JP2020157987A - Vehicle body front part structure - Google Patents

Abstract

To provide a vehicle body front part structure which can protect an auxiliary component of a motor and absorb collision energy preferably during a frontal collision of a vehicle.SOLUTION: A vehicle body front part structure 1 includes: a sub frame 5 extending in an anteroposterior direction; a motor 6 supported by the sub frame 5; an auxiliary component 7 provided behind the motor 6; a front cross member 11 to which a rear end part of the sub frame 5 is fixed; and a dash panel 10 which partitions an internal space of a vehicle body into front and rear spaces between the auxiliary component 7 and the front cross member 11. A first easily deformable part A is formed between a support part of the motor 6 and a rear end part in the sub frame 5. A second easily deformable part B is formed at the dash panel 10. A protector 13 supported by the sub frame 5 is disposed between the auxiliary component 7 and the second easily deformable part B.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle body front structure.

According to Patent Document 1, when a vehicle collides forward, the engine that retracts due to the front impact load is brought into contact with the dash cover attached to the dash panel, and the dash cover is deformed to absorb the front impact load (collision energy). The structure to be used is described.

Jikkenhei 5-1669 Gazette

In recent years, from the viewpoint of environmental protection and the like, vehicles such as electric vehicles in which the engine is replaced with a motor (electric motor) are being developed. In such vehicles, auxiliary parts are provided on the rear side of the motor. In addition, since there is a need for miniaturization of such vehicles, the distance between the auxiliary parts and the dash panel is set small. Therefore, when the vehicle collides with the front, the auxiliary parts may collide with the dash panel and be damaged.

The present invention has been devised in view of the above matters, and provides a vehicle body front structure capable of protecting auxiliary parts of a motor and suitably absorbing collision energy at the time of a front collision of a vehicle. The task is to do.

In order to solve the above-mentioned problems, the vehicle body front structure of the present invention includes a subframe extending in the front-rear direction, a motor supported by the subframe, auxiliary parts provided on the rear side of the motor, and the sub. A fixing portion to which the rear end portion of the frame is fixed and a dash panel for partitioning the internal space of the vehicle body in the front-rear direction between the auxiliary equipment component and the fixing portion are provided, and the motor is supported in the subframe. A first easily deformable portion is formed between the portion and the rear end portion, and a second easily deformable portion is formed on the dash panel, and the auxiliary machine component and the second easily deformable portion are formed. A protector supported by at least one of the subframe and the motor is arranged between the easily deformable portion of the motor.

According to the present invention, when the vehicle hits the front, the auxiliary parts can be protected and the collision energy can be suitably absorbed.

It is a side view which shows the vehicle body front part structure which concerns on embodiment of this invention. It is a perspective view which shows the vehicle body front part structure which concerns on embodiment of this invention. It is a top view which shows typically the front part structure of the vehicle body which concerns on embodiment of this invention. It is a schematic side view for demonstrating protection of auxiliary machine parts by the body front structure which concerns on embodiment of this invention. It is a schematic side view for demonstrating protection of auxiliary machine parts by the body front structure which concerns on embodiment of this invention. It is a schematic side view for demonstrating protection of auxiliary machine parts by the body front structure which concerns on embodiment of this invention. It is a schematic side view for demonstrating protection of auxiliary machine parts by the body front structure which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. The same components are designated by the same reference numerals, and duplicate description will be omitted. Terms that indicate directions such as up and down, front and back, and left and right (vehicle width direction) are based on the occupant (driver) of the vehicle.

As shown in FIG. 1, the vehicle body front structure 1 according to the embodiment of the present invention is a structure of an electric vehicle using a motor as a drive source, and includes a bumper 2, a pair of left and right front side frames 3, and 3. It includes a pair of left and right upper members 4, 4. Here, FIG. 1 shows the vehicle body front structure 1 with a sagittal plane (a plane including the front-rear direction and the up-down direction and orthogonal to the left-right direction) passing through the left front-rear side portion 23 and the mount 9 described later as a cross section. It is a side view seen from the left. That is, FIG. 1 shows the right side of the pair of left and right front side frames 3, 3 and upper members 4, 4.

