JP2015044571A - Stay member for underrun protector, and connection structure for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight stay member capable of easily achieving high strength and capable of being inexpensively manufactured, and an underrun protector structure using the same.SOLUTION: A stay member for an underrun protector connects a vehicle frame of a truck and a beam member thereof. The stay member is manufactured from an aluminum-extruded material. The stay member is formed in a hollow cross-sectional shape in which a vehicle-side connection part for being connected to the side of the vehicle frame and a beam-side connection part for being connected to the side of the beam member are connected together by a supporting rib.

Description

The present invention relates to a stay member used for connecting a beam member to a vehicle of a truck in order to prevent the passenger car or the like from getting under the truck when a collision between the truck and a passenger car occurs.
The present invention also relates to an underrun protector structure using the stay member.

For example, when a passenger car collides with the rear of a truck, if the passenger car sinks under the truck, a serious injury may occur, so a beam member that matches the bumper height of the passenger car can be attached to the truck vehicle. Has been done.
In this case, since the height of the truck body is generally higher than the height of the bumper of the passenger car, the stay member is placed between the beam member and the vehicle frame so that the height of the beam member matches the bumper height of the passenger car. Often intervenes.
For example, Patent Document 1 discloses a bracket press-molded as a stay member.
However, the stay member needs to be strong enough to support the beam member that is subjected to a large impact at the time of rear-end collision, and in particular, in a truck underrun protector, there is a large step in the height between the vehicle frame and the beam member. For this reason, since a large load is applied to the stay member in the downward twisting direction, the press-molded product is thick and large, and the shape is complicated, resulting in a heavy weight.
Moreover, it will be expensive if a large press facility is used.

JP 2012-131449 A

  An object of the present invention is to provide a stay member that is lightweight and easy to increase in strength and can be manufactured at low cost, and to provide an underrun protector structure using the stay member.

A stay member according to the present invention is a stay member for connecting a vehicle frame and a beam member of a truck in an underrun protector, and the stay member is manufactured using an aluminum extruded material and is connected to the vehicle frame side. It is characterized by having a hollow cross-sectional shape in which a side connecting portion and a beam side connecting portion connected to the beam member side are connected by a support rib.
When an aluminum extruded material is used, the degree of freedom of the hollow cross-sectional shape is high, and the shape and number of support ribs can be easily set, so that it is easy to increase the strength.
Moreover, since it can manufacture by cut | disconnecting the long extrusion material which consists of a hollow cross-sectional shape to a short length, a manufacturing cost also becomes cheap.

By utilizing such features of the extruded material, it is a stay member for connecting the vehicle frame of the truck and the beam member in the underrun protector, and the stay member has a hollow cross-sectional shape made of an aluminum extruded material. The first stay member connected to the beam member and the second stay member connected to the vehicle frame side can be connected in a substantially L shape.
In this case, the connection strength of the first stay member and the second stay member increases when one stay member is fitted and connected to the other stay member.
In the stay member according to the present invention, an auxiliary stay member having a hollow cross-sectional shape for adjusting the protruding amount of the beam member may be connected to the beam member side.
Furthermore, these stay members may have step members or be attachable.
Here, the step member refers to a member that can be easily put on when loading or unloading a truck.

  The stay member according to the present invention can use a 6000 series aluminum alloy or a 7000 series aluminum alloy having high versatility according to the JIS standard, and an underlamp protector structure excellent in shock absorption can be obtained.

  Since the stay member according to the present invention uses an aluminum extruded material having a hollow cross-sectional shape, the stay member is a high-strength and lightweight stay member. Therefore, when the beam member is connected to the vehicle frame, the under-lamp protector is light as a whole. It becomes.

The example which connected the beam member to the vehicle frame rear part of the truck using the stay member is shown. (A) shows a side view of the underrun protector, and (b) to (d) show six views of a single stay member. (A) is the perspective view seen from the beam side connection part of a right and left stay member, (b) shows the perspective view seen from the vehicle side connection part. An example of a stay member composed of two hollow portions is shown, (a) is a partial perspective view of a beam member attached to a vehicle, (b) is a side view, and (c) and (d) are perspective views of a single stay member. Show. The other example of a shape of a stay member is shown, (a) shows the side view of an attachment state, (b)-(f) shows the 6th surface figure of a stay member single item. The other example of a shape of a stay member is shown, (a) shows the side view of an attachment state, (b)-(f) shows the 6th surface figure of a stay member single item. The example which connected the beam member to the vehicle frame using the L-shaped stay member is shown, (a) shows the case where there is no auxiliary stay member, and (b) shows the case where the auxiliary stay member is connected. (A) is the perspective view seen from the beam member side, (b) shows the perspective view seen from the stay member side. (A) is a side view of a connected state, (b) is a plan view thereof, and (c) to (e) are single-component drawings of components. (A) shows an example of a component structure, and (b) shows an assembly drawing. The example of the 2nd stay member without a level | step-difference part is shown, (a) is an assembly drawing, (b) shows an exploded view. The example of a connection of the 1st, 2nd stay member is shown, It is a connection example of the volt | bolt using a collar, (a) Before connection, (b) shows after connection. The example which connected the 1st, 2nd stay member using the rivet is shown, (a) is a perspective view, (b) is a side view, (c) shows the AA sectional view. The example which attached the step member using the stay member is shown, (a) shows before attachment, (b) shows after attachment. The example which provided the cross-sectional thickness difference in the stay member is shown. Sectional drawing of the state which attached the beam member to the vehicle frame using the stay member is shown. The example which connected the 1st stay member and the 2nd stay member by the rivet is shown. (A) is an external perspective view, and (b) and (c) show examples in which the lengths of the first stay members are different. (A) A state in which the first stay member and the second stay member are connected, and (b) shows a component configuration example before connection. The exploded view seen from the 1st stay member side is shown. The attachment sectional view of a beam member is shown. An example in which the length of the auxiliary stay member is different between (a) and (b). The example of a component structure at the time of using an auxiliary stay member is shown. (A) is a cross-sectional structure of the connecting portion of the beam member, and (b) is a cross-sectional structure of the connecting portion of the first stay member and the second stay member.

