JP6100735B2 - Beam member for underrun protector - Google Patents

Description

  The present invention relates to an under-run protector for preventing a passenger car or the like from entering under a truck when a collision occurs between the truck and a passenger car, and more particularly to a beam member used in an under-run protector device.

For example, when a passenger car collides with the rear of a truck, if the passenger car gets under the truck body, it can cause a serious injury. Is adopted.
In the under-run protector device, the beam member is attached to the vehicle body (vehicle) frame side of the truck so as to match the bumper height of the passenger car.
Therefore, the beam member is required to have a strength and shock absorption enough to withstand an impact when it collides with a passenger car or the like.
For example, Patent Document 1 discloses a beam member having a substantially rectangular cross section made of an aluminum alloy extruded profile.
However, the beam member disclosed in the publication is formed by forming a bolt mounting work hole on the collision side flange (side surface of the beam member located outside the vehicle) and fastening the beam member to the vehicle body side with a bolt and a nut.
For this reason, by providing an attachment work hole, not only does the strength of the beam member decrease by that amount, but the attachment work hole can be seen from the outside and the appearance is inferior.
In addition, in order to eliminate the mounting work hole, there may be a rail provided with a nut insertion mounting rail over the entire length of the beam. However, there is a surplus in an unnecessary portion in terms of strength, which is contrary to weight reduction.

JP 2008-273271 A

  An object of the present invention is to provide a beam member for an underlamp protector that is effective in improving strength, is lightweight, and has excellent appearance design.

The beam member according to the present invention is a beam member for an under-run protector attached to a vehicle frame of a truck, and the beam main body portion of the beam member is composed of upper and lower horizontal walls and front and rear vertical walls made of extruded aluminum. It has a hollow cross-sectional shape and has a recessed screw hole over the entire length of each corner inside the horizontal wall and the vertical wall , and a fixing tool for placing a nut inside the vertical wall of the beam main body is the upper and lower screw holes. The beam member is attached to the vehicle frame by screwing it into the nut, and the terminal cover member uses the screw hole at the end of the beam main body. It is characterized by being attached by screws .
Here, it is preferable that the fixture has a protruding portion close to the inside of the vertical wall facing the vertical wall to which the fixture is attached.
In addition, the proximity includes not only an aspect in which the tip of the protruding portion protrudes to the vicinity of the inside of the vertical wall but also an aspect in contact with the inner surface.
This protrusion prevents deformation of the vertical wall.
Here, as a method for increasing the strength of the extruded aluminum material, it has a hollow cross-sectional shape having a plurality of hollow portions in which the front and rear vertical walls facing each other are connected by one or more horizontal ribs, and the connecting portion between the horizontal ribs and the vertical walls A rail-shaped recess may be formed on the substrate.
The rail-shaped recess means a recess formed along the extrusion direction of the extruded material, and includes a screw hole shape into which a screw is screwed.

  In this way, when an aluminum extruded material having a hollow cross-sectional shape having a rail-shaped recess such as a screw hole is used, a beam having a nut is inserted between the upper and lower rail-shaped recesses inside the hollow cross-sectional shape. A fixture can also be placed inside the body.

In the beam member according to the present invention, an end portion of the beam main body portion has a substantially L-shaped end surface shape whose lower end portion is obliquely cut, and a substantially L-shaped cover member may be attached to the end portion. .
In this way, the end face opening of the beam body made of extruded material is blocked by the cover member, so that not only the appearance is improved, but the vehicle body is tilted by the roll when the truck turns, but the lower end side of the end of the beam body is inclined. Because it has been cut into, it can be prevented from rubbing against the ground.
In this case, a protrusion may be formed on the lower oblique side portion of the cover member.
When the protrusions are formed in this way, the protrusions are preferentially rubbed when rubbed against the ground, and scratches can be reduced.

In the beam member according to the present invention, anti-slip means may be provided on the upper surface of the beam main body.
In the truck, the beam member is sometimes used as a step to put a foot on when loading or unloading a load. However, it is safe to provide a non-slip means on the upper surface of the beam main body.
Examples of the anti-slip means include a method of forming protrusions on the upper surface of the extruded material and a method of attaching an anti-slip tape.
In this case, one of the upper and lower surfaces of the beam body is formed with a non-slip uneven portion, and the other surface can be attached with a non-slip tape on a smooth surface and can be used upside down. It may be possible.