<Bumpa>
The bumper (bumper beam) 2 is a metal or resin structural member (skeleton member) extending in the vehicle width direction at the front end of the vehicle (automobile).

<Front side frame>
The front side frame 3 is a structural member made of metal or resin that extends rearward from the vicinity of the end portion of the bumper 2 in the vehicle width direction. The front side frame 3 (a portion in front of the dash panel described later) exhibits a substantially rectangular closed cross-sectional shape in a front view (a plane including the vertical direction and the horizontal direction). The front side frame 3 is formed by, for example, joining the inner panel forming the inside of the front side frame 3 in the vehicle width direction and the outer panel forming the outside of the front side frame 3 in the vehicle width direction by welding or the like. It is formed. The portion of the front side frame 3 after the dash panel 10 described later has a substantially U-shape with an opening on the upper side, and is joined to the lower surface of the floor panel constituting the floor surface of the passenger compartment by welding or the like. ing.

<Upper member>
The upper member 4 is a metal or resin structural member extending rearward and upward from the end portion of the bumper 2 in the vehicle width direction (outside the front side frame 3 in the vehicle width direction). The upper member 4 exhibits a substantially rectangular closed cross-sectional shape when viewed from the front. The upper member 4 is formed by, for example, joining the inner panel forming the inside of the upper member 4 in the vehicle width direction and the outer panel forming the outside of the upper member 4 in the vehicle width direction by welding or the like. The front end portion of the upper member 4 is connected to the front side frame 3 via a connecting member (not shown), and the rear end portion of the upper member 4 is connected to the middle portion in the height direction (near the belt line) of the front pillar. It is joined by welding or the like.

Further, as shown in FIGS. 1 and 2, the vehicle body front structure 1 includes a subframe 5, a motor 6, auxiliary parts 7, mounts 8, mounts 9, 9 and dash panels 10 on the left and right sides. It includes a pair of front cross members 11 and 11 and a dash cross member 12. FIG. 2 is a perspective view of the vehicle body front structure 1 viewed from the upper left with the sagittal plane passing through the left front and rear side portions 23 and the mount 9 described later as a cross section. In FIG. 2, the bumper 2, the pair of left and right front side frames 3, the pair of left and right upper members 4, the dash panel 10, the pair of left and right front cross members 11, and the dash cross member 12 are omitted.

<Subframe>
The subframe 5 is a structural member made of metal or resin for supporting the motor 6. The subframe 5 has a pair of left and right upper and lower side portions 21 extending downward from the front side frame, horizontal side portions 22 erected between the lower ends of the upper and lower side portions 21 and 21, and rearward from the upper and lower side portions 21. A pair of left and right front and rear side portions 23, 23, which are extended to the left and right sides, are provided.

The front and rear side portions 23 have a substantially rectangular closed cross-sectional shape when viewed from the front. The front-rear side portion 23 is formed by, for example, joining the lower panel constituting the lower portion of the front-rear side portion 23 and the upper panel constituting the upper portion of the front-rear side portion 23 by welding or the like. The rear end portion of the front and rear side portions 23 is fixed to the front cross member 11 as a fixing portion by fastening bolts or the like.

<Motor>
The motor (electric motor) 6 is a power source for the vehicle, and is supported and mounted on the subframe 5 via the mounts 8 and 9, 9. The motor 6 is driven by electric power from a storage battery (not shown) to rotate the driving wheels of the vehicle.

