TWI707522B - External rotor motor and assembly method thereof - Google Patents

Abstract

An external rotor motor includes a stator substructure, a first fixing member, a positioning member and a locking member. The stator structure is formed by combining a plurality of stator units with each other. The stator units includes a first stator unit and a second stator unit. The first stator unit has a first through hole. The second stator unit has a second through hole. The first fixing member is disposed on the stator structure. The first fixing member has a third through hole corresponding to the first through hole. The first fixing member further has a fourth through hole corresponding to the second through hole. The positioning member is disposed at the third through hole of the first fixing member and the first through hole of the first stator unit. The locking member is disposed at the fourth through hole of the first fixing member and the second through hole of the second stator unit. The present invention also discloses an assembly method of the external rotor motor.

Description

Outer rotor motor and its assembling method

The invention relates to an outer rotor motor and an assembly method thereof, and more particularly to an outer rotor motor with a combined stator structure and an assembly method thereof.

A motor is a driving device that generates a magnetic field by energizing a stator coil, thereby driving a rotor with permanent magnets to rotate, and then converting electrical energy into kinetic energy. General motors can be roughly divided into inner rotor motors and outer rotor motors. Take the outer rotor motor as an example. The outer rotor motor surrounds the rotor with permanent magnets on the outer side of the circular stator core coil, and fixes the inner stator core coil to rotate the outer rotor.

In the full-circular stator core of the conventional outer rotor motor, it is usually formed by stacking a plurality of silicon steel sheets. The manufacturing method of these silicon steel sheets is mainly formed by stamping on a steel coil, which is assembled into the stator After that, winding the iron core teeth of the stator. However, since the space between the two iron core teeth of the full-circle stator iron core is quite limited, the difficulty of winding is increased, especially for small outer rotor motors.

The object of the present invention is to provide an outer rotor motor with the advantage of easy winding and its assembly method.

To achieve the above objective, an external rotor motor according to the present invention includes a stator structure, a first fixing member, a positioning member and a locking member. The stator structure is composed of a plurality of stator units assembled in pairs. The stator units include a first stator unit and a second stator unit. The first stator unit has a first through hole, and the second stator unit has A second through hole. The first fixing member is arranged on the stator structure, the first fixing member has a third through hole corresponding to the first through hole, and the first fixing member further has a fourth through hole corresponding to the second through hole. The positioning member is arranged in the third through hole of the first fixing member and the first through hole of the first stator unit. The locking member is arranged in the fourth through hole of the first fixing member and the second through hole of the second stator unit.

In an embodiment, the first stator unit has an arc-shaped body, the arc-shaped body has a first side surface and a second side surface opposite to each other, the first side surface has a protruding portion, and the second side surface has a groove portion , The protruding part of the first stator unit is matched with the groove part of the adjacent stator unit.

In an embodiment, the number of positioning elements is multiple, and the lengths of the two positioning elements are different.

In one embodiment, the positioning member and the locking member are different components.

In an embodiment, the cross-sectional shape of the first through hole is different from that of the second through hole; the cross-sectional shape of the third through hole is different from that of the fourth through hole.

In one embodiment, the outer rotor motor further includes a fixing base, the stator structure is disposed on the fixing base, and the locking member is locked to the fixing base.

In an embodiment, the outer rotor motor further includes a second fixing member, which is disposed on a side of the stator structure away from the first fixing member. The second fixing member has a fifth through hole corresponding to one of the first through holes, and the positioning The piece is further arranged in the fifth through hole.

In an embodiment, the second fixing member further has a sixth through hole corresponding to one of the second through holes, and the locking member is further provided with a sixth through hole and is locked to the fixing base.

In one embodiment, the second fixing member further has a protruding part, the stator structure has a through part, and the protruding part is arranged in the through part and contacts the stator units.

In one embodiment, the outer rotor motor further includes a rotor structure, which is arranged corresponding to the stator structure. The rotor structure has a housing and a magnetic body. The housing is arranged on the stator structure, and the magnetic body is arranged on the housing facing a side of the stator structure. side.

In one embodiment, the outer rotor motor may be applied to electric bicycles, electric trolleys, electric golf carts, or electric water vehicles.

