JP4842062B2 - Underrun protector - Google Patents

Description

  The present invention relates to an underrun protector in which a protector body positioned at a front end portion or a rear end portion of a vehicle is supported by a mounting bracket attached to a frame of the vehicle.

  In recent years, an underrun protector has been adopted as a device for preventing one vehicle from entering under the other vehicle at the time of a collision between vehicles. For example, Patent Document 1 proposes a front underrun protector provided at the front end of a vehicle.

  As shown in FIGS. 14 to 17, the underrun protector 90 includes a protector main body (hereinafter referred to as FUP main body) 91 (see FIGS. 15 and 18) extending in the vehicle width direction, and the FUP main body 91. And a bracket 93 attached to the vehicle frame 92 for support.

  The bracket 93 includes a main body mounting portion 94 formed in a plate shape along the vehicle width direction, and a frame mounting portion formed in a box-shaped closed cross-section structure at a substantially right angle with respect to the main body mounting portion 94 when viewed from above. 95.

  Further, a substantially triangular reinforcing rib 96 is provided between the main body attaching portion 94 and the frame attaching portion 95 at a lower portion of the bracket 93 (indicated by reference symbol A in FIG. 14).

  A test for measuring the load bearing performance of such an underrun protector 90 is defined by European regulations (ECE R93) and the like. Among such tests, there is a test in which a predetermined load (50% of the total weight of the vehicle, hereinafter referred to as P1 load) is applied from the front side to the underrun protector 90 at a position inside a predetermined distance (200 mm) from the outermost side of the vehicle. is there.

  As shown in FIG. 18, a moment Mo is applied to the FUP main body 91 when a P1 load is applied.

  In the underrun protector 90 having the structure shown in FIG. 14, in order to obtain the strength necessary to withstand the moment Mo, the frame mounting portion 95 of the bracket 93 has a box-shaped closed cross-sectional shape, Although parts such as a reinforcing material (rib) 96 are added, there is a problem that the force concentrates on the end portion of the reinforcing material (rib) 96 and tends to be a starting point of buckling.

  Further, when the moment Mo is applied to the FUP main body 91 due to the P1 load, the rib 96 receives a force in the in-plane direction at the portion A of the bracket 93, so that it does not twist, but the rib 96 is not provided in FIG. In B part, since it is not the structure which receives force in the in-plane direction with respect to the moment Mo, there exists a possibility that twist may generate | occur | produce in the bracket 93 at an early stage.

  Therefore, measures such as increasing the plate thickness of the bracket are required to obtain the strength that satisfies the above-mentioned European regulations.

  Further, for example, in the underrun protector 90 of FIG. 14, as described above, the frame mounting portion 95 of the bracket 93 has a box-shaped closed cross-sectional shape so as to obtain satisfactory strength.

JP 2004-243984 A

  However, increasing the thickness of the bracket increases the weight and cost.

  Further, when the frame mounting portion 93 has a box-shaped closed cross-sectional structure as in the bracket 93 of FIG. 14, an increase in weight and an increase in cost are caused.

  Accordingly, an object of the present invention is to provide an underrun protector capable of solving the above-described problems and achieving weight reduction and cost reduction while maintaining sufficient strength.

To accomplish the above object, is located at the front end or the rear end of the vehicle, the underrun comprising a protector body that extend in the vehicle width direction, and a mounting bracket that is attached to a frame of the vehicle In the protector, the mounting bracket is formed of a vertically long rectangular plate and a rectangular plate integrally extending from the lower side edge of the rectangular plate, and the rectangular plate is bent at a right angle. The stay plate has a vertically long rectangular stay plate and a mounting piece that extends from the stay plate to the outside in the vehicle width direction and supports the protector main body. The stay plate is attached to the side of the frame at the upper part of the stay plate. in mounting holes for fixing are formed, further, along the upper and lower edge of the opposite direction of the stay plate and the mounting piece, I in its stay plate and horizontal T-shaped cross-section Support plate is provided so as and composed by upper and lower ribs are provided for connecting the mounting piece and the support plate with provided so as to extend horizontally along the stay plate to the mounting piece and support plates It is.

Preferably, the upper end of the upper Symbol support plate, in which support a mounting flange which is fixed to the lower surface of the frame Ru is formed by bending a support plate.

Preferably, a rib attachment flange fixed to the support plate is formed on the rib by bending the rib .

