JP6619839B2 - In-wheel motor drive device - Google Patents

Description

The present invention relates to an in-wheel motor drive device for driving a wheel, and more particularly to an internal structure of a terminal box for drawing a power line, a signal cable and the like into the in-wheel motor drive device.

The in-wheel motor drive device is not only less burdensome on the environment because it is electrically driven, but also installed in the wheel of an automobile to drive the wheel, so that it has a larger cabin than an engine automobile. Space can be secured, which is advantageous. By the way, it is necessary to connect a power line for supplying electric power to the in-wheel motor drive device. The present applicant has already proposed Patent Document 1 as a connection structure between an in-wheel motor drive device and a power line. In the technique described in Patent Document 1, a terminal box is attached to the casing of the in-wheel motor drive device, and three power lines are connected to the terminal box.

JP 2009-219271 A

Since the in-wheel motor drive device is disposed in the space area inside the road wheel of the wheel that contacts the road surface and drives the wheel, various vibrations and forces are input to the in-wheel motor drive device from the road surface side. Further, since the in-wheel motor driving device is attached to the vehicle body via the suspension device, various vibrations and forces are also input to the in-wheel motor driving device from the vehicle body side. Furthermore, since the in-wheel motor drive device is disposed near the road surface, foreign matters such as sand and muddy water fly. Therefore, foreign matter such as sand and muddy water does not enter the in-wheel motor drive device via the connection point between the in-wheel motor drive device and the power line, and oil that lubricates the inside of the in-wheel motor drive device In order not to ooze out from the connection portion, it is necessary to provide a special sealing property as compared with a normal motor.

The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the sealing performance at the connection point between the in-wheel motor drive device and the power line.

For this purpose, an in-wheel motor drive device according to the present invention includes an interior of an in-wheel motor drive device lubricated by lubricating oil, an air chamber into which a tip of a power line extending from the outside of the in-wheel motor drive device is inserted, an air A non-conductive partition wall that is disposed in a passage extending from the chamber to the inside of the in-wheel motor drive device and partitions the interior of the in-wheel motor drive device and the air chamber, and a conductor that extends across the partition wall, and has one end A conductive member disposed inside the in-wheel motor drive device and connected to the motor coil, the other end being disposed in the air chamber and connected to the tip of the power line, and surrounding the outer peripheral surface of the partition wall and the inner peripheral surface of the passage And an annular sealing material in contact with .

According to the present invention, since the tip of the power line extending from the outside to the in-wheel motor drive device is inserted into the air chamber of the in-wheel motor drive device, the tip of the power line can be protected from foreign matter. Further, since the air chamber and the inside of the in-wheel motor drive device are partitioned by the partition wall, it is possible to prevent the lubricating oil from leaching from the inside of the in-wheel motor drive device to the air chamber along the conductive member. Therefore, the connection location between the in-wheel motor drive device and the power line can be double-sealed by the partition wall and the wall defining the air chamber, and the interior of the in-wheel motor drive device can be formed by the partition wall at the connection location. It is possible to improve the sealing performance. The inside of the in-wheel motor drive device is, for example, a motor chamber that houses a rotor and a stator of a motor, a reduction chamber that houses a gear set of a speed reduction mechanism, or a gear set of a motor rotor and a speed reduction mechanism. Or a large chamber that accommodates the rotation sensor or other mechanical elements.

The shape of the conductive member is not particularly limited. The conductive member may be, for example, a straight or bent round bar or square bar, or a long plate with both ends bent. Further, since the power line supplies a large current to the motor of the in-wheel motor drive device, a larger current flows than the signal cable . For this reason, the power line is covered with a non-conductive material such as vinyl chloride resin. As one embodiment of the present invention, a plurality of conductive members are provided, and the sealing material is provided on each of the plurality of conductive members. In one embodiment, the plurality of conductive members extend across a common partition wall.

As an embodiment of the present invention, the interior of the in-wheel motor drive device and the air chamber are respectively defined by the casing of the in-wheel motor drive device, and the conductive member is formed in the casing to connect the interior of the in-wheel motor drive device and the air chamber. The non-conductive partition wall is a resin filled in a gap between the inner peripheral surface of the passage and the outer peripheral surface of the conductive member. According to this embodiment, since the gap between the inner peripheral surface of the hole and the outer peripheral surface of the conductive member is filled with the resin, the sealing function of the partition wall can be ensured. As another embodiment, the partition wall may be a pre-formed component, and may be interposed between the inner peripheral surface of the hole and the outer peripheral surface of the conductive member.

