JPH035175Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a frame structure of an automobile, particularly to a reinforcing structure for front side frames provided on both sides of an engine room.

(Prior Art) In general, in the body structure of an automobile, bumpers are provided at the front and rear of the vehicle in order to ensure safety in the event of a collision.This absorbs the impact energy in the event of a collision, and protects the occupants and the vehicle. It is designed to protect the main body. However, in the case of a severe collision, the bumper alone cannot sufficiently absorb the collision energy, and the frame structure that makes up the engine room located at the front of the vehicle is compressed and deformed, causing an even greater impact force. When this happens, the engine and other structures installed in the engine room move toward the rear of the vehicle due to the compressive deformation of the frame structure, which may deform the front of the passenger compartment, making it difficult to protect the safety of the occupants. This is insufficient in terms of implementation, and some kind of countermeasure is desired.

(Purpose of the invention) The present invention was developed in view of the above circumstances, and even if the front part of the vehicle receives an impact force due to a collision and the frame structure that makes up the engine compartment is deformed, This deformation is used to move the engine, etc. downward, thereby securing crash space, thereby minimizing the impact of impact on the passenger compartment and protecting the safety of the occupants. The purpose is to provide a frame structure for

(Structure of the invention) The frame structure of an automobile according to the invention is formed in a closed cross section, and is disposed on both sides of the engine compartment so as to extend in the front-rear direction, and has a part inclined downward toward the front of the vehicle. A pair of reinforcing members are fixed to a pair of front side frames each having a section, and the reinforcing members extend along the frame from a middle part of the inclined part of the frame toward the rear of the vehicle through a bent part. The reinforcing member extends along the bending portion, and has a substantially L-shaped cross-sectional shape, and a corner portion of the L-shape is located above the inner side of the frame in the vehicle width direction. be.

Therefore, the cross-sectional shape of the reinforcing member at a portion other than the bent portion is not limited to a substantially L-shape, and if the bent portion is also substantially L-shaped, for example, flanges may be attached to both ends thereof, or ,
It can also have a corrugated plate shape. That is, in short, the cross-sectional shape may be such that when the front side frame receives an impact force from the front, a force acting on the frame to bend the frame downward at the bent portion is applied.

Moreover, this reinforcing member may be attached to the inside of the closed section or to the outside as long as it extends along the frame and is fixed thereto.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing the frame structure of an automobile according to this embodiment.

A front side frame 1 is provided slightly below both sides of an engine compartment 2 disposed at the front of a vehicle. The frame 1 is formed to have a closed cross section, extends in the vehicle longitudinal direction within the engine room 2, and has a front portion divided into upper and lower halves. The frame 1a located on the upper side extends straight forward and is connected to a bumper 3 mounting bracket (not shown), while the frame 1b located on the lower side has an inclined portion 4 inclined toward the front. Once lowered, it extends parallel to the frame 1a toward the front of the vehicle, and is connected to a front frame 5 provided extending in the vehicle width direction.

A subframe 6 extending in the vehicle width direction is attached to the lower surface of the lower end of the inclined portion 4 of the frame 1b, and furthermore, a subframe 6 extending in the vehicle longitudinal direction is attached to the lower surface of the subframe 6, and its front end is connected to the front frame 5. A connected subframe 7 is attached. The front part of the engine 9 is attached to the subframe 6, the space occupied by the engine 9 being indicated by the two-dot chain line in the figure.

At the part where the front side frame 1 is divided into two parts, that is, the bent part 8 at the upper end of the inclined part 4 of the frame 1b, at a position slightly toward the rear of the vehicle,
An engine mount bracket 10 supporting an engine 9 has its upper end welded to the upper part of a wheel apron 11, and its lower end welded to the upper surface of the front side frame 1.

In this way, the engine 9 has a four-point support structure in which the front part is supported by the subframe 6, the both sides are supported by the engine mount brackets 10, and the rear extension part is supported by a mount member (not shown). .

Inside the closed section of the front side frame 1,
A reinforcing member 12 extends along the longitudinal direction of the frame 1 from near the lower end of the inclined portion 4 of the frame 1b through the bent portion 8 to the rear end inside the engine room 2. The cross-sectional shape of the reinforcing member 12 is the bending part 8
The vicinity and rear end portions are L-shaped with corner portions 13 on the inside and upper side in the vehicle width direction, but beads 14 are additionally formed in other portions to increase rigidity, and the bent portion 8 and its The shape of the bead 14 is formed to gradually change between both side portions.

FIG. 2 is a sectional view taken along the line -- in FIG. 1.

The front side frame 1 consists of a flat plate-shaped side frame outer 15 welded to the lower end of the wheel apron 11, and a U-shaped side frame inner 16 with flanges at both ends welded to the outer 15. 15 and the inner 16 form a closed cross section. A reinforcing member 12 having an L-shaped cross section and a bead 14 formed thereon
are welded to the upper and side inner surfaces of the inner 16 within the closed section.

