WO2022107410A1

WO2022107410A1 - Vehicle frame structure

Info

Publication number: WO2022107410A1
Application number: PCT/JP2021/031205
Authority: WO
Inventors: 浩則中
Original assignee: 三菱自動車工業株式会社
Priority date: 2020-11-20
Filing date: 2021-08-25
Publication date: 2022-05-27
Also published as: JPWO2022107410A1; JP7332061B2

Abstract

This vehicle frame structure comprises a support portion for a vehicle suspension device at a position separated from the connection portion with a cross member in the frame extension direction. A plurality of bulkheads that reinforce the interior of a frame are provided at the connection portion with the cross member while being spaced apart from each other in the frame extension direction. A first bulkhead among the plurality of bulkheads that is farther from the support portion is disposed closer to the support portion than the position where a component of the cross member is connected to the frame.

Description

Vehicle frame structure

The present invention relates to a frame structure at a connection portion with a vehicle cross member.

Vehicles such as pickup trucks are provided with a pair of side frames as strength members, for example, spaced apart from each other in the vehicle width direction. Further, the pair of side frames are connected by a cross member extending in the substantially width direction of the vehicle. In many cases, a plurality of cross members are provided at intervals in the front-rear direction of the vehicle.
Many of the frames that are required to be strong and lightweight, such as the side frames of vehicles, have a box shape. Further, as described in Patent Document 1, for example, by providing a bulkhead in the side frame at the connection portion of the cross member, the strength of the frame at the connection portion is improved.

Japanese Patent Application Laid-Open No. 2019-89411

By the way, a suspension device such as a leaf spring is suspended on a pair of side frames extending in the front-rear direction of the vehicle. Therefore, a relatively large load acts from the suspension device on the suspension location in this side frame.
Further, for a vehicle equipped with a packing box such as a pickup truck, a plurality of mount brackets for fixing the packing box to the side frame are provided. Therefore, a large load may be applied from the mount bracket to the side frame.

As described above, for a vehicle having a support portion on which a relatively large load acts on the side frame, it is necessary to secure the strength of the side frame in consideration of these loads.
In particular, when there is a support portion of the suspension device in the vicinity of the connection portion between the cross member and the side frame, a bulkhead is provided at the connection portion between the cross member and the side frame as in Patent Document 1, in the connection portion. Although the strength of the frame is improved, the twisting of the side frame due to the load from the suspension device may reduce the maneuverability, and the frame including the bulkhead is durable against repeated load when the vehicle is running. There was a demand for improved sex.

The present invention has been made to solve such a problem, and in a side frame in which a cross member is connected near a support portion of a suspension device, twisting of the side frame is suppressed to improve maneuverability. It is intended to provide a vehicle frame structure that improves durability.

In order to achieve the above object, the frame structure of the present invention is configured by connecting a pair of frames extending in the front-rear direction of the vehicle by a hollow cross member extending in the vehicle width direction, and the connection portion with the cross member is used to connect the frame structure. The frame is a vehicle frame structure in which a support portion of the suspension device of the vehicle is provided at a position separated in an extension direction of the frame, and a bulkhead that reinforces the inside of the frame at a connection portion with the cross member is the frame. The first bulkhead, which is provided apart from each other in the extension direction of the cross member and is far from the support portion among the plurality of bulkheads, is closer to the support portion than the connection position of the cross member member with the frame. It is characterized by being arranged.

As a result, the bulkheads that reinforce the inside of the frame at the connection with the cross member are provided apart from each other in the extension direction of the frame, thereby improving the strength and rigidity of the frame at the connection with the cross member. Can be done. Then, the first bulkhead, which is far from the support portion among the plurality of bulkheads, is arranged close to the support portion of the suspension device, thereby suppressing the twisting of the frame due to the load received from the support portion of the suspension device. Can be done.

Preferably, the mounting bracket is provided for fixing the packing box provided in the vehicle to the frame, and the mount bracket is a member of the second bulkhead and the cross member of the plurality of the bulkheads, which are close to the support portion. And, it is preferable that they are arranged at the same position in the extension direction of the frame.
As a result, the second bulkhead improves the strength and rigidity of the frame at the mounting position of the mount bracket, and the load received from the packing box via the mount bracket is distributed to the cross member via the second bulkhead. be able to.

