JP7358112B2 - Electric motor mounting structure - Google Patents

Description

The present invention relates to an electric motor mounting structure suitable for use in a vehicle drive device.

Some hybrid vehicle drive devices have a configuration in which a motor (electric motor) is disposed between an engine and a transmission. For example, Patent Document 1 discloses a drive device in which a motor is housed in a housing that connects an end of an engine and an end of a transmission. In this drive device, the desired rigidity is ensured in the case (motor cover 15) that houses the motor, which is a heavy object, and a flexible structure is provided at the part where the motor case is connected to the transmission or the housing. The aim is to suppress the transmission of radial vibrations to the transmission and housing.

In such a drive device, the motor case (motor cover 15) consists of a case body (motor cover body 15A) with one end open and an end face cover (end face member 15B) fastened to the open end of the case body with bolts. However, the end cover is further composed of a ring-shaped end member main body and a mounting plate that attaches the end member main body to the housing with bolts (bolts 8), and a second It is disclosed that a flexible structure is provided to suppress vibration transmission.

Japanese Patent Application Publication No. 2011-51382

By the way, when the motor case is filled with oil, it is necessary to firmly fasten the end cover to the case body with bolts in order to ensure sealing performance.
In addition, when the end cover is composed of the end member main body and the mounting plate, the connection between the end member main body and the mounting plate must be flexible in order to suppress the transmission of motor vibration to the engine and transmission. There is.

In this way, there are contradictory requirements for the connection between the case body and the end member body of the end cover, and the connection between the end member body and the mounting plate, so it is usually necessary to The connection and the connection between the end face member main body and the mounting plate must be performed individually and independently, resulting in a complicated structure.

The present invention was created with a focus on these issues, and is an electric motor that efficiently achieves the sealing performance of the motor case and the suppression of transmission of motor vibration to the engine and transmission with a simple configuration. The purpose is to provide a mounting structure.

An electric motor mounting structure of the present invention includes an electric motor having a motor case and a motor cover fastened to one end of the motor case, and an annular support plate fastened to one end of the motor case via the motor cover. , the support plate includes a support plate main body and a plurality of fixing seats for fixing the electric motor to the motor support body with fixing bolts, and the fixing seats are arranged on the outer periphery of the support plate main body. A plurality of bolt holes are provided in the supporting plate body in parallel with each other in the circumferential direction in the support plate body, and a plurality of bolt holes are inserted through which fastening bolts for fastening at least the motor cover to one end of the motor case are inserted. A plurality of bolt holes are formed in a row in between, and the plurality of bolt holes include a plurality of bolt through holes through which the head of the fastening bolt passes, and a plurality of normal bolt holes into which the head of the fastening bolt abuts, The bolt through hole is characterized in that it is arranged in the immediate vicinity of the fixed seat.

Among the plurality of fixed seats, the rigidity of the support plate main body at a portion where a pair of fixed seats located at opposing positions is provided is determined by the rigidity of the support plate main body at a portion where a pair of fixed seats located at opposing positions is provided. The rigidity of the supporting plate body is preferably higher than that of the supporting plate body.
It is preferable that a reinforcing rib is provided in the vicinity of the bolt through hole, extending upright from the plate surface of the support plate main body.
Preferably, the reinforcing ribs are formed by bending the support plate main body.
Preferably, the reinforcing rib includes a first rib that extends from the plate surface at a peripheral edge of the bolt through hole.
The reinforcing rib includes a second rib that has at least one of an inner edge and an outer edge of the support plate erected from the plate surface at a circumferential position where the bolt through hole is formed. It is preferable.
The reinforcing rib includes a first rib with a peripheral edge of the bolt through hole erected from the plate surface, and at least an inner edge and an outer edge of the support plate at a circumferential position where the bolt through hole is formed. It is preferable that the plate further includes a second rib, one of the edges of which is erected from the plate surface.
The first rib and the second rib have the same or approximately the same rib width and the same or approximately the same rib height, and the first rib covers the entire peripheral edge of the bolt through hole. the second rib is formed on each of the inner edge and the outer edge over a length of more than half of the circumference of the first rib, and the second rib is formed on each of the inner edge and the outer edge, and the second rib is formed on the inner edge and the outer edge, and the second rib is formed on each of the inner edge and the outer edge, and Preferably, the second rib is formed in the through hole, and the first rib is formed in the bolt through hole closest to the other fixing seat.
Another electric motor mounting structure of the present invention includes an electric motor having a motor case and a motor cover fastened to one end of the motor case, and an annular motor mounting structure fastened to one end of the motor case via the motor cover. a support plate, the support plate includes a support plate main body, and a plurality of fixing seats for fixing the electric motor to a motor support with fixing bolts, and the fixing seats are attached to the support plate. A plurality of bolt holes are provided circumferentially on the outer periphery of the main body, and the support plate main body has a plurality of bolt holes through which at least fastening bolts for fastening the motor cover to one end of the motor case are inserted. A plurality of bolt holes are formed in a line between the parts, and the plurality of bolt holes include a plurality of bolt through holes through which the heads of the fastening bolts pass, and a plurality of normal bolt holes into which the heads of the fastening bolts abut. The bolt through hole is arranged between the fixing seat and the normal bolt hole.

