JP2000344029A - Bumper installing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the elastic characteristic of an elastic member in a sound condition, in a bumper installing structure which is composed by installing a bumper main body furnished with an elastic member made of a synthetic resin, to a car body frame, through an intermediate member of a crash box and the like furnishing a synthetic resin elastic member, or through no such a member. SOLUTION: A bumper main body 100 is manufactured from an aluminum hollow extrusion structural angle, and in hollow parts 102, 103, and 104, an elastic member 106 made of an synthetic resin is filled. A crash box 110 is manufactured from an aluminum hollow extrusion structural angle, and in this hollow, an elastic member made of a synthetic resin is filled. The bumper main body 100 and the crash box 110 are abutted, and the bumper main body 100 and the crash box 110 are connected integrally, by joining the abutting part in a friction stirring junction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a bumper body such as a bumper reinforcement mounted on a body frame such as a side member via an intermediate member such as a stay or a crash box or not. The present invention relates to a bumper mounting structure.

[0002]

2. Description of the Related Art In automobiles and vehicles, bumpers are provided at predetermined height positions at the front and rear of the vehicle body for the purpose of absorbing a shock at the time of a collision or the like.

This bumper has a bumper body made of a rod-shaped metal hollow material, and the bumper body is connected to an intermediate member such as a stay, a crash box, or the like, with or without an intermediate member. It is mounted on a vehicle body by being fixedly mounted on a vehicle body frame such as a side member provided at a portion or a rear end portion. The reason why the bumper body is made of a hollow material is to reduce the weight.

[0004] In recent years, in order to improve the impact resistance of the bumper body, a bumper body in which a hollow portion of a hollow material is filled with an elastic member made of synthetic resin has been used.

[0005]

When this bumper body is used to attach it to a vehicle body frame or an intermediate member, it is suggested that a fastening member such as a rivet or a bolt is used as such attachment means. . However, according to this, there is a problem in that the connection strength is low and the fastening state is released due to loosening caused by vibration during traveling.

Alternatively, as such mounting means,
For example, use of fusion welding such as TIG and MIG is indicated. According to this, since the bumper main body is firmly joined to the vehicle body frame and the intermediate member, there is an advantage that the connection strength is increased and loosening due to vibration during traveling does not occur.

However, in the case of joining and joining by fusion welding as described above, since the hollow portion of the hollow material of the bumper body is filled with the elastic member made of synthetic resin as described above, The heat generated at this time, that is, the joining heat, causes a problem that the elastic member is thermally deteriorated and its elastic characteristics are impaired.

[0008] The intermediate member such as the crush box is made of a metallic hollow material in which a hollow portion is filled with a synthetic resin elastic member. Also in the case of using such an intermediate member and joining it to the vehicle body frame by fusion welding, similarly to the above, there is a problem that the elastic member of the intermediate member is thermally deteriorated by joining heat and its elastic characteristics are impaired. Will happen.

The present invention has been made in view of such technical background, and an object of the present invention is to provide a bumper body having an elastic member made of synthetic resin, and having a body frame provided with an elastic member made of synthetic resin. Or attached via an intermediate member without this, or without an intermediate member,
It is an object of the present invention to provide a bumper mounting structure in which thermal deformation of an elastic member due to joining heat is prevented and its elastic characteristics are maintained in a healthy state.

[0010]

In order to achieve the above object, the present invention is made of a rod-shaped hollow member having a hollow portion extending in a longitudinal direction, and a synthetic resin made in the hollow portion of the hollow material. The bumper body filled with elastic members,
In the bumper attachment structure attached to the body frame, the bumper body and the body frame are:
It is characterized by being joined and connected by friction stir welding.

According to this, friction stir welding is a kind of solid phase welding, and has the advantage that the welding heat is smaller than that of fusion welding such as TIG and MIG. By joining, the bumper main body and the vehicle body frame are joined and connected to each other, thereby preventing thermal deformation of the elastic member of the bumper main body due to joining heat, and as a result, the elastic characteristics of the elastic member are maintained in a healthy state. Further, since the joining heat is small, no thermal distortion occurs.

Further, according to the present invention, a bumper body made of a rod-shaped hollow material having a hollow portion extending in a longitudinal direction and having a hollow portion of the hollow material filled with a synthetic resin elastic member is provided with a stay. In a bumper attachment structure attached to a vehicle body frame via an intermediate member such as a crash box, the bumper body and the intermediate member are joined and connected by friction stir welding.

[0013] According to this, for the same reason as described above, the bumper main body and the intermediate member are joined and connected by friction stir welding, so that the thermal deformation of the elastic member of the bumper main body is prevented, and the elastic characteristics are sound. State is maintained.
Further, no thermal distortion occurs.

