JP2009295340A - Shielded connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shielded connector with shielding performance improved and with a simplified structure. <P>SOLUTION: A connector connecting part 35 for connecting with a counterpart shielded connector 50 is set in protrusion outside from an inverter cover 31 with conductivity, integrally molded with the cover 31. With the counterpart shielded connector 50 while being connected with the connector connecting part 35, a shielding part S and the connector connecting part 35 are conductively connected. Inside the inverter cover 31, an insulating member 37 holding a metal terminal 36 is fixed while being inserted into the connector connecting part 35 so that the metal terminal 36 is exposed inside the connector connecting part 35. Further, the inverter cover 31 is to be a grounding part conductively connected with the shielding part S through the connector connecting part 35. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a device-side shield connector to which a counterpart shield connector having a shield portion is connected.

  An electric compressor mounted on an electric vehicle or the like may malfunction due to, for example, the influence of noise generated from the outside of the inverter and cannot be operated normally. Therefore, in an electric vehicle or the like, a shield connector connected to a shielded electric wire is provided in the electric compressor in order to suppress the inverter from being affected by noise generated from the outside. An example of such a shield connector is described in Patent Document 1. In the shielded connector of Patent Document 1, a substantially rectangular connector housing made of insulating resin is fixed to a connector mounting portion (device case) of an in-vehicle electric device by a screw member. The connector mounting portion is a structural material such as a vehicle body frame formed of a conductive material, and the surface is a ground surface that is electrically connected to the shield portion of the shielded electric wire (the shield portion of the shield connector on the other side).

  The connector housing includes a shielded wire boss for connecting to the shielded wire. The shield wire boss has a substantially cylindrical inner tube portion that accommodates a female connection terminal connected to a metal terminal in the device, and a gap through which the cylindrical portion of the metal shell is inserted around the inner tube portion. It consists of the outer cylinder part which divides and forms. The metal shell is formed by press-molding a metal plate with a cylindrical portion that is conductively connected to the shield portion of the shielded electric wire and a ground connection flange that protrudes from the base end of the cylindrical portion in the outer diameter direction. . A screw insertion hole through which the screw member is inserted is formed in the ground connection flange. The inner diameter of the screw insertion hole is set larger than the outer diameter of the screw member, and a flanged cylindrical collar is fitted and mounted between the inner diameter of the screw insertion hole and the outer diameter of the screw member. When the screw member is inserted through the screw insertion hole, the collar collar comes into contact with the inside of the head of the screw member, and the collar is pressed toward the connector mounting portion. The ground connection flange is pressed against the ground surface of the connector mounting portion via the collar by being fastened by a screw member between the connector housing and the connector mounting portion.

When the shielded wire is connected to the boss for shielded wire, the shielded portion of the shielded wire and the cylindrical portion of the metal shell are connected to each other, and noise flowing into the shielded wire from the outside passes through the shield for grounding from the shielded portion. It flows to the connector mounting part. As a result, noise is prevented from flowing into the device side.
JP 2002-31453 A

  However, in the shielded connector disclosed in Patent Document 1, it is necessary to provide a ground connection flange in order to electrically connect the shield portion and the connector attachment portion, and the ground connection flange portion is provided between the connector housing and the connector attachment portion. A screw member for tightening together is required. Furthermore, a collar that presses the ground connection flange against the ground surface of the connector mounting portion is required to ensure that the ground connection flange is in contact with the ground surface of the connector mounting portion. For this reason, the number of parts in a shield connector increases, and the structure of a shield connector will be complicated. In addition, since it is necessary to flow noise from the shield part to the connector attachment part via the ground connection flange in order to flow the noise flowing into the shielded wire to the connector attachment part, only the amount via the ground connection collar part is required. The contact resistance at the time of flowing noise to the connector mounting portion increases, and the shielding performance decreases.

  The objective of this invention is providing the shield connector which can improve the shielding performance and can simplify the structure of a shield connector.