<Auxiliary parts>
The auxiliary machine component 7 is an auxiliary machine (so-called high voltage component) of the motor 6 driven by electric power from the storage battery, and is arranged behind the motor 6. The auxiliary machine component 7 is fixed to the motor 6 and / or the mount 9 by fastening bolts or the like. Auxiliary parts 7 include a charger (CHG) for charging a storage battery (battery, not shown) for supplying electric power to the motor 6 by electric power from an AC power source such as a household outlet, and a non-contact type. Rectifier, compressor (E-COMP) that is driven by electric power from the storage battery and compresses the refrigerant for cooling the motor 6, heater (E-HTR) that is driven by electric power from the storage battery and heats the motor 6. Can be mentioned. In addition, the auxiliary component 7 includes an inverter that converts the current from the storage battery into AC (three-phase AC) and the current to the storage battery into DC, and the current from the storage battery (or to the storage battery). Examples thereof include a PCU (Power Control Unit) having a converter or the like for adjusting (reducing or increasing) a voltage, an ECU (Electrical Control Unit) for controlling electrical components of a vehicle including a motor 6 and auxiliary parts, and the like.

<Mount>
The mount 8 is a member that supports the front end portion of the motor 6 and the intermediate portion in the vehicle width direction with respect to the lateral side portion 22 of the subframe 5. The mount 9 is a member that supports the rear end portion of the motor 6 and the end portion in the vehicle width direction with respect to the front and rear side portions 23 of the subframe 5. The mount 9 also supports the accessory component 7.

The mount 9 includes a subframe side member 9a fixed to the upper wall portion of the front and rear side portions 23 by fastening bolts or the like, and a shaft portion 9b protruding rearward from the subframe side member 9a. Further, the mount 9 includes a motor side member 9c fixed to the motor 6 and the auxiliary machine component 7 by fastening bolts or the like, and a bush 9d held by the motor side member 9c. The mount 9 connects the motor 6 and the subframe 5 by inserting the shaft portion 9b through the bush 9d. The vibration of the motor 6 is damped by the bush 9d of the mount 9 when transmitted to the subframe 5 (front and rear side portions 23). The lower portion of the motor side member 9c comes into contact with the front cross member 11 when the front impact load is input to the subframe 5 and the first easily deformed portion A is crushed or bent and deformed. A protector 13 is attached to the upper part of the motor side member 9c.

<Dash panel>
As shown in FIG. 1, the dash panel 10 is a metal plate-shaped member that divides the internal section of the vehicle body back and forth. The dash panel 10 has a main body wall portion 10a extending in the vehicle width direction and the vertical direction, an inclined wall portion 10b extending diagonally downward and rearward from the lower end portion of the main body wall portion 10a, and a lower end portion of the inclined wall portion 10b. A lower wall portion 10c extending rearward from the vehicle is integrally provided. Of the internal space of the vehicle body, the front of the main body wall portion 10a and the inclined wall portion 10b constitutes a power chamber in which the motor 6 and the like are housed, and the rear of the main body wall portion 10a and the inclined wall portion 10b is a vehicle on which occupants board. Make up the room. The rear end portion of the lower wall portion 10c is joined to the front end portion of the floor panel erected between the pair of left and right side sills by welding or the like. The side sill is a metal structural member extending in the front-rear direction at the end portion and the lower end portion in the vehicle width direction of the vehicle interior. The floor panel is a metal member that constitutes the floor surface of the vehicle interior.

<Front cross member>
The front cross member 11 is a metal structural member that is erected between the front side frame 3 and the side sill and has a substantially U-shape that extends in the vehicle width direction and has an opening on the upper side. The front cross member 11 is attached to the front surface of the lower end portion of the inclined wall portion 10b and the lower surface of the lower wall portion 10c in the dash panel 10, and is substantially laterally viewed in cooperation with the inclined wall portion 10b and the lower wall portion 10c. It constitutes a rectangular closed cross section. The front cross member 11 includes a lower wall portion 11a, a front wall portion 11b extending upward from the front end portion of the lower wall portion 11a, and a rear wall portion extending upward from the rear end portion of the lower wall portion 11a. 11c and 11c are integrally provided. Further, the front cross member 11 integrally includes a flange portion 11d extending upward from the upper end portion of the front wall portion 11b and a flange portion 11e extending rearward from the upper end portion of the rear wall portion 11c. .. The flange portion 11d is joined to the front surface of the inclined wall portion 10b by welding or the like, and the flange portion 11e is joined to the lower surface of the lower wall portion 10c by welding or the like.