In the present invention, the intermediate member is made of a hollow material, and the hollow member of the bumper body is provided integrally with a projecting piece which is superimposed on the inner or outer surface of the hollow member of the intermediate member. In the case where the joining is performed at the overlapping portion of the projecting piece and the hollow member of the intermediate member, the joining is performed at the overlapping portion, so that the joining heat is conducted to the elastic member. Therefore, thermal deformation of the elastic member of the bumper main body is reliably prevented.

Further, the following operation is achieved. That is, in general, the welding operation of the friction stir welding is performed by using a welding tool including a large-diameter cylindrical rotor and a small-diameter pin-shaped probe protruding on the end face axis of the rotor. This is performed by inserting a probe into a portion to be joined, or further pressing the end face of the rotor against the portion to be joined, and relatively moving the joining tool while maintaining this state. Therefore, according to this friction stir welding, during the joining operation, the insertion pressure of the probe or the pressing pressure of the end face of the rotor is applied to the joining site, so that the joining site is There is a risk of deformation due to depression or the like. Therefore, in the present invention, the friction stir welding is performed in the overlapping portion. By doing so, the portion to be joined is constituted by the double wall, and the portion to be joined is strengthened. As a result, the deformation of the joint caused by the insertion pressure of the probe and the pressing pressure of the end face of the rotor is prevented.

Further, when an elastic member made of synthetic resin is filled in the hollow portion of the hollow member of the intermediate member,
Thermal deterioration of the elastic member of the bumper main body and the elastic member of the intermediate member is prevented, and the elastic characteristics of these elastic members are both maintained in a healthy state.

In the present invention, the intermediate member is made of a hollow material, and a hollow portion of the hollow material is filled with an elastic member made of synthetic resin. In the case of joining by friction stir welding, thermal deformation of the elastic member of the intermediate member is prevented, and its elastic characteristic is maintained in a healthy state.

Further, in the present invention, the vehicle body frame has a flange portion, the intermediate member is made of a hollow material, and the hollow portion of the hollow material is filled with an elastic member made of synthetic resin. A notch or cut is formed at the end of the hollow member, and the bent end is bent outward so that the bent portion is overlapped with the flange of the vehicle body frame at the end of the hollow member. Is formed, and the overlapped portion of the bent portion of the hollow member of the intermediate member and the flange portion of the vehicle body frame is friction stir welded,
When the intermediate member and the vehicle body frame are connected by joining by laser welding or spot welding, the following operation is achieved.

That is, as described above, friction stir welding is one type of solid-phase welding, and has the advantage that welding heat is smaller than that of fusion welding such as TIG and MIG. On the other hand, laser welding and spot welding are one type of fusion welding, but are characterized by lower joining heat than other fusion welding. Further, by joining the overlapped portions, as described above, the joining heat may be less likely to be conducted to the elastic member. Therefore, in the present invention, friction stir welding, laser welding, and spot welding, which are joining means having relatively small joining heat, are adopted as joining means, and a joining heat is applied to a portion where joining heat is not easily transmitted to the elastic member. A certain overlapping part was selected. As a result, thermal deformation of the elastic member of the intermediate member is prevented, and its elastic characteristics are maintained in a healthy state.

In addition, by adopting the above-mentioned bent piece of the hollow material as the portion to be superimposed on the flange portion, the portion to be superimposed on the flange portion can be formed by a simple processing, thereby improving the production efficiency. I do.

Further, the present invention provides a bumper body made of a rod-shaped hollow material having a hollow portion extending in a longitudinal direction, and a hollow portion of the hollow material filled with a synthetic resin elastic member. In the bumper attachment structure attached to the frame, the hollow material of the bumper main body has an unfilled hollow portion that is not filled with the elastic member, and the outer surface of the non-filled hollow portion of the hollow material of the bumper main body and The bumper body and the body frame are connected by abutting the body frame and joining the corresponding contact portion.

According to this, the outer surface of the unfilled hollow portion of the hollow material of the bumper body is joined to the contact portion between the body frame and the joint portion is separated from the elastic member of the bumper body. It becomes difficult for the joining heat to be conducted to the elastic member. As a result, thermal deformation of the elastic member of the bumper body is prevented, and its elastic characteristics are maintained in a healthy state.
Further, as the joining means for joining the abutting portions, it is preferable that friction stir welding is adopted, in that the occurrence of thermal distortion can be prevented. However, the present invention is not limited to this. Since there is no elastic member, various joining means can be adopted, for example, laser welding, TI
G, MIG, etc. fusion welding is adopted.

