JP2010269663A - Mounting structure of front underrun protector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a front underrun protector for securing the survival space between a frame and the ground when a passenger car goes under a truck. <P>SOLUTION: In the mounting structure of the front underrun protector in which the front underrun protector 1 is mounted to the lower part of a front bumper through a pair of right and left mounting brackets 7 fixed to the frame 3 of the truck with bolts 11, an oblong hole 15 is provided on a rear side of the mounting brackets in a fore and aft direction of the frame, and a pin 17 inserted in the oblong hole is protruded and provided at the frame. When shock exceeding the reference upon head-on collision of the vehicle works on the front underrun protector, the bolts are cut to move the mounting bracket rearward by the dimension of the oblong hole, the mounting bracket of which the movement is regulated by a pin rotates around the pin as a center, the front side of the frame is moved upward on the reaction, and a stopper provided at the bracket abuts on the lower part of the frame moved upward, thus stopping the frame from dropping. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a structure for mounting a front underrun protector, and in particular, survives between a frame and the ground when a passenger car has slipped under a truck beyond the mounting position of the front underrun protector with an impact force that exceeds the expected level. The present invention relates to a structure for mounting a front underrun protector capable of securing a space.

  When a truck and a passenger car collide head-on, there is a possibility that the passenger car will get into the lower part of the truck.

  Therefore, as a collision safety device that prevents a crashed passenger car from getting into the lower part of the truck, it is now mandatory to equip a front underrun protector as disclosed in Patent Document 1 or Patent Document 2 below the front bumper. It was.

  The front underrun protector is a large part arranged in the entire vehicle width direction of the truck, and is made of, for example, a hollow steel material having a square closed cross-sectional shape. A stay is attached. A front underrun protector is bolted to the front ends of a pair of left and right mounting brackets protruding downward from the left and right side rails of the frame via the stay.

  The front underrun protector is required to have a strength capable of withstanding the load at the time of the collision because of the structure that receives the load at the time of the vehicle collision, and the amount of displacement after the collision is 400 mm or less from the front end of the vehicle.

JP 2003-276536 A JP 2000-272444 A

  However, when a passenger vehicle collides with a truck, if an impact force exceeding the assumption acts on the front underrun protector, that is, if an impact force exceeding the standard acts on the front underrun protector at the time of the collision, the front underrun protector or It has been pointed out that the mounting bracket may be destroyed, and the passenger car may further slip under the truck.

  The present invention has been devised in view of such circumstances, and when a passenger car gets under the truck beyond the mounting position of the front underrun protector with an impact force exceeding the assumption, it is between the frame of the truck and the ground. It is an object of the present invention to provide a mounting structure for a front underrun protector that can secure a living space.

  In order to achieve such an object, the invention according to claim 1 is directed to a front under mounting in which a front under-run protector is mounted below a front bumper via a pair of left and right mounting brackets fixed to a truck frame with bolts or rivets. In the mounting structure of the run protector, a stopper is formed on the mounting bracket, a long hole is provided on the rear side of the mounting bracket in the front-rear direction of the frame, and a pin through which the long hole is inserted protrudes from the frame. When the impact force exceeding the standard is applied to the front underrun protector during a frontal collision of the vehicle, the bolt or rivet is cut and moved rearward by the length of the long hole and the movement is restricted by the pin. The bracket rotates about the pin with the collision energy at the time of collision, and the front side of the frame moves upward due to the reaction force. Dynamic and, the stopper provided on the mounting bracket, in contact with the lower portion of the frame moves upwards, characterized in that to prevent dropping of the frame.

  According to a second aspect of the present invention, in the mounting structure for the front underrun protector according to the first aspect, the stopper is housed on the side surface of the mounting bracket so as to face the frame, and via an elastic member. It is biased outward, and with the rotation of the mounting bracket, it protrudes laterally by the elastic force of the elastic member and abuts on the lower part of the frame.

  According to the invention according to each claim, even if the passenger car goes over the mounting position of the front underrun protector under the truck with an impact force exceeding the assumption, the mounting bracket rotates with the collision energy at the time of collision, and the reaction force Since the front side of the frame is lifted upward and the stopper prevents the frame from falling, a living space is secured between the ground and the frame so that the passenger car is not crushed by the truck.

  Accordingly, the survival rate of the driver of the passenger car is increased, and the driver can be rescued promptly.

  According to the second aspect of the present invention, since the stopper quickly protrudes outward by the elastic force of the elastic member and comes into contact with the lower portion of the frame, it is possible to reliably prevent the frame from falling.

