WO2019065272A1

WO2019065272A1 - Vehicular protector member

Info

Publication number: WO2019065272A1
Application number: PCT/JP2018/033972
Authority: WO
Inventors: センティビナーヤガムチャンドラセカラン
Original assignee: ダイムラー・アクチェンゲゼルシャフト; 三菱ふそうトラック・バス株式会社
Priority date: 2017-09-29
Filing date: 2018-09-13
Publication date: 2019-04-04
Also published as: JP6725468B2; JP2019064418A

Abstract

[Problem] To provide a vehicular protector member that stays strong, suppresses production costs, and contributes to weight reduction. [Solution] A protector member 7 that comprises a single metal plate 13 that has been bent multiple times. The protector member has: a hollow member 15 that comprises a first surface 17a that faces the center side of a vehicle, a second surface 17b that faces the first surface, a third surface 17c that connects the first surface and the second surface on a vehicle height direction top side, and a fourth surface 17d that connects the first surface and the second surface on a vehicle height direction bottom side; and an intermediate plate 17e that is provided between the first surface and the second surface. The hollow member comprises a vehicle width direction center region α, a vehicle width direction end part region β, and a middle region γ that is between the center region and the end part region and is connected to the vehicle. The intermediate plate connects the first surface and the second surface in the middle region.

Description

Vehicle protector member

The present invention relates to a vehicle protector member disposed at the front-rear direction end of a vehicle.

In vehicles with a large height, such as large buses and truck vehicles, protector members (underrun protectors) are attached to the front and rear ends of the chassis frame to prevent the passenger car from getting into the space between the chassis frame and the road surface. .
A hollow member is used for such a protector member. Recently, as disclosed in Patent Document 1, in order to improve the strength of the hollow member, reinforcement is performed by a method of providing an intermediate plate inside the hollow member.

JP 2003-276535 A

Not only the strength but also the manufacturing cost and weight reduction of the protector member are regarded as important.
However, the hollow member provided with the above-described midplate is generally manufactured by casting, which increases the manufacturing cost. Moreover, because the weight of the hollow member itself is increased, there is a risk that the fuel efficiency of the vehicle may deteriorate and the loadable amount of the truck may decrease.

Therefore, an object of the present invention is to provide a vehicle protector member that can suppress the manufacturing cost and contribute to the weight reduction of the protector member while maintaining the strength of the protector member.

An aspect of the present invention is a protector member made of a single metal plate that is disposed along the vehicle width direction at the front-rear direction end of the vehicle and bent a plurality of times, and is made of a metal plate and is located on the center side of the vehicle A first surface facing the first surface, a second surface facing the first surface, a third surface connecting the first surface and the second surface at the upper side in the vehicle height direction, and the first surface A hollow member extending in the vehicle width direction, comprising a fourth surface connecting the second surface at the lower side in the vehicle height direction, and an end of a metal plate, the first surface and the second surface An intermediate plate provided between and extending in the vehicle width direction, the first surface or the third surface of the hollow member being connected to the vehicle, and the hollow member being a central region in the vehicle width direction; When comprising an end area and an intermediate area which is between the central area and the end area and connected to the vehicle, the intermediate plate has a first surface and a second surface in the intermediate area. It was assumed to be continuous and the surface.

That is, the area connected to the connection member in the vehicle width direction of the hollow member is a portion regarded as the most important as a portion receiving the impact load.
Therefore, the hollow member is divided into a central region in the vehicle width direction, an end region in the vehicle width direction, and an intermediate region connected to the vehicle between the central region and the end region, and disposed in the hollow member In the intermediate region, only the first surface on the vehicle body side and the second surface on the opposite side are provided continuously, and only the region connected to the vehicle by the intermediate plate is reinforced. Thereby, the strength of the protector member is maintained properly.
In addition, since the hollow member is a single metal plate bent a plurality of times and has a cylindrical shape having an intermediate plate inside and extending in the vehicle width direction, the manufacturing cost is lower than that by casting. . Besides, weight reduction can be achieved.

