JP5824848B2 - Front underrun protector - Google Patents

Description

  The present invention relates to a front underrun protector of a vehicle, and more particularly to a collision energy absorption type front underrun protector.

  Generally, a large vehicle such as a truck is provided with a front under-run protector that prevents the small vehicle from entering under the host vehicle when it collides with a small vehicle such as a passenger car.

  Conventionally, as this front underrun protector, a rigid type front underrun protector in which a protector beam extending in the vehicle width direction is directly attached to a bracket fixed to the front lower part of a vehicle body frame is known (for example, see Patent Document 1). ).

  There is also known a collision energy absorption type front under-run protector in which a protector beam extending in the vehicle width direction is attached to a bracket fixed to a lower front portion of a vehicle body frame via an impact absorbing member (see, for example, Patent Document 2). ).

JP 2005-132160 A JP 2000-280841 A

  By the way, in the above-mentioned collision energy absorption type front under-run protector, the protector beam is attached to the bracket via the impact absorbing member, so that there is a possibility that the attachment strength at the time of collision cannot be sufficiently secured.

  In addition, when the above rigid type is changed to a collision energy absorption type front under-run protector, the design change becomes large and the development cost may increase.

  The present invention has been made in view of the above points, and an object thereof is to provide a collision energy absorption type front under-run protector that can easily be changed from a rigid type while ensuring the attachment strength of the protector beam. It is in.

  In order to achieve the above-described object, a front underrun protector according to the present invention includes a beam member that is attached to a lower front portion of a chassis frame via a bracket and extends in the vehicle width direction, and a front side of the beam member. And a plurality of impact absorbing members provided along the width direction.

  Further, the shock absorbing member may be arranged continuously along the vehicle width direction.

  The beam member extends in the vehicle width direction with a space behind the front bumper of the vehicle, and the shock absorbing member is interposed between the beam member and the front bumper. May be.

  The shock absorbing member is fixed to the front side surface of the beam member while closing the other end opening of the cylindrical portion, the head portion closing the one end opening of the cylindrical portion, and the cylindrical portion. It may have a bottom portion.

  Further, the vehicle is a cab-over type truck, and the beam member is disposed at both ends thereof adjacent to a lower portion of the cab door opening, and at least one of the both ends is a step for getting on and off the cab. May be attached.

  The shock absorbing member may be made of fiber reinforced plastic.

  According to the front underrun protector of the present invention, it is possible to ensure the mounting strength of the protector beam and to easily change the rigid type.

1 is a schematic perspective view showing a front underrun protector according to an embodiment of the present invention and a part of a vehicle to which the front underrun protector is applied. It is a typical perspective view showing the front underrun protector concerning one embodiment of the present invention. It is a typical perspective view showing a crush box of a front underrun protector concerning one embodiment of the present invention. It is a typical side view showing the front underrun protector concerning one embodiment of the present invention. It is a typical perspective view which shows the conventional collision energy absorption type front underlamp protector. It is a typical perspective view which shows the front underrun protector which concerns on other embodiment.

  Hereinafter, based on FIGS. 1-4, the front underrun protector which concerns on one Embodiment of this invention is demonstrated. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  As shown in FIG. 1, a front underrun protector 1 according to the present embodiment is provided at a front lower part of a chassis frame 11 of a cab-over type truck or the like (hereinafter referred to as a vehicle) 10, and includes a protector beam (beam member) 2 and A plurality of crash boxes (impact absorbing members) 3 and a pair of left and right cab getting-on / off steps 5 are provided. In FIG. 1, the components of the vehicle 1 other than those indicated by solid lines and broken lines are omitted for convenience of explanation.

