WO2015087441A1

WO2015087441A1 - Vehicle frame

Info

Publication number: WO2015087441A1
Application number: PCT/JP2013/083466
Authority: WO
Inventors: 正貴竹内
Original assignee: 日産ライトトラック株式会社
Priority date: 2013-12-13
Filing date: 2013-12-13
Publication date: 2015-06-18

Abstract

In a ladder-shaped frame, an extended width portion of a side frame and a center portion of a cross member positioned rearwardly of the extended width portion are linked by a pair of left and right diagonal members extending diagonally from the front to the rear of a vehicle. A stopper against which a front wheel will abut in case of vehicle collision is mounted with at least a part of the stopper positioned between a location on an outer surface of the side frame at which the diagonal members are linked to the side frame and the cross member positioned rearwardly of the location.

Description

Vehicle frame

The present invention relates to a frame of a vehicle such as a truck.

It has been pointed out that when the vehicle has an offset collision, the front wheel enters the cabin and the passenger space becomes narrow. Therefore, as described in Japanese Patent Application Laid-Open No. 11-165651 (Patent Document 1), the front wheel to the cabin is attached by attaching a stopper that abuts against the outer peripheral rear surface of the front wheel in the event of a vehicle collision to the outer surface of the side frame. A technique that suppresses the intrusion of the image has been proposed.

JP-A-11-165651

However, in the technique proposed in Patent Document 1, for example, depending on the deformation of the suspension member that supports the front wheel, the outer peripheral rear surface of the front wheel does not come into contact with the stopper when the vehicle collides, and the front wheel enters the cabin. There was a possibility that it could not be suppressed.

Therefore, an object of the present invention is to provide a vehicle frame in which a front wheel easily comes into contact with a stopper in the event of a vehicle collision.

The vehicle frame includes a pair of left and right side frames having a portion that widens from the front to the rear of the vehicle, and a plurality of cross members that extend in the vehicle width direction and connect the pair of left and right side frames. Further, the widened portion of the side frame and the middle portion of the cross member positioned behind the side frame are connected by a pair of left and right diagonal members extending obliquely from the front to the rear of the vehicle. And when the vehicle collides so that at least a part is located between the connecting portion of the diagonal member with respect to the side frame and the cross member positioned behind the outer side surface of the side frame, An abutting stopper is attached.

According to the present invention, since the outer surface of the front wheel comes into contact with the stopper at the time of a vehicle collision, the effect of the stopper that suppresses the front wheel from entering the cabin can be achieved.

It is a perspective view which shows an example of the flame | frame of a vehicle. It is a top view which shows an example of the flame | frame of a vehicle. It is a perspective view which shows an example of a suspension. It is a top view which shows an example of the attachment position of a diagonal member. It is a cross-sectional view showing an example of a diagonal member. It is explanatory drawing of the 1st process which suppresses the penetration | invasion of the front wheel to a cabin. It is explanatory drawing of the 2nd process which suppresses the penetration | invasion of the front wheel to a cabin. It is explanatory drawing of the 3rd process which suppresses the penetration | invasion of the front wheel to a cabin. It is explanatory drawing of the 4th process which suppresses the penetration | invasion of the front wheel to a cabin. It is explanatory drawing of the 5th process which suppresses the penetration | invasion of the front wheel to a cabin. It is explanatory drawing of the 6th process which suppresses the penetration | invasion of the front wheel to a cabin.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.
1 and 2 show an example of a frame of a vehicle such as a pickup truck.

The frame 100 includes a pair of left and right side frames 120 extending in parallel with the vehicle front-rear direction, and a plurality of cross members 140 (140A to 140I) extending in the vehicle width direction and connecting the pair of left and right side frames 120. . The frame 100 becomes a basic skeleton of the structure of an automobile, and an engine, a power transmission device, a suspension, and the like are attached thereto. Here, the cross member 140 of the frame 100 is referred to as a first cross member 140A to a ninth cross member 140I from the front to the rear of the vehicle. The number of cross members 140 is not limited to nine, but may be other numbers.

The pair of left and right side frames 120 are made of, for example, a steel material having a cross section such as a channel shape with opposed faces open and a box shape forming a closed cross section, and has a widened portion 120A that widens from the front to the rear of the vehicle. Further, the pair of left and right side frames 120 are lowered to facilitate raising and lowering of an occupant to a cabin (not shown), and the vicinity of the axle is bent upward.

