JP2015123890A - Electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric motor capable of suppressing infiltration of water into a housing.SOLUTION: A case 11 includes: Axle insertion holes 82 into which axles 10A, 10B are inserted; and connector insertion holes into which connectors electrically connected to a resolver stator 93 are inserted. The axles 10A, 10B are mechanically connected to a rotor 15A of a first electric motor 2A, and a rotor 15B of a second electric motor 2B, respectively. The axle insertion holes 82 and the connection insertion holes are formed on right and left end surfaces 80A, 80B which are surfaces of the case 11 facing a horizontal direction, and the connector insertion holes are formed at higher position than the axle insertion holes 82 in a vertical direction.

Description

  The present invention relates to an electric motor.

  An electric vehicle such as an electric vehicle or a hybrid vehicle is equipped with an electric motor including an electric motor body for driving the vehicle and a rotational state quantity detection device such as a resolver, and the rotational state quantity of the electric motor body is detected by the rotational state quantity detection device. ing.

  For example, in the electric vehicle described in Patent Document 1, two electric motor main bodies are provided in the rear wheel drive device, and a resolver rotor is provided on a cylindrical shaft that rotates integrally with the rotor of each electric motor main body. A resolver stator is provided on the part wall so as to face the resolver rotor.

JP 2010-235051 A

  Since the resolver stator is connected to the control controller, it is necessary to provide a hole in the housing that accommodates the electric motor body and expose the connector from the hole. However, in the vehicle drive device described in Patent Document 1, it is not described how to arrange the hole through which the connector of the resolver stator is inserted, and the water and the position of the hole through which the connector is inserted must be taken into consideration. There was a risk that it would be easier to penetrate.

  This invention is made | formed in view of the said subject, and it aims at providing the electric motor which can suppress permeation of the water into the inside of a housing | casing.

In order to achieve the above object, the invention described in claim 1
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) disposed so as to be relatively rotatable with respect to the stator. An electric motor main body (for example, first and second electric motor main bodies 2A and 2B in the embodiments described later);
A housing (for example, a case 11 in an embodiment described later) for housing the electric motor main body;
An object to be detected (for example, a resolver rotor 90 in an embodiment described later) installed on the rotor or a rotating body that rotates in conjunction with the rotor (for example, cylindrical shafts 16A, 16B in an embodiment described later); A rotation state amount detection device (for example, a resolver 20A according to an embodiment described later) having a detector (for example, a resolver stator 93 according to an embodiment described later) disposed in the housing and detecting a rotation state of the detection target. 20B), and an electric motor (for example, a rear wheel drive device 1 according to an embodiment described later),
The housing has an output shaft insertion hole (for example, an axle insertion hole 82 of an embodiment described later) through which an output shaft (for example, axles 10A, 10B of the embodiment described later) is mechanically connected to the rotor. And a connection conductor insertion hole (for example, a connector insertion hole 84 in an embodiment described later) through which a connection conductor (for example, a connector 94 in an embodiment described later) electrically connected to the detector is inserted. ,
The output shaft insertion hole and the connection conductor insertion hole are formed on a surface facing the horizontal direction of the casing (for example, left and right end surfaces 80A and 80B in the embodiments described later), and the connection conductor insertion hole is formed on the output shaft. It is formed at a position higher in the vertical direction than the insertion hole.

Moreover, in addition to the structure of Claim 1, the invention of Claim 2 is
The housing is formed so as to extend from below the connection conductor insertion hole, and has an extension portion (for example, a rib 85 in an embodiment described later) that covers the lower surface of the connection conductor.

Moreover, in addition to the structure of Claim 2, the invention of Claim 3 is
The casing is formed so as to extend in a cylindrical shape from the periphery of the output shaft insertion hole, and has a cylindrical wall portion (for example, a cylindrical wall portion 81 in an embodiment described later) surrounding the outer periphery of the output shaft. And
The extending portion is formed across the surface of the casing facing the horizontal direction and the cylindrical wall portion.

Moreover, in addition to the structure of Claim 3, the invention of Claim 4 adds to the structure of Claim 3,
At least a part of the connection conductor insertion hole is formed at a position lower than a vertical uppermost portion of the cylindrical wall portion.