Further, according to the present invention, a bumper body made of a rod-shaped hollow material having a hollow portion extending in a longitudinal direction and having a hollow portion of the hollow material filled with an elastic member made of synthetic resin is provided with a stay. In a bumper attachment structure attached to a vehicle body frame via an intermediate member such as a crash box, the hollow material of the bumper body is
The elastic member has an unfilled hollow portion that is not filled,
The outer surface of the unfilled hollow portion of the hollow material of the bumper body is brought into contact with the intermediate member, and the corresponding contact portion is joined to connect the bumper body and the intermediate member. .

According to this, for the same reason as described above, the joint is separated from the elastic member of the bumper main body, so that it is difficult for the joining heat to be conducted to the elastic member, and as a result, the heat of the elastic member of the bumper main body is reduced. Deterioration is prevented and its elastic properties are maintained in a healthy state. The joining means for joining the contact portions is not limited. For example, friction stir welding, laser welding, fusion welding such as TIG, MIG, or the like is employed.

[0025]

Next, embodiments of the present invention will be specifically described with reference to the drawings.

First, a first embodiment of the present invention will be described. In FIG. 1A, reference numeral (100) denotes a rod-shaped bumper main body having substantially the same length as the vehicle body width. This first
In the embodiment, it is assumed that the bumper main body (100) is a bumper reinforcement horizontally disposed at the front of a vehicle body (150) of an automobile. An outer cover (not shown) is usually attached to the bumper body (100).

This bumper body (100) is shown in FIG.
As shown in the figure, it is manufactured from a hollow material (101) made of a metal extruded shape, and if this is specifically shown, it is made of an extruded shape aluminum (including its alloy, the same applies hereinafter) having a cross-sectional shape. And has three hollow portions (102) (103) (104) extending in the longitudinal direction. And these three hollow parts (102) (103)
In order to improve impact resistance, elastic members (106), (106) and (106) made of synthetic resin made of urethane foam, foamed rubber or the like are provided inside the hollow material (101). It is filled over substantially the entire length.

The bumper body (100) has a crash box (110) attached to the left and right ends thereof in such a manner that the three hollow portions (102), (103), (104) are lined up and down. ) (110) through the body (105
Left and right side members (120) provided at the front end of
At (120), it is attached in a fixed state. Therefore, in the first embodiment, the crash boxes (110) and (110) correspond to the intermediate members, and the side members (120) and (120) correspond to the body frame.

The hollow material (101) of the pumper body (100)
As shown in FIG. 1B, a pair of rear wall portions at both left and right end portions protrude toward the vehicle body and extend in a longitudinal direction opposed to each other at a predetermined interval in the vertical direction. The protruding pieces (105) and (105) are provided integrally.

As shown in FIG. 3, the protruding pieces (105) and (105) are formed at the time of extrusion production of the hollow material (101).
) Is formed by cutting and removing a part (dashed line portion) of the ridges (105a) (105a) formed integrally with the ridges (105a). As described above, by manufacturing the bumper body (100) from the hollow member (101) made of an extruded section integrally provided with the protruding pieces (105) and (105), this is advantageous in terms of efficiency and cost. Can be manufactured. Further, by using an aluminum material as the extruded shape, the weight of the pumper body (100) can be further reduced.

The crush box (110) is manufactured from a hollow material (111) made of a metal extruded profile. Specifically, the hollow box (110) is made of a hollow aluminum extruded profile having a square cross section. The hollow portion (112) is filled with a synthetic resin elastic member (115) made of urethane foam, foam rubber or the like.
The direction in which the hollow portion (112) of the hollow material (111) extends is the body (150) of the crash box (110).
In parallel with the front-back direction of the bumper body (100
) And the side member (120).

This crash box (110) is manufactured as follows. That is, FIG.
As shown in (a) and (b), first, one end of a hollow member (111) made of an extruded aluminum member having a predetermined length,
Notches (114) and (114) are formed. This notch (114
) (114) can be easily formed by punching out one end of each of the left and right opposite wall portions of the hollow member (111). Then, both ends of the opposing upper and lower walls of the hollow member (111) are forcibly bent by about 90 ° toward the opening direction, and as shown in FIG. The part is made to protrude outward, so that the hollow material (111
The bent pieces (113) and (113) are formed at the ends of ()). Next, the hollow portion (112) of the hollow member (111) is filled with an elastic member (115). As described above, the crash box (111) is manufactured. By manufacturing the crush box (111) in this manner, the portion to be overlapped with the flange portion (122) described later of the side member (120) can be formed by only two processes of punching and bending. Therefore, such a portion can be easily formed. The notch (114)
Of course, a cut (not shown) may be employed instead of (114).

The side member (120) is shown in FIG.
And, as shown in FIG. 3, a rod-shaped side member body (121) made of a hollow material made of aluminum having a square cross section.
It has. The side member body (121) is disposed in the front-rear direction of the vehicle body (150), that is, in parallel with the collision direction. Further, a flange portion (122) having a predetermined thickness protrudes in a direction perpendicular to the front-rear direction of the vehicle body (150) at a peripheral edge of a front end portion of the side member body (121).
Are provided integrally.

