JP2022052173A - bearing - Google Patents

Abstract

To provide a bearing in which non-contact type sealing structure having high sealing performance can be materialized with simple constitution while suppressing the degradation of strength.SOLUTION: A bearing 10 comprises: a first inner ring 1 having a raceway surface 11 and an end face 13 on the first side in an axial direction A; a first outer ring 3 having a raceway surface 31 and an end face 33 on the first side; a plurality of first cylindrical rollers 5 arranged between the raceway surface 11 of the first inner ring 1 and the raceway surface 31 of the first outer ring 3; and a first seal 7 mounted to the first outer ring 3 and covering a clearance between the first inner ring 1 and the first outer ring 3 from the first side. The end face 13 of the first inner ring 1 is located on the first side with respect to the end face 33 of the first outer ring 3. A first groove 14 annularly extending in the axial direction A as the depth direction is formed in the end face 13 of the first inner ring 1. The first seal 7 has a first cylindrical portion 71 arranged in the first groove 14 so that a plurality of axial labyrinths AL1, AL2 are formed.SELECTED DRAWING: Figure 2

Description

The present invention relates to a bearing having a non-contact type sealed structure.

Patent Document 1 describes a bearing including an inner ring, an outer ring, a plurality of tapered rollers, and a sealing member fixed to the outer ring, and the sealing member is formed in a circumferential groove formed on one end surface of the inner ring. A bearing in which the tip of the bearing is arranged is described (see FIGS. 9 and 10 of Patent Document 1).

Japanese Unexamined Patent Publication No. 2011-220428

In the bearing described in Patent Document 1, the distance between the raceway surface in the inner ring and one end face is smaller than the distance between the raceway surface in the outer ring and one end face, and then in the inner ring. A circumferential groove is formed on one end face. Therefore, in the bearing described in Patent Document 1, the strength of the inner ring may decrease.

Therefore, an object of the present invention is to provide a bearing capable of realizing a non-contact type sealing structure having high sealing performance with a simple configuration while suppressing a decrease in strength.

The bearing of the present invention has a first inner ring having a raceway surface and an end surface on one side in the axial direction, a first outer ring having a raceway surface and an end surface on one side, and a raceway surface and a first inner ring of the first inner ring. It is provided with a plurality of first rollers arranged between the raceway surface of the outer ring and a first seal attached to the first outer ring and covering the gap between the first inner ring and the first outer ring from one side. The end face of the first inner ring is located on one side of the end face of the first outer ring, and the end face of the first inner ring has a first groove extending in an annular shape with the axial direction as the depth direction. Formed, the first seal has a cylindrical portion arranged in the first groove such that a plurality of axial labyrinths are formed.

In this bearing, a plurality of axial labyrinths are formed by arranging the cylindrical portion of the first seal attached to the first outer ring in the first groove formed on the end face of the first inner ring. This makes it possible to realize a non-contact type sealing structure having high sealing performance without using parts other than bearing components. Further, the end face of the first inner ring in which the first groove is formed is located on one side in the axial direction with respect to the end face of the first outer ring. That is, the distance between the raceway surface and the end surface in the first inner ring is larger than the distance between the raceway surface and the end surface in the first outer ring. As a result, it is possible to suppress a decrease in the strength of the first inner ring due to the formation of the first groove. As described above, according to this bearing, a non-contact type sealing structure having high sealing performance can be realized with a simple configuration while suppressing a decrease in strength.

In the bearing of the present invention, the end face of the first inner ring has a first region located on the inner side in the radial direction with respect to the first groove and a second region located on the outer side in the radial direction with respect to the first groove. Including, the second region is located on the other side in the axial direction with respect to the first region, and the first seal further has a bottom wall portion extending outward from the cylindrical portion, in the bottom wall portion. The surface on the other side may be located on one side with respect to the second region and may be located on the other side with respect to the first region. According to this, it is possible to suppress the increase in the size of the occupied space due to the bearing while simplifying the shape of the first seal.

In the bearing of the present invention, the first inner ring has a flange portion provided on one side with respect to the raceway surface of the first inner ring, and the first groove may be formed in the flange portion. According to this, it is possible to more reliably suppress the decrease in the strength of the first inner ring due to the formation of the first groove.