According to the present invention, since the motor cover is firmly fastened to the motor case using a large number of fastening bolts, it is possible to ensure sealing between the motor cover and the motor case. On the other hand, since the motor cover is fastened to the support plate using only the fastening bolts at a location distant from the fixed seat, transmission of motor vibrations to the motor support side is suppressed.

FIG. 4 is a front view (a view taken in the direction of arrow A in FIG. 3) of a support plate and a motor cover of the electric motor mounting structure according to one embodiment. FIG. 1 is a schematic diagram showing a drive system of a hybrid vehicle to which an electric motor mounting structure according to an embodiment is applied. FIG. 1 is a longitudinal cross-sectional view of an electric motor to which an electric motor mounting structure according to an embodiment is applied, showing only one (half) of the rotation center. 4(a) is a partial front view of the support plate; FIG. 4(b) is a sectional view taken along line BB in FIG. 4(a); FIG. (c) is a sectional view taken along the line CC in FIG. 4(a), and (d) is a sectional view taken along the line DD in FIG. 4(a). FIG. 6 is a front view of a support plate showing an example of the arrangement of bolt holes in the support plate of the electric motor mounting structure according to a modification of the embodiment, in which (a) shows the first example, and (b) shows the second example. (c) shows the third example.

Embodiments of the present invention will be described below with reference to the drawings. Note that the embodiments shown below are merely examples, and there is no intention to exclude the application of various modifications and techniques that are not explicitly shown in the embodiments below. Each configuration of the following embodiments can be implemented with various modifications without departing from the spirit thereof, and can be selected or combined as necessary.

[Configuration of drive system of hybrid vehicle]
As shown in FIG. 2, the electric motor mounting structure according to this embodiment is applied to a drive system of a hybrid vehicle. This hybrid vehicle includes an engine (internal combustion engine) 1 as a drive source, a motor (electric motor) 2 as a drive source, a transmission (in this case, continuously variable transmission) 3, a speed reducer 4, and a differential It includes a mechanism 5 and a drive wheel 6. By connecting and disconnecting a clutch mechanism (not shown) and controlling the motor 2, the driving force of one or both of the engine 1 and the motor 2 can be transmitted to the drive wheels 6 to drive the vehicle.

A housing 10 is interposed between the engine 1 and the transmission 3, and is bolted to both the cylinder block of the engine 1 and the casing of the transmission 3. The housing 10 functions as a support for the motor 2, and the motor 2 is accommodated in the internal space of the housing 10.

[Configuration of electric motor mounting structure]
As shown in FIG. 3, the motor 2 includes a rotor 23, a stator 24, and an input shaft connected to the rotating shaft of the engine 1, which are arranged in a motor case 21 with one end open, with a rotation center CL as a reference. 25, an output shaft 27 connected to the rotor 23, and connected to the input shaft 25 via a clutch (for example, a multi-disc clutch) 26. A motor cover 22 is fastened to the opening of the motor case 21 with bolts (fastening bolts) 41 and 42 . Note that the bolts 41 and 42 may be of the same standard or may be of different standards.

An annular support plate 30 is fastened to the motor cover 22 with bolts 42, and this support plate 30 is fixed to the housing 10, which is a motor support.
Therefore, the motor cover 22 is fastened to the motor case 21 by bolts 41 and 42, and to the support plate 30 by bolts (fastening bolts) 42.

The inside of the motor case 21 of the motor 2 of this embodiment is filled with oil, and the motor cover 22 is firmly attached to the motor case 21 (that is, with high coupling rigidity) to prevent the oil inside the motor case 21 from leaking. It is necessary to conclude.
On the other hand, since the vibration of the motor 2 is transmitted to the housing 10 via the support plate 30, in order to suppress the vibration transmission from the motor 2 to the housing 10, the motor cover 22 is attached to the housing 10 via the support plate 31. It is necessary to connect them flexibly (with low rigidity).