Next, the connection structure between the crash box (110) and the side member (120) will be described based on the connection procedure.

As shown in FIG. 4, first, the bent pieces (113) and (113) of the hollow material (111) of the crash box (110) are used.
) Is superimposed on the front surface of the flange portion (122) of the side member (120). Then, this overlapping part (131
) (131) are joined by friction stir welding, whereby the crash box (110) and the side members (120) are joined.
) And are integrated.

To explain this friction stir welding,
(300) is a welding tool for friction stir welding.
As shown in (b), a large-diameter cylindrical rotor (301),
The rotor (301) is provided with a small-diameter pin-shaped probe (302) protruding from the end surface (301a) axis of the rotor (301). Both the rotor (301) and the probe (302) are made of a heat-resistant material that is harder than the hollow member (111) and the flange portion (122) of the crash box (110) and can withstand frictional heat generated during joining. ing. Also,
On the peripheral surface of the probe (302), a ridge (not shown) for stirring the softened portion is formed in a substantially spiral shape.

Using this joining tool (300), the rotor (30)
While rotating the probe (302) by rotating 1), as shown in FIG. 5B, the probe (302) is attached to the overlapping portion (131) from the rear surface of the flange portion (122) or Insert from the front of the bent piece (113). In this insertion, the tip of the probe (302) is
) Or the bent piece (113) exceeds the thickness of one of the pieces and is inserted into the other. In the first embodiment, the probe (302) is inserted as shown in FIG.
The process is performed until the probe (302) is inserted from the rear surface of the flange portion (122) and the tip of the probe (302) exceeds the thickness of the flange portion (122) and is inserted into the bent piece (113). ing. Further, when the probe (302) is inserted, the end face (301a) of the rotor (301) is inserted into the flange (122).
A) until it touches the rear side. In the same figure, (140) is a receiving member made of a thick metal plate, which is brought into surface contact with the front surface of the bent piece (113).

Then, the probe (30) of the welding tool (300)
2) Insert the end face (301a) of the rotor (301) in the inserted state.
While being pressed against the rear surface of the flange portion (122), it is moved in the width direction of the vehicle body at the overlapping portion (131).

The probe (302) is generated by frictional heat generated by the rotation of the probe (302) or by frictional heat generated by sliding between the end surface (301a) of the rotor (301) and the rear surface of the flange portion (122). ) And the vicinity thereof, the bent piece (113) and the flange (122) soften, and the softened portion is stirred by the rotation of the probe (302), and the probe (302) moves. With
The softening and agitating part receives the advancing pressure of the probe (302) and plastically flows in such a manner as to fill the groove of the probe so as to wrap around the probe in the advancing direction of the probe (302). Is done. This phenomenon is repeated sequentially with the movement of the probe (302), and finally the crash box (110) and the side member (120)
Are joined together at a portion of the overlapped portion (131) of the bent piece (113) and the flange portion (122) where the probe (302) passes, and are integrally connected. In FIG. 1B and FIG. 2, reference numeral (161) indicates a joined portion by this friction stir welding. Thus, by performing the friction stir welding, it is possible to suppress the thermal distortion generated at the joint (161).

Since the joining between the crush box (110) and the side member (120) is performed by friction stir welding, the heat generated at the joint (161) at the time of joining, that is, the joining heat. Is small. In addition, since the joining is performed at the overlapping portion (131), the joining heat is hardly conducted from the joining portion (161) to the elastic member (115) of the crush box (110) during the joining. . Therefore, the elastic member (115) generated by the joining heat
Is reliably prevented, so that the elastic characteristics of the elastic member (115) are maintained in a healthy state.

Further, since the joining is performed at the overlapping portion (131), no deformation occurs due to the insertion pressure of the probe (302) and the pressing pressure of the end face (301a) of the rotor (301). The bent piece (113) and the flange portion (122) maintain the desired shape.

Next, the connection structure between the bumper body (100) and the crash box (110) will be described based on the connection procedure.

First, as shown in FIG. 4, a pair of projecting pieces (105) (105) of a hollow material (101) of a bumper body (100).
), Between the crush box (110) hollow material (111)
) Fits the front end of the bracket tightly or slightly. As a result, the two projecting pieces (105) and (105) are superimposed on the outer surfaces of the upper and lower walls at the front end of the hollow member (111) of the crash box (110). Then, the overlapped portions (130) and (130) are joined by friction stir welding, whereby the bumper body (100) and the crash box (110) are connected and integrated.

