JP6656582B2 - Anti-vibration structure of underrun protector - Google Patents

Description

  The present invention relates to an anti-vibration structure for an underrun protector.

  A structure is known in which a front underrun protector (FUP) is disposed under a front end of a body frame of a large vehicle in order to prevent the vehicle from sneaking under the large vehicle when the large vehicle such as a truck collides with the passenger vehicle. I have.

  Patent Document 1 discloses that in order to improve the load bearing performance of the entire front underrun protector, one end of a reinforcing rod is attached to an end surface of a stabilizer bracket attached to a vehicle body frame, and the other end of the reinforcing rod is attached to the front underrun protector. A structure attached to an end surface near the end of the UP body is described.

JP-A-2004-352101

  In the structure of Patent Document 1, both ends in the vehicle width direction of the underrun protector (UP main body) are connected to the vehicle body frame side by stays and reinforcing rods. Not connected to the body frame. For this reason, the center part of the underrun protector, which is a long member, in the vehicle width direction may vibrate significantly during traveling of the vehicle.

  Therefore, an object of the present invention is to provide an anti-vibration structure capable of efficiently suppressing vibration of an underrun protector during running of a vehicle.

  In order to achieve the above object, an anti-vibration structure of an underrun protector according to a first aspect of the present invention includes a pair of left and right UP brackets and an anti-vibration rod. The body frame of the vehicle provided with the underrun protector has a pair of left and right side members and a cross member. The left and right side members extend in the front-rear direction on both sides in the vehicle width direction, and the cross members extend in the vehicle width direction at one end in the front-rear direction of the vehicle and connect one end of the left and right side members. I do. The underrun protector extends in the vehicle width direction below the cross member.

The left and right UP brackets are fixed to the above-mentioned one end of the left and right side members, and respectively support the left and right ends of the underrun protector. The anti-vibration rod connects the cross member and a central portion of the underrun protector in the vehicle width direction. The underrun protector has longitudinal surfaces on one side and the other side which are separated from each other in the front-rear direction and substantially in the entire vehicle width direction. At the left and right ends of the underrun protector, the vertical surface on the other side is fixed to the UP bracket in a state of being in surface contact with the UP bracket from one side in the front-back direction. At the center of the underrun protector in the vehicle width direction, a vibration isolating rod is coupled to one vertical surface.
The cross member and the central portion of the underrun protector in the vehicle width direction may be connected by left and right anti-vibration rods. The left and right anti-vibration rods extend obliquely in the left and right directions from the cross member side to the underrun protector side so as to form a substantially isosceles triangle with the bottom in the vehicle width direction center of the underrun protector. You may.

  In the above configuration, since the vibration isolating rod connects the central portion of the underrun protector supported by the left and right UP brackets and the cross member, vibration of the central portion of the underrun protector, which tends to increase in amplitude during traveling of the vehicle, is prevented. The vibration can be suppressed by the swing rod, and the vibration of the entire underrun protector can be efficiently suppressed.

  A second aspect of the present invention is the vibration-damping structure according to the first aspect, wherein the vibration-isolating rod is a tubular metal pipe having one end and the other end crushed in a flat plate shape. And the other end are respectively coupled to the cross member and the underrun protector.

  In the above configuration, the rod body between the one end and the other end is a metal circular pipe having a relatively large section modulus and second moment of area, and the rod body is integrally formed with the one end and the other end. Therefore, the vibration of the central portion of the underrun protector can be more reliably suppressed by the vibration-proof rod.

  ADVANTAGE OF THE INVENTION According to this invention, the vibration of an underrun protector during vehicle running can be suppressed efficiently.

1 is an external perspective view of a vehicle including an attachment structure according to an embodiment of the present invention. It is the perspective view which looked at the principal part of the vehicle of FIG. 1 from diagonally lower front. FIG. 3 is a sectional view taken along the line III-III in FIG. 2.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The arrow FR in the figure indicates the front of the vehicle 1, UP indicates the upper side, and IN indicates the inner side in the vehicle width direction. Further, in the following description, the front-rear direction refers to the front-rear direction of the vehicle 1, and the left-right direction refers to the left-right direction in a state where the vehicle 1 faces forward.

  As shown in FIG. 1, a vehicle 1 according to the present embodiment is a cab-over type vehicle in which a cab 30 is located generally ahead of an engine (not shown). As shown in FIGS. 1 to 3, a body frame 2 of the vehicle 1 includes a pair of left and right side members (only the left side is shown in FIG. 1, only the right side is shown in FIGS. 2 and 3) and , A plurality of cross members (only the frontmost first cross member 4 is shown in FIG. 2). The left and right side members 3 are separated from each other on both sides in the vehicle width direction and extend in the front-rear direction. The first cross member 4 extends linearly in the vehicle width direction between the front ends of the left and right side members 3 and connects the front ends of the left and right side members 3.