Preferably, the central region and the two end regions of the intermediate plate have notches. Thereby, weight reduction is advanced without affecting the processing of the hollow member.
Preferably, the intermediate plate has a trapezoidal shape. As a result, since both end sides in the vehicle width direction of the intermediate plate are gradually deformed when an impact load at the time of impact is applied, the shock absorption property of the protector member is increased.
Preferably, the corner of the intermediate plate is arc-shaped. As a result, the intermediate plate gradually deforms from the corner when an impact load is applied at the time of impact, so that the shock absorption of the protector member is further enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the protector for vehicles attached to the vehicle used as the aspect which concerns on the 1st Embodiment of this invention. The perspective view which partially cut out which shows the hollow member which comprises the protector for the vehicles. Sectional drawing in the intermediate region of the hollow member which follows the AA in FIG. Sectional drawing in the edge part area | region of the hollow member which follows the BB line in FIG. The perspective view which shows the single metal plate which comprises a hollow member. Sectional drawing explaining the process in which a hollow member is formed by several bending | flexion of the single metal plate. The perspective view which notched one part of the protector for vehicles which shows the aspect which concerns on the 2nd Embodiment of this invention. The perspective view which notched one part of the protector for vehicles which shows the aspect which concerns on the 3rd Embodiment of this invention. Sectional drawing which shows the aspect which concerns on the 4th Embodiment of this invention.

Hereinafter, the present invention will be described based on a first embodiment shown in FIGS. 1 to 6.
FIG. 1 shows a commercial vehicle (vehicle) such as a truck intended for transportation, for example, and 1 in FIG. 1 shows a chassis frame of the vehicle. The chassis frame 1 has a ladder structure in which a pair of side rails 3 extending in the longitudinal direction of the vehicle and a cross member (not shown) extending in the vehicle width direction are combined. A cabin and a power unit (both not shown) are mounted on the front of the vehicle of the chassis frame 1, and a packing box 5 is mounted on the rear of the vehicle.

The vehicle protector member 7 (underrun protector: at least one of the vehicle-direction end of the chassis frame 1, specifically at least one of the front end and the rear end of the side rail 3) is an end in the longitudinal direction of the vehicle. Hereinafter, only the protector is provided. Only the protector member 7 at the rear end of the vehicle is shown in FIG. These protectors 7 are disposed along the vehicle width direction, and prevent a passenger car or the like from getting into between the chassis frame 1 and the road surface (not shown).
The same structure is adopted for these protectors 7 for the front and rear of the vehicle. For this reason, in the present embodiment, the protector 7 disposed at the rear end of the vehicle will be described.

That is, as shown in FIGS. 1 and 2, the protector 7 is a component extending along the vehicle width direction of the vehicle. The protector 7 is fixed to the tips of a pair of stays 9 protruding downward from the rear end of the side rail 3. Incidentally, for the pair of stays 9, a component having a mounting seat 10 extending in the vehicle rear direction and extending in the vehicle height direction at the extension end is used. The protector 7 is assembled to a mounting surface of the mounting seat 10 facing the rear of the vehicle.

The protector 7 is required to properly maintain strength, to be inexpensive in manufacturing cost, to be lightweight, and the like.
Therefore, the protector 7 mainly includes the hollow cylindrical hollow member 15 formed by bending a single metal plate 13 as shown in FIGS. 5 and 6 a plurality of times. A structure for securing strength properly and a structure for reducing weight are used.

That is, the hollow member 15 which becomes the main part of the protector 7 is comprised, for example by roll forming process. For example, as shown in FIG. 5, the hollow member 15 is provided with a plurality of bending lines 13a extending in the longitudinal direction at predetermined positions of a single rectangular metal plate 13 by a roll forming machine (not shown). It is molded in a molding process. Specifically, for example, as shown in FIGS. 6 (a) to 6 (e), the hollow member 15 bends one end 14a of the metal plate 13 according to the bending line 13a, and stands up. Then, from this state, the remaining metal plate 13 is bent a plurality of times while being rolled according to the bending line 13a, and finally, the other end portion 14b is erected and formed. In FIG. 6 (e), reference numerals indicating first to fourth surfaces 17a to 17d to be described later are attached.

