JP2013115831A - Electric conductor protection structure of electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric conductor protection structure of an electric motor which inhibits the input of an external force acting on an external electric conductor, which is provided at a lower half region of the electric motor and is disposed extending from a housing that houses the electric motor, from the lower side and protects the external electric conductor.SOLUTION: An electric conductor protection structure of an electric motor includes: an electric motor 2 which is mounted on a vehicle 3 having a stator 14 and a rotor 15 that are housed in a case 11; and an outer connector 105 connected with a bus bar 130 and a conductive cable 103 connected with the outer connector 105 which extend from the case 11 at positions lower than a horizontal surface P passing a rotation axis x of the electric motor 2. A protection member 140, which covers the outer connector 105 and a lower surface of the conductive cable 103, is provided below the outer connector 105 and the conductive cable 103 in the vertical direction.

Description

  The present invention relates to an electric conductor protection structure for an electric motor, and more particularly to an electric conductor protection structure for an electric motor capable of protecting an external electric conductor of an electric motor arranged below a floor panel in an electric vehicle such as an electric vehicle or a hybrid vehicle. About.

  An electric vehicle such as an electric vehicle or a hybrid vehicle includes an electric motor for driving the vehicle, and a conductive cable that supplies electric power from a driving device to the electric motor is connected to the electric motor via a connector (for example, Patent Document 1).

  The wiring connection structure of the vehicle drive motor described in Patent Document 1 is provided with a soundproof structure so as to cover the surface of the connector attached to the housing of the motor on the vehicle compartment side. The soundproof structure includes a shielding plate and a sound absorbing member provided so as to face the surface of the connector on the passenger compartment side, and reduces noise generated by vibration.

JP 2007-74848 A

  By the way, in the vehicle in which the electric motor is arranged below the floor panel, when a connector is provided in the lower half region of the electric motor, there is a possibility that the input of external force from below acts on the connector and the subsequent cable. Connector and cable protection is desired. The wiring connection structure of the vehicle drive motor described in Patent Document 1 is intended to reduce noise by covering the surface of the connector on the passenger compartment side with a shielding plate and a sound absorbing member, and is intended to protect the connector and the cable. It was not something to do.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to suppress the input of external force acting from the lower side to the external electric conductor provided in the lower half region of the electric motor, An object of the present invention is to provide an electric conductor protection structure for an electric motor that can protect an electric conductor.

In order to achieve the above object, the invention according to claim 1
An electric motor main body having a stator (for example, stators 14A and 14B in an embodiment described later) and a rotor (for example, rotors 15A and 15B in an embodiment described later) arranged to be rotatable relative to the stator; ,
A housing (for example, a case 11 in an embodiment described later) for housing the electric motor main body;
An electric motor (for example, an electric motor 2A, 2B in an embodiment described later) mounted on a vehicle (for example, a vehicle 3 in an embodiment described later),
An external electrical conductor (for example, a bus bar 130 in an embodiment described later) that is electrically connected to the inside of the housing and arranged to extend from the housing to the outer surface of the housing. For example, outer connectors 105A and 105B and conductive cables 103A and 103B) in the embodiments described later,
An electric conductor protection structure for an electric motor comprising:
The external electric conductor extends from the housing below a horizontal plane (for example, a horizontal plane P in the embodiment described later) passing through a rotation axis of the electric motor (for example, a rotation axis x in the embodiment described later),
A protective member (for example, protective members 140A and 140B in the embodiments described later) that covers the lower surface of the external electrical conductor is provided below the external electrical conductor in the vertical direction.

In addition to the configuration of claim 1, the invention according to claim 2
The protective member has an inclined portion (for example, an inclined portion 144 in an embodiment described later) that extends in a direction away from the housing and inclines so that a vertical position on the distal side with respect to the housing is increased. It is characterized by that.

In addition to the structure of claim 2, the invention according to claim 3
The protective member has a communication structure that communicates the upper side and the lower side of the protective member on the proximal side with respect to the housing.

In addition to the configuration of claim 3, the invention according to claim 4
The communication structure has a gap (for example, a later-described embodiment) between a proximal end of the protective member with respect to the housing (for example, a proximal-side end 150 in a later-described embodiment) and the housing. The protective member is arranged so that there is a gap C).

In addition to the structure of any one of Claims 1-4, the invention which concerns on Claim 5 is
The protective member includes a bottom portion (for example, a bottom portion 142 in an embodiment described later) that covers the lower surface of the external electric conductor, and an upright portion (for example, a later-described portion) that extends vertically upward from an edge of the bottom portion. And an upright portion 143) according to the embodiment.

In addition to the structure of Claim 5, the invention according to Claim 6
The bottom portion of the protective member has a horizontal width on the distal side with respect to the housing (for example, a horizontal width W1 on the distal side in the embodiments described later), and a horizontal width on the proximal side (for example, described later It is characterized by having a reduced width part (for example, the reduced width part 145 in the below-mentioned embodiment) which reduces so that it may become narrower than the horizontal width W2 of the proximal side in embodiment.

In addition to the structure of any one of Claims 1-6, the invention which concerns on Claim 7 is
The protective member is formed separately from the housing and via a support member (for example, support members 160A and 160B in the embodiments described later) formed separately from the housing and the protective member. It is fixed to the housing.

In addition to the structure of claim 7, the invention according to claim 8
The support member extends above the external electric conductor from one side of the external electric conductor to the other side, and is fixed to the housing on the one side and the other side. To do.

In addition to the structure of any one of Claims 1-8, the invention which concerns on Claim 9 is
A lowermost part of the protective member (for example, a lowermost part 151 in an embodiment described later) is disposed at a position higher than a lowermost part of the housing (for example, a lowermost part 113a in an embodiment described later). To do.