The cross member 140 is a member for suppressing torsion of the frame 100 and parallelogram-like deformation, and also functions as a mounting portion for various devices mounted on the vehicle. The cross member 140 is made of a steel material having a cross section such as a channel shape, an angle shape, a hat shape, or a box shape. The cross member 140 is coupled to the side frame 120 via, for example, brackets fixed to the side frame 120 or brackets fixed to both ends of the cross member 140. At this time, the side frame 120 and the cross member 140 are fixed via fasteners such as bolts and nuts, rivets, and welding, for example. Here, in order to increase the connection strength between the side frame 120 and the cross member 140, a reinforcing member such as a reinforcement or a gusset plate may be attached to the connection portion.

A double wishbone suspension (hereinafter abbreviated as “suspension”) 200 as shown in FIG. 3 is provided at a portion located in front of the widened portion 120A of the side frame 120, that is, a portion where the width of the side frame 120 is narrow. Is attached.

The suspension 200 includes an upper arm 220, a lower arm 240, a steering knuckle 260, and a shock absorber 280 to which a coil spring (not shown) is attached concentrically.

The upper arm 220 is made of a steel material having a substantially V shape, and a base end portion 220A of the upper arm 220 extends in the front-rear direction of the vehicle via a bearing, for example, with respect to the bracket 122 fixed to the upper portion of the side frame 120. It is mounted so that it can swing around the axis. The lower arm 240 is made of a steel material having a substantially Y shape, and a base end portion 240A of the lower arm 240 is fixed to the outer surface of the side frame 120 with respect to the pair of brackets 124, for example, via a bearing in the longitudinal direction of the vehicle. It is attached so as to be able to swing around an axis extending to. The steering knuckle 260 is attached between the distal end portion 220B of the upper arm 220 and the distal end portion 240B of the lower arm 240, for example, via a bearing so as to be rotatable around an axis extending in the vertical direction of the vehicle. The shock absorber 280 is attached to a bracket 126 whose upper end 280A is fixed to the outer surface of the side frame 120, while its lower end 280B is attached to an intermediate portion of the lower arm 240. Then, a wheel disc (front wheel) on which a tire is assembled is attached to a knuckle spindle (not shown) of the steering knuckle 260.

As shown in FIG. 4, the intermediate portion of the widened portion 120 </ b> A of the side frame 120 is a fourth cross member located behind the widened portion 120 </ b> A via a pair of left and right diagonal members 160 extending obliquely from the front to the rear of the vehicle. It is connected to the middle part of 140D. Specifically, a bracket 128 for fixing the front end portion of the diagonal member 160 is fastened to the inner side surface of the widened portion 120A of the side frame 120 via, for example, a fastener. In addition, a bracket 130 for fixing the rear end portion of the diagonal member 160 is fastened to an intermediate portion of the fourth cross member 140D via, for example, a fastener. Then, both end portions of the diagonal member 160 are fastened to the

brackets

128 and 130 via, for example, fasteners. Here, the diagonal member 160 is disposed such that its axis extends in the horizontal direction.

As shown in FIG. 5, the diagonal member 160 has a closed cross section in which a hat-shaped first steel material 162 whose bottom surface is open and a channel-shaped second steel material 164 whose top surface is open are joined by welding or the like. . Therefore, the diagonal member 160 has sufficient strength against torsion, bending, compression, tension, and the like. In addition, the diagonal member 160 is good also considering the single steel material which has cross sections, such as a channel shape, an angle shape, a hat shape, a box shape, as a main member, for example.

To the cabin at the time of a vehicle collision, the outer surface of the side frame 120 is located between the connecting portion of the diagonal member 160 with respect to the side frame 120 and the fourth cross member 140D located behind the connecting portion. A stopper 300 that suppresses the intrusion of the front wheel is attached. The stopper 300 protrudes outward of the vehicle width from the outer surface of the side frame 120, and abuts against the front wheel on the front surface located in front of the vehicle. Here, the stopper 300 is integrated with a mounting 180 for fixing the cabin in order to reduce the number of components of the vehicle. Note that the stopper 300 may be separated from the mounting 180.

The stopper 300 is made of, for example, a substantially box-shaped steel material in which only a portion facing the outer side surface of the side frame 120 is opened in order to ensure strength that does not greatly deform when the vehicle collides. The stopper 300 is fixed at a predetermined position on the outer surface of the side frame 120 by welding or the like. Accordingly, the stopper 300 is fixed to the outer side surface of the side frame 120, thereby forming a box shape having a closed space. In order to further improve the strength of the stopper 300, a reinforcement member such as reinforcement may be attached to at least one of the inner surface and the outer surface.

As will be described later, the stopper 300 can have a shape and a size such that a front wheel attached to the side frame 120 via the suspension 200 comes into contact with the vehicle when an offset collision occurs.