An underrun protector comprising a protector main body positioned at the front end or rear end of the vehicle and extending in the vehicle width direction, and an attachment bracket attached to the vehicle frame, wherein the attachment bracket is a protector. It is composed of a stay plate formed by bending a vertically long rectangular plate material in the vehicle width direction so as to offset the support position of the main body outward in the vehicle width direction, and a mounting piece attached to the lower part of the stay plate. The piece includes a stay mounting portion that is bent in an L shape from a square plate material and extends back and forth along the stay plate, and a main body mounting portion that extends outward from the stay plate in the vehicle width direction and supports the protector body. In the upper part of the stay plate, a mounting hole for fixing the stay plate to the frame with bolts or rivets is formed, and further, it is opposite to the mounting piece. A support plate is provided along the upper and lower edges of the stay plate so that the stay plate has a T-shaped horizontal cross section with the stay plate, and the stay mounting portion is provided between the main body mounting portion of the mounting piece and the support plate. The upper and lower ribs are provided so as to extend horizontally along the main body mounting portion and the support plate .

  According to the present invention, it is possible to achieve an excellent effect that the underrun protector can be reduced in weight and cost while maintaining sufficient strength.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[First Embodiment]
The underrun protector of the present embodiment is used as a front underrun protector disposed at the front end of a large vehicle, for example.

  First, a schematic structure of a vehicle frame and an underrun protector will be described with reference to FIGS.

  As shown in FIG. 1, a vehicle frame includes a pair of side members (only one of which is shown in FIG. 1) 11 spaced apart in the vehicle width direction, and a plurality of cross members (not shown) that connect the side members 11. ).

  The side member 11 has a U-shaped cross section that extends in the front-rear direction and has a web 111 that extends in the vertical direction, and an upper flange 112 and a lower flange 113 that extend inward in the vehicle width direction from the upper and lower ends of the web 111, respectively.

  The underrun protector 1 includes a protector main body (hereinafter referred to as an FUP main body) 2 positioned at a front end portion of a vehicle, and a pair of mounting brackets 3 and 3 (which are respectively attached to side members 11 of the frame and support the FUP main body 2). 1 shows only one).

  The FUP body 2 is disposed below the side member 11. The FUP main body 2 is made of a hollow material or the like (for example, a steel pipe) extending in the vehicle width direction, and has a substantially straight straight portion 21 and a curved portion 22 that is curved and extends from both ends of the straight portion 21 to the rear of the vehicle. Have

  The straight portion 21 of the FUP main body 2 is provided with a pair of main body brackets 23 and 23 (only one of them is shown in FIG. 1) at a predetermined interval in the vehicle width direction. The FUP body 2 is supported by both side members 11 via the brackets 3 and 3.

  Each main body bracket 23 is formed in a U-shaped cross section, and is attached to the FUP main body 2 with rivets, bolts (or welding) or the like so as to sandwich the FUP main body 2 vertically from the rear side.

  As shown in FIGS. 2 and 3, the mounting bracket 3 includes a stay plate 4 attached to the side member 11 of the frame and extending downward from the side member 11, and provided so as to be orthogonal to the lower portion of the stay plate 4. 2 and a support plate provided so as to form a horizontal cross section T-shape (see FIG. 6) with the stay plate 4 along the upper and lower sides of the stay plate 4 on the opposite side of the mounting piece 5. 6.

  The stay plate 4 is made of a plate material extending in the vertical direction, and is attached in parallel to the outer surface of the web 111 of the side member 11.

  Specifically, mounting holes 42 (six in the illustrated example) are formed in the upper portion of the stay plate 4, and mounting holes (not shown) corresponding to the mounting holes 42 of the stay plate 4 are side members. 11 and the stay plate 4 is fixed to the outer surface of the web 111 of the side member 11 with bolts, rivets or the like.

  The mounting piece 5 of this embodiment is formed integrally with the stay plate 4.

  That is, a projecting portion 51 projecting forward at the lower portion of the stay plate 4 and a plate-shaped body attaching portion 52 extending in parallel with the body bracket 23 (see FIG. 1) from the front end of the projecting portion 51 outward in the vehicle width direction. And are formed. The protrusions 51 and the main body attachment portion 52 constitute the attachment piece 5.

  As shown in FIG. 1, the main body bracket 23 attached to the FUP main body 2 is attached to the main body attachment portion 52 of the attachment piece 5, and the FUP main body 2 is supported by the frame.

  Returning to FIG. 2, specifically, attachment holes 53 (four in the illustrated example) are formed in the body attachment portion 52, and attachment holes (not shown) corresponding to the attachment holes 53 of the body attachment portion 52 are formed. ) Are formed on the main body bracket 23, and the main body mounting portion 52 and the main body bracket 23 are fixed by bolts, rivets, or the like.

