface on the inner circumference side of the outer ring, and the first inner ring on the outer circumference A first inner ring having a raceway surface, a second inner ring having a second inner ring raceway surface formed on an outer periphery thereof, the second inner ring being disposed corresponding to the second outer ring raceway surface on the inner circumference side of the outer ring, and the first outer ring raceway surface; A first rolling element that rolls above and on the first inner ring raceway surface, a second rolling element that rolls on the second outer ring raceway surface and the second inner ring raceway surface, the first inner ring and the A ring-shaped retaining ring disposed in contact with the inner circumference at a position straddling the second inner ring, the second inner end side second end surface of the first inner ring, and the second inner ring With the first inner ring side and the first inner end side being in contact with each other, the first inner ring and the first In the double row rolling bearing formed by connecting the inner ring,
At least one of the second side end surface and the first side end surface is formed with through grooves that penetrate in the radial direction at equal intervals in the circumferential direction,
The retaining ring has an elastic function of reducing the diameter in the inner diameter direction and elastically returning in the outer diameter direction, forming a notch at one circumferential position, and spacing the through holes penetrating in the radial direction in the circumferential direction. A double row rolling bearing characterized in that a plurality of them are formed with a gap between them. The retaining ring is composed of a cylindrical belt portion and a pair of flange portions protruding in the outer diameter direction from both sides in the axial direction of the belt portion,
On the inner periphery of the first inner ring and the second inner ring, a storage surface for storing the band portion is formed, and a pair of engagement grooves for storing the pair of flange portions are formed,
When the snap ring is inserted into the inner circumference of the first inner ring or the second inner ring, the retaining ring is reduced in diameter in the inner diameter direction, and when the pair of flanges correspond to the pair of engaging grooves, the retaining ring The double-row rolling bearing according to claim 1, wherein the outer ring is elastically restored in the outer diameter direction. The circumferential width decreases in the order of the notch, the through groove, and the through hole,
Depending on the circumferential position of the notch, the notch may communicate with the through groove and may not communicate with the through groove.
The through holes are unequally spaced in the circumferential direction so as to communicate with at least one of the plurality of through grooves at any position in the circumferential direction where the notch does not communicate with the through groove. The double row rolling bearing according to claim 1, wherein the double row rolling bearing is formed.

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