In the bearing of the present invention, the portion of the first inner ring in which the first groove is formed is located on the inner side in the radial direction with respect to the first groove and on the outer side in the radial direction with respect to the first groove. The thickness of the first portion in the radial direction, including the second portion located, may be larger than the thickness of the second portion in the radial direction. According to this, it is possible to more reliably suppress the decrease in the strength of the first inner ring due to the formation of the first groove.

The bearing of the present invention is arranged on the other side in the axial direction with respect to the first inner ring, and is arranged on the other side with respect to the raceway plane and the second inner ring having the end face on the other side and the first outer ring. A second outer ring having a raceway surface and an end face on the other side, a plurality of second rollers arranged between the raceway surface of the second inner ring and the raceway surface of the second outer ring, and attached to the second outer ring. A second seal that covers the gap between the second inner ring and the second outer ring from the other side is further provided, and the end face of the second inner ring is located on the other side with respect to the end face of the second outer ring. A second groove extending in an annular shape with the axial direction as the depth direction is formed on the end face of the second inner ring, and the second seal has a second seal so that a plurality of axial labyrinths are formed. It may have a cylindrical portion arranged in the groove. According to this, in a double row roller bearing, a non-contact type sealing structure having high sealing performance can be realized with a simple configuration while suppressing a decrease in strength.

According to the present invention, it is possible to provide a bearing capable of realizing a non-contact type sealing structure having high sealing performance with a simple configuration while suppressing a decrease in strength.

It is sectional drawing of the bearing of one Embodiment. It is sectional drawing of a part of the bearing shown in FIG. It is sectional drawing of a part of the bearing of a modification. It is sectional drawing of a part of the bearing of a modification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same or corresponding parts are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIG. 1, the bearing 10 includes a first inner ring 1, a second inner ring 2, a first outer ring 3, a second outer ring 4, and a plurality of first cylindrical rollers (first rollers) 5. A plurality of second cylindrical rollers (second rollers) 6, a first seal 7, a second seal 8, a first cage 9A, and a second cage 9B are provided. The bearing 10 is a double-row cylindrical roller bearing, and is used, for example, for an axle of a railway vehicle.

The first inner ring 1 is arranged on the first side (one side) in the axial direction A with respect to the second inner ring 2. In other words, the second inner ring 2 is arranged on the second side (the other side) in the axial direction A with respect to the first inner ring 1. The second side in the axial direction A is opposite to the first side in the axial direction A. The first inner ring 1 is formed separately from the second inner ring 2 and is in contact with the second inner ring 2. The first inner ring 1 has a raceway surface 11, an inner diameter surface 12, and an end surface 13. The end face 13 is the end face on the first side in the axial direction A. The second inner ring 2 has a raceway surface 21, an inner diameter surface 22, and an end surface 23. The end face 23 is the end face on the second side in the axial direction A. The inner diameter surface 12 and the inner diameter surface 22 are fitted to a shaft (not shown).

The first outer ring 3 is arranged outside the first inner ring 1 in the radial direction R. The second outer ring 4 is arranged outside the second inner ring 2 in the radial direction R. That is, the first outer ring 3 is arranged on the first side in the axial direction A with respect to the second outer ring 4. In other words, the second outer ring 4 is arranged on the second side in the axial direction A with respect to the first outer ring 3. The first outer ring 3 is formed separately from the second outer ring 4, and is in contact with the second outer ring 4. The first outer ring 3 has a raceway surface 31, an outer diameter surface 32, and an end surface 33. The end face 33 is the end face on the first side in the axial direction A. The second outer ring 4 has a raceway surface 41, an outer diameter surface 42, and an end surface 43. The end face 43 is the end face on the second side in the axial direction A. The outer diameter surface 32 and the outer diameter surface 42 are fitted with a housing (not shown).

The plurality of first cylindrical rollers 5 are arranged between the raceway surface 11 of the first inner ring 1 and the raceway surface 31 of the first outer ring 3. The plurality of first cylindrical rollers 5 are held by the first cage 9A so as to be rotatable between the raceway surface 11 and the raceway surface 31 at regular intervals. The plurality of second cylindrical rollers 6 are arranged between the raceway surface 21 of the second inner ring 2 and the raceway surface 41 of the second outer ring 4. The plurality of second cylindrical rollers 6 are held by the second cage 9B so as to be rotatable between the raceway surface 21 and the raceway surface 41 at regular intervals.