As a preferred embodiment of the present invention, an annular sealing material that surrounds the outer peripheral surface of the conductive member and is embedded in the partition wall is further provided. According to this embodiment, not only the outer peripheral surface of the conductive member is surrounded by the partition wall, but also the annular sealing material is interposed between the outer peripheral surface of the conductive member and the partition wall, so that the sealing performance of the partition wall is increased. Can be further ensured. Therefore, the durability of the sealing function is improved and deterioration over time can be prevented.

As a preferred embodiment of the present invention, a second air chamber into which a tip of a signal line extending from the outside of the in-wheel motor drive device is inserted, and a non-conductive property that partitions the second air chamber from the inside of the in-wheel motor drive device. A second partition wall and a conductor extending across the second partition wall, one end of which is disposed inside the in-wheel motor drive device and connected to the sensor, and the other end is the second
You may further provide the 2nd electrically-conductive member arrange | positioned in an air chamber and connected with the front-end | tip of a signal wire | line. According to this embodiment, since the tip of the signal line extending from the outside to the in-wheel motor drive device is inserted into the second air chamber of the in-wheel motor drive device, the tip of the signal line can be protected from foreign matter. it can. Furthermore, since the second air chamber and the inside of the in-wheel motor drive device are partitioned by a partition wall, the lubricating oil oozes from the inside of the in-wheel motor drive device to the second air chamber along the second conductive member. Can be prevented. Accordingly, the connection portion between the in-wheel motor drive device and the signal line can be double-sealed by the partition wall and the wall defining the air chamber, and the inside of the in-wheel motor drive device can be sealed by the second partition wall. The property can be further improved.

As described above, according to the present invention, the connection portion between the in-wheel motor driving device and the power line can be protected from foreign matter by the wall defining the air chamber, and further, the inside of the in-wheel motor driving device is defined. The walls can protect against in-wheel motor drive lubricant.

Also, the inside of the in-wheel motor drive device is basically secured by a casing. However, since a part of the casing is perforated and a tip of the power line is inserted, the sealing performance is reduced at the place. There is a risk of becoming vulnerable. ADVANTAGE OF THE INVENTION According to this invention, the inside of an in-wheel motor drive device can be protected from a foreign material by the wall which defines an air chamber, and the wall which defines the inside of an in-wheel motor drive device. Moreover, the sealing performance inside the in-wheel motor drive device can be ensured by the partition wall. Furthermore, the partition wall is also protected from foreign matter by the wall defining the air chamber.

Since the in-wheel motor drive device is close to the road surface, foreign matters such as water, mud, sand, and dust frequently fly. However, the provision of the present invention improves the sealing performance of the connection part of the power line than before. , Durability is improved.

It is explanatory drawing which shows the in-wheel motor drive device which becomes one Embodiment of this invention. It is a schematic longitudinal cross-sectional view which shows the basic composition of the embodiment. It is a longitudinal cross-sectional view of the terminal box and motor part of the embodiment. It is sectional drawing of a terminal box. It is a schematic sectional drawing which shows the connection structure of a terminal box and a signal wire | line. It is a longitudinal cross-sectional view which shows the in-wheel motor drive device which becomes other embodiment of this invention. It is sectional drawing which shows the state cut | disconnected by VII-VII of FIG. It is an external view of the terminal box seen from the same direction as FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing an in-wheel motor drive device according to an embodiment of the present invention, as viewed from the inner side in the vehicle width direction. FIG. 2 is a schematic longitudinal sectional view showing a basic configuration of the embodiment. FIG. 3 is an explanatory view showing the same embodiment in a cross section different from that in FIG. 2, and shows a cross sectional view of the terminal box and the motor unit. 4 is a cross-sectional view of the terminal box, which is a cross-sectional view taken along the line IV-IV of FIG. 3 and viewed in the direction of the arrow. FIG. 3 shows a cross section of the in-wheel motor drive device cut along a plane including the axis O of the in-wheel motor drive device. Since the inside of the in-wheel motor drive device is substantially symmetric with respect to the axis O, one side across the axis O is shown and the other side is omitted. The in-wheel motor drive device 11 has a substantially cylindrical shape, and a motor unit 11A and a reduction unit 11B that are sequentially arranged in series and coaxially in the axis O direction of the in-wheel motor drive device 11.
And a hub portion 11C. The speed reduction part 11B adjacent to the hub part 11C is the hub part 11C.
Is made larger than the diameter. The motor part 11A adjacent to the speed reducing part 11B has a larger diameter than the speed reducing part 11B.