<Dash cross member>
The dash cross member 12 is a metal structural member that is erected between a pair of left and right side sills and has a substantially U-shape that extends in the vehicle width direction and has an opening on the front side. The dash cross member 12 is attached to the rear surface of the main body wall portion 10a and the inclined wall portion 10b of the dash panel 10, and cooperates with the main body wall portion 10a to form a substantially rectangular closed cross section in a side view. The dash cross member 12 includes a rear wall portion 12a, a lower wall portion 12b extending forward from the lower end portion of the rear wall portion 12a, and an upper wall portion 12c extending forward from the upper end portion of the rear wall portion 12a. And, in one piece. Further, the dash cross member 12 integrally includes a flange portion 12d extending downward from the front end portion of the lower wall portion 12b and a flange portion 12e extending upward from the front end portion of the upper wall portion 12c. .. The flange portions 12d and 12e are joined to the rear surface of the main body wall portion 10a by welding or the like.

<Protector>
The vehicle body front structure 1 includes a protector 13. The protector 13 is supported by a subframe 5 (a pair of left and right front and rear side portions 23) via a pair of left and right mounts 9 and 9, and the upper part of the auxiliary machine component 7 and the second easily deformed dash panel 10 described later. It is provided between the part B and the part B. The protector 13 is a metal member for protecting the auxiliary machine component 7. The protector 13 is erected between the upper portions of the pair of left and right mounts 9 and 9, and extends forward from the main body wall portion 13a extending in the vertical direction and the vehicle width direction and the lower end portion of the main body wall portion 13a. The flange portion 13b and the flange portion 13c extending forward from the upper end portion of the main body wall portion 13a are integrally provided. The main body wall portion 13a is arranged between the upper parts of the mounts 9 and 9 in the front view, is higher than the lower part of the mounts 9 and 9 (the part that abuts the front cross member 11) in the side view, and is the main body wall. The upper portion of the portion 13a is arranged so as to have substantially the same height as the second easily deformable portion B described later. Both ends of the flange portions 13b and 13c in the vehicle width direction are fixed to the rear surface of the motor side member 9c of the mount 9 by bolt fastening, respectively.
That is, the protector 13 cooperates with the bolt and the motor side member 9c of the mount 9 to form a substantially rectangular closed cross section in a side view. The protector 13 has high rigidity as compared with the second easily deformable portion B of the dash panel 10 described later.

The protector 13 may be directly or indirectly supported by at least one of the subframe 5 (a pair of left and right front and rear side portions 23) and the motor 6. For example, the protector 13 may be configured to be directly supported on the rear portion of the motor 6 by fastening bolts or the like. In the present embodiment, the protector 13 is supported by the subframe 5 via the mount 9, and is also supported by the motor 6 via the mount 9.

In the present embodiment, the protector 13 is formed by fixing the members constituting both ends in the vehicle width direction of the protector 13 and the members constituting the intermediate portion in the vehicle width direction of the protector 13 to each other by fastening bolts or the like. Has been done. The members constituting both ends in the vehicle width direction are formed by casting and have higher rigidity than the members constituting the intermediate portion in the vehicle width direction. The members constituting the middle portion in the vehicle width direction are formed thinner than the members constituting both ends in the vehicle width direction, and the weight is reduced. The protector 13 is not limited to the configuration in which the three members are combined as described above, and may be integrally formed. Further, the protector 13 may be a resin member.

≪First easy deformation part≫
In the front and rear side portions 23 of the subframe 5, the first easily deformable portion A is formed between the mounting portion of the mount 9 (subframe side member 9a) and the rear end portion (mounting portion of the front cross member 11). Has been done. The first easily deformable portion A is a portion that is relatively easily deformed (crushed, bent and deformed, etc.) by the front impact load, and in the present embodiment, when the front impact load is input to the bumper 2, priority is given. It is a part that bends and deforms. The first easily deformable portion A has a first bent portion A1 and a second bent portion A2 in this order from the front.

