JPS607250Y2 - automotive bumper - Google Patents

Description

[Detailed description of the invention] This invention consists of a bumper for an automobile, specifically a bumper body made of synthetic resin, a reinforcing member extending almost the entire length on the back of the bumper body, and bumper stays attached to both ends of the reinforcing member. Part 1 of the car bumper
The purpose of this is to provide an automobile bumper that allows the bumper body to effectively act as an energy absorbing member in the event of an accident such as a collision, and that does not require replacement or repair in the event of a relatively minor collision such as when reversing. Yes.

A second object is to provide an inexpensive automobile bumper with a simple structure and good appearance.

Conventionally, as shown in FIG. 6, this type of automobile bumper has a synthetic resin bumper body a having a generally C-shaped cross section, and has reinforcing ribs C integrally protruding from the back side of the front wall of the bumper body a. Bolt through holes e are provided at multiple locations on each of the front wall and the top wall d.

f, and a sheet metal reinforcing member h having a U-shaped cross section and extending over almost the entire length of the bumper body a, is provided on the back surface of the bumper body a.
through holes e and f provided in the bumper body a to be inserted into the bumper body a;
By inserting decorative bolts i and j into the reinforcing member h, respectively, and screwing nuts k and 1 into the inserted ends thereof, the bumper body a and the reinforcing member h are connected and attached to the reinforcing member. It is supported on the vehicle body via a bumper stay g.

However, in the conventional structure as described above, the bumper main body and the reinforcing member are firmly connected by a thick wall portion with high rigidity, so that the bumper main body hardly functions as an energy absorbing member in the event of a collision.

Therefore, even in a minor collision, the joint between the bumper body and the reinforcing member may be deformed, or in a slightly larger collision, the bumper stay and the vehicle body may be deformed.
There are defects that require replacement of the bumper and repair of the vehicle body, which increases the financial burden on the user.

Furthermore, the bumper fixing means as described above uses expensive cosmetic bolts i and j, which makes the bumper expensive, and the bolts 1. Since the head of bumper j is exposed to the outside of bumper body a, this is unfavorable in terms of appearance.

The present invention was devised to eliminate the above-mentioned defects, and includes mounting ribs and reinforcing ribs that are thinner than the bumper body and extend horizontally in the vehicle width direction on the back side of the bumper body. By connecting the reinforcing member to the front wall of the bumper body at a predetermined interval, in the event of a collision, before the bumper body deforms, the mounting ribs are elastically deformed to absorb and alleviate the impact energy, and If a large impact load is received that cannot be absorbed or alleviated due to elastic deformation of the mounting rib, the mounting rib is crushed before the reinforcing member or bumper stay deforms, and the reinforcing rib is buckled to absorb the impact energy. To provide an automobile bumper which can surely prevent a reinforcing member and a bumper stay from being deformed by the relaxation, has a simple structure, is inexpensive, and has a good appearance.

The embodiments of the present invention will be described above with reference to the drawings.

In the figure, reference numeral 1 denotes a bumper body made of synthetic resin, which is approximately C-shaped in cross section by an upper wall 1a, a lower wall 1b, and a front wall 1c. Thin mounting ribs 2, 2 extending in the longitudinal direction are integrally provided at the upper and lower parts of the mounting ribs 2, 2,
A plurality of reinforcing ribs 3 are integrally provided between the two.

Reference numeral 4 denotes a reinforcing member made of sheet metal and having a U-shaped cross section and extending over almost the entire length on the back surface of the bumper body in order to provide the required rigidity to the bumper body, and bumper stays 5 connected to the rigid member B of the vehicle body A are attached to both ends of the reinforcing member 4. is welded.

In the case shown in FIGS. 2 and 3, the mounting rib 2.2 is
These ribs 2, 2 are provided on the back surface of the front wall 1c of the bumper body 1 at its upper and lower parts, and each of these ribs 2, 2 is thinner than the wall thickness of the bumper body 1, so that the bumper body 1 deforms in the event of a collision. This is done in order to transform it into a curved shape.

At multiple locations on the rear end of the mounting rib 2 located at the top,
A nut plate 6 having a U-shaped cross section with a nut 6a is inserted, the upper wall 4a of the reinforcing member 4 is applied to the lower surface of the rib 2, and the nut plate 6 is inserted from below the upper wall 4a.
The bolt 7 is screwed into the nut 6a of the bumper body 1, and the mounting rib 2 located at the lower part and the lower wall 4b of the reinforcing member 4 are fixed with the bolt 8 and nut 9.
and the reinforcing member 4 are fixed together.

Further, the reinforcing ribs 3 in the bumper body 1 are also made thinner than the wall thickness of the bumper body 1, and the reinforcing ribs 3 of the brackets are provided with a predetermined interval between them and the intermediate wall 4c of the reinforcing member 4, so that the mounting When the ribs 2, 2 cannot absorb the impact force even if they are curved, the reinforcing rib 3 comes into contact with the intermediate wall 4c of the reinforcing member 4, and the mounting rib 2
, 2 to absorb and alleviate the impact force, and when receiving an impact force that cannot be buffered by each of these reinforcing ribs 3, the mounting ribs 2 are crushed as shown in Fig. 4. Energy is absorbed by the buckling of the reinforcing ribs 3, thereby preventing deformation of the reinforcing member 4 and bumper stay 5 and deformation of the vehicle body A, and the impact force can be alleviated in multiple stages.

