JP2021154835A - Deformation inhibition structure of vehicle component - Google Patents

Abstract

To provide a deformation inhibition structure that can inhibit deformation of a vehicle component disposed behind an electric power conversion device even if the electric power conversion device etc. disposed at an engine room is moved backward during a vehicle collision.SOLUTION: A deformation inhibition structure 1 of a vehicle component 21 of the invention includes: a motor case 12; an electric power conversion device 10 disposed at the upper side U of the motor case 12 and integrated with the motor case 12; a slider 15 disposed behind a case rear surface of the motor case 12 and a device rear surface 10a of the electric power conversion device 10 and provided with a first inclination surface 15a inclining to the vehicle front Fr toward the upper side U; and a vehicle component 21 which is attached to a dash lower 20 spaced apart from the slider 15 behind the slider 15.SELECTED DRAWING: Figure 4

Description

The present invention relates to a deformation suppressing structure for vehicle parts.

A vehicle traveling by an electric motor is provided with a power conversion device that converts DC power output from a high-voltage power supply into AC and supplies the DC power to the motor. The power conversion device is often installed in an engine room provided in front of the vehicle. When such a vehicle collides from the front, the impact causes the power conversion device to move backward. Then, the vehicle parts arranged behind the power converter may be deformed.

Conventionally, there is a technique in which a connector arranged on the upper surface of a power conversion device is provided with an extending portion inclined so as to be lower toward the rear. In this conventional technique, when a vehicle collides and the power conversion device retracts, the extension portion moves the wire harness arranged behind the power conversion device upward to suppress the deformation of the wire harness. (See Patent Document 1).

Japanese Patent Application No. 2015-140552

According to the above-mentioned prior art, if it is a lightweight object such as a wire harness or a low-rigidity vehicle part, the impact of a collision can be absorbed by a connector arranged on the upper surface of the power conversion device.
However, in the case of heavy objects and high-rigidity vehicle parts, the vehicle parts cannot be moved by the extension portion provided on the connector arranged on the upper surface of the power converter, and the extension portion and the connector collide with each other. It cannot withstand the impact and is damaged.

The present invention provides a deformation suppression structure capable of suppressing deformation of vehicle parts arranged behind the power conversion device even when the power conversion device or the like arranged in the engine room retracts at the time of a vehicle collision. With the goal.

(1) The present invention includes a motor case, a power conversion device arranged above the motor case and integrated with the motor case, a case rear surface of the motor case, and a device of the power conversion device. A vehicle component including a slider arranged behind the rear surface and provided with a first slope that is inclined toward the front of the vehicle toward the upper side, and a vehicle component attached to the dash lower behind the slider so as to be separated from the slider. Provides a deformation suppressing structure of.

According to the invention of (1), at the time of a vehicle collision, the heavy motor case and the power conversion device are integrally moved rearward due to the impact of the collision. At that time, the slider also moves rearward, and the first slope of the slider comes into contact with the vehicle parts located behind the slider from the lower part. As the slider moves further backward, the slider pushes the vehicle part while wrapping around to the lower side of the vehicle part, so that the vehicle part moves upward while rotating.
Since the vehicle parts move upward, the dash lower is prevented from being deformed due to the backward movement of the vehicle parts, and the occupant can be protected. Furthermore, the rearward movement of the brake pedal due to the deformation of the dash lower is also prevented.
Further, since the vehicle parts rotate when the slider collides, the impact itself received by the slider from the vehicle parts is also mitigated.

(2) In the deformation suppressing structure of the vehicle component according to (1), the rear surface of the case and the rear surface of the device of the power conversion device are adjacent to each other, and a second slope inclined toward the front of the vehicle is provided upward. The first slope is preferably arranged behind the second slope.

According to the invention of (2), the impact received from the vehicle parts is transmitted from the first slope to the second slope of the slider. At this time, since the impact is received on the second slope which is a flat surface, the impact is dispersed and the impact per unit area is further reduced.

(3) In the deformation suppressing structure of the vehicle component according to (1) or (2), the power conversion device includes a power control unit and a water jacket, and a slider is a water jacket on the rear surface of the device. It is preferably attached to the rear surface.

The cover of the power control unit is generally made of die-cast aluminum or resin, and has low strength. Therefore, if the slider is attached, it may not be able to receive the collision load and may be broken. Further, when the slider is attached to the motor case, it is structurally not easy to assemble.
However, according to the invention of (3), the slider is attached to the rear surface of the water jacket. Since the water jacket is generally rigid and has high strength, it can be impacted at the time of collision. In addition, it is structurally easy to attach the slider.

