JP2019156090A - Vehicle front structure - Google Patents

Abstract

To provide a vehicle front structure capable of ensuring the rigidity of a suspension member.SOLUTION: The vehicle front structure includes first and second collars 50, 60, and the first and second collars 50, 60 are mounted on a lower wall 22f of a suspension member 20 and are in contact with an upper wall 22e of the suspension member 20. Accordingly, inputs from a fuel cell stack 30 ad a stabilizer 40 can be received by a hollow structure composed of the upper wall 22e, the lower wall 22f and the collars 50, 60. Thus, the rigidity of the suspension member 20 can be ensured. The first and second collars 50, 60 are mounted on the lower wall 22f using the same reinforcement 90, therefore, an effect of high rigidity by both of the first and second collars 50, 60 can be achieved at the same time. Thus, the rigidity of the suspension member 20 can be ensured with high effect.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a vehicle front structure in which a fuel cell stack and a stabilizer are attached to a suspension member.

  Japanese Patent Laying-Open No. 2017-87849 discloses a vehicle front structure in which a fuel cell stack mounted in a vehicle front (inside an engine compartment) is attached to a suspension member via a mount.

However, the structure disclosed in the above publication has the following problems.
When evaluating the strength of the suspension member part (stack attachment part) to which the fuel cell stack is attached, the dominant input when traveling on rough roads, which is the evaluation item, is the vertical input, but the height of the fuel cell stack is In the case where the input is offset upward from the mounting portion, a large moment input is applied to the stack mounting portion even when the input is originally low and before and after the left and right inputs. Further, when not only the fuel cell stack but also the stabilizer is attached to the suspension member, the suspension member needs to withstand the input from the fuel cell stack and in addition to the input from the stabilizer.

  In order to ensure the rigidity of the suspension member, it is conceivable to add a rigid member such as a bulk to the outer surface of the suspension member, or to increase the thickness of the suspension member. However, it is difficult to add a rigid member such as a bulk due to a clearance around the suspension member. Further, increasing the plate thickness to such an extent that rigidity can be ensured increases the weight.

JP 2017-87849 A

An object of the present invention is to provide a vehicle front structure that can ensure the rigidity of a suspension member.

The present invention for achieving the above object is as follows.
(1) a suspension member having an upper wall and a lower wall;
A fuel cell stack attached to the suspension member using a first attachment member;
A stabilizer attached to the suspension member using a second attachment member;
A first collar provided in the suspension member with the vertical direction as an axial direction and into which the first mounting member is inserted;
A second collar provided in the suspension member with the vertical direction as an axial direction and into which the second mounting member is inserted;
Have
Each of the first and second collars is attached to one of the upper wall and the lower wall of the suspension member using the same reinforcement at one end in the axial direction, and the suspension at the other end in the axial direction. A vehicle front structure in contact with the other of the upper and lower walls of the member.

According to the vehicle front structure of (1) above, the following effects can be obtained.
First and second collars are provided, and the first and second collars are respectively attached to one of the upper and lower walls of the suspension member at one end in the axial direction, and the other end in the axial direction. In contact with the other of the upper and lower walls of the suspension member. Therefore, the input to the suspension member from the fuel cell stack and the stabilizer can be received by the hollow structure including the upper wall, the lower wall, and the collar of the suspension member. Therefore, since the input can be received with the surface rigidity (bending rigidity) of the entire hollow structure, the rigidity of the suspension member can be ensured.

  Further, since the first and second collars are attached to one of the upper wall and the lower wall of the suspension member using the same reinforcement, the collar of the suspension member portion (stack attachment portion) to which the fuel cell stack is attached (stack attachment portion) The rigidity improvement effect by both the first collar) and the collar (second collar) of the suspension member portion (stabilizer mounting portion) to which the stabilizer is mounted can be obtained at the same time. Therefore, the rigidity of the suspension member can be effectively ensured.

  Since this structure is a structure in which a collar and reinforcement are provided inside the suspension member, there is no need to provide a rigid member such as a bulk on the outer surface of the suspension member, and it is not necessary to increase the thickness of the suspension member. is there. Therefore, there is no problem due to the peripheral component gap of the suspension member, and the increase in weight is suppressed as compared with the case where the thickness of the suspension member is increased.

