CN111527675B - Motor unit - Google Patents

Abstract

A motor unit according to one embodiment of the present invention includes: a motor; an inverter that supplies power to the motor; a bus bar having a 1 st extending portion extending in a prescribed direction, the bus bar connecting the motor and the inverter; a housing having a 1 st opening hole through which the 1 st extension part passes, the housing accommodating a motor; an inverter case having a 2 nd opening hole opposed to the 1 st opening hole in a predetermined direction and through which the 1 st extension portion passes, the inverter case housing an inverter; a bus bar support member which is disposed in the housing and supports the bus bar; a connecting member having a through hole through which the 1 st extending portion passes in a predetermined direction, the connecting member being disposed between the case and the inverter case in the predetermined direction; a 1 st seal portion disposed between the housing and the coupling member in a predetermined direction and in contact with the housing and the coupling member; and a 2 nd seal portion disposed between the coupling member and the inverter case in a predetermined direction and contacting the coupling member and the inverter case.

Description

Motor unit

Technical Field

The present invention relates to a motor unit.

Background

In the japanese patent gazette: 4546689 discloses a device for connecting the pole housing of an electric motor to the housing of control electronics.

Documents of the prior art

Patent document

Patent document 1: japanese patent gazette: japanese patent No. 4546689

Disclosure of Invention

Problems to be solved by the invention

In the case where the case housing the motor and the inverter case housing the inverter are fixed to each other, the following structure is considered: openings are provided in portions of the case facing the inverter case, and the bus bar is passed through each opening. In this structure, there is room for improvement in terms of ease of assembly and stability of sealing performance of each opening hole.

In view of the above problems, an object of the present invention is to provide a motor unit that is easy to assemble and has stable sealing properties of each opening hole.

Means for solving the problems

A motor unit according to one embodiment of the present invention includes: a motor; an inverter that supplies power to the motor; a bus bar having a 1 st extending portion extending in a prescribed direction, the bus bar connecting the motor and the inverter; a housing having a 1 st opening hole through which the 1 st extension passes, the housing accommodating the motor; an inverter case having a 2 nd opening hole opposed to the 1 st opening hole in the predetermined direction and through which the 1 st extension portion passes, the inverter case housing the inverter; a bus bar support member disposed in the housing and supporting the bus bar; a connecting member having a through hole through which the 1 st extending portion passes in the predetermined direction, the connecting member being disposed between the case and the inverter case in the predetermined direction; a 1 st seal portion disposed between the housing and the coupling member in the predetermined direction and in contact with the housing and the coupling member; and a 2 nd seal portion disposed between the coupling member and the inverter case in the predetermined direction and contacting the coupling member and the inverter case.

Effects of the invention

According to one embodiment of the present invention, a motor unit that is easy to assemble and has stable sealing performance of each opening hole is provided.

Drawings

Fig. 1 is a conceptual diagram of a motor unit according to an embodiment.

FIG. 2 is a side schematic view of a motor unit of one embodiment.

Fig. 3 is an enlarged sectional view of the section III of fig. 2, showing a cross section perpendicular to the motor axis.

Fig. 4 is a partial sectional view showing a modification of the motor unit according to the embodiment.

Detailed Description

Hereinafter, a motor unit according to an embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention.

In the following description, the direction of gravity is defined based on the positional relationship in the case where the motor unit 1 is mounted on a vehicle on a horizontal road surface. In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction represents the vertical direction (i.e., the up-down direction), + Z-direction is the upper side (the opposite side to the direction of gravity), and-Z-direction is the lower side (the direction of gravity). The X-axis direction is a direction perpendicular to the Z-axis direction, and indicates the front-rear direction of the vehicle on which the motor unit 1 is mounted, + X direction is the front of the vehicle, and-X direction is the rear of the vehicle. However, the + X direction may be the vehicle rear direction and the-X direction may be the vehicle front direction. The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction, and indicates the width direction (left-right direction) of the vehicle, the + Y direction is the vehicle left direction, and the-Y direction is the vehicle right direction. However, when the + X direction is the vehicle rear direction, the + Y direction may be the vehicle right direction and the-Y direction may be the vehicle left direction. That is, regardless of the direction of the X-axis, the + Y direction is one side of the vehicle in the right-left direction, and the-Y direction is the other side of the vehicle in the right-left direction.

In the following description, unless otherwise specified, a direction (Y-axis direction) parallel to the motor axis J2 of the motor 2 is simply referred to as "axial direction", a radial direction about the motor axis J2 is simply referred to as "radial direction", and a circumferential direction about the motor axis J2, that is, a direction about the motor axis J2 is simply referred to as "circumferential direction". However, the "parallel direction" also includes a substantially parallel direction.

Hereinafter, a motor unit (electric drive device) 1 according to an exemplary embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a conceptual diagram of a motor unit 1 according to an embodiment. Fig. 2 is a side view of the motor unit 1 as viewed from the side of the vehicle. Fig. 1 is a conceptual diagram, and the arrangement and size of each portion are not necessarily the same as those of the actual portion.

The motor unit 1 is mounted on a vehicle having a motor as a power source, such as a Hybrid Electric Vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an Electric Vehicle (EV), and is used as a power source for these vehicles.

As shown in fig. 1 to 3, the motor unit 1 of the present embodiment includes a motor (main motor) 2, a gear portion 3, a housing 6, an inverter 7, an inverter case 8, a bus bar 9, a bus bar support member 10, a coupling member 14, a screw member 15, a 1 st seal portion 11, a 2 nd seal portion 12, and a 3 rd seal portion 13. The motor axis J2 of the motor 2 extends in a direction perpendicular to a predetermined direction (X-axis direction in the example of the present embodiment) described later. The motor axis J2 extends in the Y-axis direction.

As shown in fig. 1, the motor 2 includes: a rotor 20 that rotates about a motor axis J2 extending in the horizontal direction; and a stator 30 located radially outside the rotor 20. The housing 6 is provided with a housing space 80 for housing the motor 2 and the gear portion 3. The housing space 80 is divided into a motor chamber 81 housing the motor 2 and a gear chamber 82 housing the gear portion 3.

< Motor >

The motor 2 is housed in a motor chamber 81 of the housing 6. The motor 2 has a rotor 20 and a stator 30 located radially outside the rotor 20. The motor 2 is an inner rotor type motor having a stator 30 and a rotor 20, and the rotor 20 is rotatably disposed inside the stator 30.