In addition to the structure of any one of Claims 1-9, the invention which concerns on Claim 10 is
The electric motor is supported by a skeleton member of the vehicle (for example, a subframe 13 in an embodiment described later), and the external electrical conductor is disposed below the skeleton member.

In addition to the structure of any one of Claims 1-10, the invention which concerns on Claim 11 is
The electric motor is arranged below a floor panel of the vehicle (for example, a floor panel 171 in an embodiment described later).

In addition to the structure of any one of Claims 1-11, the invention which concerns on Claim 12 is
The vehicle further includes a rectifying member (for example, a rectifying member 170 in an embodiment described later) that extends in a substantially horizontal direction at a position lower than the lowermost portion of the electric motor and rectifies traveling wind that flows below the vehicle. ,
At least a part of the protective member is arranged so as not to overlap the rectifying member when viewed from below.

In addition to the structure of any one of Claims 1-12, the invention which concerns on Claim 13 is
In the vicinity of the external electrical conductor, an auxiliary machine (for example, an oil pump 70 in an embodiment described later) fixed to the external surface of the housing is disposed,
The protective member includes an auxiliary machine protection unit (for example, a coupler guard 148 in an embodiment described later) that extends from the protective member and covers the lower surface of the auxiliary machine.

  According to the first aspect of the invention, it is possible to protect the external electric conductor by suppressing the input of the external force acting on the external electric conductor provided in the lower half region of the electric motor from the lower side by the protective member. .

  According to invention of Claim 2, the foreign material which penetrate | invades into the upper side of a protection member from the distal side of a protection member can be suppressed. In addition, at the time of a collision or the like, input of an external force from the peripheral member from the distal side can be suppressed.

  According to the invention of claim 3, foreign matters such as pebbles and water that have entered the upper side of the protective member can be easily discharged, and the retention above the protective member is suppressed. Moreover, since the foreign matter which invaded moves to the proximal side by the inclination of the inclined portion, the foreign matter is more easily discharged from the communication structure.

  According to the invention of claim 4, the communication structure can be formed without making a hole in the protective member, and the strength of the protective member is improved. Moreover, since the contact part of the housing | casing used as a vibration source and a protection member reduces, transmission of the vibration to a protection member can be reduced.

  According to invention of Claim 5, the side of an external electric conductor can also be covered by an upright part, and the penetration | invasion of the foreign material from the side to the protection member inner side can be suppressed. Further, the strength is improved as compared with the case where the protective member is formed in a flat plate shape.

  According to the sixth aspect of the present invention, it is possible to make it difficult for foreign matter to enter the inside of the protective member because the bottom portion has the reduced width portion in a state where the side is covered with the standing portion.

  According to the invention of claim 7, the shape and thickness of the protective member can be formed in an appropriate shape without being restricted by the casing and the support member, and the protective member is disposed in an appropriate position. Can do.

  According to the eighth aspect of the present invention, the protective member can be reliably fixed to the housing by the supporting members fixed on both sides of the external electric conductor.

  According to the ninth aspect of the invention, the external force from below is received by the housing, and the input of the external force acting on the protection member is reduced.

  According to the invention of claim 10, access to the external electric conductor from the vehicle lower side is facilitated.

  According to the invention of claim 11, even when the electric motor is arranged under the floor, the external electric conductor can be easily accessed. In addition, the space for passengers on the floor and the loading space can be expanded, and the distance between the electric motor and the wheel can be reduced.

  According to the twelfth aspect of the present invention, the protective member and the external electric conductor can be easily accessed while the rectifying member is attached to the vehicle.

  According to the invention of claim 13, the auxiliary machine can be protected simultaneously by the protective member. In addition, the number of parts can be reduced as compared with the case where the external electric conductor and the protection member for the auxiliary machine are individually provided, and the attachment / detachment of the protection member can be simplified.

1 is a block diagram illustrating a schematic configuration of a hybrid vehicle to which an electric conductor protection structure for an electric motor according to an embodiment of the present invention is applied. It is a longitudinal cross-sectional view of the rear-wheel drive device which has an electric motor. FIG. 3 is an enlarged partial sectional view of an upper portion of the rear wheel drive device shown in FIG. 2. It is the perspective view which looked at the rear-wheel drive device supported with the support apparatus from diagonally forward and downward. It is the figure which removed the protective member and looked at the connector attached to the housing of the electric motor from the front. It is sectional drawing of the rear-wheel drive device along the VI-VI line of FIG. It is a perspective view which shows the connector and protection member which were attached to the housing of the electric motor. It is the figure which looked at the connector and protection member which were attached to the housing of the electric motor from the front. It is a side view of the protection member attached to the housing of an electric motor. It is the perspective view which looked at the protection member attached to the housing of the electric motor from back diagonally downward. It is a bottom view of the protection member attached to the housing of the electric motor. It is a bottom view of vehicles showing the state where an electric motor was attached via a subframe.

  Hereinafter, in the present embodiment, the electric conductor protection structure for an electric motor according to the present invention will be described as applied to a vehicle drive device having an electric motor as a drive source for driving wheels. In the following description, the case where the vehicle drive device is used for rear wheel drive will be described as an example, but it may be used for front wheel drive.

  A vehicle 3 shown in FIG. 1 is a hybrid vehicle having a drive device 6 (hereinafter referred to as a front wheel drive device) in which an internal combustion engine 4 and an electric motor 5 are connected in series at the front portion of the vehicle. While the power is transmitted to the front wheels Wf via the transmission 7, the drive device 1 (hereinafter, rear wheels) provided below the floor panel 171 at the rear of the vehicle separately from the front wheel drive device 6 (see FIG. 12). The power of the driving device is transmitted to the rear wheels Wr (RWr, LWr). The rear wheel drive device 1 includes first and second electric motors 2A and 2B. The power of the first electric motor 2A is transmitted to the left rear wheel LWr, and the power of the second electric motor 2B is transmitted to the right rear wheel RWr. The electric motor 5 of the front wheel drive device 6 and the first and second electric motors 2A and 2B of the rear wheel drive device 1 are connected to the battery 9 so that power supply from the battery 9 and energy regeneration to the battery 9 are possible. Yes. In FIG. 1, reference numeral 8 denotes a control device for controlling the entire vehicle.