In the beam member according to the present invention, a plurality of design lines in the horizontal direction in which the intervals are gradually changed from the upper part toward the lower part may be formed on the outer side surface of the beam main body part.
In this way, even if the outer side surface of the beam member is flat, changing the spacing between the design lines gives an illusion of depth and gives a three-dimensional appearance.

Since the beam member according to the present invention has a fixture for disposing a nut inside the beam main body portion having a hollow cross-sectional shape, a conventional bolt mounting work hole is unnecessary.
In addition, a rail-shaped recess such as a screw hole is formed at the intersection of the vertical and horizontal wall corners and horizontal ribs of the extruded aluminum material having a hollow cross-sectional shape, and the end opening of the beam body is closed using this recess. In addition to the fact that the concave portion is arranged in this portion, the ridge line is not easily broken when a load is applied, and light weight and high strength can be obtained.
Further, the section modulus with respect to the bending strength is effectively improved.
The fixtures arranged inside the beam main body can prevent the mounting surface from slipping and buckling deformation, prevent the projections from deforming between the vertical walls, and reduce the weight of the beam member as a whole. be able to.

The state which attached the beam member to the vehicle frame of a truck with the connection members, such as a volt | bolt, using a stay member is shown. (A) shows an example using an L-shaped stay member, and (b) shows an example using a substantially triangular stay member. An example in which a fixing tool is inserted using a screw hole in a beam main body portion and a terminal cover member is attached to an end portion will be described. (A) shows before assembly and (b) shows after assembly. An example of a cross-sectional shape of the beam body is shown. The example which inserts a fixing tool inside a beam main-body part is shown, (a) is before insertion, (b) shows sectional drawing after insertion. (C) shows the figure which looked at the plate side of the fixture, (d) shows the figure which looked at the fixture from the nut side. (A) is explanatory drawing which rivets a fixing tool to a beam main-body part, (b) shows sectional drawing which carried out rivets. The example which provided the bulkhead part in the fixing tool is shown, (a) is the whole figure of a beam member, (b) shows explanatory drawing inserted from an edge part. The arrangement | positioning drawing of a fixing tool is shown, (a) is a back view of a beam main-body part, (b) shows a perspective view, (c) shows a single item drawing. Another example of a fixture is shown. (A) shows the end side external view of a beam main-body part. (B) is an upper surface portion of the beam main body, and (c) is a partially enlarged view of the side surface portion. Another embodiment of the end of the beam body is shown. A terminal cover member is shown, (a) is an outer perspective view, (b) is an inner perspective view. (A) is an example in which strip-shaped convex portions are formed on the upper surface of the beam main body, and (b) is an example in which the surface is inverted so that the smooth lower surface of the beam main body becomes the upper surface. An example in which a non-slip tape is attached to the smooth surface of the beam body is shown. A cross-sectional shape of the beam main body is adopted as a cross-sectional shape of a Japanese character, and an example without a screw hole is shown. (A) is the perspective view seen from the terminal cover member side, (b) shows the perspective view seen from the inner side. The side view of the state which attached the beam member to the vehicle frame is shown. The beam member before attaching to a vehicle frame is shown. The structural example which incorporates a fixture and a terminal cover member in a beam main-body part is shown. (A) is the perspective view seen from the terminal cover member side, (b) shows the perspective view seen from the inner side. (A), (b) shows the enlarged view of a terminal part. An example of a mounting cross-section structure is shown. (A) is a beam main-body part, (b) shows the connection structure of a terminal cover member.