  In order to achieve the above object, the invention according to claim 1 is a shield connector on a device side to which a shield connector on the other side having a shield portion is connected, and the conductive device case in the device includes: A connector connecting portion connectable with the mating shield connector protrudes outward from the device case, the connector connecting portion is formed integrally with the device case, and the mating shield connector is connected to the connector connecting portion. An insulating member that holds a metal terminal connected to a connection terminal of the counterpart shield connector is provided inside the device case inside the connector connection part. The metal terminal is fixed in a state where it is inserted into the connector connecting portion so that the metal terminal is exposed, and the device case further includes the connector. And summarized in that it has a ground portion for conductively connected to the shield portion via the connection portion.

  According to this invention, when the shield connector on the other side is connected to the connector connection portion, the shield case and the connector connection portion come into contact with each other, so that the device case and the shield portion are electrically connected via the connector connection portion. Is done. Therefore, the noise emitted from the outside can be flowed from the shield part of the shield connector of the other party to the connector connection part and from the connector connection part to the device case, and the noise is prevented from flowing into the circuit in the device case. be able to. Therefore, compared with the case where the device case and the shield portion are conductively connected via another component, the contact resistance when noise flows to the device case is reduced, and the shield performance is improved. Further, the shield connector of Patent Document 1 requires another member in order to cause noise to flow from the shield portion to the connector mounting portion. However, according to the present invention, in order to flow noise from the shield part to the device case, it is only necessary to bring the shield part into contact with the connector connection part. As a structure of the shield connector, the metal terminal is arranged in the connector connection part. Therefore, it is only necessary to insert and fix the insulating member holding the metal terminal into the connector connecting portion from the inside of the device case. Therefore, the number of parts in the shield connector is reduced and the structure of the shield connector can be simplified as compared with the case where the device case and the shield part are conductively connected via another part.

  The invention according to claim 2 is the gist of the invention according to claim 1, wherein the insulating member is provided with a ferrite core so as to cover a part of the metal terminal over the entire circumference. To do.

  According to this invention, the insulating member is provided with the ferrite core so as to cover a part of the metal terminal over the entire circumference, so that the connection terminal and the metal terminal are connected, for example, Even if noise from the outside flows into the connection terminal and the noise flows into the metal terminal, the noise can be removed by the ferrite core. Therefore, it is possible to prevent the noise that flows from the connection terminal to the metal terminal from flowing into the circuit in the device case, etc., and to prevent the device from malfunctioning due to external noise. Can do. For example, even if noise flows into the metal terminal from a circuit or the like in the device case, the noise that flows into the metal terminal can be removed by the ferrite core. Therefore, it can prevent that the noise which flowed into the metal terminal flows into the shield connector side of the other party.

  According to this invention, the shield performance can be improved and the structure of the shield connector can be simplified.

Hereinafter, an embodiment in which the present invention is embodied in an electric compressor mounted on an electric vehicle will be described with reference to FIGS. FIG. 1 shows a longitudinal sectional view of an electric compressor 10 of the present embodiment.
As shown in FIG. 1, the electric compressor 10 is fixed to an engine (not shown) with bolts (not shown). A housing as a device case of the electric compressor 10 includes a motor housing 12 and a discharge housing 13, and a discharge chamber 15 is defined between the motor housing 12 and the discharge housing 13. A discharge port 16 is formed on the end wall of the discharge housing 13. The discharge port 16 is connected to an external refrigerant circuit (not shown). A suction port 17 is formed on the end wall of the motor housing 12. The suction port 17 is connected to an external refrigerant circuit (not shown). In the motor housing 12, a compression unit 18 for compressing the refrigerant and an electric motor 19 for driving the compression unit 18 are accommodated.

  First, the compression unit 18 will be described. The compression unit 18 includes a fixed scroll 20 fixed in the motor housing 12 and a movable scroll 21 disposed to face the fixed scroll 20. A compression chamber 22 whose volume can be changed is defined between the fixed scroll 20 and the movable scroll 21. A rotating shaft 23 is accommodated in the motor housing 12. The rotating shaft 23 is rotatably supported by the motor housing 12.

  Next, the electric motor 19 will be described. A rotor 24 (rotor) and a stator 25 (stator) are provided in the motor housing 12. In the motor housing 12, the rotor 24 is fixed to the outer periphery of the rotary shaft 23 so as to rotate integrally with the rotary shaft 23. The rotor 24 includes a rotor core 241 fixed to the rotary shaft 23 and a plurality of permanent magnets 242 provided on the peripheral surface of the rotor core 241. The stator 25 has a substantially annular shape as a whole. The stator 25 is configured by winding a coil 26 around teeth (not shown) of a stator core 251 fixed to the inner peripheral surface of the motor housing 12.