To achieve the above objective, an assembling method for an outer rotor motor according to the present invention includes: winding a plurality of stator units to obtain the stator units with a plurality of coils; assembling the stator units to obtain stators Structure; connect the coils on the stator units; use at least one positioning member to sequentially pass through a first fixing member, a stator structure and a second fixing member; use at least one locking member to sequentially pass through the first fixing member , The stator structure and the second fixing member; and, the stator unit and a rotor structure are correspondingly arranged.

As mentioned above, in the rotor motor and its assembly method outside of the present invention, the stator structure can be assembled through the first fixing member, positioning member and locking member after winding each stator unit. Therefore, the winding The time is not limited to the size of the stator structure. Even for a small motor, since each stator unit can be individually wound, the winding difficulty is not high, so that the rotor motor outside the present invention has the advantage of easy winding.

In an embodiment, by the design that the second fixing member has a protruding part, and the protruding part is arranged in the through part of the stator structure and contacts the stator units, the purpose of shaping and making the assembly of the stator structure more convenient can be achieved. And it can also reduce the noise and vibration when the outer rotor motor is running.

1: Outer rotor motor

11: fixed seat

12: Stator structure

121: The first stator unit

122: second stator unit

1211: curved body

1212: iron core teeth

1213: protrusion

1214: Groove

1215: outer peripheral surface

13: The first fixing part

14: positioning parts

15: Lock firmware

16, 16a: second fixing part

161: protrusion

17: Coil

18: Rotor structure

181: Hinge

182: Shell

183: Magnetic

H: Through part

h1: first through hole

h2: second through hole

h3: third through hole

h4: fourth through hole

h5: fifth through hole

h6: sixth through hole

h7: seventh through hole

h8: Eighth through hole

P1: First side

P2: second side

FIG. 1 is a schematic diagram of a stator structure of an outer rotor motor according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a stator unit in the stator structure of Fig. 1.

3 is a partial exploded schematic diagram of an outer rotor motor according to an embodiment of the invention.

Figure 4 is a schematic diagram of the combination of Figure 3.

Fig. 5 is a partial assembly diagram of a rotor motor outside an embodiment of the present invention.

6 is a schematic cross-sectional view of an outer rotor motor according to an embodiment of the invention.

FIG. 7 is a partially exploded schematic diagram of an outer rotor motor according to another embodiment of the invention.

Hereinafter, the rotor motor and its assembly method other than the embodiment of the present invention will be described with reference to related drawings, and the same components will be described with the same reference signs.

Fig. 1 is a schematic diagram of a stator structure of an outer rotor motor according to an embodiment of the present invention, Fig. 2 is a schematic diagram of a stator unit in the stator structure of Fig. 1, and Fig. 3 is a part of an outer rotor motor according to an embodiment of the present invention In an exploded view, FIG. 4 is a schematic view of the assembly of FIG. 3, FIG. 5 is a schematic view of a partial assembly of a rotor motor outside an embodiment of the present invention, and FIG. 6 is a schematic cross-sectional view of an outer rotor motor according to an embodiment of the present invention.

As shown in FIGS. 1 to 4, an outer rotor motor according to an embodiment of the present invention includes a stator structure 12, a first fixing member 13, at least one positioning member 14 and at least one locking member 15. In addition, the outer rotor motor may further include a fixing base 11 (Figure 3) and a second fixing member 16 (Figure 3).

The fixing base 11 is used to fix the stator structure 12. In some embodiments, the fixing seat 11 may be integrally formed with the outer rotor motor housing to form a single component; or, in some embodiments, the fixing seat 11 may also be an independent component independent of the outer rotor motor housing. The fixing base 11 of this embodiment is an example of an independent component independent of the outer rotor motor housing.

The stator structure 12 is arranged on the fixing base 11. The stator structure 12 is formed by connecting a plurality of stator units in pairs (FIG. 1). The stator structure 12 of this embodiment is formed by connecting 12 stator units in pairs. The stator units may include a first stator unit 121 and a second stator unit 122. As shown in FIG. 1, the first stator unit 121 has a first through hole h1, and the second stator unit 122 has a first Two through holes h2. The structures of the first stator unit 121 and the second stator unit 122 can be the same or different; the first stator unit 121 and the second stator unit 122 can be adjacent or non-adjacent stator units, and the number can be If they are the same or different, the present invention is not limited. FIG. 1 is an example that the first stator unit 121 and the second stator unit 122 have the same structure and are not adjacent to each other. Nevertheless, for the convenience of subsequent description, the first stator unit 121 and the second stator unit 122 are still referred to below.

