JP5128373B2 - Vehicle drive motor unit - Google Patents

Description

  The present invention relates to a vehicle drive motor unit.

For example, some vehicle air conditioners are provided with an electric compressor to electrically drive the compressor during idle stop. In this compressor, a motor unit and a compressor unit are integrated, and a switching element and a smoothing capacitor constituting a drive circuit (inverter) are directly fixed to a housing wall surface (see Patent Document 1).
JP 2003-324903 A

In the above prior art, since the switching element and the smoothing capacitor of the motor drive circuit are integrally fixed to the motor housing, the switching element and the smoothing capacitor are integrally cooled with the motor. As a result, when setting the heat-resistant temperature, the motor with high heat-resistant temperature is restricted by the heat-resistant temperature of switching elements and smoothing capacitors with low heat-resistant temperature, and as a result, the motor is enlarged to reduce the amount of generated heat Therefore, there is a problem that the whole unit becomes large.
On the other hand, it is possible to form the motor casing and the drive circuit casing separately and fix them together. However, considering the connection of the energization line from the drive circuit to the motor, they are rigid without positional displacement. There is a problem that it is difficult to fix while securing.

  In view of this, the present invention provides a vehicle drive motor unit in which a motor and a drive circuit for driving the motor are separately housed in a casing, and both of them are rigid and fastened without variation, and the connection reliability of the energization line can be maintained. The purpose is to provide.

  In order to achieve the above object, the invention described in claim 1 includes a motor housing (for example, the motor housing 7 in the embodiment) having a divided structure that is assembled by fastening a plurality of cases, and a motor (for example, in the embodiment). A motor drive motor unit configured by fastening a power drive unit case (for example, the power drive unit case 9 in the embodiment) that houses a drive circuit of the motor 3) (for example, the power drive unit 8 in the embodiment); One case provided with a connecting portion (for example, connection terminals 21U, 21V, 21W in the embodiment) of the energization line (for example, the energization lines 20, 20, 20 in the embodiment) extending from the drive circuit among the plurality of cases. (For example, the side case 5 in the embodiment) and the above One end side of the word drive unit case is fixed, and the other end side of the power drive unit case is deformable via another L-shaped bracket (for example, the bracket 50 in the embodiment) (for example, the transmission case 6 in the embodiment). Are fixed by bolts (for example, the bolt 47 and the fixing bolt 53 in the embodiment).

  According to the second aspect of the present invention, in the L-shaped bracket, one mounting wall (for example, the lateral wall 52 in the embodiment) has a screw hole (for example, the screw hole 34 in the embodiment) on the other mounting wall ( For example, the vertical wall 51 in the embodiment is provided with an insertion hole (for example, the insertion hole 56 in the embodiment) of a bolt (for example, the fixing bolt 53 in the embodiment).

  The invention described in claim 3 is characterized in that an easily flexible portion (for example, the easily flexible portion 54 in the embodiment) is provided at the base of at least one of the one mounting wall and the other mounting wall of the bracket. And

  The invention described in claim 4 is characterized in that the bracket is formed of a damping material.

  The invention described in claim 5 is characterized in that the center of gravity of the drive circuit is set closer to the other end side of the power drive unit case.