Moreover, in addition to the structure of any one of Claims 1-4, invention of Claim 5 is provided,
A liquid medium flow path (for example, an embodiment described later) flows on a surface facing the horizontal direction of the casing through which a liquid medium (for example, an oil according to an embodiment described later) flows for cooling or lubrication of the electric motor body. An oil flow path 76) is formed,
The connection conductor insertion hole is formed at a position lower in the vertical direction than the liquid medium flow path.

Moreover, in addition to the structure of any one of Claims 1-5, the invention of Claim 6 is
The electric motor is mounted on a vehicle (for example, a vehicle 3 in an embodiment described later),
The connection conductor insertion hole is formed on a rear side in the front-rear direction of the vehicle with respect to a vertical plane passing through the rotation axis of the output shaft (for example, a vertical plane y in an embodiment described later).

Moreover, in addition to the structure of any one of Claims 1-6, invention of Claim 7 is provided,
The electric motor is mounted on a vehicle (for example, a vehicle 3 in an embodiment described later),
The electric motor is disposed below a floor panel of the vehicle.

  According to the first aspect of the present invention, since the two insertion holes of the output shaft insertion hole and the connection conductor insertion hole are formed on the surface facing the horizontal direction, the intrusion of water into both the insertion holes can be suppressed. Moreover, since the connection conductor insertion hole in which two water penetration holes are desired to be prevented is formed at a position higher than the output shaft insertion hole, the detector of the rotation state quantity detection device can be more reliably protected.

  According to the second aspect of the present invention, it is possible to further suppress the intrusion of water into the connection conductor insertion hole from below by the extending portion, and further to protect the connection conductor from foreign matters such as stepping stones.

  According to invention of Claim 3, the rigidity and intensity | strength of an extension part improve.

  According to the fourth aspect of the present invention, since the connection conductor is surrounded by the three elements of the surface facing the horizontal direction, the extension portion, and the cylindrical wall portion, the connection conductor can be further protected from foreign matters such as water.

  According to the fifth aspect of the present invention, the liquid medium flow path can be formed at a higher position, and the electric motor main body can be cooled or lubricated more effectively.

  According to the sixth aspect of the present invention, it is possible to suppress intrusion of water from the front while traveling.

  According to the seventh aspect of the present invention, it is possible to expand the passenger living space / loading space on the floor and reduce the distance between the electric motor and the wheel.

It is a block diagram showing a schematic structure of a hybrid vehicle which is one embodiment in which the electric motor of the present invention can be mounted. It is a longitudinal cross-sectional view of a rear-wheel drive device. FIG. 3 is an enlarged cross-sectional view of an upper portion of the rear wheel drive device shown in FIG. 2. It is the external appearance perspective view which looked at the rear-wheel drive device shown in FIG. 2 from the front and diagonally upward. FIG. 3 is a partial perspective view of a right end portion of the rear wheel drive device shown in FIG. FIG. 3 is a side view of a right end portion of the rear wheel drive device shown in FIG. 2. It is the figure which looked at the state where the resolver stator was fixed to the end wall from the inside of the case. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG.

Hereinafter, a hybrid vehicle will be described as an example of a vehicle on which the electric motor of this embodiment can be mounted.
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 power is transmitted to the front wheels Wf via the transmission 7, a drive device 1 (hereinafter referred to as a rear wheel drive device) provided below the floor panel (not shown) at the rear of the vehicle separately from the front wheel drive device 6. Is transmitted to the rear wheels Wr (RWr, LWr). The rear wheel drive device 1 includes first and second electric motor bodies 2A and 2B. The power of the first electric motor body 2A is transmitted to the left rear wheel LWr, and the power of the second electric motor body 2B is transmitted to the right rear wheel RWr. Is done. The electric motor 5 of the front wheel drive device 6 and the first and second electric motor main bodies 2A, 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 can be performed. ing.

  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, the axles 10A and 10B for the rear wheels Wr, the first and second electric motor bodies 2A and 2B for driving the axle, and the drive rotation of the first and second electric motor bodies 2A and 2B are decelerated. The first and second planetary gear type speed reducers 12A and 12B are arranged side by side on the same rotation axis x. The axle 10A, the first electric motor main body 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 main body 2B and the second planetary gear speed reducer 12B are the right rear wheel RWr. Is controlled. The axle 10A, the first electric motor main body 2A and the first planetary gear speed reducer 12A, and the axle 10B, the second electric motor main body 2B and the second planetary gear speed reducer 12B are arranged symmetrically in the vehicle width direction in the case 11. Has been.