The rotor 20 is rotated by supplying electric power from a battery, not shown, to the stator 30 via the inverter 7. As shown in fig. 1 to 3, the rotor 20 includes a shaft (motor shaft) 21, a rotor core 24, and a rotor magnet (not shown). The rotor 20 (i.e., the shaft 21, the rotor core 24, and the rotor magnet) rotates about a motor axis J2 extending in the horizontal direction. The torque of the rotor 20 is transmitted to the gear portion 3.

The shaft 21 extends centering on a motor axis J2 extending in the horizontal direction and the width direction of the vehicle. The shaft 21 rotates about a motor axis J2. The shaft 21 is a hollow shaft having a hollow portion provided therein, the hollow portion having an inner peripheral surface extending along the motor axis J2.

The shaft 21 extends across a motor chamber 81 and a gear chamber 82 of the housing 6. One end of the shaft 21 protrudes toward the gear chamber 82 side. The 1 st gear 41 is fixed to an end of the shaft 21 projecting into the gear chamber 82.

The rotor core 24 is formed by laminating silicon steel plates. The rotor core 24 is a cylindrical body extending in the axial direction. A plurality of rotor magnets are fixed to the rotor core 24. The plurality of rotor magnets are arranged in a circumferential direction with magnetic poles alternating.

The stator 30 surrounds the rotor 20 from the radially outer side. In fig. 1, the stator 30 includes a stator core 32, a coil 31, and an insulator (not shown) interposed between the stator core 32 and the coil 31. The stator 30 is held by the housing 6. Although not shown, the stator core 32 has a plurality of magnetic pole teeth extending radially inward from the inner circumferential surface of the annular yoke. A coil wire (not shown) is wound between the magnetic pole teeth. The coil wire wound around the magnetic pole teeth constitutes the coil 31. The coil wire is connected to the inverter 7 via a bus bar 9. As shown in fig. 1, the coil 31 has a coil end 31a protruding from an axial end face of the stator core 32. The coil end 31a protrudes in the axial direction from the end of the rotor core 24 of the rotor 20. The coil end 31a protrudes to both axial sides with respect to the rotor core 24.

< gear part >

The gear portion 3 is housed in a gear chamber 82 of the housing 6. The gear portion 3 is connected to the shaft 21 on one axial side of the motor axis J2. The gear portion 3 has a reduction gear 4 and a differential gear 5. The torque output from the motor 2 is transmitted to the differential device 5 via the reduction gear device 4.

< reduction gear >

The reduction gear 4 is connected to the rotor 20 of the motor 2. The reduction gear 4 has the following functions: the rotation speed of the motor 2 is reduced, and the torque output from the motor 2 is increased according to the reduction ratio. The reduction gear 4 transmits the torque output from the motor 2 to the differential device 5.

The reduction gear unit 4 has a 1 st gear (intermediate drive gear) 41, a 2 nd gear (intermediate gear) 42, a 3 rd gear (final drive gear) 43, and an intermediate shaft 45. The torque output from the motor 2 is transmitted to a ring gear (gear) 51 of the differential device 5 via the shaft 21 of the motor 2, the 1 st gear 41, the 2 nd gear 42, the counter shaft 45, and the 3 rd gear 43. The gear ratio of each gear, the number of gears, and the like can be variously changed according to a required reduction ratio. The reduction gear 4 is a parallel shaft gear type reduction gear in which the shaft cores of the respective gears are arranged in parallel.

The 1 st gear 41 is provided on the outer peripheral surface of the shaft 21 of the motor 2. The 1 st gear 41 rotates together with the shaft 21 about the motor axis J2. The intermediate shaft 45 extends along an intermediate axis J4 that is parallel to the motor axis J2. The intermediate shaft 45 rotates about the intermediate axis J4. The 2 nd gear 42 and the 3 rd gear 43 are provided on the outer peripheral surface of the intermediate shaft 45. The 2 nd gear 42 and the 3 rd gear 43 are connected via an intermediate shaft 45. The 2 nd gear 42 and the 3 rd gear 43 rotate about the intermediate axis J4. The 2 nd gear 42 meshes with the 1 st gear 41. The 3 rd gear 43 meshes with the ring gear 51 of the differential device 5. The 3 rd gear 43 is located on the partition wall 61c side with respect to the 2 nd gear 42.

< differential device >

The differential device 5 is connected to the motor 2 via the reduction gear 4. The differential device 5 is a device for transmitting the torque output from the motor 2 to the wheels of the vehicle. The differential device 5 has the following functions: when the vehicle turns, the same torque is transmitted to the axles 55 of the left and right wheels while absorbing the speed difference between the left and right wheels. The differential device 5 includes a ring gear 51, a gear case (not shown), a pair of pinion gears (not shown), a pinion shaft (not shown), and a pair of side gears (not shown).

The ring gear 51 rotates about a differential axis J5 parallel to the motor axis J2. The torque output from the motor 2 is transmitted to the ring gear 51 via the reduction gear 4. That is, the ring gear 51 is connected to the motor 2 via another gear.

(arrangement of axes)

The motor axis J2, the intermediate axis J4, and the differential axis J5 extend parallel to each other in the horizontal direction. The intermediate axis J4 and the differential axis J5 are located on the lower side with respect to the motor axis J2. Therefore, the reduction gear 4 and the differential gear 5 are located below the motor 2.

As shown in fig. 2, when viewed from the axial direction of the motor axis J2, a segment virtually connecting the motor axis J2 and the intermediate axis J4 is referred to as a 1 st segment L1, a segment virtually connecting the intermediate axis J4 and the differential axis J5 is referred to as a 2 nd segment L2, and a segment virtually connecting the motor axis J2 and the differential axis J5 is referred to as a 3 rd segment L3.

The 2 nd line segment L2 extends in a substantially horizontal direction. That is, the intermediate axis J4 and the differential axis J5 are aligned in a substantially horizontal direction. In the present embodiment, the substantially horizontal direction of the 2 nd line segment L2 is a direction within ± 10 ° from the horizontal direction.

The angle α formed by the 2 nd line segment L2 and the 3 rd line segment L3 is 30 ° ± 5 °.