The end surface 13 of the first inner ring 1 is formed with a first groove 14 having the axial direction A as the depth direction. The first groove 14 extends in an annular shape about the center line of the first inner ring 1 when viewed from the first side. The first groove 14 is open on the first side in the axial direction A in the end surface 13. A second groove 24 having the axial direction A as the depth direction is formed on the end surface 23 of the second inner ring 2. The second groove 24 extends in an annular shape about the center line of the second inner ring 2 when viewed from the second side. The second groove 24 opens on the end surface 23 on the second side in the axial direction A. The end surface 13 of the first inner ring 1 is located on the first side in the axial direction A with respect to the end surface 33 of the first outer ring 3. The end surface 23 of the second inner ring 2 is located on the second side in the axial direction A with respect to the end surface 43 of the second outer ring 4.

The first seal 7 is attached to the first outer ring 3 and covers the gap between the first inner ring 1 and the first outer ring 3 from the first side in the axial direction A. The first seal 7 has a first cylindrical portion (cylindrical portion) 71. The first cylindrical portion 71 is arranged in the first groove 14 so that a plurality of axial labyrinths are formed. The second seal 8 is attached to the second outer ring 4 and covers the gap between the second inner ring 2 and the second outer ring 4 from the second side in the axial direction A. The second seal 8 has a first cylindrical portion (cylindrical portion) 81. The first cylindrical portion 81 is arranged in the second groove 24 so that a plurality of axial labyrinths are formed.

The configuration relating to the first seal 7 will be described in more detail. In this embodiment, a portion composed of a first inner ring 1, a first outer ring 3, a plurality of first cylindrical rollers 5, a first seal 7, and a first cage 9A (hereinafter, "by the first inner ring 1 and the like"). A portion composed of a second inner ring 2, a second outer ring 4, a plurality of second cylindrical rollers 6, a second seal 8 and a second cage 9B (hereinafter referred to as "second inner ring 2"). (Refered to as a portion composed of the above) has a plane-symmetrical relationship with respect to the plane perpendicular to the center line of the bearing 10 (the interface between the first inner ring 1 and the second inner ring 2). A more detailed description of the configuration will be omitted.

As shown in FIG. 2, the first inner ring 1 has a collar portion 15. The flange portion 15 is provided on the first side in the axial direction A with respect to the raceway surface 11. The end surface on the first side of the flange portion 15 is the end surface 13 of the first inner ring 1. That is, the first groove 14 is formed in the flange portion 15. A flange portion is not provided on the second side in the axial direction A with respect to the raceway surface 11.

The flange portion 15 which is a portion of the first inner ring 1 in which the first groove 14 is formed includes the first portion 16 and the second portion 17. The first portion 16 is a portion located inside the first groove 14 in the radial direction R. The second portion 17 is a portion located outside the first groove 14 in the radial direction R. The thickness of the first portion 16 in the radial direction R is larger than the thickness of the second portion 17 in the radial direction R. The end face 13 of the first inner ring 1 includes a first region 13a and a second region 13b. The first region 13a is a region located inside in the radial direction R with respect to the first groove 14, and is an end face on the first side of the first portion 16. The second region 13b is a region located outside in the radial direction R with respect to the first groove 14, and is an end face on the first side of the second portion 17. The second region 13b is located on the second side in the axial direction A with respect to the first region 13a.

The first outer ring 3 has an inner peripheral surface 34. The inner peripheral surface 34 is formed on the first side in the axial direction A with respect to the raceway surface 31. The inner peripheral surface 34 is a cylindrical surface having the same center line as the raceway surface 31, and intersects the end surface 33. A flange portion 35 is provided on the second side in the axial direction A with respect to the raceway surface 31.

In addition to the first cylindrical portion 71, the first seal 7 includes a second cylindrical portion 72, a third cylindrical portion 73, a first bottom wall portion (bottom wall portion) 74, and a second bottom wall portion 75. Have. The third cylindrical portion 73 is located outside in the radial direction R with respect to the first cylindrical portion 71, and the second cylindrical portion 72 is located outside in the radial direction R with respect to the third cylindrical portion 73. There is. The first cylindrical portion 71, the second cylindrical portion 72, and the third cylindrical portion 73 have the same center line as the first outer ring 3. The second bottom wall portion 75 is located on the second side in the axial direction A with respect to the first bottom wall portion 74. In the first seal 7, the first bottom wall portion 74 is a portion located on the first side in the axial direction A.