  Partition walls 18A and 18B extending radially inward are provided on the center case 11M side of the left and right side cases 11A and 11B, respectively, and the end walls 17A and 17B and the partition walls 18A and 18B of the left and right side cases 11A and 11B are provided. Between the first and second electric motor bodies 2A and 2B, respectively. 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 the present embodiment, the left side case 11A and the central case 11M constitute a first case 11L that houses the first motor body 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 houses the second electric motor main body 2B and the second planetary gear type 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 main body 2A and the power transmission path, and the second case 11R. Has a right reservoir RR that stores oil for lubrication and / or cooling of at least one of the second electric motor main body 2B and the power transmission path.

  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 and 47B are provided in the space between the first cylindrical wall 43 and the outer wall of the central case 11M or the space between the second cylindrical wall 44 and the outer wall of the central case 11M as the first planet. It is fixed so as to be separated from the gear type speed reducer 12A or the second 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 electric motor bodies 2A and 2B, the stators 14A and 14B are fixed to the left and right 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. It is arrange | positioned so that relative rotation is possible. 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 left and right cases 11A and 11B are supported by end walls 17A and 17B and partition walls 18A and 18B via bearings 19A and 19B.

  A cylindrical wall portion 81 that surrounds the axles 10A and 10B disposed on the inner peripheral portions of the cylindrical shafts 16A and 16B so as to be rotatable relative to the inner peripheral portions of the cylindrical shafts 16A and 16B. Is extended. A resolver rotor 90 as a detector is attached to one end side of the cylindrical shafts 16A and 16B, and a resolver stator 93 as a detector for detecting the rotation state of the resolver rotor 90 is attached to the end walls 17A and 17B. Is attached so as to face the outer diameter side of the resolver rotor 90. The resolver rotor 90 and the resolver stator 93 constitute resolvers 20A and 20B. The resolvers 20A and 20B have the rotational state quantities of the rotors 15A and 15B such as the rotation angle, the angular velocity, the rotation speed, and the like in the first and second electric motor main bodies 2A, This is fed back to the 2B controller (not shown). The resolver rotor 90 and the rotors 15A, 15B of the first and second electric motor bodies 2A, 2B and the axles 10A, 10B provided on the cylindrical shafts 16A, 16B are the first and second planetary gear type reduction gears as will be described later. Since it is mechanically connected via the machines 12A and 12B, the wheel speed can also be calculated from the rotational state quantity and gear ratio of the rotors 15A and 15B. The resolvers 20 </ b> A and 20 </ b> B are elements constituting the electric motor together with the first and second electric motor main bodies 2 </ b> A and 2 </ b> B and the case 11.

  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 and 23B that support the planetary gears 22A and 22B. And ring gears 24A and 24B meshed with the outer peripheral sides of the planetary gears 22A and 22B. The driving forces of the first and second electric motor bodies 2A and 2B are input from the sun gears 21A and 21B, and the reduced driving force is received. It is output to the axles 10A and 10B through the planetary carriers 23A and 23B.

  The sun gears 21A and 21B are formed integrally with the cylindrical shafts 16A and 16B. 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 second 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 constituting braking means for the ring gear 24B 60 is arranged so as to overlap with the first pinion 26B in the radial direction and overlap with the second pinion 27B in the 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).

  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 first and second electric motor bodies 2A and 2B. More specifically, in the one-way clutch 50, rotational power in the forward direction (rotation direction when the vehicle 3 is advanced) on the first and second electric motor bodies 2A, 2B side is input to the rear wheel Wr side. When the rotational power in the reverse direction on the first and second electric motor main bodies 2A, 2B side is input to the rear wheel Wr side, the engagement state is reached and the forward direction on the rear wheel Wr side is sometimes reached. When the rotational power is input to the first and second electric motor bodies 2A, 2B, the disengaged state is established, and the reverse rotational power on the rear wheel Wr side is directed to the first and second electric motor bodies 2A, 2B. When input, it is in an engaged state.

  Moreover, as shown in FIG. 4, the oil pump 70 which is an auxiliary machine is being fixed to the front side surface 11c of the center 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 a lubrication flow path provided in each mechanism component, for example, an oil flow path 76 described later.

