JP2022026538A - Mechatronic drive device - Google Patents

Abstract

To improve an output in a mechatronic drive device by reducing a temperature in a casing at driving.SOLUTION: In a motor generator 12 structuring a mechatronic drive device 10, a resolver rotor 36 in an angle detector 24 is coupled to an axial direction other end 22a of a rotational axis 22, and a resolver 114 is mounted onto an end wall 98 on an axial direction other end side in a casing 20. On this end wall 98, a terminal cover 128 coating the axial direction other end 22a of the resolver 114, the resolver rotor 36, and the rotational axis 22, and defining a third housing chamber 130 in an inner part is provided. Then, in the axial direction other end of the resolver rotor 36 facing to the terminal cover 128 and arranged in the third housing chamber 130, an agitation fan 48 capable of agitating an air in the third housing chamber 130 is provided, and in an inner part of the third housing chamber 130, a heat sink 118 is provided to a neighbor of an upper wall part 112 closing to a first cooling jacket 74.SELECTED DRAWING: Figure 4

Description

The present invention relates to an electromechanical integrated drive device including an electric motor that is rotationally driven under an energizing action and a drive control unit that is housed inside a storage box and drives and controls the electric motor.

The present applicant proposes an electromechanical integrated drive device mounted on an electric vehicle in which a power drive unit and a voltage converter for driving and controlling an electric motor are modularized and housed inside a storage box (see Patent Document 1). ..

This electromechanical integrated drive device includes a motor generator, which is an electric motor that outputs driving force, and a transmission that transmits power from the motor generator, and by supplying power to the motor generator. , The rotating shaft rotates together with the rotor, and the driving force is output from the rotating shaft to the output shaft via the reduction gear mechanism of the transmission. As a result, the driving force from the output shaft is transmitted to the drive wheels of the vehicle via the drive shaft.

Japanese Patent Application No. 2019-171240

In the motor generator in the mechanical / electrical integrated drive device as described above, when heat is generated inside during driving, the cooling liquid flows through the water jacket provided along the outer wall portion of the casing to cool the vicinity of the outer wall portion. On the other hand, heat tends to accumulate in the vicinity of the center of the casing in which the rotating shaft and the rotor are arranged, and this heat causes a decrease in output. Therefore, there is a demand for lowering the internal temperature of the motor generator.

The present invention has been made in connection with the above proposal, and an object of the present invention is to provide a mechanical / electrical integrated drive device capable of lowering the temperature inside the casing during driving to improve the output. ..

In order to achieve the above object, an embodiment of the present invention comprises a casing, an electric motor having a stator and a rotor housed inside the casing, and a rotational state of a rotating shaft of an electric motor to which the rotor is connected. It is modularized by having a rotation detector for detection, a drive control unit that controls the drive of the electric motor, and a first cooling means for cooling the drive control unit in a storage box. The storage box is integrally connected to the first box portion, which is arranged at the upper part of the casing and has a first storage chamber inside and is open upward, and the end wall of the casing, which is on the axial end side of the rotating shaft. A box body having a second box portion protruding in the direction and extending in the vertical direction, a first lid member closing the open end portion of the first box portion, and an open end portion of the second box portion. In a mechanical / electrical integrated drive device equipped with a cover member that is mounted and closed and forms an internal space for accommodating a rotation detector.
The first cooling means is mounted on the bottom wall of the first box portion on the casing side, and on the upper side in the vertical direction in the internal space, a heat sink portion where cold heat is transferred from the first cooling means to a position adjacent to the bottom wall. To prepare for.

According to the present invention, in the electric motor constituting the mechanical / electric integrated drive device, a drive control unit that controls the drive of the electric motor in the first accommodation chamber formed inside the accommodation box provided in the upper part of the casing. And a first cooling means for cooling the drive control unit are housed, and this storage box is arranged in the upper part of the casing and opened upward, and the axial end side of the rotating shaft. A box body having a second box portion that is integrally connected to the end wall of the casing and protrudes in the axial direction and extends in the vertical direction, and a first box that closes the open end portion of the first box portion. It includes a lid member and a cover member that is attached to the open end of the second box portion to close the lid member and has an internal space for accommodating the rotation detector. Then, the first cooling means is placed on the bottom wall of the first box portion on the casing side, and the cold heat from the first cooling means is transferred to a position adjacent to the bottom wall on the upper side in the vertical direction in the internal space. A heat sink is provided.

Therefore, the rotating shaft rotates together with the rotor under the driving action of the electric motor, and the heat generated in the casing is dissipated to the internal space via the rotating shaft and the rotation detector provided on the rotating shaft. However, the warmed and expanded air rises in the internal space and comes into contact with the heat sink portion provided on the upper side in the vertical direction, so that the air is suitably cooled by the cold heat transferred from the first cooling means to the heat sink portion. Will be done.

As a result, by providing a heat sink portion adjacent to the first cooling means on the vertical upper side of the internal space on the axial end side of the rotating shaft, the heat generated inside the casing when the electric motor is driven is generated. When the heat is dissipated to the internal space, the internal temperature of the casing can be lowered through the rotating shaft by cooling the warmed air in the internal space with the heat sink, and the output of the electric motor can be improved accordingly. Is possible.