The 1 st line segment L1 extends in a substantially vertical direction. That is, the motor axis J2 and the intermediate axis J4 are aligned in the substantially vertical direction. In the present embodiment, the substantially vertical direction of the 1 st line segment L1 is a direction within ± 10 ° from the vertical direction.

The length L1 of the 1 st segment, the length L2 of the 2 nd segment, and the length L3 of the 3 rd segment satisfy the following relationship.

L1：L2：L3＝1：1.4～1.7：1.8～2.0

The reduction ratio from the motor 2 to the reduction mechanism of the differential device 5 is 8 or more and 11 or less. According to the present embodiment, a desired gear ratio (8 to 11) can be achieved while maintaining the positional relationship among the motor axis J2, the intermediate axis J4, and the differential axis J5 as described above.

< outer case >

The housing 6 is made of metal. Although not shown, the housing 6 is formed by combining a plurality of members. Alternatively, the housing 6 may be formed of a single member. As shown in fig. 1, the motor 2 and the gear portion 3 are housed in a housing space 80 provided inside the housing 6. The housing 6 holds the motor 2 and the gear portion 3 in the housing space 80. The housing 6 has a partition wall 61 c. The housing space 80 of the housing 6 is divided by a partition wall 61c into a motor chamber 81 and a gear chamber 82. The motor chamber 81 accommodates the motor 2. The gear chamber 82 houses the gear portion 3 (i.e., the reduction gear 4 and the differential gear 5).

An oil reservoir P in which the oil O is stored is provided in a lower region in the housing space 80. In the present embodiment, the bottom 81a of the motor chamber 81 is located above the bottom 82a of the gear chamber 82. Further, a partition wall opening 68 is provided in a partition wall 61c that partitions the motor chamber 81 and the gear chamber 82. The partition wall opening 68 communicates the motor chamber 81 with the gear chamber 82. The partition wall opening 68 moves the oil O stored in the lower region of the motor chamber 81 to the gear chamber 82. The partition wall 61c is provided with a through-insertion hole 61f through which the shaft 21 of the motor 2 is inserted, in addition to the partition wall opening 68 described above.

A part of the differential device 5 is immersed in the oil reservoir P. The oil O accumulated in the oil reservoir P is lifted by the operation of the differential device 5, and a part of the oil O is diffused into the gear chamber 82. The oil O diffused into the gear chamber 82 is supplied to the gears of the reduction gear 4 and the differential gear 5 in the gear chamber 82, and spreads over the tooth surfaces of the gears. The oil O used in the reduction gear 4 and the differential gear 5 drops and is collected by the oil reservoir P located below the gear chamber 82. The capacity of the oil reservoir P of the housing space 80 is such that a part of the bearings of the differential device 5 is immersed in the oil O when the motor unit 1 is stopped.

The oil O circulates in an oil passage (not shown) provided in the casing 6. The oil passage is a path of the oil O supplied from the oil reservoir P to the motor 2. The oil path supplies oil O to circulate and cool the motor 2.

The oil O is used for lubrication of the reduction gear 4 and the differential 5. In addition, the oil O is used for cooling the motor 2. The oil O is accumulated in a lower region (i.e., the oil reservoir P) in the gear chamber 82. Since the oil O functions as a lubricating oil and a cooling oil, it is preferable to use an oil equivalent to an Automatic Transmission lubricating oil (ATF) having a relatively low viscosity.

In fig. 1 and 2, the housing 6 has a motor housing portion 6a housing the motor 2 and a gear housing portion 6b housing the gear portion 3. That is, the motor 2 is housed in the housing 6. The motor housing portion 6a is cylindrical about a motor axis J2.

As shown in fig. 3, a wall portion 6e of the motor housing portion 6a facing the inverter case 8 is shaped like a plate extending perpendicular to the X axis. The motor housing 6a has a 1 st opening 6 c. The 1 st opening hole 6c is disposed in the wall portion 6e and opens in the X-axis direction. That is, the housing 6 has the 1 st opening hole 6 c. The 1 st opening hole 6c penetrates the motor housing portion 6a in the radial direction. The 1 st opening hole 6c penetrates the motor housing portion 6a in the X-axis direction.

Although not shown, the 1 st opening hole 6c is oblong when viewed from the X-axis direction. The 1 st opening hole 6c has an oblong circular shape extending in the Y axis direction. That is, the 1 st aperture 6c has a larger opening size in the Y axis direction than the opening size in the Z axis direction (inner diameter size) when viewed from the X axis direction.

As shown in fig. 2, the gear housing portion 6b has a protruding portion 6d that protrudes radially with respect to the motor housing portion 6a when viewed from the axial direction. In the present embodiment, the protruding portion 6d protrudes toward the vehicle rear side and the lower side with respect to the motor housing portion 6 a. The protruding portion 6d receives a part of the gear portion 3. More specifically, a part of the 2 nd gear 42, a part of the 3 rd gear 43, and a part of the ring gear 51 are housed inside the extension portion 6 d. The projecting portion 6d is provided with an axle passage hole 61 e. The axle passage hole 61e penetrates the projecting portion 6d in the Y-axis direction. As shown in fig. 1, the axle passage holes 61e are provided in a pair of wall portions located at both ends of the projecting portion 6d in the Y-axis direction, respectively. The axle 55 is inserted through the axle passage hole 61 e.

< inverter >

The inverter 7 is electrically connected to the motor 2. The inverter 7 supplies electric power to the motor 2. The inverter 7 supplies electric power to the stator 30 via the bus bar 9. The inverter 7 controls the current supplied to the motor 2. The inverter 7 has a circuit board and a capacitor.

< inverter case >

As shown in fig. 2, the inverter case 8 is a rectangular parallelepiped container. The inverter case 8 is made of metal. However, the inverter case 8 may be made of resin. The inverter case 8 houses an inverter 7. The inverter case 8 and the motor housing portion 6a are disposed adjacent to each other in the radial direction of the motor axis J2. The inverter case 8 is adjacent to the motor housing portion 6a in the horizontal direction. The inverter case 8 includes a case body 8d having a bottomed tubular shape and a lid portion 8e closing an upper opening of the case body 8 d.

