JP4307824B2 - Front underrun protector reinforcement and connection structure and manufacturing method of the same reinforcement and connection member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for connecting to a frame that also serves as a reinforcement for a track frame under-intrusion prevention mechanism (hereinafter referred to as FUP) , and a method for producing a reinforcing and connecting member .
[0002]
[Prior art]
The FUP (Front Underrun Protecter), upon collision of the passenger car such as a large truck, the passenger car and the like is intended to prevent lead to serious accidents sunk under the lorry.
[0003]
Although FUP is currently under research and development, many of them that have been seen so far have a square or circular closed cross-section, and have built-in reinforcement members inside to try to combat crushing during a collision. The FUP is considered to be attached to the front end 2a of the support arm 2 supported by the frame F of the truck via a connecting member as will be described later.
[0004]
As the connecting member, for example, it is considered to use a member as shown in FIG. 7 which is also used in a rear bumper or the like. That is, the connecting member 3 is a steel plate member having a thickness of 2.3 to 6 mm in which flange portions 3b and 3c are integrally formed on both ends and upper and lower ends of a box-shaped main body portion 3a. 3c is fixed to the back and top surfaces of the FUP 1 'at predetermined positions by welding W, and the main body 3a is fixed to the tip of the support arm 2 by a bolt (not shown) passed through a bolt hole 3d. It is.
[0005]
However, in the connecting member 3 as described above, the difference in section modulus between the AA section and the BB section in FIG. 7 is as large as about 1 to 2, for example, so that the upper and lower flange portions 3c are fixed by welding. However, due to the impact force P1 applied to the FUP 1 ′ under severe load conditions, stress concentration may occur at the Q point corresponding to the boundary between the main body 3a and the flange 3b, and the FUP 1 ′ may be bent at the Q point. There is a possibility that the effect that the connecting member 3 reinforces the FUP 1 ′ is not sufficiently exhibited.
[0006]
Further, the FUP 1 may be bent by the impact force P1, and the connecting member 3 may be crushed. Further, it is conceivable that the connecting member 3 is not expected to have a reinforcing effect, and the FUP 1 itself is provided with necessary rigidity to reinforce the entire length, but this tends to cause a large increase in weight.
[0007]
[Problems to be solved by the invention]
Therefore, the problem to be solved by the present invention is to relieve stress concentration, complement the strength of the FUP, and further improve the material yield of the connecting member, as well as the reinforcing and connecting structure of the FUP and the manufacturing method of the reinforcing and connecting member. Is to provide.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the FUP reinforcing and connecting structure of the present invention and the manufacturing method of the reinforcing and connecting member are as follows. A fixed portion to the track frame having a U-shaped cross section that conforms to the shape of the curved portion of the FUP and the tip end portion is in close contact with, and a mounting portion to the upper and lower surfaces of the FUP that are integrally extended while being obliquely shifted from the fixed portion in one direction And two FUP reinforcing / connecting members having openings formed on the opposite side of the front end portion of the fixed portion, symmetrically with respect to the center in the longitudinal direction, are shifted from the straight portion to the curved portion of the FUP. In this case, the front end of the fixed part is brought into close contact with the FUP so that the opening faces each other, and the fixing part and the mounting part are welded to the FUP by covering the mounting part with the upper and lower surfaces of the FUP. Through The reinforcing and connecting structure is characterized in that the FUP is reinforced and connected to the chassis frame, and when the reinforcing and connecting member is deployed in a width plate, the track frame having a predetermined width in the center in the width direction is provided. The fixing portions are integrally formed on both sides of the fixing portion so as to be obliquely shifted in one direction from the fixing portions to form the attachment portions to the upper and lower surfaces of the FUP that reach the end surface of the width plate, and opposite to the front ends of the fixing portions. The manufacturing method of the FUP reinforcing and connecting member is characterized in that a concave portion having the same shape as the fixed portion is formed on the side so that the material of the reinforcing and connecting member can be taken continuously from the width plate.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The preferred embodiments of the present invention, will be described with FIGS. 1-5, the reinforcing and connecting structure of the present invention FUP, in the rear surface of the FUP 11 having a curved portion that curves to the rear surface direction in the vicinity of the end portion, during assembly A fixed portion 12a to the track frame F having a U-shaped cross section that fits the shape of the curved portion of the FUP and is in close contact with the FUP 11, and a FUP that integrally extends while being obliquely shifted in one direction from the fixed portion 12a. The two reinforcing and connecting members 12, 12 having an attachment portion 12b to the upper and lower surfaces and an opening portion 12c formed on the opposite side of the tip portion of the fixing portion 12a are symmetrically about the center in the longitudinal direction, At the position of transition from the straight part of the FUP to the curved part, the front end of the fixed part 12a is brought into close contact with the FUP 11 so that the opening 12c faces each other, and the mounting part 12b is placed on the FUP 11 The lower surface 11a, is covered to 11b brought welding W the fixing portion 12a and mounting portion 12b to FUP11, through the support arm by the fixing unit, which is coupled to the chassis frame while reinforcing the FUP, reinforcement of the present invention FUP When the reinforcing and connecting member 12 is unfolded in the width plate 13 , the connecting and connecting member is manufactured in such a manner that the fixing portion 12a to the track frame F having a predetermined width in the center in the width direction is integrally formed on both sides thereof. In addition, the mounting portions 12b to the upper and lower surfaces 11a and 11b of the FUP 11 that are obliquely shifted in one direction from the fixing portion 12a to the end surface of the width plate 12 are formed, respectively, and on the side opposite to the tip of the fixing portion 12a, A recess 12f having the same shape as the fixed portion 12a is formed so that the material for the reinforcing and connecting member can be taken continuously from the width plate 13 .