1 is a schematic side view of a vehicle front structure according to an embodiment of the present invention. It is a schematic perspective view which shows a suspension member and a mount member in the vehicle front part structure of the Example of this invention. It is a schematic plan view of a suspension member in the vehicle front part structure of the embodiment of the present invention. FIG. 4 is an enlarged perspective view of a part A in FIG. 3. In FIG. 4, it is the perspective view which abbreviate | omitted the upper panel (joining part upper panel). FIG. 6 is an enlarged sectional view taken along line BB in FIG. 5.

  A vehicle front structure according to an embodiment of the present invention will be described below with reference to the drawings. In the figure, UP indicates the upper side, and FR indicates the front side of the vehicle.

  The vehicle front structure 10 according to the embodiment of the present invention includes a suspension member (front suspension member) 20, a fuel cell stack 30, a stabilizer 40, a first collar 50, a second collar 60, and a first mounting member 70. The second attachment member 80 and the reinforcement 90 are included.

  As shown in FIGS. 2 and 3, the suspension member 20 is disposed in the vehicle width direction between the pair of side portions 21 that are arranged in the vehicle width direction and extend in the vehicle front-rear direction, and between the pair of side portions 21. And extending first to third cross portions 22, 23, 24.

  Each of the pair of side portions 21 has a neck portion 21g (see FIG. 1) whose front side is an upper position compared to the rear side at an intermediate portion in the vehicle front-rear direction which is an extending direction. Each of the pair of side portions 21 includes a side front portion 21a extending to the vehicle front side and the vehicle width direction outer side, a side rear portion 21b extending from the vehicle rear side end portion of the side front portion 21a to the vehicle rear side and the vehicle width direction outer side, Have The cross-sectional shape orthogonal to the longitudinal direction of the side portion 21 is a hollow closed cross-sectional shape formed by welding the side portion upper panel 21c and the side portion lower panel 21d to each other by welding as shown in FIG. ing.

  As shown in FIGS. 2 and 3, the first cross portion 22 is provided at the vehicle front side end portion of the side front portion 21 a or in the vicinity thereof. The 1st cross part 22 has the junction part 22a joined to the side front part 21a in the vehicle width direction outer side edge part. The joint portion 22a has a length in the vehicle front-rear direction larger than the vehicle width direction center portion 22b of the first cross portion 22.

  As illustrated in FIG. 6, the joint portion 22 a includes a joint portion upper panel 22 c and a joint portion lower panel 22 d. The joint upper panel 22c constitutes the upper wall 22e of the joint 22a, and the joint lower panel 22d constitutes the lower wall 22f of the joint 22a. The joint part upper panel 22c is joined to the side part upper panel 21c of the side part 21 by welding at the outer end in the vehicle width direction. The joint portion lower panel 22d is joined to the side portion lower panel 21d of the side portion 21 by welding at the outer end in the vehicle width direction. Moreover, the vehicle width direction inner side edge part of the junction part upper panel 22c and the junction part lower panel 22d is mutually joined by welding.

  As shown in FIGS. 2 and 3, the second cross portion 23 is disposed on the rear side of the vehicle with a space from the first cross portion 22. The 2nd cross part 23 is joined to the vehicle front-back direction intermediate part of the side front part 21a by welding. The third cross portion 24 is arranged at a distance from the second cross portion 23 on the vehicle rear side. The 3rd cross part 24 is joined to the boundary part of the side front part 21a and the side rear part 21b, and its vicinity by welding.

  As shown in FIG. 1, the fuel cell stack 30 is disposed on the upper side of the suspension member 20. The fuel cell stack 30 is supported by a joint portion 22a of the suspension member 20 via a front mount member 31, and supported by a rear mount support portion 21h provided on the side portion 21 of the suspension member 20 via a rear mount member 32. Has been.

  The front mount member 31 and the rear mount member 32 are provided so as to protrude upward from the suspension member 20. For this reason, the fuel cell stack 30 is arranged offset upward from the suspension member 20. The front mount member 31 is on the vehicle front side with respect to the neck portion 21g of the side portion 21, and the rear mount member 32 is on the vehicle rear side with respect to the neck portion 21g of the side portion 21. For this reason, the front mount member 31 is provided above the rear mount member 32.

  The front mount member 31 has a substantially triangular shape whose length in the vehicle front-rear direction decreases as it goes upward when viewed from the vehicle width direction, and is connected to the fuel cell stack 30 at its upper end, and its lower end The suspension member 20 is connected to the upper wall 22e of the joint portion 22a.