The first bottom wall portion 74 extends from the first-side end of the first cylindrical portion 71 to the first-side end of the third cylindrical portion 73. That is, the first bottom wall portion 74 extends outward in the radial direction R from the first cylindrical portion 71. The second bottom wall portion 75 extends from the second end of the third cylinder 73 to the first end of the second cylinder 72. The first seal 7 is integrally formed of, for example, a metal material.

The first seal 7 is attached to the first outer ring 3 by press-fitting the second cylindrical portion 72 into the inner peripheral surface 34 of the first outer ring 3. With the first seal 7 attached to the first outer ring 3, the surface 74a on the second side of the first bottom wall portion 74 is located on the first side in the axial direction A with respect to the second region 13b of the end face 13. And it is located on the second side in the axial direction A with respect to the first region 13a of the end face 13. In the present embodiment, the surface 74b on the first side of the first bottom wall portion 74 is located on the same plane as the first region 13a of the end surface 13. That is, the first seal 7 does not have a portion protruding to the first side in the axial direction A with respect to the first region 13a of the end surface 13.

With the first seal 7 attached to the first outer ring 3, the first cylindrical portion 71 is arranged in the first groove 14 through the opening of the first groove 14. As a result, the axial labyrinth AL1 is formed between the first cylindrical portion 71 and the first portion 16, and the axial labyrinth AL2 is formed between the first cylindrical portion 71 and the second portion 17. .. Further, a radial labyrinth RL1 is formed between the first cylindrical portion 71 and the bottom surface of the first groove 14, and a radial labyrinth RL2 is formed between the first bottom wall portion 74 and the second portion 17. ing.

As described above, in the bearing 10, the first cylindrical portion 71 of the first seal 7 attached to the first outer ring 3 is arranged in the first groove 14 formed in the end surface 13 of the first inner ring 1. As a result, a plurality of axial labyrinths AL1 and AL2 are formed. Similarly, the first cylindrical portion 81 of the second seal 8 attached to the second outer ring 4 is arranged in the second groove 24 formed in the end surface 23 of the second inner ring 2, whereby a plurality of axial directions are provided. A labyrinth is formed. As a result, it is possible to realize a non-contact type sealing structure having high sealing performance (that is, performance of suppressing leakage of lubricant and intrusion of foreign matter) without using parts other than the components of the bearing 10. can. The bearing 10 is also highly sealed against fretting wear debris generated by contact of parts other than the components of the bearing 10 (front lid, rear lid, etc.) with the first region 13a of the end face 13 or the first region of the end face 23. It can demonstrate its performance. Further, the end surface 13 of the first inner ring 1 in which the first groove 14 is formed is located on the first side in the axial direction A with respect to the end surface 33 of the first outer ring 3. That is, the distance between the raceway surface 11 and the end surface 13 in the first inner ring 1 is larger than the distance between the raceway surface 31 and the end surface 33 in the first outer ring 3. As a result, it is possible to suppress a decrease in the strength of the first inner ring 1 due to the formation of the first groove 14. Similarly, the end surface 23 of the second inner ring 2 in which the second groove 24 is formed is located on the second side in the axial direction A with respect to the end surface 43 of the second outer ring 4. That is, the distance between the raceway surface 21 and the end surface 23 in the second inner ring 2 is larger than the distance between the raceway surface 41 and the end surface 43 in the second outer ring 4. As a result, it is possible to suppress a decrease in the strength of the second inner ring 2 due to the formation of the second groove 24. As described above, according to the bearing 10, it is possible to realize a non-contact type sealing structure having high sealing performance in a double-row cylindrical roller bearing with a simple configuration while suppressing a decrease in strength.

