JP2017034736A - Structure for supplying oil to bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for supplying oil to a bearing, which is able to stably supply the oil to the bearing of a rotary electric machine by a simple structure.SOLUTION: In a structure for supplying oil to a bearing, a rotor 3 that rotates with respect to a stator 4 is accommodated in a rotary electric machine chamber (motor chamber) 6 in a housing 5 having a stator 4, a shaft 2 forming a rotary shaft for the rotor 3 is rotatably supported in the housing 5 via a bearing (a pres-stage bearing) 9, and oil 12 sealed in the rotary electric machine chamber (motor chamber) 6 is supplied to the stator 4 and rotor 3 as a coolant and also supplied to the bearing (pre-stage bearing) 9 as lubricant.The structure comprises an oil feed hole 16 upwardly extending through a composing member of the housing 5 with the bearing (pre-stage bearing) 9 from the position of the bearing (pre-stage bearing) 9 and opening in the surface of the composing member of the housing 5 which surface is on the side of the rotary electric machine chamber (motor chamber) 6.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oil supply structure for supplying oil as a lubricant to a bearing in a rotating electrical machine such as a motor used in a hybrid vehicle or the like.

  In recent years, hybrid vehicles that have been developed include a rotating electric machine in addition to an engine as a power source, and use the engine and the power of the rotating electric machine as a motor together or depending on driving conditions to improve fuel efficiency. It is what I did. In the case of a hybrid vehicle, the rotating electrical machine is configured as a motor generator that functions not only as a motor but also as a generator. Is stored in the battery.

  Such a rotating electric machine needs to be cooled in the same manner as the engine during operation because the rotor and stator generate heat when energized as they are driven. As a cooling medium, oil is generally used.

  Cooling of the rotating electrical machine with oil is performed by, for example, enclosing oil in a housing that houses a rotor or stator that constitutes the rotating electrical machine, sucking up the oil by an oil pump from an oil pan formed in the lower part of the housing, This is done by dripping from the oil and circulating the oil in the housing.

  Such oil circulation serves not only to cool the rotating electrical machine but also to supply oil as a lubricant to a bearing provided in the rotating electrical machine. That is, in the rotating electrical machine as described above, the shaft is rotatably supported with respect to the housing via a bearing in order to rotate the rotor provided on the shaft side with respect to the housing side provided with the stator. By circulating the oil, the stator and the rotor are cooled, and the oil is supplied to the bearing at the same time, while maintaining the lubrication of the bearing, the temperature rise due to the frictional heat is reduced and the seizure is prevented.

  Incidentally, as a document showing a general technical level related to a cooling structure of a rotating electric machine by such oil circulation or an oil supply structure to a bearing, for example, there is Patent Document 1 below.

JP 2013-177102 A

  By the way, in the conventional system in which oil is circulated using the oil pump as described above, the sucked-up oil is supplied from above the housing, and the oil flows downward according to gravity and is supplied to the rotating electrical machine and the bearing. It is structured. However, when supplying oil, there is no particular route for guiding oil, and it is left to the oil to naturally flow down along the wall surface of the housing, the surface of the stator, and the rotor. As a result, it was not always possible to supply oil stably.

  In recent years, from the viewpoint of cost reduction, in addition to the oil pump, piping for circulating oil has been abolished, and the conventional circulation method using an oil pump that requires a complicated structure has been abolished. It is considered that oil is sprinkled up by rotation of the rotor and oil is supplied to the rotating electrical machine or bearing. When such a system is adopted, the supply of oil to the bearing may be more unstable than the system in which oil is circulated by an oil pump.

  In view of such circumstances, the present invention intends to provide an oil supply structure to a bearing capable of stably supplying oil to a bearing of a rotating electrical machine with a simple structure.

  The present invention accommodates a rotor that rotates relative to the stator in a rotating electrical machine chamber in a housing having a stator, and rotatably supports a shaft that forms a rotation axis of the rotor on the housing via a bearing, An oil supply structure to a bearing that supplies oil sealed in the rotating electrical machine chamber as a coolant to the stator and the rotor and supplies the bearing as a lubricant, and is a component of the housing including the bearing. An oil supply structure to the bearing is provided, comprising an oil supply hole penetrating upward from the position of the bearing and opening in the rotating electrical machine chamber side surface of the constituent member of the housing.