The inverter case 8 has a brim 8a in a case body 8 d. The brim 8a protrudes in the X-axis direction from the upper end of the peripheral wall of the housing main body 8d, and has a plate shape extending in the Y-axis direction. The plate surface of the eaves 8a faces in the Z-axis direction. The brim 8a is provided with a screw hole (not shown) penetrating the brim 8a in the Z-axis direction. A screw member 6f is inserted into the screw hole. The screw member 6f is screwed into a screw hole (not shown) of the motor housing portion 6 a. The screw hole is provided in the ceiling wall of the motor housing portion 6a and opens upward. The screw member 6f is screwed in the Z-axis direction with respect to the housing 6. The inverter case 8 is fixed to the case 6 using a screw member 6 f. The inverter case 8 is fixed to the outer peripheral surface of the motor housing portion 6a facing radially outward.

As shown in fig. 3, a wall portion 8b of the peripheral wall of the housing main body 8d facing the motor housing portion 6a is plate-shaped and extends perpendicularly to the X axis.

The inverter case 8 has a 2 nd opening hole 8 c. The 2 nd opening hole 8c is disposed in the wall portion 8b of the housing main body 8d and opens in the X-axis direction. The 2 nd opening hole 8c penetrates the inverter case 8 in the radial direction. The 2 nd opening hole 8c penetrates the inverter case 8 in the X axis direction. The 2 nd opening 8c faces the 1 st opening 6c in a predetermined direction (X-axis direction in the present embodiment) described later.

Although not shown, the 2 nd opening hole 8c has an oblong shape when viewed from the X-axis direction. The 2 nd opening hole 8c has an oblong shape extending in the Y axis direction. That is, the opening size of the 2 nd opening 8c in the Y axis direction is larger than the opening size (inner diameter size) in the Z axis direction when viewed from the X axis direction. In the example of the present embodiment, the 2 nd opening hole 8c and the 1 st opening hole 6c have portions having the same shape as each other in a cross section perpendicular to the X axis. The shape of the 2 nd opening hole 8c and the shape of the 1 st opening hole 6c coincide with each other when viewed from the X-axis direction.

< bus bar >

The bus bar 9 connects the motor 2 and the inverter 7. The bus bar 9 electrically connects the stator 30 and the inverter 7. Although not shown, a plurality of bus bars 9 are provided. In the present embodiment, 3 bus bars 9 are provided. The phases of the currents flowing on the 3 bus bars 9 are different from each other. Each current flowing through the 3 bus bars 9 is U-phase, V-phase, or W-phase. The plate surface of the bus bar 9 faces the Z-axis direction. The plurality of bus bars 9 are arranged in a direction perpendicular to a predetermined direction (X-axis direction) described later. The plurality of bus bars 9 are arranged at intervals from each other in the Y-axis direction.

In fig. 3, the bus bar 9 has a 1 st extension part 9a, a 2 nd extension part 9b, and a 3 rd extension part (not shown). The 1 st extending portion 9a extends in a prescribed direction. In the present embodiment, the predetermined direction is the 1 st direction. Specifically, the predetermined direction is the X-axis direction. The direction from the 2 nd opening hole 8c toward the 1 st opening hole 6c in the 1 st direction is the 1 st direction side. The 1 st direction side is a predetermined direction side. Specifically, the 1 st direction side is the + X direction. The direction from the 1 st opening hole 6c toward the 2 nd opening hole 8c in the 1 st direction is the 1 st direction other side. The other side in the 1 st direction is the other side in the predetermined direction. Specifically, the other side of the 1 st direction is the-X direction.

The 1 st extension 9a passes through the 1 st open hole 6 c. The 1 st extension 9a extends throughout the inside and outside of the housing 6. The 1 st extending portion 9a extends through the 1 st opening hole 6c to extend inside and outside the motor housing portion 6 a. The 1 st extending portion 9a has a 1 st direction side end portion disposed on the 1 st direction side of the 1 st opening hole 6 c. The 1 st extending portion 9a has a 1 st direction side end portion located inside the housing 6.

The 1 st extension 9a passes through the 2 nd opening hole 8 c. The 1 st extension portion 9a extends throughout the inside and outside of the inverter case 8. The 1 st extending portion 9a has the other end in the 1 st direction disposed on the other side in the 1 st direction from the 2 nd opening hole 8 c. The 1 st extending portion 9a has its 1 st-direction other end portion located inside the inverter case 8.

The 2 nd extending portion 9b extends from the 1 st extending portion 9a in a direction intersecting with a predetermined direction (1 st direction) inside the housing 6. The 2 nd extending part 9b is connected to the 1 st direction side end part of the 1 st extending part 9 a. The 2 nd extending portion 9b extends from the 1 st extending portion 9a in a direction perpendicular to the 1 st direction. The 2 nd extending portion 9b extends in the 2 nd direction among the directions perpendicular to the 1 st direction. In the present embodiment, the 2 nd direction is the Z-axis direction. That is, the 2 nd extending portion 9b extends in the Z-axis direction. In the illustrated example, the 2 nd extending portion 9b extends from a connecting portion with the 1 st extending portion 9a toward an upper side. Among the plurality of bus bars 9, a bus bar 9 in which the 2 nd extending portion 9b extends toward the upper side from the connecting portion with the 1 st extending portion 9a and a bus bar 9 extending toward the lower side are included.

Although not shown, the 3 rd extending portion extends from the 2 nd extending portion 9b in a direction intersecting the 1 st direction and the 2 nd direction inside the housing 6. The 3 rd extending part is connected to the end of the 2 nd extending part 9b in the Y-axis direction. The 3 rd extending part extends from the 2 nd extending part 9b in a direction perpendicular to the 1 st and 2 nd directions. The 3 rd extending portion extends in a 3 rd direction perpendicular to the 1 st and 2 nd directions. In the present embodiment, the 3 rd direction is the Y axis direction. That is, the 3 rd extending portion extends in the Y-axis direction.

< bus bar support Member >

As shown in fig. 3, the bus bar support member 10 is disposed in the housing 6 and supports the bus bar 9. The bus bar support member 10 is made of resin. The bus bar support member 10 is insert-molded with a part of the resin of the 1 st extending portion 9a of the bus bar 9.