The joining operation of the friction stir welding is performed in the same manner as the joining operation between the crash box (110) and the side member (120). In brief, as shown in FIG. 5A, the probe (302) of the joining tool (300) is attached to the overlapping portion (130) by the projecting piece (105).
Insert from the top of When inserting the probe (302), the tip of the probe (302) exceeds the thickness of the protruding piece (105) and the crash box (11
0) until it is inserted into the hollow member (111), and further until the end face (301a) of the rotor (301) comes into contact with the upper surface of the protruding piece (105). When inserting the probe (302), care should be taken not to insert the tip of the probe (302) into the elastic member (115) of the crash box (110). Then, with the probe (302) of the joining tool (300) inserted and the end face (301a) of the rotor (301) pressed against the upper surface of the protruding piece (105), the vehicle body is placed at the overlapping portion (130). In the width direction (that is, the length direction of the bumper body (100)). By doing so, the bumper body (100) and the crush box (110) are joined and integrally connected at a portion of the overlapping portion (130) where the probe (302) passes. In FIG. 1 and FIG. 2, reference numeral (160) indicates a joined portion by the friction stir welding.

Since the joining of the bumper body (100) and the crush box (110) is performed by friction stir welding, the joining heat is small and the joining is performed at the overlapping portion (130). Therefore, at the time of joining, the joining heat is transferred from the joining portion (160) to the elastic member (115) of the crash box (110) and the bumper body (100).
Is difficult to conduct to the elastic member (106). Therefore, thermal deformation of these elastic members (115) and (106) due to joining heat is reliably prevented, and the elastic characteristics of both elastic members (115) and (106) are maintained in a healthy state. Further, since the joining is performed at the overlapping portion (130), no deformation occurs due to the insertion pressure of the probe (302) and the pressing pressure of the end face (301a) of the rotor (301). (105) and the hollow material (111) of the crush box (110) maintain the desired shape.

In the first embodiment, the joining between the crush box (110) and the side member (120) is performed by friction stir welding.
As shown in FIGS. 7A and 7B, the welding can be performed by spot welding or laser welding.

As shown in FIG. 7 (a), when joining by spot welding, a pair of round bar-shaped metal electrodes (31) are used.
0) (310), the bent piece (113) and the flange portion (122) are sandwiched between them, and current is applied while pressurizing, and the contact point is heated and melted and welded into a point. In the figure, (16
1 ') is a welded portion by this spot welding. In addition,
(311) is a power supply device for controlling the supply of current to the electrodes (310) and (310).

On the other hand, as shown in FIG. 7B, in the case of joining by laser welding, a laser beam (320) such as a CO2 laser or a YAG laser is shown from the rear surface of the flange portion (122) or shown. However, it is only necessary to irradiate from the front surface of the bent piece (113), heat and melt the two, and weld them in a dotted or linear manner. (161 '') is a welded portion by laser welding.

As described above, even when the joining is performed by spot welding or laser welding, the joining portion is formed by the overlapping portion (13) of the bent piece (113) and the flange portion (122).
Because of 1), thermal deformation of the elastic member (115) of the crash box (110) can be prevented, and the elastic characteristics of the elastic member (115) can be maintained in a healthy state.

Thus, in the first embodiment, the crash box (110) is not limited to the one described above.
For example, it may be manufactured from a hollow material (not shown) in which a plate-shaped partition extending in the length direction is integrally formed in the hollow portion (112).

The hollow material (10) of the bumper body (100)
The elastic member (106) filled in the hollow portions (102), (103) and (104) of 1) does not need to be filled in all the hollow portions of the hollow material (101) of the bumper body (100). One of the three hollow portions (102) (103) (104)
One or two pieces may be filled. Needless to say, the bumper body (100) may be made of a hollow material having a cross-sectional shape of a Japanese character, a Japanese character, a square character, or the like.

Next, a second embodiment of the present invention shown in FIGS. 8 and 9 will be described. In FIGS. 8 and 9, the same or similar elements as those in the first embodiment are denoted by reference numerals obtained by adding 100. Hereinafter, the second embodiment will be described focusing on differences from the first embodiment.

The bumper body (200) is made of a rod-shaped hollow member (201) made of extruded aluminum having a cross-sectional shape like the first embodiment. Bends (200a) (200a) bent toward the vehicle body are formed at both left and right ends of the hollow member (201). These bent portions (200a) (200a) are formed by bending.

In this bumper body (200), three hollow portions (202) (20)
3) In (204), in the middle hollow part (203),
An elastic member (206) made of synthetic resin is filled over substantially the entire length of the hollow member (201), but inside the other hollow portions, that is, inside the upper and lower two hollow portions (202) and (204), The elastic member is not filled, so that the hollow member (201) of the bumper body (200) has an unfilled hollow portion (202) (204) not filled with the elastic member.
The elastic member (206) is provided on the bumper body (200).
In order to improve the production efficiency of the two bent parts (200a)
It was filled before bending (200a) was performed.