According to the present invention, the following effects can be obtained.

That is, in the internal space formed between the second box portion constituting the accommodation box and the cover member, a heat sink portion is provided on the upper side in the vertical direction thereof so as to be adjacent to the first cooling means, thereby driving the electric motor. Even when the heat generated inside the casing is sometimes dissipated to the internal space via the rotating shaft, the warmed air in the internal space rises and touches the heat sink to cool it appropriately. Can be done. As a result, by cooling the air in the internal space, it becomes possible to lower the internal temperature of the casing when the electric motor is driven through the rotation shaft, and accordingly, the output of the electric motor can be improved.

It is a partially disassembled perspective view of the electromechanical integrated drive device using the electric motor according to the embodiment of the present invention. It is an overall front view which shows the state which the terminal cover was removed from the drive device on the mechatronics integrated side of FIG. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. It is an enlarged front view of the vicinity of the protrusion in the motor generator of FIG. It is an enlarged perspective view which shows the vicinity of the protrusion wall part of the casing shown in FIG. FIG. 6A is an enlarged front view showing the vicinity of the angle detector according to the first modification, and FIG. 6B is an enlarged front view showing the vicinity of the angle detector according to the second modification.

A preferred embodiment of the mechanical / electrical integrated drive device according to the present invention will be described in detail below with reference to the accompanying drawings.

The electromechanical integrated drive device 10 is used, for example, mounted on an electric vehicle, and as shown in FIGS. 1 and 2, a motor generator (electric motor) that functions as a drive source for outputting a driving force. 12 and a transmission 14 to which power from the motor generator 12 is transmitted, and the motor generator 12 and the transmission 14 are in the width direction (arrows A1 and A2 directions) in the figure of the mechanical / electrical integrated drive device 10. They are integrally provided so as to be adjacent to each other.

The motor generator 12 is, for example, a three-phase AC brushless motor, and as shown in FIGS. 1 to 3, a cylindrical stator 16, a rotor 18 inserted through the center of the stator 16, and an axial direction. It includes a casing 20 which is formed in a substantially cylindrical shape along (directions of arrows B1 and B2) and in which the stator 16 and the rotor 18 are housed. A rotation shaft 22 is connected to the center of the rotor 18, and a variable reluctance type angle detector (rotation detector) 24 is provided at the end of the rotation shaft 22, for example.

As shown in FIG. 3, the stator 16 has, for example, a plurality of steel plates 38 laminated in the axial direction (arrows B1 and B2 directions) and a divided core (not shown) divided in the circumferential direction. In a state where a plurality of divided cores are connected to each other in the circumferential direction, the casing 20 is integrally held by assembling the casing 20 on the outer peripheral side thereof.

The rotor 18 is composed of, for example, a rotor body 26 formed in a circular cross section and a rotating shaft 22 press-fitted into the central portion of the rotor body 26, and a plurality of magnets 30 are inside the rotor body 26. It is installed.

As shown in FIGS. 1 to 5, the rotary shaft 22 is formed in a long length along the axial direction (arrows B1 and B2 directions), and one end side in the axial direction (arrow B1 direction) is closed and the axial direction and the like. It is formed in a bottomed cylindrical shape having an axial space 32 opened toward the end 22a (axial end) side (direction of arrow B2). Then, one end of the rotary shaft 22 is connected to a reduction gear mechanism (not shown) of the transmission 14 described later, and one end in the axial direction and the other end 22a in the axial direction are via a pair of bearings 34a and 34b, respectively. It is rotatably supported inside the casing 20 (see FIG. 3).

Further, the other end 22a in the axial direction of the rotating shaft 22 is arranged so as to be exposed to the outside of the casing 20, and the other end 22a in the axial direction is provided with a resolver rotor (rotor) 36 constituting the angle detector 24.

The resolver rotor 36 is configured by, for example, laminating a plurality of steel plates 38 made of a magnetic material and formed in a substantially annular shape in the axial direction (arrows B1 and B2 directions) of the rotary shaft 22 and having an opening in the center thereof. It is press-fitted and fixed to the other end 22a in the axial direction of the rotating shaft 22 through the formed hole 40.

Further, on the outer peripheral side of the resolver rotor 36, as shown in FIG. 4, between a plurality of large diameter portions 44 bulging outward in the radial direction in a circular arc shape and two adjacent large diameter portions 44. A plurality of small diameter portions 46 are formed so as to be formed in an arc shape in a cross section toward the inside in the radial direction. The large-diameter portion 44 and the small-diameter portion 46 are provided at four locations at equal intervals along the circumferential direction, and the adjacent large-diameter portion 44 and the small-diameter portion 46 have a gentle curve. It is connected by.

In other words, the outer peripheral shape of the resolver rotor 36 is formed in a non-circular shape in which the gap permeance between the resolver (stator) 114 provided on the outer peripheral side thereof can be changed in a sine wave shape with respect to the rotation angle. ing.