The bus bar support member 10 is provided with a 1 st projection 10 a. The 1 st projection 10a is inserted into the 1 st opening hole 6 c. The 1 st protruding portion 10a protrudes from the 1 st opening hole 6c toward the other side in the 1 st direction. The 1 st extension 9a passes through the inside of the 1 st projection 10 a. In the example of the present embodiment, the 1 st extending portions 9a aligned in the 3 rd direction (Y axis direction) pass through the inside of the 1 st projecting portion 10 a. The 1 st extending portion 9a protrudes from the 1 st convex portion 10a toward the other side in the 1 st direction. According to the present embodiment, the insulation between the 1 st opening hole 6c of the housing 6 and the bus bar 9 can be ensured by the 1 st convex portion 10 a.

Although not shown, when viewed in the 1 st direction (X-axis direction), the length of the 1 st convex portion 10a in the 2 nd direction (Z-axis direction) is smaller than the length in the 3 rd direction (Y-axis direction). In the example of the present embodiment, the 1 st projection 10a has an oval shape as viewed in the 1 st direction. The 1 st projection 10a has an oblong shape with a major axis in the Y-axis direction and a minor axis in the Z-axis direction when viewed in the 1 st direction.

The 1 st projection 10a has a columnar shape extending in the 1 st direction. The outer peripheral surface of the 1 st projection 10a faces the inner peripheral surface of the 1 st opening 6 c. The 1 st convex portion 10a has a portion on the 1 st direction side of the outer peripheral surface facing the inner peripheral surface of the 1 st open hole 6 c.

The 1 st projection 10a has a planar outer peripheral surface portion facing the 2 nd direction. The part of the outer peripheral surface of the 1 st convex part 10a facing the 3 rd direction is in a convex curved surface shape. The end surface of the 1 st projection 10a facing the 1 st direction is oblong. The end surface of the 1 st projection 10a facing the 1 st direction has an oblong shape with the Y-axis direction as the major axis and the Z-axis direction as the minor axis.

< connecting Member >

The coupling member 14 is made of resin. The coupling member 14 is disposed between the case 6 and the inverter case 8 in a predetermined direction (1 st direction). The coupling member 14 is in contact with the case 6 and the inverter case 8 in the 1 st direction. The coupling member 14 is sandwiched between the case 6 and the inverter case 8 in the 1 st direction. The connecting member 14 has a plate shape with a plate surface facing the 1 st direction.

The coupling member 14 has a through hole 14a, a 2 nd convex portion 14b, a concave portion 14c, a 1 st groove portion 14d, a 2 nd groove portion 14e, a 3 rd groove portion 14f, and a screw hole 14 g. The through hole 14a penetrates the connecting member 14 in a predetermined direction (1 st direction). The 1 st extending portion 9a passes through the through hole 14a in a predetermined direction. The 1 st extending portion 9a protrudes from the inside of the through hole 14a toward the other side in the 1 st direction.

The through-hole 14a has a rectangular cross section perpendicular to the 1 st direction. The through-hole 14a has a rectangular shape extending in the 3 rd direction when viewed in the 1 st direction. A plurality of through holes 14a are provided. That is, the connecting member 14 has a plurality of through holes 14 a. In the present embodiment, three through holes 14a are provided. Any of the U-phase bus bar 9, the V-phase bus bar 9, and the W-phase bus bar 9 is inserted into the three through holes 14 a. The plurality of through holes 14a are arranged in a direction perpendicular to the 1 st direction (X-axis direction). The plurality of through holes 14a are arranged at intervals in the Y axis direction.

The 2 nd convex portion 14b is inserted into the 2 nd opening hole 8 c. The 2 nd convex portion 14b protrudes from the 2 nd opening hole 8c toward the 1 st direction other side. The through hole 14a penetrates the 2 nd projection 14b in a predetermined direction. The 1 st extending portion 9a inserted into the through hole 14a passes through the inside of the 2 nd projecting portion 14 b. In the example of the present embodiment, the 1 st extending portions 9a aligned in the 3 rd direction (Y-axis direction) pass through the inside of the 2 nd projecting portion 14 b. The 1 st extending portion 9a protrudes from the 2 nd projecting portion 14b toward the other side in the 1 st direction. According to the present embodiment, the insulation between the 2 nd opening hole 8c of the inverter case 8 and the bus bar 9 can be ensured by the 2 nd convex portion 14 b.

Although not shown, the length of the 2 nd convex portion 14b in the 2 nd direction (Z-axis direction) is smaller than the length in the 3 rd direction (Y-axis direction) when viewed in the 1 st direction (X-axis direction). In the example of the present embodiment, the 2 nd convex portion 14b has an oblong shape as viewed in the 1 st direction. The 2 nd projection 14b has an oblong shape with the Y-axis direction as the major axis and the Z-axis direction as the minor axis when viewed in the 1 st direction.

The 2 nd convex portion 14b has a columnar shape extending in the 1 st direction. The outer peripheral surface of the 2 nd convex portion 14b faces the inner peripheral surface of the 2 nd opening hole 8 c. The 2 nd convex portion 14b has a portion on the 1 st direction side of the outer peripheral surface facing the inner peripheral surface of the 2 nd opening hole 8 c.

Although not shown, the 2 nd projecting portion 14b has a planar portion in the 2 nd direction on the outer peripheral surface. The 2 nd convex portion 14b has a convex curved surface at a portion facing the 3 rd direction in the outer peripheral surface. The end surface of the 2 nd convex part 14b facing the 1 st direction is an oblong shape. The end surface of the 2 nd projection 14b facing the 1 st direction has an oblong shape with the Y-axis direction as the major axis and the Z-axis direction as the minor axis.

The recess 14c is disposed on an end surface of the connecting member 14 facing the 1 st direction. The recess 14c is recessed from an end surface of the coupling member 14 facing the 1 st direction side toward the 1 st direction side. The recess 14c has an oblong shape extending in the 3 rd direction when viewed in the 1 st direction. The 1 st projection 10a is inserted into the recess 14 c. The opening dimension of the concave portion 14c in the 2 nd direction is larger than the outer dimension of the 1 st convex portion 10a in the 2 nd direction. The opening size of the recessed portion 14c in the 3 rd direction is larger than the outer size of the 1 st projecting portion 10a in the 3 rd direction. The bottom surface of the inner surface of the concave portion 14c facing the 1 st direction side is in contact with the end surface of the 1 st convex portion 10a facing the 1 st direction side. According to the present embodiment, the 1 st protruding portion 10a is inserted into the recessed portion 14c, so that relative movement of the bus bar support member 10 and the coupling member 14 in the direction perpendicular to the predetermined direction is suppressed, and assembly is facilitated. The through hole 14a opens in the recess 14 c. The through hole 14a penetrates the connecting member 14 from the bottom surface of the concave portion 14c in the 1 st direction to the end surface of the 2 nd convex portion 14b facing the other side in the 1 st direction.