  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 first and second electric motor bodies 2A, 2B and the rear wheel Wr. Yes. 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 driving of the first and second electric motor main bodies 2A and 2B (at low vehicle speed and medium vehicle speed), the one-way clutch 50 is engaged, so that power transmission is possible. By controlling the brake 60 in the weakly engaged state, the input of the forward rotational power from the first and second electric motor main bodies 2A, 2B side temporarily decreases, and the one-way clutch 50 is in the non-engaged state. Even in this case, it becomes possible to prevent power transmission from being disabled between the first and second electric motor main bodies 2A and 2B and the rear wheel Wr. 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 first and second electric motor bodies 2A and 2B is prevented. On the other hand, when the vehicle 3 is moving backward or regenerating, the one-way clutch 50 is disengaged, so that the hydraulic brake 60 is controlled to be in the engaged state, so that the reverse direction from the first and second electric motor main bodies 2A and 2B side. Is output to the rear wheel Wr side, or forward rotational power on the rear wheel Wr side is input to the first and second electric motor main bodies 2A and 2B.

Here, the mounting structure of the resolvers 20A and 20B will be described in detail with reference to FIGS.
As shown in FIGS. 4 to 6, left and right end faces 80A and 80B extending annularly in the vertical direction and in the front-rear direction around the rotation axis x are formed on the end walls 17A and 17B of the left and right side cases 11A and 11B, It is provided so as to face the vehicle width direction of the vehicle 3 (that is, the left-right direction (horizontal direction)), and the cylindrical wall portion 81 extends from the left and right end faces 80A, 80B around the rotation axis x. An axle insertion hole 82 is formed inside the cylindrical wall portion 81, and the axles 10 </ b> A and 10 </ b> B disposed so as to be rotatable relative to the inner peripheral portions of the cylindrical shafts 16 </ b> A and 16 </ b> B are inserted into the axle insertion hole 82. Since the left and right end faces 80A and 80B of the end walls 17A and 17B and the resolvers 20A and 20B attached to the end walls 17A and 17B have the same configuration, in the following description, the right end face 80B of the right end wall 17B. Only the resolver 20B will be described, and description of the left end surface 80A of the left end wall 17A and the resolver 20A will be omitted.

  In the right end surface 80B, in addition to the axle insertion hole 82, a connector insertion hole 84 is formed at a position higher in the vertical direction than the axle insertion hole 82 and adjacent to the cylindrical wall portion 81 on the rear side of the vehicle 3. Has been. The comparison target of the height in the vertical direction is the center of the axle insertion hole 82, that is, the rotation axis x and the center of the connector insertion hole 84, and the center of the connector insertion hole 84 is the center of the axle insertion hole 82. It is formed at a position higher than x. Further, the uppermost portion in the vertical direction of the connector insertion hole 84 is formed at the same height as the uppermost portion in the vertical direction of the tubular wall portion 81 or at a position lower than the uppermost portion in the vertical direction of the tubular wall portion 81. Most of 84 is formed at a position lower than the uppermost vertical direction of the cylindrical wall portion 81.

  A connector 94 that is integrally formed with the resolver stator 93 is inserted into the connector insertion hole 84 from the inside of the end wall 17 </ b> B into the connector insertion hole 84. Exposed in the axial direction. As shown in FIG. 8, the connector 94 and the connector insertion hole 84 are sealed by an O-ring 75 to prevent entry of foreign matters such as water from the outside. In FIG. 8, the stator 14B of the second electric motor main body 2B is omitted.

  Returning to FIG. 6, an oil passage 76 through which oil used for cooling or lubrication of the second electric motor body 2 </ b> B flows is formed substantially horizontally on the right end surface 80 </ b> B of the end wall 17 </ b> B so as to extend in the front-rear direction. Yes. The oil flow path 76 is arranged at the upper part of the right end surface 80B so as to discharge oil to the upper part of the stator 14B arranged inside the case 11, and the connector insertion hole 84 avoids the oil flow path 76 and oil. It is formed at a position lower than the flow path 76 in the vertical direction.

  The right end face 80B is further provided with a pressure detection oil passage 77 extending in the vertical direction so as to be orthogonal to the oil flow passage 76. The connector insertion hole 84 is opposite to the pressure detection oil passage 77, that is, for pressure detection. The oil passage 77 is provided in front of the vertical plane y passing through the rotation axis x, while the connector insertion hole 84 is provided in the rear of the vertical plane y. In FIG. 5, reference numeral 78 denotes a sealing bolt for sealing the pressure detecting oil passage 77 when not in use.