Further, in the bearing 10, in the end surface 13 of the first inner ring 1, the second region 13b is located on the second side in the axial direction A with respect to the first region 13a, and the surface 74a of the first bottom wall portion 74 is located. , It is located on the first side in the axial direction A with respect to the second region 13b, and is located on the second side in the axial direction A with respect to the first region 13a. As a result, it is possible to suppress the increase in the size of the occupied space due to the bearing 10 while simplifying the shape of the first seal 7. In particular, in the bearing 10, since the first seal 7 does not have a portion protruding to the first side in the axial direction A with respect to the first region 13a, the enlargement of the occupied space by the bearing 10 is more reliably suppressed. be able to. The portion composed of the second inner ring 2 and the like also has the same effect as the portion composed of the first inner ring 1 and the like.

Further, in the bearing 10, the first groove 14 is formed in the flange portion 15 of the first inner ring 1. As a result, it is possible to more reliably suppress the decrease in the strength of the first inner ring 1 due to the formation of the first groove 14. The portion composed of the second inner ring 2 and the like also has the same effect as the portion composed of the first inner ring 1 and the like.

Further, in the bearing 10, the thickness of the first portion 16 in the radial direction R is larger than the thickness of the second portion 17 in the radial direction R in the portion of the first inner ring 1 in which the first groove 14 is formed. As a result, it is possible to more reliably suppress the decrease in the strength of the first inner ring 1 due to the formation of the first groove 14. The portion composed of the second inner ring 2 and the like also has the same effect as the portion composed of the first inner ring 1 and the like.

Further, in the bearing 10, the first inner ring 1 is formed separately from the second inner ring 2, and the first outer ring 3 is formed separately from the second outer ring 4. As a result, the first seal 7 can be easily removed from the first outer ring 3 as follows. That is, the first outer ring is pressed along the axial direction A by pressing the end surface of the first inner ring 1 opposite to the end surface 13 in a state where the portion composed of the first inner ring 1 and the like is removed from the shaft and the housing. The second cylindrical portion 72 of the first seal 7 is removed from the inner peripheral surface 34 of 3.

The present invention is not limited to the embodiments described above. For example, as shown in FIG. 3, the first seal 7 may further have a fourth cylindrical portion 76. The fourth cylindrical portion 76 is arranged so as to surround the portion of the first inner ring 1 in which the first groove 14 is formed. As a result, the axial labyrinth AL3 is further formed between the fourth cylindrical portion 76 and the portion of the first inner ring 1. According to the example shown in FIG. 3, a non-contact type sealing structure having higher sealing performance can be realized. As an example, in the example shown in FIG. 3, the third bottom wall portion 77 extends outward in the radial direction R from the end on the first side of the fourth cylindrical portion 76, and the third bottom wall portion 77. A cylindrical portion provided at the outer end portion is press-fitted into the inside of the third cylindrical portion 73 of the first seal 7. The second seal 8 may further have a similar fourth cylindrical portion.

Further, as shown in FIG. 4, the first seal 7 may further have an elastic member 78. The elastic member 78 is provided in the first cylindrical portion 71, and is arranged in the first groove 14 together with the first cylindrical portion 71. At least one groove extending in an annular shape is formed on each of the second side surface, the inner surface, and the outer surface of the elastic member 78. According to the example shown in FIG. 4, higher sealing performance can be obtained in each of the radial labyrinth RL1, the axial labyrinth AL1 and the axial labyrinth AL2. As an example, the elastic member 78 can have an arbitrary shape by molding using an elastic material such as rubber. The second seal 8 may further have a similar elastic member.

Further, a plurality of first grooves 14 are formed on the end surface 13 of the first inner ring 1, the first seal 7 has a plurality of cylindrical portions, and the first seal 7 is formed in each of the first grooves 14. Each cylindrical portion may be arranged. Further, a plurality of second grooves 24 are formed on the end surface 23 of the second inner ring 2, the second seal 8 has a plurality of cylindrical portions, and the second seal 8 is formed in each of the second grooves 24. Each cylindrical portion may be arranged.

Further, an inner ring spacer may be arranged between the first inner ring 1 and the second inner ring 2. Further, an outer ring spacer may be arranged between the first outer ring 3 and the second outer ring 4. Further, the first inner ring 1 and the second inner ring 2 may be integrally formed. Further, the first outer ring 3 and the second outer ring 4 may be integrally formed.

