JP2020020401A - Rolling bearing device - Google Patents

Abstract

To improve the assemblability of a rolling bearing having a radial bearing part and a thrust bearing part, on an assembly object.SOLUTION: A rolling bearing device 1 includes a radial bearing part 2, and a thrust bearing part 3, the radial bearing part 2 including an outer ring 21, an inner ring 22, and a plurality of cylindrical rollers 23 being concentrically arranged side by side in the radial direction, the thrust bearing part 3 including a plurality of needle rollers 33, and a first race 31 having a raceway surface 311a where the needle rollers 33 roll, and being arranged side by side with the inner ring 22 in the axial direction, the inner ring 22 having a flange part 221 on one axial side, protruded from the raceway surface 22a where the cylindrical rollers 23 roll, in the radial direction for restricting the axial movement of the cylindrical rollers 23. The movement of the cylindrical rollers 23 to the other axial side relative to the inner ring 22 is restricted by the abutment on the first race 31.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rolling bearing device having a radial bearing portion and a thrust bearing portion.

  2. Description of the Related Art Conventionally, for example, there is a rolling bearing device that supports a rotating member in a transmission of an automobile and has a radial bearing portion and a thrust bearing portion (see, for example, Patent Document 1).

  The rolling bearing (radial thrust roller bearing) described in Patent Literature 1 has a cylindrical roller bearing as a radial bearing portion that receives a radial load, and a needle bearing as a thrust bearing portion that receives a thrust load. The cylindrical roller bearing has an outer ring having flanges at both ends, an inner ring concentrically arranged inside the outer ring, and a plurality of cylindrical rollers arranged between the outer ring and the inner ring. The needle bearing has a plurality of needle rollers arranged on one end side of the outer ring of the cylindrical roller bearing, and a retainer for holding the plurality of needle rollers. Further, the retainer of the needle bearing has a cylindrical extension along the inner ring of the cylindrical roller bearing, and a flange extending radially outward from the axially inner end of the cylindrical extension. A radially outer end of the flange portion is fitted with an inwardly protruding portion provided on a flange portion of the outer ring. By this fitting, the retainer of the needle bearing and the outer ring of the cylindrical roller bearing are connected.

JP 2008-232240 A

  In the rolling bearing described in Patent Literature 1, axial movement of the cylindrical roller relative to the inner ring of the cylindrical roller bearing is not restricted. For this reason, for example, when assembling to a mounting object such as a transmission of an automobile, the outer ring and the plurality of cylindrical rollers of the cylindrical roller bearing to which the retainer of the needle bearing is coupled, and the inner ring of the cylindrical roller bearing are axially aligned. Relative movement may cause difficulty in assembling work.

  Therefore, an object of the present invention is to improve the assemblability of a rolling bearing having a radial bearing portion and a thrust bearing portion to an assembly target.

  The present invention, in order to achieve the above object, is a rolling bearing device having a radial bearing portion and a thrust bearing portion, wherein the radial bearing portion includes a pair of radial race rings which are concentrically arranged side by side in the radial direction. A plurality of radial rolling elements disposed between the pair of radial races, the thrust bearing portion includes a pair of thrust races arranged side by side in the axial direction, and a pair of the thrust races. A plurality of thrust rolling elements disposed therebetween, wherein the thrust bearing portion is disposed axially in line with one of the pair of radial bearing rings in the axial direction, and the one radial bearing ring Has a flange portion on one axial side that protrudes radially from the raceway surface on which the radial rolling element rolls to restrict axial movement of the radial rolling element, and is provided on the one radial raceway ring. The movement in the other axial direction of the radial rolling element is restricted by the abutment of the one of the thrust bearing ring of the pair of thrust bearing ring, to provide a rolling bearing device.

  ADVANTAGE OF THE INVENTION According to this invention, in the rolling bearing which has a radial bearing part and a thrust bearing part, it becomes possible to improve the assemblability to an installation object.

It is a sectional view showing an example of the state where the rolling bearing concerning a 1st embodiment of the present invention was attached to an attachment object. It is sectional drawing which expands and shows a part of rolling bearing. It is a perspective sectional view showing the last process at the time of assembling a rolling bearing. It is sectional drawing which shows the rolling bearing which concerns on the modification 1. FIG. 13 is a cross-sectional view illustrating a rolling bearing according to Modification 2. It is a sectional view showing an example of the state where the rolling bearing concerning a 2nd embodiment of the present invention was attached to an attachment object. It is sectional drawing which expands and shows a part of rolling bearing which concerns on 2nd Embodiment.