  A resolver stator 93 in which a connector 94 is integrally formed has a resolver stator main body 95 having a substantially annular shape, and a mounting portion 96 extending from the resolver stator main body 95 to the outer diameter side. The mounting portion 96 is a connector. The resolver stator body 95 is provided at three locations in the circumferential direction so as to avoid an imaginary straight line (A-A line in FIG. 7) passing through the center of 94 and the rotation axis x. A bolt hole 98 through which the mounting bolt 91 is inserted is formed in the mounting portion 96, and the resolver stator 93 is fixed inside the end wall 17 </ b> B by the mounting bolt 91 through which the bolt hole 98 is inserted.

  In the state in which the resolver stator 93 is fixed to the end wall 17B, the mounting bolt 91 is connected to the insulator 65 and the shaft around which the coil 63 is wound, which constitutes the stator 14B of the second electric motor main body 2B, as shown in FIG. Overlap in direction. Further, as shown in FIG. 4, the connector 94 is exposed in the axial direction from the connector insertion hole 84 and connected to the cable-side connector 55.

  As shown in FIGS. 5 and 6, a rib 85 that covers the lower surface of the connector 94 extends from the lower side of the connector insertion hole 84 to the right end surface 80 </ b> B of the end wall 17 </ b> B. The rib 85 is formed to straddle the right end surface 80B and the cylindrical wall portion 81. The rib 85 can also prevent water from entering the connector insertion hole 84 and further protect the connector 94 from foreign matters such as stepping stones. Can do. Therefore, it is preferable that the connector 94 is hidden when the rib 85 is viewed from below, that is, the connector 94 is included in the projection area of the rib 85.

  As shown in FIG. 4, resolver cables 56A and 56B having a cable-side connector 55 connected to the connector 94 at one end pass downward from the end walls 17A and 17B through the upper surface of the case 11 at a substantially horizontal center. The main harness 57 is configured by being bent together with other conductive cables.

  As described above, according to the present embodiment, the case 11 has the axle insertion hole 82 through which the axles 10A and 10B mechanically connected to the rotors 15A and 15B of the first and second electric motor bodies 2A and 2B are inserted. And a connector insertion hole 84 through which the connector 94 electrically connected to the resolver stator 93 is inserted. The axle insertion hole 82 and the connector insertion hole 84 are formed on the left and right end faces 80A and 80B facing the horizontal direction of the case 11. In addition to being formed, the connector insertion hole 84 is formed at a higher position in the vertical direction than the axle insertion hole 82, so that it is possible to suppress water from entering the both insertion holes (the axle insertion hole 82 and the connector insertion hole 84). In addition, since the connector insertion hole 84 of the axle insertion hole 82 and the connector insertion hole 84 that is desired to prevent water from entering is formed at a higher position, the resolver stator 93 of the resolvers 20A and 20B can be more reliably protected. it can.

  In addition, the case 11 is formed so as to extend from below the connector insertion hole 84 of the case 11 and has a rib 85 that covers the lower surface of the connector 94. Therefore, the rib 85 further supplies water to the connector insertion hole 84 from below. And the connector 94 can be protected from foreign matters such as stepping stones.

  The case 11 is formed so as to extend in a cylindrical shape from the periphery of the axle insertion hole 82 of the case 11, and has a cylindrical wall portion 81 that surrounds the outer periphery of the axles 10 </ b> A and 10 </ b> B. Therefore, the rigidity and strength of the rib 85 are improved.

  In addition, since at least a part of the connector insertion hole 84 is formed at a position lower than the vertical uppermost portion of the cylindrical wall portion 81, the connector 94 is connected to the left and right end faces 80 </ b> A and 80 </ b> B, the rib 85, and the cylindrical wall portion 81. Since it is surrounded by three elements, the connector 94 can be further protected from foreign matters such as water.

  The right and left end faces 80A and 80B of the case 11 are formed with an oil passage 76 through which oil used for cooling or lubrication of the first and second electric motor bodies 2A and 2B flows, and the connector insertion hole 84 has an oil passage. Since it is formed at a lower position in the vertical direction than 76, the oil flow path 76 can be formed at a higher position, and the first and second electric motor bodies 2A, 2B can be cooled or lubricated more effectively.