As shown in FIG. 2, a casing 21b that forms an outline of the motor portion 11A and the speed reduction portion 11B.
Is a non-rotating fixing member. On the other hand, the hub portion 11C has a rotating member on the inner ring side and a fixing member on the outer ring side, and a wheel 111 is attached and fixed to the rotating member (hub wheel 77), and the rotational driving force of the motor portion 11A is supplied to the wheel. The wheel 111 is rotated and supported. The in-wheel motor drive device 11 is provided in the inner space S of the road wheel 112 of the wheel 111 as shown in FIG.

The inner space region S is a circular space surrounded by the rim portion of the road wheel 112, and the hub portion 11
All of C, all of the deceleration unit 11B, and a part of the motor unit 11A are located in the inner space region S. On the other hand, the end surface side portion of the motor unit 11A is located outside the inner space region S. In addition, the trailing arm 113 of the suspension device extends in the vehicle front-rear direction, and the trailing end of the trailing arm 113 extends to the inner space region S to the outer side in the vehicle width direction and is coupled to the casing 21b.

As shown in FIG. 2, the motor unit 11A accommodates a rotor 12, a stator 13, and a motor shaft 14a of a rotating electrical machine in a motor chamber L in casings 21a and 21b. The motor unit 11A rotationally drives the hub unit 11C through the speed reduction unit 11B, or performs power regeneration using the rotation of the hub unit 11C (wheel 111) during braking or the like. Casing 2
1a is a disk-shaped member that closes the end of the motor unit 11A. The casing 21b is a cylindrical member that is open at both ends. One end of the casing 21b is closed by the casing 21a, and the stator 13 is attached and fixed to the inner peripheral surface at one end in the axial direction at a predetermined interval in the circumferential direction. The rotor 12 is disposed on the inner diameter side of the stator 13, and the rotor 12 is attached and fixed to a motor shaft 14 a extending along the axis O.

The casing 21b defines a deceleration chamber N on the other axial end side, and accommodates the deceleration mechanism of the deceleration unit 11B in the deceleration chamber N. The speed reduction mechanism is a cycloid speed reduction mechanism, and includes an input shaft 14b, a pair of eccentric members 71, two rolling bearings 72, two wavy curved plates 73, and an inner pin 74.
And an outer pin 75 and an output shaft 76. The input shaft 14b of the deceleration unit 11B is the motor unit 11
The motor shaft 14a of A is connected and fixed. The eccentric member 71 is eccentrically provided on the input shaft 14b. The two curved plates 73 have a central hole, and the inner peripheral surface of the central hole is rotatably supported on the outer peripheral surface of the eccentric member 71 via the rolling bearing 72. The outer pin 75 is fixed to the outer pin housing 79 elastically supported by the casing 21b, engages with the outer peripheral portion formed in the waveform of the curved plate 73, and rotates the curved plate 73 revolving around the axis O. Inner pin 74 is output shaft 7
6, and only the rotational movement of the curved plate 73 is taken out and transmitted to the output shaft 76. The rotation of the input shaft 14b is decelerated by the deceleration unit 11B and output from the output shaft 76.

A hub wheel 77 is connected and fixed to the output shaft 76. The hub wheel 77 is connected via a rolling bearing 78.
The casing 21b is rotatably supported. A road wheel 112 is fixedly attached to the hub wheel 77.