As shown in FIG. 1, the support plate 30 includes an annular support plate main body 30 and a plurality of fixing bolts 43 (see FIG. 3) for fixing the motor 2 to the housing (motor support) 10. 4) fixed seat portions 32. The plurality of fixing seats 32 are arranged at equal intervals in the circumferential direction of the support plate main body 31, and each fixing seat 32 has a bolt hole 36 formed therein. The support plate 30 is fixed to the housing 10 by abutting these fixing seats 32 against the fixing part 10a of the housing 10, and inserting fixing bolts 43 into the bolt holes 36 and tightening them.

Further, the support plate main body 31 has a plurality of bolt holes 33, 34, 35 through which fastening bolts 41, 42 for fastening the motor cover 22 to one end of the motor case 21 are inserted, between the adjacent fixed seats 32. Multiple formations have been formed. The bolt holes 33, 34, and 35 are arranged along the annular shape of the support plate main body 31 at a predetermined close distance.

Among the plurality of bolt holes 33, 34, 35, the bolt holes 33, 34 are bolt through holes through which the head of the fastening bolt 42 passes, and the remaining bolt hole 35 is a normal bolt hole where the head of the fastening bolt 41 comes into contact. It is. In the example shown in FIG. 1, a first bolt through hole 33 and a second bolt through hole 34 (also simply referred to as bolt through holes 33 and 34) are formed in the immediate vicinity of the fixed seat portion 32. A bolt hole 35 is usually formed at a location between the two and spaced apart from the fixed seat part 32. In other words, the bolt through holes 33 and 34 are formed between the fixed seat portion 32 and the normal bolt hole 35, and the normal bolt hole 35 is formed between the bolt through holes 33 and 34. Thereby, the distance between the fixed seat part 32 and the normal bolt hole 35 can be increased, that is, the fixed seat part 32 and the normal bolt hole 35 can be spaced apart.

The fastening bolts 41, which are normally inserted into the bolt holes 35, are fastened together by fastening the motor cover 22 and the support plate 30 to the fastening seats 21a formed around the opening of the motor case 21. , 34 fastens only the motor cover 22 to the fastening seat 21a of the motor case 21.

As a result, the motor cover 22 is firmly fastened to the motor case 21 by a large number of bolts 41 and 42 adjacent to each other at a short distance. Therefore, the sealing performance between the motor cover 22 and the motor case 21 is ensured, and the oil in the motor case 21 can be prevented from leaking from the gap with the motor cover 22.

On the other hand, the support plate 30 is fastened to the motor cover 22 only by fastening bolts 42 at locations spaced apart from the fixed seat portion 32. The vibrations of the motor 2 are transmitted from the motor cover 22 to the housing 10 via the fastening bolts 42, the support plate 30, the fixed seat portion 32, and the fixing bolts 43, but the fastening bolts 42 and the fixing bolts 43 are separated from each other. The vibration is attenuated by that amount, and the transmission of the vibration of the motor 2 to the housing 10 is suppressed.

Further, as shown in FIG. 4, the bolt through holes 33 and 34 are provided with reinforcing ribs (rigidity-enhancing ribs) 37 and 38 that stand up from the plate surface 31a of the support plate main body 31. In addition, FIG. 4(a) shows a plurality of types of reinforcing ribs 37, 38 on one support plate 30 in order to compare and explain each bolt hole 33, 34, 35. It does not indicate the actual arrangement of 34 and 35.

When the bolt holes 33, 34, and 35 are formed in the support plate body 31, the rigidity of this portion of the support plate body 31 is reduced. Since the hole diameters of the bolt through holes 33 and 34 are usually larger than the hole diameter of the bolt holes 35, the reduction in the cross-sectional area of the support plate body 31 significantly reduces the rigidity and strength of the support plate 30. The reinforcing ribs 37 and 38 are provided to ensure the strength (torque resistance, vibration resistance) and rigidity for the support plate 30 to support the motor 2.

The reinforcing ribs 37 and 38 are formed into flanges by bending the support plate main body 31. Among these, the reinforcing rib 37 is a first rib that extends from the plate surface 31a at the peripheral edge of the first bolt through hole 33. Further, the reinforcing rib 38 is a second rib that stands up from the plate surface 31a at the inner edge 31b and outer edge 31c of the support plate main body 31 at the circumferential position where the second bolt through hole 34 is formed.