Next, with reference to FIG. 6 to FIG. 11, a description will be given of what process the stopper 300 suppresses intrusion of the front wheel into the cabin when the vehicle collides with an object in an offset manner. 6 to 11 show a state in which the frame 100 is viewed from the lower side of the vehicle, the left and right are reversed.

As a precondition for the description, as shown in FIG. 6, it is assumed that the vehicle collides with an object 400 existing on the right side of the traveling direction of the vehicle. When the vehicle collides with the object 400, the object 400 reaches the front wheel FW on the right side of the vehicle and collides as shown in FIG. 7 while deforming the right side surface of the bumper and the cabin (not shown). Then, a collision force in which the object 400 collides with the front wheel FW acts on the side frame 120 having higher strength than the bumper and the cabin via the suspension 200. At this time, if the diagonal member 160 is not present, the front and rear of the widened portion 120A of the side frame 120 are offset, so that a bending moment caused by the collision force acts on the widened portion 120A and greatly deforms it.

However, since the widened portion 120 </ b> A of the side frame 120 is connected to the fourth cross member 140 </ b> D via the diagonal member 160, a part of the collision force that has acted on the side frame 120 passes through the diagonal member 160. It is received by the cross member 140D. For this reason, as shown in FIG. 8, the bending moment acting on the widened portion 120A surrounded by the broken line is reduced, the deformation of the widened portion 120 is suppressed, and the collision force will rotate the front wheel FW in the direction of the arrow. And At this time, since the diagonal member 160 extends in the horizontal direction, the collision force can be efficiently transmitted to the fourth cross member 140D.

The collision force acting on the front wheel FW is transmitted to the upper arm 220 and the lower arm 240 of the suspension 200, and as shown in FIG. 9, the connection of the

tip portions

220A and 240A located at the rear of the vehicle to the side frame 120 is broken. . Then, the object 400 rotates the front wheel FW in the direction of the arrow, with the connecting shaft of the front end portion 220A of the upper arm 220 and the front end portion 240A of the lower arm 240 positioned in front of the vehicle as the rotation center. Accordingly, the rear end of the front wheel FW rotates so as to approach the outer surface of the side frame 120.

When the object 400 further rotates the front wheel FW, the outer peripheral rear surface of the front wheel FW comes into contact with the outer surface of the side frame 120 as shown in FIG. Then, the object 400 moves to the rear of the vehicle while further rotating the front wheel FW with the position where the front wheel FW and the side frame 120 are in contact as the rotation center. And as shown in FIG. 11, the outer surface of the front wheel FW contacts the front surface of the stopper 300, and the front wheel FW is prevented from entering the cabin.

As described above, the deformation of the widened portion 120A of the side frame 120 is suppressed by the diagonal member 160. Therefore, the outer surface of the front wheel FW is brought into contact with the stopper 300 using the collision force with which the front wheel FW collides with the object 400. Can be touched. For this reason, the front wheel FW easily comes into contact with the stopper 300 at the time of a vehicle collision, and the effect of the stopper 300 can be achieved.

Note that the rotation mechanism of the front wheel FW due to the collision with the object 400 may be caused by the deformation of the suspension 200 due to other causes, for example, the breakage of the

brackets

122 and 124 fixed to the side frame 120.

Further, the suspension 200 that supports the front wheel FW is not limited to the double wishbone type suspension, but may be a known suspension such as a strut suspension.

100 frame 120 side frame 120A widened portion 140 (140A to 140I) cross member 160 diagonal member 180 mounting 200 suspension 300 stopper 300 FW front wheel

Claims

A pair of left and right side frames having a portion that widens from the front to the rear of the vehicle;
A plurality of cross members extending in the vehicle width direction and connecting the pair of left and right side frames;
A pair of left and right diagonal members that extend obliquely from the front to the rear of the vehicle and connect the widened portion of the side frame and the intermediate portion of the cross member positioned behind the side frame;
When the vehicle collides with the outer surface of the side frame, which is attached so that at least a part is located between the connecting portion of the diagonal member with respect to the side frame and the cross member positioned behind the diagonal member. A stopper that comes into contact with the front wheel,
A vehicle frame characterized by comprising:
The stopper is integrated with a mounting for fixing the cabin,
The vehicle frame according to claim 1.
The diagonal member extends in a horizontal direction.
The vehicle frame according to claim 1, wherein the vehicle frame is a vehicle frame.
The diagonal member has a closed cross-section,
The vehicle frame according to any one of claims 1 to 3, wherein: