WO2021131225A1

WO2021131225A1 - Motor-assembly mounting structure

Info

Publication number: WO2021131225A1
Application number: PCT/JP2020/038001
Authority: WO
Inventors: 佑磨田中; 渡邉　和宏
Original assignee: 株式会社明電舎
Priority date: 2019-12-25
Filing date: 2020-10-07
Publication date: 2021-07-01

Abstract

This motor-assembly mounting structure for an electric-vehicle comprises: a motor assembly that has a first housing for accommodating a motor, and a second housing attached to the first housing on the load-opposite end of the motor, for accommodating control components of the motor including the power electrics; a first anchoring part for anchoring the motor assembly to a structural part of the electric vehicle on the load end of the motor; and a second anchoring part for anchoring the second housing to the structural part on the load-opposite end of the motor. The second housing has a mount section for anchoring the motor assembly to the structural part, and a breakaway section that breaks when the second housing is subjected to a load exceeding a predetermined value during a vehicle collision, thereby causing the mount section to separate from the second housing.

Description

Mounting structure of motor assembly

The present invention relates to a mounting structure of a motor assembly for an electric vehicle.

In recent years, from the viewpoint of reducing the environmental load, the development and popularization of electric vehicles equipped with a motor as a power source such as EV, HEV, PHEV, FCV, etc. are progressing. In addition, various proposals have been made to devise the attachment of the vehicle body and the motor, etc., assuming a collision accident in an electric vehicle.

For example, in Patent Document 1, in order to prevent the battery unit from being destroyed due to a collision with a power unit composed of an electric motor or the like in the event of a collision, fragile portions are formed on two brackets in the vehicle front-rear direction that support the power unit. The configuration to be used is disclosed.
Further, in Patent Document 2, in order to prevent the deformation of the side member from being hindered by the control component of the motor attached to the crossbar in the event of a collision, it is controlled by a bracket having a separating portion that separates when a collision load is applied. The configuration for attaching the component to the crossbar is disclosed.

Japanese Patent No. 4888657 Japanese Patent No. 5652604

For motors for electric vehicles, in order to improve vehicle assembly workability and save space, it is also being considered to integrate the motor and the inverter circuit for controlling the motor into one module. In this kind of modularized motor assembly, the inverter circuit including the high power part is covered with a housing to prevent electric shock, but there is a strong demand for a structure that can prevent the high power part from being exposed to the outside even in the event of a collision. There is.

The present invention has been made in view of the above circumstances, and provides a mounting structure of a motor assembly capable of suppressing exposure of a high-power portion to the outside even in the event of a collision of an electric vehicle.

One aspect of the present invention is a mounting structure of a motor assembly for an electric vehicle, in which a first housing for accommodating the motor and a motor mounted on the first housing on the opposite load side of the motor and including a high electric power portion are controlled. A motor assembly having a second housing for accommodating parts, a first fixing portion for fixing the motor assembly to structural parts of an electric vehicle on the load side of the motor, and a second housing on the non-load side of the motor. A second fixing portion for fixing to a structural component is provided. The second housing is vulnerable to a mount portion for fixing the motor assembly to a structural component and a fragile portion that breaks when the second housing receives a load exceeding a predetermined value at the time of a vehicle collision to separate the mount portion from the second housing. It has a part and.

In the mounting structure of the motor assembly described above, the second housing may have a main body portion in which an opening is formed and a lid portion that covers the opening of the main body portion. Further, the mount portion and the fragile portion may be provided on the lid portion.

In the mounting structure of the motor assembly described above, the fragile portion may be a notch or a slit provided in the wall surface of the second housing.
Further, the second housing may have a protector that is formed so as to project in a direction intersecting the rotation axis of the motor and that receives a collision load at the time of a vehicle collision.
Further, the notch or the slit may be formed so as to extend in a direction intersecting the protruding direction of the protector on the wall surface provided with the mount portion.
Further, the mount portion may be arranged at a position farther from the motor than the protector.

According to the mounting structure of the motor assembly according to one aspect of the present invention, it is possible to suppress the exposure of the high-power portion to the outside even in the event of a collision of an electric vehicle.