In this embodiment, the first rib 37 and the second rib 38 are formed so that the rib widths W1 and W2 are the same or approximately the same, and the rib heights H1 and H2 are the same or approximately the same. The first rib 37 is formed around the entire circumference of the bolt through hole 33, and the second rib 38 is formed on each of the inner edge 31b and the outer edge 31c over a length of more than half of the entire circumference of the first rib 37. It is formed.

The first rib 37 and the second rib 38 improve the bending rigidity around the bolt through holes 33 and 34, but for example, when viewed in the radial direction of the motor cover 22, Since the distance D2 is larger than the distance D1 of the first rib 37 from the center of the bolt through hole 33, the section modulus becomes larger and the rigidity and strength are further improved. The same tendency occurs in the circumferential direction of the motor cover 22, and the area around the second bolt through hole 34 has higher rigidity and strength than the area around the first bolt through hole 33.

In the present embodiment, the rib width W2 and the rib height H2 are gradually reduced at both ends of the second rib 38, in order to alleviate stress concentration in these parts. Even considering this portion, the area around the second bolt through hole 34 is formed to have higher rigidity and strength than the area around the first bolt through hole 33.

In addition, the rib width W2, rib height H2, and rib length of the first rib 37 and the second rib 38 are the radial length of the annular support plate main body 31 (distance between the inner edge 31b and the outer edge 31c). , the hole diameters of the bolt through holes 33 and 34, and the size of the gap in the surrounding space in the thickness direction of the support plate main body 31, but the rib width W2 and the rib height of the first rib 37 and the second rib 38 By setting H2 and the rib length to a certain value or more, it is possible to improve the rigidity and strength of the area around the bolt through holes 33 and 34 compared to the area around the normal bolt hole 35.

By reinforcing (increasing rigidity) by the first rib 37 and the second rib 38, the rigidity balance around the fixed seat part 32 is adjusted, and vibrations in the axial direction (out-of-plane direction) of the motor 2 [out-of-plane direction (in-plane direction) It is possible to induce a vibration that deforms in a direction perpendicular to the direction (orthogonal to the direction), so-called out-of-plane vibration], thereby dispersing vibration energy and reducing the vibration level during resonance. The vibration mode of interest here is a rigid body mode in which the entire motor 2 vibrates.

Furthermore, regarding the vibration of the motor cover 22 and the motor case 21 themselves, by reducing the rigidity by forming a through hole near the fixed seat portion 32, a damping effect against input vibration from the motor 2 can be obtained, and the vibration level can be reduced. Can be done. The vibration mode of the out-of-plane vibration of the motor cover 22 can be adjusted. For example, out-of-plane vibration of the motor cover 22 may induce resonance in the motor cover 22, but this can be avoided. Further, by dissipating the vibration of the motor 2 into out-of-plane vibration that does not induce resonance, vibration in the direction of shaft wobbling (in-plane vibration) can be suppressed.

In this embodiment, as shown in FIG. 1, among two sets (four in total) of fixed seats 32 facing each other, a pair of fixed seats 32, 32 located at locations indicated by P1 and P3 in FIG. A first bolt through hole 33 with relatively low rigidity is formed in the vicinity of each of the holes, and a relatively low rigidity bolt through hole 33 is formed in the vicinity of the remaining pair of fixing seats 32, 32 located at the locations indicated by P2 and P4 in FIG. A highly rigid second bolt through hole 34 is formed. This causes out-of-plane vibration in which both the fixed seats 32 at positions P1 and P3, where the first bolt through hole 33 is located, is displaced in an out-of-plane direction, thereby avoiding resonance of the motor cover 22.

[Action and effect]
The electric motor mounting structure according to the present embodiment is configured as described above, and the motor cover 22 is firmly fastened to the motor case 21 by a large number of bolts 41 and 42 adjacent to each other at a short distance. Therefore, the sealing performance between the motor cover 22 and the motor case 21 can be ensured, and the oil in the motor case 21 can be prevented from leaking from the gap with the motor cover 22.