It is a whole perspective view of the attachment structure of the front underrun protector which concerns on one Embodiment of Claim 1 and Claim 2. It is a side view of the attachment structure of a front underrun protector. It is a fragmentary perspective view of the attachment structure of a front underrun protector. It is a whole perspective view inside a mounting bracket. It is explanatory drawing explaining the movement of a mounting bracket and a frame when the impact force exceeding a reference | standard at the time of a vehicle collision acts on a front underrun protector. It is explanatory drawing explaining a motion of the attachment bracket when a volt | bolt fractures | ruptures. It is explanatory drawing explaining the movement of a mounting bracket and a frame when the impact force exceeding a reference | standard at the time of a vehicle collision acts on a front underrun protector. It is explanatory drawing explaining the movement of a mounting bracket and a frame when the impact force exceeding a reference | standard at the time of a vehicle collision acts on a front underrun protector. It is a whole perspective view of a stopper. It is explanatory drawing of the attachment structure of a stopper. It is explanatory drawing explaining the motion of a stopper. It is a whole perspective view of the stopper rotated by the spring force of the leaf spring. It is a fragmentary perspective view of the attachment structure of the front underrun protector which shows the state where the frame was supported by the stopper. It is a front view of the attachment structure of the front underrun protector which shows the state where the frame was supported by the stopper. It is a whole perspective view of the attachment structure of the front underrun protector which shows the state where the frame was supported by the stopper. It is explanatory drawing explaining the state by which the living space was ensured between the ground and the flame | frame.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a mounting structure of a front underrun protector according to one embodiment of claims 1 and 2, wherein 1 is a front underrun protector made of a hollow steel material formed in a square closed cross-sectional shape. 1 to 3, the rear side of the front underrun protector 1 is bolted to a mounting plate 9 at the tip of a pair of left and right mounting brackets 7 protruding from the left and right side rails 5 of the frame 3 to the lower front. The front underrun protector 1 is mounted below the front bumper (not shown) of the truck.

  As shown in FIGS. 1 and 2, the left and right mounting brackets 7 are formed in an L shape when viewed from the side, and the upper portion of the side rail 5 is attached by two bolts 11 (or rivets) arranged in the front-rear direction of the side rail 5. It is fixed to the side surface 12.

  Further, as shown in the drawing, a protruding piece 13 having a U-shape protruding in the side view is provided on the upper portion of the mounting bracket 7 so as to protrude rearward, and the protruding piece 13 has a long hole coaxially with the two bolts 11. 15 is provided in the front-rear direction of the side rail 5. And the pin 17 which penetrates this long hole 15 is protrudingly provided by the side surface 12 of the side rail 5, and the impact force exceeding the reference | standard at the time of a vehicle collision acts on the front underrun protector 1 at the time of a vehicle collision. When the bolt 11 is cut, the mounting bracket 7 has a dimension to move backward.

  Then, as shown in FIGS. 5 and 6, when the passenger car 19 collides frontally with the front underrun protector 1 with an impact force exceeding the reference, the bolt 11 is completely cut as described above, and the mounting bracket 7 Is moved rearward by the size of the elongated hole 15 and the movement is restricted by the pin 17.

  Thus, the mounting bracket 7 whose rearward movement is restricted by the pin 17 is a moment force due to the impact force between the pin 17 and the front underrun protector 1 as shown in FIGS. The pin 17 is rotated in the direction of the arrow A around the rotation center. As shown in the figure, the front side of the frame 3 is lifted upward by the reaction force using the collision energy at the time of collision.

  Further, as shown in FIG. 4, a recess 23 is formed from the upper center to the lower part of the inner surface 21 of the mounting bracket 7 facing the side surface 12 of the side rail 5, as described above. A stopper 25 is provided to contact the lower part of the frame 3 (side rail 5) lifted upward to prevent the frame 3 from falling.

  9 to 12 show details of the stopper 25. In FIG. 9, reference numeral 27 denotes a shaft having a circular cross section that is rotatably mounted between the front and rear side walls 29, 31 of the recess 23 shown in FIG. The shaft 27 is inserted into the center of a pair of front and rear circular mounting flanges 33 and 35 provided at the lower part of the front and rear shafts to be fixed. 9 and 10, a leaf spring 37 having a U-shaped cross section for attaching the stopper 25 outward (side rail 5 direction) is attached to the outer periphery of the shaft 27 between the mounting flanges 33 and 35. When the mounting flange 7 is located at the normal mounting position shown in FIG. 1, the leaf spring 37 pressed by the stopper 25 and the back surface 39 of the recess 23 as shown in FIG. Is pressed against the side surface 12 of the side rail 5. As described above, when the mounting bracket 7 rotates in the direction of the arrow A around the pin 17 as shown in FIG. 7 and the front side of the frame 3 is lifted upward, the side as shown in FIGS. The stopper 25 released from the regulation by the rail 5 projects outward by a predetermined angle via the shaft 27 by the spring force of the leaf spring 39.