  As shown in FIGS. 1 and 2, the chassis frame 11 includes a pair of left and right side rails 12 that extend in the front-rear direction, and a cross member 13 that spans the side rails 12 in the vehicle width direction. Upper ends of a pair of left and right brackets 4 that hold the protector beam 2 are fixed to the front side portion of the side rail 12 by welding or bolt fastening. Further, a beam fixing portion 4 a that holds the protector beam 2 is formed at the lower front portion of the bracket 4. The beam fixing portion 4a is positioned so as to be separated from the rear side surface of the front bumper 14 by a predetermined distance in a state where the upper end portion of the bracket 4 is fixed to the front side portion of the side rail 12 (see FIG. 1). .

  The protector beam 2 has its rear side attached and fixed to the beam fixing portion 4a of the bracket 4 by welding or bolt fastening. That is, the protector beam 2 extends in the vehicle width direction at a predetermined interval behind the front bumper 14 with the front side faced to the rear side face of the front bumper 14, and both end portions of the cab 15 It is arrange | positioned so that a door opening lower part may be adjoined (refer FIG. 1).

  The crash box 3 is made of fiber reinforced plastics (FRP), and a plurality (17 in this embodiment) are continuously arranged on the front side surface of the protector beam 2 along the vehicle width direction. . As shown in FIG. 3, the crash box 3 has a cylindrical cylindrical portion 3a, a head 3b that closes the front opening of the cylindrical portion 3a, and a rectangular flat plate whose one side is longer than the diameter of the cylindrical portion 3a. A bottom portion 3c that closes the rear opening of the cylindrical portion 3a is formed.

  As shown in FIG. 4, the bottom portion 3 c closes the rear opening of the cylindrical portion 3 a at the front plane portion, and the rear plane portion is fixed to the front side surface of the protector beam 2. Further, the head portion 3 b abuts on the rear side surface of the front bumper 14 in a state where the rear plane portion of the bottom portion 3 c is fixed to the front side surface of the protector beam 2. That is, the plurality of crash boxes 3 are interposed between the rear side surface of the front bumper 14 and the front side surface of the protector beam 2, and when the front bumper 14 receives an impact from the front during a collision, the cylinder portion It is comprised so that impact energy can be absorbed effectively by 3a being crushed backward. Note that the number of the crash boxes 3 is not necessarily limited to 17, and can be appropriately changed according to the size and shape of the protector beam 2.

  As shown in FIG. 1, the pair of left and right cab getting-on / off steps 5 are formed in a flat plate shape, and are fixed to both ends of the protector beam 2 adjacent to the lower part of the door opening of the cab 15 by welding or bolt fastening, respectively. Yes. That is, the step 5 for getting on and off the cab is provided at the lower part of the door opening of the cab 15, and is configured to function as a step when a driver or the like gets into the cab 15 or gets off the cab 15. .

  Hereinafter, the operation and effect of the front underrun protector 1 according to the present embodiment will be described.

  When the vehicle 10 collides with a small vehicle such as a passenger car, the front bumper 14 receives an impact from the front. The impact energy received by the front bumper 14 is effectively absorbed when the cylinder portions 3a of the plurality of crash boxes 3 continuously disposed along the vehicle width direction behind the front bumper 14 are crushed rearward.

  That is, the impact energy at the time of collision is absorbed by only two crash boxes 41 in the conventional front underrun protector 40 shown in FIG. 5, for example, but according to the front underrun protector 1 of the present embodiment, It is effectively absorbed by a plurality (17 in this embodiment) of crash boxes 3 continuously arranged in the vehicle width direction.

  Therefore, the impact energy at the time of the collision can be greatly reduced by the crash box 3 continuously arranged in the vehicle width direction, and the strong protector beam 2 directly attached to the bracket 4 is used to bring the opponent vehicle to the host vehicle. It is possible to effectively prevent the dive.

  Further, the strength of the strong protector beam 2 is secured directly to the beam fixing portion 4a of the bracket 4 at the rear side surface, so that the mounting strength to the chassis frame 11 is effectively ensured.