On the other hand, by providing the bolt through holes 33 and 34, the support plate 30 can be fastened to the motor cover 22 with only the bolts 42 at locations distant from the fixed seat part 32. , the vibration of the motor 2 transmitted to the housing 10 via the support plate 30, the fixing seat 32, and the fixing bolt 43 is attenuated by the distance between the fastening bolt 42 and the fixing bolt 43, and the vibration of the motor 2 is damped by the distance between the fastening bolt 42 and the fixing bolt 43. Transmission of (for example, sound vibrations) to the housing 10 is suppressed.
Note that the support rigidity of the motor 2 by the housing 10 can be adjusted by the arrangement of the bolt holes 35 with respect to the fixed seat part 32. It is effective to place

Further, since the diameter of the bolt through holes 33, 34 is usually larger than the diameter of the bolt hole 35, the reduction in rigidity and strength due to the reduction in the cross-sectional area of the support plate main body 31 will be large. Since reinforcing ribs 37 and 38 are provided around the plate surface 31a of the support plate main body 31, a decrease in rigidity and strength is suppressed, and the motor support strength (torque resistance, durability) of the support plate 30 is increased. vibration) and rigidity.

Further, among the two sets of fixed seats 32 facing each other, a first bolt through hole 33 having relatively low rigidity is formed in each of the pair of opposing fixed seats 32, 32, and the remaining pair of fixed seats 32, 32 are each formed with a second bolt through hole 34 having relatively high rigidity, and the rigidity of the pair of fixed seat parts 32, 32 located at opposite positions is higher than that of the other pair located between these fixed seat parts. The rigidity is higher than that of the fixed seats 32, 32. Utilizing this difference in rigidity, the vibration characteristics of the motor 2 (for example, the sound vibration characteristics ) can be improved.

〔others〕
Although the embodiments have been described above, the arrangement and shape of the support plate and bolt through holes of the present invention, and the arrangement and shape of the reinforcing ribs of the bolt through holes are not limited to those of the above embodiments.
For example, as shown in FIGS. 5(a) to 5(c), the fixed seats 32 may be provided at three locations.

In FIG. 5(a), fixed seats 32a to 32c are provided at equal intervals in the circumferential direction, and two relatively rigid second bolt through holes 34 are formed near the two fixed seats 32a and 32b, respectively. However, two first bolt through holes 33 having relatively low rigidity are formed near the remaining fixed seat portion 32c. Further, the area around the bolt through hole 33 has the same rigidity as the area around the normal bolt hole 35.

As a result, as shown by the white arrow in FIG. A vibration mode can be induced.

In FIG. 5(b), two fixed seat parts 32b and 32c are arranged close to each other in the circumferential direction so as to face one fixed seat part 32a, and a relatively rigid groove is arranged near the fixed seat part 32a. Two 2-bolt through holes 34 are formed, and three first bolt through holes 33 having relatively low rigidity are formed near the remaining two fixed seats 32b and 32c. Further, the area around the bolt through holes 33 and 34 is made more rigid than the area around the normal bolt hole 35.

As a result, the diameter connecting the fixed seat part 32a provided with the second bolt through hole 34 and the fixed seat parts 32b and 32c provided with the first bolt through hole 33 becomes a fulcrum, and the outline shown in FIG. As shown by the arrows, out-of-plane vibration is generated with out-of-plane displacement points at the portion between the fixed seat portion 32a and the fixed seat portion 32b, and the portion between the fixed seat portion 32a and the fixed seat portion 32c. It can be triggered.

In FIG. 5(c), the fixed seat part 32a and the fixed seat part 32b are arranged so as to face each other on one diameter, and the remaining fixed seat part 32c is arranged, and the fixed seat part 32a and the fixed seat part 32b and 90 °They are arranged out of phase in the circumferential direction. Two or three second bolt through holes 34 having relatively high rigidity are formed near the fixed seat parts 32a and 32b, and a first bolt through hole having relatively low rigidity is formed near the remaining fixed seat part 32c. 33 are formed. Further, the area around the bolt through holes 33 and 34 is made more rigid than the area around the normal bolt hole 35.

As a result, the diameter connecting the fixed seat part 32a with the second bolt through hole 34 and the fixed seat part 32b becomes a fulcrum, and as shown by the white arrow in FIG. 5(c), the fixed seat part 32c and It is possible to induce out-of-plane vibration with the portion where the fixed seat facing this is not provided as an out-of-plane displacement point.

In the above embodiment, the second rib 38 is provided on both the inner edge 31b and the outer edge 31c, but it may be provided on only one side, and the first rib 37 is provided on the entire circumference of the first bolt through hole 33. Although it is provided around the circumference, it may be provided only in a part.
Further, the reinforcing rib formed around the bolt through hole is not limited to the shape of the embodiment. Further, instead of the reinforcing ribs, rigidity may be ensured by increasing the thickness of the portion around the bolt through hole of the support plate compared to the other portions.