Thereby, as shown in the perspective view of FIG. 2, the cross-sectional view of FIG. 3 (line AA in FIG. 2), and the cross-sectional view of FIG. 4 (line BB in FIG. 2). It can be disposed at the vehicle body end, and is configured in a rectangular tube shape in which the end 14 a of the metal plate 13 is disposed in the hollow portion. Specifically, as shown in FIGS. 2 to 4, the hollow member 15 has a left side wall facing the center side of the vehicle as a first surface 17 a and an opposite right side wall facing the first surface 17 a. The second surface 17b, the upper wall is the third surface 17c connecting the first surface 17a and the second surface 17b at the upper side in the vehicle height direction, and the lower wall is the first surface 17a and the second surface The end surface 14a of the metal plate 13 is an intermediate plate 17e disposed between the first surface 17a and the second surface 17b. It is configured in a square tube shape. The intermediate plate 17e extends in the vehicle width direction at an intermediate position between the third surface 17c and the fourth surface 17d. Incidentally, the end 14a of the metal plate 13 forming the intermediate plate 17e is joined to the second surface 17b by welding, and the end 14b of the metal plate 13 forming the first surface 17a is at the corner of the intermediate plate 17e. It is joined. Reference numeral 18 in FIGS. 3 and 4 indicates the joint portion.

Further, as shown in FIG. 2, a plurality of, for example, four bolt insertion holes 19a are provided at the center in the vehicle width direction of the first surface 17a, that is, on the left side wall facing the mounting seat 10 of the stay 9 of the vehicle. Further, on the inner surface of the left side wall, a nut 19b (corresponding to a connecting member of the present application) is provided in communication with each bolt insertion hole 19a. That is, as shown in FIGS. 2 and 3, the first surface 17 a of the hollow member 15 is configured to be fastened (connected) to the stay 9 on the vehicle side by screwing the bolt 20. Thus, the hollow member 15 is assembled to the rear end of the vehicle along the vehicle width direction. The openings at both ends of the hollow member 15 are closed by the cover 21 (FIG. 1).

The hollow member 15 is a portion where the strength is required for the area where the stay 9 is connected in the vehicle width direction.
Therefore, as shown in FIG. 2, the hollow member 15 has a central region α in the vehicle width direction (a region between the stays 9 and 9), end regions β at both ends in the vehicle width direction, a central region α and an end It can be divided into a bearing surface 22 on which a nut 19b is disposed and a region continuous with the region β in the longitudinal direction of the vehicle, that is, an intermediate region γ connected with the nut 19b whose strength is required.

In order to ensure the strength of the hollow member 15 appropriately, the intermediate plate 17e, which is a reinforcing member, is provided so as to continue between the first surface 17a and the second surface 17b only in the intermediate region γ. Specifically, the intermediate plate 17e is configured to reinforce only the intermediate region γ where the strength is required most, and it is assumed that most of the intermediate plate 17e does not exist in the other regions where there is no problem in the strength. That is, the hollow member 15 is configured such that the largest strength is given in the middle region γ in which the middle plate 17e is disposed, and the strength decreases as it goes to the vehicle width direction end side. Thereby, the hollow member 15 is appropriately given strength.

Further, the intermediate plate 17e is formed in a trapezoidal shape which is slightly tapered from the first surface 17a to the second surface 17b (plan view in FIG. 2). Incidentally, in the present embodiment, a trapezoidal intermediate plate 17e having an oblique side 14c inclined at 45 ° is used. By this intermediate plate 17 having a trapezoidal shape, a region 有る with the oblique side 14c is a portion which is gradually deformed by an applied impact load. The corner 17x of the trapezoidal intermediate plate 17e has an arc shape so that this deformation mode can be appropriately exhibited.

The central area α and the end area β of the intermediate plate 17e do not have a structure in which only the intermediate plate 17e is eliminated, leaving the vicinity of the bending line 13a as shown by the two-dot chain line in FIGS. It is made the notch 23 (equivalent to the notch of this application) which is notched. The notch 23 has a structure in which the strength and weight of the hollow member 15 can be adjusted without affecting the roll forming process for manufacturing the hollow member 15.

As described above, the protector 7 has the structure of the hollow hollow member 15 formed by bending the single metal plate 13 by bending, and the intermediate plate 17e formed by the end portion 14a of the metal plate 13 is most required. With the structure provided only in the middle region γ which is the portion to be formed, it is possible to reduce the weight and the manufacturing cost as compared with the case of manufacturing by casting. In addition, the strength and strength distribution required for the protector 7 can be easily maintained.

Therefore, the protector 7 of the present embodiment can maintain the strength appropriately, can suppress the manufacturing cost, and can contribute to weight reduction.
Moreover, since the central region α and the both end regions β of the intermediate plate 17e have the notch portion 23, weight reduction can be achieved without affecting the forming process for manufacturing the hollow member 15, that is, the roll forming process. be able to.

Moreover, by using the trapezoidal intermediate plate 17e, the hollow member 15 can provide the performance of gradually deforming to the applied impact load by utilizing the oblique side 14c of the trapezoidal shape. Shock absorption can be increased.