Preferably, the frame is formed by fixing two frame members divided in the vehicle width direction, and the bulkhead is a plate formed by being divided in the vehicle width direction according to the divided frame members. A second bulkhead member, which is a shaped member and is fixed to the frame member on the connection side with the cross member, and a second bulkhead member fixed to the frame member on the side opposite to the connection side with the cross member. It is preferable that the bulkhead member is provided, and a part of the first bulkhead member and a part of the second bulkhead member are overlapped and connected to each other.

As a result, the bulkhead can be easily installed in the frame.
Preferably, in the bulkhead, the upper and lower ends of the plate-shaped member are bent toward the support portion of the suspension device to form a flange portion, and the flange portion and the inner wall of the frame are overlapped and fixed by welding. It is good to be there.
As a result, the bulkhead and the frame can be firmly fixed. Further, by bending the flange portion toward the support portion side of the suspension device, the connection portion (welded portion) formed by welding the bulkhead can be brought closer to the support portion side, and the durability of the welded portion of the bulkhead can be improved. can.

Preferably, the flange portion is formed on the first bulkhead member and fixed to the frame member, while the second bulkhead member abuts on the inner wall of the frame without bending the upper and lower end portions. It should be welded and fixed.
As a result, among the first bulkhead member and the second bulkhead member, the durability of the first bulkhead member whose stress increases due to the load from the support portion of the suspension device is improved in the welded portion. Can be done.

According to the frame structure of the vehicle of the present invention, by moving the installation position of the first bulkhead far from the support portion of the suspension device closer to the support portion, twisting of the frame due to the load received from the support portion of the suspension device is suppressed. be able to.
As a result, it is possible to improve the maneuverability of the vehicle and improve the durability of the frame at the first bulkhead and its connection portion by repeatedly receiving a load while the vehicle is running.

It is a perspective view which shows the schematic structure of the right rear part of the vehicle of embodiment of this invention. It is a perspective view which shows the schematic structure of the frame of the vehicle which concerns on this embodiment. It is a perspective view of the side frame near the support part of the suspension device which concerns on this embodiment. It is a top view which shows the structure near the connection part of the side frame and a cross member which concerns on 1st Embodiment. It is a top view which shows the structure near the connection part of the side frame and a cross member which concerns on 2nd Embodiment. It is a vertical sectional view which shows the shape of the bulkhead which concerns on 2nd Embodiment. It is a figure seen from the rear of the vehicle which shows the shape of the bulkhead which concerns on 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a schematic structure of a right rear portion of a vehicle 1 according to an embodiment of the present invention. FIG. 2 is a perspective view showing a schematic structure of a frame 2 of a vehicle 1 according to the present embodiment. FIG. 3 is a perspective view of the vicinity of the support portion of the suspension device 8 according to the present embodiment as viewed from the front outside in the vehicle width direction of the side frame 6.

The vehicle 1 that adopts the frame structure of the present invention is a vehicle having a packing box 4 at the rear of the vehicle, such as a pickup truck.

As shown in FIGS. 1 and 2, the vehicle 1 is provided with a pair of

side frames

5 and 6 extending in the vehicle front-rear direction at intervals in the vehicle width direction. Further, the axle of the rear wheel 7 of the vehicle 1 is suspended by the suspension device 8 by the leaf spring 11.

The packing box 4 is placed on the frame 2 and fixed to the mount brackets 3 fixed to the

side frames

5 and 6 by bolts and nuts (not shown).

A plurality of mount brackets 3 are provided on the outside of the

side frames

5 and 6 in the vehicle width direction at intervals in the vehicle front-rear direction. Of the plurality of mount brackets 3, the mount bracket 3 arranged at the rearmost position of the vehicle is provided near the vehicle front-rear position of the rearmost cross member 10 extending in the vehicle width direction and connecting the pair of

side frames

5 and 6. ing.

