CN109878576B

CN109878576B - Vehicle front structure

Info

Publication number: CN109878576B
Application number: CN201811203186.5A
Authority: CN
Inventors: 大仓康平
Original assignee: Suzuki Motor Corp
Current assignee: Suzuki Motor Corp
Priority date: 2017-12-06
Filing date: 2018-10-16
Publication date: 2021-08-31
Anticipated expiration: 2038-10-16
Also published as: FR3076801A1; JP2019099038A; JP7037741B2; FR3076801B1; CN109878576A; DE102018131136A1; DE102018131136B4

Abstract

The invention provides a vehicle front structure, which can improve the rigidity of an upper vehicle body and a vehicle body mounting part fixing part, can improve the vibration characteristic of a vehicle front part and the like, and can effectively disperse the input to the vehicle body mounting part at the vehicle front part. In the vehicle front structure, an upper vehicle body is fixed to a chassis frame by a vehicle body mount (40), and a vehicle body mount fixing portion (4) for fixing the vehicle body mount is arranged at a lower portion of the upper vehicle body. The vehicle body attachment fixing part (4) has: a mounting piece fixing surface (41) having a fixing hole for fixing a vehicle body mounting piece (40); a side wall portion located in a width direction of the mount fixing surface and extending in an up-down direction; and a vertical wall part (43) which is positioned in the front-rear direction of the mounting piece fixing surface and extends in the vertical direction, wherein a bracket member (34) with a closed cross section shape extending in the vertical direction is jointed on the side wall part, and a cross beam (35) with a closed cross section shape extending in the width direction is jointed on the vertical wall part.

Description

Vehicle front structure

Technical Field

The present invention relates to a vehicle front structure.

Background

A conventional vehicle front structure is known as follows: fenders are disposed on both sides of a front portion of a vehicle body in an engine compartment portion, side reinforcing members that form a closed cross-sectional structure in cooperation with the fenders are provided on an inner side portion of the fender, and front and rear end portions of the side reinforcing members are connected to a chassis frame via a vehicle body mount (see, for example, patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 7-267135

Disclosure of Invention

Problems to be solved by the invention

However, in the above-described conventional vehicle front structure, the vehicle body and the chassis frame of the engine compartment portion are merely connected by the vehicle body mount or the vehicle body attachment member, and therefore there is a problem that it is difficult to improve the rigidity of the vehicle body attachment fixing portion, and it is not possible to improve the vibration characteristics of the vehicle front portion.

Further, in the conventional vehicle front structure, since the side reinforcing member is provided at the inner side portion of the fender, there are problems as follows: the improvement in rigidity of the front portion of the vehicle is limited and a side reinforcing member is required, resulting in an increase in the number of parts and high cost.

The present invention has been made in view of such a situation, and an object thereof is to provide a vehicle front structure that can improve the rigidity of an upper vehicle body and a vehicle body attachment fixing portion, can improve vibration characteristics and the like of a vehicle front portion, and can effectively disperse input to a vehicle body attachment at the vehicle front portion.

Means for solving the problems

In order to achieve the above object, a vehicle front structure according to the present invention includes a chassis frame and an upper vehicle body fixed to the chassis frame by a vehicle body mount, and a vehicle body mount fixing portion for fixing the vehicle body mount is disposed at a lower portion of the upper vehicle body, and the vehicle front structure includes: an attachment member fixing surface having a fixing hole for fixing the vehicle body attachment member; a side wall portion that is located in a vehicle width direction of the mount fixing surface and extends in a vehicle vertical direction; and a vertical wall portion that is located in a vehicle front-rear direction of the mount fixing surface and extends in a vehicle vertical direction, the side wall portion being joined with a bracket member having a closed cross-sectional shape that extends in the vehicle vertical direction, and the vertical wall portion being joined with a cross member having a closed cross-sectional shape that extends in a vehicle width direction.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to improve the rigidity of the upper vehicle body and the vehicle body attachment fixing portion, improve the vibration characteristics of the vehicle front portion, and the like, and effectively disperse the input to the vehicle body attachment in the vehicle front portion.