The 1 st groove portion 14d is provided on a surface of the coupling member 14 facing the housing 6. The 1 st groove portion 14d has an annular shape surrounding the 1 st opening 6c when viewed in a predetermined direction (1 st direction). The 1 st groove portion 14d has an oblong shape elongated in the 3 rd direction when viewed in the 1 st direction.

The 2 nd groove portion 14e is provided on a surface of the coupling member 14 facing the inverter case 8. The 2 nd groove portion 14e has an annular shape surrounding the 2 nd opening 8c when viewed in a predetermined direction (1 st direction). The 2 nd groove portion 14e has an oblong shape elongated in the 3 rd direction when viewed in the 1 st direction.

The 3 rd groove portion 14f is provided on the bottom surface of the recess 14c of the coupling member 14. The 3 rd groove portion 14f is in the shape of a ring surrounding the through hole 14a when viewed in a predetermined direction (1 st direction). The 3 rd groove portion 14f surrounds the plurality of through holes 14 a. The 3 rd groove portion 14f has an oblong shape elongated in the 3 rd direction when viewed in the 1 st direction.

The screw hole 14g penetrates the coupling member 14 in a predetermined direction. The screw hole 14g is disposed outside the 1 st groove portion 14d and the 2 nd groove portion 14e when viewed in a predetermined direction. The coupling member 14 has a plurality of screw holes 14 g. The plurality of screw holes 14g are arranged at intervals in a direction perpendicular to the 1 st direction. The plurality of screw holes 1154g are arranged in a ring shape outside the 1 st groove portion 14d and the 2 nd groove portion 14 e. The plurality of screw holes 14g are arranged along an imaginary oval shape long in the 3 rd direction as viewed in the 1 st direction. The position of the screw hole 14g overlaps the position of the screw hole 6g provided in the wall portion 6e of the housing 6 as viewed in the 1 st direction. The housing 6 has a plurality of screw holes 6g in a wall portion 6 e. The screw hole 6g is open on the other side in the 1 st direction.

< screw Member >

The screw member 15 fixes the coupling member 14 to the housing 6. The screw member 15 is provided in plurality. The screw member 15 is inserted into the screw hole 14g of the coupling member 14 and screwed into the screw hole 6g of the housing 6. The screw member 15 penetrates the coupling member 14 in a predetermined direction and is screwed into the housing 6. According to the present embodiment, the inverter case 8 can be attached after the coupling member 14 is fixed to the case 6 by the screw member 15, and the motor unit 1 can be easily assembled.

As in the present embodiment, when the bus bar 9 is bent inside the housing 6, the bus bar 9 cannot be inserted from the outside to the inside of the 1 st opening hole 6c of the housing 6 when the motor unit 1 is assembled. In the present embodiment, the bus bar supporting member 10 and the coupling member 14, which ensure the insulation of the bus bar 9, are provided as separate members. Therefore, the bus bar 9 supported by the bus bar support member 10 can be led to the outside from the inside of the 1 st opening hole 6c of the housing 6. Further, when viewed in a predetermined direction, the portion of the bus bar 9 disposed outside the housing 6 can be surrounded by the connecting member 14. Therefore, the insulation of the bus bar 9 can be ensured, and the assembly of the motor unit 1 is easy.

< 1 st seal part >

The 1 st seal portion 11 is disposed between the case 6 and the coupling member 14 in a predetermined direction, and is in contact with the case 6 and the coupling member 14. The 1 st seal portion 11 is disposed between a surface of the housing 6 facing the other side in the 1 st direction and a surface of the coupling member 14 facing the surface facing the one side in the 1 st direction. The 1 st seal portion 11 is elastically deformable. According to the present embodiment, since the 1 st seal portion 11 is sandwiched between the housing 6 and the coupling member 14 in the predetermined direction, the pressing force in the predetermined direction can be uniformly applied to the entire 1 st seal portion 11. Therefore, the sealing function of the 1 st seal portion 11 is stabilized. The first seal portion 11 can be prevented from being twisted or damaged during assembly. The first seal portion 11 prevents foreign matter such as water from entering the housing 6 from the outside and oil from leaking from the inside to the outside of the housing 6.

The 1 st seal portion 11 has a ring shape surrounding the 1 st opening 6c when viewed in a predetermined direction. The 1 st seal portion 11 has an oblong shape elongated in the 3 rd direction when viewed in the 1 st direction. In the present embodiment, the 1 st seal portion 11 is an O-ring or the like provided as a separate member from the coupling member 14. According to the present embodiment, the 1 st sealing portion 11 stably prevents foreign matter such as water from entering the housing 6 through the 1 st opening hole 6c and oil from leaking out of the housing 6.

The 1 st seal part 11 is disposed in the 1 st groove part 14 d. Therefore, the 1 st seal portion 11 can be easily attached, and the positional deviation of the 1 st seal portion 11 at the time of assembly of the motor unit 1 and after the assembly is suppressed. The 1 st groove portion 14d ensures the 1 st seal portion 11 to have stable sealing performance.

In the present embodiment, the screw member 15 is screwed in, and the pressing force in the predetermined direction acts on the 1 st seal portion 11 via the coupling member 14, whereby the 1 st seal portion 11 is more stable in sealing performance. The movement of the 1 st seal part 11 can be suppressed even after the assembly, and the sealing function can be maintained well.

< 2 nd seal part >

The 2 nd seal portion 12 is disposed between the coupling member 14 and the inverter case 8 in a predetermined direction, and is in contact with the coupling member 14 and the inverter case 8. The 2 nd seal portion 12 is disposed between a surface of the coupling member 14 facing the other side in the 1 st direction and a surface of the inverter case 8 facing the surface facing the one side in the 1 st direction. The 2 nd seal portion 12 is elastically deformable. According to the present embodiment, since the 2 nd seal part 12 is sandwiched between the coupling member 14 and the inverter case 8 in the predetermined direction, the pressing force in the predetermined direction can be uniformly applied to the entire 2 nd seal part 12. Therefore, the sealing function of the 2 nd seal portion 12 is stabilized. It is possible to suppress the occurrence of distortion, damage, or the like in the 2 nd seal part 12 at the time of assembly. The 2 nd seal portion 12 suppresses entry of foreign matter such as water from the outside of the inverter case 8 into the inside.