The in-wheel motor drive device 11 includes a lubricating oil circuit of an axial oil supply system, and includes a motor unit 11A.
And the deceleration part 11B is lubricated. Specifically, the lubricating oil tank 5 is provided at the lower part of the casing 21b.
3 is attached. A lubricating oil pump 51 is provided in a partition wall 21e of the casing that serves as a boundary between the motor chamber L that houses the motor unit 11A and the deceleration chamber N that houses the deceleration unit 11B. The lubricating oil pump 51 is arranged coaxially with the axis O, and is fixed to the inner pin 74 with the inner pin reinforcing member 7.
Driven by 4b. A suction oil passage 52 formed in the wall of the partition wall 21e extends in the vertical direction, and an upper end thereof is connected to the suction port of the lubricant pump 51, and a lower end thereof is provided in the lower portion of the speed reduction unit 11B. 53. Discharge oil passage 5 formed inside the wall of the partition wall 21e
4 extends in the vertical direction, and is connected at its lower end to the discharge port of the lubricating oil pump 51 and at its upper end to one end of a casing oil passage 55 formed in the casing 21b.

The casing oil passage 55 is formed inside the wall of the casing 21b which becomes a hollow cylindrical wall, and extends in the axial direction. An end of the casing oil passage 55 on the casing 21 a side is connected to the communication oil passage 56.
The connecting oil passage 56 connected to the outer diameter side end of the casing 21a is formed inside the wall of the casing 21a which becomes a disk-shaped wall and extends in the radial direction. The inner diameter side end of the communication oil passage 56 is connected to a motor shaft oil passage 58a provided in the motor shaft 14a.

The motor shaft oil passage 58a is provided inside the motor shaft 14a and extends along the axis O. Then, one end of the motor shaft oil passage 58a closer to the speed reduction portion 11B is connected to a speed reduction portion input shaft oil passage 58b provided on the input shaft 14b and extending along the axis O. Further, one end of the motor shaft oil passage 58a on the side far from the speed reduction portion 11B is connected to the communication oil passage 56 described above. Further, the motor shaft oil passage 58a is connected to the inner diameter side end of the rotor oil passage 64 formed in the rotor flange portion in the middle in the axial direction.

The speed reducer input shaft oil passage 58b is provided inside the input shaft 14b and extends along the axis O between both ends of the input shaft 14b. A lubricating oil hole 60 is provided at one end facing the output shaft 76.
The lubricating oil hole 60 injects lubricating oil toward the deceleration chamber N.

The speed reducer input shaft oil passage 58b is a lubricating oil passage 5 extending radially outward in the eccentric member 71.
Branch to 9. The outer diameter side end of the lubricating oil passage 59 is connected to a rolling bearing 72 provided between the outer peripheral surface of the eccentric member 71 and the inner peripheral surface of the curved plate 73.

A deceleration part return hole 61 is provided at the bottom of the deceleration chamber N. The speed reduction part return hole 61 passes through the casing 21 b and connects the speed reduction chamber N and the lubricating oil tank 53. A motor part return hole 66 is provided at the bottom of the motor chamber L. The motor part return hole 66 penetrates the partition wall 21 e and communicates the motor chamber L and the lubricating oil tank 53.

The operation of the lubricating oil circuit will be described. The lubricating oil pump 51 driven by the output shaft 76 via the inner pin reinforcing member 74b is connected to the lubricating oil via the suction oil passage 52 as indicated by a white arrow in FIG. The lubricating oil stored in the tank 53 is sucked and the lubricating oil is discharged to the discharge oil passage 54. The lubricating oil is pressurized by the lubricating oil pump 51 and flows sequentially from the discharge oil passage 54 to the casing oil passage 55, the communication oil passage 56, and the motor shaft oil passage 58a. A part of the lubricating oil flowing through the motor shaft oil passage 58a flows into the rotor oil passage 64 and is injected from the outer peripheral surface of the rotor 12 into the motor chamber L.
The rotor 12 and the stator 13 are lubricated and cooled. Next, the lubricating oil goes to the bottom of the motor chamber L and returns to the lubricating oil tank 53 through the motor part return hole 66. In this way, the motor portion 11A is lubricated by the axial center oil supply system. The motor chamber L is filled with the injected lubricating oil.