The cross member 10 is arranged closer to the front of the vehicle than the shackle 12 that supports the rear end of the leaf spring 11 that suspends the axle of the rear wheel 7. The shackle 12 is inserted into an insertion hole 13 provided in the side wall of the side frames 5 and 6, and is rotatably supported by the side frames 5 and 6 about an axis extending in the vehicle width direction. Further, the shackle 12 rotatably supports the rear end portion of the leaf spring 11 about an axis extending in the vehicle width direction.

As shown in FIGS. 1 to 3, the side frames 5 and 6 are formed by welding both ends of two

frame members

19 and 20 formed by bending a sheet metal member into a U shape and welding them together. There is. The side frames 5 and 6 have a hollow shape whose upper and lower cross sections are box-shaped cross sections, and have an upper wall 21, a lower wall 22, an inner side wall 23, and an outer wall 24. The upper wall 21 and the lower wall 22 have welding lines 25 which are butt portions of the

frame members

19 and 20.

The cross member 10 has a hollow shape whose upper and lower cross sections are box-shaped cross sections, and has an upper wall 26, a lower wall 27, a front wall 28, and a rear wall 29. The end portion of the cross member 10 in the vehicle width direction is abutted against the inner side wall 23 inside the side frames 5 and 6 in the vehicle width direction and fixed by welding.

Of the plurality of mount brackets 3, the mount bracket 3 arranged at the rearmost part of the vehicle has a U-shaped upper and lower cross section, and has an upper wall 30 and two

support side walls

31 and 32. The mount bracket 3 is arranged so that the upper wall 30 and the

support side walls

31 and 32 extend perpendicularly to the outer wall 24 of the side frames 5 and 6 in the vehicle width direction. The upper wall 30 of the mount bracket 3 is arranged so as to extend in the horizontal direction of the vehicle 1 at substantially the same vertical height as the upper walls 21 of the side frames 5 and 6. The two

support side walls

31 and 32 of the mount bracket 3 are arranged so as to be spaced apart from each other in the front-rear direction of the vehicle. Therefore, the U-shaped opening of the mount bracket 3 is arranged so as to face downward.

The end portions of the

support side walls

31 and 32 of the mount bracket 3 on the side frames 5 and 6 are bent vertically outward in the front-rear direction of the vehicle, and the outer flange portions 35 are provided respectively. The outer flange portion 35 and the outer wall 24 of the side frame are in contact with each other, and the outer peripheral portion of the outer flange portion 35 is fixed to the outer wall 24 by welding.

Bolt holes 37 are provided on the upper wall 30 of the mount bracket 3. Then, a bolt is inserted into the bolt hole 37 together with a bolt hole provided in the strength member at the lower part of the packing box 4 or a bolt hole provided in the mount bracket fixed to the lower part of the packing box 4 and tightened together. By doing so, the packing box 4 and the side frames 5 and 6 are detachably fixed via the mount bracket 3.

FIG. 4 is a top view showing a structure in the vicinity of a connection portion between the side frame 6 and the cross member 10 according to the first embodiment of the present invention.

As shown in FIG. 4, the rear wall 29 of the cross member 10 at the rearmost side of the vehicle and the support side wall 31 on the rear side of the vehicle of the mount bracket 3 at the rearmost side of the vehicle substantially coincide with each other in the front-rear position of the vehicle. Further, a shackle 12 which is a support portion of the suspension device 8 is arranged near the rear of the vehicle of the rear wall 29 of the cross member 10 and the support side wall 31 of the mount bracket 3.

Further, the frame member 19 inside the side frame 6 in the vehicle width direction is a vehicle front-rear position (divided portion 38) between the front wall 28 and the rear wall 29 of the cross member 10, and the front frame member 19a and the rear frame member 19b. It is divided into front and back. The frame member 19 is configured by connecting the front frame member 19a and the rear frame member 19b at the split portion 38 by welding.

In the side frame 6, a plurality of (two in this embodiment)

bulkheads

50 and 51 for reinforcing the side frame 6 are provided near the connection portion between the side frame 6 and the cross member 10. The

bulkheads

50 and 51 are arranged apart from each other in the vehicle front-rear direction, which is an extension direction of the side frame 6.