It is a perspective view which shows an example of the motor assembly of 1st Embodiment. It is a partially enlarged perspective view of the circuit housing shown in FIG. It is a front view which shows an example of the mounting structure of the motor assembly in 1st Embodiment. It is a top view of FIG. It is a side view which partially enlarged the circuit housing of 2nd Embodiment. It is a partially enlarged perspective view of the circuit housing of 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the embodiment, in order to make the explanation easy to understand, the structures and elements other than the main part of the present invention will be described in a simplified or omitted manner. Further, in the drawings, the same elements are designated by the same reference numerals. It should be noted that the shapes, dimensions, etc. of each element shown in the drawings are schematically shown, and do not indicate the actual shapes, dimensions, etc.

Further, in the drawings, the XYZ coordinate system is shown as a three-dimensional Cartesian coordinate system as appropriate. In the XYZ coordinate system, the Z-axis direction is parallel to the rotation axis AX described later. The X-axis direction is orthogonal to the Z-axis direction and corresponds to the paper depth direction of FIG. The Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction, and corresponds to the vertical direction in FIG.

<First Embodiment>
The motor assembly and its mounting structure according to the first embodiment will be described with reference to FIGS. 1 to 4.
FIG. 1 is a perspective view showing an example of the motor assembly of the first embodiment. FIG. 2 is a partially enlarged perspective view of the circuit housing shown in FIG. FIG. 3 is a front view showing an example of the mounting structure of the motor assembly according to the first embodiment. FIG. 4 is a plan view of FIG.

The motor assembly 1 shown in FIG. 1 includes a motor housing 2 and a circuit housing 3. The motor housing 2 and the circuit housing 3 are both formed by casting, for example.

The motor housing 2 is an example of the first housing, and houses a motor M including a stator in which a coil is wound and a rotor in which a permanent magnet is arranged (see FIGS. 3 and 4). In the drawings, the rotation axis of the motor M is indicated by reference numeral AX, if necessary.

As shown in FIGS. 3 and 4, a speed reducer including a gear for transmitting power from the shaft of the motor M on the load side of the motor M (on the right side in the drawings of FIGS. 3 and 4) in the motor assembly 1. 4 is attached. The speed reducer 4 is fixed to the structural component 5 on the vehicle side at two locations, the upper side and the lower side shown in FIG. The fixed portion of the motor assembly 1 with the structural component 5 on the load side is also referred to as a first fixed portion 6.

On the other hand, in the motor assembly 1, the circuit housing 3 is attached to the motor housing 2 on the opposite load side (left side in the drawings of FIGS. 3 and 4) of the motor M. The circuit housing 3 is an example of the second housing, and houses an inverter circuit (not shown) inside the circuit housing 3. The circuit housing 3 has a box-shaped main body 11 having an opening on one side away from the motor M, and a lid 12 covering the opening of the main body 11.

The inverter circuit housed in the circuit housing 3 converts the DC voltage from the external power supply (not shown) into alternating current and supplies it to the coil of the motor M. For example, the circuit housing 3 houses a high-speed switching element such as an IGBT, a gate board, a capacitor, a discharge resistor, and control components constituting an inverter circuit such as a control board. The high-speed switching element and the gate substrate are examples of high-power parts.

Further, a protector 13 is formed on the main body 11 of the circuit housing 3 so as to project in a direction intersecting the rotation axis AX of the motor M (X direction in the drawing) and has a function of first receiving a collision load at the time of a vehicle collision. It is provided. Although not particularly limited, for example, the motor assembly 1 is attached to the electric vehicle with the protector 13 facing the front side of the electric vehicle.

The lid portion 12 of the circuit housing 3 has a convex portion 14 having a shape bulging in the direction opposite to the load side. Further, on the wall surface 14a of the convex portion 14 of the lid portion 12 facing the upper side in FIG. 3, a protrusion protruding outward in a direction intersecting the protruding direction of the rotation axis AX of the motor M and the protector 13 (Y direction in the drawing). A shaped mount portion 15 is provided. The mount portion 15 is formed with a bolt hole 15a. The mount portion 15 faces the structural component 7 on the vehicle side in the projecting direction (Y direction in the drawing), and for example, by screwing a bolt into the bolt hole 15a of the mount portion 15, the mount portion 15 and the structural component on the vehicle side are screwed. 7 and are fixed. The fixed portion with the structural component 7 via the mount portion 15 on the opposite load side of the motor assembly 1 is also referred to as a second fixed portion 8.

