WO2015193972A1

WO2015193972A1 - Vehicle frame

Info

Publication number: WO2015193972A1
Application number: PCT/JP2014/066058
Authority: WO
Inventors: 武見西川; 俊介佐井
Original assignee: 日産ライトトラック株式会社
Priority date: 2014-06-17
Filing date: 2014-06-17
Publication date: 2015-12-23

Abstract

A vehicle frame has: a left and right pair of side frame members extending in the front-rear direction of the vehicle; and cross members extending in the width direction of the vehicle and connecting the left and right pair of side frame members. Protrusion members protruding outward in the width direction of the vehicle from the outer surfaces of the side frame members are mounted to portions of the outer surfaces of the side frame members, the portions being located in front of front wheels.

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 the front wheel is less likely to enter the cabin.

The vehicle frame has a pair of left and right side frames extending in the front-rear direction of the vehicle, and a plurality of cross members extending in the vehicle width direction and connecting the pair of left and right side frames. In addition, a protruding member that protrudes outwardly from the outer surface of the side frame is attached to a portion of the outer surface of the side frame that is positioned in front of the front wheel.

According to the present invention, the front wheel can be made difficult to enter the cabin.

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 front part structure of the flame | frame of a vehicle. It is the perspective view which looked at an example of the attachment structure of a diagonal member from the upper direction. It is the perspective view which looked at an example of the attachment structure of a diagonal member from the downward direction. It is the perspective view which looked at an example of the attachment structure of a protrusion member from the upper direction. It is the perspective view which looked at an example of the attachment structure of a protrusion member from the downward direction. 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.

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, 142, 144, 146, 148 extending in the vehicle width direction and connecting the pair of left and right side frames 120. 150, 152 and 154. 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 members 140 to 154 of the frame 100 are respectively referred to as a first cross member 140 to an eighth cross member 154 from the front to the rear of the vehicle. Note that the number of cross members 140 to 154 is not limited to eight, but may be any other number.

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 members 140 to 154 are members for suppressing torsion of the frame 100 and parallelogram-like deformation, and also function as attachment portions for various devices mounted on the vehicle. The cross members 140 to 154 are 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 members 140 to 154 are connected to the side frame 120 via brackets fixed to the side frames 120 or brackets fixed to both ends of the cross members 140 to 154, for example. At this time, the side frame 120 and the cross members 140 to 154 are fixed via fasteners such as bolts and nuts, rivets, and welding. Here, in order to increase the connection strength between the side frame 120 and the cross members 140 to 154, reinforcement members such as reinforcement and gusset plates may be attached to the connection locations.

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 120A of the side frame 120 is located behind the widened portion 120A via a pair of left and right first diagonal members 160 that extend obliquely from the front to the rear of the vehicle. It is connected to the middle part of the four cross member 146. Specifically, as shown in FIG. 5, the inner side surface of the side frame 120 has a substantially L shape in a side view, and one side extending in the vertical direction extends over the entire length of the side frame 120 in the height direction. The bracket 128 that extends is fastened. Both ends of a fourth cross member 146 having a flat closed cross section are fastened to the tip of the portion of the bracket 128 that extends inward in the vehicle width. The first diagonal member 160 has a substantially channel-shaped (U-shaped) cross section that opens downward, and its front end 160A is fixed to the lower half of the side frame 120 and its rear end 160B. Is fastened to the upper surface of the fourth cross member 146. Accordingly, the pair of left and right first diagonal members 160 extend obliquely on the horizontal plane so that the distance gradually decreases from the front to the rear of the vehicle.

As shown in FIG. 6, the lower surfaces of the side frame 120, the fourth cross member 146, and the first diagonal member 160 are made of a substantially triangular steel plate whose apexes protrude from the outside of the vehicle width toward the inside. A gusset plate 130 is attached. Accordingly, the first diagonal member 160 has a closed cross-section with the gusset plate 130 closed, and has sufficient strength against torsion, bending, compression, tension, and the like. The first diagonal member 160 itself may have a closed cross section.

The rear end portion of the fourth cross member 146 and the portion located inward of the vehicle width from the connection position of the first cross member 160 extends obliquely from the front to the rear of the vehicle, as shown in FIG. It is connected to the inner surface of the side frame 120 via a pair of left and right second diagonal members 180. Specifically, the bracket 132 is attached to the lower half of the inner side surface of the side frame 120 located behind the fourth cross member 146. The second diagonal member 180 has a flat closed cross section, and its front end 180A is fastened to the lower surface of the fourth cross member 146 and its rear end 180B is fastened to the bracket 132. Therefore, the pair of left and right second diagonal members 180 extend obliquely on the horizontal plane so that the distance gradually increases from the front to the rear of the vehicle. The second diagonal member 180 is preferably located on the same horizontal plane as the first diagonal member 160 in order to improve the strength of the frame 100 and the like.