According to the first aspect of the present invention, the motor housing and the power drive unit case are formed separately, and one case provided with the connection portion of the energization line is fixed to one end side of the power drive unit case. There is an effect that the connection rigidity can be secured while securing the connection of the line.
In addition, since the motor housing is divided by fixing the other end of the power drive unit case with a bolt via an L-shaped bracket, the displacement of the mounting position between the housings is absorbed by deformation of the bracket, and the power is On the other end side of the drive unit case, the other case and the other end side of the power drive unit case can be fixed without misalignment.
According to the invention described in claim 2, a bolt is fastened to a screw hole provided in one mounting wall of the bracket, the bracket is attached to the other case or the power drive unit case, and the bracket is provided on the other mounting wall of the bracket. There is an effect that the power drive unit case can be attached to the other case by inserting a bolt into the insertion hole and fastening the other mounting wall of the bracket to the power drive unit case or the other case.
According to the third aspect of the present invention, even if the positions of the mounting surfaces of the power drive unit case and the other case corresponding to the one mounting wall and the other mounting wall are deviated, the one mounting wall is attached by the easily flexible portion. By changing the positional relationship between the wall and the other mounting wall, the positional relationship between the mounting surface of the other case and the power drive unit case and the mounting surface of both mounting walls of the bracket can be adjusted, and both can be securely attached. effective.
According to the invention described in claim 4, by adopting a structure in which the motor housing and the power drive unit case are separately configured and fixed, vibration of one case is caused to occur from one end side to the other end side of the power drive unit case. Even if vibration is transmitted to the other end side of the power drive unit case, the bracket is formed of a damping material, so that the vibration of the power drive unit case with respect to the motor housing can be suppressed, and the vibration suppressing effect can be achieved. There is an effect that can be demonstrated.
According to the fifth aspect of the present invention, even if the motor housing vibrates, the center of gravity of the power drive unit case is the other end side opposite to the side where the energizing line is provided. There is an effect that can prevent that.

Next, embodiments of the present invention will be described with reference to the drawings. In this embodiment, a vehicle drive motor unit is applied to a fuel cell vehicle. In each figure, R represents the right side and Fr represents the front side.
FIG. 1 shows a front portion of a fuel cell vehicle. A motor unit 2 for driving a vehicle is disposed in a motor room 1 at the front of the vehicle body with the axial direction of the motor 3 directed in the vehicle width direction. . A fuel cell (FC) is connected to the power drive unit 8 which is a drive circuit of the motor 3 of the motor unit 2.

  As shown in FIGS. 2 to 5, the motor unit 2 is an aluminum member, and a plurality of cases, that is, the motor case 4, the side case 5, and the transmission case 6 are fastened in the axial direction (vehicle width direction) of the motor 3. The motor housing 7 having a divided structure that is assembled in the same manner, and a power drive unit case that is fastened to the upper portion of the motor housing 7 and that is provided in a range extending from the side case 5 to the position across the boundary between the transmission case 6 and the motor case 4 9. The power drive unit case 9 is also an aluminum member and accommodates the power drive unit 8 therein.

Specifically, the motor housing 7 includes a cylindrical motor case 4 that covers the motor 3 from the periphery. A transmission case 6 that houses a transmission 10 is disposed around the motor case 4 at the left end of the motor case 4. The plurality of mounting seats 11 are attached by fixing bolts 12 inserted in the vehicle width direction. A plurality of gears and a differential gear (not shown) are accommodated in the mission case 6, and the mission case 6 is divided into an outer case 13 and an inner case 14 which are fixed by connecting bolts 15.
On the other hand, a plurality of mounting seats 16, 16... Are provided around the right end of the motor case 4, and the side case is fixed by fixing bolts 17 inserted inward in the vehicle width direction at these mounting seats 16, 16. 5 is attached.

Here, in the upper part in the side case 5, the connection terminals 21U, 21V, and 21W of the energization lines 20, 20, and 20 extending downward from the lower side of the right end of the power drive unit 8 are the U phase, V phase, and W phase. It is provided corresponding to. The upper part of the connection terminals 21U, 21V, 21W is configured as a PDU connection part 23 having an opening 22 for receiving the energization lines 20, 20, 20 at the upper part, and a lid 31 opens and closes the side wall of the PDU connection part 23. A working hole 25 for connecting the energized line is formed.
The PDU connection portion 23 is formed in a rectangular shape, and a flange portion 26 is formed around the opening portion 22. Four mounting bolts 27 are inserted into the flange portion 26 from the lower side.

In the side case 5, fixed seats 28 and 28 for the power drive unit case 9 are formed so as to protrude in the upward direction at positions closer to the motor case 4 than the PDU connection portion 23 and away from each other. . A hollow knock pin 29 is mounted on each of the fixed seats 28 and 28, and a screw hole 30 is provided in the fixed seat 28 at a portion corresponding to the center portion of the knock pin 29.
A front mounting seat 32 (see FIG. 4) and a rear mounting seat 33 (see FIG. 2) facing the front side are formed on the front side and the rear side of the inner case 14 of the mission case 6, respectively. Screw holes 34 are formed in the mounting seats 32 and 33.