A structural example of a beam member for an underlamp protector according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the beam member 10 is attached substantially horizontally to the vehicle frame 1 to 3 at the rear or front of the truck using the stay members 4 and 5.
FIG. 1A is a side view of the substantially L-shaped stay member 4 fixed to the side surfaces of the vehicle frames 1 and 2 with bolts or the like, and the lower side is shown in FIG. As shown, it is fastened and connected to a fixture 12 having a nut disposed inside the beam body 11.
The substantially L-shaped stick member 4 in FIG. 1A is an example in which a horizontal member having a hollow cross-sectional shape of an aluminum extruded material is fitted and connected in the same manner as a diagonally vertical member having a hollow cross-sectional shape of an aluminum extruded material. It is.
1B shows an example in which an aluminum extruded material having a substantially triangular hollow cross-sectional shape is cut into a short length, and the beam member 10 is connected to the lower surface of the vehicle frame 1 with bolts or the like. This is an example in which the member 5a is fixedly attached.
The beam member 10 according to the present invention is not limited to these attachment methods, and includes a case where the beam member 10 is directly fixed to the vehicle frame with a bolt or the like.

The beam member 10 includes a beam main body portion 11 made of an aluminum extruded material of an aluminum alloy, a fixture 12 with a nut 12a to be inserted inside, and a terminal cover member 13.
FIG. 3 shows an example of a cross-sectional shape of the beam main body 11.
It has a rectangular hollow cross-sectional shape in which the upper and lower horizontal walls 11a, 11a are connected by a pair of longitudinal walls 11b in the front-rear direction.
There is no restriction on the hollow shape such as a mouth shape, a Japanese character shape, a square shape, etc. as long as it has a rectangular hollow cross-sectional shape. An example is shown.
A screw hole 11d is formed as an example of a rail-shaped recess in the corner portion of the horizontal wall 11a and the vertical wall 11b, and in this embodiment, the fixing member 12 is hooked and inserted between the upper and lower screw holes. A screw hole 11d is also provided at the intersection of the vertical wall 11b and the horizontal rib 11c.

As shown in FIG. 4, the fixing tool 12 has a nut 12a attached thereto by welding or the like. FIG. 4 (c) is a state seen from the fastening side with the stay member, and FIG. 4 (d) is a view from the attaching side of the nut 12a. The external view of the fixing tool 12 in the seen state is shown.
The fixture 12 shown in the present embodiment has a plate shape, and is inserted between the upper and lower screw holes 11d and 11d as shown in a cross section in FIG.
In order to attach the fixture 12 to a predetermined position inside the beam main body 11, the fixture 12 is provided with a positioning notch 12c and a rivet stop hole 12b.
As shown in FIG. 5A, the pin 30 is inserted into the positioning hole 11g of the beam body 11, the fixing tool is inserted until the notch 12c of the fixing tool 12 comes into contact, and the rivet 21 is fixed through the rivet hole 11f. The tool 12 is fixed to the beam body 11.
FIG. 5B shows a state where the rivets are fixed.
As shown in FIG. 1, the beam member 10 has connecting members 4a and 5a such as bolts inserted from the side of the stay members 4 and 5 and the tips of the bolts and the like go through the fixing holes 11e of the beam body 11 and Screw into the part 12a and connect.

6 and 7 show examples of the fixture 112 in which the bulkhead portion 112a is formed.
The fixture 112 is an example in which a bulkhead portion 112a is formed by bending a substantially U-shape from the mounting surfaces 112b and 112c of the nuts 12a on both sides and projecting the central portion.
The upper and lower ends of the mounting surface 112b of one nut are inserted inward along the upper and lower screw holes of the beam body 11, and fixed to a predetermined position with rivets.
The state is shown in FIG.
The method for forming the bulkhead portion is not limited to the fixture 112, and for example, a fixture 212 in which the bulkhead portion is formed so that the nut 12a is positioned inside the protruding portion as shown in FIG.

Next, a structural example of the terminal cover member 13 will be described.
As shown in FIG. 2, the lower end side of the terminal portion of the beam main body portion 11 is cut obliquely, and is formed on a substantially L-shaped terminal cover member 13 in side view so as to close the end surface shape opening.
The terminal cover member 13 is composed of a vertical side 13a and a lower side of a hypotenuse 13b, and a projection 13c is formed on the hypotenuse 13b.
A screw hole 13d is provided in accordance with the position of the screw hole 11d, and is fixed to the end of the beam main body 11 with a fastening member 22 such as a screw.
The end surface shape of the beam main body 11 and the shape of the terminal cover member are not limited to this, and the end surface of the beam main body 11 has a vertical end surface shape as shown in FIGS. Only the member 113 may be formed on the vertical side 113a and the oblique side 113b, and the protrusion 113c may be formed on the oblique side 113b.