A plurality of beads extending in the vehicle width direction so as to connect the pair of left and right second diagonal members 180 to the lower surface of the second diagonal member 180 from the front end portion 180A to the substantially central portion thereof. A gusset plate 134 made of a substantially trapezoidal steel plate having unevenness is attached. In addition, a plurality of beads extending in the vehicle width direction are connected to the lower surface of the adjacent side frame 120 on the lower surface of the second diagonal member 180 from the substantially central portion to the rear end portion 180B. A gusset plate 136 made of a substantially triangular steel plate is attached. Therefore, the second diagonal member 180 is connected to the fourth cross member 146 and the side frame 120 via the

gusset plates

134 and 136, and is not easily buckled even if an external force acts in the axial direction, for example.

At the time of a vehicle collision, at least a part of the outer surface of the side frame 120 is positioned between the connecting portion of the first diagonal member 160 with respect to the side frame 120 and the fourth cross member 146 positioned behind the first diagonal member 160. A stopper 300 is attached to suppress the front wheel from entering the cabin. 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. The front surface of the stopper 300 is, for example, a flat slope 300A extending obliquely outward from the vehicle width from the front to the rear of the vehicle in order to slide and rotate the front wheel that is inclined when the vehicle collides. Here, the stopper 300 is integrated with a mounting 138 for fixing the cabin for the purpose of reducing the number of components of the vehicle. The stopper 300 can be separated from the mounting 138.

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 addition, in order to further improve the strength of the stopper 300, a reinforcing member such as reinforcement can 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.

As shown in FIGS. 7 and 8, a protruding member 400 having a substantially triangular shape in a plan view is formed on the outer surface of the side frame 120 and between the first cross member 140 and the second cross member 142. Is attached. The protruding member 400 protrudes outward from the outer side surface of the side frame 120, and the front surface located in front of the vehicle abuts against the object when the vehicle collides. The front surface of the projecting member 400 is, for example, a flat slope 400A that extends obliquely outward from the vehicle front to the rear so that the frame 100 is pushed out by an object that has collided with the vehicle.

The projecting member 400 has, for example, a substantially triangular prism shape having the same height as the side frame 120 that is open only at a portion facing the outer side surface of the side frame 120 in order to ensure the strength that does not greatly deform when the vehicle collides. Made of hollow steel. The protruding member 400 is fixed to a predetermined position on the outer surface of the side frame 120 by welding or the like. Accordingly, the protruding member 400 is fixed to the outer surface of the side frame 120, and thus has a substantially triangular prism shape having a closed space. In addition, in order to further improve the strength of the protruding member 400, a reinforcement member such as a reinforcement can be attached to at least one of the inner surface and the outer surface. For the purpose of reducing the weight, for example, a weight reducing hole can be formed on the lower surface of the protruding member 400.

As with the stopper 300, the protruding member 400 can be shaped and sized so that the object can push the frame 100 in the vehicle width direction when the vehicle collides with the object.

Next, with reference to FIG. 9 to FIG. 12, a description will be given of what process the stopper 300 and the protruding member 400 suppress the intrusion of the front wheel into the cabin when the vehicle collides with the object.

As a premise for explanation, as shown in FIG. 9, it is assumed that the vehicle collides with an object 500 existing on the left side in the traveling direction of the vehicle. When the vehicle collides with the object 500, the object 500 reaches and collides with the front surface of the protruding member 400 located on the left side of the vehicle as shown in FIG. 10 while deforming a bumper, a front fender (not shown), and the like. . At this time, since the front surface of the projecting member 400 is the slope 400A, the frame 100 moves to the right in the vehicle traveling direction using the component force in the vehicle width direction of the impact force that the object 500 collides with the projecting member 400. It moves with being played.

Also, since the front and rear of the widened portion 120A of the side frame 120 are offset in the vehicle width direction, the impact force transmitted from the protruding member 400 to the side frame 120 generates a bending moment in the widened portion 120A. Here, since the fourth cross member 146 located behind the widened portion 120A is connected to the inner surface of the side frame 120 via the first diagonal member 160 and the second diagonal member 180, the widened portion 120A. Is prevented from being deformed. For this reason, the bending moment generated in the widened portion 120A deforms the portion having low rigidity with respect to the bending moment, specifically, the side frame 120 positioned immediately before the widened portion 120A. As the side frame 120 is deformed, the front wheel FW supported by the suspension 200 rotates counterclockwise, and the front surface of the front wheel FW protrudes outward in the vehicle width.