  In this way, oil can be supplied from the inside of the constituent member of the housing to the bearing that is provided in the housing and supports the shaft.

  In the oil supply structure to the bearing of the present invention, an oil guide member protruding on the surface of the rotating electrical machine chamber side of the constituent member of the housing is provided, and the oil flowing down is guided toward the upper end of the oil supply hole by the oil guide member. It is preferable to make such a configuration, and in this way, the flow path of the oil flowing down can be directed to the oil supply hole.

  In the oil supply structure to the bearing of the present invention, the oil enclosed in the rotating electrical machine chamber is sprung up by the rotation of the rotor, and the oil is supplied to the stator, the rotor, and the bearing provided in the rotating electrical machine chamber. It is preferable to configure so that oil can be supplied to the bearing while the cooling structure of the rotating electrical machine is a simple structure that eliminates the oil pump.

  In the oil supply structure to the bearing of the present invention, as the oil guide member, a position above the shaft in the rotating electrical machine chamber and a position behind the position where the upper end of the oil supply hole is opened in the rotation direction of the rotor It is preferable to provide an oil guide wall extending in the radial direction at the position, so that the oil splashed up by the rotor can be captured above in the rotating electrical machine chamber.

  In the oil supply structure to the bearing of the present invention, the oil guide member preferably includes an oil guide subwall extending along the radial direction so as to face the oil guide wall across the upper end of the oil supply hole, In this way, the oil captured by the oil guide wall can be more reliably guided to the oil supply hole.

  In the oil supply structure to the bearing of the present invention, as the oil guide member, between the oil guide wall and the oil guide subwall, the oil guide wall and the oil guide subwall are directed from one to the other. It is preferable that the upper end of the oil supply hole is opened below the guide slope, and the oil trapped by the oil guide wall can be more reliably secured. It can be led to the oiling hole.

  According to the oil supply structure to the bearing of the present invention, various excellent effects as described below can be obtained.

  (I) According to the first aspect of the present invention, since oil is supplied to the bearing from the inside of the constituent member of the housing, the oil can be stably supplied to the bearing.

  (II) According to the invention described in claim 2 of the present invention, the oil flowing down the surface of the constituent member of the housing is collected and poured into the oil supply hole, so that the supply of oil to the bearing is made more reliable. Can do.

  (III) According to the invention described in claim 3 of the present invention, the rotating electrical machine can be cooled with a simple structure that eliminates the circulation structure by the oil pump, and the oil can be supplied to the bearing. Costs for surrounding piping can be reduced.

  (IV) According to the invention described in claims 4 to 6 of the present invention, the oil splashed up by the rotor can be captured and directed to the oil supply hole, so that a simple structure in which the circulation structure by the oil pump is eliminated. Even so, the oil supply to the bearing can be ensured.

It is sectional drawing which shows the motor unit of the hybrid vehicle to which this invention is applied. It is a perspective view which shows a part of motor unit of the hybrid vehicle to which this invention is applied.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 and 2 show an example of a configuration of an oil supply structure to a bearing according to an embodiment of the present invention. An example in which the present invention is applied to a motor unit of a hybrid vehicle having a motor generator as a rotating electric machine is illustrated. Yes. As shown in FIG. 1, the motor unit 1 disposed between the front-stage engine and the rear-stage transmission is horizontally arranged with one end on the engine side (left side in the figure) and the other end on the transmission side (right side in the figure). A rotor 3 formed in an annular shape around the shaft 2 and an annular stator 4 disposed so as to surround the rotor 3 are provided on the outer periphery of the rotor 3. The rotor 3 and the stator 4 are accommodated in a rotating electrical machine chamber (motor chamber) 6 formed inside the housing 5.

  The housing 5 is a substantially cylindrical container member formed by stacking two stages of a front retainer 7 and a rear retainer 8. The front retainer 7 includes a bottom surface 7b on one end side in the axial direction of the substantially cylindrical side surface 7a, and the bottom surface 7b projects stepwise outward from the outer periphery toward the center in the axial direction of the side surface 7a. It has a generally conical shape. Out of both axial end portions of the side surface 7a, the end portion on the side where the bottom surface 7b is not provided is an opening. A hole 7c through which the shaft 2 passes is opened at the center of the bottom surface 7b.