FIG. 2 takes the first stator unit 121 as an example (the second stator unit 122 is not shown). As shown in FIG. 2, the first stator unit 121 has an arc-shaped body 1211 and an iron core tooth 1212. Here, the arc-shaped body 1211 has a first side surface P1 and a second side surface P2 opposite to each other. The first side surface P1 has a protruding portion 1213, the second side surface P2 has a groove portion 1214, and the first through hole h1 It penetrates through the arc-shaped body 1211, and the extension directions of the first through hole h1, the protruding portion 1213 and the recess portion 1214 are all the same, which are all parallel to the axial direction of the outer rotor motor. Therefore, the protruding portions 1213 of a plurality of stator units (for example, a plurality of first stator units 121 and a plurality of second stator units 122) are arranged in cooperation with the groove portions 1214 of adjacent stator units, so that 12 stators The units can be assembled in pairs to form the stator structure 12. Among them, the arc-shaped bodies 1211 of the 12 stator units can form a through portion H after being assembled. In addition, the arc-shaped body 1211 further has an outer peripheral surface 1215 extending from the first side surface P1 of the arc-shaped body 1211 to the second side surface P2, and the iron core teeth 1212 are integrally formed from the outer peripheral surface 1215 and extend outward.

In particular, the traditional full-circle stator core is usually made by stacking a plurality of silicon steel sheets, and these silicon steel sheets are mainly formed by stamping on a steel coil. However, the steel coil After the strip is stamped, there will be a lot of leftovers. These leftovers usually cannot be stamped again, and can only be recycled and reused, resulting in waste of materials, and relatively increasing the manufacture of full-circular stators. The cost of the core. Since the stator structure 12 of this embodiment is composed of multiple stator units, the area of a stator unit will naturally be much smaller than a full-circular stator core, and it will not be like a full-circular stator core because of its The central circular slot occupies extra space. Therefore, when stamping the silicon steel sheet material strip, multiple silicon steel sheets can be punched out according to the preset stamping position of the stator unit to form a stator unit, and then multiple stator units are combined into a stator unit. For the stator structure 12, compared with the prior art directly stamping the silicon steel sheet of the entire full-circular stator core, the method of forming the stator structure 12 by a plurality of stator units in this embodiment can also reduce the production of the stator core. Waste materials, thereby reducing the overall production cost.

As shown in FIG. 3, the first fixing member 13 is disposed on the side of the stator structure 12 away from the fixing base 11. The first fixing member 13 has a third through hole h3 corresponding to the first through hole h1, and the first fixing member 13 There is a fourth through hole h4 corresponding to the second through hole h2. Here, the first fixing member 13 has a plurality of third through holes h3 (one-to-one correspondence) each corresponding to the first through holes h1, and has a plurality of fourth through holes h4 each corresponding to the second through holes h2 (One to one correspondence). In addition, the second fixing member 16 is disposed on a side of the stator structure 12 away from the first fixing member 13, the second fixing member 16 has a fifth through hole h5 corresponding to the first through hole h1, and the second fixing member 16 is more There is one sixth through hole h6 corresponding to the second through hole h2. Here, the second fixing member 16 has a plurality of fifth through holes h5 (one-to-one correspondence) each corresponding to the first through holes h1, and has a plurality of sixth through holes h6 each corresponding to the second through holes h2 (One to one correspondence). In this embodiment, the first fixing member 13 and the second fixing member 16 are both an annular body, and are correspondingly disposed on the upper side and the lower side of the stator structure 12, and are adjacent to the arc-shaped bodies 1211 for fixing Stator structure 12. In some embodiments, the second fixing member 16 and the fixing base 11 may be integrally formed into a single component.

The positioning member 14 is arranged in the third through hole h3 of the first fixing member 13 and the corresponding first through hole h1 of the first stator unit 121; the locking member 15 is arranged in the fourth through hole h4 of the first fixing member 13 and corresponding The second through hole h2 of the second stator unit 122 is fixed to the fixing base 11. In this embodiment, the positioning member 14 and the locking member 15 are different components. Here, the positioning member 14 and the locking member 15 are different types or types of components. Among them, the positioning member 14 is, for example, but not limited to, a pin, and the locking member 15 is, for example, but not limited to, a screw or a bolt. As shown in FIG. 3, the first through hole through which the positioning member 14 passes is marked as h1, the third through hole is marked as h3, the fifth through hole is marked as h5, and the fourth through hole through which the fastener 15 passes is marked as h4. The second through hole is denoted as h2, and the sixth through hole is denoted as h6.

The number of the positioning member 14 and the locking member 15 in this embodiment is 12 in total, making the first The total number of one through hole h1 and the second through hole h2, the total number of the third through hole h3 and the fourth through hole h4, and the total number of the fifth through hole h5 and the sixth through hole h6 are 12 respectively. In addition, the number of the locking members 15 may be less than or equal to the positioning member 14. As shown in Figure 3, this embodiment includes 8 positioning members 14 (corresponding to 8 first through holes h1, 8 third through holes h3 and 8 fifth through holes h5) and 4 locking members 15 ( There are 4 second through holes h2, 4 fourth through holes h4, and 4 sixth through holes h6), but it is not limited to this. In different embodiments, the locking members 15 may be two, for example , 3, or 6 (the rest are positioning parts 14). Generally speaking, the price of the locking member 15 (screw or bolt) is higher, and the price of the positioning member 14 (bolt) is lower. Therefore, using fewer locking members 15 and more positioning members 14 can also reduce the overall cost. cost.

The fixing base 11 has seventh through holes h7 respectively corresponding to the fifth through holes h5, and the fixing base 11 further has eighth through holes h8 respectively corresponding to the sixth through holes h6. Among these positioning elements 14, at least two positioning elements 14 have different lengths. Specifically, it is not necessary that all the positioning members 14 pass through the third through hole h3, the first through hole h1, and pass through the fifth through hole h5 of the second fixing member 16, and then be inserted into the corresponding seventh through hole h5 of the fixing seat 11. As long as there is at least one through hole h7, or for example, two (or four) longer positioning members 14 are inserted into the seventh through hole h7 of the fixing base 11, there is a positioning function during the assembly process, making the assembly possible It is easier, and other shorter positioning members 14 only need to pass through the third through hole h3, the first through hole h1 and be inserted into the fifth through hole h5 of the second fixing member 16 (there is no need to insert the corresponding first through hole h5 of the fixing seat 11). Seven through holes h7). Of course, in different embodiments, all the positioning members 14 may be inserted into the seventh through hole h7 corresponding to the fixing base 11. In addition, the number of the locking members 15 in this embodiment is 4, and all the 4 locking members 15 pass through the fourth through hole h4, the second through hole h2, and the sixth through hole h6 corresponding to the second fixing member 16, and Lock into the eighth through hole h8 corresponding to the fixing base 11 to sequentially lock the first fixing member 13, the stator units and the second fixing member 16 on the fixing base 11 through the locking member 15 (Figure 4) .

In some embodiments, the materials of the first fixing member 13, the second fixing member 16, the positioning member 14 and the locking member 15 may be metal or plastic, or other materials with a certain structural strength. In some embodiments, in order to allow the positioning member 14 (plug) to pass through, the cross-sectional shape of the third through hole h3, the first through hole h1, the fifth through hole h5, and the seventh through hole h7 into which the positioning member 14 is inserted may be It is circular or polygonal (for example, triangle, quadrilateral,...). In order to allow the fastener 15 (screw or bolt) to pass through, the cross-sectional shape of the fourth through hole h4, the second through hole h2, the sixth through hole h6 and the eighth through hole h8 into which the fastener 15 is inserted may be circular. In addition, if the cross-sectional shape of the positioning member 14 and the locking member 15 are different, for example, the positioning member 14 When the cross-sectional shape of the locking member 15 is round, the third through hole h3, the first through hole h1, and the fifth through hole h5 through which the positioning member 14 passes, and the second through hole h5 through which the locking member 15 passes The cross-sectional shapes of the four through holes h4, the second through holes h2, and the sixth through holes h6 are different. In other words, if the cross-sectional shape of the positioning member 14 and the locking member 15 are different, the cross-sectional shape of the third through hole h3 and the fourth through hole h4 are different, and the cross-sectional shape of the first through hole h1 and the second through hole h2 are different. And the cross-sectional shapes of the fifth through hole h5 and the sixth through hole h6 are also different.

As shown in FIG. 5, the outer rotor motor further includes a plurality of coils 17, and each coil 17 is correspondingly wound on each stator unit. In addition, as shown in FIG. 6, the rotor motor 1 outside this embodiment may further include a rotor structure 18, and the rotor structure 18 is sleeved on the stator structure 12 and arranged corresponding to the stator structure 12. The rotor structure 18 of this embodiment has a rotating shaft 181, a housing 182 and a magnetic body 183. The rotor structure 18 is arranged on the stator structure 12 through the rotating shaft 181 and is arranged corresponding to the stator structure 12. The material of the shaft 181 can be a magnetic material or a non-magnetic material, and is not limited. The housing 182 is respectively connected to the rotating shaft 181 and the magnetic body 183, and is arranged on the stator structure 12, and the magnetic body 183 is arranged on the side of the housing 182 facing the stator structure 12, and the housing 182 can be embedded, clamped or bonded to the rotating shaft 181 links are not limited. The magnetic body 183 may be, for example, a permanent magnet, and is disposed on the inner wall of the housing 182 and faces the stator structure 12 and is disposed corresponding to the stator structure 12. The material of the magnetic body 183 may include, for example, ferrite, or ferrite soft magnetic, or magnetically permeable high alloy, or permeable material, or a combination thereof, and it is not limited here.

Therefore, when the coil 17 on the stator structure 12 of the outer rotor motor 1 is energized to generate a magnetic field, an electromagnetic effect can be generated with the magnetic body 183 of the rotor structure 18, thereby driving the rotor structure 18 to rotate.

It is also mentioned that the rotor motor 1 outside the embodiment of FIG. 6 can be applied to, for example, but not limited to, electric bicycles, electric trolleys, electric golf carts, or electric water vehicles (such as water electric pedal boats, such as swan boats). ), the present invention is not limited.

In some embodiments, the method for assembling the outer rotor motor 1 may include the following steps: firstly, winding the stator units separately to obtain a plurality of stator units with coils 17, and then assembling the stator units to The combined stator structure 12 is obtained, and then the coils 17 on the stator units are connected according to the requirements of the motor speed (for example, the speed of the 4-pole motor is 1800RPM), and then at least one positioning member 14 is used to pass through the first The third through hole h3 of a fixing member 13, the stator junction The first through hole h1 of the structure 12 and the fifth through hole h5 of the second fixing member 16 are assembled and positioned, and then at least one locking member 15 is used to sequentially pass through the fourth through hole h4 of the first fixing member 13 and The second through hole h2 of the stator structure 12 and the sixth through hole h6 of the second fixing member 16 are formed, and finally, they are arranged corresponding to the rotor structure 18 to assemble the outer rotor motor 1.

In conclusion, in the rotor motor 1 and its assembling method outside of this embodiment, since each stator unit can be wound first, then the stator structure 12 can be assembled through the first fixing member 13, the positioning member 14 and the locking member 15. Therefore, the winding is not limited to the size of the stator structure 12. In other words, even for a small motor, since each stator unit is separately wound, the winding difficulty is not high, so that the outer rotor motor 1 has the advantage of easy winding. In addition, since the positioning member 14 is used for positioning first, and then the locking member 15 is used to assemble the stator structure 12, the outer rotor motor 1 also has the feature of easy assembly. In addition, since the positioning member 14 (plug) is used for assembly in this embodiment, it also has a lighter weight and lower cost compared to all use of locking members (such as screws or bolts) for assembly. Advantages (because the weight and cost of bolts are lower than screws or bolts).

Please refer to FIG. 7, which is a partially exploded schematic diagram of an outer rotor motor according to another embodiment of the present invention. This embodiment is substantially the same as the rotor motor 1 (please refer to FIG. 3) other than the above embodiment. The main difference from the outer rotor motor 1 is that in addition to the fifth through hole h5 and the sixth through hole h6, the second fixing member 16a of this embodiment has a protrusion 161 on the inner side, and the protrusion 161 is disposed on the stator Inside the through portion H of the structure 12 (please refer to FIG. 1). The protruding portion 161 of this embodiment is annular and protrudes toward the through portion H, is disposed in the through portion H, and contacts the stator units. Here, due to process tolerances and assembly errors may cause noise and vibration when the outer rotor motor is running, this embodiment uses the second fixing member 16 to have a protruding portion 161, and the protruding portion 161 is disposed in the through portion H to contact the stator The design of the arc-shaped body 1211 of the unit can achieve the purpose of shaping to make the assembly of the stator structure 12 more convenient, and can also reduce the noise and vibration of the outer rotor motor during operation.