Lubricating oil flowing from the motor shaft oil path 58a to the speed reducing part input shaft oil path 58b branches, flows through the lubricating oil path 59 and the lubricating oil hole 60, and is injected into the speed reducing chamber N, and the rolling bearing 72 of the speed reducing part 11B.
The curved plate 73, the inner pin 74, and the outer pin 75 are lubricated and cooled. Next, the lubricating oil goes to the bottom of the deceleration chamber N and returns to the lubricating oil tank 53 through the deceleration unit return hole 61. In this way, the speed reducing portion 11B is lubricated by the axial center oil supply system. The deceleration chamber N is filled with the injected lubricating oil.

As shown in FIG. 1, a terminal box 22 for drawing three power lines 101 extending from the inverter 121 into the motor unit 11 </ b> A is provided on the outer periphery of the motor unit 11 </ b> A. The terminal box 22 is provided so as to be positioned inside the vehicle body of the trailing arm 113 attached to the casing of the speed reducing portion 11B. The three power lines 101 are supported on the inner surface in the vehicle width direction of the trailing arm 113 and extend forward from the terminal box 22 along the trailing arm 113 to the front of the vehicle. Further, the signal line 10 of the rotation angle sensor 49 for detecting the rotation angle of the motor.
5 also extends forward from the terminal box 22 along the trailing arm 113 in the same manner as the three power lines 101. As shown in FIG. 3, the terminal box 22 is provided across the three through holes 23 extending in the direction perpendicular to the axis O and the three through holes 23.
This is a box body including one bracket 24 for commonly supporting and fixing the power line 101 inserted into the terminal box and a plate-like cover 25 for closing one side of the terminal box 22. And terminal box 2
2 is fixedly attached to the casings 21a and 21b. Thus, the terminal box 22 can be considered part of the casing. Therefore, as a modification, the terminal box 22 is made of the casing 2.
It may be formed integrally with 1a or the casing 21b.

The plate-like bracket 24 is connected to a cylindrical collar 103 that covers the outer skin of the power line 101.
The plate-like bracket 24 is fixed to the terminal box 22 with bolts 24 b and seals an annular gap between the outer periphery of the collar 103 and the inner periphery of the through hole 23. Thus, the bracket 24 supports and fixes the power line 101 via the collar 103, and prevents foreign matters such as water, mud, and sand from entering the air chamber M from the outside of the terminal box 22 via the through hole 23. To prevent.

The outer edge of the disc-shaped casing 21a basically matches the outer diameter of the cylindrical casing 21b, but a part 21d of the outer edge of the casing 21a is formed so as to extend to the outer diameter side of the outer diameter of the casing 21b. As a result, a portion 21d and the casing 21b are displaced in the radial direction, and a passage 27 that connects the inside and outside of the casing is generated. The passage 27 is closed by three conductive members 31 extending in the direction of the axis O and a partition wall 41 that surrounds the outer periphery of the conductive member 31.

A groove and a sealing material 26 that is accommodated along the groove are provided in a portion of the terminal box 22 that comes into contact with the outer edge of the casing 21a. The sealing material 26 is sandwiched between the terminal box 22 and the casing 21a, and seals these gaps. Thereby, the sealing performance of the connection location of the terminal box 22 and the casing 21a improves. Although not shown in the drawing, a sealing material may be provided at a connection portion between the terminal box 22 and the casing 21b.

A rotor 12 disposed inside the in-wheel motor drive device 11, a stator 13,
The motor shaft 14a and the various rolling bearings 15 and 16 that rotatably support the motor shaft are lubricated by lubricating oil that is injected from the rotor oil passage 64 and scattered in the inside of the in-wheel motor drive device 11. The casings 21 a and 21 b of the present embodiment constitute a motor chamber L inside the in-wheel motor drive device 11. In contrast, the terminal box 22 is a box.
Constitutes the air chamber M. The motor chamber L and the air chamber M include a conductive member 31 and a partition wall 41.
Therefore, the lubricating oil in the motor chamber L does not ooze into the air chamber M, and conversely, the air in the air chamber M does not enter the motor chamber L.

The conductive member 31 is a metal rod such as copper and has conductivity. One end of the conductive member 31 is the motor chamber L
The other end of the conductive member 31 is disposed in the air chamber M. Female screw holes are formed at both ends of the conductive member 31. A bolt 32 is screwed into a female screw hole at one end of the conductive member 31 disposed in the motor chamber L. Thus, one end of the conductive member 31 is connected to the metal terminal 19 of the conductive wire 18 extending from the motor coil 17 of the stator 13 by the bolt 32. A bolt 33 is screwed into the female screw hole at the other end of the conductive member 31 disposed in the air chamber M. Thereby, the conductive member 3
The other end of 1 is connected to the tip metal terminal 102 of the power line 101 extending from the outside of the in-wheel motor drive device 11 by a bolt 33.