  As shown in FIGS. 2 and 3, an FUP (Front Underrun Protector) 10 as an underrun protector extends obliquely below the first cross member 4 (below the front end of the vehicle 1) in the vehicle width direction. It is fixed to the side member 3 while being supported from the rear side (other side) by an UP bracket (underrun protector bracket) 11 on both left and right sides in the direction. Since the left and right side members 3 and the UP bracket 11 have the same configuration, the right side will be described below and the left side description will be omitted.

  The side member 3 has a U-shaped cross section that opens inward in the vehicle width direction. The side member 3 stands substantially vertically and extends in the front-rear direction. And an upper plate portion 22 and a lower plate portion 23 which face each other.

  The first cross member 4 has a U-shaped cross section that opens rearward, and is bent substantially rearward from a vertical wall portion 24 that stands substantially vertically and extends in the vehicle width direction, and upper and lower edges of the vertical wall portion 24. An upper wall portion 25 and a lower wall portion 26 facing each other are integrally provided. The left and right ends of the first cross member 4 are inserted between the upper plate portion 22 and the lower plate portion 23 of the front end of the side member 3, and the upper wall portion 25 of the first cross member 4 is connected to the upper plate of the side member 3. The upper wall portion 25 and the upper plate portion 22 are fastened and fixed from above and below while overlapping the portion 22 from below, and the lower wall portion 26 of the first cross member 4 is attached to the lower plate portion 23 of the side member 3 from above. In the overlapping state, the lower wall portion 26 and the lower plate portion 23 are fastened and fixed from above and below.

  The FUP 10 is a rectangular tubular body formed by combining two channel materials, and has an upper surface portion 12, a lower surface portion 13, a front surface portion 14, and a rear surface portion 15 integrally. The UP bracket 11 has a bracket main body 16 and an UP support plate 17 integrally, and the bracket main body 16 is fastened and fixed to the lower surface of the lower plate 23 of the side member 3 and extends downward. The UP support plate 17 is fixed to a lower portion of the front surface of the bracket body 16. The rear surface portion 15 of the FUP 10 is joined to and supported by the UP support plate portion 17 in a state of being in front contact with the front surface of the UP support plate portion 17 from the front.

  A rod connecting bracket 31 is fixed to a center portion of the first cross member 4 in the vehicle width direction. The rod connection bracket 31 is an L-shaped bent metal plate, and has a flat vehicle-body-side connecting portion 32 and a flat-plate upper rod-connecting portion that extends from one end edge of the vehicle-body-side connecting portion 32 at a substantially right angle. 33 integrally. The vehicle-body-side connecting portion 32 is superposed on the lower wall portion 26 of the first cross member 4 from below, and is brought into surface contact with the lower surface of the lower wall portion 26. The bolt 34 is inserted through a bolt insertion hole (not shown), and a nut 35 is screwed into the bolt 34 to be fastened and fixed to the lower wall portion 26. In this state, the upper rod connecting portion 33 extends from the front edge of the vehicle body side connecting portion 32 by bending downward. The front surface of the upper rod connecting portion 33 has a flat surface shape substantially orthogonal to the front-rear direction.

  The front portion 14 at the center of the FUP 10 in the vehicle width direction forms a lower rod connecting portion 36. The front surface of the lower rod connecting portion 36 (the central portion of the front portion 14 in the vehicle width direction) has a flat surface substantially orthogonal to the front-rear direction.

  The upper rod connecting portion 33 and the lower rod connecting portion 36 are connected by two left and right anti-vibration rods 40L and 40R having substantially the same shape. The anti-vibration rods 40L and 40R are cylindrical metal pipes whose one end 41 and the other end 42 are crushed in a flat plate shape, and a tubular rod body 43 is inserted between the one end 41 and the other end 42. Have. The one end portion 41 is formed on the one end portion 41 and the upper rod connection portion 33 in a state where the one end portion 41 is overlapped from the front with the front surface of the upper rod connection portion 33 of the rod connection bracket 31 from the front, and is inserted through the front and rear direction. A bolt 44 is inserted through a hole (not shown), and a nut 45 is screwed into the bolt 44 to be fastened and fixed to the upper rod connecting portion 33. The other end portion 42 is formed on the other end portion 42 and the lower rod connecting portion 36 in a state of being overlapped from the front with the front surface of the lower rod connecting portion 36 of the FUP 10 from the front and in contact therewith, and a bolt insertion hole penetrating in the front-rear direction. The bolt 46 is inserted into a bolt (not shown), and a nut 47 is screwed into the bolt 46 to be fastened and fixed to the lower rod connecting portion 36. Thus, the first cross member 4 and the central portion of the FUP 10 in the vehicle width direction are connected by the vibration isolating rods 40L and 40R.