FIG. 9 shows an external view of the beam main body 11.
As shown in FIG. 9B, a protrusion 11h having a ridge shape is formed on the upper surface of the beam main body 11 to prevent slippage during use as a step.
A plurality of notches 11i formed laterally as design lines on the outside of the side surface of the beam body portion 11, the degree notch spacing dn go lower to the upper notch spacing d ₁ is small.
Thereby, the side surface of the beam main body 11 is felt three-dimensionally.
Further, the beam main body may be inverted as shown in FIGS. 12 and 13, and attached to the stay member so that the smooth surface 11j becomes the upper surface, and a non-slip tape 11k may be attached to the smooth surface 11j.

Next, an example of a beam member 10A in which a screw hole is not provided in the cross section of the beam main body 11a will be described.
As shown in FIGS. 14 and 17, the beam main body 11A has a Japanese character shape in which the ends in the front-rear direction of the upper and lower horizontal walls 11A are connected by a pair of vertical walls 11C, and the center of the vertical wall 11C is connected by a middle rib 11E. In this embodiment, there is no rail-shaped recess (screw hole).
In this embodiment, as shown in FIGS. 17 and 18, an example of a fixture 12 </ b> A formed of an aluminum extruded profile is shown.
The fixing tool 12A has a nut insertion rail portion 12D having a substantially U-shaped cross-section for inserting and holding the nut 12F, and is protruded from the nut holding portion close to the inner side surface of the vertical wall 11C facing substantially L-shape. Part 112A.
The protruding portion 112A has a substantially Japanese character shape having two hollow portions 12E.
Corresponding to the hollow part 11D of each beam body part, the fixing tool 12A is inserted from the cross-sectional opening end part of the beam body part 11A, and as shown in FIG. 17, the rivet 21A is attached from the back surface of the beam body part 11A to the mounting hole 11G. Are inserted into the fastening hole 12C of the fixing tool 12A and rivet tightened.
Next, the connecting member 5a made of a bolt is inserted into the mounting hole 11F from the stay member 5 which is a mounting member on the vehicle frame side, and further, the tip of the bolt is bolted to the nut 12F via the bolt hole 12B of the fixture 12A.
The cross-sectional structure is shown in FIG.

The terminal cover member 13A in the present embodiment has a slope portion 13C in which the lower side of the vertical portion 13B is L-shaped toward the inside, and the fixed piece 13E is inserted into the L-cut end portion of the beam main body portion 11A. In this example, the rivet 22A is inserted into the side rivet holes 11H and 13F, and the rivets are tightened.
The connection structure is shown in FIG.
Further, a drain hole 13D is formed on the lower end side of the terminal cover member 13A.

DESCRIPTION OF SYMBOLS 1 Vehicle frame 4 Stay member 4a Connection member 5 Stay member 5a Connection member 10 Beam member 11 Beam main-body part 12 Fixing tool 13 Terminal cover member

Claims (2)

A beam member for an underrun protector to be attached to a vehicle frame of a truck,
The beam body of the beam member has a hollow cross-sectional shape composed of upper and lower horizontal walls and front and rear vertical walls made of aluminum extruded material,
It has a recessed screw hole over the entire length of each corner inside the horizontal wall and the vertical wall,
The fixture for disposing the nut on the vertical wall inside of the beam body portion inserted along the upper and lower screw holes,
A beam member is inserted into the vehicle frame by inserting a bolt from an attachment portion on the vehicle frame side and screwed into the nut, and a terminal cover member is attached to the end portion of the beam main body portion with a screw using the screw hole. A beam member. The ends of the beam body portion is made substantially L-shaped end surface shape with a lower end portion is obliquely cut, according to claim 1, characterized in that fitted with terminal cover member having a substantially L-shape to the end portion Beam member.

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