The bumper body (200) has stays (210) and (210) attached to both left and right ends thereof.
Are fixedly attached to left and right side members (220) (220) provided at the front end of the vehicle body (250). Therefore, in the second embodiment, the stays (210) and (210) correspond to the intermediate members. Note that the side members (220) and (220) are
The configuration is the same as that of the embodiment.

As shown in FIG. 8B, the stay (210) has ribs (211a), (211a), (211a), and (211a) extending substantially parallel to the front-rear direction of the vehicle body (250). 250), a plurality of (four in the figure) spaced at an interval in the width direction, shock absorbing portions (211) arranged side by side, and ribs (211a) (211a) of the shock absorbing portions (211). After the front mounting plate (212) integrally connecting the front ends of (211a) and (211a) and the rear ends of the ribs (211a) (211a) (211a) (211a) are integrally connected And a mounting plate (213). The stay (210) is made of a metal extruded profile, specifically, an aluminum extruded profile.

The rear mounting plate portion (213) of the stay (210) is connected to the flange portion (222) of the side member (220).
) Are superimposed in surface contact with the front surface of the stay (210) and the side member (220) by being joined by friction stir welding.
And are integrally connected. This friction stir welding is performed by the same welding operation as in the first embodiment. In this manner, by performing the welding by the friction stir welding, it is possible to suppress the thermal distortion generated at the joint (261).
Here, as the joining means of the overlapping portion (231), since the stay (210) does not have an elastic member made of a synthetic resin, any joining means can be adopted. , TIG, MIG, spot welding, laser welding, or other fusion welding.

Next, the bumper body (200) and the stay (21)
0) will be described based on the connection procedure.

First, the hollow material (20) of the bumper body (200)
The front mounting plate portion (212) of the stay (210) is superimposed on the outer surface of the rear wall portion (201a) at both left and right end portions of 1) in a surface contact state. Then, as shown in FIG. 9, among the overlapping portions, hollow portions (202) and (204) above and below the hollow material (201) of the bumper body (200) (that is, unfilled hollow portions).
Of the rear wall (201a) (201a) and the stay (210)
) Overlapped with the front mounting plate (212) (230)
Are joined by friction stir welding, whereby the bumper body (200) and the stay (210) are integrally connected. (260) indicates a joint by friction stir welding. In the second embodiment, the overlapping portion (23
0) and (230), each rib (211a) (211a) (211a) (21) on the front mounting plate (212) of the stay (210).
Friction stir welding is performed only on the connection part of 1a),
For this reason, as shown in FIG. 8B, the joint (260) is formed in a dot shape.

As the joining means for joining the overlapped portion (230), any joining means can be adopted. In addition to friction stir welding, for example, laser welding, T
Melt welding such as IG and MIG can also be employed. Even in the case where the joining is performed by the fusion welding as described above, the elastic member (206) of the bumper body (200) is thermally deteriorated because the elastic member does not exist near the joint (260). No failure occurs and therefore the elastic member (20
6) It is possible to maintain the elastic properties in a healthy state.

Although the two embodiments of the present invention have been described above, the present invention is not limited to these embodiments.

The technical idea of the present invention can also be applied to a case where the bumper bodies (100) and (200) are directly mounted on the body frame such as the side members (120) and (220) without any intermediate member. Of course.

[0063]

As described above, since the present invention is a bumper mounting structure having the above structure, the following effects are obtained.

According to the first aspect of the present invention, since the bumper body and the vehicle body frame are joined and connected by friction stir welding, thermal deformation of the elastic member of the bumper body due to joining heat is prevented, and thermal deformation is prevented. Therefore, it is possible to provide a good jointed bumper mounting structure in which the elastic characteristics of the elastic member of the bumper main body are maintained in a healthy state.

According to the second aspect of the present invention, as in the first aspect, there is provided a bumper mounting structure in which the elastic properties of the elastic member of the bumper main body are maintained in a healthy state in a good joined state. Can be.

According to the third aspect of the present invention, the intermediate member is made of a hollow member, and the hollow member of the bumper body has a projecting piece superimposed on the inner surface or the outer surface of the hollow member of the intermediate member. It is provided integrally, and the joining is performed at the overlapping portion of the protruding piece and the hollow member of the intermediate member, so that the joining heat is hardly conducted to the elastic member of the bumper body, and the joining heat is Since the thermal deformation of the elastic member is prevented, it is possible to provide a bumper mounting structure in which the elastic characteristics of the elastic member of the bumper main body are reliably maintained in a healthy state. Furthermore, since the welding is performed in the overlapped portion, deformation of the welded portion caused by the insertion pressure of the probe of the welding tool for friction stir welding and the pressing pressure on the end face of the rotor is prevented, so that the welding condition is extremely good. A simple bumper mounting structure can be provided.