  Then, the frame 3 lifted upward tries to return downward, but as shown in FIGS. 13 to 15, the upper end 41 of the stopper 25 comes into contact with the lower portion of the side rail 5, and the dropped frame 3 is dropped. By blocking, a living space 45 is secured between the ground 43 and the frame 3 so that the passenger car 19 is not crushed as shown in FIG.

  As shown in FIG. 9, the upper end 41 of the stopper 25 has a shape inclined along the angle of the frame 3 (side rail 5) that is lifted and inclined.

  Since the present embodiment is configured as described above, when the passenger vehicle 19 collides with the front underrun protector 1 (truck) from the front with an impact force within the standard, the front underrun protector 1 receives this as in the conventional case. The passenger car 19 is prevented from creeping into the lower part of the truck.

  On the other hand, when the passenger car 19 collides frontally with the front underrun protector 1 with an impact force exceeding the reference as shown in FIG. 5, the bolt 11 fixing the mounting bracket 7 to the side rail 5 as shown in FIG. The mounting bracket 7 is moved rearward by the length of the long hole 15 and the movement is restricted by the pin 17.

  Thus, when the rearward movement is restricted by the pin 17, the mounting bracket 7 is caused by the impact force between the pin 17 and the front underrun protector 1 as shown in FIGS. 5, 7, and 8. The pin 17 is rotated in the direction of the arrow A by the moment force, and the front side of the frame 3 is lifted upward by the reaction force using the collision energy at the time of collision.

  Then, as shown in FIGS. 11 and 12, the stopper 25, which is released from the restriction by the side rail 5, protrudes outward by a predetermined angle through the shaft 27 by the spring force of the leaf spring 39.

  Then, the frame 3 lifted upward tries to return downward, but as shown in FIGS. 13 to 15, the upper end 41 of the stopper 25 comes into contact with the lower portion of the side rail 5, and the dropped frame 3 is dropped. By blocking, a living space 45 is secured between the ground 43 and the frame 3 so that the passenger car 19 is not crushed as shown in FIG.

  As described above, according to the present embodiment, even if the passenger car 19 goes under the track beyond the mounting position of the front underrun protector 1 due to an impact force that exceeds an assumption, the mounting bracket 7 is used by using the collision energy at the time of collision. Rotates, the front side of the frame 3 is lifted upward, and the stopper 25 protrudes outward quickly by the spring force of the leaf spring 37 and comes into contact with the lower portion of the side rail 5 to reliably prevent the frame 3 from falling. Therefore, the living space 45 is secured between the ground 43 and the frame 3 so that the passenger car 19 is not crushed by the truck. As a result, the survival rate of the driver of the passenger car 19 is increased and the driver's vehicle 19 Prompt rescue is possible.

  In the above embodiment, the stopper 25 protruding outward by the spring force of the leaf spring 37 is used to prevent the dropped frame 3 from falling, but the structure of the stopper is not limited to the above embodiment. .

DESCRIPTION OF SYMBOLS 1 Front underrun protector 3 Frame 5 Side rail 7 Mounting bracket 11 Bolt 12 Side rail side 13 Projection piece 15 Long hole 17 Pin 19 Passenger car 23 Recess 25 Stopper 27 Shaft 33, 35 Mounting flange 37 Plate spring 41 Upper end 43 of the stopper 45 living space above the ground

Claims (2)

In the mounting structure of the front underrun protector for mounting the front underrun protector below the front bumper through a pair of left and right mounting brackets fixed to the truck frame with bolts or rivets.
A stopper is formed on the mounting bracket, a long hole is provided on the rear side of the mounting bracket in the front-rear direction of the frame,
Protruding a pin for inserting the elongated hole into the frame,
A mounting bracket in which the bolt or rivet is cut when the impact force exceeding the reference acts on the front underrun protector during a frontal collision of the vehicle, and the movement is controlled by the pin by moving backward by the length of the long hole. However, by rotating the pin around the center of rotation with the collision energy at the time of collision, the front side of the frame moves upward by the reaction force,
A mounting structure for a front underrun protector, wherein the stopper provided on the mounting bracket contacts the lower part of the frame moved upward to prevent the frame from dropping. The stopper is housed on the side surface of the mounting bracket so as to face the frame, and is biased outward via an elastic member, and protrudes to the side by the elastic force of the elastic member as the mounting bracket rotates. 2. The structure for mounting a front underrun protector according to claim 1, wherein the front underrun protector is in contact with a lower portion of the frame.

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