JP3400567B2 - Front structure of car body - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front structure of a vehicle body, and more particularly to a front structure of a vehicle body having a tie down plate.

[0002]

2. Description of the Related Art In recent years, a vehicle body structure of an automobile has been developed which absorbs collision energy due to deformation of a front portion and a rear portion of a vehicle body during a collision and suppresses deformation of a passenger compartment to ensure passenger safety.

A vehicle body structure for this purpose is, for example, Japanese Unexamined Patent Publication No.
As disclosed in Japanese Laid-Open Patent Publication No. 139242 and showing a cross section of a main part in FIG. 4, a first closed cross-section structure part a located at the front part,
The crash frame A, which is located at the rear of the first closed cross-section structure part a and has a second closed cross-section structure part b having a larger cross-sectional area than the first closed cross-section structure part a, is a front side frame B. Installed at the front end of this crash frame A
The front structure of the vehicle body has been proposed which suppresses or reduces the deformation of the front side frame B by absorbing the collision energy acting from the front of the vehicle body by the deformation of the vehicle body to suppress the deformation of the vehicle interior.

On the other hand, at the front end of the front side frame of the vehicle body, a tie-down plate is attached for fixing the vehicle body when the vehicle is loaded on a ship or a land trailer and transported. 28773). Although this tie-down plate generally secures the strength as a fixing hook during transportation of the vehicle body,
If this tie-down plate is accidentally used for towing, a larger load is applied, so it is necessary to secure a large strength.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the vehicle body structure disclosed in Japanese Patent No. 242, since the crash frame is provided at the front end of the front side frame, the collision energy acting from the front of the vehicle body due to the deformation of the crash frame at the time of a collision is absorbed, so that a predetermined value is obtained. When the collision energy is small, it is possible to absorb the collision energy by the deformation of the front side frame and suppress the deformation of the vehicle interior, thereby ensuring the vehicle interior space for the safety of the occupant. However, the mounting portion of the tie-down plate, which is used for fixing when transporting an automobile, has extremely high strength, and in the vicinity of the crash frame, which is required to be efficiently crushed in order to absorb collision energy in the event of a collision. Since it is located at the front end of the front side frame, it may impede sufficient deformation of the crash frame or the front side frame and may not be able to reliably absorb the collision energy.

Therefore, an object of the present invention is to ensure the absorption of the collision energy in the front part of the vehicle body to suppress the deformation of the passenger compartment to ensure the safety of passengers and to improve the strength of the tie-down plate mounting part. To provide the front structure of the.

[0007]

In order to achieve the above object, the front structure of a vehicle body according to the present invention is a vehicle front and rear body formed by connecting upper flanges and lower flanges of front side and close plates to each other. Extends in the direction
A front side frame of the closed section, the upper frame of the closed section of the vicinity of the front end of the front side frame to form bent so as to face each other close to the vertical direction central portion of the front end near the front side and closed plates Each plate upper mounting portion that is partitioned into the lower frame of the closed cross-sectional shape, and the upper end is fitted between the plate upper mounting portions of the front side and the close plate, and the central portion is the front side and the close play. Inserted between the lower flanges of the
A tie down plate projecting from the lower frame downward both lower the vertical to partitioning, and crash frame for front mounting support a bumper back beam is provided to extend to the front of the vehicle body on the upper frame, the lower flame
And a radiator lower support frame provided at the front end.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the front structure of an automobile body according to the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing the main part of the front part of the main body,
2 is a side view of a main part, and FIG. 3 is a sectional view taken along the line AA in FIG.

In the drawings, reference numeral 1 is a front side frame having a closed sectional structure extending in the vehicle front-rear direction in the vicinity of the lower portions of both ends in the vehicle width direction in the front portion of the vehicle body.

[0011] The front side frame 1 is divided into bifurcated forward, upward has a frame side 2 and closed plate 3 that extends from below, each of the upper flange 2a and 3a and the lower flange 2b and 3b A bead having a closed cross-sectional shape that extends in the vehicle front-rear direction by welding and joining to each other and gradually expands downward as it moves to the front of the vehicle, and the upper and lower central portions of the frame side 2 and the close plate 3 are close to each other near the front end. Plate-shaped upper side mounting portions 2c and 3c, the front side frame 1 is vertically divided by the plate upper side mounting portions 2c and 3c adjacent to each other to form an upper frame 1A and a lower frame 1B. .