According to the fourth aspect of the present invention, even when the hollow portion of the hollow member of the intermediate member is filled with the elastic member made of synthetic resin, the joining is performed at the overlapping portion. Accordingly, thermal deformation of the two elastic members due to the joining heat is prevented, so that it is possible to provide a good bumper mounting structure in a joined state in which both elastic characteristics of the elastic members are kept in a healthy state.

According to the fifth aspect of the present invention, the intermediate member is made of a hollow material, and the hollow portion of the hollow material is filled with an elastic member made of synthetic resin. Since the frame and the frame are joined by friction stir welding, heat deterioration of the elastic member of the intermediate member due to the joining heat is prevented, so that the elastic characteristic of the elastic member of the intermediate member is maintained in a healthy state. A good bumper mounting structure can be provided.

According to the invention of claim 6, the vehicle body frame has a flange portion, the intermediate member is made of a hollow material, and an elastic member made of synthetic resin is provided in the hollow portion of the hollow material. Filled, a notch or notch is formed at the end of the hollow material, and the end is bent in an outwardly protruding shape so that the end of the hollow material is overlapped with the flange portion of the vehicle body frame. A bent portion of the intermediate member is formed, and the overlapping portion between the bent portion of the hollow member of the intermediate member and the flange portion of the vehicle body frame is joined by friction stir welding, laser welding, or spot welding, so that the intermediate member and the intermediate member are joined together. The connection with the vehicle body frame prevents thermal deformation of the elastic member of the intermediate member due to joining heat, and therefore, the bumper mounting in which the elastic characteristic of the elastic member of the intermediate member is maintained in a healthy state. It is possible to provide a structure. In addition, since the bent piece of the hollow material as described above is employed as the portion to be superimposed on the flange portion, the portion to be superimposed on the flange portion can be formed by simple processing, and the production efficiency can be improved. It has the effect of improving.

According to the seventh aspect of the present invention, the hollow member of the bumper main body has an unfilled hollow portion not filled with an elastic member, and the outer surface of the hollow material of the bumper main body has a non-filled hollow portion. The bumper body and the body frame are connected by the body frame being abutted and the corresponding contact portions being joined, whereby the portion to be joined is separated from the elastic member of the bumper body, so that the joining heat is reduced by the elastic member. Therefore, the thermal deformation of the elastic member of the bumper main body due to the joining heat is prevented, so that a bumper mounting structure in which the elastic characteristics of the bumper main body are maintained in a healthy state can be provided. Furthermore, since there is no elastic member near the portion to be joined, there is an effect that joining can be performed by any joining means.

According to the eighth aspect of the present invention, as in the seventh aspect, it is possible to provide a bumper mounting structure in which the elastic characteristics of the bumper main body are maintained in a healthy state. Furthermore, there is an effect that joining can be performed by any joining means.

[Brief description of the drawings]

FIG. 1 is a view showing a bumper mounting structure according to a first embodiment of the present invention, in which (a) shows a structure in which a bumper body is connected to a side member (body frame) via a crash box (intermediate member).
FIG. 2B is a partially omitted plan view showing a state where it is attached to FIG.

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

FIG. 3 is a perspective view of a bumper main body, a crash box, and a side member.

FIG. 4 is a cross-sectional view corresponding to FIG. 2 for explaining a method of connecting the crash box to the side member and a method of connecting the bumper body to the crash box.

FIG. 5A is an enlarged cross-sectional view showing a state in which the bumper body and the crash box are being joined by friction stir welding, and FIG. 5B is a process in which the crash box and the side member are being joined by friction stir welding. It is an expanded sectional view showing a state.

6A and 6B are views for explaining a method of manufacturing the crush box, wherein FIG. 6A is a perspective view showing a hollow material used for manufacturing the crush box, and FIG. 6B is a cutout formed at an end of the hollow material. FIG. 3C is a perspective view showing a state where the end of the hollow material is bent, and FIG.

FIG. 7A is an enlarged sectional view showing a state in which the crush box and the side member are being joined by spot welding, and FIG. 7B is a state in which the crush box and the side member are being joined by laser welding. It is an expanded sectional view.

FIG. 8 is a view showing a bumper mounting structure according to a second embodiment of the present invention, wherein (a) is a partially omitted plan view showing a state where the bumper main body is mounted on a side member via a stay (intermediate member); (B) is a perspective view.

9 is a sectional view taken along line IX-IX in FIG.