The

bulkheads

50 and 51 are rectangular plank members, and the entire circumference thereof is welded and fixed to the inner wall of the side frame 6. That is, the

bulkheads

50 and 51 have the effect of supporting the inner wall of the side frame 6 and improving the strength and rigidity of the side frame 6.

The bulkhead 50 (second bulkhead) on the rear side of the vehicle is arranged at substantially the same front-rear position of the vehicle as the rear wall 29 of the cross member 10 and the support side wall 31 on the rear side of the vehicle of the mount bracket 3.

On the other hand, the bulkhead 51 (first bulkhead) on the front side of the vehicle is located behind the front wall 28 of the cross member 10, that is, closer to the shackle 12 than the connection position between the front wall 28 of the cross member 10 and the side frame 6. Have been placed.

Although the structure of the side frame 6 on the right side of the vehicle has been described in the above embodiment, the side frame 5 on the left side of the vehicle may be symmetrical and have the same structure.

As described above, in the present embodiment, the two

bulkheads

50 and 51 are provided in the side frame 6 near the connection portion of the cross member 10 at intervals in the front-rear direction of the vehicle. Therefore, the cross member 10 is provided with two

bulkheads

50 and 51. The strength and rigidity of the side frame 6 near the connection portion can be improved. Therefore, even if stress is generated at the connection portion of the side frame 6, deformation of the cross section of the side frame 6 can be suppressed. As a result, the torsional rigidity of the side frame 6 can be improved, and the maneuverability of the vehicle can be improved.

Of the two

bulkheads

50 and 51 provided near the connection between the side frame 6 and the cross member 10, the bulkhead 50 on the rear side of the vehicle has substantially the same front-rear direction as the rear wall 29 of the cross member 10. Since it is arranged at the position, the strength and rigidity of the side frame 6 near the connection portion between the rear wall 29 of the cross member 10 and the side frame 6 can be improved.

Since the bulkhead 50 on the rear side of the vehicle is arranged at substantially the same front-rear position of the vehicle as the support side wall 31 on the rear side of the vehicle of the mount bracket 3, the outer wall of the side frame 6 from the packing box 4 via the mount bracket 3 It is possible to suppress the deformation of the side frame 6 due to the load acting on the 24. Further, since the bulkhead 50 on the rear side of the vehicle, the support side wall 31 on the rear side of the mount bracket 3 and the rear wall 29 of the cross member 10 are arranged so as to be connected in a straight line by the bulkhead 50, the load is loaded. The load acting on the side frame from the box 4 via the mount bracket 3 is distributed to the cross member 10, and the deformation of the side frame 6 can be further suppressed. Further, the load input from the leaf spring 11 of the suspension device 8 via the shackle 12 can also be distributed to the side frame 6 and the cross member 10 by providing the bulkhead 50 on the rear side of the vehicle.

On the other hand, the bulkhead 51 on the front side of the vehicle is arranged behind the front wall 28 of the cross member 10. Here, when the bulkhead 51 on the front side of the vehicle is arranged at the same position as the front wall 28 of the cross member 10 in the vehicle front-rear direction, the side frame 6 near the connection portion between the front wall 28 of the cross member 10 and the side frame 6 is deformed. It can be effectively suppressed. However, since the front wall 28 of the cross member 10 is located farther from the shackle 12 which is the support portion of the suspension device 8 than the rear wall 29, the side frame 6 is twisted by the load repeatedly input from the shackle 12 when the vehicle is running. As a result, the durability of the bulkhead 51, the welded portion thereof, and the side frame 6 near the bulkhead 51 may decrease.

On the other hand, in the present embodiment, of the two

bulkheads

50 and 51 provided near the connection portion of the cross member 10, the front wall 28 of the cross member 10 is the front bulkhead 51 far from the shackle 12. By arranging it so as to be closer to the shackle 12 by locating it further rearward, deformation of the bulkhead 51 and the side frame 6 in the vicinity thereof due to the load input from the shackle 12 is suppressed, and the durability of the side frame 6 including the bulkhead 51 is suppressed. Can be improved.