The 2 nd seal portion 12 has an annular shape surrounding the 2 nd opening 8c when viewed in a predetermined direction. The 2 nd seal portion 12 has an oblong shape elongated in the 3 rd direction when viewed in the 1 st direction. In the present embodiment, the 2 nd seal portion 12 is an O-ring or the like provided as a separate member from the coupling member 14. According to the present embodiment, the 2 nd sealing portion 12 stably prevents foreign matter such as water or oil from entering the inverter case 8 from the outside through the 2 nd opening hole 8 c. In the illustrated example, the 2 nd seal part 12 is disposed inside the 1 st seal part 11 as viewed in the 1 st direction. That is, the diameter of the 2 nd sealing part 12 is smaller than the diameter of the 1 st sealing part 11. In addition, the circumferential length of the 2 nd seal part 12 is shorter than the circumferential length of the 1 st seal part 11.

The 2 nd seal part 12 is disposed in the 2 nd groove part 14 e. Therefore, the 2 nd seal part 12 can be easily attached, and the positional deviation of the 2 nd seal part 12 at the time of assembling the motor unit 1 and after the assembling is suppressed. The 2 nd groove portion 14e stably ensures the sealing property of the 2 nd seal portion 12.

< 3 rd seal part >

The 3 rd seal portion 13 is disposed between the bus bar support member 10 and the coupling member 14 in a predetermined direction, and is in contact with the bus bar support member 10 and the coupling member 14. The 3 rd seal portion 13 is disposed between the surface of the bus bar support member 10 facing the other side in the 1 st direction and the surface of the coupling member 14 facing the surface facing the one side in the 1 st direction. The 3 rd seal portion 13 is elastically deformable. According to the present embodiment, since the 3 rd seal portion 13 is sandwiched between the bus bar supporting member 10 and the connecting member 14 in the predetermined direction, the pressing force in the predetermined direction can be uniformly applied to the entire 3 rd seal portion 13. Therefore, the sealing function of the 3 rd sealing portion 13 is stabilized. The 3 rd seal part 13 can be prevented from being twisted or damaged during assembly. The 3 rd sealing portion 13 prevents oil or the like from moving from the inside of the case 6 to the inside of the inverter case 8 through the 1 st opening hole 6 c. The 3 rd sealing portion 13 suppresses oil and the like from moving from the 1 st opening hole 6c toward the through hole 14 a.

The 3 rd seal portion 13 is disposed on an end surface of the 1 st projection 10a in the predetermined direction. The 3 rd seal portion 13 faces the end surface of the 1 st projection 10a facing the other side in the 1 st direction. According to the present embodiment, by providing the 1 st protruding portion 10a, the bus bar support member 10 and the coupling member 14 can be brought close to each other in a predetermined direction through the 1 st opening hole 6c, and the sealing performance of the 3 rd sealing portion 13 can be stabilized.

The 3 rd seal portion 13 is formed in a ring shape surrounding the through hole 14a when viewed in a predetermined direction. The 3 rd seal portion 13 has an oblong shape elongated in the 3 rd direction when viewed in the 1 st direction. In the present embodiment, the 3 rd seal portion 13 is an O-ring or the like provided as a separate member from the coupling member 14. According to the present embodiment, the 3 rd sealing portion 13 stably prevents oil or the like from moving from the inside of the case 6 to the inside of the inverter case 8 through the through hole 14 a.

The 3 rd seal part 13 is disposed in the 3 rd groove part 14 f. Therefore, the 3 rd sealing portion 13 can be easily attached, and the positional displacement of the 3 rd sealing portion 13 during and after the assembly of the motor unit 1 can be suppressed. The 3 rd sealing part 13 is stably sealed by the 3 rd groove part 14 f.

In addition, in the present embodiment, the bus bar 9 has the 2 nd extending portion 9b extending in a direction different from the 1 st extending portion 9a, and the bus bar 9 is bent inside the housing 6. Also, the bus bar 9 has a 3 rd extending portion extending in a direction different from the 1 st extending portion 9a and the 2 nd extending portion 9 b. Even if such a shape of the bus bar 9 is adopted, according to the present embodiment, the assembly of the motor unit 1 is easily performed.

When the inverter case 8 and the motor housing portion 6a are arranged adjacent to each other in the radial direction of the motor axis J2 as in the present embodiment, it is difficult to easily assemble the support structure of the bus bar 9 that spans these members and to ensure the sealing performance of the 1 st opening hole 6c and the 2 nd opening hole 8 c. According to the present embodiment, the assembly of the support structure of the bus bar 9 is easy, and the sealability of the 1 st opening hole 6c and the 2 nd opening hole 8c is ensured.

In the present embodiment, the inverter case 8 and the motor housing portion 6a are adjacent to each other in the horizontal direction, and therefore the outer dimension of the motor unit 1 in the vertical direction (the direction of gravity) is kept small. Therefore, the motor unit 1 can be easily stored in a limited installation space such as a vehicle.

The present invention is not limited to the above-described embodiments, and for example, as described below, structural modifications and the like can be made without departing from the scope of the present invention.

In the above embodiment, the 1 st convex portion 10a is provided on the bus bar supporting member 10, and the concave portion 14c is provided on the coupling member 14, but the present invention is not limited thereto. As in the modification shown in fig. 4, the 1 st convex portion 14h may be provided in the coupling member 14, and the concave portion 10b may be provided in the bus bar support member 10. The 1 st projection 14h is inserted into the 1 st opening 6 c. The 1 st convex portion 14h is inserted into the concave portion 10 b. That is, the 1 st convex portions 10a and 14h inserted into the 1 st opening 6c are provided on one of the bus bar supporting member 10 and the coupling member 14, and the 1 st convex portions 10a and 14h are inserted into the other of the bus bar supporting member 10 and the coupling member 14.

The 1 st seal portion 11 may not be an O-ring. The 1 st seal part 11 may be in a liquid state or a gel state. The 1 st sealing part 11 may be made of silicone resin. The 1 st seal part 11 may not be elastically deformable. The 1 st seal part 11 may be made of metal. The 1 st sealing portion 11 and the coupling member 14 may be part of one member manufactured by two-color molding.