Further, as shown in FIGS. 2 to 5, the resolver rotor 36 has one or more steel plates 38 laminated in the axial direction, which are arranged on the other end side in the axial direction (arrow B2 direction). A plurality of stirring fans (stirring members) 48 erected in the axial direction (arrow B2 direction) are provided on several steel plates 38.

For example, the stirring fan 48 cuts a part of the steel plate 38 into a U-shaped cross section when viewed from the axial direction of the resolver rotor 36 shown in FIG. 4, and follows the axial direction of the rotating shaft 22 (direction of arrow B2). It is formed by bending at a substantially right angle. That is, the stirring fan 48 is formed by cutting up a part of the large diameter portion 44 of the steel plate 38.

As a result, the plurality of stirring fans 48 extend radially with respect to the center of the resolver rotor 36, and are axially oriented by a predetermined length with respect to the other end in the axial direction of the resolver rotor 36 (arrows in FIG. 3). It is formed so as to project in the B2 direction). Further, the plurality of stirring fans 48 have the same shape, and are formed in rotational symmetry so as to be equidistant from each other in the circumferential direction of the resolver rotor 36.

As shown in FIGS. 1 and 2, the casing 20 in which the stator 16 and the rotor 18 are housed is formed from, for example, an aluminum alloy or the like by die casting, and the upper portion thereof is formed in the vertical direction (vertical direction in each figure). Is provided with a storage box 50 that is open upward (direction of arrow C1) and sideways (direction of arrow A1).

The storage box 50 includes a box body 52 connected to the casing 20, an upper lid member (first lid member) 54 and a side lid member (second) attached to the upper portion and the side portion of the box body 52, respectively. It is composed of a lid member) 56. The box body 52 is opened toward the box body main portion (first box portion) 58 arranged above the casing 20 (arrow C1 direction) and laterally (arrow A1 direction), and the box body main portion is opened. It is provided with a box body side portion (third box portion) 60 that is integrally connected to the side wall of 58 and hangs down to the side of the casing 20.

Further, the upper open end portion (open end portion) of the box body main portion 58 is closed by attaching a plate-shaped upper lid member 54, and a first storage chamber 62 is formed inside the plate-shaped upper lid member 54. In the first accommodation chamber 62, a power module (not shown) having a group of semiconductor elements responsible for power conversion, an ECU 64 for controlling the power module, a vehicle battery (not shown), and the power module are provided. A capacitor module 66 that smoothes DC power between the modules and a power drive unit (drive control unit) 68 that drives and controls the motor generator 12 by power conversion of the power module are accommodated.

On the other hand, the side open end portion (open end portion) of the box body side portion 60 is closed by attaching the side lid member 56, and the second storage chamber 70 is formed inside the side lid member 56. Then, the second accommodating chamber 70 accommodates a voltage converter 72 for stepping down the DC power and supplying it to the ECU 64 and the like.

Further, as shown in FIGS. 1, 2 and 4, the bottom portion (bottom wall) of the box body main portion 58, which is the upper portion of the casing 20, has a first cooling jacket (first cooling jacket) through which the coolant can flow. 1 cooling means) 74 is provided, and the first cooling jacket 74 is, for example, flat plate-shaped and arranged substantially horizontally along the width direction (arrows A1 and A2 directions) of the motor generator 12, and has a power not shown above the power. The module, the ECU 64 and the capacitor module 66 are arranged. That is, the first cooling jacket 74 is provided for the purpose of cooling the power module, the ECU 64, and the condenser module 66.

On the other hand, the box body side portion 60 is provided with a metal thin plate-shaped heat-dissipating lid 76 (see FIG. 1) so as to partition a part of the second storage chamber 70 formed therein, and the heat-dissipating lid is provided. A second cooling jacket (second cooling means) 78 is configured from the body 76 and the box body side portion 60. Then, in the second accommodation chamber 70, the heat dissipation lid 76 is provided along the vertical direction (arrows C1 and C2 directions) of the motor generator 12 along the box body side portion 60, and the voltage converter 72 is used for heat dissipation. By being fixed in contact with the lid 76, the voltage converter 72 is cooled by the second cooling jacket 78 through which the coolant flows.

That is, the above-mentioned first and second cooling jackets 74 and 78 form a part of the liquid cooling system for cooling the motor generator 12, the power drive unit 68 and the voltage converter 72.

Further, in the box body main portion 58, a cooling liquid introduction pipe for supplying a cooling liquid (not shown) to the second cooling jacket 78 is provided on the wall surface on the other end 22a side (arrow B2 direction) of the rotating shaft 22 in the axial direction. 80 is provided, and the bottom portion of the box body main portion 58 and the box body side portion 60 are provided with a passage 82 for guiding the cooling liquid from the second cooling jacket 78 to the first cooling jacket 74. Further, in the box body main portion 58, a coolant is led out to derive a coolant that has circulated in a motor cooling section (not shown) on a side wall on the side opposite to the box body side portion 60 (in the direction of arrow A2 in FIG. 2). A tube 84 (see FIG. 2) is provided.