  Since the front surface of the lower rod connecting portion 36 is disposed behind the front surface of the upper rod connecting portion 33, the rod body 43 extends obliquely downward and rearward, and the one end 41 and the other end 42 are The rod body 43 is bent substantially vertically from the upper end and the lower end. The left and right rod connecting positions (bolt insertion holes) of the upper rod connecting portion 33 are arranged close to each other, and the left and right rod connecting positions (bolt insertion holes) of the lower rod connecting portion 36 are connected to the upper rod connecting portion 33. The left and right rod bodies 43 are inclined outward from the one end 41 toward the other end 42 and extend in the vehicle width direction. The anti-vibration rods 40L and 40R and the lower rod connecting portion 36 form a substantially isosceles triangle having the lower rod connecting portion 36 as a bottom side (lower side).

  According to the present embodiment, since the vibration isolating rods 40L and 40R connect the central portion of the FUP 10 supported by the left and right UP brackets 11 and the cross member 4, the central portion of the FUP 10 whose amplitude tends to increase during traveling of the vehicle. Can be suppressed by the anti-vibration rods 40L and 40R, and the vibration of the entire FUP 10 can be efficiently suppressed.

  The rod main body 43 of the vibration isolating rods 40L and 40R is a metal pipe having a relatively large section modulus and second moment of area, and the one end 41 and the other end 42 are integrally formed with the rod main body 43. Vibration at the center of the FUP 10 can be more reliably suppressed by the vibration isolating rods 40L and 40R.

  In addition, since the one end 41 of the vibration-proof rods 40L and 40R is fixed to the first cross member 4 via the rod connecting bracket 31, the workability of connecting the one end 41 is improved.

  In the above-described embodiment, the upper rod connecting portion 33 and the lower rod connecting portion 36 are connected by the two anti-vibration rods 40L and 40R. However, the number of anti-vibration rods is not limited to this, and one or three anti-vibration rods are used. It may be the above.

  Further, the rod connecting bracket 31 may be omitted, and the one end 41 of the vibration-proof rods 40L, 40R may be directly fixed to the first cross member 4. Alternatively, the rod connecting bracket may be fixed to the FUP 10, and the other end portions 42 of the vibration isolating rods 40L and 40R may be connected to the rod connecting bracket.

  The cross-sectional shape of the anti-vibration rods 40L and 40R is not limited to a hollow tubular body, and can be arbitrarily set, such as a solid rod-shaped body. May be fixed by welding or the like.

  In the above embodiment, the first cross member 4 and the FUP 10 are connected by the vibration isolating rods 40L and 40R. However, the rear underrun is provided below the end cross member (not shown) connecting the rear ends of the left and right side frames 3. In the structure in which the protector 50 (see FIG. 1) is arranged, the end cross member and the rear underrun protector 50 may be connected by a vibration isolating rod as in the case of the front end of the vehicle 1.

  As described above, the embodiment to which the invention made by the present inventor is applied has been described. However, the present invention is not limited by the description and the drawings that constitute a part of the disclosure of the present invention by this embodiment. That is, other embodiments, examples, operation techniques, and the like performed by those skilled in the art based on this embodiment are all included in the scope of the present invention.

  The anti-vibration structure of the underrun protector according to the present invention can be widely used for vehicles such as trucks.

Reference Signs List 1 vehicle 2 body frame 3 side member 4 first cross member 10 FUP (front underrun protector)
11 UP bracket 14 Front part of FUP 26 Lower wall part of first cross member 31 Rod connection bracket 32 Body side connection part 33 Upper rod connection part 36 Lower rod connection part 40L, 40R Anti-vibration rod 41 One end of anti-vibration rod 42 Prevention The other end of the swing rod 43 Rod body 50 Rear underrun protector

Claims (2)

A pair of left and right side members extending in the front-rear direction on both sides in the vehicle width direction, and one end of the left and right side members extending in the vehicle width direction at one end in the front-rear direction of the vehicle And a cross member connecting the parts of the underrun protector provided in the vehicle and extending in a vehicle width direction below the cross member,
A pair of left and right UP brackets fixed to the one end of the left and right side members and supporting left and right ends of the underrun protector, respectively;
An anti-vibration rod that connects the cross member and a central portion of the underrun protector in the vehicle width direction ,
The underrun protector has a longitudinal surface portion on one side and the other side facing each other while being separated in the front-rear direction in substantially the entire area in the vehicle width direction,
At the left and right ends of the underrun protector, the other vertical surface portion is fixed to the UP bracket in a state of being in surface contact with the UP bracket from one side in the front-rear direction,
An anti-vibration structure for an underrun protector , wherein the anti-vibration rod is coupled to the one vertical surface at a central portion in the vehicle width direction of the underrun protector. The anti-vibration structure according to claim 1,
The cross member and a central portion in the vehicle width direction of the underrun protector are connected by the left and right anti-vibration rods,
The left and right anti-vibration rods are respectively formed in the left and right directions from the cross member side toward the underrun protector side so as to form a substantially isosceles triangle having a bottom in a vehicle width direction central portion of the underrun protector. An anti-vibration structure for an underrun protector characterized by being inclined and extending .

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