As described above, the vehicle front structure of the present invention includes a chassis frame and an upper vehicle body fixed to the chassis frame by a vehicle body mount, and a vehicle body mount fixing portion for fixing the vehicle body mount is disposed at a lower portion of the upper vehicle body, and the vehicle body mount fixing portion includes: an attachment member fixing surface having a fixing hole for fixing the vehicle body attachment member; a side wall portion that is located in a vehicle width direction of the mount fixing surface and extends in a vehicle vertical direction; and a vertical wall portion that is located in a vehicle front-rear direction of the mount fixing surface and extends in a vehicle vertical direction, the side wall portion being joined with a bracket member having a closed cross-sectional shape that extends in the vehicle vertical direction, and the vertical wall portion being joined with a cross member having a closed cross-sectional shape that extends in a vehicle width direction.

Therefore, in the vehicle front structure of the present invention, the periphery of the vehicle body attachment fixing portion is surrounded by the wall portion and the member having the closed cross-sectional shape, so that it is possible to easily improve the rigidity of the vehicle front portion and the vehicle body attachment fixing portion without separately using a reinforcing member, to improve the vibration characteristics of the vehicle front portion, and the like, and to reduce the component cost.

In the vehicle front structure of the present invention, the vehicle body attachment fixing portion and the vehicle front portion are connected by the member having the closed cross-sectional shape, so that input to the vehicle body attachment can be effectively dispersed in the vehicle front portion, concentration of stress to the vehicle body attachment fixing portion can be prevented, and durability can be improved.

Drawings

Fig. 1 is a perspective view of a chassis frame and an upper body of a vehicle front structure to which an embodiment of the present invention is applied, as viewed from diagonally above the front side of the vehicle.

Fig. 2 is a cross-sectional view of the vehicle front portion of fig. 1, as viewed from above the vehicle, of the front body mount fixing portion and the peripheral portion thereof located on the left side of the vehicle.

Fig. 3 is a sectional view taken along line a-a of fig. 2.

Fig. 4 is a sectional view taken along line B-B of fig. 2.

Description of the reference numerals

1. A vehicle front portion; 2. a chassis frame; 3. an upper body; 4. a vehicle body mounting member fixing portion; 4A, a front side vehicle body installation part fixing part; 5. a fastening member; 6. a mount-side member; 31. a baffle stringer; 34. a bracket member; 35. a cross beam; 40. a vehicle body mount; 41. a mounting member fixing surface; 41a, a fixing hole; 42. a sidewall portion; 42a, an inner side wall portion; 42b, an outer side wall portion; 43. a longitudinal wall portion; 43a, a vertical wall portion on the vehicle front side; s, power unit carrying space.

Detailed Description

The present invention will be described in detail below based on the illustrated embodiments.

Fig. 1 to 4 show a vehicle front structure according to an embodiment of the present invention. In the figure, the arrow Fr direction indicates the vehicle front direction, the arrow U direction indicates the vehicle upper direction, the arrow X direction indicates the vehicle width direction, and the arrow Y direction indicates the vehicle front-rear direction.

As shown in fig. 1, a vehicle front portion 1 to which the structure of the embodiment of the present invention is applied mainly includes a chassis frame 2 extending in the vehicle front-rear direction and provided on the left and right sides in the vehicle width direction at the lower portion of a power unit mounting space S, and an upper vehicle body 3 provided at the upper portion of the power unit mounting space S, and the upper vehicle body 3 is fixed to the chassis frame 2 by a vehicle body mount 40. Therefore, the vehicle body attachment fixing portion 4 for fixing the vehicle body attachment 40 is disposed at the lower portion of the upper vehicle body 3.

The upper body 3 is configured by a dash side member 31 and a fender panel 32 provided on both left and right sides of the vehicle front portion 1 in the vehicle width direction, a case lock member 33, a bracket member 34, and a cross member 35 provided on the vehicle front side of the vehicle front portion 1, a dash panel 36 and a dash side panel 37 provided on the vehicle rear side of the vehicle front portion 1, and the like.