  On the outer peripheral surface 121 of the motor housing 12, an inverter cover 31 made of aluminum and having a box shape with one surface open is fixed. The inverter cover 31 constitutes a part of the device case. In a state where the inverter cover 31 is fixed to the outer peripheral surface 121 of the motor housing 12, a part of the outer peripheral surface 121 of the motor housing 12 is the bottom surface of the inverter cover 31. Therefore, a space is defined by a part of the outer peripheral surface 121 and the inverter cover 31, and an inverter 30 (shown by a two-dot chain line) as a device for driving the electric motor 19 is accommodated in the space. The inverter 30 is electrically connected to the stator 25 of the electric motor 19 by a lead wire (not shown).

  In the electric compressor 10 having the above configuration, when electric power is supplied from the inverter 30 to the electric motor 19, the rotating shaft 23 is rotated together with the rotor 24. Then, in the compression unit 18, the volume of the compression chamber 22 between the movable scroll 21 and the fixed scroll 20 is reduced. Then, the refrigerant is sucked into the motor housing 12 from the external refrigerant circuit via the suction port 17. The refrigerant sucked into the motor housing 12 is sucked into the compression chamber 22 via the suction passage 27 and is compressed in the compression chamber 22. The refrigerant compressed in the compression chamber 22 pushes the discharge valve 29 away from the discharge passage 28 formed in the fixed scroll 20 and is discharged into the discharge chamber 15. The refrigerant in the discharge chamber 15 flows out to the external refrigerant circuit via the discharge port 16 and returns to the motor housing 12.

  As shown in FIG. 2, a shield connector 40 on the device side is provided on the upper wall 31a of the inverter cover 31, and this shield connector 40 on the device side is a connector connection that can be connected to a shield connector 50 on the other side described later. A portion 35 is provided. The connector connecting portion 35 is provided so as to protrude from the upper wall 31a to the outside of the inverter cover 31 along a direction orthogonal to the axial direction of the electric compressor 10 (the axial direction of the rotary shaft 23). The connector connecting portion 35 is integrally formed with the inverter cover 31 and has conductivity.

  The connector connecting portion 35 has a cylindrical shape and is formed with a communication hole 35 a that communicates the inside and outside of the inverter cover 31. In the communication hole 35a, the inside of the inverter cover 31 in the communication hole 35a is a small diameter part 35b, and the outside of the inverter cover 31 is a large diameter part 35c larger in diameter than the small diameter part 35b than the small diameter part 35b.

  An insulating member 37 constituting a shield connector 40 on the device side is fixed inside the inverter cover 31. The insulating member 37 includes a connecting collar portion 37c. An insertion hole 37d through which the bolt B is inserted is formed in the connecting collar portion 37c. The insulating member 37 includes a terminal holding portion 37a that protrudes in a direction orthogonal to the direction in which the connecting collar portion 37c is projected. The terminal holding part 37a has an outer shape that can be fitted into the small diameter part 35b in the communication hole 35a, and a fitting concave part 37b is provided in the center of the tip of the terminal holding part 37a.

  A part of the metal terminal 36 in the length direction is held by the terminal holding portion 37a, and the tip of the metal terminal 36 is exposed in the fitting recess 37b. The base end portion of the metal terminal 36 is electrically connected to the inverter 30 by a wiring R (shown in FIG. 1). As shown in FIG. 3, the metal terminal 36 includes a tab-like plus terminal 36a and a minus terminal 36b. The plus terminal 36a and the minus terminal 36b are provided with a ferrite core 41 so as to cover a part of each terminal 36a, 36b in the length direction over the entire circumference. The ferrite core 41 absorbs noise energy (magnetic field) generated by the flow of noise from the plus terminal 36a to the minus terminal 36b by the magnetization of the ferrite core 41, and converts the absorbed noise energy into heat, thereby generating noise. Remove.