Further, as shown in FIGS. 1 and 2, a notch 16 is formed in the vicinity of the mount portion 15 on the wall surface 14a of the convex portion 14 of the lid portion 12. For example, the notches 16 are notched so as to extend in the Z direction intersecting the projecting direction (X direction) of the protector 13, and are formed in pairs on the wall surface 14a of the convex portion 14 so as to face each other.

The notch 16 is an example of a fragile portion, and when the motor assembly 1 receives a collision load and a load of a predetermined value or more is applied to the lid portion 12, the mount portion 15 is attached to the base portion of the lid portion 12. It has the function of making it easier to break. By breaking the mount portion 15, the mount portion 15 fixed to the structural component 7 can be separated from the lid portion 12 in the event of a vehicle collision.

Further, specifications such as the shape and dimensions of the notch 16 and the position of the notch 16 can be appropriately set according to conditions such as the strength of the lid portion 12 and the set load for breaking the mount portion 15. For example, a notch specification is adopted in which a vehicle collision test is performed with the motor assembly 1 attached to the vehicle, and the breakage of the mount portion 15 can be confirmed in the test.

The motor mounting structure of the first embodiment includes a motor assembly 1 that integrally includes a motor housing 2 and a circuit housing 3, and a speed reducer 4 that receives power from the motor M. The motor assembly 1 has a first fixing portion 6 fixed to a structural component 5 on the vehicle side via a speed reducer 4 on the load side of the motor M, and is attached to the circuit housing 3 on the non-load side of the motor M. It has a second fixing portion 8 that is fixed to the structural component 7 on the vehicle side via the provided mounting portion 15. The wall surface 14a on which the mount portion 15 is provided in the circuit housing 3 is formed with a notch 16 that promotes breakage of the mount portion 15 when a load of a predetermined value or more is applied.

In the normal state (non-collision), the motor assembly 1 is fixed to the

structural parts

5 and 7 on the vehicle side on both the non-load side and the load side, respectively. Therefore, in the motor mounting structure of the first embodiment, the heavy motor assembly 1 can be stably fixed to the electric vehicle.

On the other hand, when the motor assembly 1 receives a collision load due to a vehicle collision accident, the motor assembly 1 is displaced as follows. In the following description, it is assumed that the collision load is input to the protector 13 of the motor assembly 1 from the direction facing the protruding direction of the protector 13.

When a collision load is input to the protector 13, the motor assembly 1 moves the motor M at the position of the protector 13 between the first fixing portion 6 on the load side and the second fixing portion 8 on the unload side. A large load is received from the direction intersecting the rotation axis AX. In this state, the first fixing portion 6 and the second fixing portion 8 supporting the motor assembly 1 on both sides bear the load, respectively, as in the case of applying the eccentric load to the beam fixed at both ends. ..

Here, the wall surface 14a of the lid portion 12 provided with the mount portion 15 in the circuit housing 3 is formed with a notch 16 that promotes breakage of the mount portion 15 when a load of a predetermined value or more is applied. Therefore, when the motor assembly 1 receives a collision load and a load of a predetermined value or more is applied to the lid portion 12, the collision load and the shear stress due to the reaction force from the structural component 7 are concentrated on the notch 16, and the mount portion 15 is subjected to. It breaks at the root of the lid 12. As a result, the mount portion 15 fixed to the structural component 7 is separated from the lid portion 12 in the event of a vehicle collision.

When the mount portion 15 was separated from the lid portion 12 due to the breakage of the mount portion 15, the fixing of the motor assembly 1 on the opposite load side was released, and the motor assembly 1 was fixed by the first fixing portion 6 in the Z-axis direction. It becomes cantilevered. In this state, as in the case of applying an eccentric load to the cantilever, the first fixing portion 6 on the load side supporting the motor assembly 1 bears the load and is more than the protector 13 that receives the collision load. The non-load side is the free end. That is, the load of the lid portion 12 located at a position farther from the motor M than the protector 13 on the non-load side is much smaller than that before the break of the mount portion 15. As a result, the lid portion 12 is less likely to be damaged after the mount portion 15 is broken, so that it is possible to prevent the strong electric portion of the inverter circuit housed in the circuit housing 3 from being exposed to the outside due to the damage of the lid portion 12 in the event of a collision. ..