  Further, an attachment bolt 91 for fixing the resolver stator 93 to the end walls 17A, 17B is attached to the stators 14A, 14B of the first and second electric motor bodies 2A, 2B, and the insulator 65 around which the coil 63 is wound and the axial direction Therefore, the axial length of the rear wheel drive device 1 can be shortened.

  Further, since the rear wheel drive device 1 is disposed below the floor panel of the vehicle 3, the passenger living space / loading space on the floor is increased, and the first and second motor main bodies 2A, 2B and the rear wheel Wr are expanded. It is possible to reduce the distance between

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, in the above 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.
Moreover, in the said embodiment, two 1st and 2nd electric motor main bodies 2A and 2B, 1st and 2nd planetary gear type reduction gears 12A and 12B, these 1st and 2nd electric motor main bodies 2A, 2B and 1st The rear wheel drive device 1 having the case 11 for housing the second planetary gear type speed reducers 12A and 12B and the two resolvers 20A and 20B is illustrated as an example. It is only necessary to have one housing for housing the main body and one rotational state amount detection device.
The connector insertion hole 84 is formed on the front side of the vehicle 3 so as to be adjacent to the cylindrical wall portion 81 as long as the connector insertion hole 84 is formed at a position higher in the vertical direction than the axle insertion holes 82 of the left and right end faces 80A, 80B. May be.
In addition, the rib 85 is not limited to being formed integrally with the end walls 17A and 17B, and another member may be attached to the end walls 17A and 17B to cover the lower surface of the connector 94.

1 Rear wheel drive system (electric motor)
2A 1st motor body (motor body)
2B 2nd electric motor body (motor body)
3 Vehicle 10A, 10B Axle (output shaft)
14A, 14B Stator (stator)
15A, 15B Rotor (rotor)
16A, 16B Cylindrical shaft (rotating body)
20A, 20B resolver (rotation state quantity detector)
76 Oil channel (liquid medium channel)
80A, 80B Left and right end surfaces (surfaces facing in the horizontal direction)
81 Cylinder wall part 82 Axle insertion hole 84 Connector insertion hole (connection conductor insertion hole)
85 rib (extension part)
90 Resolver rotor (detector)
93 Resolver stator (detector)
94 Connector (connection conductor)
x Rotation axis y Vertical plane

In order to achieve the above object, the invention described in claim 1
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) disposed so as to be relatively rotatable with respect to the stator. An electric motor main body (for example, first and second electric motor main bodies 2A and 2B in the embodiments described later);
A housing (for example, a case 11 in an embodiment described later) for housing the electric motor main body;
An object to be detected (for example, a resolver rotor 90 in an embodiment described later) installed on the rotor or a rotating body that rotates in conjunction with the rotor (for example, cylindrical shafts 16A, 16B in an embodiment described later); A rotation state amount detection device (for example, a resolver 20A according to an embodiment described later) having a detector (for example, a resolver stator 93 according to an embodiment described later) disposed in the housing and detecting a rotation state of the detection target. 20B), and an electric motor (for example, a rear wheel drive device 1 according to an embodiment described later),
The housing has an output shaft insertion hole (for example, an axle insertion hole 82 of an embodiment described later) through which an output shaft (for example, axles 10A, 10B of the embodiment described later) is mechanically connected to the rotor. And a connection conductor insertion hole (for example, a connector insertion hole 84 in an embodiment described later) through which a connection conductor (for example, a connector 94 in an embodiment described later) electrically connected to the detector is inserted. ,
The output shaft insertion hole and the connection conductor insertion hole are formed on a surface facing the horizontal direction of the casing (for example, left and right end surfaces 80A and 80B in the embodiments described later), and the connection conductor insertion hole is formed on the output shaft. It is formed at a higher position in the vertical direction than the insertion hole ,
The housing is formed so as to extend from below the connection conductor insertion hole, and an extension portion (for example, a rib 85 in an embodiment described later) covering the lower surface of the connection conductor, and the output shaft insertion hole A cylindrical wall portion (for example, a cylindrical wall portion 81 in an embodiment described later) that is formed so as to extend in a cylindrical shape from the periphery and surrounds the outer periphery of the output shaft;
The extending portion is formed across the surface of the casing facing the horizontal direction and the cylindrical wall portion .

The invention according to claim 2, in addition to the configuration according to claim 1,
At least a part of the connection conductor insertion hole is formed at a position lower than a vertical uppermost portion of the cylindrical wall portion.