Further, in the present embodiment, the frame member 19 on the inner side in the vehicle width direction of the side frame 6 near the connection position of the cross member 10 has the division portion 38, but the front bulkhead 51 is positioned rearward and divided. By bringing it closer to the portion 38, it is possible to suppress deformation of the side frame 6 in the vicinity of the split portion 38 due to the load input from the shackle 12, and improve the durability of the split portion 38 and the side frame 6 in the vicinity thereof.

FIG. 5 is a top view showing a structure in the vicinity of a connection portion between the side frame 6 and the cross member 10 according to the second embodiment of the present invention. FIG. 6 is a vertical sectional view showing the shape of the bulkhead 51 according to the second embodiment. FIG. 7 is a view seen from the rear of the vehicle showing the shape of the bulkhead 51 according to the second embodiment. Note that FIG. 6 is a vertical cross-sectional view of the AA portion shown in FIG. FIG. 7 is a vertical cross-sectional view of the BB portion shown in FIG.

As shown in FIGS. 5 to 7, in the side frame 6 according to the second embodiment of the present invention, the shapes of the

bulkheads

50 and 51 are different from those of the first embodiment.

The bulkhead 51 on the front side of the vehicle is a plate-shaped member formed by being divided in the vehicle width direction according to the divided

frame members

19 and 20. That is, the bulkhead 51 includes an inner bulkhead member 51a (first bulkhead member) fixed to the inner frame member 19 in the vehicle width direction and an outer bulkhead member fixed to the outer frame member 20 in the vehicle width direction. It has a two-divided structure composed of 51b (second bulkhead member). The inner bulkhead member 51a is arranged inside the frame member 19 arranged on the connecting side of the cross member 10 among the two

frame members

19 and 20, and the three sides abut against the inner wall surface of the frame member 19 by welding. It is fixed. The outer bulkhead member 51b is arranged inside the frame member 20 arranged on the side opposite to the connecting side of the cross member 10 among the two

frame members

19 and 20, and the three sides hit the inner wall surface of the frame member 20. It is in contact and fixed by welding. The inner bulkhead member 51a and the outer bulkhead member 51b are partially overlapped to form an overlapping portion 53, and are connected to each other by welding at the overlapping portion 53.

Similar to the bulkhead 51 on the front side of the vehicle, the bulkhead 50 on the rear side of the vehicle is also a plate-shaped member formed by being divided in the vehicle width direction according to the divided

frame members

19 and 20. That is, the bulkhead 50 is configured by connecting the inner bulkhead member 50a and the outer bulkhead member 50b.

Further, the inner bulkhead member 51a of the bulkhead 51 on the front side of the vehicle is provided with

flange portions

54, 54 formed by bending the upper end portion and the lower end portion of the plate-shaped member toward the rear side of the vehicle toward the shackle 12, respectively. Has been done. The

flange portions

54, 54 and the upper wall 21 and the lower wall 22 of the side frame 6 are fixed by being overlapped with each other and welded.

The outer bulkhead member 51b of the bulkhead 51 on the front side of the vehicle is not provided with a flange portion 54 because the upper end portion and the lower end portion are not bent, and the upper end portion and the lower end portion are the upper wall 21 of the side frame 6 and the lower end portion. It is fixed to the inner wall surface of the lower wall 22 by butt welding.

As described above, in the second embodiment, the

bulkheads

50 and 51 have a structure divided in the vehicle width direction, similarly to the side frame 6 having a structure divided in the vehicle width direction. Therefore, before the

frame members

19 and 20 are butt-welded to form the side frame 6, the

inner bulkhead members

50a and 51a and the

outer bulkhead members

50b and 51b are previously fixed to the

frame members

19 and 20 by welding, respectively. Can be done. Then, when the

frame members

19 and 20 are butt-welded, for example, the overlapping portion 53 of the

inner bulkhead members

50a and 51a and the

outer bulkhead members

50b and 51b is welded from the holes provided in the

frame members

19 and 20. Therefore, the

bulkheads

50 and 51 can be easily installed.