(4) In the deformation suppressing structure of the vehicle component according to any one of (1) to (3), the vehicle component is preferably a brake-related component.

When the vehicle parts are, for example, brake-related parts, they are arranged on the front side of the brake pedal with the dash lower in between. Here, from the viewpoint of occupant protection, it is necessary to suppress the amount of dash lower invading the brake pedal to a specified value or less at the time of a front collision.
However, if there is a motor case or a power conversion device in front of the vehicle parts, the vehicle parts are pushed backward by the motor case or the power conversion device at the time of a collision when the slider is not provided as in the present application. Then, the vehicle parts and the dash lower are deformed and the brake pedal is pushed backward, and the amount of the dash lower entering the brake pedal cannot be reduced to the specified value or less.
Therefore, in the structure without the slider as in the present application, the motor case and the power conversion device cannot be provided in front of the vehicle parts. In this case, since it is necessary to arrange the vehicle parts and the power conversion device so that they do not overlap each other in the front-rear direction, a space in the width direction of the vehicle is required to arrange the vehicle parts and the power conversion device so that they do not overlap each other in the front-rear direction. It becomes.

However, in the embodiment, a slider is provided behind the motor case and the power conversion device. Then, even if the power conversion device moves backward at the time of a vehicle collision, the vehicle parts are moved upward by the slider, so that the vehicle parts and the dash lower are not deformed.
Therefore, even if the motor case and the power conversion device are arranged in front of the vehicle parts, the amount of the dash lower entering the brake pedal at the time of a front collision can be suppressed to a specified value or less. Therefore, it is possible to arrange the motor case and the power conversion device in front of the vehicle parts, it is not necessary to take up space in the width direction, the dimensions in the width direction of the vehicle can be reduced, and the packageability of the engine room is improved. can do.

According to the present invention, there is provided a deformation suppression structure capable of suppressing deformation of vehicle parts arranged behind the power conversion device even when the power conversion device or the like arranged in the engine room retracts at the time of a vehicle collision. can do.

It is a top view of the engine room including the deformation suppression structure of a vehicle part which concerns on one Embodiment of this invention. It is a partial front view of the engine room including the deformation suppressing structure of a vehicle part which concerns on one Embodiment of this invention. It is a perspective view of the power conversion apparatus and a slider which concerns on one Embodiment of this invention. It is a partial front view of the engine room including the deformation suppressing structure of a vehicle part which concerns on one Embodiment of this invention, and shows the time of a collision.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a top view of the engine room 100 including the deformation suppressing structure 1 of vehicle parts according to an embodiment of the present invention, and the upper side in the drawing is the front Fr of the vehicle. FIG. 2 is a partial front view of the engine room 100 including the deformation suppressing structure 1 of the vehicle parts according to the embodiment of the present invention, and the left side in the drawing is the front Fr of the vehicle.
In the figure, the U direction is upward, the D direction is downward, the Fr direction is the front of the vehicle, the Rr direction is the rear of the vehicle, the R direction is the right direction (right direction of the vehicle width) as seen from the driver's seat of the vehicle, and the L direction is the vehicle. It means the left direction (vehicle width left direction) as seen from the driver's seat.

The engine room 100 is a space provided in the bonnet of the front Fr of the vehicle, and has a dash lower 20 erected from a floor panel (not shown) constituting the floor surface and a dash upper connected to the upper end of the dash lower 20. It is separated from the passenger compartment (not shown) on which the occupants board by (not shown).

The engine room 100 is provided with an engine 11, a motor case 12 arranged adjacent to the engine 11, a power conversion device 10 arranged on the motor case 12, and behind the motor case 12 and the power conversion device 10. A BOS (brake operating simulator) 21 which is a vehicle component attached to the dash lower 20 is provided behind the slider 15.

The power conversion device 10 includes a water jacket 13 and a PCU 14 (power control unit) 14.

The PCU 14 is formed by an inverter for driving a motor, a boost converter for controlling a voltage, a DC converter for stepping down a high voltage, and a case for storing them. The PCU 14 converts the DC power supplied from the battery (not shown) into AC power and supplies it to the drive motor (located in the motor case 12). In the embodiment, the cover of the PCU 14 is made of die-cast aluminum or resin.

The drive motor (not shown) is covered by a motor case 12. The drive motor receives power from the PCU 14 and generates drive torque.

The water jacket 13 is a flow path for cooling water and is arranged below the PCU 14. The water jacket 13 is circulateably filled with cooling water for cooling the PCU 14. The cooling water filled in the water jacket 13 is circulated between the PCU 14 and the radiator 16 by a water pump (not shown).