In addition to the configuration described in claim 1 or 2 , the invention described in claim 3
A liquid medium flow path (for example, an embodiment described later) flows on a surface facing the horizontal direction of the casing through which a liquid medium (for example, an oil according to an embodiment described later) flows for cooling or lubrication of the electric motor body. An oil flow path 76) is formed,
The connection conductor insertion hole is formed at a position lower in the vertical direction than the liquid medium flow path.

Moreover, in addition to the structure of any one of Claims 1-3 , invention of Claim 4 is provided,
The electric motor is mounted on a vehicle (for example, a vehicle 3 in an embodiment described later),
The connection conductor insertion hole is formed on a rear side in the front-rear direction of the vehicle with respect to a vertical plane passing through the rotation axis of the output shaft (for example, a vertical plane y in an embodiment described later).

Moreover, in addition to the structure of any one of Claims 1-4 , invention of Claim 5 is provided,
The electric motor is mounted on a vehicle (for example, a vehicle 3 in an embodiment described later),
The electric motor is disposed below a floor panel of the vehicle.

According to the first aspect of the present invention, since the two insertion holes of the output shaft insertion hole and the connection conductor insertion hole are formed on the surface facing the horizontal direction, the intrusion of water into both the insertion holes can be suppressed. Moreover, since the connection conductor insertion hole in which two water penetration holes are desired to be prevented is formed at a position higher than the output shaft insertion hole, the detector of the rotation state quantity detection device can be more reliably protected.
Further, the extension portion can further suppress the intrusion of water into the connection conductor insertion hole from below, and can further protect the connection conductor from foreign matters such as stepping stones.
Furthermore, since the extension portion is formed across the surface of the casing facing the horizontal direction and the cylindrical wall portion, the rigidity and strength of the extension portion are improved.

According to the second aspect of the present invention, the connection conductor is surrounded by the three elements of the horizontal surface, the extension portion, and the cylindrical wall portion, so that the connection conductor can be further protected from foreign matters such as water.

According to the third aspect of the present invention, the liquid medium flow path can be formed at a higher position, and the electric motor main body can be cooled or lubricated more effectively.

According to the fourth aspect of the present invention, it is possible to suppress the intrusion of water from the front while traveling.

According to the fifth aspect of the present invention, it is possible to expand the passenger living space / loading space on the floor and reduce the distance between the electric motor and the wheel.

Claims (7)

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;
Rotation state amount detection comprising: a detector installed on the rotor or a rotating body that rotates in conjunction with the rotor; and a detector that is disposed in the housing and detects a rotation state of the detector. An electric motor comprising a device,
The housing includes an output shaft insertion hole through which an output shaft mechanically connected to the rotor is inserted, and a connection conductor insertion hole through which a connection conductor electrically connected to the detector is inserted. ,
The output shaft insertion hole and the connection conductor insertion hole are formed on a surface facing the horizontal direction of the housing, and the connection conductor insertion hole is formed at a position higher in the vertical direction than the output shaft insertion hole. An electric motor characterized by   2. The electric motor according to claim 1, wherein the casing includes an extending portion that is formed so as to extend from below the connection conductor insertion hole and covers a lower surface of the connection conductor. The casing is formed so as to extend in a cylindrical shape from the periphery of the output shaft insertion hole, and has a cylindrical wall portion surrounding an outer periphery of the output shaft,
The electric motor according to claim 2, wherein the extending portion is formed across a surface of the housing that faces the horizontal direction and the cylindrical wall portion.   4. The electric motor according to claim 3, wherein at least a part of the connection conductor insertion hole is formed at a position lower than a vertical uppermost portion of the cylindrical wall portion. A liquid medium flow path through which a liquid medium used for cooling or lubrication of the electric motor body is formed on the surface of the housing facing the horizontal direction,
5. The electric motor according to claim 1, wherein the connection conductor insertion hole is formed at a position lower in the vertical direction than the liquid medium flow path. The electric motor is mounted on a vehicle;
The said connection conductor penetration hole is formed in the back side in the front-back direction of the said vehicle rather than the vertical plane which passes along the rotating shaft center of the said output shaft, The any one of Claims 1-5 characterized by the above-mentioned. Electric motor. The electric motor is mounted on a vehicle;
The said electric motor is arrange | positioned below the floor panel of the said vehicle, The electric motor of any one of Claims 1-6 characterized by the above-mentioned.

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