In addition, the upper wall 1a and the lower wall 1b of the bumper body 1 are described above.
Mounting ribs 2, 2 are formed near the upper wall 4a and lower wall 4b of the reinforcing member 4, respectively.
However, in the present invention, as shown in FIG. 5, a mounting rib 2 is formed only near the upper wall 1a of the bumper body 1, and the upper wall 4a of the reinforcing member 4 is attached to the rib 2.
In addition, the lower wall 4b of this member 4 may be fixed to the lower wall 1b of the bumper body 1 via bolts 8 and nuts 9. In this case, the curved deformation of the upper mounting rib 2 may be fixed. This buffers the impact force.

Further, the present invention can be applied to both a front bumper and a rear bumper.

The bumper of the present invention has the above structure, and when the bumper body 1 collides with an obstacle at a relatively low speed and receives an impact force, first the mounting rib 2 , 2 are curved and deformed to absorb and alleviate the impact force.

Further, when an impact force that cannot be absorbed by the mounting ribs 2, 2 alone is received, the reinforcing rib 3 comes into contact with the reinforcing member 4 due to the bending deformation of the mounting rib 2°2, causing the rib 3 to bend and deform. However, together with the mounting ribs 2, 2, it absorbs and alleviates the impact force, and in the case of an impact force of this level, as soon as the impact force disappears, the ribs 2, 3 return to their original state. It returns and can be reused.

Furthermore, if a large impact force that cannot be absorbed is received due to the elastic deformation of the ribs 2 and 3, the energy is absorbed by the crushing of the mounting ribs 2 and buckling of the reinforcing ribs 3, as shown in FIG. It can be done.

In this case, deformation of the reinforcing member 4, bumper stay 5, and vehicle body A can be prevented or reduced, and it is only necessary to replace the bumper body 1.

As explained above, the automobile bumper of the present invention has at least one mounting rib extending horizontally in the vehicle width direction on the back surface of the bumper body and for attaching the bumper body to a reinforcing member, and reinforcing the bumper body; A reinforcing rib is provided to improve the rigidity of the bumper body, and a reinforcing member is coupled to the mounting rib with a predetermined gap to the front wall of the bumper body, and each of the ribs constituting the bumper body is connected to the bumper body. Since the wall is thinner than that of the bumper body, the mounting rib attaches the bumper body to the reinforcing member without deforming the bumper body in the event of a collision without using a special shock absorbing member, and the mounting rib that reinforces the bumper body The impact load can be absorbed by the reinforcing member, and in the case of a relatively light impact load, the elastic deformation of the mounting rib absorbs and alleviates the impact force, without damaging the appearance of the bumper body. When it is used up, it can return to its old state and be reused continuously, and in the case of a large impact load that cannot be absorbed and alleviated by the elastic deformation of the mounting ribs, the mounting ribs can be reused before the reinforcing members or bumper stays are deformed. Impact energy can be absorbed and alleviated by crushing the mounting ribs and buckling the reinforcing ribs.
It is possible to reliably prevent the auxiliary member and bumper stay from deforming, and also to prevent impact from being transmitted to the vehicle body, thereby ensuring the safety of the driver.

Moreover, by using the mounting rib provided on the back surface of the bumper body, which originally attaches the bumper body to the reinforcing member, and the reinforcing rib that reinforces the bumper body, the wall thickness of these mounting ribs and reinforcing ribs is By making the bumper thinner than the bumper body, it can be used as a shock absorbing member that can absorb the impact load during a collision.
It is not necessary to newly provide a shock absorbing member, and it is possible to easily provide an automobile bumper with a simpler structure.

In addition, the present invention has a structure in which a mounting rib is provided on the back of the bumper body and a reinforcing member is attached to the rib, so the bolt head is not exposed to the outside as in the conventional case, and the appearance is good. Moreover, since the fixing bolts are hidden within the bumper, ordinary bolts can be used without using decorative bolts, and the bumper can be made at low cost.

[Brief explanation of the drawing]

Fig. 1 is a plan view schematically showing an automobile equipped with the bumper of the present invention, Fig. 2 is a slope view of the bumper, Fig. 3 is an enlarged side sectional view of the bumper, and Fig. 4 is a diagram showing the bumper during energy absorption. A sectional view showing the deformation, FIG. 5 is a side sectional view showing another embodiment of the bumper,
FIG. 6 is a side sectional view showing a conventional example.

Claims (1)

[Scope of utility model registration request] An automobile bumper comprising a bumper main body made of synthetic resin, a reinforcing member extending almost the entire length on the back surface of the bumper main body, and bumper stays attached to both ends of the reinforcing member, the bumper comprising a bumper main body made of synthetic resin, a reinforcing member extending almost the entire length on the back surface of the bumper main body, and a bumper stay attached to both ends of the reinforcing member. at least one mounting rib and a reinforcing rib extending horizontally, the reinforcing member is coupled to the mounting rib with a predetermined gap to the front wall of the bumper body, and each rib is made thinner than the bumper main body. For an automobile, the bumper body is deformed before being deformed during a collision, and the mounting rib is crushed before the reinforcing member and the bumper stay are deformed, and the reinforcing rib is buckled. Bumper.