A structural example of an underrun protector using a stay member according to the present invention will be described below with reference to the drawings.
FIG. 1 shows an example of a stay member 10 using an aluminum extruded material having a hollow section having a substantially triangular cross section.
Single item diagrams of the stay member 10 are shown in FIGS. 2 (b) to 2 (f) and FIGS. 3 (a) and 3 (b).
The example which attached the beam member 20 extended in the vehicle width direction using the two right and left stay members 10 to the rear part of the vehicle frames 1-3 of a truck is shown.
The stay member 10 includes a substantially horizontal vehicle-side coupling portion 11 coupled to the vehicle frames 1 and 2 and a substantially vertical beam-side coupling portion 12 bent downward from the vehicle-side coupling portion 11. It has a hollow cross-sectional shape in which the inner middle portion of the vehicle side coupling portion 11 and the inner middle portion of the beam side coupling portion 12 are integrally coupled by the support rib 13.
The stay member 10 is obtained by extruding an aluminum alloy extruded material having such a hollow cross-sectional shape, cutting the obtained long material into round pieces, and forming a short material.
At that time, if necessary, it is cut obliquely as shown in FIGS. 2C and 2F, and the fastening holes 11a, 12a, the bolt fastening work hole 13a, the work notch 13b, and the like are machined.
The beam side connecting portion 12 of the stay member 10 is connected to the side surface of the beam member 20 through the fastening hole 12a using a fastening member 32 such as a bolt.
The vehicle-side connecting portion 11 of the stay member 10 is connected to the lower surface of the vehicle frame 1 using a fastening member 31 such as a bolt via a fastening hole 11a.
As shown in FIG. 3, a pair of left and right stay members 10L and 10R are arranged on the left and right vehicle frames 1 and 2, and the beam member 20 is attached in a substantially horizontal direction.

FIG. 4 shows an example of the stay member 10 </ b> A manufactured in a hollow cross-sectional shape having two hollow portions in which intermediate portions of the beam side connecting portion 12 and the support rib 13 are connected by the reinforcing rib 15.
By connecting the intermediate portion of the support rib 13 and the intermediate portion of the beam side connecting portion 12 with the reinforcing rib 15, a hollow cross-sectional shape having two hollow portions 14a and 14b is formed, and the strength is increased.
The stay member 10B shown in FIG. 5 shows an example in which the extruded material is cut obliquely when the extruded material is cut into a short material, and the work holes 13a for bolt fastening and the work notches 13b and 13c are formed in the support rib 13.
FIG. 6 shows an example in which the vehicle-side connecting portion 11 and the beam-side connecting portion 12 are connected by double support ribs 13 and 16 as the stay member 10C.