Further, as shown in FIG. 1, the box body main portion 58 has a first storage chamber 62 and a first storage chamber 62 on a side wall which is on the transmission 14 side (direction of arrow A1) and above the second cooling jacket 78 (direction of arrow C1). The first to third openings 86, 88, 90 that communicate with the two storage chambers 70 are formed. The first to third openings 86, 88, and 90 are opened so as to be separated from each other along the axial direction (arrows B1 and B2 directions) of the rotating shaft 22 of the motor generator 12.

A 12V power supply bus bar 92 connected to a battery (not shown) and connected to the positive power supply terminal (not shown) provided in the casing 20 and the voltage converter 72 is inserted into the first opening 86. A pair of high-voltage bus bars 94 connecting the capacitor module 66 and the voltage converter 72 housed in the first storage chamber 62 are inserted into the second opening 88. Further, a lead wire 96 that supplies 12V electric power from the voltage converter 72 to the ECU 64 accommodated in the first accommodation chamber 62 is inserted through the third opening 90.

Further, as shown in FIGS. 1 to 5, the casing 20 has an end wall 98 on the other end 22a side in the axial direction of the rotation shaft 22 (direction of arrow B2), and the end wall 98 is the rotation. It is formed in a plane shape standing upright in the vertical direction (arrows C1 and C2 directions) so as to be orthogonal to the axial direction of the shaft 22. A shaft hole 100 through which the other end 22a in the axial direction of the rotating shaft 22 is inserted is opened in the substantially central portion of the end wall 98, and the radial outside of the shaft hole 100 is relative to the end wall 98. A recess 102 recessed toward one end side in the axial direction (direction of arrow B1) of the rotating shaft 22 is formed. The recess 102 is formed in a circular cross-section that is coaxial with the shaft hole 100 in diameter.

The end wall 98 is erected at a predetermined height in the axial direction (arrow B2 direction) with respect to the end wall 98, and surrounds the shaft hole 100 and widens toward the box body 52 side (arrow C1 direction). However, it has a protruding wall portion (second box portion) 104 that constitutes a part of the storage box 50.

As shown in FIGS. 2, 4 and 5, the protrusion 104 is an arc-shaped portion formed on the radial outer side of the recess 102 and covering a part of the lower portion (arrow C2 direction) and the side of the recess 102. 106, a first side wall portion 108 extending diagonally upward from one end of the arc-shaped portion 106 on the transmission 14 side (arrow A1 direction), and a side opposite to the transmission 14 side (arrow A2 direction). A second side wall portion 110 extending diagonally upward from the other end of the arc-shaped portion 106 so as to be separated from the first side wall portion 108, an upper end of the first side wall portion 108, and the first side wall portion 108. 2 It is composed of an upper wall portion 112 that connects the upper end of the side wall portion 110. That is, the protruding wall portion 104 has a cross section that gradually expands in the width direction (arrows A1 and A2 directions) upward (arrow C1 direction) when viewed from the axial direction of the rotation shaft 22 shown in FIGS. 2 and 4. It is formed in a substantially triangular shape.

Further, inside the protruding wall portion 104, a resolver 114 constituting an angle detector 24 for detecting the rotational state of the rotating shaft 22 is mounted in the recess 102 and above the recess 102 (in the direction of arrow C1). A terminal block 116 is provided along the upper wall portion 112, and a heat sink (heat sink portion) 118 is provided on the end wall 98 facing the terminal block 116. Then, the resolver 114 is formed in an annular shape and is fixed so as to cover the outer peripheral side of the resolver rotor 36.

As shown in FIGS. 2, 4 and 5, for example, the heat sink 118 is arranged so as to extend in the width direction (arrows A1 and A2 directions) on the end wall 98, and the heat sink 118 is arranged with respect to the end wall 98. The rotary shaft 22 is formed so as to slightly project toward the other end 22a side in the axial direction (direction of arrow B2) (see FIG. 5). Further, for example, two heat sinks 118 are integrally formed at the same time when the casing 20 is die-cast, and are provided at predetermined intervals in the vertical direction (arrows C1 and C2 directions), and the main body of the box in the storage box 50. It is arranged so as to be close to the first cooling jacket 74 arranged at the bottom of the portion 58. Then, the heat sink 118 is suitably cooled by transferring the cold heat of the first cooling jacket 74 through the bottom portion of the box body main portion 58 and the end wall 98.

The heat sink 118 is not limited to the case where it is formed in a plate shape that bulges with respect to the end wall 98 of the casing 20, for example, a satin-like shape, a recessed shape, or a knurled shape with respect to the surface of the end wall 98. It may be formed in an uneven shape such as a shape (mesh shape). That is, the shape and quantity of the heat sink 118 are not particularly limited as long as the surface area of the end wall 98 on the terminal cover (cover member) 128 side, which will be described later, can be increased. Further, the heat sink 118 may be provided separately from the metal material having high thermal conductivity, instead of being integrally formed with the casing 20.