Here, the operation for connecting the power line 101 to the terminal box 22 will be described.
When the cover 25 is removed from the terminal box 22, the other end of the conductive member 31 can be accessed from the outside of the terminal box 22. The cover 25 is attached to the terminal box 22 in a posture substantially orthogonal to the axis O,
Since the other end of the conductive member 31 and the tip metal terminal 102 face each other, the conductive member 31 is protected against foreign matters such as pebbles, sand, water, and mud flying from the outside.

As shown in FIG. 4, the partition wall 41 is a member that partitions the motor chamber L and the air chamber M, and is a non-conductor made of a resin having oil resistance such as rubber or plastic. Partition wall 4 of this embodiment
Reference numeral 1 denotes one block body having a shape that is approximately equal to the cross-sectional shape of the passage 27 or larger than the cross-sectional shape of the passage 27 in advance. The partition wall 41 is inserted and fixed in the passage 27,
It is fixed to the terminal box 22 by a bolt 45 or other fixing means. Further, the partition wall 41 is provided with three through holes 42 having a shape substantially equal to the cross-sectional shape of the conductive member 31 or smaller than the cross-sectional shape of the conductive member 31. The conductive member 31 has a through hole 42.
Inserted and fixed.

The partition wall 41 surrounds the outer periphery of the conductive member 31 and the passage 27 and the terminal box 22.
The annular space between the inner wall surface of the terminal box 22 and the conductive member 31 is completely closed. Therefore, the motor chamber L and the air chamber M inside the in-wheel motor drive device 11
Is completely blocked. As a result, the air chamber M, which is the connection point of the power line 101, can be protected from the lubricating oil scattered in the motor chamber L inside the in-wheel motor drive device 11.

The inner diameter of the through hole 42 of the partition wall 41 is made larger in the cross section on the air chamber M side than the cross section on the motor chamber L side. A slightly open annular gap G is formed between the inner peripheral surface of the through hole 42 on the air chamber M side and the outer peripheral surface of the other end of the conductive member 31. On the other hand, the inner peripheral surface of the through hole 42 on the motor chamber L side is in close contact with the outer peripheral surface of one end of the conductive member 31 over the entire periphery, and completely blocks the motor chamber L and the air chamber M. In addition, as to the outer edge of the partition wall 41, the outer edge on the air chamber M side is made smaller than the outer edge on the motor chamber L side. And between the outer edge of the partition wall 41 on the air chamber M side and the inner wall surface of the terminal box 22 (see FIG. 4), between the outer edge of the partition wall 41 on the air chamber M side and the surface of the casing 21b (FIG. 3). A slightly open annular gap F is formed in the reference). In contrast, the outer edge of the partition wall 41 on the motor chamber L side is in close contact with the inner wall surface of the terminal box 22 or the surface of the casing 21b over the entire circumference.

Alternatively, as a modification of the partition wall 41, the conductive member 31 is first inserted into a passage 27 formed in the casings 21 a and 21 b and connecting the motor chamber L and the air chamber M.
7 may be a resin that is filled in a gap between the inner peripheral surface of 7 and the outer peripheral surface of the conductive member 31 and is cured by a subsequent chemical reaction.

Returning to FIG. 3, the present embodiment further includes an annular seal member 43 that surrounds the outer peripheral surface of the conductive member 31 and is embedded in the partition wall 41. The sealing material 43 may be installed in an annular groove formed on the outer periphery of each conductive member 31. In addition, the present embodiment further includes an annular sealing material 44 that surrounds the outer peripheral surface of the partition wall 41 that is molded in advance and that contacts the inner peripheral surface of the passage 27. The sealing material 44 is preferably installed in an annular groove formed on the outer periphery of the block-shaped partition wall 41. These sealing materials 43 and 44 are embedded in the partition wall 41 and completely block between the conductive member 31 and the partition wall 41 and between the partition wall 41 and the passage 27. Thereby, the sealing performance in the terminal box 22 is further improved. The sealing materials 43 and 44 are, for example, O-rings. The sealing materials 43 and 44 are rubber annular members, for example.