The first bent portion A1 is a portion that is bent and deformed so as to be convex upward by being formed so that the lower wall portion is relatively fragile with respect to the upper wall portion. The first bent portion A1 extends an upwardly recessed recess, a ridge line, etc. in the vehicle width direction on the lower wall portion of the front-rear side portion 23, and / or a reinforcing member on the upper wall portion of the front-rear side portion 23. It can be formed by providing.

The second bent portion A2 is a portion that is bent and deformed so as to be convex downward by being formed so that the upper wall portion is relatively fragile with respect to the lower wall portion. The second bent portion A2 extends downwardly recessed recesses, ridges, etc. in the vehicle width direction on the upper wall portion of the front and rear side portions 23, and / or a reinforcing member on the lower wall portion of the front and rear side portions 23. It can be formed by providing.

≪Second easy deformation part≫
In the dash panel 10, a second easily deformable portion B is formed between the attachment portion of the front cross member 11 and the attachment portion of the dash cross member 12 on the inclined wall portion 10b. The second easily deformable portion B is not reinforced by the cross members 11 and 12, and the dash panel 10 is thinned, so that the second easily deformable portion B is a portion that is relatively easily deformed, and the bumper 2 has a front impact load. This is a portion that deforms (for example, bends and deforms) when the main body wall portion 13a of the protector 13 abuts when input is made.

<Protective structure for auxiliary parts>
As shown in FIG. 3, a pair of left and right mounts 9 and 9 are provided on the side of the auxiliary machine component 7 in the vehicle width direction. Therefore, the pair of left and right mounts 9 and 9 can protect the auxiliary parts 7 from collision objects in the event of a side collision of the vehicle.

Further, the protector 13 is erected on a pair of left and right mounts 9 and 9, and is arranged between the upper portion of the auxiliary machine component 7 and the second easily deformable portion B of the dash panel 10. In the space surrounded by the motor 6 and the protector 13 in a plan view, in addition to the auxiliary parts 7, a harness for supplying electric power to the auxiliary parts 7 and a refrigerant (for example, water, etc.) are added to the auxiliary parts 7. The piping, etc. for supplying electricity is housed. The rear surface of the mount 9 (motor side member 9c) is located behind the auxiliary machine component 7.

When a front impact load is input to the bumper 2 (see FIG. 1), the front side frames 3 and 3 are bent and deformed to absorb the front impact load. Subsequently, as shown in FIGS. 4A and 4B, the first easily deformable portion A in the subframe 5 (front and rear side portions 23) is flexed and deformed so as to exhibit a Z-shape (see FIG. 4D) in a side view. As a result, the mount 9, the motor 6 and the auxiliary component 7 supported by the mount 9, and the protector 13 are retracted (FIG. 4A → FIG. 4B).

Subsequently, as shown in FIG. 4C, the protector 13 (the upper part of the main body wall portion 13a) becomes the second easily deformable portion B of the dash panel 10 while the first easily deformable portion A continues to bend and deform. It abuts and deforms the second easily deformable portion B. Subsequently, as shown in FIG. 4D, the rear surface of the mount 9 (the portion of the motor side member 9c where the bush 9d is provided) comes into contact with the front cross member 11 (front wall portion 11b), and the motor 6 and auxiliary parts The retreat of 7 is regulated.
As described above, the vehicle body front structure 1 absorbs the front collision load (collision energy) by the deformation of the first easily deformable portion A and the second easily deformable portion B, and protects the auxiliary machine component 7 by the protector 13. To do.