As shown in FIGS. 2, 4 and 5, the terminal block 116 is provided along the width direction (arrows A1 and A2 directions), and the three-phase busbars (three-phase busbars) are equidistantly spaced in the width direction. Busbars) 120a, 120b, 120c and three-phase power lines (busbars) 122a, 122b, 122c are electrically connected, respectively, and are provided by resin insulating partition walls provided at equal intervals in the width direction. The lead wires 120a, 120b, 120c and the power lines 122a, 122b, 122c are separated from each other (phase insulation).

Then, a fourth opening (opening) 127 communicating with the first storage chamber 62 of the storage box 50 is opened in the protruding wall portion 104, and electricity is supplied to the three-phase power lines 122a, 122b, 122c and the resolver 114. The signal line 126 to be connected is introduced into the first accommodation chamber 62 through the fourth opening 127.

As shown in FIGS. 1 and 3, a terminal cover 128 formed in substantially the same cross-sectional shape as viewed from the axial direction of the rotating shaft 22 is attached to the above-mentioned protruding wall portion 104 with respect to the other end side in the axial direction. It is fixed with a fastening bolt (not shown). As a result, a third accommodation chamber (internal space) 130 surrounded by the terminal cover 128, the protruding wall portion 104, and the end wall 98 is formed. Then, the third accommodation chamber 130 communicates with the axial space 32 of the rotating shaft 22 having the other end 22a in the axial direction, and is said to be on the other end 22a in the axial direction of the rotating shaft 22 and the other end 22a in the axial direction. It houses a resolver 114 and a terminal block 116 arranged so that the stirring fan 48 is exposed. That is, the terminal cover 128 covers the resolver 114, the terminal block 116, and the other end 22a of the rotating shaft 22 in the axial direction in a liquid-tight manner.

As shown in FIGS. 1 and 2, the transmission 14 includes a transmission case 132 and a reduction gear mechanism (not shown) housed inside the transmission case 132. This reduction gear mechanism includes a pair of output shafts 134 arranged in parallel with the rotation shaft 22 of the motor generator 12, and is connected so as to be interlocked with one end in the axial direction of the rotation shaft 22.

The mission case 132 has an inner case half body 136 connected to the casing 20 of the motor generator 12 on one end side of the output shaft 134 and the inner case half body on one end side in the axial direction (arrow B1 direction) of the output shaft 134. It comprises an outer case half body 138 that covers the open end of 136. The inner case half body 136 has a protruding portion 140 arranged close to the side of the casing 20, and the protruding portion 140 has a pair of left and right driving wheels of a vehicle in which the driving force of the motor generator 12 is not shown. A differential gear mechanism (differential gear) (not shown) is accommodated so as to be connected to the pair of output shafts 134 in order to distribute the respective gears.

Further, one output shaft 134 is rotatably supported by the mission case 132 with a part facing the protruding end of the protruding portion 140 in the inner case half body 136, and the other output shaft 134 is the one. It is coaxial with the output shaft 134 and is rotatably supported by the mission case 132 while partially facing the outside from the outer case half body 138. A drive shaft (not shown) for transmitting power to the drive wheel side suspended on the vehicle so as to be able to swing up and down is connected to the output shaft 134 via a suspension device (not shown).

The mechanical / electrical integrated drive device 10 according to the embodiment of the present invention is basically configured as described above, and the operation and the effect thereof will be described next.

First, based on the control signal from the ECU 64 in the motor generator 12, power is supplied to the three-phase power lines 122a, 122b, 122c from a power source (not shown) to form a conductor (shown). Is energized and excited accordingly to generate a rotating magnetic field, and the rotor 18 to which the magnet 30 serving as a magnetic pole is mounted is rotationally driven. Then, the rotary shaft 22 rotates together with the rotor 18 in a state of being supported by the bearings 34a and 34b in the casing 20, so that the rotary shaft 22 is output as a rotational driving force.

Further, when the resolver rotor 36 of the angle detector 24 rotates together with the rotating shaft 22, the rotation angle (rotational force) of the resolver rotor 36, that is, the rotation angle of the rotating shaft 22 becomes an electric signal due to the gap change with respect to the resolver 114. It is output to the ECU 64 through the signal line 126. As a result, the rotation angle (rotation amount) of the rotation shaft 22 and the rotor 18 in the motor generator 12 is detected.

During the rotation of the rotor 18 and the rotating shaft 22 described above, the rotor body 26 and the magnet 30 generate heat inside the casing 20 as the rotor 18 rotates, and a water jacket provided in the vicinity of the outer wall portion of the casing 20. Since heat tends to be trapped in the vicinity of the central portion away from (not shown), the rotating shaft 22 is heated by the heat generated inside. Then, the air in the shaft space 32 is warmed by the heating of the rotating shaft 22, and the air is discharged to the third storage chamber 130 through the open axial end end 22a. This air expands as it is warmed, and convects upward (in the direction of arrow C1 and upward in the vertical direction) in the third accommodation chamber 130 and collects in the vicinity of the upper wall portion 112 that widens in the width direction.