Further, the bearing 10 may be a single row roller bearing including a portion composed of a first inner ring 1 or the like or a portion composed of a second inner ring 2 or the like. When the bearing 10 is a single row roller bearing including a portion composed of the first inner ring 1 and the like, the configuration relating to the first seal 7 may be provided on the second side portion of the bearing 10. When the bearing 10 is a single row roller bearing including a portion composed of the second inner ring 2 and the like, the configuration relating to the second seal 8 may be provided on the first side portion of the bearing 10.

Further, the bearing 10 may be provided with a plurality of first tapered rollers instead of the plurality of first cylindrical rollers 5. Further, the bearing 10 may be provided with a plurality of second tapered rollers instead of the plurality of second cylindrical rollers 6.

Further, the surface 74b on the first side of the first bottom wall portion 74 may be located on the first side with respect to the first region 13a of the end surface 13, or may be located on the first side with respect to the first region 13a of the end surface 13. It may be located on the second side. The same applies to the configuration relating to the second seal 8.

Further, in the bearing 10, the portion composed of the first inner ring 1 or the like may be arranged on the shaft end side with respect to the portion composed of the second inner ring 2 or the like, or may be arranged by the second inner ring 2 or the like. The configured portion may be arranged on the shaft end side with respect to the portion composed of the first inner ring 1 and the like. Further, another labyrinth may be formed by using a component other than the component component of the bearing 10.

1 ... 1st inner ring, 2 ... 2nd inner ring, 3 ... 1st outer ring, 4 ... 2nd outer ring, 5 ... 1st cylindrical roller (1st roller), 6 ... 2nd cylindrical roller (2nd roller), 7 ... 1st seal, 8 ... 2nd seal, 10 ... Bearing, 11,21,31,41 ... Track surface, 13,23,33,43 ... End face, 13a ... 1st region, 13b ... 2nd region, 14 ... 1 groove, 15 ... bearing part, 16 ... first part, 17 ... second part, 24 ... second groove, 71, 81 ... first cylindrical part (cylindrical part), 74 ... first bottom wall part (bottom wall part) ), 74a ... surface, A ... axial direction, AL1, AL2 ... axial labyrinth, R ... radial direction.

Claims (5)

A first inner ring having a raceway surface and an end face on one side in the axial direction,
The raceway surface and the first outer ring having the end surface on one side thereof,
A plurality of first rollers arranged between the raceway surface of the first inner ring and the raceway surface of the first outer ring, and
A first seal attached to the first outer ring and covering the gap between the first inner ring and the first outer ring from one side thereof.
The end face of the first inner ring is located on one side of the end face of the first outer ring.
A first groove extending in an annular shape with the axial direction as the depth direction is formed on the end surface of the first inner ring.
The first seal is a bearing having a cylindrical portion arranged in the first groove so that a plurality of axial labyrinths are formed. The end face of the first inner ring includes a first region located inside the first groove in the radial direction and a second region located outside the first groove in the radial direction. ,
The second region is located on the other side of the first region in the axial direction.
The first seal further has a bottom wall portion extending outward from the cylindrical portion.
Claim 1 that the surface on the other side of the bottom wall portion is located on the one side with respect to the second region and is located on the other side with respect to the first region. Bearings described in. The first inner ring has a flange portion provided on one side of the raceway surface of the first inner ring.
The bearing according to claim 1 or 2, wherein the first groove is formed in the flange portion. The portion of the first inner ring in which the first groove is formed is located on the inner side in the radial direction with respect to the first groove and on the outer side in the radial direction with respect to the first groove. Including the second part to
The bearing according to any one of claims 1 to 3, wherein the thickness of the first portion in the radial direction is larger than the thickness of the second portion in the radial direction. A second inner ring arranged on the other side in the axial direction with respect to the first inner ring and having a raceway surface and an end surface on the other side.
A second outer ring arranged on the other side of the first outer ring and having a raceway surface and an end surface on the other side.
A plurality of second rollers arranged between the raceway surface of the second inner ring and the raceway surface of the second outer ring, and
Further provided with a second seal attached to the second outer ring and covering the gap between the second inner ring and the second outer ring from the other side.
The end face of the second inner ring is located on the other side of the end face of the second outer ring.
A second groove extending in an annular shape with the axial direction as the depth direction is formed on the end surface of the second inner ring.
The bearing according to any one of claims 1 to 4, wherein the second seal has a cylindrical portion arranged in the second groove so that a plurality of axial labyrinths are formed.

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