[0012] upper side frame 1A is respectively welded to the frame side 2 and closed plates 3 of each of the upper flange 2a and 3a, the plate upper attachment portion 2c, the central flange 2d and 3d provided continuously to 3c The crush frame mounting flanges 2e and 3e are formed in a closed cross-section with a substantially rectangular cross section and extend forward of the vehicle body.

On the other hand, the lower frame 1B is a frame frame.
Plate 2 upper side mounting portion 2 of the closed plate 3
c, 3c are continuously formed to have a substantially rectangular cross-section.
At the lower end of the lower frame 1B, the lower flange 2
b, 3b, support frame mounting flanges 2 which are formed continuously from b and 3b, and which are fitted and supported by tie-down plates 5 which will be described later, and which are bent in the vehicle body width direction at their front ends.
g, 3 g are formed. The mounting holes 2 are formed in the plate upper mounting portions 2c, 3c and the lower flanges 2b, 3b.
f and 3f are bored, and a nut 4a corresponding to the mounting hole 2f is welded.

The tie-down plate 5 is plate-shaped,
A locking hole 5a is opened in the lower part of the frame side 2
And the plate upper side mounting portions 2c, 3 of the close plate 3
c and the mounting holes 2 formed in the lower flanges 2b, 3b
f and 3f are provided with corresponding mounting holes 5b, and the inside of the lower frame 1B is vertically cut through a gap between the lower flanges 2b and 3b facing each other from below, and the lower frame 1B of this closed cross-sectional shape is formed.
The front side frame 1 is fitted to the front side frame 1 by inserting the bolts 4b into the respective mounting holes 3f, 5b, 2f and screwing the bolts 4b into the nuts 4a. Install.

A crash frame 6 having a substantially rectangular cross section is fixed to the front end of the front side frame 1. The crash frame 6 has a base portion 6a having a substantially rectangular closed cross-section that penetrates in the front-rear direction of the vehicle body. The crash frame 6 is inserted from the front end of the upper frame 1A into the upper portion of the rear end of the vehicle body of the base portion 6a. The rear end upper flange 6b that abuts against the wall from the lower side to perform a relative positioning function with the front side frame 1 in the vehicle width direction and the up and down direction, and is bent in the vehicle body width direction to contact the crash frame mounting flanges 2e and 3e. It has a rear end side flange 6c which is in contact with and welded or bolted. On the other hand, a bumper mounting flange 6d is formed on each of the upper portion and the side portion of the vehicle body front end of the base portion 6a. ing.

The back beam 7 has a substantially hat-shaped cross-section, and has a locking piece 7a formed on the lower end edge of the back beam 7.
The base plate 6a is mounted and locked on the lower wall surface of the base portion 6a for relative positioning in the vertical direction and the vehicle body width direction.
The bolts 8a are inserted from the mounting holes 7b which are opened to the lower edge and the upper edge, and the mounting holes 6e which are opened to the bumper mounting flange 6d of the crash frame 6 are penetrated, and the back beam 7 is screwed into the nuts so that the back beam 7 is secured. The left and right front side frames 1 are laterally mounted via the left and right crash frames 6 and attached. Further, a shock absorber is interposed on the front surface of the back beam 7 and a bumper face (not shown) is applied to form a bumper.

Support frame mounting flanges 2g and 3g bent in the vehicle width direction are formed at the front end of the lower frame 1B formed on the front side frame 1, and these support frame mounting flanges 2g and 3g are formed.
Then, the radiator lower support frames 9 are laterally mounted between the left and right lower frames 1B by welding and attaching the mounting flanges 9a formed at both ends of the radiator lower support frame 9.