[Explanation of symbols]

 100… Bumper body 101… Hollow members 102, 103, 104… Hollow parts 105… Protrusions 106… Elastic members 110… Crash boxes (intermediate members) 111… Hollow members 112… Hollow parts 113… Bend pieces 115… Elastic members 120… Side member (body frame) 122… Flange parts 160, 161… Joint part 210… Stay (intermediate member) 211… Shock absorbing part 211a… Rib 260 261… Joint part 300… Joining tool for friction stir welding

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hajime Maeno 3600, Gezu, Kita-gaiyama, Komaki City, Aichi Prefecture Inside Tokai Rubber Industries Co., Ltd. (72) Inventor Hidemitsu Hamano 6, 224 Kaiyamacho, Sakai City Showa Aluminum (72) Inventor Naoki Nishikawa 6, 224 Kaiyamacho, Sakai City Showa Aluminum Co., Ltd. (72) Inventor Noriyuki Iwakichi 6, 224 Kaiyamacho Sakai City, Showa Aluminum Co., Ltd. (72) Invention Sadao Kokubo, 224 Kaiyamacho, Sakai City Showa Aluminum Co., Ltd.

Claims (8)

[Claims] A hollow portion extending in a longitudinal direction (102, 103, 103).
A bumper main body (100) made of a rod-shaped hollow member (101) having a cylindrical member (104) and filled with an elastic member (106) made of synthetic resin in a hollow portion of the hollow member is attached to a body frame (120). In the bumper mounting structure to be mounted, the bumper body (100) and the vehicle body frame (120)
Are joined and connected by friction stir welding. 2. A hollow portion (102, 103, 103) extending in the longitudinal direction.
A bumper main body (100) made of a rod-shaped hollow material (101) having an elastic member (106) made of a synthetic resin in a hollow portion of the hollow material, such as a stay, a crash box, etc. In a bumper mounting structure mounted on a body frame (120) via an intermediate member (110), the bumper body (100) and the intermediate member (110) are joined and connected by friction stir welding. A bumper mounting structure characterized by the following. 3. The intermediate member (110) includes a hollow member (111).
), And the hollow member (101) of the bumper main body is integrally provided with a protruding piece (105) that is superimposed on the inner surface or outer surface of the hollow member (111) of the intermediate member, 3. The bumper mounting structure according to claim 2, wherein said joining is performed at an overlapping portion (130) of said projecting piece (105) and said hollow member (111) of said intermediate member. 4. The bumper mounting structure according to claim 3, wherein the hollow portion (112) of the hollow member (111) of the intermediate member is filled with an elastic member (115) made of synthetic resin. 5. The intermediate member (110) includes a hollow member (111).
), And a hollow portion (112) of the hollow member (111) is filled with an elastic member (115) made of synthetic resin. The intermediate member (110) and the body frame (120) 3. The bumper mounting structure according to claim 2, wherein the bumpers are joined and connected by friction stir welding. 6. The body frame (120) has a flange portion (122), and the intermediate member (110) is made of a hollow material (111), and a hollow portion of the hollow material (111). (112) is filled with an elastic member (115) made of a synthetic resin, and a notch (114) or notch is formed at the end of the hollow member (111), and the end is formed to project outward. By being bent, a bent piece (113) is formed at the end of the hollow member (111) so as to overlap with the flange portion (122) of the body frame. The bent piece (113) of the hollow member of the intermediate member is formed. ) And a flange portion (122) of the vehicle body frame (131).
The bumper mounting structure according to claim 2, wherein the intermediate member (110) and the vehicle body frame (120) are connected to each other by friction stir welding, laser welding, or spot welding. 7. A hollow portion extending in a longitudinal direction (202, 203,
A bumper main body (200) made of a rod-shaped hollow material (201) having an elastic member (206) made of a synthetic resin in a hollow portion of the hollow material (201) has
In the bumper attachment structure attached to the vehicle body frame (220), the hollow member (201) of the bumper body has an unfilled hollow portion (202, 204) that is not filled with the elastic member. The unfilled hollow part (20) of the hollow material (201) of the bumper body
The outer surface of the vehicle body frame (220) is brought into contact with the outer surface of the vehicle body frame (220) and the bumper body (200) is connected to the vehicle body frame (220) by joining the corresponding contact portions. And bumper mounting structure. 8. A hollow portion extending in the longitudinal direction (202, 203,
A bumper main body (200) made of a rod-shaped hollow material (201) having an elastic member (206) made of a synthetic resin in a hollow portion of the hollow material (201) has
In a bumper mounting structure mounted on a body frame (220) via an intermediate member (210) such as a stay or a crash box, the hollow material (201) of the bumper body is not filled with the elastic member. It has a filled hollow portion (202, 204), and the unfilled hollow portion (20) of the hollow material (201) of the bumper body.
2 and 204), the outer surface and the intermediate member (210) are brought into contact with each other, and the corresponding contact portion (230) is joined.
A bumper mounting structure wherein the bumper body (200) and the intermediate member (210) are connected.