  The rear-stage retainer 8 is configured to include a substantially disc-shaped bottom surface 8b on one end side in the axial direction of the substantially cylindrical side surface 8a. Of the both end portions in the axial direction of the side surface 8a, the side where the bottom surface 8b is not provided. The end is an opening. A hole 8c through which the shaft 2 passes is opened at the center of the bottom surface 8b.

  The outer peripheral portion of the bottom surface 7 b of the front retainer 7 is fastened to the edge of the side surface 8 a of the rear retainer 8, and the motor chamber 6 is formed as an internal space between the front retainer 7 and the rear retainer 8. In the motor chamber 6, the stator 4 is fixed to the inner peripheral surface of the side surface 8 a of the rear retainer 8, and the rotor 3 is disposed on the radially inner side. The shaft 2 passes through holes 7c and 8c opened at the center of the bottom surface 7b of the front stage retainer 7 and the bottom surface 8b of the rear stage retainer 8, and is provided with bearings (front stage bearings 9, 9c) provided at the edges of the holes 7c and 8c, respectively. It is rotatably supported with respect to the housing 5 via a rear stage bearing 10). In this manner, the shaft 2 and the rotor 3 rotate with respect to the housing 5 and the stator 4 around the shaft 2. An internal space formed by the side surface 7a and the bottom surface 7b of the front retainer 7 is a clutch chamber 11, in which a clutch, a flywheel, etc. (not shown) are accommodated.

  The motor chamber 6 is further filled with oil 12 as a lubricant and a coolant. Here, the rear-stage retainer 8 constituting the motor chamber 6 is formed with an oil pan 13 having a large volume so as to store a sufficient amount of oil 12 in a lower portion thereof. The oil 12 is sealed in the motor chamber 6 to a height at which a part of the rotor 3 comes into contact with at least the surface of the oil 12.

  The front side of the front stage bearing 9 provided in the hole 7c in the bottom surface 7b of the front stage retainer 7 and the rear side of the rear stage bearing 10 provided in the hole 8c in the bottom surface 8b of the rear stage retainer 8 (that is, the front stage bearing 9 and the rear stage bearing 10). , Oil seals 14 and 15 are provided on the outer sides of the motor chamber 6, respectively, and are sealed so that the oil 12 does not leak out of the motor chamber 6.

  An oil supply hole 16 is provided inside the constituent member of the bottom surface 7b of the front retainer 7 so as to penetrate from the front bearing 9 provided at the edge of the hole 7c toward the surface of the upper bottom surface 7b.

  Furthermore, in the case of the present embodiment, a plurality of oil guide members (oil guide wall 17, oil guide subwall 18, guide slope 19) projecting from the surface are provided on the surface of the bottom surface 7b on the motor chamber 6 side.

  As shown in FIG. 2, the front retainer 7 includes a plurality of ribs 7 d that extend radially from the center toward the outer periphery on the surface of the bottom surface 7 b on the motor chamber 6 side. Among the plurality of ribs 7d, the uppermost rib 7d is configured as an oil guide wall 17 whose height from the bottom surface 7b is set higher than that of the other ribs 7d. An upper end 16a of the oil supply hole 16 is opened in the vicinity of 17 (right side in the figure). In this embodiment, the rotor 3 (not shown) is positioned on the front side of the front retainer 7 in FIG. 2, and the rotor 3 is counterclockwise with respect to the front retainer 7. Rotate. That is, the oil guide wall 17 is located on the back side of the upper end 16 a of the oil supply hole 16 with respect to the rotation direction of the rotor 3.

  The oil guide sub-wall 18 is a member that extends along the radial direction so as to face the oil guide wall 17 across the upper end 16a of the oil supply hole 16. That is, with respect to the rotation direction of the rotor 3, the oil guide subwall 18, the upper end 16 a of the oil supply hole 16, and the oil guide wall 17 are arranged in this order from the front. The oil guide sub-wall 18 is set so that the height from the bottom surface 7 b is lower than the oil guide wall 17. The length in the radial direction is about half of the radius of the bottom surface 7b, and is provided only on the inner side in the radial direction on the bottom surface 7b and not on the outer side.