The vehicle body front structure 1 according to the embodiment of the present invention includes a subframe 5 extending in the front-rear direction, a motor 6 supported by the subframe 5, and an auxiliary machine of the motor 6 provided behind the motor 6. A dash that divides the internal space of the vehicle body back and forth between the component 7, the fixing portion (front cross member 11) to which the rear end portion of the subframe 5 is fixed, and the auxiliary machine component 7 and the fixing portion. A first easily deformable portion A is formed between the support portion of the motor 6 and the rear end portion of the subframe 5, and the dash panel 10 has a first easily deformable portion A. Two easily deformable portions B are formed, and a protector 13 supported by at least one of the subframe 5 and the motor 6 is formed between the auxiliary machine component 7 and the second easily deformable portion B. It is characterized by being arranged.
Therefore, the vehicle body front structure 1 protects the auxiliary parts 7 by the protector 13 at the time of a front collision of the vehicle, particularly a miniaturized vehicle having a short front overhang, and the first easily deformable portion A and the second easily deformable portion A and the second. By deforming the easily deformable portion B of the above, the collision energy can be suitably absorbed.

Further, the vehicle body front structure 1 is characterized in that the protector 13 has a higher rigidity than the second easily deformable portion B.
Therefore, the vehicle body front structure 1 preferably protects the auxiliary component 7 by the protector 13 at the time of a front collision of the vehicle, and more preferably absorbs the collision energy by deforming the second easily deformable portion B. be able to.

Further, the vehicle body front structure 1 includes a mount 9 fixed to the subframe 5 to support the motor 6, and the mount 9 is fixed when a front collision load is input to the subframe 5. It is characterized in that it is provided at a position where it can come into contact with the portion.
Therefore, the vehicle body front structure 1 can regulate the retreat of the auxiliary machine component 7 by the contact between the mount 9 and the fixed portion, and can protect the vehicle interior (occupant space) in addition to the auxiliary machine component 7.

Further, the vehicle body front structure 1 is characterized in that the protector 13 is attached to the rear surface of the mount 9.
Therefore, in the vehicle body front structure 1, since the protector 13 is arranged at a position facing the motor 6 with reference to the mount 9, the protector 13 functions as a mass damper and can suppress the vibration of the motor 6.

Further, the vehicle body front structure 1 is characterized in that the mount 9 is provided on the side of the auxiliary machine component in the vehicle width direction.
Therefore, the vehicle body front structure 1 can protect the auxiliary machine component 7 from a collision object by the mount 9 at the time of a side collision of the vehicle.

Further, the vehicle body front structure 1 is characterized in that the mount and the protector have a closed cross-sectional shape in a side view.
Therefore, in the vehicle body front structure 1, the protector 13 comes into contact with the second easily deformable portion B of the dash panel 10, and the load input (reaction force) from the dash panel 10 is transmitted to the mount 9 via the protector 13. At that time, since the rigidity of the load portion is increased and the load transmission efficiency is improved, the collision energy at the time of a front collision can be absorbed more efficiently.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be appropriately modified without departing from the gist of the present invention.

1 Body front structure 5 Subframe 6 Motor 7 Auxiliary parts 9 Mount 10 Dash panel 11 Front cross member (fixed part)
13 Protector A 1st easy deformation part B 2nd easy deformation part

Claims (6)

A subframe that extends in the front-back direction and
The motor supported by the subframe and
Auxiliary parts of the motor provided on the rear side of the motor and
A fixed portion to which the rear end of the subframe is fixed,
A dash panel that divides the internal space of the vehicle body back and forth between the auxiliary parts and the fixed portion, and
With
A first easily deformable portion is formed between the support portion of the motor and the rear end portion of the subframe.
A second easily deformable portion is formed on the dash panel.
A vehicle body front structure characterized in that a protector supported by at least one of the subframe and the motor is arranged between the auxiliary machine component and the second easily deformable portion. The vehicle body front structure according to claim 1, wherein the protector has higher rigidity than the second easily deformable portion. A mount that is fixed to the subframe and supports the motor
The vehicle body front portion according to claim 1 or 2, wherein the mount is provided at a position where it can come into contact with the fixed portion when a front impact load is input to the subframe. Construction. The vehicle body front structure according to claim 3, wherein the protector is attached to the rear surface of the mount. The vehicle body front structure according to claim 3 or 4, wherein the mount is provided on the side of the auxiliary machine component in the vehicle width direction. The vehicle body front structure according to claim 4 or 5, wherein the mount and the protector have a closed cross-sectional shape in a side view.

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