JP5208577B2 - Motor unit - Google Patents

Description

  The present invention relates to a motor unit.

Conventionally, a motor unit driven by a motor includes a motor housed in a motor case, and a power device (an inverter, a battery, etc.) for supplying electric power to the motor or charging regenerative electric power from the motor. ) And a motor terminal block for electrical connection. Therefore, the motor case has an opening at a location where the motor terminal block is attached. For this reason, a motor terminal block structure has been proposed for preventing foreign matter from entering the motor case through the opening and preventing motor lubricating oil from leaking from the inside of the motor case (for example, patents). Reference 1).
In the terminal block structure of Patent Document 1, a flange portion is formed on a terminal block that closes an opening formed in a housing, and a seal portion is provided on a contact surface of the flange portion with the outer surface of the housing.
JP 2008-5601 A

By the way, in the conventional structure such as the terminal block structure of Patent Document 1 described above, since the cables and terminals connected to the terminal block are generally formed of a material having good thermal conductivity such as copper, the motor is driven. Therefore, there is a problem that heat generated by the cable is easily transmitted and the insulating coating of the cable is easily deteriorated by heat. On the other hand, if the heat resistance is improved in order to prevent the deterioration of the cable, there is a problem that the housing and the terminal block are enlarged and the cost is increased.
In addition, since the terminal block is generally formed of resin, the sealing performance between the terminal block and the housing tends to deteriorate over time.

  Therefore, the present invention has been made in view of the above circumstances, and provides a motor unit having a motor terminal block that can reduce the influence of heat and can reliably maintain sealing performance. .

In order to solve the above-described problems, the invention described in claim 1 includes a motor case (for example, the motor case 15 in the embodiment) in which a motor (for example, the motor 23 in the embodiment) is accommodated, and the motor case. wall (e.g., the wall portion 77 in the embodiment) motor terminal block attached to (e.g., a motor terminal block 70 in the embodiment) and, in the motor unit having a (e.g., the motor unit 100 in the embodiment), wherein A mounting plate (for example, the mounting plate 50 in the embodiment) is provided between the motor terminal block and the wall portion, and the wall portion is an internal wall standing upright inside the motor case, Is formed with an opening (for example, opening 78 in the embodiment) through which the motor terminal block can be inserted and which can hold the motor terminal block. The motor terminal block is configured to cover the periphery of a conductive member (for example, the conductive member 66 in the embodiment) with a cylindrical insulating member (for example, the motor terminal connection portion 62 and the inverter cable connection portion 63 in the embodiment). The insulating member is formed with a protruding portion (for example, flange portion 64 in the embodiment) protruding outward from the outer peripheral surface of the motor terminal block, and the motor terminal block can be inserted into the mounting plate. A through hole is formed, and the mounting plate is disposed between the projecting portion of the insulating member and the inner wall, and when the motor terminal block is mounted to the motor case, the through hole of the mounting plate The peripheral portion of the inner wall is positioned closer to the conductive member than the peripheral portion of the opening of the inner wall, the mounting plate is made of metal, and at least a contact surface with the wall portion ( Eg to have contact surface 50A) is formed by a flat surface in the embodiment, the flat surface of the mounting plate and the wall portion is characterized by being closely fixed.

  The invention described in claim 2 is characterized in that the wall portion and the flat surface of the mounting plate are closely fixed via a liquid packing.

  The invention described in claim 3 is characterized in that the motor terminal block and the mounting plate are integrated.

  The invention described in claim 4 is configured such that one end of the motor terminal block is capable of binding a plurality of motor terminals of the motor (for example, the motor terminal 73 in the embodiment), and the other end of the motor terminal block is A plurality of inverter cables (for example, the inverter cable 71 in the embodiment) of the inverter (for example, the inverter 61 in the embodiment) are configured to be bundled.

According to a fifth aspect of the present invention, the motor terminal block is mounted so as to pass through an opening formed in the wall (for example, the opening 78 in the embodiment), and the mounting plate is connected to the wall. It is characterized by being formed in a substantially L-shaped cross section along the contact surface with the portion and the opening.