  The bottom surface 7b between the oil guide wall 17 and the oil guide subwall 18 is provided with a guide slope 19 that descends obliquely along the bottom surface 7b in the direction from the oil guide subwall 18 to the oil guide wall 17. An upper end 16 a of the oil supply hole 16 is opened below the guide slope 19.

  Here, the case where the oil guide wall 17 is formed by changing the height of the existing rib 7d on the bottom surface 7b has been described as an example. However, if the rib 7d does not exist at an appropriate position on the bottom surface 7b, the oil guide The wall 17 may be newly provided separately from the rib 7d. Further, the oil guide sub-wall 18 may be formed by using the rib 7d or may be newly provided.

  Next, the operation of this embodiment will be described.

  When the motor unit 1 is driven, the rotor 3 rotates with respect to the stator 4 together with the shaft 2 (see FIG. 1). At this time, the rotor 3 partially contacts the oil 12 sealed in the motor chamber 6 in the housing 5, so that the oil 12 is splashed up in the motor chamber 6 as it rotates. By doing so, the oil 12 is applied to the entire rotor 3 and the stator 4 constituting the rotating electrical machine, and the heat generated by the driving is cooled by the oil 12.

  Further, the oil 12 that has been splashed flows down along the surfaces of the bottom surface 7 b of the front retainer 7 and the bottom surface 8 b of the rear retainer 8 that constitute the motor chamber 6, and thereby flows into the motor chamber 6 and the front bearing 9 and the rear bearing 10. Oil 12 as a lubricant is supplied from the side.

  Further, in the case of the present embodiment, as described above, the oil supply hole 16 is provided so as to penetrate from the front stage bearing 9 toward the surface of the upper bottom surface 7b. For this reason, the oil 12 that has flowed down the bottom surface 7b enters the upper end 16a of the oil supply hole 16 opened on the motor chamber 6 side surface of the bottom surface 7b, so that not only the motor chamber 6 side with respect to the front bearing 9, Oil 12 is also supplied from the inside of the constituent members of the bottom surface 7b.

  Here, in this embodiment, as described above, the oil guide wall 17, the oil guide sub-wall 18, and the guide slope 19 are provided as oil guide members on the surface of the bottom surface 7 b on the motor chamber 6 side as shown in FIG. As a result, the oil 12 flowing down the bottom surface 7 b is efficiently guided to the upper end 16 a of the oil supply hole 16. Hereinafter, the operation of the oil guide member will be described.

  As shown in FIG. 2, the rotor 3 rotates counterclockwise as viewed from the transmission side, and the oil 12 is also splashed counterclockwise according to this movement. The oil 12 splashed counterclockwise collides with the right side in the figure of the oil guide wall 17 provided in the radial direction above the bottom surface 7b of the front stage retainer 7, and is captured here. At this time, as described above, the height from the bottom surface 7b of the oil guide wall 17 is set higher than that of the other ribs 7d and the oil guide sub-wall 18, so that the oil guide wall 17 is flipped up. At least a part of the oil 12 can be captured without being obstructed by the ribs 7d and the oil guiding subwall 18.

  The oil 12 captured on the right side of the oil guide wall 17 flows down from here on the surface of the bottom surface 7b. At this time, the oil 12 does not necessarily travel straight down the surface of the bottom surface 7b, and the course of the oil 12 may be swung to the left or right. However, in this embodiment, the oil guide sub-wall is on the right side of the oil guide wall 17. 18 is arranged. Therefore, the oil 12 flowing down the surface of the bottom surface 7b is blocked by the oil guide wall 17 on the left side and the oil guide subwall 18 on the right side, and a region between both guide walls (the oil guide wall 17 and the oil guide subwall 18). It is gathered by and heads downward.