[First Embodiment]
A first embodiment of the present invention will be described with reference to FIGS. The embodiments described below are shown as preferred specific examples for carrying out the present invention, and there are portions specifically illustrating various technical matters that are technically preferable. However, the technical scope of the present invention is not limited to this specific embodiment.

  FIG. 1 is a cross-sectional view illustrating an example of a state where the rolling bearing according to the first embodiment of the present invention is assembled to an assembly target. FIG. 2 is an enlarged cross-sectional view showing a part of the rolling bearing. FIG. 3 is a perspective sectional view showing the final step in assembling the rolling bearing.

  The assembly target 4 shown in FIG. 1 is, for example, a transmission of an automobile, and has a housing 41 as a non-rotating fixed member and a shaft 42 as a rotating member. The shaft 42 has a large diameter part 421 and a small diameter part 422, and a step surface 42 a is formed between the large diameter part 421 and the small diameter part 422. The rolling bearing 1 is housed in a concave portion 410 formed in the housing 41 and supports the shaft 42 rotatably with respect to the housing 41.

  The rolling bearing 1 has a radial bearing 2 that receives a radial radial load, and a thrust bearing 3 that receives an axial thrust load. The radial bearing portion 2 includes an outer ring 21 and an inner ring 22 as a pair of radial race rings arranged concentrically in a radial direction, and a plurality of cylindrical rollers as a plurality of radial rolling elements disposed between the outer ring 21 and the inner ring 22. 23, and a retainer 24 that rotatably holds the plurality of cylindrical rollers 23, and is configured as a cylindrical roller bearing. The outer ring 21 is fitted in the recess 410 of the housing 41. The inner ring 22 is externally fitted to the small diameter portion 422 of the shaft 42, and is in contact with the step surface 42a.

  As shown in FIG. 2, the outer race 21 has first and second flanges 211 and 212 at both ends in the axial direction. The inner peripheral surface of the outer race 21 between the first flange portion 211 and the second flange portion 212 is a raceway surface 21a on which the plurality of cylindrical rollers 23 roll. The first and second flange portions 211 and 212 are formed in a ring shape protruding radially inward from the raceway surface 21a. The axial movement of the cylindrical roller 23 with respect to the outer ring 21 is regulated by the first and second flange portions 211 and 212.

  A raceway surface 22a on which the cylindrical rollers 23 roll is formed on the inner race 22 at a position radially facing the raceway surface 21a of the outer race 21. The inner race 22 has a flange portion 221 that protrudes radially from the raceway surface 22a and restricts axial movement of the cylindrical roller 23 on one axial side of the raceway surface 22a. The flange portion 221 protrudes radially outward from the raceway surface 22a, and regulates movement of the cylindrical roller 23 relative to the inner ring 22 to one axial side. In the present embodiment, the flange portion 221 of the inner ring 22 is formed at a position radially facing the first flange portion 211 of the outer ring 21, and a position radially facing the second flange portion 212 of the outer ring 21. Is not provided with a flange for restricting the axial movement of the cylindrical roller 23 with respect to the inner ring 22.

  The retainer 24 has an annular shape in which a plurality of accommodation holes 240 respectively accommodating the plurality of cylindrical rollers 23 are formed to penetrate in the radial direction, and are disposed between the outer ring 21 and the inner ring 22. The plurality of cylindrical rollers 23 are held by the holder 24 at equal intervals along the circumferential direction of the holder 24. The cylindrical roller 23 is formed to have a larger diameter than a needle roller 33 described later.

  The thrust bearing 3 includes first and second races 31 and 32, needle rollers 33 as a plurality of thrust rolling elements arranged between the first and second races 31 and 32, and a plurality of needles. And a retainer 34 that retains the roller 33, and is configured as a needle roller bearing. In the present embodiment, the thrust bearing 3 is arranged in the axial direction along with the inner ring 22 of the radial bearing 2. The first race 31 corresponds to the thrust race of the present invention, and rotates with the inner race 22 with respect to the second race 32.