According to the first aspect of the present invention, since the motor terminal block is attached to the wall portion formed in the motor case via the mounting plate, the heat radiation area for radiating the heat generated by driving the motor is widened. Can be secured. Moreover, heat transfer performance can be ensured by forming the mounting plate with a metal having high thermal conductivity and rigidity. Furthermore, by forming the contact surface of the mounting plate with the wall portion as a flat surface, the mounting plate and the wall portion can be reliably brought into close contact with each other. Since the motor case is generally made of metal, the mounting plate and the housing can be firmly fixed using bolts or the like. Therefore, heat generated in the motor case can be efficiently radiated to the outside, so that it is not necessary to consider the influence of heat on components arranged around the motor case, and reliability can be improved. Furthermore, the degree of freedom of layout of each component constituting the motor unit is increased, and the motor unit can be reduced in size and cost.
Moreover, a wide heat transfer surface and heat dissipation surface can be secured by standing the wall portion in the motor case instead of the outer wall of the motor case itself. Therefore, heat can be radiated efficiently.

  According to the invention described in claim 2, since the sealing performance can be secured with the liquid packing without using a seal ring or the like, there is no need to process a groove or the like for installing the seal ring. It is possible to easily and sufficiently seal.

  According to the invention described in claim 3, by integrating the motor terminal block and the mounting plate, it can be easily attached to the motor case, and the working efficiency can be improved. Further, the heat generated by driving the motor can be efficiently transferred from the motor terminal block to the mounting plate. Further, by integrating the motor terminal block and the mounting plate, the sealing property between the motor terminal block and the mounting plate can be ensured.

  According to the invention described in claim 4, since a plurality of motor terminals and inverter cables are bundled, heat can be efficiently radiated and strength can be improved.

According to the fifth aspect of the present invention, the strength of the motor terminal block can be improved, and heat can be efficiently radiated by absorbing heat from the motor terminal block and transferring the heat to the mounting plate.

Next, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic sectional view of a motor unit. As shown in FIG. 1, the motor unit 100 includes a vehicle power train (hereinafter referred to as a power train) 10 and an inverter 61 attached above the power train 10.

  The power train 10 includes a motor housing 11 that houses a motor 23 having a stator portion 21 and a rotor portion 22, and a power transmission portion that is fastened to one side of the motor housing 11 and that transmits power from the output shaft 24 of the motor 23. A transmission housing 12 that houses (not shown) and a sensor housing 13 that is fastened to the other side of the motor housing 11 and houses the rotation sensor 25 of the motor 23. The mission housing 12 includes a common housing 12A fastened to the motor housing 11 and a gear housing 12B fastened to the common housing 12A. The motor housing 11 is configured as a motor chamber 36, the mission housing 12 is configured as a mission chamber 37, and the sensor housing 13 is configured as a sensor chamber 38. Furthermore, the motor housing 11, the mission housing 12 and the sensor housing 13 constitute a motor case 15.

  The motor housing 11 is formed in a substantially cylindrical shape so as to cover the entire motor 23. A bearing 26 that rotatably supports one end of the output shaft 24 of the motor 23 is provided on the mission housing 12 side of the boundary between the motor housing 11 and the mission housing 12, and the boundary between the motor housing 11 and the sensor housing 13. On the sensor housing 13 side, a bearing 27 that rotatably supports the other end of the output shaft 24 of the motor 23 is provided.

  Further, a breather passage 35 communicating with each other is formed in the wall portion 31 of the motor housing 11, the wall portion 32 of the transmission housing 12, and the wall portion 33 of the sensor housing 13.

  Here, in the wall portion 31 of the motor housing 11, a water jacket 55 for cooling the motor 23 is provided on the inner peripheral side of the breather passage 35 so as to cover the entire circumference of the stator portion 21 of the motor 23. Yes. The stator portion 21 is shrink-fitted into the motor housing 11 and is disposed so as to be in close contact with the inner peripheral surface of the motor housing 11.

  A breather chamber 51 for separating the lubricating oil used in the powertrain 10 is formed in the mission housing 12. That is, the lubricating oil scattered by the rotation of the power transmission unit (gear) and the motor 23 can be separated in the breather chamber 51, and the lubricating oil leaks to the outside from the breather pipe 39 provided in the breather chamber 51 and communicating with the outside. This can be prevented.

  The breather chamber 51 is formed at a position corresponding to the uppermost portion of the power train 10. The breather chamber 51 communicates with the breather passage 35 so that high-pressure and high-temperature air in the power train 10 can be discharged from the breather pipe 39. Further, the breather chamber 51 communicates with the motor chamber 36, the mission chamber 37, and the sensor chamber 38 via the breather passage 35.