The power drive unit case 9 accommodates therein a power drive unit 8 having a switching element and a smoothing capacitor. The power drive unit case 9 is set so as to fit within the width of the motor housing 7 in the front-rear direction. 7 functions as a barrier in the front-rear direction to prevent the power drive unit 8 from being crushed and deformed. The power drive unit case 9 is a member in which a base plate 35 is fixed by a plurality of bolts 41 at a lower portion of a frame-like case main body 40 in which a corner portion on the rear right side is cut out. In the base plate 35, an opening 36 (only the reference numeral is described together with the opening 22 in FIG. 5) is formed at a position corresponding to the opening 22 of the side case 5, and a mounting surface 37 around the opening 36 (FIG. 5). (Only the reference numeral is described together with the flange portion 26) is in surface contact with the flange portion 26 of the side case 5 so as to be surely sealed. It is also possible to interpose a sealing material at this surface contact portion. A screw hole (not shown) for the mounting bolt 27 is provided around the mounting surface 37.
The U-phase, V-phase, and W-phase energization lines 20, 20, 20 extend downward from the opening 36 of the power drive unit case 9.

  A flange portion f is formed in the lower portion of the case main body 40 of the power drive unit case 9, and the flange portion f is superposed on the peripheral edge portion of the base plate 35. Mounting portions 42 and 43 are provided at the right corner portions of the flange portion f of the case body 40 and the peripheral portion of the base plate 35 corresponding to the front mounting seat 32 and the rear mounting seat 33 of the transmission case 6 of the motor housing 7. ing. Corresponding to the fixed seats 28, 28 of the side case 5 of the motor housing 7, the mounting portions 44, 44 have receiving portions (not shown) for the knock pins 29 on the flange portion f of the case body 40 and the peripheral portion of the base plate 35. Is provided. As shown in FIG. 2, a flange 45 is formed on the upper edge of the case body 40 to which the power drive unit case 9 of the air pump shown in FIG.

  Bolts 46 that are screwed into the screw holes 30 of the fixed seat 28 are respectively inserted into the mounting portions 44 and 44 of the base plate 35 and the flange portion f of the case main body 40, and the mounting portions 42 and 43 of the base plate 35 and the flange of the case main body 40 are inserted. Bolts 47 that are screwed into the screw holes 34 of the lateral wall 52 of each bracket 50 are inserted into the portion f. A fixing bolt 53 is inserted through the vertical wall 51 of each bracket 50, and the fixing bolt 53 is fastened and fixed to the screw holes 34 of the front mounting seat 32 and the rear mounting seat 33.

  As shown in FIGS. 6 and 7, the bracket 50 is a member formed by bending a vertical wall 51 and a horizontal wall 52 into an L shape using a steel plate material, preferably a damping steel plate. As such a damping steel plate, a member in which steel plates having different frequencies such as those used in an exhaust system of an engine vehicle or the like can be used. Here, the bracket 50 is provided at two positions (FIGS. 2 and 4) on the rear side and the front side, but since both have the same structure, the bracket 50 used for the mounting portion 43 shown in FIG. An example will be described.

The vertical wall 51 of the bracket 50 is formed to be about 1/2 of the thickness of the horizontal wall 52, and the ends of the vertical wall 51 and the horizontal wall 52 are formed in an arc shape. An insertion hole 56 is formed in the vertical wall 51, and a screw hole 34 is formed in the horizontal wall 52.
Here, an insertion hole 55 is formed in the attachment portion 43 and the flange portion f of the case main body 40, and a bolt 47 is inserted into the insertion hole 55, and the screw hole 34 formed in the lateral wall 52 of the bracket 50. It is fastened to the fastening.
Further, the insertion hole 56 of the vertical wall 51 is formed with a margin so that the fixing bolt 53 can be positioned in the vertical direction and the left-right direction, and the fixing bolt 53 inserted into the insertion hole 56 is formed in the front mounting seat 33. The screw hole 34 is fastened and fixed.
The vertical wall 51 of the bracket 50 is provided with an easily flexible portion 54 that is recessed in an arc shape from the base portion of the horizontal wall 52 toward the vertical wall 51 in the vicinity of the corner portion and can be easily deformed in the width direction. Is formed.