As a result, the warmed air touches the heat sink 118 adjacent to the upper wall portion 112, so that heat is exchanged with the heat sink 118 to which the cold heat of the coolant flowing through the first cooling jacket 74 is transmitted, and the air is exchanged. Is appropriately cooled, and the coolant of the first cooling jacket 74 to which the heat of the air is transferred is led out from the coolant outlet pipe 84 to the outside.

Further, in the third storage chamber 130, as the rotating shaft 22 and the resolver rotor 36 rotate, the four stirring fans 48 rotate clockwise with the rotating shaft 22 as the center of rotation, for example, clockwise (arrow D in FIG. 4). By rotating in the direction), the air in the third storage chamber 130 is agitated, so that the air in the third storage chamber 130 is forcibly convected.

Specifically, when the rotating shaft 22 and the resolver rotor 36 rotate clockwise (in the direction of arrow D) when viewed from the axial direction of the rotating shaft 22 shown in FIGS. 2 and 4, the stirring fan is used. The air near the rotation shaft 22 is sent by the 48 to the first side wall portion 108 side so as to swirl along the arc-shaped portion 106 which is the lower end of the third accommodation chamber 130, and is sent along the first side wall portion 108. It goes up (in the direction of the arrow in Fig. 5). Then, in the process of air flowing along the first side wall portion 108, the air is suitably cooled by the cold heat transferred from the second cooling jacket 78 arranged in the vicinity of the first side wall portion 108.

The air rising along the first side wall portion 108 hits the upper wall portion 112 and flows to the side opposite to the transmission 14 side (arrow A2 direction), and accordingly, the bottom and the top from the first cooling jacket 74. It is cooled by the cold heat transferred to the wall portion 112. At the same time, the air flows in contact with the heat sink 118, so that the air is suitably cooled by the cold heat transferred from the first cooling jacket 74 to the heat sink 118.

Then, the air flowing along the upper wall portion 112 is deflected downward by hitting the upper end of the second side wall portion 110 and flows so as to descend along the second side wall portion 110 (arrow in FIG. 5). Direction), it reaches the arc-shaped portion 106 again and is stirred by the stirring fan 48. That is, the air in the third storage chamber 130 circulates clockwise along the inside of the protruding wall portion 104 in a substantially triangular cross section under the stirring action of the stirring fan 48.

In this way, the air in the third storage chamber 130 is stirred and flowed by the stirring fan 48, so that the air is suitably cooled by the cooling heat from the first and second cooling jackets 74 and 78 and the heat sink 118. Along with this, the air in the shaft space 32 of the rotary shaft 22 communicating with the third storage chamber 130 is circulated with the cooled air, so that the air is connected to the rotary shaft 22 through the rotary shaft 22. The resolver rotor 36, the rotor 18 (including the magnet 30) provided inside the casing 20, and the stator 16 arranged on the outer peripheral side of the rotor 18 are cooled.

Finally, the rotational driving force output to the rotary shaft 22 of the motor generator 12 is transmitted to the pair of output shafts 134 via the reduction gear mechanism and the differential gear mechanism (not shown) in the transmission 14, and the drive wheels of the electric vehicle are used. It is transmitted to a drive shaft (not shown) for transmitting power to the side.

As described above, in the present embodiment, in the motor generator 12 constituting the mechanical / electrical integrated drive device 10, the power drive unit 68 and the first cooling jacket 74 are housed in the upper part of the casing 20 of the motor generator 12. The storage box 50 having the above is formed, and the end wall 98 on the other end side in the axial direction (arrow B2 direction) of the casing 20 is provided with a protruding wall portion 104 projecting toward the other end side in the axial direction. By attaching the terminal cover 128 to the protrusion 104, a third casing 130, which is an internal space, is formed inside. In the third storage chamber 130, the other end 22a in the axial direction of the rotating shaft 22 and the angle detector 24 capable of detecting the rotational state of the rotating shaft 22 are housed, and the bottom of the box body main portion 58 in the storage box 50. A heat sink 118 is provided in the vicinity of the upper wall portion 112 of the third storage chamber 130 so as to be adjacent to the mounted first cooling jacket 74.

Then, when the rotor 18 and the rotating shaft 22 rotate under the energizing action on the motor generator 12, and heat is generated inside the casing 20, the heat inside is dissipated into the third accommodation chamber 130 through the rotating shaft 22. At the same time, the air warmed by the heat radiated to the third storage chamber expands and convects upward, gathers in the vicinity of the upper wall portion 112, and is provided adjacent to the first cooling jacket 74. It is suitably cooled by touching the heat sink 118.

As a result, in the third casing 130 facing the other end 22a in the axial direction of the rotating shaft 22, the heat sink 118 is provided above the third casing 130 so as to be adjacent to the first cooling jacket 74, and when the motor generator 12 is driven, the heat sink 118 is provided. Since the heat generated inside the casing 20 can be suitably dissipated and the vicinity of the central portion of the casing 20 can be cooled, the internal temperature of the casing 20 can be lowered to improve the output.