According to the front structure of an automobile body according to the present embodiment having such a configuration, it defines a front portion of the front side frame 1 to the upper side frame 1A of the closed section and the lower frame 1B, below The lower radiator support frame 9 is fixed to the front end of the side frame 1B, and the upper frame 1A
Is forwardly projected from the lower frame 1B to fix the crash frame 6 and the bumper back beam 7 is provided at the front end of the crash frame 6. Therefore, at the time of collision, the back beam 7 and the crash frame 6 provided on the upper frame 1A are first provided. crushed by absorbing the collision energy, followed by absorbing the collision energy by crushing of the lower frame 1B, as shown in FIG. 4, a decrease in subsequent drag B compared with the initial drag a is suppressed as a whole Energy absorption characteristics close to a gentle rectangular shape with less drag reduction are obtained, and the tie-down plate 5 has a lower frame 1 with a closed cross-sectional shape.
In the provision so as to partition longitudinally across the B, located a substantially Thailand Dan plate 5 to crush the central axis of the lower full <br/> frame 1B, the lower frame by the rear end of the tie-down plate 5 < Since the lower frame 1B moves rearward along the central axis of the lower frame 1B while crushing the chamber 1B, energy is absorbed without bending in the lower frame 1B, which is effective for collision energy. Absorption can be secured.

Further, since the tie-down plate 5 divides the inside of the lower frame 1B and is bridged between the plate upper-side mounting portions 2c and 3c and the lower flanges 2b and 3b, the tie-down plate 5 is mounted. It becomes possible to secure a sufficient space p, and the tie-down plate 5
Is firmly attached, and sufficient strength of the tie-down plate 5 can be secured.

[0020]

According to the front structure of the automobile body according to the present invention described above, at the time of a collision, the collision energy is first absorbed by the crushing of the crash frame provided on the upper frame, and then the collision energy is absorbed by the crushing of the lower frame. Since it absorbs, the decrease of the drag force can be suppressed and the bending of the lower frame can be avoided, so that the efficient collision energy absorption can be reliably achieved and the deformation of the vehicle interior can be suppressed. Occupant safety is ensured, and the tie-down plate is installed by partitioning the lower frame and straddling the hook upper mounting part and the lower flange interval, so that the tie-down plate mounting pitch is sufficient. It has the effects peculiar to the present invention, such as securing it and strengthening the attachment of the tie-down plate.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts for explaining an embodiment of a vehicle body front structure of the present invention.

FIG. 2 is likewise a side view of an essential part of the present embodiment.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a diagram showing a collision energy absorption characteristic in the present embodiment.

FIG. 5 is an explanatory view showing an embodiment of a conventional vehicle body front structure.

[Explanation of symbols]

1 ... front side frame 1A ... upper frame 1B ... lower frame 2 ‥‥‥‥‥ Front side 2a ... upper flange 2b ... lower flange 2c ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 3 ... Close plate 3a ... upper flange 3b ... lower flange 3c ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 5: Tie down plate 6 ‥‥‥‥‥ Crash Frame 7 ... Back beam 9 ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) B62D 21/15 B60D 1/04 B60R 19/48 B62D 25/08

Claims (3)

(57) [Claims] 1. The front side and the close plate are connected to each other between upper flanges and lower flanges of each other.
The formed front side frame extending in the front-rear direction of the vehicle body and having a closed cross-sectional shape, and the front end of the front side frame formed by bending the front side frame and the front plate and the close plate in the vicinity of the front end in the vertical direction so as to face each other. Each plate upper mounting part that divides the vicinity into an upper frame having a closed cross section and a lower frame having a closed cross section, and an upper end inserted between the plate upper mounting parts of the front side and the close plate and having a center The parts are fitted between the lower flanges of the front side and the close plate and are bolted to each other so as to vertically cut through the lower frame.
A tie down plate together lower the partitioning is protruded from the lower frame downward and crash frame for front mounting support to be in <br/> bumper back beam provided to extend to the front of the vehicle body on the upper frame, the lower A front structure of an automobile body, comprising: a radiator lower support frame provided at a front end of the frame . 2. The front structure of an automobile body according to claim 1, wherein the front end of the upper frame is located in front of the front end of the lower frame. 3. The front part of the front side frame gradually expands downward as it moves forward, and is divided into an upper frame and a lower frame by plate upper mounting parts formed on the front side and the close plate near the front end. The front structure of the automobile body according to claim 1 or 2.