  FIG. 2 is a longitudinal sectional view of the entire rear wheel drive device 1, and FIG. 3 is an enlarged partial sectional view of the upper part of FIG. A case 11 that is a housing of the rear wheel drive device 1 includes a central case 11M disposed substantially in the vehicle width direction (hereinafter also referred to as a left-right direction of the vehicle) and left and right sides of the central case 11M so as to sandwich the central case 11M. The left side case 11 </ b> A and the right side case 11 </ b> B are arranged in a substantially cylindrical shape. Inside the case 11 are axles 10A and 10B for the rear wheels Wr, first and second electric motors 2A and 2B for driving the axles, and first and second shifts for decelerating the driving rotation of the electric motors 2A and 2B. First and second planetary gear type speed reducers 12A and 12B as machines are arranged side by side on the same axis. The axle 10A, the first electric motor 2A and the first planetary gear speed reducer 12A drive and control the left rear wheel LWr, and the axle 10B, the second electric motor 2B and the second planetary gear speed reducer 12B drive the right rear wheel RWr. Control. The axle 10A, the first electric motor 2A and the first planetary gear speed reducer 12A, and the axle 10B, the second electric motor 2B and the second planetary gear speed reducer 12B are arranged symmetrically in the vehicle width direction in the case 11. Yes.

  The side cases 11A and 11B are respectively provided with partition walls 18A and 18B extending radially inward on the central case 11M side. Between the side cases 11A and 11B and the partition walls 18A and 18B, first and first partitions are provided. Two electric motors 2A and 2B are arranged. Further, first and second planetary gear speed reducers 12A and 12B are arranged in a space surrounded by the central case 11M and the partition walls 18A and 18B. As shown in FIG. 2, in this embodiment, the left side case 11A and the central case 11M constitute a first case 11L that houses the first electric motor 2A and the first planetary gear type speed reducer 12A. The right side case 11B and the central case 11M constitute a second case 11R that accommodates the second electric motor 2B and the second planetary gear speed reducer 12B. The first case 11L includes a left reservoir RL that stores oil as a liquid medium that is used for lubrication and / or cooling of at least one of the first electric motor 2A and the power transmission path, and the second case 11R includes The second electric motor 2B and the right storage part RR that stores oil used for lubrication and / or cooling of at least one of the power transmission paths are provided.

  The rear wheel drive device 1 is provided with a breather device 40 that communicates the inside and outside of the case 11 so that the air inside the case 11 escapes to the outside through the breather chamber 41 so that the air does not become excessively high temperature and pressure. Configured as follows. The breather chamber 41 is disposed at the upper part in the vertical direction of the case 11, and includes an outer wall of the central case 11M, a first cylindrical wall 43 extending substantially horizontally in the central case 11M on the left side case 11A side, and a right side case. A second cylindrical wall 44 extending substantially horizontally on the 11B side, a left and right dividing wall 45 connecting the inner ends of the first and second cylindrical walls 43, 44, and a left side case 11A of the first cylindrical wall 43. A space formed by a baffle plate 47A attached so as to abut on the side tip, and a baffle plate 47B attached so as to abut on the right side case 11B side tip of the second cylindrical wall 44. The

  The first and second cylindrical walls 43, 44 and the left and right dividing walls 45 that form the lower surface of the breather chamber 41 are such that the first cylindrical wall 43 is positioned radially inward from the second cylindrical wall 44, and the left and right dividing walls 45 are A third cylinder that extends from the inner end of the second cylindrical wall 44 to the inner end of the first cylindrical wall 43 while being bent while reducing the diameter, and further extends radially inward and extends substantially horizontally. Reach wall 46. The third cylindrical wall 46 is located on the inner side of both outer end portions of the first cylindrical wall 43 and the second cylindrical wall 44 and substantially in the center thereof.

  In the central case 11M, baffle plates 47A, 47B are planetary gear type in a space between the first cylindrical wall 43 and the outer wall of the central case 11M or a space between the second cylindrical wall 44 and the outer wall of the central case 11M. It is fixed so as to be separated from the speed reducer 12A or the planetary gear type speed reducer 12B.

  In addition, an external communication path 49 that connects the breather chamber 41 and the outside is connected to the central case 11M on the upper surface in the vertical direction of the breather chamber 41. The breather chamber side end portion 49a of the external communication passage 49 is arranged so as to be directed downward in the vertical direction. Accordingly, the oil is prevented from being discharged to the outside through the external communication passage 49.

  In the first and second motors 2A and 2B, the stators 14A and 14B are fixed to the side cases 11A and 11B, respectively, and annular rotors 15A and 15B are provided on the inner peripheral sides of the stators 14A and 14B with respect to the stators 14A and 14B. Are arranged so as to be relatively rotatable. Cylindrical shafts 16A and 16B surrounding the outer periphery of the axles 10A and 10B are coupled to the inner peripheral portions of the rotors 15A and 15B, and the cylindrical shafts 16A and 16B can be relatively rotated coaxially with the axles 10A and 10B. The side cases 11A and 11B are supported by end walls 17A and 17B and partition walls 18A and 18B via bearings 19A and 19B. Further, the rotation position information of the rotors 15A and 15B is fed back to the control controllers (not shown) of the electric motors 2A and 2B on the end walls 17A and 17B on the outer periphery on one end side of the cylindrical shafts 16A and 16B. Resolvers 20A and 20B are provided.