Next, a connection structure between the terminal box 22 and the signal line 105 will be described with reference to FIG. Regarding the connection structure of the signal line 105, the same reference numerals are given to components common to the connection structure of the power line 101. The signal line 105 is a cable in which a plurality of thin core wires are bundled, and extends from the inverter 121 (see FIG. 1). The tip of the signal line 105 is formed with annular fixing rings 106 and 10.
7, through a through hole 23 formed in a part of the terminal box 22, and inserted into the terminal box 22. An internal thread is formed on the inner peripheral surface of the through-hole 23, and the outer peripheral surface at one end of the fixing ring 107 is fixed by being screwed. Then, the outer ring of the signal line 105 is supported and fixed to the fixing rings 106 and 107 by screwing the fixing ring 106 to the other end of the fixing ring 107. The fixing rings 106 and 107 prevent foreign matter from entering the second air chamber M from the outside of the terminal box 22 via the through hole 23.

As shown in FIG. 5, a box-shaped connector 34 is disposed in the second air chamber M that is inside the terminal box 22. One end surface of the connector 34 is connected to the tip of the signal line 105. The other end surface of the connector 34 is connected to one end of a signal conducting wire 35 extending from the motor chamber L. The connector 34 has a wall-shaped base 34b on the other end face side. The base 34 b is attached and fixed to the terminal box 22 by bolts 46. The wall-shaped base portion 34 b is disposed along the second partition wall 41 and blocks the air chamber M and the motor chamber L.

The signal conducting wire 35 is a second conductive member that extends from the motor chamber L to the second air chamber M and penetrates the second partition wall 41 and the wall-shaped base portion 34b. One end of the signal conductor 35 is connected to the back surface of the connector 34. The other end of the signal conducting wire 35 is connected to a rotation angle sensor 49 (see FIG. 3) installed inside the in-wheel motor drive device 11. The rotation angle sensor 49 is connected to the motor shaft 1
The rotation angle 4a is detected, and a signal corresponding to the rotation angle is output to the inverter 121. The flock-shaped partition wall 41 is attached and fixed to the terminal box 22 by bolts 45.

As shown in FIG. 5, the in-wheel motor drive device 11 of the present embodiment includes a second air chamber M into which a tip of a signal line 105 extending from the outside of the in-wheel motor drive device 11 is inserted, a motor chamber L, A non-conductive second partition wall 41 that partitions the second air chamber M, and a second partition wall 4
1 is a conductor extending across 1 and one end of which is disposed in the motor chamber L, and the rotation angle sensor 49
, And the other end of the signal conductor 3 is disposed in the second air chamber M and connected to the tip of the signal line 105.
5 is further provided. Thus, the partition wall 41 surrounds the outer periphery of the signal conducting wire 35 and is in close contact with the inner wall surface of the terminal box 22, thereby completely closing the annular space between the inner wall surface of the terminal box 22 and the outer periphery of the signal conducting wire 35. Therefore, the motor chamber L and the air chamber M are completely shut off. In addition, the motor chamber L and the air chamber M are completely blocked by the wall-shaped base 34b. The second air chamber M may be in communication with or separated from the air chamber M of the power line 101 shown in FIG.

Next, another embodiment of the present invention will be described. FIG. 6 is a longitudinal sectional view showing another embodiment of the present invention, and FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6 and viewed in the direction of the arrow. FIG. 8 is an external view of the terminal box as seen from the direction in which FIG. 7 is tilted slightly forward on the paper. The other embodiments shown in FIGS. 6 to 8 are basically the same as the embodiments shown in FIGS. 1 to 4 described above, and the shape and orientation of each member are different. Therefore, configurations common to the above-described embodiment are denoted by the same reference numerals, description thereof is omitted, and different configurations are described below. In another embodiment, as shown in FIG. 7 and FIG.
The connection points of are arranged in a lame pattern. And the tip metal terminal 10 further extended from the power line 101
2 and the conductive member 31 are crossed by 90 degrees and connected.