A pair of flanges 17 of the engine mount bracket 10 are each provided with a hole 18, and an engine mount 19 for supporting the engine 9 is attached thereto. Also, bracket 10
The welding position of the upper end to the wheel apron 11 is as follows:
In order to firmly support the bracket 10, an upper frame 20 having a closed cross section and extending in the longitudinal direction of the vehicle is welded to the back surface of the apron 11.

FIG. 3 is a sectional view taken along the line - in FIG.
Front wheel suspension and front side frame 1
Indicates the relationship between

The upper end of a coil spring 22 of the suspension is attached to a flat part 21 extending inward in the vehicle width direction from the upper frame 20, and the inner end of the flat part 21 in the vehicle width direction is bent downward. It is connected to a vertical portion 23 welded to the front side frame 1.

Next, the effect will be explained.

In FIG. 1, when a vehicle collides and receives an impact on its front part, the impact energy is transmitted to the two-pronged frame 1a and frame 1b of the front side frame 1 via the bumper 3 and front frame 5. Ru. At this time, an L-shaped reinforcing member 12 is welded to the frame 1 within the closed cross section of the frame 1 with its corner portion 13 located on the inner side and upper side in the vehicle width direction, so that impact energy is applied to the frame 1. A force that bends the frame 1 downward is applied to the frame 1. This force is concentrated on the part of the reinforcing member 12 where the cross-sectional shape is L-shaped and does not include the bead 14, that is, the bent part 8 of the reinforcing member 12, so that the force is applied to the frame 1. It acts as a force that bends the front portion of the bent portion 8 downward. As a result, the frame 1 at the lower end of the inclined portion 4 of the frame 1
A subframe 6 connected to the lower surface of the engine and extending in the vehicle width direction moves downward, and an engine 9 whose front portion is supported by this subframe 6 also moves downward.

In this way, even if the front of the vehicle is deformed due to a collision, the deformation is not spread to the rear of the vehicle where the passenger compartment is located, and is converted into an action that moves the engine downward. This makes it possible to secure crash space.

On the other hand, the reinforcing member 12 is welded to the frame 1 so as to extend within the closed cross section of the front side frame 1 from near the lower end of the inclined portion 4 toward the rear of the vehicle within the engine room 2. As shown in the figure, the engine mount bracket 10
The vibrations and shocks caused by the rotation of the engine 9 are transmitted to the frame 1 through the flat part 21 and the vertical part 23, as shown in FIG.
The input from the suspension that is transmitted to the frame 1 is distributed over the entire frame 1, so that a high load is not applied locally.

(Effects of the invention) As described in detail above, according to the invention, the frame structure of an automobile is formed in a closed cross section, extends in the longitudinal direction of the vehicle, is disposed on both sides of the engine compartment, and has a portion in front of the vehicle. A pair of front side frames each having an inclined portion that slopes downward towards the front side frame.
A pair of reinforcing members are fixed to each other, the reinforcing member extending along the frame from the middle part of the inclined part of the frame to the rear of the vehicle through the bent part, and the reinforcing member at the bent part Since the cross-sectional shape of the member is approximately L-shaped, and the corner of the L-shape is located above the inner side of the frame in the vehicle width direction, the front part of the vehicle receives an impact force in the event of a collision, causing the engine room to be damaged. Even if the constituent frame structure is deformed, this deformation causes the engine etc. to move downwards, thereby securing crash space and minimizing the impact of impact on the passenger compartment. It is possible to protect the safety of the occupants.
Furthermore, vibrations and other inputs transmitted to the front side frame from the engine and suspension can be dispersed throughout the frame by means of reinforcing members fixed along the frame, so that vibrations and other inputs transmitted to the front side frame are localized to the front side frame. This can prevent heavy loads from being applied.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the frame structure of an automobile according to the present invention, Fig. 2 is a sectional view taken along the line - - of Fig. 1,
FIG. 3 is a sectional view taken along the line -- in FIG. 1. 1... Front side frame, 2... Engine room, 4... Inclined part, 8... Bent part, 12
... Reinforcement member, 13 ... Corner.

Claims (1)

[Claims for Utility Model Registration] A pair of wires formed in a closed cross section, extending in the longitudinal direction of a vehicle, disposed on both sides of the engine compartment, and having a portion that slopes downward toward the front of the vehicle. a front side frame, extending along the frame from an intermediate portion of the inclined portion of the pair of frames toward the rear of the vehicle via a bent portion;
A pair of reinforcing members are respectively fixed to the frame, and each of the reinforcing members has a substantially L-shaped cross-sectional shape at the bent portion, and a corner of the L-shape is located above the inner side of the frame in the vehicle width direction. An automobile frame structure characterized by being located at.