  The first race 31 includes an annular plate-like orbital portion 311, an inner peripheral side peripheral wall 312 protruding from the inner end of the race 311 to the other side in the axial direction, and an outer end of the race 311. A cylindrical cylindrical portion 313 protruding from the portion toward the opposite side to the inner peripheral side peripheral wall portion 312 on one side in the axial direction, and a cylindrical portion 313 protruding radially outward from one axial end of the cylindrical portion 313. It has a flange part 314 integrally. Here, the radial length (height) of the flange portion 314 is substantially the same as the length (height) of the flange portion 221 projecting from the raceway surface 22a. The second race 32 integrally has an annular plate-shaped orbital portion 321 and an outer-diameter-side peripheral wall portion 322 protruding from the outer-diameter end of the orbital portion 321 to one side in the axial direction.

  The track portion 311 of the first race 31 has a track surface 311a on which the plurality of needle rollers 33 roll. A track surface 321a on which a plurality of needle rollers 33 rolls is formed in a track portion 321 of the second race 32 at a position facing the track surface 311a of the first race 31. The raceway portion 321 of the second race 32 has a surface opposite to the raceway surface 321a in contact with a bottom surface 410a (see FIG. 1) of the concave portion 410 of the housing 41. In the thrust bearing 3, the second race 32 may be omitted. In this case, the plurality of needle rollers 33 come into contact with the bottom surface 410a of the concave portion 410.

  The retainer 34 is arranged between the inner peripheral side wall 312 of the first race 31 and the outer peripheral side wall 322 of the second race 32. An inner diameter end of the retainer 34 is locked by a locking portion 312a provided on an inner diameter peripheral wall 312 of the first race 31, and an outer diameter end of the retainer 34 is The race 32 is locked by a locking portion 322 a provided on the outer peripheral side wall 322. The retainer 34 is formed with a plurality of accommodation holes 340 for accommodating the plurality of needle rollers 33, respectively, penetrating in the axial direction.

  The cylindrical portion 313 of the first race 32 is fitted to a fitting surface 22b axially adjacent to the raceway surface 22a of the inner race 22. Both the raceway surface 22a and the fitting surface 22b are a part of the outer peripheral surface of the inner ring 22, and are formed to have the same diameter. In other words, a fitting surface 22b is formed in an annular shape at the end of the outer peripheral surface of the inner ring 22 opposite to the flange portion 221, and a raceway surface 22a is formed closer to the flange portion 221 than the fitting surface 22b. I have.

  In the axial movement of the cylindrical roller 23 with respect to the inner ring 22, the movement to one side in the axial direction is regulated by the flange portion 221, and the movement to the other side in the axial direction is regulated by contact with the first race 31. In the present embodiment, the movement of the cylindrical roller 23 to the other side in the axial direction with respect to the inner race 22 is restricted by the contact of the first race 31 with the flange portion 314.

(Assembly procedure of rolling bearing 1)
Next, an assembly procedure (manufacturing method) when manufacturing the rolling bearing 1 will be described.

  When manufacturing the rolling bearing 1, after assembling the radial bearing part 2 and the thrust bearing part 3, respectively, it combines with the radial bearing part 2 and the thrust bearing part 3, as shown in FIG. When assembling the radial bearing portion 2, the cage 24 is arranged inside the outer ring 21, the cylindrical rollers 23 are housed in the plurality of housing holes 240 from the inside of the cage 24, and thereafter, are held by the cage 24. This is performed by disposing the inner ring 22 inside the plurality of cylindrical rollers 23 from the end on the fitting surface 22b side.

  On the other hand, in assembling the thrust bearing portion 3, the needle rollers 33 are accommodated in the plurality of accommodation holes 340 of the cage 34, and the outer and inner ends of the cage 34 are attached to the first race 31. The locking is performed by locking the locking portion 312a and the locking portion 322a of the second race 32, respectively. Then, the radial bearing portion 2 and the thrust bearing portion 3 are relatively moved in the axial direction as shown in FIG. 3, and the cylindrical portion 313 of the first race 31 is fitted to the fitting surface 22b of the inner race 22.

  This fitting is performed until the side surface 311b of the race portion 311 of the first race 31 opposite to the raceway surface 311a contacts the side surface 22c of the inner race 22. When the side surface 311b of the raceway portion 311 of the first race 31 comes into contact with the side surface 22c of the inner race 22, the cylindrical roller 23 is provided between the flange portion 221 of the inner race 22 and the flange portion 314 of the first race 31. A gap slightly larger than the axial length is formed.

  In the present embodiment, the inner diameter of the cylindrical portion 313 of the first race 31 is slightly smaller than the outer diameter of the fitting surface 22 b of the inner race 22, and the cylindrical portion 313 of the first race 31 is 22b is press-fitted. Thereby, the radial bearing portion 2 and the thrust bearing portion 3 are joined and integrated, and the rolling bearing 1 is completed.

(Modification 1)
FIG. 4 is a cross-sectional view showing a rolling bearing 1A according to a first modification of the first embodiment. In the rolling bearing 1 described with reference to FIG. 2 and the like, the first race 31 is provided with a flange portion 314 protruding radially outward from the cylindrical portion 313, and the inner ring 22 is formed by the flange portion 314. The movement of the cylindrical roller 23 in the axial direction on the other side (the side opposite to the flange portion 221) is restricted, but in the rolling bearing 1A according to the first modification, the first race 31 is provided with the flange portion 314. The movement of the cylindrical roller 23 to the other side in the axial direction is restricted by the contact of the cylindrical portion 313 with the end surface 313a. The cylindrical portion 313 is press-fitted to the fitting surface 22b of the inner ring 22. In FIG. 4, portions corresponding to the respective components of the rolling bearing 1 described with reference to FIG. 2 and the like are denoted by the same reference numerals as those in FIG. 2, and redundant description will be omitted.

(Modification 2)
FIG. 5 is a cross-sectional view illustrating a rolling bearing 1B according to Modification 2 of the first embodiment. The rolling bearing 1B is different from the raceway surface 22a of the inner race 22 continuously to the raceway portion 311 instead of the cylindrical portion 313 and the flange portion 314 in the first race 31 of the rolling bearing 1 described with reference to FIG. It has an annular wall 315 protruding radially outward. The track portion 311 and the annular wall portion 315 form an annular and flat plate portion 316, and the annular wall portion 315, which is a part of the flat plate portion 316, faces the flange portion 221 of the inner ring 22 in the axial direction. It is arranged. The movement of the cylindrical roller 23 to the other side in the axial direction (the side opposite to the flange 221) with respect to the inner ring 22 is regulated by the contact with the annular wall 315.

  The inner ring 22 of the rolling bearing 1B is provided with a fitting portion 222 having an annular fitting surface 222a having an outer diameter smaller than the raceway surface 22a at a position radially inward of the second flange portion 212. ing. In the first race 31, the inner peripheral side wall portion 312 is fitted to the fitting surface 222 a which is the outer peripheral surface of the fitting portion 222 by press-fitting, and is fixed to the inner race 22.

(Operations and effects of the first embodiment and its modification)
According to the above-described first embodiment and its modification, the axial movement of the cylindrical roller 23 with respect to the inner ring 22 is restricted by the flange 221, and the other axial direction of the cylindrical roller 23 with respect to the inner ring 22. Movement to is restricted by contact with the first race 31. As a result, the radial bearing portion 2 and the thrust bearing portion 3 are integrated, and the work of assembling the rolling bearings 1, 1 </ b> A, 1 </ b> B to the assembly target 4 is facilitated.

  In the rolling bearings 1 and 1A, the cylindrical portion 313 of the first race 32 is fitted to the fitting surface 22b of the inner race 22, and in the rolling bearing 1B, the inner race 22 is fitted to the inner peripheral side wall 312 of the first race 31. Since the radial bearing portion 2 and the thrust bearing portion 3 are more firmly integrated with each other because the fitting portion 222 is fitted to the fitting portion 222, the work of assembling to the assembly target 4 is further facilitated. Further, in the rolling bearing 1B, the axial space of the entire bearing can be made smaller and more compact by fitting the thrust bearing portion 3 into the fitting portion 222.

[Second embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 6 is a cross-sectional view illustrating an example of a state where the rolling bearing 5 according to the second embodiment of the present invention is assembled to an assembly target 8. FIG. 7 is a sectional view showing a part of the rolling bearing 5 in an enlarged manner.

  The assembly target 8 shown in FIG. 6 has a housing 81 as a non-rotating fixed member and a shaft 82 as a rotating member. The shaft 82 has a large diameter portion 821 and a small diameter portion 822, and a step surface 82a is formed between the large diameter portion 821 and the small diameter portion 822. The rolling bearing 5 is housed in a concave portion 810 formed in the housing 81, and supports the shaft 82 rotatably with respect to the housing 81.

  The rolling bearing 5 has a radial bearing portion 6 that receives a radial radial load and a thrust bearing portion 7 that receives an axial thrust load. The radial bearing portion 6 includes an outer ring 61 as a pair of radial race rings and It has an inner ring 62, a plurality of cylindrical rollers 63 as radial rolling elements, and a retainer 64 for rotatably holding the plurality of cylindrical rollers 63. The outer ring 61 is fitted in the recess 810.

  As shown in FIG. 7, the inner ring 62 has first and second flange portions 621 and 622 at both ends in the axial direction. The outer peripheral surface of the inner ring 62 between the first flange portion 621 and the second flange portion 622 is a raceway surface 62a on which the plurality of cylindrical rollers 63 roll, and the axial direction of the cylindrical roller 63 with respect to the inner ring 62. The movement is regulated by the first and second flanges 621 and 622. A raceway surface 61 a on which the cylindrical rollers 63 roll is formed on the outer race 61 at a position radially facing the raceway surface 62 a of the inner race 62. The outer race 61 has a flange portion 611 that protrudes radially inward from the raceway surface 61a and restricts axial movement of the cylindrical roller 63 on one axial side of the raceway surface 61a. The retainer 64 has an annular shape in which a plurality of accommodation holes 640 for accommodating a plurality of cylindrical rollers 63 respectively penetrate in the radial direction.

  The thrust bearing portion 7 includes first and second races 71 and 72, needle rollers 73 as a plurality of thrust rolling elements disposed between the first and second races 71 and 72, and a plurality of needles. And a retainer 74 for retaining the roller 73. In the present embodiment, the thrust bearing 7 is arranged alongside the outer ring 61 in the axial direction. The first race 71 corresponds to the thrust race of the present invention, and rotates with the outer race 61 with respect to the second race 72.

  The first race 71 includes a ring-shaped orbital track portion 711, an outer-diameter-side peripheral wall portion 712 protruding from the outer-diameter end of the track portion 711 to the other side in the axial direction, and an inner-diameter side of the track portion 711. A cylindrical cylindrical portion 713 protruding axially from the end toward the opposite side to the outer diameter side peripheral wall portion 712, and a radially inward direction from one axial end of the cylindrical portion 713. It has a protruding flange portion 714 integrally. The second race 72 integrally has an annular plate-shaped orbital portion 721 and an inner diameter side peripheral wall portion 722 protruding to one axial side from an inner end of the orbital portion 721. The needle rollers 73 roll on the raceway surfaces 711a, 721a of the raceways 711, 721 of the first and second races 71, 72. In the thrust bearing 7, the second race 72 may be omitted.

  The retainer 74 is disposed between the outer peripheral wall 712 of the first race 71 and the inner peripheral wall 722 of the second race 72. The outer diameter end of the retainer 74 is locked by a locking portion 712a provided on the outer diameter peripheral wall portion 712 of the first race 71, and the inner diameter end of the retainer 74 is The race 72 is locked by a locking portion 722 a provided on the inner peripheral side wall 722. The retainer 74 is formed with a plurality of accommodation holes 740 that respectively accommodate the plurality of needle rollers 73 so as to penetrate in the axial direction.

  The cylindrical portion 713 of the first race 71 is press-fitted and fitted to a fitting surface 61b axially adjacent to the raceway surface 61a of the outer race 61. Due to the press-fitting of the cylindrical portion 713, the side surface 711 b of the race portion 711 of the first race 71 opposite to the raceway surface 711 a abuts the side surface 61 c of the inner race 61. Both the raceway surface 61a and the fitting surface 61b are part of the inner peripheral surface of the outer race 61, and are formed to have the same diameter. In the axial movement of the cylindrical roller 73 with respect to the outer race 61, the movement to one side in the axial direction is regulated by the flange portion 611, and the movement to the other side in the axial direction is regulated by contact with the first race 71. In the present embodiment, the movement of the cylindrical roller 63 to the other side in the axial direction with respect to the outer race 61 is restricted by the contact of the first race 71 with the flange portion 714.

  The same operation and effect as in the first embodiment can be obtained also by the rolling bearing 5 according to the second embodiment formed as described above. Further, similarly to the first modification of the first embodiment described with reference to FIG. 4, the flange portion 714 of the first race 71 is omitted, and the cylindrical roller 713 is formed by the axial end surface of the cylindrical portion 713. The movement to the other side in the axial direction may be restricted.

  Furthermore, similarly to the second modification of the first embodiment described with reference to FIG. 5, a fitting portion having an annular fitting surface having an inner diameter larger than the raceway surface 61a is formed on the outer race 61, The outer peripheral side wall portion 712 of the first race 71 is fitted and fixed to this fitting portion, and the radially inner side of the raceway surface 61a of the outer race 61 is continuously connected to the raceway portion 711 of the first race 71. A projecting annular wall portion may be provided, and the movement of the cylindrical roller 63 to the other axial side may be restricted by the annular wall portion. In this case, the track portion 711 and the annular wall portion form an annular and flat plate portion.

(Note)
As described above, the present invention has been described based on the first and second embodiments, but these embodiments do not limit the invention according to the claims. Also, it should be noted that not all combinations of the features described in the embodiments are necessarily indispensable for means for solving the problems of the invention. Further, the present invention can be appropriately modified and implemented without departing from the spirit thereof.

1, 1A, 1B: rolling bearing 2: radial bearing 21: outer ring (radial race) 22: inner race (radial race)
221, flange 22a, raceway surface 22b, fitting surface 23, cylindrical roller (radial rolling element)
3. Thrust bearing portion 31. First race (thrust race)
311a ... raceway surface 313 ... cylindrical part 314 ... flange part 315 ... annular wall part 316 ... flat plate part 33 ... needle roller 5 ... rolling bearing 6 ... radial bearing part 61 ... outer ring (radial raceway ring) 611 ... flange part 61a ... track Surface 61b: mating surface 62: inner ring (radial race) 63: cylindrical roller (radial rolling element)
7 thrust bearing 71 71 first race (thrust race)
711a: raceway surface 713: cylindrical portion 714 ... flange portion 73: needle roller (thrust rolling element)

Claims (5)

A rolling bearing device having a radial bearing portion and a thrust bearing portion,
The radial bearing portion includes a pair of radial race rings arranged concentrically side by side in a radial direction, and a plurality of radial rolling elements disposed between the pair of radial race rings,
The thrust bearing portion includes a plurality of thrust rolling elements and a thrust bearing ring having a raceway surface on which the thrust rolling elements roll, and one of the pair of radial bearing rings and a radial bearing ring. Are arranged side by side in the direction,
The one radial raceway has a flange portion on one axial side that protrudes radially from a raceway surface on which the radial rolling element rolls to restrict axial movement of the radial rolling element,
Movement of the radial rolling element to the other side in the axial direction with respect to the one radial race is restricted by contact with the thrust race.
Rolling bearing device. The thrust bearing ring has a cylindrical portion fitted to a fitting surface axially adjacent to the raceway surface of the one radial bearing ring,
Movement of the radial rolling element to the other side in the axial direction is restricted by contact with an end surface of the cylindrical portion,
The rolling bearing device according to claim 1. The thrust bearing ring has a cylindrical portion fitted to a fitting surface axially adjacent to the raceway surface of the one radial bearing ring, and a radial direction extending from one end of the cylindrical portion in the axial direction. With a protruding flange portion,
Movement of the radial rolling element to the other side in the axial direction is regulated by contact with the flange portion.
The rolling bearing device according to claim 1. The thrust bearing ring has an annular flat plate portion including the raceway surface, and a part of the flat plate portion is disposed so as to face the flange portion in the axial direction,
Movement of the radial rolling element to the other side in the axial direction is restricted by contact with the part of the flat plate portion,
The rolling bearing device according to claim 1. The radial bearing portion is a cylindrical roller bearing having a cylindrical roller as the radial rolling element,
The thrust bearing portion is a needle roller bearing having a needle roller as the thrust rolling element,
The rolling bearing device according to claim 1.

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