Therefore, the passage 27 extends in an L shape as shown in FIG. Three conductive members 31 having different lengths are used. Further, an insulator 47 as an insulator is interposed between the conductive members 31 and 31 that are adjacent and extend in parallel.

As shown in FIG. 8, a plate-like bracket 24 is individually provided in each through hole 23 arranged in a laminating manner. For this reason, in order to attach and fix the bracket 24 to the terminal box 22, three support portions 22b having a shape protruding from the outer wall surface of the terminal box 22 are provided, and each support portion 22b is provided.
Is formed with a female screw hole 22m (see FIG. 6). A bolt 24b for mounting and fixing the bracket 24 is screwed into each female screw hole 22m. As shown in FIGS. 6 to 8, it is understood that the partition wall 41 can be applied to the conductive members 31 having different lengths.

In the above-described embodiment, the radial gap motor is provided with the stator 13 fixed to the casing 22b on the motor part 11A and the rotor 12 arranged at a position facing the inner side of the stator 13 with a radial gap. Although the example which employ | adopted was shown, the motor of arbitrary structures is applicable not only to this but. For example, an axial gap motor in which the stator and the rotor are arranged to face each other via a gap opened in the axial direction may be used. Motor unit 11A
The motor employed in the above is preferably an embedded magnet type synchronous motor (that is, an IPM motor).

Furthermore, in the in-wheel motor drive device 11 according to the present invention, an example in which a cycloid type speed reducer is employed has been shown.
Other reduction gears can be applied, and a so-called direct motor type that does not employ a reduction gear may be used.

Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

The in-wheel motor drive device according to the present invention is advantageously used in electric vehicles and hybrid vehicles.

11 In-wheel motor drive device, 11A motor part, 11B reduction part, 11C hub part, 12 rotor, 13 stator, 14a motor shaft, 15, 16 bearing, 17 motor coil, 18, lead wire,
19 metal terminals, 21a, 21b casing, 22 terminal box,
22b support part, 22m female screw hole, 23 through hole, 24 bracket, 25 cover, 26 sealing material, 27 passage, 31
Conductive member, 31f flange portion, 32, 33 bolt, 41 partition wall, 42 through hole, 43, 44 sealing material, 47 insulator,
101 Power line, 102 Tip metal terminal, 103 Color, 1
05 signal line, 106, 107 fixing ring, 111 wheels, 112
Road wheel, 113 trailing arm, 121 inverter,
G annular gap, L motor chamber, M air chamber, S inner space region.

Claims (4)

Inside the in-wheel motor drive device lubricated by the lubricating oil;
An air chamber into which the tip of a power line extending from the outside of the in-wheel motor drive device is inserted;
A non-conductive partition wall arranged in a passage extending from the air chamber to the inside of the in-wheel motor driving device and partitioning the inside of the in-wheel motor driving device and the air chamber;
A conductor extending across the partition wall, one end of which is disposed inside the in-wheel motor drive device and connected to the motor coil, and the other end is disposed in the air chamber and connected to the tip of the power line A conductive member that ,
An in-wheel motor drive device comprising: an annular sealing material that surrounds the outer peripheral surface of the partition wall and contacts the inner peripheral surface of the passage . The inside of the in-wheel motor driving device and the air chamber are respectively defined by a casing of the in-wheel motor driving device,
The conductive member is inserted into the passageway to contact the in-wheel motor drive device inside said air chamber is formed in said casing,
The in-wheel motor drive device according to claim 1, wherein the non-conductive partition wall is a resin filled in a gap between an inner peripheral surface of the passage and an outer peripheral surface of the conductive member.   The in-wheel motor drive device according to claim 1, further comprising an annular sealing material that surrounds the outer peripheral surface of the conductive member and is embedded in the partition wall. A second air chamber into which the tip of a signal line extending from the outside of the in-wheel motor drive device is inserted;
A non-conductive second partition wall that partitions the inside of the in-wheel motor drive device and the second air chamber;
A conductor extending across the second partition wall, one end of which is disposed inside the in-wheel motor drive device and connected to the sensor, and the other end is disposed in the second air chamber and is connected to the signal line. The in-wheel motor drive device in any one of Claims 1-3 further provided with the 2nd electrically-conductive member connected with a front-end | tip.

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