Therefore, in the power drive unit case 9, the flange portion 26 of the side case 5 positions the mounting surface 37 around the opening 36 of the power drive unit case 9 in the horizontal direction with respect to the side case 5 that is one end side of the motor housing 7. The flange portion of the case main body 40 of the power drive unit case 9 is tightened with the mounting bolt 27 and positioned in the horizontal direction and the height direction with respect to the screw hole 30 of the fixed seat 28 of the side case 5 via the knock pin 29. F and the bolt 46 inserted into the mounting portion 44 of the base plate 35 are tightened.
Further, on the other end side of the power drive unit case 9, the flange portion f and the mounting portions 42 and 43 of the case main body 40 are connected to the bolts 47, 43 on the front mounting seat 32 and the rear mounting seat 33 of the transmission case 6 via the bracket 50. 47 and fixing bolts 53, 53.

Next, a procedure for assembling the motor housing 7 and the power drive unit case 9 will be described.
The bolts 47 are inserted into the flange portion f and the attachment portions 42 and 43 of the case main body 40 of the power drive unit case 9 in advance and temporarily tightened into the screw holes 34 of the lateral wall 52 of each bracket 50.
Next, the flange portion 26 of the side case 5 is aligned with the mounting surface 37 around the opening 36 on one end side of the base plate 35 of the power drive unit case 9, and the hollow knock pin of each fixed seat 28 provided in the side case 5 29 is inserted and positioned in the receiving portion of the mounting portion 44 of the base plate 35 of the power drive unit case 9, and the mounting bolt 27 is tightened to the mounting surface 37 of the power drive unit case 9 from the bottom to the top, and the bolt 46 is tightened. Tighten to each fixed seat 28.
Then, the fixing bolt 53 is inserted into the insertion hole 56 of the vertical wall 51 of each bracket 50 to fasten and fix the vertical wall 51 to the front mounting seat 32 and the rear mounting seat 33. At this time, the bolt 47 is also tightened.
Thereafter, the lid 31 of the side case 5 is opened, and the energization lines 20, 20, 20 are connected to the connection terminals 21 U, 21 V, 21 W through the energization line connection work hole 25.

  According to the above embodiment, the motor housing 7 and the power drive unit case 9 are formed separately, and the flange portion 26 of the side case 5 provided with the connection terminals 21U, 21V, 21W of the energization lines 20, 20, 20 is powered. By fixing with the mounting bolts 27 to the mounting surface 37 around the opening 36 on one end side of the base plate 35 of the drive unit case 9, the connection of the energization lines 20, 20, 20 is secured and both are positioned in the vertical direction. The mounting rigidity can be ensured in the state. At this time, similarly, the power drive unit case 9 is fixed without displacement because positioning is performed in the vertical direction by the fixed seat 28 provided in the side case 5 and horizontal positioning is performed by the hollow knock pin 29 provided in the fixed seat 28. it can.

Further, on the other end side of the power drive unit case 9, the flange portion f and the mounting portions 42 and 43 of the case main body 40 are connected to the bolts 47, 43 on the front mounting seat 32 and the rear mounting seat 33 of the transmission case 6 via the bracket 50. 47 and fixing bolts 53, 53.
Therefore, since the motor housing 7 is divided into the motor case 4, the side case 5, and the transmission case 6, and the transmission case 6 is divided into the outer case 13 and the inner case 14, the circumferential displacement between adjacent members is different between each bracket. The vertical wall 51 of the bracket 50 is fixed by the fixing bolt 53 at the end of the assembly even when the vertical wall 51 of the 50 and the front mounting seat 32 and the rear mounting seat 33 are displaced in the mounting surface direction. When tightening to the inner case 14 of the transmission case 6, the vertical wall 51 of the bracket 50 is deformed by the easily deflecting portion 54 and deformed in a direction to contact the front mounting seat 32 and the rear mounting seat 33. Can be absorbed.