  Furthermore, in this embodiment, as described above, the guide slope 19 is provided between the oil guide wall 17 and the oil guide sub-wall 18, and the oil 12 heading downward flows down along the guide slope 19. become. An upper end 16 a of the oil supply hole 16 is opened below the guide slope 19, and the oil 12 is supplied from here through the oil supply hole 16 to the lower front bearing 9. In this way, the oil 12 captured by the oil guide wall 17 passes through the path indicated by the broken arrow in FIG. 2, for example, and is guided through the surface of the bottom surface 7 b to the upper end 16 a of the oil supply hole 16. . As described above, in the oil supply structure provided with the oil supply path by the oil supply hole 16 and the oil guide member (the oil guide wall 17, the oil guide sub-wall 18, the guide slope 19) of the present embodiment, the oil splashed up by the rotor 3. 12 is captured by the surface of the front retainer 7, and the oil 12 flowing down the surface is directed toward the upper end 16 a of the oil supply hole 16, and the oil 12 can be collected and poured into the oil supply hole 16. As described above, in the system in which oil is sprinkled up by the rotation of the rotor and the oil is supplied, the oil supply to the rotor and stator above the motor unit tends to become unstable compared to the conventional circulation system using an oil pump. However, in the present embodiment, the oil 12 that has been bounced up can be guided to the pre-stage bearing 9 through the oil supply path, and the oil 12 as a lubricant can be reliably supplied. In this way, the front stage bearing 9 can be lubricated and cooled to prevent seizure and to maintain a long life.

  Such an oil supply path is also effective in a motor unit that employs a conventional circulation system using an oil pump. That is, conventionally, the sucked-up oil has only been dropped from above the rotor or stator, and the structure has not been designed to actively supply oil to the bearing. If the member is provided, oil that has flowed down from above can be reliably supplied to the bearing.

  In this embodiment, the case where the bottom surface 7b of the front stage retainer 7 is provided with the oil supply path as described above is described as an example. However, the same structure is provided on the rear stage retainer 8 side, and the oil 12 is supplied to the rear stage bearing 10. Of course, it may be supplied. Further, a part or all of the same oil supply path may be provided in the front retainer 7 and the rear retainer 8 respectively. For example, in the case of a rotating electrical machine in which the rotor can rotate in both directions, the upper ends of the oil supply holes may be opened on both sides in the circumferential direction of the oil guide wall.

  As described above, in the present embodiment, the rotor 3 that rotates relative to the stator 4 is accommodated in the rotating electrical machine chamber (motor chamber) 6 in the housing 5 that includes the stator 4, and the rotating shaft of the rotor 3. The shaft 2 is supported on the housing 5 via a bearing (front stage bearing) 9 so as to be rotatable, and the oil 12 enclosed in the rotating electrical machine chamber (motor chamber) 6 is supplied to the stator 4 and the rotor 3 as a coolant. An oil supply structure for a bearing to be supplied as a lubricant to a bearing (front-stage bearing) 9, wherein a component (front-stage retainer 7) of the housing 5 including the bearing (front-stage bearing) 9 is connected to the bearing (front-stage bearing) 9. An oil supply hole 16 that penetrates upward from the position and opens on the surface of the constituent member of the housing 5 (front retainer 7) on the rotating electrical machine chamber (motor chamber) 6 side. Since comprises, provided in the housing 5 relative to the bearing (front bearing) 9 for supporting the shaft 2, it is possible to supply oil 12 from the inner components of the housing 5 (front retainer 7).

  In this embodiment, the oil guide members (oil guide wall 17, oil guide sub-wall 18, guide slope 19) projecting from the rotating electrical machine chamber (motor chamber) 6 side surface of the structural member (front retainer 7) of the housing 5. ), And the oil 12 that flows down is guided toward the upper end 16a of the oil supply hole 16 by the oil guide member (oil guide wall 17, oil guide sub-wall 18, guide slope 19). The flow path can be directed to the oil supply hole 16.

  In the present embodiment, the oil 12 enclosed in the rotating electrical machine chamber (motor chamber) 6 is sprung up by the rotation of the rotor 3, and the stator 4 and the rotor 3 provided in the rotating electrical machine chamber (motor chamber) 6; Since the oil 12 is supplied to the bearing (front stage bearing) 9, the cooling structure of the rotating electrical machine is a simple structure without the oil pump, but the oil 12 to the bearing (front stage bearing) 9 is Supply can be made.

  In the present embodiment, the oil guide member is a position above the shaft 2 in the rotating electrical machine chamber (motor chamber) 6 and a position where the upper end 16a of the oil supply hole 16 is opened in the rotational direction of the rotor 3. Since the oil guide wall 17 extending in the radial direction is provided at the position on the back side, the oil 12 splashed up by the rotor 3 can be captured above in the rotating electrical machine chamber (motor chamber) 6.