FIG. 7 shows an example of a stay member in which a first stay member 110 having a hollow cross section made of an aluminum extruded material and a second stay member 210 are connected in a substantially L shape.
Such a stay member is effective for attaching the beam member 20 using the side surface of the vehicle frame 1, and the attachment height of the beam member 20 can be adjusted by the length of the second stay member 210.
In the embodiment shown in FIG. 7, (a) shows the case where there is no auxiliary stay member, and (b) shows the amount of protrusion of the beam member 20 in the horizontal direction from the vehicle using the auxiliary stay member 310 made of an aluminum extruded material. An adjusted example is shown.
Accordingly, FIG. 7A shows an example in which the beam member 20 is directly connected to the first stay member 110 without using the auxiliary stay member 310.
In the substantially L-shaped stay member shown in FIGS. 7 to 10, as shown in FIG. 9B, two substantially plate-like connecting portions 111 are integrated from the plate-like beam-side connecting portion 112. The hollow part 114 is formed by extruding and connecting the middle part of the connecting part 111 with the connecting rib 113.
On the other hand, the second stay member 210 on the vehicle frame side is integrally formed with a hollow connecting portion 212 having a small size in the width direction and a vehicle frame side connecting portion 211 having a larger size, and a reinforcing rib at the step portion. 213 is provided.
Thereby, the hollow connection part 212 can be inserted in the fitting recessed part 115 of the 1st stay member 110, and can be bolt-connected by the fastening holes 111a and 212a.
The second stay member 210 has a hollow cross-sectional shape having hollow portions 214a and 214b, and can be manufactured from an aluminum extruded material and has high strength.
The second stay member 210 is bolted to the vehicle frames 1 and 2 on the upper side. Since there is a gap between the hollow connecting portion 212 having a small width dimension and the vehicle frames 1 and 2, the spacer 220 is formed in the gap. Install.
In addition, as shown in FIG. 11, you may employ | adopt the 1st stay member 210a without a level | step-difference part.
The auxiliary stay member 310 has a hollow cross-sectional shape having an intermediate rib 311, and by forming a screw hole 312, the auxiliary stay member 310 is sandwiched using a long bolt 32 as shown in FIG. In this example, the first stay member 110 and the beam member 20 are connected.
The auxiliary stay member 310 also uses an extruded aluminum material, so that the protruding length of the beam member can be adjusted according to the cutting length.
In the present embodiment, by providing the auxiliary stay member 310, the step member 40 can be attached as shown in FIGS. 9A and 9B, and the stay member is used as shown in FIG. A step member (step panel) 40a can be attached.
In this embodiment, anti-slip irregularities are formed.
As shown in FIG. 12, the first stay member 110 and the second stay member 210 can push the collar 33a into the hollow portion to increase the strength of the connecting portion. Also, as shown in FIG. The connection used may be used.

15 and 16 show an example in which a thickness difference is provided in the cross section of the stay member 10D.
In the present embodiment, the cross-sectional thickness of the vehicle side connecting portion 11 is formed in the thick portion 111a on the beam member 20 side and the thin portion 111b on the support rib 13 side, and the beam side connecting portion 12 is also on the vehicle frame side thick portion 112a. This is an example of forming the thin portion 112b on the support rib 13 side.
Thereby, weight reduction can be achieved, ensuring the connection strength of a stay member.
In addition, the present embodiment shows an example in which a fixing member 22 provided with a nut 22 a is inserted inside the beam member 20 and attached and fixed with a bolt 32.
The fixing member 22 has a hollow cross-sectional shape that is slightly shorter than or equal to the interval between the front and rear vertical walls.
In this embodiment, the fixing member 22 is also made of an aluminum extruded material.
Thereby, the fixing member 22 prevents the deformation | transformation of the direction where the space | interval between vertical walls becomes narrow.

17 to 20 show an example in which the first stay member 110A and the second stay member 210A are connected using a rivet 33A.
In this embodiment, the hollow connecting portion 212 of the second stay member 210A is inserted between a pair of parallel connecting portions 111 of the first stay member 110A, and a cross-sectional view of the hollow connecting portion 212 is shown in FIG. The collar member 33B is inserted therein, and the rivet 33A is rivet caulked in a state of being inserted through the collar member 33B.
During the caulking, the core portion of the rivet is expanded in diameter, and there is no backlash between the mounting holes of the first stay member and the second stay member and the core portion of the rivet.
FIGS. 17B and 17C are examples in which the length of the first stay member is different.
With this length, the protruding amount of the beam member to the rear can be adjusted.

21 to 23 are examples in which auxiliary stay members 310A and 310B are inserted and connected between the beam member 20 and the first stay member 210A to adjust the protruding amount of the beam member.
310A and 310B are examples of different lengths.
FIG. 22 shows an exploded view of the parts of this example, and FIG. 23 shows an example of a cross-sectional structure.
In this example, the first stay member 110A and the second stay member 210A are connected by rivet caulking.
Since the cross-sectional structure of the auxiliary stay members 310A and 310B is the same as that of 310, description thereof is omitted.

DESCRIPTION OF SYMBOLS 1 Vehicle frame 10 Stay member 11 Vehicle side connection part 12 Beam side connection part 13 Support rib 14 Hollow part 20 Beam member 110 First stay member 210 Second stay member 310 Auxiliary stay member

Claims (6)

A stay member for connecting the vehicle frame of the truck and the beam member in the underrun protector,
The stay member is manufactured using an extruded aluminum material, and has a hollow cross-sectional shape in which a vehicle-side connecting portion connected to the vehicle frame side and a beam-side connecting portion connected to the beam member side are connected by a support rib. Stay member. A stay member for connecting the vehicle frame of the truck and the beam member in the underrun protector,
The stay member is characterized in that a first stay member connected to a beam member having a hollow cross-sectional shape made of an extruded aluminum material and a second stay member connected to the vehicle frame side are connected in a substantially L shape. Stay member.   The stay member according to claim 2, wherein one stay member of the first stay member and the second stay member is fitted and connected to the other stay member.   The stay member according to any one of claims 1 to 3, wherein an auxiliary stay member having a hollow cross-sectional shape for adjusting a protruding amount of the beam member is connected to the beam member side.   The stay member according to any one of claims 1 to 4, wherein the stay member has a step member or can be attached thereto.   An underrun protector structure in which a beam member is connected to a vehicle frame of a truck using the stay member according to claim 1.

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