  The first and second planetary gear speed reducers 12A and 12B include sun gears 21A and 21B, a plurality of planetary gears 22A and 22B meshed with the sun gear 21, and planetary carriers 23A that support these planetary gears 22A and 22B. , 23B and ring gears 24A, 24B meshed with the outer peripheral sides of the planetary gears 22A, 22B. The driving forces of the electric motors 2A, 2B are input from the sun gears 21A, 21B, and the decelerated driving forces are transmitted to the planetary carrier 23A, It is output to the axles 10A and 10B through 23B.

  The sun gears 21A and 21B are formed integrally with the cylindrical shafts 16A and 16B. Further, the planetary gears 22A and 22B are double pinions having first pinions 26A and 26B having large diameters directly meshed with the sun gears 21A and 21B, and second pinions 27A and 27B having smaller diameters than the first pinions 26A and 26B. The first pinions 26A and 26B and the second pinions 27A and 27B are integrally formed in a state of being coaxial and offset in the axial direction. The planetary gears 22A and 22B are supported by the pinion shafts 32A and 32B of the planetary carriers 23A and 23B via needle bearings 31A and 31B, and the planetary carriers 23A and 23B have an axially inner end extending radially inward to the axle 10A. 10B and is supported by the partition walls 18A and 18B via bearings 33A and 33B.

  The ring gears 24A and 24B have gear portions 28A and 28B that are meshed with the second pinions 27A and 27B whose inner peripheral surfaces are small diameters, and small diameters that are smaller than the gear portions 28A and 28B and that are opposed to each other at an intermediate position of the case 11. Parts 29A, 29B, and connecting parts 30A, 30B for connecting the axially inner ends of the gear parts 28A, 28B and the axially outer ends of the small diameter parts 29A, 29B in the radial direction.

  The gear portions 28A and 28B face each other in the axial direction with a third cylindrical wall 46 formed at the inner diameter side end portion of the left and right dividing wall 45 of the central case 11M. The outer diameter surfaces of the small diameter portions 29A and 29B are spline-fitted to an inner race 51 of a one-way clutch 50, which will be described later, and the ring gears 24A and 24B are connected to each other so as to rotate integrally with the inner race 51 of the one-way clutch 50. Configured.

  On the planetary gear type speed reducer 12B side, between the second cylindrical wall 44 of the central case 11M constituting the case 11 and the gear portion 28B of the ring gear 24B, a hydraulic brake 60 constituting braking means for the ring gear 24B is provided. It arrange | positions so that it may overlap with the 1st pinion 26B in radial direction, and it may overlap with the 2nd pinion 27B in an axial direction. The hydraulic brake 60 includes a plurality of fixed plates 35 that are spline-fitted to the inner peripheral surface of the second cylindrical wall 44 and a plurality of rotary plates 36 that are spline-fitted to the outer peripheral surface of the gear portion 28B of the ring gear 24B. These plates 35 and 36 are arranged to be fastened and released by an annular piston 37. The piston 37 is accommodated in an annular cylinder chamber formed between the left and right dividing walls 45 of the central case 11M and the third cylindrical wall 46, and is further provided with a receiving provided on the outer peripheral surface of the third cylindrical wall 46. The elastic member 39 supported by the seat 38 is constantly urged in a direction to release the fixed plate 35 and the rotating plate 36.

  More specifically, the working chamber S into which oil is directly introduced is defined between the left and right dividing walls 45 and the piston 37, and when the pressure of the oil introduced into the working chamber S exceeds the urging force of the elastic member 39, The piston 37 moves forward (to the right), and the fixed plate 35 and the rotating plate 36 are pressed against each other and fastened. When the urging force of the elastic member 39 exceeds the pressure of the oil introduced into the working chamber S, the piston 37 moves backward (leftward movement), and the fixed plate 35 and the rotating plate 36 are separated and released. . The hydraulic brake 60 is connected to an oil pump 70 (see FIG. 4) described later.

  In the case of this hydraulic brake 60, the fixed plate 35 is supported by the second cylindrical wall 44 extending from the left and right dividing walls 45 of the central case 11M constituting the case 11, while the rotating plate 36 is supported by the gear portion 28B of the ring gear 24B. Therefore, when the plates 35 and 36 are pressed by the piston 37, a braking force is applied to the ring gear 24B by the frictional engagement between the plates 35 and 36, and is fixed. When the fastening by the piston 37 is released from this state, the ring gear 24B is allowed to rotate freely. As described above, since the ring gears 24A and 24B are connected to each other, the braking force is also applied to the ring gear 24A when the hydraulic brake 60 is fastened, and the ring gear 24A is fixed when the hydraulic brake 60 is released. Free rotation is allowed.

  Also, a space is secured between the coupling portions 30A and 30B of the ring gears 24A and 24B facing each other in the axial direction, and only power in one direction is transmitted to the ring gears 24A and 24B in the space to transmit power in the other direction. A one-way clutch 50 is arranged to be shut off. The one-way clutch 50 has a large number of sprags 53 interposed between an inner race 51 and an outer race 52. The inner race 51 is connected to the small diameter portions 29A, 29B of the ring gears 24A, 24B by spline fitting. It is configured to rotate integrally. The outer race 52 is positioned by the third cylindrical wall 46 and is prevented from rotating.

  The one-way clutch 50 is configured to engage and lock the rotation of the ring gears 24A and 24B when the vehicle 3 moves forward with the power of the electric motors 2A and 2B. More specifically, the one-way clutch 50 is engaged when rotational power in the forward direction on the motors 2A, 2B side (rotation direction when the vehicle 3 is advanced) is input to the wheel Wr side. When the rotational power in the reverse direction on the electric motors 2A and 2B is input to the wheels Wr, the non-engagement state is established, and when the rotational power in the forward direction on the wheels Wr is input to the electric motors 2A and 2B, it is not engaged. The engaged state is established when the rotating power in the reverse direction on the wheel Wr side is input to the electric motors 2A, 2B while being engaged.