The 2 nd seal part 12 may not be an O-ring. The 2 nd seal part 12 may be in a liquid state or a gel state. The 2 nd sealing part 12 may be made of silicone resin. The 2 nd seal portion 12 may not be elastically deformable. The 2 nd seal part 12 may be made of metal. The 2 nd seal portion 12 and the coupling member 14 may be part of one member manufactured by two-color molding.

The 3 rd sealing part 13 may not be an O-ring. The 3 rd seal part 13 may be in a liquid state or a gel state. The 3 rd sealing portion 13 may be made of silicone resin. The 3 rd seal portion 13 may not be elastically deformable. The 3 rd sealing portion 13 may be made of metal. The 3 rd sealing portion 13 and the coupling member 14 may be portions of one member manufactured by two-color molding.

In the above-described embodiment, the plurality of through holes 14a are provided in the connecting member 14, but only one through hole 14a may be provided in the connecting member 14. In this case, a plurality of 1 st extending portions 9a are inserted into the through-hole 14 a.

In addition, the respective configurations (constituent elements) described in the above-described embodiment, modification example, rewriting example, and the like may be combined, and addition, omission, replacement, and other changes of the configuration may be made, within a range not departing from the gist of the present invention. The present invention is not limited to the above-described embodiments, but is only limited by the claims.

Description of the reference symbols

1: a motor unit; 2: a motor; 6: a housing; 6 a: a motor storage section; 6 c: 1 st opening hole; 15: a screw member; 7: an inverter; 8: an inverter case; 8 c: 2 nd opening hole; 9: a bus bar; 9 a: 1 st extension part; 9 b: a 2 nd extension part; 10: a bus bar support member; 10a, 14 h: the 1 st convex part; 10b, 14 c: a recess; 11: the 1 st sealing part; 12: a 2 nd seal part; 13: a 3 rd sealing part; 14: a connecting member; 14 a: a through hole; 14 b: a 2 nd convex part; 14 d: a 1 st groove part; 14 e: a 2 nd groove part; j2: a motor axis.

Claims (13)

1. A motor unit having:

a motor;

an inverter that supplies power to the motor;

a bus bar having a 1 st extending portion extending in a prescribed direction, the bus bar connecting the motor and the inverter;

a housing having a 1 st opening hole through which the 1 st extension passes, the housing accommodating the motor;

an inverter case having a 2 nd opening hole opposed to the 1 st opening hole in the predetermined direction and through which the 1 st extension portion passes, the inverter case housing the inverter;

a bus bar support member that is disposed in the housing and supports the bus bar;

a coupling member having a through hole through which the 1 st extending portion passes in the predetermined direction, the coupling member being disposed between the case and the inverter case in the predetermined direction;

a 1 st seal portion that is disposed in the predetermined direction between a surface of the housing facing the other side in the predetermined direction and a surface of the coupling member facing the one side in the predetermined direction, the surface facing the other side in the predetermined direction being opposed to the surface of the housing facing the other side in the predetermined direction, and that is in contact with the housing and the coupling member;

a 2 nd seal portion that is disposed in the predetermined direction between a surface of the coupling member facing the other side of the predetermined direction and a surface of the inverter case facing the one side of the predetermined direction, the surface facing the other side of the predetermined direction being opposed to the surface of the coupling member, and that is in contact with the coupling member and the inverter case;

a screw member that penetrates the coupling member in the predetermined direction and is screwed into the housing to fix the coupling member to the housing; and

a 3 rd seal portion that is disposed between a surface of the bus bar support member facing the other side in the predetermined direction and a surface of the coupling member facing the one side in the predetermined direction, the surface facing the other side in the predetermined direction of the bus bar support member, and that is in contact with the bus bar support member and the coupling member,

the circumference of the 2 nd sealing part is shorter than the circumference of the 1 st sealing part.

2. The motor unit according to claim 1,

the 1 st sealing portion has a ring shape surrounding the 1 st opening hole when viewed in the predetermined direction.

3. The motor unit according to claim 1 or 2, wherein,

the 2 nd seal portion has an annular shape surrounding the 2 nd opening hole when viewed in the predetermined direction.

4. The motor unit according to claim 1,

either one of the bus bar supporting member and the coupling member is provided with a 1 st convex portion inserted into the 1 st opening hole,

the 3 rd sealing part is disposed on an end face of the 1 st convex part in the predetermined direction.

5. The motor unit according to claim 1,

the 3 rd seal portion has a ring shape surrounding the through hole when viewed in the predetermined direction.

6. The motor unit according to any one of claims 1, 2, 4, and 5, wherein,

either one of the bus bar support member and the coupling member is provided with a 1 st projection inserted into the 1 st opening hole,

the 1 st extension passes through the inside of the 1 st protrusion.

7. The motor unit of claim 6,

the other of the bus bar supporting member and the coupling member, which is different from the one, is provided with a concave portion into which the 1 st convex portion is inserted.

8. The motor unit according to any one of claims 1, 2, 4, and 5, wherein,

the connecting member has a 2 nd protrusion inserted into the 2 nd opening hole,

the through hole penetrates the 2 nd convex portion in the predetermined direction.

9. The motor unit according to any one of claims 1, 2, 4, and 5, wherein,

the bus bar has a 2 nd extending portion extending from the 1 st extending portion in a direction intersecting the prescribed direction inside the housing.

10. The motor unit according to any one of claims 1, 2, 4, and 5, wherein,

the connecting member has a 1 st annular groove portion surrounding the 1 st opening hole on a surface of the connecting member facing the housing when viewed in the predetermined direction,

the 1 st seal portion is disposed in the 1 st groove portion.

11. The motor unit according to any one of claims 1, 2, 4 and 5, wherein,

the coupling member has a 2 nd annular groove portion surrounding the 2 nd opening hole on a surface of the coupling member facing the inverter case when viewed in the predetermined direction,

the 2 nd seal part is disposed in the 2 nd groove part.

12. The motor unit according to any one of claims 1, 2, 4 and 5, wherein,

the housing has a motor receiving portion receiving the motor,

the motor axis of the motor extends in a direction perpendicular to the predetermined direction, and the inverter case and the motor housing are disposed adjacent to each other in a radial direction of the motor axis.

13. The motor unit of claim 12,

the inverter case and the motor housing are adjacent in a horizontal direction.

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