  Therefore, the mission case 6 and the other end side of the power drive unit case 9 can be fixed without misalignment on the other end side of the power drive unit case 9. Further, since the insertion hole 56 of the vertical wall 51 of the bracket 50 is inserted with sufficient margin in the vertical direction and the horizontal direction with respect to the fixing bolt 53, positioning can be easily performed when the fixing bolt 53 is tightened.

Here, when the bracket 50 is formed of a damping steel plate, even if vibration is transmitted to the other end side of the power drive unit case 9 whose one end side is fixed to the motor housing 7, due to the damping action of the bracket 50. The vibration of the power drive unit case 9 with respect to the motor housing 7 can be suppressed.
Further, since the center of gravity of the power drive unit 8 accommodated in the power drive unit case 9 is provided closer to the other end side of the power drive unit case 9, even if the motor housing 7 vibrates, the portion that receives this vibration is the energization line 20. , 20, 20 is the side opposite to the side where the cables are wired, so that it is possible to minimize the load on the energization lines 20, 20, 20 and the connection terminals 21U, 21V21W.

  In this way, on one end side of the power drive unit case 9, the energization lines 20, 20, and 20 are connected to the connection terminal 21U at the site of the side case 5 in order to minimize the energization line 20 and minimize the electrical resistance. , 21V, 21W, and adopting a highly rigid fixing form in which the flange portion 26 of the side case 5 is fixed to the mounting surface 37 around the opening portion 36 of the base plate 35 of the power drive unit case 9 with the mounting bolts 27. While improving the reliability, the motor housing 7 is divided into the motor case 4, the side case 5, and the transmission case 6, and the twist generated around the axial direction of the motor 3 is unavoidable on the other end side of the power drive unit case 9. The direction error is absorbed by the bracket 50.

  In addition, this invention is not restricted to the said embodiment, For example, it can apply to the motor unit for a drive of an electric vehicle and a hybrid vehicle besides a fuel cell vehicle. The easily deflecting portion 54 of the bracket 50 may be provided on the horizontal wall 52, or may be provided on both the vertical wall 51 and the horizontal wall 52.

1 is a side view of a vehicle according to an embodiment of the present invention. 1 is a perspective view of an embodiment of the present invention. It is a right view of embodiment of this invention. It is a front view of an embodiment of this invention. 1 is a plan view of an embodiment of the present invention. It is a perspective view of a bracket. It is sectional drawing which follows the AA line of FIG.

Explanation of symbols

3 Motor 5 Side case (one case)
6 Mission case (other cases)
7 Motor housing 8 Power drive unit (drive circuit)
9 Power drive unit case 20 Power line 21U, 21V, 21W Connection terminal (connection part)
47 Bolt 51 Vertical wall (the other mounting wall)
50 Bracket 52 Side wall (one mounting wall)
53 Fixing bolt (bolt)
56 Insertion hole

Claims (5)

  A vehicle drive motor unit configured by fastening a motor housing having a divided structure that is assembled by fastening a plurality of cases and a power drive unit case that accommodates a drive circuit of the motor, and among the plurality of cases, One case having an energization line connection extending from the drive circuit and one end of the power drive unit case are fixed, and the other end of the power drive unit case is bolted to the other case via an L-shaped bracket that can be deformed The vehicle drive motor unit characterized by being fixed by.   2. The vehicle drive motor unit according to claim 1, wherein a screw hole is provided in one mounting wall of the L-shaped bracket, and a bolt insertion hole is provided in the other mounting wall.   3. The vehicle drive motor unit according to claim 1, wherein an easily flexible portion is provided at a base portion of at least one of the one mounting wall and the other mounting wall of the bracket.   The vehicle drive motor unit according to any one of claims 1 to 3, wherein the bracket is formed of a damping material.   The vehicle drive motor unit according to any one of claims 1 to 4, wherein a center of gravity of the drive circuit is set closer to the other end side of the power drive unit case.

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