  On the lower outer surface of the stay plate 4, a plurality of (two in the illustrated example) ribs 7, 8 that form a reinforcing material are provided vertically spaced apart.

  Each of the ribs 7 and 8 is formed in a taper shape that extends back and forth along the outer surface of the stay plate 4 and has a width that becomes narrower from the front to the rear.

  The ribs 7 and 8 of the present embodiment extend from the main body mounting portion 52 of the mounting piece 5 to the back support plate 61 of the support plate 6 described later, and the front and rear end surfaces of the ribs 7 and 8 are the main body mounting portion 52 and the back support plate. Each is fixed to 61 by welding or the like, for example.

  Furthermore, a rib mounting flange 71 extending upward is provided at the rear end (the rear support plate 61 side end) of the upper rib 7, and the rib mounting flange 71 is welded to the front surface 61 a of the rear support plate 61. Fixed. The inner surfaces of the ribs 7 and 8 are also fixed to the outer surface of the stay plate 4 by welding or the like.

  The support plate 6 includes a rear support plate 61 extending in the vertical direction along the rear end of the stay plate 4 and a support attachment formed at the upper end of the rear support plate 61 and extending rearward along the lower flange 113 of the side member 11. It has a flange 62 and has an L-shaped cross section (viewed in the vehicle width direction).

  The back support plate 61 is formed in a plate shape that extends from the lower end of the stay plate 4 to the lower surface of the lower flange 113 of the side member 11.

  The back support plate 61 is disposed substantially perpendicular to the stay plate 4. More specifically, the rear end surface of the stay plate 4 is joined to the middle portion in the width direction of the back support plate 61 by welding or the like so that the back support plate 61 and the stay plate 4 have a T-shaped horizontal section. That is, the back support plate 61 extends from the rear end of the stay plate 4 to both sides in the vehicle width direction.

  The support mounting flange 62 is coupled to the lower surface of the lower flange 113 of the side member 11. Specifically, mounting holes (not shown) are formed in the support mounting flange 62 and the lower flange 113, respectively, and the support mounting flange 62 and the lower flange 113 are fixed with bolts, rivets or the like.

  The main body bracket 23, the stay plate 4, the support plate 6, and the ribs 7 and 8 are formed, for example, by pressing a metal plate.

  Next, the operation of the underrun protector 1 according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 7, the load P1 in the load resistance test is applied to the FUP main body 2 from the front side of the vehicle.

  The load P1 is applied to a point (hereinafter referred to as a load point) separated from the stay plate 4 by a predetermined distance L in the vehicle width direction, and the FUP main body 2 is moved around the mounting position (support position) of the stay plate 4 by the load P1. Moment Mo to rotate is activated.

  The moment Mo causes a force that causes torsional deformation in the stay plate 4, but in this embodiment, a T-shaped cross section with the stay plate 4 along the upper and lower sides of the rear end of the stay plate 4 ( Since the support plate 6 is provided so as to form the structure (see FIG. 6), the force applied to the stay plate 4 is dispersed in the in-plane direction (in the illustrated example, the direction orthogonal to the vehicle width direction) by the support plate 6. The torsional deformation of the stay plate 4 (mounting bracket 3) is suppressed.

  Furthermore, in the present embodiment, the upper portion of the stay plate 4 is directly coupled to the web 111 of the side member 11, and the stay plate 4 is fixed to the lower flange 113 of the side member 11 via the support plate 6. Therefore, the upper side and the rear side of the stay plate 4 are constrained by the side member 11, which can also suppress torsional deformation.

  As described above, in the present embodiment, it is possible to obtain the same strength as the mounting bracket 93 (underrun protector 90) having a conventional structure (box-shaped closed section structure) as shown in FIG.

  Further, compared to a box-shaped closed cross-sectional structure, the T-shaped cross-sectional structure can be made of less material, and since the structure is simple, weight reduction and cost reduction can be achieved.

  Thus, in this embodiment, the support plate 6 is disposed on the back surface of the stay plate 4 of the mounting bracket 3 and the support plate 6 is welded to the stay plate 4 so that the force applied to the stay plate 4 is in the in-plane direction. By adopting the receiving structure, the same effect as that of the ribs 7 and 8 can be exhibited, and thereby the load applied to the stay plate 4 by the moment Mo generated when the P1 load is input can be dispersed.

