JP2842107B2 - Vehicle bumper mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle bumper mounting structure.

[0002]

2. Description of the Related Art As a mounting structure of a vehicle bumper, for example, there is one shown in FIGS.

In the mounting structure shown in FIGS. 6 and 7, a bumper stay 2 is attached to the front end of a front side member 1 from the front-rear direction, and the front end of the bumper stay 2 has a U-shaped cross section so as to sandwich the bumper stay 2. A resin bumper 3 is set, and the bumper 3 is fixed by pin connection with bolts 4 inserted from above and below.

On the other hand, in the mounting structure shown in FIGS. 8 and 9, the bumper stay 2 is fixed to the front end of the front side member 1 by bolts 4 which are inserted from above and below. The bumper 3 is fixed.

[0005] In the former mounting structure, the front side member 1 and the bumper stay 2 are mounted. In the latter mounting structure, the bumper stay 2 and the bumper 3 are mounted in the front-rear direction, respectively. Is secured. Further, in the former mounting structure, the bumper stay 2 and the bumper 3 are mounted, and in the latter mounting structure, the front side member 1 and the bumper stay 2 are mounted by the bolts 4 inserted in the vertical direction. Even if a load is applied to the front side member 3 from an oblique direction, the bumper 3 rotates around the bolt 4 to prevent the front side member 1 from being bent, and the front side member 1 can be smoothly seated. (This similar structure is disclosed in, for example, Japanese Utility Model Laid-Open Publication No. Sho 61-3052 or
This is disclosed in Japanese Utility Model Laid-Open Publication No. 61-117755 ).

[0006]

However, in the above-mentioned conventional vehicle bumper mounting structure, as shown in FIG. 10 as a structural model diagram, a bumper 3, a bumper stay 2, and a front side member 1 are connected in series. Because of the connection, an impact load is always input to the bumper stay 2 at the time of a vehicle frontal collision. Therefore, if the reaction force of the bumper stay 2 is low, the bumper stay 2 is damaged even during a light collision (about 8 km / h), and there is a problem that the repair cost increases.

On the other hand, if the reaction force of the bumper stay 2 is increased so as not to damage the bumper stay 2 at the time of a light collision, the reaction force of the bumper stay 2 becomes higher at the time of a collision at about 15 km / h (during damage). Therefore, there is a problem that damage to the front side member 1 is increased.

Accordingly, the present invention provides a mounting structure for a vehicle bumper capable of securing an amount of shock absorption according to a collision speed.

[0009]

The distal end portion of the side members Means for Solving the Problems] In the mounting structure of a vehicle bumper fitted with a bumper through the bumper stay, the front bumper stay and rear bumper stay is divided into two a bumper stay back and forth with <br/> constitutes a mounting flange formed respectively on bi towards the front bumper stearyl Lee and rear bumper stay, these
Make the front bumper stay and the rear bumper
While connecting together Pasutei one from the back surface of the bumper
Extend the pair of mounting ribs so as to straddle the front bump pasty
To the front and rear bumper stay mounting flanges.
Binding to, form a gap between the settings to bumper and front Banpasutei longer than the front bumper stay the length of the mounting ribs
Characterized in that the formation was.

[0010]

[Function] The length of the mounting rib is made longer than the front bumper stay to form a gap between the rear surface of the bumper and the front end of the front bumper stay, so that the deformation of the bumper at the time of a light collision reaches the front bumper stay. Not to be possible.

In a normal collision in which the amount of displacement of the bumper is large, the rear surface of the bumper abuts against the front bumper stay, and the mounting rib presses the rear bumper stay to absorb the impact by the front bumper stay and the rear bumper stay. I do.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a bumper stay 6 is provided at the tip of a front side member 5 as a side member.
, A resin bumper 7 is attached.

The bumper stay 6 is divided into two parts at the front and rear, and comprises a front bumper stay 8 and a rear bumper stay 13. As shown in FIG. 2, the front bumper stay 8 is a member formed by joining an upper panel 9 having a U-shaped cross section and a lower panel 10 by arc welding or the like to form a closed cross-sectional structure. Inner flange part 1 facing the back
1 and a mounting flange 1 at the rear end extending in the vehicle width direction.
2 is provided.

On the other hand, the rear bumper stay 13 is also formed by joining an upper panel 14 and a lower panel 15 having a U-shaped cross section by arc welding or the like to form a closed cross-sectional structure, and has a front end corresponding to the mounting flange 12. Mounting flange 16
The rear end has an upper panel 14 and a lower panel 15
Are formed through holes 18 for bolts 17 penetrating vertically.

Here, as shown in FIG. 2, an insertion hole 21 for a bolt 20 to be described later is formed vertically at a joint 19 between the mounting flange 16 of the rear bumper stay 13 and the mounting flange 12 of the front bumper stay 8. It is.

As shown in FIG. 1, a pair of resin-made mounting ribs 22 which abut the mounting flange 12 of the front bumper stay 8 are formed integrally with the bumper 7 at positions sandwiching the front bumper stay 8 in the vehicle width direction. It is. The mounting rib 22 has a bolt 20 at the tip corresponding to the insertion hole 21 of the joint 19 between the mounting flanges 12 and 16. Further, the length of the mounting rib 22 is larger than the length of the front bumper stay 8, so that a gap C is formed between the rear surface of the bumper 7 and the front end of the front bumper stay 8 during mounting. ing.