  As shown in FIG. 6, the fuel cell stack 30 is attached to the upper wall 22 e of the joint portion 22 a through the front mount member 31 using the first attachment member 70. The first attachment member 70 is, for example, a bolt. The front mount member 31 is attached using two first attachment members 70 (at two points). As shown in FIG. 4, the position at which the front mount member 31 is attached to the joint portion 22a (reference numeral 22e1 position in FIG. 4) is the vehicle front-rear direction, and the position at which the stabilizer 40 is attached to the joint portion 22a at two points (FIG. 4). The position is on the inside of the position 22e2). For this reason, compared with the case where the attachment position (reference numeral 22e1 in FIG. 4) of the front mount member 31 is outside the attachment position (reference numeral 22e2 in FIG. 4) of the stabilizer 40 to the attachment part 22a. Thus, the mounting position of the front mount member 31 to the joint portion 22a can be made compact, and the attachment of the front mount member 31 to the joint portion 22a is prevented from being obstructed by peripheral components.

  The stabilizer 40 has a stabilizer bar (not shown) that bridges left and right suspensions (not shown), and has a stabilizer bracket 41 for attaching the stabilizer bar to the suspension member 20 as shown in FIG. Yes. The stabilizer bracket 41 is attached to the lower wall 22f of the joint portion 22a of the suspension member 20 by using a second attachment member 80 made of, for example, a bolt. The stabilizer bracket 41 is attached using two second attachment members 80 (two points).

  The fuel cell stack 30 and the stabilizer 40 are both attached to the joint portion 22a of the first cross portion 22 of the suspension member 20 (attached to the same portion). Therefore, the joint portion 22 a of the first cross portion 22 of the suspension member 20 needs to have rigidity and strength that can withstand both the input from the fuel cell stack 30 and the input from the stabilizer 40. Therefore, first and second collars 50 and 60 are provided.

  Both the first and second collars 50 and 60 are provided inside the joint portion 22a. Each of the first and second collars 50 and 60 has a right cylindrical shape and is provided with the vertical direction as the axial direction. A first mounting member 70 is inserted into the first collar 50, and a second mounting member 80 is inserted into the second collar 60. It is desirable that the first and second collars 50 and 60 have the same shape. This is because the first and second collars 50 and 60 can be shared, which is advantageous in terms of cost.

  The first and second collars 50 and 60 are attached to the lower wall 22f of the joint portion 22a using the same reinforcement 90 at the one end portions 51 and 61 in the axial direction, respectively, and the other end portion 52 in the axial direction. 62 in contact with the upper wall 22e of the joint 22a. However, the first and second collars 50 and 60 are attached to the upper wall 22e of the joint portion 22a by using the reinforcement 90 at one end portions 51 and 61 in the axial direction, respectively, and the other end portion 52 in the axial direction. , 62 may be in contact with the lower wall 22f of the joint portion 22e.

  The plate thicknesses of the first and second collars 50 and 60 are set such that buckling does not occur due to inputs from the fuel cell stack 30 and the stabilizer 40. The plate thickness of the first and second collars 50 and 60 is larger than the plate thickness of the suspension member 20, for example, more than twice the plate thickness of the joint portion 22 a of the suspension member 20.

  The first and second collars 50 and 60 are joined to the same reinforcement 90 by welding. The reinforcement 90 has a plate shape and is joined to the lower wall 22f of the joining portion 22a by welding. The reinforcement 90 may have a plurality of components fixed to each other, but it is desirable that the reinforcement 90 has a one-component configuration in order to reduce the number of components.

  The first mounting member 70 includes a hole 31a formed in the front mount member 31, a first hole 22e1 provided in the upper wall 22e of the joint portion 22a, a first collar 50, a first hole 91 provided in the reinforcement 90, and a joint. The portion 22a is inserted into a first hole 22f1 provided in the lower wall 22f, and is screwed into a first weld nut 100 joined to the lower surface of the lower wall 22f. Accordingly, the fuel cell stack 30 is fixedly attached to the joint portion 22a via the front mount member 31.

  The second mounting member 80 includes a hole 41a formed in the stabilizer bracket 41, a second hole 22f2 provided in the lower wall 22f of the joint 22a, a second hole 92 provided in the reinforcement 90, a second collar 60, and a joint. 22a is inserted into a second hole 22e2 provided in the upper wall 22e, and is screwed into a second weld nut 110 joined to the upper surface of the upper wall 22e. Thereby, the stabilizer 40 is fixedly attached to the joint portion 22a.

  Next, the operation and effect of the embodiment of the present invention will be described.