The housing lock member 33 and the cross member 35 extend in the vehicle width direction, and the housing lock member 33 is arranged in parallel with the cross member 35 at a position above the cross member 35. The housing lock members 33 are fixed to upper end portions of the bracket members 34 that are positioned on both left and right sides in the vehicle width direction and extend in the vehicle vertical direction, and are configured to overlap the bracket members 34 on both left and right sides. As a result, the left and right front vehicle body attachment fixing portions 4A described later are connected to each other, and therefore, the rigidity of the vehicle body attachment fixing portions 4 can be further improved.

As shown in fig. 1 to 4, the vehicle body attachment fixing portions 4 of the present embodiment are configured to include a pair of left and right front vehicle body attachment fixing portions 4A disposed on the vehicle front side of the upper vehicle body 3 and a pair of left and right rear vehicle body attachment fixing portions 4B disposed on the vehicle rear side of the upper vehicle body 3. In the vehicle front structure of the present embodiment, the front-side vehicle-body attachment fixing portion 4A on the vehicle left side, out of the pair of left and right front-side vehicle-body attachment fixing portions 4A, is explained, and the front-side vehicle-body attachment fixing portion 4A on the vehicle right side is also configured in the same structure, so that the explanation thereof is omitted.

As shown in fig. 2 to 4, the front-side vehicle body attachment fixing portion 4A includes: a mount fixing surface 41 having a fixing hole 41a to which the vehicle body mount 40 is fixed by a fastening member 5 such as a long bolt, and having a substantially rectangular shape in plan view; side wall portions 42 that are located on both left and right sides in the vehicle width direction of the mount fixing surface 41 and extend in the vehicle vertical direction; and vertical wall portions 43 that are located on both front and rear sides in the vehicle front-rear direction of the attachment fixing surface 41 and extend in the vehicle vertical direction. The upper ends of the side wall portions 42 and the vertical wall portions 43 are formed to be higher than the upper portion of the vehicle body attachment 40 in a state where the vehicle body attachment 40 is fixed to the fixing hole 41a of the attachment fixing surface 41. That is, the periphery of the vehicle body attachment member 40 is surrounded by the left and right side wall portions 42 and the front and rear vertical wall portions 43 in a state where the vehicle body attachment member 40 is fixed to the fixing hole 41a of the attachment member fixing surface 41.

A bracket member 34 having a closed cross-sectional shape extending in the vehicle vertical direction is joined to an inner side wall portion 42a on the vehicle inner side (vehicle center side), and a cross member 35 having a closed cross-sectional shape extending in the vehicle width direction is joined to a vertical wall portion 43a on the vehicle front side. And, the bracket member 34 and the cross member 35 are engaged with each other. Thus, the vehicle body mounts 40 are connected to the members having the closed cross-sectional shapes extending in different directions, and the members having the closed cross-sectional shapes are joined to each other, so that the front vehicle body mount fixing portion 4A can be configured to have a structure having higher rigidity.

As shown in fig. 2 to 4, the side wall portion 42 of the present embodiment is constituted by an inner side wall portion 42a located on the vehicle width direction inner side with respect to the fixing hole 41a of the attachment fixing surface 41 and an outer side wall portion 42b located on the vehicle width direction outer side with respect to the fixing hole 41a of the attachment fixing surface 41. The bracket member 34 having a closed cross-sectional shape is joined to the inner side wall portion 42a, and the apron side member 31 having a closed cross-sectional shape extending in the vehicle front-rear direction is joined to the outer side wall portion 42 b. Thus, the bracket member 34 having a closed cross-sectional shape is provided on the inner side wall portion 42a and the baffle side member 31 having a closed cross-sectional shape is provided on the outer side wall portion 42b with respect to the fixing hole 41a of the attachment fixing surface 41, and the rigidity of the front vehicle body attachment fixing portion 4A is further improved.

As shown in fig. 2 to 4, the cross member 35 of the present embodiment is disposed on the vehicle front side of the fixing hole 41a of the attachment fixing surface 41, and the rear surface 35a of the cross member 35 and the inner surface 31a of the apron side member 31 are connected by the attachment side member 6. That is, as shown in fig. 2 and 4, the mount-side member 6 is formed into a closed cross-sectional shape continuously with the cross member 35 and the baffle longitudinal member 31 between the closed cross-sectional shape cross member 35 and the closed cross-sectional shape baffle longitudinal member 31, respectively. Therefore, the attachment-side member 6 has a substantially hat-shaped cross section, and the upper and

lower flange portions

6a, 6b are joined to the outer side wall portion 42b, and are connected to the rear surface 35a of the cross member 35 and the inner side surface 31a of the apron side member 31 via the outer side wall portion 42 b. Accordingly, the closed cross-section structural bodies such as the cross member 35 and the dash side member 31 are connected to each other by the attachment-side member 6 having a closed cross-sectional shape, so that the strength and rigidity of the joint portion can be ensured, and the rigidity of the front-side vehicle body attachment fixing portion 4A can be further improved.