[0010]
The embodiment shown in FIGS. 1 to 5 will be described in more detail.
In the illustrated example of the reinforcing and connecting member 12, in the illustrated example, the fixing portion 12 a has an opening portion 12 c that matches the curved portion shape of the FUP and has a U-shaped cross section in which the tip portion is in close contact. The upper and lower portions of 12a extend obliquely in one direction from the fixing portion 12a to the frame F, and mounting portions 12b to the upper and lower surfaces 11a and 11b of the FUP 11 are integrally formed. The fixing portion 12a has bolts. A hole 12d and a hole 12e for weight reduction are formed. In this example, open the bolt hole 12d in the opening 12c side, it is fixed to the nut (not shown) on the back of it.
[0011]
In the illustrated example, the reinforcing and connecting member 12 has a U-shaped cross section, but the shape and depth of the opening 12c are determined by the cross sectional shape and size of the FUP 11 , and if the FUP is a square cross section, the thickness of the upper and lower surfaces is determined. For example, ½.
[0012]
As shown in FIG. 3, the material of the reinforcing and connecting member 12 can be obtained by fixing the track frame fixing portion 12a having a predetermined width at the center in the width direction when the whole is expanded in the width plate 13. Attaching portions 12b to the upper and lower surfaces 11a, 11b of the FUP 11 are formed integrally on both sides, and are obliquely shifted in one direction from the fixing portion 12a to reach the end surface of the width plate. As a result, the frame A recess 12f having the same shape as the fixing portion 12′a to the frame of the adjacent reinforcing and connecting member 12 ′ is formed on the opposite side of the tip of the fixing portion 12a to the frame, and is continuously connected to the width plate 13 for reinforcing and connecting. Material removal of the members 12, 12 ', ... is possible.
[0013]
Reinforcing and connecting member 12 according to the present invention formed as described above, in FUP11 begins Egaki the curve end positions with a curved portion that curves to the rear surface direction in the vicinity of the end portion, is mounted on the back surface, As a At the position, the opening 12c is placed on the FUP 11 from the frame F side, and the front end of the fixing portion 12a is in contact with the back surface of the curved portion of the FUP 11, and the base end side of the fixing portion 12a (the bolt hole 12d A clearance is provided between the inner surface of a certain side) and the FUP 11, and the periphery of the fixing portion 12a and the mounting portion 12b is fixed by welding or the like W. Next, the FUP 11 having the reinforcing and connecting members 12 attached to the left and right sides is fixed to the tip 2a of the support arm 2 with bolts (not shown).
[0014]
In this case, when the width of the frame F, that is, the mounting width of the support arm 2 is different depending on the vehicle, or the curvature of the side of the FUP 11 is different, the left and right distances are changed to B1 and B2, as shown in FIG. In particular, the reinforcing and connecting member 12 does not change the state in which the distal end of the fixing portion 12a is in contact with the inside of the curved portion of the FUP 11, but simply the inner surface on the base end side (the side with the bolt hole 12d) of the fixing portion 12a. The gap with the FUP 11 only changes somewhat, and there is almost no change in the reinforcing state described later.
[0015]
In the structure of the present invention configured as described above, when the impact load P1 is applied to the FUP 11, as described above, the fixing portion 12a contacting the FUP while being strongly received near the tip of the fixing portion 12a of the reinforcing and connecting member 12 is applied. In addition, the stress is concentrated on the entire fixing portion 12a without being concentrated from the fixing portion 12a and the mounting portion 12b having a long weld line. At this time, since a gap is provided between the inner surface of the fixing portion 12a on the base end side (the side with the bolt hole 12d) and the FUP 11, the FUP 11 is reinforced by the reinforcing and connecting member 12 but in the vicinity of the center of the FUP 11. The applied force is released and deformation near the center of the FUP 11 is prevented.
The impact force input to the fixed portion 12a is transmitted to the tip of the support arm 2 through the bolt. Therefore, the load is smoothly transmitted to the frame F through the support arm 2 without causing stress concentration.