Further, a resolver rotor 36 constituting the angle detector 24 is provided on the other end 22a in the axial direction of the rotating shaft 22, and a plurality of stirring fans 48 are provided on the steel plate 38 on the other end side in the axial direction in the resolver rotor 36. Then, when the motor generator 12 is driven, the air in the third accommodation chamber 130 can be agitated by the stirring fan 48 that rotates together with the rotating shaft 22. Therefore, even when the heat generated inside the casing 20 is dissipated to the third storage chamber 130 via the rotating shaft 22, the warmed air can be forcibly circulated in the third storage chamber 130. Along with that, the air can be cooled more effectively.

Further, by forming the stirring fan 48 integrally with the resolver rotor 36, the number of parts can be reduced as compared with the case where the stirring fan 48 is provided as a separate body, so that the manufacturing cost and the manufacturing time can be suppressed. Will be.

Furthermore, the storage box 50 provided in the upper part of the casing 20 has a box body side portion 60 provided on the side of the box body main portion 58, and the inside of the box body side portion 60 is a second. The second cooling jacket 78 is formed from the heat-dissipating lid 76 and the box body side portion 60, which has a heat-dissipating lid 76 attached so as to partition a part of the two accommodation chambers 70. More preferably due to the cold heat transferred from the second cooling jacket 78 through the casing 20 as the warmed air convection inside the containment chamber 130 moves along the first side wall 108 adjacent to the second cooling jacket 78. To be cooled to.

Further, inside the third accommodation chamber 130, there is a terminal block 116 to which the three-phase lead wires 120a, 120b, 120c and the three-phase power lines 122a, 122b, 122c of the motor generator 12 are electrically connected, respectively. In addition to being provided, the upper wall portion 112 is formed with a fourth opening 127 for communicating the third storage chamber 130 and the first storage chamber 62 of the storage box 50, and the lead wires 120a, 120b, 120c are formed. And the power lines 122a, 122b, 122c are arranged so as to be exposed inside above the third accommodation chamber 130 (in the direction of arrow C1) via the terminal block 116.

As a result, the three-phase lead wires 120a, 120b, 120c and the three-phase power lines 122a, 122b, 122c are in contact with the air above the third storage chamber 130 facing the first cooling jacket 74, respectively. The air is also heat-exchanged by the outlet wires 120a, 120b, 120c and the power lines 122a, 122b, 122c cooled by the first cooling jacket 74 to be suitably cooled.

Further, the stirring fan 48 is not limited to the case where the steel plate 38 constituting the resolver rotor 36 is cut up and formed, and is not limited to the case where it is formed by cutting up the steel plate 38. The outer edge side of the four large diameter portions 44 of the steel plate 38 arranged in the (arrow B2 direction) is bent inward in the radial direction by about 90 ° and erected in the axial direction to create a stirring fan (stirring member). ) 152 may be formed. That is, four stirring fans 152 are formed corresponding to the number of large diameter portions 44, are formed so as to face each other in the radial direction, and are formed so as to face each other with the hole portion 40 interposed therebetween. ..

Then, the resolver rotor 150 having the stirring fan 152 rotates together with the rotating shaft 22, so that the air in the third storage chamber 130 can be stirred and appropriately flowed by the four stirring fans 152. Therefore, the inside of the casing 20 in the motor generator 12 can be cooled by supplying the cooled air into the shaft space 32 of the rotating shaft 22.

In this configuration, the stirring fan 152 can be easily bent by bending a part of the steel plate 38 which is the other end side in the axial direction (terminal cover 128 side) of the steel plates 38 constituting the resolver rotor 150 in the axial direction. Since it can be formed, for example, the number of parts and the manufacturing cost can be reduced as compared with the case where the stirring fan is attached to the resolver rotor 150 as a separate member.

Further, the stirring fans 48 and 152 are not limited to the case where the stirring fans 48 and 152 are formed by bending a part of the steel plate 38 constituting the resolver rotors 36 and 150, and as shown in FIG. 6B, for example. A stirring fan (stirring member) 166 may be provided for the ring member (member) 164 for fixing the resolver rotor 162 at the other end in the axial direction of the rotating shaft 160.

The ring member 164 is exposed in an circumscribed circle that is substantially circumscribed to the resolver rotor 162 that is formed in a non-perfect circle when viewed from the axial direction, and the hole 40 of the resolver rotor 162 is in the center thereof. It is formed in an annular shape of a thin plate provided with a shaft insertion hole 40b that overlaps with, and moreover, a part of it is cut and bent (cut up) at a substantially right angle toward the other end side in the axial direction. A stirring fan 166 is formed in the above. The stirring fan 166 is provided rotationally symmetrically so as to be spaced apart from each other at equal intervals in the circumferential direction.

Further, the stirring fan 166 is provided at a position radially outside the nut member 172 described later, and is formed so as to project by a predetermined height with respect to the other surface in the axial direction of the ring member 164.

On the other hand, at the other end 22a in the axial direction of the rotating shaft 160, an insertion portion 168 inserted into the hole 40 opened in the center of the resolver rotor 162 and an outer periphery formed further toward the tip end side in the axial direction with respect to the insertion portion 168. It is provided with a tip 170 having a screw on the surface.

Then, the resolver rotor 162 is inserted into the insertion portion 168 from the other end 22a side in the axial direction of the rotating shaft 160, and the stirring fan 166 becomes the other end side in the axial direction in a state of being engaged with the insertion portion 168. As described above, the ring member 164 is inserted through the tip portion 170 and brought into contact with the other end side in the axial direction of the resolver rotor 162, and the nut member 172 is screwed into the tip portion 170 to cause the ring member 164. It is screwed until it comes into contact with the other end in the axial direction of. As a result, the resolver rotor 162 is sandwiched and fixed by the ring member 164 in a state of being engaged to one end side in the axial direction with respect to the rotating shaft 22.

In this way, by providing the stirring fan 166 on the ring member 164 that is fastened together to fix the resolver rotor 162 to the other end in the axial direction of the rotating shaft 160, the stirring fan 166 is provided together with the rotating shaft 160. Can be rotated in the third storage chamber 130 to agitate and flow the air. Further, by providing the stirring fan 166 on the ring member 164, the number of parts can be reduced as compared with the case where only the stirring fan 166 is provided as a separate member, so that the manufacturing cost and the manufacturing time can be suppressed. Become.

It should be noted that the mechanical / electrical integrated drive device according to the present invention is not limited to the above-described embodiment, and of course, various configurations can be adopted without departing from the gist of the present invention.

10 ... Mechanical and electrical integrated drive device 12 ... Motor generator 14 ... Transmission 18 ... Rotor 20 ... Casing 22, 160 ... Rotating shaft 24 ... Angle detector 36, 150, 162 ... Resolver rotor 48, 152, 166 ... Stirring fan 50 ... Storage box 62 ... 1st storage room 70 ... 2nd storage room 74 ... 1st cooling jacket 78 ... 2nd cooling jacket 98 ... End wall 114 ... Resolver 116 ... Terminal stand 118 ... Heat sink 128 ... Terminal cover 130 ... 3rd storage room 164 ... Ring member

Claims (6)

It has an electric motor having a casing, a stator and a rotor housed inside the casing, and a rotation detector for detecting the rotational state of the rotating shaft of the electric motor to which the rotor is connected. The drive control unit that controls the drive of the motor and the first cooling means for cooling the drive control unit are modularized by being housed inside the storage box, and the storage box is the casing. The first box portion, which is arranged at the upper part and has a first storage chamber inside and opens upward, is integrally connected to the end wall of the casing, which is on the axial end side of the rotating shaft, and is connected in the axial direction. Attached to a box body having a second box portion that protrudes and extends in the vertical direction, a first lid member that closes the open end portion of the first box portion, and an open end portion of the second box portion. In a mechanical / electrical integrated drive device provided with a cover member that is closed by being closed and that forms an internal space inside for accommodating the rotation detector.
The first cooling means is mounted on the bottom wall of the first box portion on the casing side, and is located on the upper side in the vertical direction in the internal space from the first cooling means at a position adjacent to the bottom wall. A mechanical and electrical integrated drive device equipped with a heat sink that transfers cold heat. In the mechanical / electrical integrated drive device according to claim 1,
An electromechanical integrated drive device having an axial end portion of the rotating shaft arranged so as to face the internal space and provided with a stirring member that rotates together with the rotating shaft to agitate the air in the internal space. In the mechanical / electrical integrated drive device according to claim 2.
The rotation detector includes a rotor mounted on an axial end of the rotation shaft and a stator provided on the outer peripheral side of the rotor and fixed to the casing, and the stirring member is the rotor. A mechanical and electrical integrated drive device that is installed integrally with. In the mechanical / electrical integrated drive device according to any one of claims 1 to 3.
The storage box is integrally connected to the first box portion and the end wall, and is open to the side of the casing substantially orthogonal to the axial direction of the rotation axis, and the opening of the third box portion. It is provided with a second lid member that closes the end and forms a second casing inside.
Inside the second storage chamber, heat can be exchanged between the casing and the cooling lid body mounted so as to partition a part of the second storage chamber and the third box portion. 2 Mechanical and electrical integrated drive device in which cooling means are integrally configured. In the mechanical / electrical integrated drive device according to any one of claims 1 to 4.
The terminal block of the electric motor is provided in the internal space, and an opening for communicating the first accommodation chamber and the internal space is provided in the wall portion vertically above the second box portion. ,
The three-phase bus bar that connects the drive control unit and the electric motor so as to be able to energize three phases is arranged vertically upward in the internal space, and the terminal block is exposed to the internal space. A mechanical and electrical integrated drive device that is connected to. In the mechanical / electrical integrated drive device according to claim 3,
The stirring member is a mechanical / electrical integrated drive device provided on a member that is fastened together with the rotor to the rotating shaft.

Images