  Further, as shown in FIG. 4, an oil pump 70 as an auxiliary machine is fixed to the front side surface 11f of the central case 11M. The oil pump 70 is, for example, a trochoid pump, which is driven by an electric motor (not shown) such as a position sensorless / brushless DC motor and sucks oil stored in the left and right reservoirs RL, RR, and the case 11 and axles 10A, 10B, etc. Each part is lubricated and cooled via lubrication flow paths 80A and 80B provided in each of the mechanical parts.

  Thus, in the rear wheel drive device 1 of the present embodiment, the one-way clutch 50 and the hydraulic brake 60 are provided in parallel on the power transmission path between the electric motors 2A, 2B and the wheels Wr. It should be noted that the hydraulic brake 60 is released, weakly engaged, or engaged by the pressure of oil supplied from the oil pump 70 according to the running state of the vehicle and the engaged / disengaged state of the one-way clutch 50. Be controlled. For example, when the vehicle 3 moves forward by powering drive of the electric motors 2A and 2B (at low vehicle speed and medium vehicle speed), the one-way clutch 50 is engaged, so that power can be transmitted but the hydraulic brake 60 is weakly engaged. Therefore, even when the input of forward rotational power from the motors 2A and 2B side temporarily decreases and the one-way clutch 50 is disengaged, the motors 2A and 2B Inability to transmit power to the wheel Wr side is suppressed. Further, when the vehicle 3 moves forward by power driving of the internal combustion engine 4 and / or the electric motor 5 (at the time of high vehicle speed), the one-way clutch 50 is disengaged and the hydraulic brake 60 is controlled to be in a released state, Over-rotation of the electric motors 2A and 2B is prevented. On the other hand, when the vehicle 3 moves backward or regenerates, the one-way clutch 50 is disengaged, so that the hydraulic brake 60 is controlled to be in the engaged state, so that the rotational power in the reverse direction from the electric motors 2A and 2B is changed to the wheels Wr. Or forward rotational power on the wheel Wr side is input to the electric motors 2A and 2B.

  As shown in FIGS. 4 and 12, the rear-wheel drive device 1 is supported by a subframe (frame member) 13 by mount members (support devices) 13 a and 13 b, and the floor panel of the vehicle 3 through the subframe 13. 171 is fixed below. Moreover, the rear-wheel drive device 1 mounts the mount members 13a and 13b on a boss portion (fixed portion) 11a (see FIG. 6) formed to protrude forward from the front side surface 11f of the case 11 (side cases 11A and 11B). By being fixed, it is supported by the vehicle 3.

  Also, a bus bar 130 that is an internal electrical conductor to which the three-phase wire of the stator coil 102 wound around the stator 14 is connected to the front side surface 11f of the left side case 11A and the right side case 11B, and an external device (not shown) The first and second connectors 101A and 101B are provided for electrically connecting the conductive cables 103A and 103B extending from the cable.

  The first and second connectors 101A and 101B are disposed near the lower portion of the boss portion 11a to which the mount members 13a and 13b are fixed, and in particular, are disposed below the horizontal plane P passing through the rotation axis x of the axles 10A and 10B. ing. Furthermore, at least a part of the first and second connectors 101A and 101B is arranged directly below the mount members 13a and 13b, that is, within the vertical projection of the mount members 13a and 13b. It is arranged directly below, that is, within the vertical projection of the subframe 13. As described above, since the mount members 13a and 13b and the subframe 13 are arranged so as to cover the upper sides of the first and second connectors 101A and 101B, the first and second connectors 101A and 101A against the fallen object from above. 101B is protected.

  Further, the first connector 101A and the second connector 101B are disposed in the vicinity of the oil pump 70 in the left-right direction so as to sandwich the oil pump 70 located at the center in the left-right direction of the front side surface 11f of the case 11. Therefore, the oil pump 70 is arranged so as not to be an obstacle when accessing the first connector 101A and the second connector 101B.

  Further, below the connectors 101A and 101B and the conductive cables 103A and 103B in the vertical direction, first and second protective members 140A and 140B for protecting the connectors 101A and 101B and the conductive cables 103A and 103B are supported by the support members 160A and 160B. 11 is fixed. In addition, since the rear-wheel drive device 1 is formed symmetrically with respect to the center in the left-right direction of the vehicle 3, in the following description, the second connector 101B positioned on the right side (left side in FIG. 4) and the second connector 101B 2 The structure of the protective member 140B will be described.

  Referring to FIG. 6, second connector 101B includes inner connector 104 that is fixed to case 11 and outer connector 105 that is provided at the distal end portion of conductive cable 103B. By connecting the inner and outer connectors 104 and 105 to each other, the bus bar 130 to which the wiring of each phase of the stator coil 102 wound around the stator 14B is connected and the conductive cable 103B are electrically connected. Is done. The outer connector 105 and the conductive cable 103B constitute an external electric conductor.

  The inner connector 104 has three conductor bodies 106 of U phase, V phase, and W phase, and a conductor holding portion 107 that holds each conductor body 106. The conductor holding portion 107 is attached to the case 11 at two bolts. It is attached to the case 11 by fastening and fixing at 108 (see FIG. 5). The case 11 is provided with a terminal block 131 in which three bus bars 130 of U phase, V phase, and W phase are disposed between the inner connector 104 and the stator 14. One end of each bus bar 130 is connected to each phase wiring extending from the stator coil 102, and the other end 130 a of each bus bar 130 is connected to each phase conductor body 106 of the inner connector 104. (Only one phase is shown in FIG. 6).