The case rear surface 12a of the motor case 12 and at least a part of the device rear surface 10a of the power conversion device 10 are integrated. That is, the rear surface 12a of the case and a part of the rear surface 10a of the device are substantially the same plane, and form a second slope 2 inclined so that the upper U is the front Fr of the vehicle and the lower D is the rear Rr of the vehicle. ..
At least a part of the device rear surface 10a forming the second slope 2 includes the rear surface of the water jacket 13. The rear surface of the water jacket 13 and the case rear surface 12a of the motor case 12 are integrated to form the second slope 2.

The BOS 21 is a pedal reaction force simulator of a brake-by-wire system for obtaining a reaction force against a driver's depression of a brake pedal (not shown). Since the BOS 21 is operated by operating the brake pedal, it is fixed to the front surface of the dash lower 20 so as to face the brake pedal with the dash lower 20 in between. Further, the BOS 21 is arranged directly behind the vehicle rear Rr of the power conversion device 10 and the slider 15.

By the way, when a vehicle collides and a collision load is applied from the front Fr of the vehicle, the engine 11, the motor case 12 including the drive motor inside, and the power conversion device 10 are integrally moved to the rear.
Then, it is conceivable that the BOS 21 fixed to the front surface of the dash lower 20 is pressed by the motor case 12 and the power conversion device 10, the dash lower 20 is deformed, and the brake pedal is pushed backward.

However, in the embodiment, the slider 15 is arranged behind the motor case 12 and the power conversion device 10. As shown in FIG. 2, the slider 15 is a substantially triangular shape that becomes thinner toward the upper side U when viewed from the side. The first slope 15a, which is the rear surface of the slider 15, is arranged behind the second slope 2, and is inclined so that the upper U is the front Fr of the vehicle and the lower D is the rear Rr of the vehicle. ing. The upper portion of the first slope 15a of the slider 15 is further inclined toward the front Fr of the vehicle than the first slope 15a, and wraps around the upper surface of the PCU 14.

FIG. 3 is a perspective view of the power conversion device 10 and the slider 15. The slider 15 is attached to the rear surface of the water jacket 13 by fixing the left and right ends to the water jacket 13 with screws 13a.
The cover of the PCU 14 is generally made of die-cast aluminum or resin and has low strength. Therefore, when the slider 15 is attached, the cover cannot receive the collision load and may be broken. Further, when the slider 15 is attached to the motor case 12, it is structurally not easy to assemble.
However, the slider 15 is attached to the rear surface of the water jacket 13. Since the water jacket 13 is generally rigid and has high strength, it can receive an impact at the time of collision. Moreover, it is structurally easy to attach the slider 15.

In FIG. 3, the internal structure of the slider 15 is shown by a dotted line. The material of the slider 15 can be either metal or resin. In the embodiment, the slider 15 is made of metal and is die-cast, and a plurality of cavities 15b are provided inside. Since the cavity 15b is provided in this way, the weight of the slider 15 as a whole can be reduced, and the material can be further saved, so that the cost can be reduced.

Further, the portion other than the cavity 15b is a rib 15c that connects the front surface and the first slope 15a inside the slider 15. A plurality of ribs 15c extend in the vertical direction (UD) and the horizontal direction (RL), respectively. At the portion where the water jacket 13 and the slider 15 come into contact with each other, some of the cross-shaped portions where the ribs 15c extending in the vertical direction (UD) and the ribs 15c extending in the left-right (RL) direction intersect are located.
As a result, when the slider 15 collides with the BOS 21 as described later, the collision load is transmitted to the rigid water jacket 13.

According to the deformation suppressing structure 1 of the vehicle parts according to the present embodiment having the above configuration, the following effects are exhibited. FIG. 4 is a partial front view of the engine room 100 including the deformation suppressing structure 1 of the vehicle parts, similar to FIG. 2, and shows a state at the time of a vehicle collision.

At the time of a vehicle collision, due to the impact of the collision, the heavy motor case 12 and the power conversion device 10 are integrally moved to the rear as shown by the arrows in the figure.
At that time, the slider 15 also moves rearward as shown by an arrow in the drawing, and the first slope 15a of the slider 15 comes into contact with the BOS 21 located behind the slider 15 from the lower portion protruding rearward. When the slider 15 moves further backward, the slider 15 pushes the BOS 21 while wrapping around to the lower side of the BOS 21, so that the BOS 21 moves upward while rotating in the direction indicated by the arrow in the figure.
Since the BOS 21 moves upward, the amount of backward movement decreases. Therefore, the deformation of the dash lower 20 by the BOS 21 is prevented, and the occupant can be protected. Further, the rearward movement of the brake pedal due to the deformation of the dash lower 20 is prevented.