When the object 500 reaches the front wheel FW, the impact force acting on the front wheel FW is transmitted to the upper arm 220 and the lower arm 240 of the suspension 200, for example, the side frames 120 of the

front end portions

220A and 240A located at the rear of the vehicle. Destroy the connection to. At this time, since the front surface of the front wheel FW protrudes outward in the vehicle width, as shown in FIG. 11, the object 500 collides with the inside of the front surface of the front wheel FW and further rotates the front wheel FW. When the suspension 200 is destroyed, the rear surface of the front wheel FW comes into contact with the front surface of the stopper 300, and the impact force acting on the front wheel FW is received by the stopper 300. At this time, since the front surface of the stopper 300 is the inclined surface 300A, the area of contact with the rear surface of the front wheel FW rotated by the deformation of the side frame 120 increases, and the impact force acting on the front wheel FW is firmly received. Can do.

The impact force received by the stopper 300 is passed through the first diagonal member 160, the fourth cross member 146, and the second diagonal member 180, as shown by the hatched arrows in FIG. Dispersed at a plurality of locations on the side frame 120. For this reason, the side frame 120 positioned behind the widened portion 120A is prevented from being greatly deformed. At this time, if the first diagonal member 160 and the second diagonal member 180 are located on the same horizontal plane, the impact force can be efficiently distributed to a plurality of locations on the side frame 120.

When the vehicle further travels, as shown in FIG. 12, the front wheel FW receives an impact force acting from the object 500, slides on the slope 300A of the stopper 300 and further rotates counterclockwise, and moves outside the front wheel FW. The side surface contacts the front surface of the stopper 300. Then, the stopper 300 receives the front wheel FW and the front wheel FW is prevented from entering the cabin. At this time, since the front surface of the stopper 300 is the slope 300A, the frame 100 is further elastically moved to the right in the vehicle traveling direction by the component force in the vehicle width direction of the impact force transmitted from the front wheel FW to the stopper 300. Move to move.

As described above, when the vehicle collides with the object 500 by offset, the frame 100 is moved by the projecting member 400 and the front wheel FW is rotated by the object 500, so that the outer surface of the front wheel FW becomes the stopper 300 during the vehicle collision. It can be made to contact. 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. Even if the front surface of the stopper 300 is not the inclined surface 300A, the frame 100 is moved by the protruding member 400, so that the collision position of the object 500 with the front wheel FW is on the inside, and the front wheel FW can be rotated.

The rotation mechanism of the front wheel FW due to the collision with the object 500 may be caused by deformation of the suspension 200 due to other causes, for example, destruction 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. Further, the fourth cross member 146 may be connected to the inner surface of the side frame 120 only through the first diagonal member 160 as long as the required strength can be ensured.

In the above embodiment, the frame 100 includes both the stopper 300 and the protruding member 400. However, it is sufficient that the frame 100 includes at least the protruding member 400. In this case, when the vehicle collides with the offset, the object 500 collides with the projecting member 400 before colliding with the front wheel FW, so that a part of the impact force is absorbed by the projecting member 400 and the external force acting on the front wheel FW. Is reduced. For this reason, even if the stopper 300 is not attached to the frame 100, the front wheel FW can be made difficult to enter the cabin.

100 frame 120 side frame 138 mounting 140-154 cross member 160 first diagonal member 180 second diagonal member 300 stopper 300A slope 400 projecting member 400A slope FW front wheel

Claims

A pair of left and right side frames extending in the longitudinal direction of the vehicle;
A plurality of cross members extending in the vehicle width direction and connecting the pair of left and right side frames;
In front of the front wheel, a protruding member that protrudes outwardly from the outer surface of the side frame,
A vehicle frame characterized by comprising:
The front surface of the protruding member is a slope extending obliquely from the front to the rear of the vehicle.
The vehicle frame according to claim 1.
At the rear of the front wheel, a stopper that protrudes outward from the outer side surface of the side frame and contacts the front wheel when the vehicle collides,
The vehicle frame according to claim 1, further comprising:
A pair of left and right first diagonal members extending obliquely from the front to the rear of the vehicle so as to narrow the distance and connecting the inner side surface of the side frame and the front end of the cross member positioned behind the front wheel. ,
The vehicle frame according to claim 1, further comprising:
A pair of left and right second diagonal members extending obliquely from the front to the rear of the vehicle so as to increase the distance and connecting the rear end of the cross member positioned behind the front wheel and the inner surface of the side frame The
The vehicle frame according to claim 4, further comprising:
The first diagonal member and the second diagonal member are located on the same plane;
The vehicle frame according to claim 5.
The connection position of the first diagonal member with respect to the cross member is outside the vehicle width from the connection position of the second diagonal member with respect to the cross member.
The vehicle frame according to claim 5.
The front surface of the stopper is a slope extending obliquely from the front to the rear of the vehicle,
The vehicle frame according to claim 3.
The stopper is integrated with a mounting for fixing the cabin,
The vehicle frame according to claim 3.