  The sensor housing 13 is provided with a motor terminal block 70 for electrically connecting the inverter 61 and the motor 23 (motor terminal 73) disposed above the power train 10. The motor terminal block 70 is disposed in a connection chamber 81 formed in the sensor housing 13. Here, an inverter cable 71 is laid between the inverter terminal block (not shown) of the inverter 61 and the motor terminal block 70 of the power train 10, and the motor 23 and the inverter 61 are electrically connected.

  2 to 5 are drawings of the motor terminal block 70. As shown in FIGS. 2 to 5, the motor terminal block 70 is formed of a resin material, and a motor terminal connection portion 62 to which a motor terminal 73 extending from the motor 23 is connected and an inverter cable 71 are connected. And an inverter cable connecting portion 63. Three motor terminal connections 62 and inverter cable connections 63 are formed so as to correspond to the respective phases of the three-phase motor.

  The motor terminal connecting part 62 is formed in a substantially cylindrical shape, and a bolt hole 65 is formed on the upper surface thereof. Using this bolt hole 65, the motor terminal 73 having the LA terminal 53 attached to the tip can be fastened and fixed to the motor terminal connecting portion 62 with a fastening bolt 74 (see FIG. 6). Further, the fastening bolt 74 is electrically connected to a conductive member 66 disposed inside the motor terminal connecting portion 62 and the inverter cable connecting portion 63.

  On the other hand, the inverter cable connecting portion 63 is formed in a substantially cylindrical shape, and a bolt hole 67 is formed on a side surface thereof. Using this bolt hole 67, the inverter cable 71 having the LA terminal 54 attached to the tip can be fastened and fixed to the inverter cable connecting portion 63 with a fastening bolt 79. The fastening bolt 79 is also electrically connected to the conductive member 66 (see FIG. 6).

  Further, a flange portion 64 is formed over the entire circumference at the boundary between the motor terminal connection portion 62 and the inverter cable connection portion 63. Further, a plate-like mounting plate 50 made of a metal having a high heat transfer coefficient such as aluminum is provided on the inverter cable connecting portion 63 side of the flange portion 64. A contact surface 50A of the mounting plate 50 with the sensor housing 13 is formed flat. The conductive member 66 and the mounting plate 50 are not electrically connected. Further, the mounting plate 50 is formed with two screw holes 69 for fastening and fixing to a wall portion 77 (described in detail later).

  FIG. 6 is a detailed view of part A of FIG. FIG. 6 shows a cross section of a portion where the breather passage 35 is not formed. As shown in FIG. 6, the stator portion 21 and the rotor portion 22 constituting the motor 23 are arranged in the motor housing 11. The stator portion 21 includes a stator core 21A in which a plurality of substantially annular plate members are stacked, and a motor winding 21B wound around the stator core 21A. A motor terminal 73 extends from the motor winding 21 </ b> B toward the motor terminal block 70. An LA terminal 53 is provided at the tip of the motor terminal 73 and is fastened to the motor terminal block 70 via fastening bolts 74. In order to fasten the fastening bolt 74 to the motor terminal block 70, an opening 75 is formed in the top surface 13 </ b> A of the sensor housing 13, and a lid member 76 is provided to close the opening 75.

A wall 77 is erected between the top surface 13A and the bottom surface 13B of the sensor housing 13 at a position where the motor terminal block 70 is attached. An opening 78 is formed in the wall 77, and the inverter cable connecting portion 63 of the motor terminal block 70 is inserted into the opening 78. Specifically, three openings 78 through which three inverter cable connection portions 63 corresponding to the respective phases of the three-phase motor can be inserted are formed. That is, when the motor terminal block 70 is attached from the motor housing 11 side of the wall portion 77, the inverter cable connection portion 63 of the motor terminal block 70 protrudes to the connection chamber 81 side of the wall portion 77 and is provided on the motor terminal block 70. The mounting plate 50 and the wall 77 abut against each other.
In this state, a screw (not shown) is inserted through a screw hole 69 formed in the mounting plate 50 to fasten and fix the mounting plate 50 and the wall portion 77. The mounting plate 50 and the wall portion 77 are fastened and fixed in a state where a liquid packing is applied to ensure a sealing property.

  Further, in the connection chamber 81, the inverter cable connection portion 63 of the motor terminal block 70 and the inverter cable 71 are connected. Specifically, an LA terminal 54 is provided at the tip of the inverter cable 71 and is fastened to the motor terminal block 70 via fastening bolts 79. In order to fasten the fastening bolt 79 to the motor terminal block 70, an opening 82 is formed in the side surface 13 </ b> C of the sensor housing 13, and a lid member 83 is provided to close the opening 82.

  The inverter cable 71 passes through an opening 84 formed in the upper portion of the connection chamber 81, is laid in the inverter 61, and is connected to an inverter terminal block (not shown).

(Function)
The operation of the motor unit 100 configured as described above will be described.
When the motor 23 of the power train 10 is driven to rotate, the motor 23 generates heat. The generated heat is transferred to the motor winding 21 </ b> B having a high heat transfer rate, and further transferred to the motor terminal 73. If the motor terminal block 70 has a conventional structure, this heat is transferred in the order of the motor terminal 73 → LA terminal 53 → fastening bolt 74 → conductive member 66 → fastening bolt 79 → LA terminal 54 → inverter cable 71. It is difficult to ensure reliability because the inside of the inverter 61 may become hot and the elements and sensors inside the inverter 61 may deteriorate or break down.

  On the other hand, in the motor terminal block 70 of the present embodiment, when the heat from the motor 23 described above is transferred to the motor terminal block 70, the motor terminal connecting portion 62 also rises in temperature due to the influence of heat. Heat is transferred to the mounting plate 50 having high thermal conductivity, and the heat is transferred to the wall 77 of the sensor housing 13 having high thermal conductivity. Therefore, the mounting plate 50 can absorb most of the heat from the motor 23, and can suppress the inverter 61 side from becoming high temperature. The heat transferred to the wall 77 of the sensor housing 13 is dissipated from the outer surface of the housing to the outside (outside air). Furthermore, when the water jacket 55 is provided in the motor housing 11 as in the present embodiment, the heat transmitted to the motor housing 11 is also transmitted to the cooling water, and heat can be absorbed more efficiently. Therefore, it is possible to prevent the insulation film of the cable such as the inverter cable 71 and the elements and sensors inside the inverter 61 from becoming high temperature.

  The motor terminal block 70 and the mounting plate 50 are integrated. In order to integrate in this way, first, the mounting plate 50 is manufactured, the manufactured mounting plate 50 is set in a molding machine for injection molding the motor terminal block 70, and the resin is placed in the mold of the molding machine. By injecting the material, the motor terminal block 70 and the mounting plate 50 can be integrated. By doing in this way, the sealing performance between the motor terminal block 70 and the attachment board 50 is securable.

According to this embodiment, since the motor terminal block 70 is attached to the wall portion 77 erected on the sensor housing 13 fastened to the motor housing 11 via the attachment plate 50, the heat generated by driving the motor 23 is generated. A wide heat radiation area for heat radiation can be secured. Therefore, since the heat generated in the motor housing 11 can be efficiently radiated to the housing (sensor housing 13 and motor housing 11) side, it is necessary to consider the influence of heat on the components disposed around the motor housing 11. The reliability can be improved. Further, the degree of freedom in layout of each component constituting the motor unit 100 is increased, and the motor unit 100 can be reduced in size and cost.
In addition, since the mounting plate 50 is firmly fastened and fixed via the wall 77 and the liquid packing, it is also possible to perform a sealing function.

  Furthermore, by attaching the motor terminal block 70 to the wall portion 77 erected in the motor case 15 instead of the outer wall of the motor case 15 itself, a wide heat transfer surface and heat dissipation surface can be secured, and heat can be efficiently used. It can dissipate heat well.

  Moreover, the heat transfer performance can be ensured by forming the mounting plate 50 with a metal having high thermal conductivity such as aluminum. Further, the mounting plate 50 is made of a highly rigid metal, and the contact surface 50A of the mounting plate 50 with the wall portion 77 is formed as a flat surface, so that the mounting plate 50 and the wall portion 77 are securely adhered to each other. It is possible to ensure sealing performance. Furthermore, since the motor case 15 is generally made of metal, the mounting plate 50 and the motor case 15 (wall portion 77) can be firmly fixed using bolts or the like.

  In addition, by integrating the motor terminal block 70 and the mounting plate 50, the motor terminal block 70 can be easily mounted on the motor case 15 (wall portion 77), and work efficiency can be improved. In addition, heat generated by driving the motor 23 can be efficiently transferred from the motor terminal block 70 to the mounting plate 50. Further, by integrating the motor terminal block 70 and the mounting plate 50, the sealing performance between the motor terminal block 70 and the mounting plate 50 can be ensured.

  Furthermore, since a plurality of motor terminal connection portions 62 and inverter cable connection portions 63 are formed on the motor terminal base 70 so that a plurality of motor terminals 73 and inverter cables 71 can be bundled, heat can be efficiently radiated, Strength can be improved.

The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention. In other words, the specific structures and materials described in the embodiments are merely examples, and can be changed as appropriate.
For example, in the present embodiment, the case where the mounting plate is formed of aluminum has been described. However, the mounting plate may be formed of a material having a high heat transfer coefficient such as copper.
Moreover, in this embodiment, although three opening parts which can be penetrated with respect to each of the three inverter cable connection parts of the motor terminal block were formed, all the inverter cable connection parts can be inserted through one opening part. It may be.
Moreover, although the case where it connected with the motor terminal block by cable connection was demonstrated in this embodiment, you may make it connect using a bus bar.
In the present embodiment, the mounting plate is formed in a plate shape, but the mounting plate 150 is formed in a substantially L-shaped cross section as shown in FIG. 7 to further increase the contact area between the mounting plate 150 and the wall portion. At the same time, the strength of the motor terminal block may be further improved. In addition, you may make it improve a heat absorption performance by providing a fin in the motor terminal block 70 side (inner side) part of the part along the opening part 78 of the mounting plate 150.

Also, when oil is used to cool the motor (in the case of an oil-cooled motor), if the oil scattered by the rotation of the rotor of the motor hits the motor terminal block and the mounting plate, it will be cooled efficiently. Can do.
Further, by setting the oil passage of the lubricating oil supplied for the lubrication of the bearing so as to pass through the vicinity of the mounting plate, the cooling can be efficiently performed without increasing the number of parts.
Furthermore, set the bearing lubricating oil so that it passes through the vicinity of the mounting plate, and further branch off the oil passage to drop the lubricating oil onto the motor terminal block and mounting plate, or to eject the lubricating oil to the motor terminal. It can cool efficiently by making it hit against a stand and a mounting plate.

It is a schematic structure sectional view of a motor unit in an embodiment of the present invention. It is a top view of a motor terminal block (including a mounting plate) in an embodiment of the present invention. FIG. 3 is a view taken in the direction of arrow B in FIG. 2. It is C arrow line view of FIG. It is sectional drawing which follows the DD line | wire of FIG. FIG. 2 is a detailed view of part A in FIG. 1. It is sectional drawing which shows another aspect of the motor terminal block (an attachment board is included) in embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Power train (Vehicle power train) 15 ... Motor case 23 ... Motor 25 ... Rotation sensor 50, 150 ... Mounting plate 50A ... Contact surface 61 ... Inverter 70 ... Motor terminal block 71 ... Inverter cable 73 ... Motor terminal 77 ... Wall 100 ... Motor unit

Claims (5)

A motor case containing a motor;
In motor unit and a motor terminal block attached to the wall portion of the motor case,
A mounting plate is provided between the motor terminal block and the wall;
The wall portion is an internal wall standing upright inside the motor case,
The inner wall is formed with an opening through which the motor terminal block can be inserted and can hold the motor terminal block.
The motor terminal block is configured to cover the periphery of the conductive member with a cylindrical insulating member,
The insulating member is formed with a protruding portion protruding outward from the outer peripheral surface of the motor terminal block,
The mounting plate is formed with a through-hole through which the motor terminal block can be inserted,
The mounting plate is disposed between the protruding portion of the insulating member and the inner wall,
When the motor terminal block is attached to the motor case, the peripheral portion of the through hole of the mounting plate is positioned closer to the conductive member than the peripheral portion of the opening of the inner wall. And
The mounting plate is made of metal, and at least a contact surface with the wall is formed as a flat surface,
The motor unit, wherein the wall portion and the flat surface of the mounting plate are firmly fixed.   2. The motor unit according to claim 1, wherein the wall portion and the flat surface of the mounting plate are closely fixed via a liquid packing.   The motor unit according to claim 1, wherein the motor terminal block and the mounting plate are integrated. One end of the motor terminal block is configured to be capable of binding a plurality of motor terminals of the motor,
The motor unit according to claim 1, wherein the other end of the motor terminal block is configured to be capable of binding a plurality of inverter cables of the inverter. The motor terminal block is attached so as to pass through an opening formed in the wall,
2. The motor unit according to claim 1, wherein the mounting plate is formed in a substantially L-shaped cross section so as to follow the contact surface with the wall and the opening.

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