  That is, in the conventional type shown in FIG. 5, the protector beam 42 may fall off due to the deformation of the crash box 41 at the time of a collision with the opponent vehicle. However, according to the front underrun protector 1 of this embodiment, the protector beam 2 is securely held by the bracket 4 fixed directly.

  Therefore, it is possible to ensure the mounting strength of the protector beam 2 and to reliably prevent the protector beam 2 from dropping due to a collision with the opponent vehicle.

  In addition, when an existing rigid type front underrun protector that does not include an impact absorbing member is changed to the conventional type shown in FIG. 5, a major design change such as a change in the shape of the bracket 43 or the mounting structure of the protector beam 42 is required. Is required. On the other hand, when the existing rigid type is changed to the front under-run protector 1 of the present embodiment, it is possible only by continuously arranging a lightweight FRP crash box 3 on the front side surface of the protector beam 2.

  Therefore, an existing rigid type can be easily changed to a collision energy absorption type front underrun protector without increasing the development cost and weight.

  Further, in the front underrun protector 1 of this embodiment, the position of the protector beam 2 is retracted rearward of the vehicle by the stroke of the crash box 3 (the length of the cylindrical portion 3a) as compared with the conventional type of FIG. Yes. That is, since the left and right ends of the protector beam 2 are adjacent to the lower part of the door opening of the cab 15 when the protector beam 2 moves backward, the left and right ends of the protector beam 2 can be used as fixing portions of the cab getting-on / off step 5. .

  Therefore, it is not necessary to separately provide a member for fixing the cab getting-on / off step 5 to the vehicle, the number of parts can be effectively reduced, and the mounting strength of the cab getting-on / off step 5 can be improved. .

  In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably and can implement.

  In the above-described embodiment, the crush box 3 has been described as being formed in a cylindrical shape, but may be formed in a box shape as shown in FIG. 6, for example.

  In the above-described embodiment, the front underrun protector 1 has been described as being applied to a cab-over type truck. However, it can be widely applied to vehicles having a high vehicle height such as a bus.

  Further, the plurality of crash boxes 3 are not necessarily arranged continuously in the vehicle width direction, and may be arranged in a step shape with a predetermined interval.

  Further, the crash box 3 is not limited to FRP, and an elastic member such as rubber can be applied as long as it can absorb an impact.

1 Front underrun protector 2 Protector beam (beam member)
3 Crash box (shock absorbing member)
3a Tube portion 3b Head portion 3c Bottom portion 4 Bracket 5 Cab entry / exit step 10 Vehicle 11 Chassis frame 14 Front bumper

Claims (6)

A beam member attached to the front lower part of the vehicle chassis frame via a bracket and extending in the vehicle width direction;
A plurality of impact absorbing members provided along the vehicle width direction on the front side of the beam member;
With
The shock absorbing member includes a cylindrical portion, a head to close the entire opening at one end of the front side of the tubular portion, in Ri cylinder der being formed,
The front surface of the beam member is provided so as to be behind the front end of the chassis frame of the vehicle, and the front surface of the shock absorbing member is provided in front of the front end of the chassis frame of the vehicle. Underrun protector.   The front underrun protector according to claim 1, wherein the shock absorbing member is continuously arranged along the vehicle width direction. The beam member extends in the vehicle width direction with a space behind the front bumper of the vehicle,
The front underrun protector according to claim 1, wherein the shock absorbing member is interposed between the beam member and the front bumper. The shock absorbing member is
The front underrun protector according to any one of claims 1 to 3, further comprising a bottom portion that closes the other end opening of the cylindrical portion and is fixed to a front side surface of the beam member. The vehicle is a cab-over type truck,
5. The beam member according to claim 1, wherein both ends of the beam member are disposed adjacent to a lower portion of the cab door opening, and a step for getting on and off the cab is attached to at least one of the both ends. Front underrun protector.   The front underrun protector according to any one of claims 1 to 5, wherein the impact absorbing member is made of fiber reinforced plastic.

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