Further, the corner portion 17x of the trapezoidal intermediate plate 17e is formed into an arc shape, so that the intermediate plate 17e can be further gradually deformed from the corner portion 17x, thereby further increasing the shock absorption of the protector 7 It can be done.

FIG. 7 shows a second embodiment of the present invention.
In the present embodiment, the intermediate plate 17e disposed in the intermediate area γ is divided into an area a to which the stay 9 is connected and an area b existing between the area a and the end area γ. An opening 25 is provided in the region b.
In particular, the opening 25 is formed in such a size and position that it does not approach the seating surface 22, the tip of the intermediate plate 17 e or the corner of the hollow member 15 so as not to affect the strength and processability of the hollow member 15. Be done. In the present embodiment, a long hole extending in the vehicle width direction is provided as the opening 25.

When the opening 25 is provided in this manner, the protector 7 has the end area β with the smallest strength in the vehicle width direction end side, the area a where the seating surface 22 is disposed becomes the area with the largest strength, and these areas a The area b between the and the end area β is an area with an intermediate intensity.

As a result, the protector 7 is formed with an intensity distribution in which the intensity sequentially decreases from the position where the seat surface 22 is located toward the end in the vehicle width direction, so that the required strength can be effectively ensured. The size, shape, and number of the openings 25 may be any as long as they do not affect the strength and processability of the hollow member 15.

FIG. 8 shows a third embodiment of the present invention.
It is known that the end of the protector 7 is used as a step for lifting the driver's foot and lifting it to a loading box or the like.

Therefore, in the embodiment, in order to reduce the weight of the protector 7 while maintaining the elevating convenience of the driver, the elevating convenience is ensured in the end portion region β of the protector 7 having no problem in strength. For this purpose, the third surface 17c is provided with the opening 27 only in the fourth surface 17d. In the present embodiment, two large and small openings are used as the opening 27.

The formation of the opening 27 can further reduce the weight of the protector 7.
Of course, the second embodiment and the third embodiment may be combined.

FIG. 9 shows a fourth embodiment of the present invention.
This embodiment shows the case where the stay of a vehicle does not fix the side part of the protector 7, but fixes the upper part of the protector 7.
Specifically, in the present embodiment, as in the first embodiment, the nut 19 b (connection member) is provided on the first surface 17 a of the protector 7, and the stay 9 of the side fixing type using the first surface 17 a The nut 29b is provided on the third surface 17c of the protector 7 and fixed to the upper fixed stay 39 by the bolt 30 using the third surface 17c.
Even if such a structure is used, the protector 7 exhibits the same effect as that of the first embodiment.

However, in the second to fourth embodiments, the same parts as those in the first embodiment are given the same reference numerals, and the explanation thereof is omitted.
The present invention is not limited to the above-described first to fourth embodiments, and various changes may be made without departing from the scope of the present invention.

7 Protector (Protector member)
13 single metal plate 15 hollow member 17a first surface 17b second surface 17c third surface 17d fourth surface 17e intermediate plate 17x corner 19b nut (connection member)
23 Notch (notch)
α central region β end region γ intermediate region

Claims

A protector member comprising a single metal plate which is disposed along the vehicle width direction at a front end or a rear end of a vehicle and which is bent a plurality of times,
The first surface formed of the metal plate and facing the center side of the vehicle, the second surface facing the first surface, the first surface, and the second surface in the vehicle height direction A hollow member extending in the vehicle width direction, comprising: a third surface connected on the upper side; and a fourth surface connecting the first surface and the second surface on the lower side in the vehicle height direction;
And an intermediate plate which is an end portion of the metal plate, is provided between the first surface and the second surface, and extends in the vehicle width direction,
The first or third surface of the hollow member is connected to the vehicle,
When the hollow member includes a central region in the vehicle width direction, an end region in the vehicle width direction, and an intermediate region between the central region and the end region and connected to the vehicle, The protector member for a vehicle, wherein the intermediate plate connects the first surface and the second surface in the intermediate region.
The said intermediate | middle board has a notch in the said center area | region and the said both end area | regions, The vehicle protector member of Claim 1 characterized by the above-mentioned.
The said intermediate | middle board is trapezoid shape, The vehicle protector member of Claim 1 or Claim 2 characterized by the above-mentioned.
The vehicle protector member according to claim 3, wherein a corner of the intermediate plate is arc-shaped.