In addition, the total of the positioning member 14 and the locking member 15 of the embodiment in FIG. 7 is the same as the above embodiment (12 in total), but there are 9 positioning members 14 and 3 locking members 15 in this embodiment. The examples are different (the number and position of the corresponding through holes are also different from the previous examples).

In summary, in the rotor motor and its assembling method outside of the present invention, the stator structure can be assembled through the first fixing member, positioning member and locking member after winding each stator unit. Assembling, therefore, the winding is not limited to the size of the stator structure. Even for a small motor, since each stator unit can be individually wound, the winding difficulty is not high, so that the rotor motor outside the present invention has the advantage of easy winding.

In an embodiment, by the design that the second fixing member has a protruding part, and the protruding part is arranged in the through part of the stator structure and contacts the stator units, the purpose of shaping and making the assembly of the stator structure more convenient can be achieved. And it can also reduce the noise and vibration when the outer rotor motor is running.

The above description is only illustrative, and not restrictive. Any equivalent modifications or alterations that do not depart from the spirit and scope of the present invention should be included in the scope of the attached patent application.

11: Fixed seat 12: Stator structure 121: The first stator unit 122: The second stator unit 13: The first fixing part 14: Positioning parts 15: Lock the firmware 16: The second fixing part h1: the first through hole h2: second through hole h3: third through hole h4: fourth through hole h5: fifth through hole h6: sixth through hole h7: seventh through hole h8: Eighth through hole

Claims (8)

An external rotor motor includes: a stator structure, which is formed by a plurality of stator units assembled in pairs. The stator units include a first stator unit and a second stator unit. The first stator unit has A first through hole, the second stator unit has a second through hole; a first fixing member disposed on the stator structure, the first fixing member having a third through hole corresponding to the first through hole, The first fixing member further has a fourth through hole corresponding to the second through hole; a positioning member is disposed on the third through hole of the first fixing member and the first through hole of the first stator unit A locking member, provided in the fourth through hole of the first fixing member and the second through hole of the second stator unit; a second fixing member, provided in a stator structure away from the first fixing member Side, the second fixing member has a fifth through hole corresponding to the first through hole, the positioning member is further disposed in the fifth through hole; and a fixing seat on which the stator structure is disposed, and The locking member is locked to the fixing base. As described in item 1 of the patent application, the first stator unit has an arc-shaped body, the arc-shaped body has a first side and a second side opposite to each other, and the first side has a The convex part, the second side surface has a groove part, and the convex part of the first stator unit is arranged in cooperation with the groove part of the adjacent stator unit. For example, the outer rotor motor described in item 1 of the scope of patent application, wherein the number of the positioning members is multiple, and the lengths of the two positioning members are different. For example, the outer rotor motor described in item 1 of the scope of patent application, wherein the positioning member and the locking member are different components. As described in the first item of the scope of patent application, the cross-sectional shape of the first through hole is different from that of the second through hole; the cross-sectional shape of the third through hole is different from that of the fourth through hole. As described in item 1 of the scope of patent application, the second fixing member further has a sixth through hole corresponding to the second through hole, and the locking member is further arranged in the sixth through hole and is locked Fixed to the fixed seat. As described in the first item of the scope of patent application, the second fixing member further has a protruding part, the stator structure has a through part, and the protruding part is arranged in the through part and contacts the stator units. An assembling method of an outer rotor motor includes: winding a plurality of stator units respectively to obtain the stator units with a plurality of coils; assembling the stator units to obtain a certain substructure; connecting the stator units The coils; using at least one positioning member to sequentially pass through a first fixing member, the stator structure and a second fixing member; using at least one locking member to sequentially pass through the first fixing member, the stator structure and the second fixing member Two fixing parts are locked to a fixing seat; and the stator units are correspondingly arranged with a rotor structure.

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