[0016]
【The invention's effect】
In the reinforcing and connecting structure of the FUP of the present invention , on the back surface of the FUP having a curved portion that curves in the direction of the back surface in the vicinity of the end portion, the FUP conforms to the curved portion shape of the FUP and is attached closely to the FUP when assembled. A fixed portion to the track frame F having a U-shaped cross section, a mounting portion to the upper and lower surfaces of the FUP extending integrally from the fixed portion while being obliquely shifted in one direction, and formed on the side opposite to the tip portion of the fixed portion. Two reinforcing and connecting members having openings are arranged symmetrically with respect to the center in the longitudinal direction, and the distal end of the fixed part is FUP so that the openings face each other at a position where the FUP linear part changes to a curved part. The fixing portion and the mounting portion are welded to the FUP, and the fixing portion is connected to the chassis frame while reinforcing the FUP via a support arm. Since the said by using a reinforcing and connecting member, is input to the fixed portion contacting while being strongly received in the vicinity of the front end of the fixed portion of the reinforcing and connecting member to the FUP, also has a long weld line It can be input to the fixed portion and the mounting portion while being dispersed without stress concentration from the mounting portion , and at this time, it is applied near the center of the FUP due to a gap provided between the inner surface of the base end side of the fixing portion and the FUP. The force is released and deformation near the center of the FUP is prevented. Then, the impact force relaxed as described above and input to the fixed portion is transmitted from the fixed portion to the tip of the support arm. Therefore, the load can be smoothly transmitted to the frame without causing stress concentration.
[0017]
Further, the manufacturing method of the reinforcing and connecting member of the FUP of the present invention is such that when the reinforcing and connecting member is deployed in the width plate, the fixing portion to the track frame having a predetermined width in the center in the width direction is provided on both sides thereof. Integrally, an attachment portion to the upper and lower surfaces of the FUP that is obliquely displaced in one direction from the fixing portion and reaches the end surface of the width plate is formed, and on the opposite side of the tip of the fixing portion, the fixing portion and It is characterized by forming recesses of the same shape and allowing the material of the reinforcing and connecting member to be removed continuously from the width plate. There is also an effect that can be performed.
[0018]
In the case of taking the material of the reinforcing and connecting member of the present invention as described above, the fixing portion to the frame and the concave portion formed on the opposite side thereof have the same shape. It is easy and the cost can be reduced.
[0019]
Load bearing performance test result of the coupling device FUP using a conventional connecting member shown in FIG. 7 with respect to (6), load-bearing performance test of the reinforcing and connecting structure FUP with reinforcing and connecting member of the present invention FUP The result is as shown in FIG.
[Brief description of the drawings]
[1] The present invention FUP perspective view the present invention; FIG FUP reinforcing and connecting member in the reinforcing and connecting structure perspective view [FIG 3] This invention FUP of a main part of the reinforcing and connecting structure of the reinforcement and connection structure of a plan view showing the material up to 4 shows another plan view of a main part showing a use example [5] load bearing performance test result of reinforcing and connecting structure of the present invention FUP reinforcing and connecting structure of the present invention FUP Figure 7 is a perspective view of a main part of the connecting structure of the conventional FUP shown Figure 6 the load bearing performance test results of the connection structure of the conventional FUP shown.
[Explanation of symbols]
1, 1 ', 11 Front underrun protector (FUP) , 2 Support arm 2a (Support arm) tip 3 (Conventional) connection member 12 Reinforcement and connection member 12a (Reinforcement and connection member) fixing part 12b (Same) Mounting part 12c (same) Opening part 12d Bolt hole 12e Hole 13 for light weight Width plate F Frame P1 Impact load W Welding.

Claims (2)

On the back surface of the front under-run protector having a curved portion that curves in the direction of the back surface near the end portion, a U-shaped cross section that fits the curved portion shape of the protector to the front under-run protector at the time of assembly and that the tip portion is in close contact with. A fixing portion to the track frame, a mounting portion on the upper and lower surfaces of the front underrun protector extending integrally from the fixing portion obliquely in one direction, and an opening formed on the opposite side of the tip portion of the fixing portion The front and rear ends of the fixing portion are arranged so that the opening portions face each other at a position where the reinforcing and connecting members of the two front underrun protectors having the symmetric shape are shifted from the straight portion to the curved portion of the protector symmetrically about the longitudinal center. The part is brought into close contact with the front underrun protector, and the mounting portion is placed on the upper and lower surfaces of the front underrun protector to fix the front underrun protector. And allowed welded attachment portion to the front underrun protector, the by fixing portion via a supporting arm, the reinforcement and connection structure of the front underrun protector, characterized in that connected to the chassis frame while reinforcing the front underrun protector. When the reinforcing and connecting member is deployed in the width plate, the fixing portion to the track frame having a predetermined width in the center in the width direction is shifted obliquely in one direction from the fixing portion integrally with both sides thereof. Mounting portions to the upper and lower surfaces of the front under-run protector that reach the end surface of the width plate, and a recess having the same shape as the fixed portion is formed on the opposite side of the front end of the fixed portion. A method for producing a reinforcing and connecting member for a front underrun protector, wherein the material for the reinforcing and connecting member can be continuously taken.

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