Then, a bolt 17 is inserted into an insertion hole 18 at the rear end of the rear bumper stay 13 formed as described above, and the rear bumper stay 13 is fixed to the front side member 5 by pin connection. Stay 13
Mounting flanges 12 and 16 for the front bumper stay 8 and
The bolt 20 of the mounting rib 22 is inserted into the insertion hole 21 of the joint 19
, And the mounting flanges 12 and 16 are fastened with the nut 23.

A comparison of the reaction force between the bumper 7, the front bumper stay 8, the rear bumper stay 13, and the front side member 5 shows that the bumper 7 ≒ the front bumper stay 8≪the rear bumper stay 13 <the front side member. It is 5.

A gap C provided between the front end of the front bumper stay 8 and the rear surface of the bumper 7 has the rear surface of the bumper 7 displaced during a light collision (collision speed about 8 km / h). 8 is set to a value that does not touch.

Then, with the bumper 7 assembled,
The front bumper stay 8 is set to have such strength and rigidity that it starts to deform when the collision speed is about 15 km / h (at the time of damage), and the rear bumper stay 13 has a collision speed of about 50 km / h.
The strength and rigidity are set so that the deformation starts at the time of h (at the time of high-speed collision).

Next, the operation of the bumper 7, the front bumper stay 8, the rear bumper stay 13, and the front side member 5 will be described with reference to FIGS.

First, in the assembled state of the bumper 7, a gap C is formed between the front end of the front bumper stay 8 and the rear surface of the bumper 7, as shown in FIG. And the front bumper stays 8 are provided in parallel, and the rear bumper stays 8 are arranged in series.

At the time of a light collision, the bumper 7 is displaced rearward as shown in FIG. 4, but the displacement is smaller than the gap C, so that it does not interfere with the front bumper stay 8, and the front bumper stay 8 is displaced. I can't. The impact force at this time is absorbed by the bumper 7 and the rear bumper stay 13. Therefore, it is not necessary to replace or repair parts which have been performed every time a light collision occurs.

Next, since the displacement of the rear surface of the bumper 7 is larger than the gap C at the time of damage and at the time of a high-speed collision, the rear surface of the bumper 7 abuts against the front end of the front bumper stay 8, and FIG. As shown in FIG. 7, the front bumper stay 8 receives the impact force in parallel with the bumper 7, and the rear bumper stay 13 in series with the front bumper stay 8 absorbs the impact force.

At the time of damage at a low collision speed, the front bumper stay 8 is crushed and absorbs it, so that repairs can be dealt with by replacing only the front bumper stay 8. Also, at the time of high-speed collision where the collision speed is high,
Both the front bumper stay 8 and the rear bumper stay 13 may possibly also collapse the front side member 5 to absorb the impact force. Arrows in FIGS. 4 and 5 indicate the state of force transmission.

When a nut plate 24 having an L-shaped cross section is attached to the rear surface of the joint 19, specifically, to the rear surface of the mounting flange 16 of the rear bumper stay 13, as indicated by a chain line in FIG. The joint 19 can be reinforced, so that when an impact force acts, the joint 1
9 can be prevented from being deformed and the impact force being not sufficiently transmitted to the rear bumper stay 13.

[0028]

As described above, according to the present invention, since the length of the mounting rib is longer than that of the front bumper stay, a gap is formed between the rear surface of the bumper and the front end of the front bumper stay. Therefore, by setting the mounting rib to a certain length, it is possible to prevent the bumper from interfering with the front bumper stay in the case of a light collision in which the displacement of the bumper is small. This makes it possible to prevent deformation of the front bumper stay during a light collision.

Also, since the bumper stay is divided into a front bumper stay and a rear bumper stay, the front bumper stay is made more fragile than the rear bumper stay. Can be set, and the impact force can be absorbed by the members arranged according to the collision speed, including the case of the light collision.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view of an embodiment of the present invention.

FIG. 2 is a perspective view of a bumper stay.

FIG. 3 is a structural model diagram schematically illustrating each member.

FIG. 4 is an explanatory view at the time of a light collision in FIG. 3;

FIG. 5 is an explanatory diagram at the time of a high-speed collision in FIG. 3;

FIG. 6 is an explanatory side view of the prior art.

FIG. 7 is an explanatory plan view of FIG. 6;

FIG. 8 is an explanatory side view of another conventional technique.

FIG. 9 is an explanatory plan view of FIG. 8;

FIG. 10 is an explanatory view schematically showing each member of the related art.

[Explanation of symbols]

 5 Freud side member (side member) 6 Bumper stay 7 Bumper 8 Front bumper stay 12 Mounting flange 13 Rear bumper stay 16 Mounting flange 19 Joining part 22 Mounting rib

Claims (1)

(57) [Claims] 1. A mounting structure of a side member for a vehicle bumper fitted with a bumper through the bumper stay to the distal end of the configuration Then together the front bumper stay and rear bumper stay is divided into two a bumper stay back and forth
To the mounting flange is formed respectively on the bi-direction of the front bumper stearyl Lee and rear bumper stay, these mounting flanges
Abut the front bump pasty and the rear bump pasty
While connected to the pair of mounting ribs from the back surface of the bumper
Extend it across the front bump pasty and
Connected to the mounting flange of the front and rear Banpasutei, characterized in that the formation of the gap between the length of the mounting ribs set longer than the front bumper stay bumper <br/> over the front Banpasutei vehicle Mounting structure of the bumper.