  The insulating member 37 is manufactured by placing the metal terminal 36 with the ferrite core 41 wound around the mold of the insulating member 37, pouring molten resin into the mold of the insulating member 37, and cooling. As shown in FIG. 2, the insulating member 37 is inserted into the small diameter portion 35 b with the terminal holding portion 37 a from the inside of the inverter cover 31 to be fitted, and the bolt B is inserted into the insertion hole 37 d to connect the insulating member 37. The part 37 c and the inverter cover 31 are fastened together, so that they are fixed inside the inverter cover 31. In a state where the insulating member 37 is fixed in the inverter cover 31, the insulating member 37 is interposed between the metal terminal 36 and the connector connecting portion 35, and the metal terminal 36 is insulated by the insulating member 37. The tip of the metal terminal 36 is exposed in the connector connecting portion 35.

  Next, the mating shield connector 50 will be described with reference to FIG. The lower side in FIG. 4 is the distal end side of the mating shield connector 50, and the upper side in FIG. 4 is the proximal end side of the mating shield connector 50. As shown in FIG. 4, the shield connector 50 on the other side has a connector housing 51 made of a synthetic resin, and the connector housing 51 includes an inner cylinder portion 51a that accommodates the connection terminals 53, and an inner cylinder portion 51a. It is comprised from the outer side cylinder part 51b which surrounds the front end side of this from the outside. The inner cylinder portion 51 a has an inner portion 511 for accommodating the connection terminal 53 on the distal end side, and an outer portion 512 formed so as to surround a part of the inner portion 511 on the proximal end side.

  Two connection terminals 53 are accommodated in the inner portion 511 in a state in which two connection terminals 53 are arranged. One end portion of each connection terminal 53 becomes a terminal connection portion 53 a connected to the metal terminal 36, and the other end portion is connected to the wiring 52 drawn out from the connector housing 51 to the outside. As shown in FIG. 4, a part of the wiring 52 is broken, and the wiring 52 is provided with a conductive wire 52a in the center, and in order to the outside of the conductive wire 52a, an insulated inner covered wire 52b and a conductive material. Each of the shielded wire 52c and the outer covered wire 52d is disposed concentrically. At the end of the wiring 52, a part of the outer covered wire 52d is peeled off, and a part of the shield wire 52c is exposed. A conductive member 54 is connected to the exposed portion of the shield wire 52c. The conducting member 54 is formed of a conductive metal, and is formed in a stepped cylindrical shape having a small diameter portion 54a on the distal end side and a large diameter portion 54b on the proximal end side. The conductive member 54 is fixed to the exposed portion of the shield wire 52c by caulking the small diameter portion 54a of the conductive member 54 to the exposed portion of the shield wire 52c.

  An insertion hole H is provided between the outer peripheral surface of the inner portion 511 and the inner peripheral surface of the outer portion 512 and between the inner peripheral surface of the outer portion 512 and the conductive member 54. A shield shell 55 is provided which is formed by bending a conductive metal plate into a cylindrical shape. The shield shell 55 is composed of a contact piece 55a whose front end side is formed in a straight line and an elastic contact piece 55b bent in a mountain shape on its base end side inward. The shield shell 55 is assembled by being inserted into the insertion hole H from the proximal end side of the connector housing 51. The contact piece 55a of the shield shell 55 is mounted between the outer peripheral surface of the inner portion 511 and the inner peripheral surface of the outer portion 512, and the distal end portion of the contact piece 55a is exposed in close contact with the outer peripheral surface of the inner portion 511. To do. The elastic contact piece 55b of the shield shell 55 is mounted between the inner peripheral surface of the outer portion 512 and the conductive member 54, and the elastic contact piece 55b elastically contacts the outer peripheral surface of the large diameter portion 54b of the conductive member 54. It is provided as possible. The shield wire 52c, the conductive member 54, and the shield shell 55 constitute a shield portion S provided in the mating shield connector 50.

  A rubber plug 56 is disposed in the outer portion 512 on the proximal end side with respect to the shield shell 55. The rubber plug 56 collectively seals between the two wires 52 and the outer portion 512. A packing 57 is fitted on the outer surface of the front end portion of the outer portion 512.