Therefore, in the structure of the vehicle front portion 1 of the present embodiment, the closed cross section extends in the vehicle front-rear direction, the vehicle width direction, and the vehicle vertical direction with the front-side vehicle body attachment fixing portion 4A as the center, and the periphery of the front-side vehicle body attachment fixing portion 4A is surrounded by the closed cross-sectional shape portion.

In the structure of the vehicle front portion 1 of the present embodiment, as shown in fig. 2, the outer side end portion 35b of the cross member 35 in the vehicle width direction is located at a distance L on the vehicle inner side from the outer side end portion 4Aa of the front-side vehicle body attachment fixing portion 4A in the vehicle width direction. The front surface 35c of the cross member 35 has an inclined surface 35d, and the inclined surface 35d is located rearward of the vehicle as it faces toward the vehicle outer side relative to the vehicle center portion. Thus, the outer end portion 35b of the cross member 35 is positioned further toward the vehicle inner side than the outer end portion 4Aa of the front vehicle body mount fixing portion 4A, and a space is secured on the outer side of the cross member 35. Further, the cross-sectional area of the closed cross-sectional shape of the outer end portion 35b of the cross member 35 is formed small by the inclined surface 35d, and a space serving as a cushion space can be provided in the front of the vehicle, thereby reducing impact energy acting on the closed cross-sectional portion structure at the time of collision with a pedestrian.

The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

Claims

1. A front structure of a vehicle is provided,

the vehicle front structure has a chassis frame and an upper vehicle body fixed to the chassis frame by a vehicle body mount,

a vehicle body attachment fixing portion for fixing the vehicle body attachment is disposed at a lower portion of the upper vehicle body, and the vehicle front structure is characterized in that,

the vehicle body attachment fixing part includes: an attachment member fixing surface having a fixing hole for fixing the vehicle body attachment member; a side wall portion that is located in a vehicle width direction of the mount fixing surface and extends in a vehicle vertical direction; and a vertical wall portion located in a vehicle front-rear direction of the attachment member fixing surface and extending in a vehicle vertical direction,

a bracket member of a closed cross-sectional shape extending in a vehicle vertical direction is joined to the side wall portion, and a cross member of a closed cross-sectional shape extending in a vehicle width direction is joined to the vertical wall portion,

the side wall portion is constituted by an inner side wall portion located on the vehicle width direction inner side with respect to the fixing hole of the attachment piece fixing surface and an outer side wall portion located on the vehicle width direction outer side with respect to the fixing hole of the attachment piece fixing surface,

the bracket member is joined to the inner side wall portion, and a closed cross-sectional shape dash rail extending in the vehicle longitudinal direction is joined to the outer side wall portion.

2. The vehicle front structure according to claim 1,

the bracket member is engaged with the cross member.

3. The vehicle front structure according to claim 1 or 2,

the cross member is disposed on the vehicle front side of the fixing hole of the mounting member fixing surface, the rear surface of the cross member is connected to the inner side surface of the apron side member via a mounting member side member,

the mount-side member is formed with a closed cross-sectional shape that is located between the cross member of the closed cross-sectional shape and the baffle longitudinal member of the closed cross-sectional shape and is formed at a position that is continuous with the cross member and the baffle longitudinal member, respectively.

4. The vehicle front structure according to claim 1 or 2,

the outer end portion of the cross member in the vehicle width direction is located further toward the vehicle inner side than the outer end portion of the vehicle body mount fixing portion in the vehicle width direction,

the front surface of the cross member has an inclined surface, and the position of the inclined surface on the vehicle outer side is closer to the vehicle rear side than the position of the vehicle center portion of the front surface.