  The front mount member 31 is attached to the upper wall 22e of the joint portion 22a of the suspension member 20. For this reason, when the first collar 50 is not provided, the input from the fuel cell stack 30 must be received by the surface rigidity of the upper wall 22e. In this case, the out-of-plane deformation of the upper wall 22e is large, and high stress may be generated. A stabilizer 40 is attached to the lower wall 22e of the joint portion 22a of the suspension member 20. Therefore, when the second collar 60 is not provided, the input from the stabilizer 40 must be received by the surface rigidity of the lower wall 22f. In this case, the out-of-plane deformation of the lower wall 22f is large, and high stress may be generated.

  On the other hand, in the embodiment of the present invention, the first and second collars 50 and 60 are provided, and the first and second collars 50 and 60 are respectively mounted on the suspension member 20 at axial end portions 51 and 61, respectively. It is attached to one of the wall 22e and the lower wall 22f, and is in contact with the other of the upper wall 22e and the lower wall 22f of the suspension member 20 at the other end portions 52 and 62 in the axial direction. Therefore, the input to the suspension member 20 from the fuel cell stack 30 and the stabilizer 40 can be received by a hollow structure including the upper wall 22e, the lower wall 22f, and the collars 50, 60 of the suspension member 20. Therefore, since the input can be received with the surface rigidity (bending rigidity) of the entire hollow structure, the out-of-plane deformation of the upper wall 22e and the lower wall 22f is greatly reduced, and not only the rigidity of the suspension member 20 but also the strength is ensured. Can do. Therefore, it becomes a high-strength structure that has a positive influence on the strength performance of peripheral parts. Further attention to other performance results in improved steering stability (due to a decrease in the displacement of the force applied to the suspension arm, not shown), resulting in a highly rigid structure that has a positive effect on other performance. .

  Further, since the first and second collars 50 and 60 are attached to one of the upper wall 22e and the lower wall 22f of the suspension member 20 using the same reinforcement 90, the suspension member 20 to which the fuel cell stack 30 is attached. It is possible to simultaneously obtain the rigidity improvement effect by both the collar (first collar 50) of the portion (stack attachment portion) and the collar (second collar 60) of the suspension member 20 portion (stabilizer attachment portion) to which the stabilizer 40 is attached. it can. Therefore, the rigidity of the suspension member 20 can be effectively ensured.

If an attempt is made to satisfy the same level of performance as the embodiment of the present invention except for the structure of the embodiment of the present invention, for example, when measures are taken with a plate thickness, the thickness of the mounting plate is about 5.2 mm. However, it is not realistic due to the relationship with peripheral parts (diverted parts), etc. (up to about 3.6 mm from the viewpoint of sheet clearance, welding relation, etc.). Further, as a measure for reducing the input from the fuel cell stack 30, there is a means for reducing the height of the fuel cell stack 30 with respect to the suspension member 20. However, since the height of the fuel cell stack 30 is determined by a collision requirement or the like, Implementing this will impair safety performance, which is also not realistic.
From the above viewpoints, it can be said that the structure of the embodiment of the present invention which greatly improves performance not only in rigidity but also in strength and has a positive influence on other performance requirements is an excellent structure.

DESCRIPTION OF SYMBOLS 10 Vehicle front part structure 20 Suspension member 21 Side part 21a Side front part 21b Side rear part 21c Side part upper panel 21d Side part lower panel 21g Neck part 21h Rear mount support part 22-24 1st-3rd cross part 22a Joint part 22b 1st 1 cross part vehicle width direction center part 22c joint part upper panel 22d joint part lower panel 22e upper wall 22f lower wall 30 fuel cell stack 31 front mount member 32 rear mount member 40 stabilizer 41 stabilizer bracket 50 first collar 51 first collar shaft One end 52 in the direction The other end 60 in the axial direction of the first collar 60 The second collar 61 One end 62 in the axial direction of the second collar 70 The other end 70 in the axial direction of the second collar The first mounting member 80 The second mounting member 90 Reinforcement 100 1st weld nut 1 10 Second weld nut

Claims (1)

A suspension member having an upper wall and a lower wall;
A fuel cell stack attached to the suspension member using a first attachment member;
A stabilizer attached to the suspension member using a second attachment member;
A first collar provided in the suspension member with the vertical direction as an axial direction and into which the first mounting member is inserted;
A second collar provided in the suspension member with the vertical direction as an axial direction and into which the second mounting member is inserted;
Have
Each of the first and second collars is attached to one of the upper wall and the lower wall of the suspension member using the same reinforcement at one end in the axial direction, and the suspension at the other end in the axial direction. A vehicle front structure in contact with the other of the upper and lower walls of the member.

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