<Second Embodiment>
5 and 6 are views showing a configuration in the vicinity of the mount portion in the motor mounting structure of the electric vehicle according to the second embodiment. In the following description, the same components as those in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.

In the second embodiment, in the vicinity of the mount portion 15 in the convex portion 14 of the lid portion 12, as an example of the fragile portion, a groove-shaped slit 17 having an arcuate cross section intersects the projecting direction (X direction) of the protector 13. It is formed so as to extend in the Z direction. The portion where the slit 17 is formed on the wall surface 14a of the convex portion 14 has a thinner wall thickness than the portion without the slit 17, and thus functions in the same manner as the notch of the first embodiment. That is, the slit 17 has a function of easily breaking the mount portion 15 at the root portion with the lid portion 12 when the motor assembly 1 receives a collision load and a load of a predetermined value or more is applied to the lid portion 12. .. The specifications such as the shape and dimensions of the slit 17 and the position of the slit 17 depend on the strength of the lid portion 12 and the set load for breaking the mount portion 15, as in the case of the notch of the first embodiment. Can be set as appropriate

As described above, the same effect as that of the first embodiment can be obtained by the configuration of the slit 17 of the second embodiment.

The present invention is not limited to the above embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.

For example, in the above embodiment, the case where the motor assembly 1 receives a collision load from the direction of the protector 13 (for example, the front side of the electric vehicle) has been described. However, even when the motor assembly 1 receives a collision load from the side opposite to the direction of the protector 13 (for example, the rear side of the electric vehicle), the same effect as that of the above embodiment can be obtained.

In the above embodiment, an example in which the mount portion 15 and the fragile portion (notch 16, slit 17) are provided in the lid portion 12 has been described, but the arrangement of the mount portion 15 and the fragile portion is limited to the configuration of the above embodiment. It's not a thing. For example, in the main body 11 of the circuit housing 3, the mount portion 15 and the fragile portion may be arranged at a portion opposite to the forming position of the protector 13 in the X direction.

In addition, the embodiments disclosed this time should be considered to be exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 ... Motor assembly, 2 ... Motor housing, 3 ... Circuit housing, 4 ... Reducer, 5, 7 ... Structural parts, 6 ... First fixing part, 8 ... Second fixing part, 11 ... Main body part, 12 ... lid, 13 ... protector, 14 ... convex, 14a ... wall surface, 15 ... mount, 15a ... bolt hole, 16 ... notch, 17 ... slit, M ... motor

Claims

It is a mounting structure of a motor assembly for an electric vehicle.
A motor assembly having a first housing for accommodating a motor and a second housing attached to the first housing on the counterload side of the motor and accommodating a control component of the motor including a high electric power portion.
A first fixing portion for fixing the motor assembly to a structural component of an electric vehicle on the load side of the motor,
A second fixing portion for fixing the second housing to the structural component on the counterload side of the motor is provided.
The second housing has a mounting portion for fixing the motor assembly to the structural component, and the second housing is broken when the second housing receives a load equal to or higher than a predetermined value at the time of a vehicle collision, and the second housing is separated from the second housing. A mounting structure of a motor assembly having a fragile part for detaching the mount part.
The second housing has a main body portion in which an opening is formed and a lid portion that covers the opening of the main body portion.
The mounting structure for a motor assembly according to claim 1, wherein the mount portion and the fragile portion are provided on the lid portion.
The mounting structure of the motor assembly according to claim 1 or 2, wherein the fragile portion is a notch or a slit provided on the wall surface of the second housing.
The mounting structure for a motor assembly according to claim 3, wherein the second housing is formed so as to project in a direction intersecting the rotation axis of the motor and has a protector that receives a collision load at the time of a vehicle collision.
The mounting structure for a motor assembly according to claim 4, wherein the notch or the slit is formed so as to extend in a direction intersecting the protruding direction of the protector on the wall surface provided with the mount portion.
The mounting structure for a motor assembly according to claim 4 or 5, wherein the mount portion is arranged at a position farther from the motor than the protector.