Further, since the BOS 21 rotates when the slider 15 collides, the impact itself received by the slider 15 from the BOS 21 is also alleviated. Further, the relaxed impact received from the BOS 21 is transmitted from the first slope 15a of the slider 15 to the second slope 2 through the rib 15c. At this time, since the impact is received on the second slope 2 which is a flat surface, the impact is dispersed and the impact per unit area is further reduced.

The power conversion device 10 includes a PCU 14 and a water jacket 13, and a slider 15 is attached to the rear surface of the water jacket 13.
The cover of the PCU 14 is generally made of die-cast aluminum or resin and has low strength. Therefore, when the slider 15 is attached, the cover cannot receive the collision load and may be broken. Further, when the slider 15 is attached to the motor case 12, it is structurally not easy to assemble.
However, the slider 15 is attached to the rear surface of the water jacket 13. Since the water jacket 13 is generally rigid and has high strength, it can receive an impact at the time of collision. Moreover, it is structurally easy to attach the slider 15.

Since the BOS 21 is a brake-related component, it is arranged on the front side of the brake pedal with the dash lower 20 in between. Here, from the viewpoint of occupant protection, it is necessary to suppress the amount of the dash lower 20 invading the brake pedal to a specified value or less at the time of a front collision.
However, if there is a motor case 12 or a power conversion device 10 in front of the BOS 21, the BOS 21 is pushed backward by the motor case 12 or the power conversion device 10 at the time of a collision when the slider 15 is not provided as in the present application. .. When the BOS 21 is pushed backward at the time of a collision, the dash lower 20 is deformed and the brake pedal is pushed backward. Then, the amount of the dash lower 20 entering the brake pedal at the time of a front collision cannot be reduced to the specified value or less.
Therefore, if the slider 15 is not provided, the motor case 12 and the power conversion device 10 cannot be provided in front of the BOS 21. In this case, since the BOS 21 and the PCU 14 need to be arranged so as not to overlap each other in the front-rear direction, a space in the width direction of the vehicle is required.

However, in the embodiment, the slider 15 is provided behind the motor case 12 and the power conversion device 10. Then, even if the PCU 14 moves backward at the time of a vehicle collision, the slider 15 moves the BOS 21 upward, so that the BOS 21 does not deform the dash lower 20.
Therefore, even if the motor case 12 and the power conversion device 10 are arranged in front of the BOS 21, the amount of the dash lower 20 entering the brake pedal at the time of a front collision can be suppressed to a specified value or less.
Therefore, the motor case 12 and the power conversion device 10 can be arranged in front of the BOS 21, it is not necessary to take up space in the width direction, the dimension in the width direction of the vehicle can be reduced, and the packageability of the engine room is improved. can do.

The present invention is not limited to the above embodiment, and modifications and improvements within the range in which the object of the present invention can be achieved are included in the present invention.
For example, regardless of whether the suspension specifications are slat specifications or double wishbone specifications, it is not necessary to remake the dash lower, and damage can be prevented by flipping up the BOS 21.

1 ... Deformation suppression structure 1A ... Cooling structure 2 ... Second slope 10 ... Power conversion device 10a ... Device rear surface 11 ... Engine 12 ... Motor case 12a ... Case rear surface 13 ... Water jacket 14 ... PCU
15 ... Slider 15a ... First slope 15b ... Cavity 15c ... Rib 16 ... Radiator 20 ... Dash lower 21 ... BOS ...
100 ... Engine room

Claims (4)

With the motor case
A power conversion device that is arranged above the motor case and is integrated with the motor case.
A slider arranged behind the rear surface of the case of the motor case and the rear surface of the device of the power conversion device, and provided with a first slope inclined toward the front of the vehicle toward the upper side.
Vehicle parts mounted on the dash lower behind the slider, away from the slider,
Deformation suppression structure for vehicle parts. The rear surface of the case and the rear surface of the device of the power conversion device are adjacent to each other, and a second slope inclined toward the front of the vehicle is provided toward the upper side, and the first slope is arranged behind the second slope. ,
The deformation suppressing structure for vehicle parts according to claim 1. The power conversion device includes a power control unit and a water jacket, and the slider is attached to the rear surface of the water jacket on the rear surface of the device.
The deformation suppressing structure for vehicle parts according to claim 1 or 2. The vehicle parts must be brake-related parts.
The deformation suppressing structure for vehicle parts according to any one of claims 1 to 3.

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