  In the present embodiment, the oil guide member includes an oil guide subwall 18 extending along the radial direction so as to face the oil guide wall 17 with the upper end 16a of the oil supply hole 16 interposed therebetween. The oil 12 captured by the guide wall 17 can be more reliably guided to the oil supply hole 16.

  In this embodiment, the oil guide member is inclined downwardly from one of the oil guide wall 17 and the oil guide subwall 18 toward the other between the oil guide wall 17 and the oil guide subwall 18. Since the guide slope 19 is provided and the upper end 16a of the oil supply hole 16 opens below the guide slope 19, the oil 12 captured by the oil guide wall 17 is more reliably guided to the oil supply hole 16. Can do.

  Therefore, according to the present embodiment, the oil 12 is supplied to the bearing (front stage bearing) 9 from the inside of the constituent member (the front stage retainer 7) of the housing 5, so that the oil 12 is supplied to the bearing (front stage bearing) 9. It can be performed stably.

  Further, according to the present embodiment, the oil 12 that flows down the surface of the constituent member (the front retainer 7) of the housing 5 is collected and poured into the oil supply hole 16, so that the oil 12 is supplied to the bearing (front bearing) 9 more. Can be sure.

  Further, according to this embodiment, since the rotating electrical machine can be cooled and oil can be supplied to the bearing with a simple structure that eliminates the circulation structure by the oil pump, the cost for the oil pump and the surrounding piping can be reduced. Can be reduced.

  Further, according to the present embodiment, the oil 12 splashed up by the rotor 3 can be captured and directed to the oil supply hole 16, so that even if a simple structure without an oil pump circulation structure is used, the bearing (Pre-stage bearing) The supply of oil 12 to 9 can be ensured.

  In addition, the oil supply structure to the bearing of the present invention is not limited to the above-described embodiment, and a hybrid vehicle as described above may be used as long as it is of a type that includes a bearing and supplies oil in the housing. Needless to say, various modifications can be made without departing from the scope of the present invention, such as being applicable to various rotating electrical machines as well as motor generators.

2 Shaft 3 Rotor 4 Stator 5 Housing 6 Rotating electrical machine room (motor room)
9 Bearing (front bearing)
12 Oil 16 Oil supply hole 16a Upper end 17 Oil guide member (oil guide wall)
18 Oil guide member (Oil guide auxiliary wall)
19 Oil guide member (guide slope)

Claims (6)

A rotor that rotates relative to the stator is accommodated in a rotating electrical machine chamber in a housing having a stator, and a shaft that forms a rotating shaft of the rotor is rotatably supported by the housing via a bearing. The oil supply structure to the bearing which supplies the oil sealed in to the stator and the rotor as a coolant and supplies the bearing as a lubricant,
An oil supply to the bearing, characterized in that an oil supply hole is provided in a constituent member of the housing provided with the bearing so as to penetrate upward from the position of the bearing and open on a surface of the constituent member of the housing on the rotating electrical machine chamber side. Supply structure.   The oil guide member which protruded on the said rotating electrical machine room side surface of the structural member of the said housing was provided, and it comprised so that the oil which flows might be guided toward the upper end of the said oil supply hole by the said oil guide member. Oil supply structure to the described bearing.   The oil enclosed in the rotating electrical machine chamber is splashed by the rotation of the rotor, and the oil is supplied to the stator, the rotor, and the bearing provided in the rotating electrical machine chamber. The oil supply structure to the bearing according to claim 1 or 2.   As the oil guide member, an oil guide that extends along the radial direction at a position above the shaft in the rotating electrical machine chamber and at a position farther from the position where the upper end of the oil supply hole is opened in the rotation direction of the rotor. The oil supply structure to the bearing according to claim 3, further comprising a wall.   The oil to the bearing according to claim 4, wherein the oil guide member includes an oil guide subwall extending in a radial direction so as to face the oil guide wall across the upper end of the oil supply hole. Supply structure.   As the oil guide member, a guide slope is provided between the oil guide wall and the oil guide subwall, and is inclined downward from one of the oil guide wall and the oil guide subwall toward the other. 6. The oil supply structure to the bearing according to claim 5, wherein an upper end of the oil supply hole is opened below the slope.

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