Further, among the

frame members

19 and 20 of the side frame 6, the frame member 19 inside the vehicle width direction to which the cross member 10 is connected suppresses the twist of the side frame 6 by the cross member 10, so that the frame member 19 is outside in the vehicle width direction. The stress is higher than that of the frame member 20 of the above, and durability is strongly required. Further, as described above, the bulkhead 51 on the front side of the vehicle is also strongly required to have durability against the load from the shackle 12. Therefore, by providing the flange portion 54 on the inner bulkhead member 51a of the bulkhead 51 on the front side of the vehicle, the upper wall 21 and the lower wall 22 of the side frame 6 can be firmly supported and fixed, and the bulkhead can be firmly supported and fixed. The durability of the 51 and the side frame 6 can be effectively improved.

The present invention is not limited to the above embodiment.
For example, in the second embodiment, the flange portion 54 is provided only on the inner bulkhead member 51a of the bulkhead 51 on the front side of the vehicle, but the flange portion 54 is provided on the

other bulkhead members

51b, 50a, 50b. May be good. Further, the flange portions 54 may be provided on the

bulkheads

50 and 51 of the first embodiment.

Further, for example, one of the bulkhead 51 on the front side of the vehicle and the bulkhead 50 on the rear side of the vehicle may have a divided structure as in the second embodiment.

Further, the detailed structures of the side frames 5 and 6, the cross member 10, the

bulkheads

50 and 51, the mount bracket 3, and the like may be appropriately changed.

This application is based on Japanese Patent Application No. 2020-193313 filed on November 20, 2020, the contents of which are incorporated herein by reference.

1 Vehicle 3 Mount bracket 4

Packing box

5, 6 Side frame (frame)
8 Suspension device 10 Cross member 12 Shackle (support)
19, 20 Frame member 50 Bulkhead (second bulkhead)
51 Bulkhead (1st bulkhead)
51a Inner bulkhead member (first bulkhead member)
51b Outer bulkhead member (second bulkhead member)
54 Flange part

Claims

It is composed of a pair of hollow frames extending in the front-rear direction of the vehicle connected by cross members extending in the width direction of the vehicle.
A vehicle frame structure having a support portion of the suspension device of the vehicle at a position separated from the connection portion with the cross member in the extension direction of the frame.
A plurality of bulkheads for reinforcing the inside of the frame at the connection portion with the cross member are provided so as to be separated from each other in the extension direction of the frame.
The frame of the vehicle, wherein the first bulkhead far from the support portion among the plurality of bulkheads is arranged closer to the support portion than the connection position of the cross member member with the frame. structure.
A mount bracket for fixing the packing box provided in the vehicle to the frame is provided.
The claim is characterized in that the mount bracket is arranged at the same position in the extension direction of the frame as a member of the second bulkhead and the cross member, which are close to the support portion among the plurality of bulkheads. The frame structure of the vehicle according to 1.
The frame is formed by fixing two frame members divided in the vehicle width direction.
The bulkhead is a plate-shaped member formed by being divided in the vehicle width direction according to the divided frame member, and is a first bulkhead fixed to the frame member on the connection side with the cross member. It has a member and a second bulkhead member fixed to the frame member on the side opposite to the connection side with the cross member, and a part of the first bulkhead member and the second bulkhead. The frame structure of a vehicle according to claim 1 or 2, wherein a part of the members is overlapped and connected to each other.
In the bulkhead, the upper and lower ends of the plate-shaped member are bent toward the support portion of the suspension device to form a flange portion, and the flange portion and the inner wall of the frame are overlapped and fixed by welding. The frame structure of the vehicle according to claim 1 or 2.
In the bulkhead, the upper and lower ends of the plate-shaped member are bent toward the support portion of the suspension device to form a flange portion, and the flange portion and the inner wall of the frame are overlapped and fixed by welding. The frame structure of the vehicle according to claim 3, which is characterized.
The flange portion is formed on the first bulkhead member and fixed to the frame member, while the second bulkhead member is welded to the inner wall of the frame without bending the upper and lower end portions. The frame structure of the vehicle according to claim 5, wherein the frame structure is fixed.