1 Engine (internal combustion engine)
2 Motor (electric motor)
3 Transmission (continuously variable transmission)
4 Reduction gear 5 Differential mechanism 6 Drive wheel 10 Housing 10a Fixed part 21 Motor case 21a Fastening seat part 22 Motor cover 23 Rotor 24 Stator 25 Input shaft 27 Output shaft 30 Support plate 31 Support plate main body 31a Plate surface of support plate main body 31b Inner edge of support plate body 31c Outer edge of support plate body 32 Fixed seat 33 First bolt through hole 34 Second bolt through hole 35 Normal bolt hole 36 Bolt hole 37 First reinforcing rib 38 Second reinforcing rib 41, 42 Fastening bolt 43 Fixing bolt CL Rotation center

Claims (9)

an electric motor having a motor case and a motor cover fastened to one end of the motor case;
an annular support plate fastened to one end of the motor case via the motor cover;
The support plate is composed of a support plate main body and a plurality of fixing seats for fixing the electric motor to the motor support body with fixing bolts,
The fixed seat portions are provided on the outer periphery of the support plate main body in a circumferential direction,
A plurality of bolt holes through which fastening bolts for fastening at least the motor cover to one end of the motor case are inserted are formed in the support plate main body, and a plurality of bolt holes are formed in a line between adjacent fixed seat parts,
The plurality of bolt holes are comprised of a plurality of bolt through holes through which the heads of the fastening bolts pass, and a plurality of normal bolt holes into which the heads of the fastening bolts abut,
The electric motor mounting structure is characterized in that the bolt through hole is arranged in close proximity to the fixed seat. Among the plurality of fixed seats, the rigidity of the support plate main body at a portion where a pair of fixed seats located at opposing positions is provided is determined by the rigidity of the support plate main body at a portion where a pair of fixed seats located at opposing positions is provided. The electric motor mounting structure according to claim 1, wherein the rigidity of the supporting plate body is higher than that of the supporting plate main body. 2. The electric motor mounting structure according to claim 1, further comprising a reinforcing rib that stands up from the plate surface of the support plate body near the bolt through hole. 4. The electric motor mounting structure according to claim 3, wherein the reinforcing rib is formed by bending the support plate main body. 5. The electric motor mounting structure according to claim 4, wherein the reinforcing rib includes a first rib with a peripheral edge of the bolt through hole erected from the plate surface. The reinforcing rib includes a second rib that has at least one of an inner edge and an outer edge of the support plate erected from the plate surface at a circumferential position where the bolt through hole is formed. The electric motor mounting structure according to claim 4, characterized in that: The reinforcing rib includes a first rib with a peripheral edge of the bolt through hole erected from the plate surface, and at least an inner edge and an outer edge of the support plate at a circumferential position where the bolt through hole is formed. 5. The electric motor mounting structure according to claim 4, further comprising a second rib with either edge thereof erected from the plate surface. The first rib and the second rib have the same or approximately the same rib width and the same or approximately the same rib height, and the first rib covers the entire peripheral edge of the bolt through hole. the second rib is formed on each of the inner edge and the outer edge over a length of at least half of the circumference of the first rib;
Among the plurality of fixed seats, the second rib is formed in the bolt through hole closest to a pair of fixed seats located at opposing positions , and another fixed seat located between the pair of fixed seats 8. The electric motor mounting structure according to claim 7, wherein the first rib is formed in the bolt through hole closest to the bolt through hole. an electric motor having a motor case and a motor cover fastened to one end of the motor case;
an annular support plate fastened to one end of the motor case via the motor cover;
The support plate is composed of a support plate main body and a plurality of fixing seats for fixing the electric motor to the motor support body with fixing bolts,
The fixed seat portions are provided on the outer periphery of the support plate main body in a circumferential direction,
A plurality of bolt holes through which fastening bolts for fastening at least the motor cover to one end of the motor case are inserted are formed in the support plate main body, and a plurality of bolt holes are formed in a line between adjacent fixed seat parts,
The plurality of bolt holes are comprised of a plurality of bolt through holes through which the heads of the fastening bolts pass, and a plurality of normal bolt holes into which the heads of the fastening bolts abut,
The electric motor mounting structure is characterized in that the bolt through hole is arranged between the fixed seat and the normal bolt hole.

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