  On the lower surface of the case 11 on which the conductor main body 106 of the inner connector 104 is disposed, an opening 109 that connects the inside and the outside of the case 11 is formed. Therefore, when the inner connector 104 is attached to the case 11, the conductor body 106 is disposed so as to overlap the other end 130 a of the bus bar 130 in the vertical direction. Then, while visually recognizing the connection portion 132 between the other end 130a of the bus bar 130 of each phase and the conductor main body 106, a fastening tool (not shown) was inserted into the opening 109 from below and fixed to the bolt 110 and the conductor main body 106. The nut 111 is fastened and connected. Usually, the opening 109 is closed by a cover plate 112 fixed to the case 11 with a bolt 113.

  Then, after the outer connector 105 is fitted into the conductor holding portion 107 of the inner connector 104, the outer connector 105 is fixed by the bolt 115. Further, the lowermost portion of the second connector 101B, in this embodiment, the lowermost portion 105a of the outer connector 105 is higher by a height h than the lowermost portion 113a of the case 11, that is, the head of the bolt 113 that fixes the cover plate 112. It arrange | positions so that it may become a position (refer FIG. 6).

  The second protective member 140B is formed of a metal plate or the like so as to have a substantially U-shaped cross section, and includes a bottom portion 142 disposed below the second connector 101B and the conductive cable 103B, and a left and right end of the bottom portion 142 of the vehicle. And an upright portion 143 that rises upward from the edge in the vertical direction. As a result, the second connector 101B and the conductive cable 103B have their bottom surfaces covered with the bottom portion 142 and their both side surfaces covered with the upright portions 143, and are added to the second connector 101B and the conductive cable 103B from below. External force is suppressed.

  The second protective member 140B extends in a direction away from the case 11, that is, forward. The bottom portion 142 has an inclined portion 144 that inclines so that a vertical position on the distal side with respect to the case 11 from the bottom portion 142 gradually increases, and a horizontal width W1 on the distal side with respect to the case 11 has a horizontal direction on the proximal side. And a reduced width portion 145 that is reduced to be narrower than the width W2. Since the second protective member 140B has a height on the distal side due to the inclined portion 144, it is difficult for stones, water, and the like to jump up during traveling. Moreover, since the space | interval of the both standing part 143 of the 2nd protection member 140B becomes narrow with the reduced width part 145, similarly, the stone and water which jump up at the time of driving | running | working cannot enter easily.

  The second protective member 140B is bent and formed at right angles from the extending portion 146 that extends rearward from the right standing portion 143 that is the outer side in the left and right direction of the vehicle, and the left standing portion 143 that is the inner side in the left and right direction. And a rib 147 (see FIG. 8) extending toward. The extending portion 146 is fixed to the right side surface of the case 11 with a bolt 155 (see FIG. 9), and the rib 147 is fixed to the front side surface 11f of the case 11 with a bolt 156 (see FIG. 8). Further, as shown in FIG. 8, the second protective member 140B has a coupler guard 148 that is an auxiliary device protection portion extending inward in the left-right direction of the vehicle so as to cover the lower portion of the wiring coupler 71 of the oil pump 70. The wiring coupler 71 is protected by a coupler guard 148.

As shown in FIG. 9, the second protection member 140 </ b> B is arranged such that a gap C is provided between the case 11 and the proximal side end portion 150 with respect to the case 11, and the second protection member 140 </ b> B is disposed through the gap C. 2 The upper and lower sides of the protective member 140B communicate with each other. Thereby, the foreign matter that has entered the upper side of the second protective member 140B during traveling or the like is easily discharged and removed from the gap C.
Instead of providing the gap C between the second protective member 140B and the case 11, a through hole is provided in the bottom portion 142 to allow the upper and lower sides of the second protective member 140B to communicate with each other and enter the upper side of the second protective member 140B. Foreign matter may be discharged from the through hole.

  Further, the lowermost portion 151 of the second protective member 140B is also disposed at a position higher than the lowermost portion 113a of the case 11, and an external force is less likely to act on the second protective member 140B (see FIG. 9).

  The support member 160B is formed into a substantially U shape by press-molding a metal plate so as to extend over the second connector 101B and the conductive cable 103B from one side to the other side in the left-right direction of the vehicle. Is formed. The support member 160B has a rear end portion 161 arranged on one side (right side in FIG. 8) of the second connector 101B, and the extension portion 146 of the second protection member 140B and the case 11 Above the fixing position, it is fixed to the right side surface of the case 11 with a bolt 166 (see FIG. 9). The other end 162 of the support member 160B is disposed on the other side (left side in FIG. 8) of the second connector 101B, and is screwed to the front side surface 11f of the case 11 with a bolt 167.

  Also, as shown in FIG. 9, the support portion 163 that extends downward from the one end portion 161 side of the support member 160B and is formed in a substantially L shape extends upward from the upright portion 143 of the second protection member 140B. The mounting portion 149 and the bolt 164 are fixed. As a result, the support member 160B is disposed so as to straddle the second connector 101B and the conductive cable 103A, and is fixed to the case 11 at two locations. The second protective member 140B is fixed to the case 11 at a total of three locations that are fixed via the support member 160B and two locations on the right side surface and the front side surface 11f of the case 11.

  As shown in FIG. 12, the rear wheel drive device 1 fixed below the floor panel 171 of the vehicle 3 via the subframe 13 rectifies traveling wind flowing below the vehicle 3 at the lower part of the floor panel 171. Therefore, it is disposed behind the rectifying member 170 and the heat shield 172 that covers the exhaust pipe (not shown) from the engine. The first and second protection members 140A and 140B are arranged so as not to overlap the rectifying member 170 when viewed from below, while at least a part of the first and second protection members 140A and 140B is viewed from below. As seen, the heat shield plate 172 is disposed so as to overlap.

  As described above, according to the electric conductor protection structure of the electric motor according to the present embodiment, the electric motors 2A, 2B mounted on the vehicle 3 having the stators 14A, 14B and the rotors 15A, 15B accommodated in the case 11 and And outer connectors 105A and 105B and conductive cables 103A and 103B (external electrical conductors) that are connected to the bus bar 130 inside the case 11 and extend from the case 11, and have the outer connectors 105A and 105B and the conductive cable 103A. , 103B extend from the case 11 below the horizontal plane P passing through the rotation axis x of the motors 2A, 2B, and the outer connectors 105A, 105B and the conductive cables 103A, 103B have an outer connector 105A. , 105B and the protective part covering the lower surfaces of the conductive cables 103A, 103B 140A, since 140B are provided, it is possible to protect the protective member 140A, the outer connector 105A by 140B, 105B and conductive cables 103A, by suppressing the input of the external force acting on the 103B.

  Since the protection members 140A and 140B have an inclined portion 144 that extends in a direction away from the case 11 and inclines so that the vertical position on the distal side with respect to the case 11 becomes higher, the protection members 140A and 140B from the distal side. It is possible to suppress foreign matter that enters the upper side of the. In addition, at the time of a collision or the like, input of an external force from the peripheral member from the distal side can be suppressed.

  Since the protection members 140A and 140B have a communication structure that communicates the upper and lower sides of the protection members 140A and 140B on the proximal side with respect to the case 11, pebbles, water, and the like that have entered the upper side of the protection members 140A and 140B. Foreign matter can be easily discharged and retention is suppressed. Moreover, since the foreign matter which invaded moves to the proximal side by the inclination of the inclined portion 144, the foreign matter is more easily discharged from the communication structure.

  Since the communication structure is formed by disposing the protection members 140A and 140B such that there is a gap C between the case 11 and the proximal end portion 150 of the protection members 140A and 140B with respect to the case 11, the protection structure is protected. A communication structure can be formed without making holes in the members 140A and 140B, and the strength of the protective members 140A and 140B is improved. Moreover, since the contact part of case 11 used as a vibration source and protection member 140A, 140B reduces, transmission of the vibration to protection member 140A, 140B can be reduced.

  The protection members 140A and 140B include a bottom portion 142 that covers the lower surfaces of the outer connectors 105A and 105B and the conductive cables 103A and 103B, and an upright portion 143 that extends upward in the vertical direction from the edge of the bottom portion 142. Therefore, the side portions of the outer connectors 105A and 105B and the conductive cables 103A and 103B can be covered by the upright portion 143, and entry of foreign matter from the side into the protective members 140A and 140B can be suppressed. Further, the strength is improved as compared with the case where the protective members 140A and 140B are formed in a flat plate shape.

  Since the bottom 142 of the protection members 140A and 140B has a reduced width portion 145 that is reduced so that the horizontal width W1 on the distal side with respect to the case 11 is narrower than the horizontal width W2 on the proximal side, the upright portion 143 is provided. When the bottom portion 142 has the reduced width portion 145 in the state where the sides are covered, foreign matters are less likely to enter the protective members 140A and 140B.

  The protective members 140A and 140B are formed separately from the case 11 and are fixed to the case 11 via the support members 160A and 160B formed separately from the case 11 and the protective members 140A and 140B. In addition, the shape and thickness of the protection members 140A and 140B can be formed in an appropriate shape without being restricted by the support members 160A and 160B, and the protection members 140A and 140B can be arranged at appropriate positions. .

  The support members 160A and 160B extend upward from one side to the other side of the outer connectors 105A and 105B and the conductive cables 103A and 103B, and are fixed to the case 11 on one side and the other side. The protective members 140A and 140B can be securely fixed to the case 11 by 160A and 160B.

  Since the lowermost part 151 of the protection members 140A and 140B is disposed at a position higher than the lowermost part 113a of the case 11, an external force from below is received by the case 11 and an external force acting on the protection members 140A and 140B is input. Is reduced.

  Since the outer connectors 105A and 105B and the conductive cables 103A and 103B are disposed below the floor panel 171 that supports the electric motors 2A and 2B, the outer connectors 105A and 105B and the conductive cables 103A and 103B are provided from the lower side of the vehicle 3. Easy access.

  Since the electric motors 2A and 2B are arranged below the floor panel 171 of the vehicle 3, the outer connectors 105A and 105B and the conductive cables 103A and 103B can be easily accessed even when the electric motors 2A and 2B are arranged below the floor. Become. In addition, the occupant living space / loading space on the floor is increased, and the distance between the electric motors 2A, 2B and the wheels Wr can be reduced.

A rectifying member 170 that rectifies traveling wind flowing under the vehicle 3 is disposed in a substantially horizontal direction at a position lower than the lowermost portion 113a of the electric motors 2A and 2B, and the protection members 140A and 140B are rectifying members as viewed from below. Since it is arranged so as not to overlap with 170, the protection members 140A and 140B, the outer connectors 105A and 105B, and the conductive cables 103A and 103B can be easily accessed while the rectifying member 170 is attached to the vehicle 3.
As long as the protective members 140A and 140B can be removed with the rectifying member 170 attached, the protective members 140A and 140B and the rectifying member 170 may partially overlap.

  An oil pump 70 fixed to the outer surface of the case 11 is disposed in the vicinity of the outer connectors 105A and 105B and the conductive cables 103A and 103B. The protective members 140A and 140B extend from the protective members 140A and 140B and are oil Since the coupler guard 148 that covers the lower surface of the wiring coupler 71 of the pump 70 is provided, the wiring coupler 71 can be simultaneously protected by the protection members 140A and 140B. In addition, the number of parts can be reduced and the attachment / detachment of the protection members 140A and 140B can be simplified as compared with the case where the protection members for the outer connectors 105A and 105B and the conductive cables 103A and 103B and the oil pump 70 are individually provided. Can do.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, in the present embodiment, a hybrid vehicle has been described as an applicable vehicle. However, the present invention is not limited to this, and may be, for example, an electric vehicle using only a motor as a drive source.

  In this embodiment, mount members 13a and 13b fixed to the case 11 and the subframe 13 are applied as support devices for supporting the electric motors 2A and 2B to the subframe 13, but the present invention is not limited to this. Not. For example, the support device may include a bracket member between the mount member and the skeleton member, and may be configured by the mount member and the bracket member. Further, the case 11 may not include the boss portion 11a as in the present embodiment, and the mount members 13a and 13b may be fixed to the flat portion of the front side surface 11f.

Further, the auxiliary machine of the present invention is not limited to the oil pump 70 of the present embodiment, and may be an air conditioner compressor, a water pump, or the like.
Furthermore, in this embodiment, the conductive cables 103A and 103B are connected to the internal electric conductor in the case 11 using the connectors 101A and 101B. However, the conductive cables 103A and 103B are directly connected to the internal electric conductor. It may be.

In the present embodiment, the two electric motors 2A and 2B are accommodated in one case 11, but the present invention is not limited to this, and separate cases may be provided and accommodated in the respective cases.
Furthermore, in the present embodiment, the motors 2A, 2B and the left and right rear wheels LWr, RWr are connected via the first and second transmissions, respectively, but the present invention is not limited to this, and the motors 2A, 2B The left and right rear wheels LWr and RWr may be directly connected.
In addition, in the present embodiment, the electric motors 2A and 2B are mechanically connected to the left and right rear wheels LWr and RWr so that power can be transmitted. However, the present invention is not limited to this and is applied to a power generation dedicated motor or the like. May be.

2 Electric motor 2A 1st electric motor (left electric motor)
2B Second motor (right motor)
3 Vehicle 11 Case (housing)
13 Subframe (Frame member)
14A, 14B Stator (stator)
15A, 15B Rotor (rotor)
70 Oil pump (auxiliary machine)
101A, 101B Connector 103A, 103B Conductive cable (external electrical conductor)
104 Inner connector 105 Outer connector (external electrical conductor)
113a Lowermost part of housing 130 Bus bar (internal electrical conductor)
140A, 140B Protection member 142 Bottom portion 143 Standing portion 144 Inclined portion 145 Reduced portion 148 Coupler guard (auxiliary device protection portion)
150 Proximal end portion 151 Lowermost part 160A, 160B of protective member Support member 170 Rectifier member 171 Floor panel C Clearance P Horizontal plane W1 Horizontal width W2 on the distal side Horizontal width x on the proximal side x Rotation axis

Claims (13)

An electric motor body having a stator and a rotor arranged to be rotatable relative to the stator;
A housing for housing the electric motor body;
An electric motor mounted on a vehicle,
An external electrical conductor that is electrically connected to an internal electrical conductor inside the housing and arranged to extend from the housing to an external surface of the housing;
An electric conductor protection structure for an electric motor comprising:
The external electric conductor extends from the housing below a horizontal plane passing through the rotation axis of the electric motor,
An electric conductor protection structure for an electric motor, wherein a protective member that covers a lower surface of the external electric conductor is provided below the outer electric conductor in the vertical direction.   2. The electric motor according to claim 1, wherein the protection member has an inclined portion that extends in a direction away from the housing and inclines so that a vertical position on a distal side with respect to the housing is increased. Electrical conductor protection structure.   The electric conductor protection structure for an electric motor according to claim 2, wherein the protection member has a communication structure that communicates the upper side and the lower side of the protection member on a proximal side with respect to the housing.   The communication structure is formed by disposing the protection member such that a gap exists between the proximal end of the protection member with respect to the housing and the housing. Item 4. An electric conductor protective structure for an electric motor according to Item 3.   The said protection member has the bottom part which covers the lower surface of the said external electric conductor, and the standing part extended toward the perpendicular direction upward from the edge of this bottom part, The any one of Claims 1-4 characterized by the above-mentioned. An electric conductor protection structure for an electric motor according to claim 1.   The said bottom part of the said protection member has a width reduction part reduced so that the horizontal direction width of the distal side with respect to the said housing | casing may become narrower than the horizontal direction width of a proximal side. The electric conductor protective structure of the described electric motor.   The protective member is formed separately from the housing and fixed to the housing via a support member formed separately from the housing and the protective member. The electric conductor protective structure for an electric motor according to any one of 1 to 6.   The support member extends above the external electric conductor from one side of the external electric conductor to the other side, and is fixed to the housing on the one side and the other side. The electric conductor protective structure for an electric motor according to claim 7.   The electric conductor protection structure for an electric motor according to any one of claims 1 to 8, wherein the lowermost part of the protective member is disposed at a position higher than the lowermost part of the housing.   10. The electric conductor protection for an electric motor according to claim 1, wherein the electric motor is supported by a skeleton member of the vehicle, and the external electric conductor is disposed below the skeleton member. Construction.   The electric conductor protection structure for an electric motor according to any one of claims 1 to 10, wherein the electric motor is arranged below a floor panel of the vehicle. The vehicle further includes a rectifying member that extends in a substantially horizontal direction at a position lower than a lowermost portion of the electric motor and rectifies traveling wind flowing under the vehicle,
The electric conductor protection structure for an electric motor according to any one of claims 1 to 11, wherein at least a part of the protection member is disposed so as not to overlap the rectifying member when viewed from below. . In the vicinity of the external electrical conductor, an auxiliary machine fixed to the external surface of the housing is disposed,
The electric conductor protection structure for an electric motor according to any one of claims 1 to 12, wherein the protective member includes an auxiliary device protection portion that extends from the protective member and covers a lower surface of the auxiliary device.

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