  As shown in FIG. 5, in the shield connector 40 on the device side and the shield connector 50 on the other side configured as described above, the inner portion 511 is fitted inside the fitting recess 37b, and the metal terminal 36 is provided. Is connected to the connection terminal 53 via the terminal connection portion 53a. When the connector connecting portion 35 and the connector housing 51 are fitted, the inner surface of the large diameter portion 35c in the communication hole 35a and the packing 57 are in close contact with each other, and the space between the connector connecting portion 35 and the connector housing 51 is sealed. It has become. The tip of the contact piece 55a in the shield shell 55 is in contact with the entire circumference of a part of the inner peripheral surface in the length direction of the small diameter portion 35b in the communication hole 35a. The inverter cover 31 is a ground portion that is electrically connected to the shield portion S of the counterpart shield connector 50, and the tip end portion of the contact piece 55a is the inner peripheral surface in the length direction of the small diameter portion 35b (connector connection portion 35). The inverter cover 31 and the shield part S are conductively connected via the connector connection part 35 by contacting over the entire circumference of a part of the inverter cover 31.

  Now, in a state where the counterpart shield connector 50 is connected to the equipment shield connector 40, for example, noise emitted from the outside may flow into the counterpart shield connector 50 side. However, the noise that flows into the shield connector 50 on the mating side flows into the connector connecting portion 35 via the shield wire 52c, the conductive member 54, and the shield shell 55, is transmitted to the inverter cover 31, and is grounded from the housing to the engine. The Further, for example, noise from the outside flows into the connection terminal 53 and the noise flows into the metal terminal 36, but the noise is removed by the ferrite core 41. Further, for example, noise may flow into the metal terminal 36 from the inverter 30 side, but the noise flowing into the metal terminal 36 is removed by the ferrite core 41.

In the above embodiment, the following effects can be obtained.
(1) The connector connecting portion 35 is integrally formed with the inverter cover 31, and the inverter cover 31 and the housing are used as a ground portion. For this reason, when the connector connecting portion 35 and the shield portion S are conductively connected, noise is caused to flow from the shield portion S to the inverter cover 31 via the connector connecting portion 35 and further grounded from the housing to the engine. Can do. For this reason, in order to flow noise from the inverter cover 31 to the housing, the contact resistance when flowing noise to the inverter cover 31 is smaller than when the inverter cover 31 and the shield part S are connected to each other through another component. Reduced and shield performance improved. Further, the shield connector of Patent Document 1 requires another member in order to cause noise to flow from the shield portion to the connector mounting portion. However, according to this embodiment, in order to flow noise from the shield part S to the inverter cover 31, it is only necessary to bring the shield part S into contact with the connector connection part 35. Therefore, as a structure of the shield connector 40 on the device side, in order to arrange the metal terminal 36 in the connector connecting portion 35, the insulating member 37 holding the metal terminal 36 is inserted into the connector connecting portion 35 from the inside of the inverter cover 31. It only needs to be inserted and fixed. Therefore, the number of components in the shield connector 40 on the device side is reduced and the structure of the shield connector 40 on the device side is simplified as compared with the case where the inverter cover 31 and the shield portion S are conductively connected via another component. Can do.

  (2) Even if noise from the outside flows into the connection terminal 53 and the noise flows into the metal terminal 36, the noise can be removed by the ferrite core 41, and the noise that flows into the metal terminal 36 from the connection terminal 53. However, it can prevent flowing into the inverter 30 side. Therefore, it is possible to prevent the inverter 30 from malfunctioning due to external noise. Further, even if noise flows into the metal terminal 36 from the inverter 30 side, the noise flowing into the metal terminal 36 can be removed by the ferrite core 41, and the noise flowing into the metal terminal 36 is removed from the shield connector 50 side of the counterpart side. It can be prevented from flowing into the water.

  (3) By forming the connector connecting portion 35 integrally with the inverter cover 31, only by providing a packing 57 that seals between the connector connecting portion 35 and the connector housing 51, the shield connector 50 on the counterpart side and the shield connector on the device side are provided. 40 can be waterproof sealed. Therefore, as in the background art, a shielded wire boss projecting from the inside of the connector mounting portion, and the connector housing is mounted around the shielded wire boss, the inverter cover 31 has an inner portion. Can reduce the waterproof seal to.

  (4) Since the connector connecting portion 35 is integrally formed with the inverter cover 31, as compared with the shield connector configured by assembling the connector housing to the outer surface of the connector mounting portion as in the background art, the shield connector on the device side The connection portion of the connector 40 with the mating shield connector 50 is changed from resin to aluminum, and the strength is increased.

In the present embodiment, the following embodiments are also possible.
In the embodiment shown in FIG. 6, the connector connecting portion 35 is provided so as to protrude from the side wall 31 b of the inverter cover 31 to the outside of the inverter cover 31 along the axial direction of the electric compressor 10. In other words, the position where the connector connecting portion 35 is molded is not particularly limited. If the mating shield connector 50 and the connector connecting portion 35 can be joined to each other, the connector connecting portion 35 is located at any position on the inverter cover 31. You may shape | mold.

In addition, as in the embodiment shown in FIG. 6, the ferrite core 41 may not be provided on the entire circumference of a part of the metal terminal 36 in the length direction.
(Circle) the front-end | tip part of the contact piece 55a in the shield shell 55 may be comprised so that the outer peripheral surface of the connector connection part 35 may be contacted, for example.

  A convex portion is formed on the connecting collar portion 37c of the insulating member 37, and a concave portion is formed on the inner surface of the inverter cover 31, and the convex portion and the concave portion are fitted to each other. The insulating member 37 may be fixed inside the inverter cover 31 by caulking the cover 31.

  (Circle) the compression part 18 is not limited to the type comprised by the fixed scroll 20 and the movable scroll 21, For example, you may change into a piston type, a vane type, etc.

  ○ The present invention is not limited to a device-side shield connector applied to the electric compressor 10, but, for example, a connector connection portion is integrally formed in a device case having conductivity, and the other side having a shield portion As long as the shield connector is connected to the connector connecting portion, the connector can be anything as long as the connector connecting portion and the shield portion are brought into conductive connection.

The following technical idea (invention) can be understood from the embodiment.
(1) The insulating member has a connecting collar, a screw member is inserted into an insertion hole formed in the connecting collar, and the connecting collar and the device case are fastened together. The shield connector according to claim 1, wherein the insulating member is fixed inside the device case.

  (2) The insulating member has a connection flange, and a recess is formed on one of the connection flange and the inside of the device case, and a protrusion is formed on the other, The recessed part and the said convex part can be fitted, The said insulating member is being fixed inside the said apparatus case by the said recessed part and the said convex part being fitted, The said Claim 1 or Claim 2 is fixed. Shield connector.

  (3) The shield connector according to any one of claims 1 and 2, the technical idea (1), and the technical idea (2), wherein the device is an electric compressor.

The longitudinal cross-sectional view which shows the electric compressor of embodiment. The longitudinal cross-sectional view which shows the shield connector by the side of an apparatus. The perspective view which shows a metal terminal and a ferrite core. The longitudinal cross-sectional view which shows the shield connector of the other party. The longitudinal cross-sectional view which shows the state by which the shield connector of the apparatus side and the shield connector of the other party were connected. The longitudinal cross-sectional view which shows the shield connector by the side of the apparatus of another embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 12 ... Motor housing which comprises equipment case, 13 ... Discharge housing which comprises equipment case, 30 ... Inverter as equipment, 31 ... Inverter cover which comprises a part of equipment case, 35 ... Connector connection part, 36 ... Metal terminal 37 ... Insulating member, 40 ... Shield connector on the device side, 41 ... Ferrite core, 50 ... Shield connector on the other side, 52c ... Shield wire constituting the shield part, 53 ... Connection terminal, 54 ... Conductivity constituting the shield part 55, a shield shell constituting the shield part, S: a shield part.

Claims (2)

A shield connector on the device side to which a shield connector on the other side having a shield part is connected,
In the conductive device case in the device, a connector connection portion connectable to the shield connector on the other side protrudes outward from the device case, and the connector connection portion is formed integrally with the device case, The shield connector on the other side is connected to the shield part in a state of being connected to the connector connecting part,
Inside the device case, an insulating member holding a metal terminal connected to the connection terminal of the counterpart shield connector is inserted into the connector connection portion so that the metal terminal is exposed in the connector connection portion. Fixed in the state
Further, the device case is a shield connector, wherein the device case serves as a ground portion that is electrically connected to the shield portion via the connector connection portion.   The shield connector according to claim 1, wherein the insulating member is provided with a ferrite core so as to cover a part of the metal terminal over the entire circumference.

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