  As a result, while maintaining the same strength as the conventional one, the weight and cost can be reduced, and the investment can be reduced.

  For example, the underrun protector 1 in FIG. 1 can be reduced in weight by about 20% while maintaining the same strength as the conventional product in FIG. 14, and the cost can be reduced by about 20% with the same investment as the conventional product in FIG. it can.

  In addition, since the rear end surfaces of the ribs 7 and 8 are brought into contact with the support plate 6 and the load applied to the ribs 7 and 8 is distributed in the in-plane direction of the stay plate 4, The force is not concentrated and buckling of the stay plate 4 can be suppressed.

  Moreover, attachment strength can be improved by attaching the attachment bracket 3 to two places, the outer surface and the lower surface of the side member 11. In particular, since the torsional deformation of the stay plate 4 is reduced, a greater torsional force is applied to the connecting portion between the mounting bracket 3 and the side member 11. In this embodiment, the support plate 6 is supported by the support plate 6. Since the mounting flange 62 is fixed to the lower surface of the side member 11, the strength against torsion can be increased.

[Second Embodiment]
Next, a second embodiment will be described based on FIG. 8 and FIG.

  This embodiment differs from the first embodiment described above in the shapes of the mounting bracket and the support plate, and is otherwise the same. Accordingly, the same elements as those in the above-described embodiment are given the same reference numerals in the drawings, and detailed description thereof is omitted.

  As shown in FIGS. 8 and 9, in the mounting bracket 31 of the present embodiment, the stay plate 43 and the mounting piece 54 are formed as separate bodies, and the stay plate 43 defines the support position of the FUP body 2 in the vehicle width. It is formed by bending in the vehicle width direction so as to be offset in the direction.

  The stay plate 43 is attached to the side member 11 and extends in the up-down direction, and an offset portion 432 that extends a predetermined length (offset length) outward from the lower end of the side member mounting portion 431 in the vehicle width direction. And an attachment attachment portion 433 that extends downward from the outer end portion of the offset portion 432 and to which the attachment piece 54 is attached.

  The offset portion 432 of the present embodiment extends downwardly from the side member attachment portion 431 to the attach attachment portion 433.

  The attachment piece 54 includes a plate-like stay attachment portion 541 that is joined by welding or the like in parallel to the attachment attachment portion 433 of the stay plate 43, and a main body attachment portion 52 that is provided substantially at right angles to the stay attachment portion 541. And has a horizontal cross-sectional L shape.

  The back support plate 631 of the support plate 63 is formed in a taper shape that increases in width from the bottom to the top along the rear end of the stay plate 43 that bends.

  Also in this embodiment, the same effect as that of the first embodiment can be obtained. Further, by bending the stay plate 43, the support position of the FUP body 2 is offset from the web 111 of the side member 11 to the outside in the vehicle width direction. Can be easily done.

  Further, by offsetting, the distance L (see FIG. 7) between the support position (fastening position) of the FUP body 2 and the load position of the P1 load can be shortened, and the moment Mo generated by the P1 load can be reduced. be able to.

  As a result, it is possible to reduce the plate thickness while ensuring sufficient strength, and to reduce the weight and cost of the underrun protector 1.

  Further, by dividing the mounting bracket 31 into the stay plate 43 and the mounting piece 54, it is possible to deal with vehicles having various ground heights. That is, by changing the vertical position of the attachment piece 54 with respect to the attachment attachment portion 433 of the stay plate 43, the attachment height of the FUP main body 2 can be easily set according to the ground height of the vehicle.

  Moreover, the bracket structure which can respond | correspond to various flame | frame assembly width can be made by offsetting the attachment bracket 31 and changing the amount of offsets.

  For example, as shown in FIGS. 10 and 11, the offset amount of the mounting bracket 32 may be set larger than that of the mounting bracket 31 of FIGS. 8 and 9.

[Third Embodiment]
Next, a third embodiment will be described based on FIG. 12 and FIG.

  This embodiment is different from the above-described second embodiment in the shapes of the stay plate, the upper rib, and the support plate, and is otherwise the same. Accordingly, the same elements as those in the above-described embodiment are given the same reference numerals in the drawings, and detailed description thereof is omitted.

  As shown in FIGS. 12 and 13, in the mounting bracket 33 of this embodiment, a stay mounting flange 451 that is fixed to the lower surface of the lower flange 113 of the side member 11 is formed at the upper end of the stay plate 45. The stay mounting flange 451 is formed with a plurality of (three in the illustrated example) mounting holes 452 (see FIG. 13) for mounting the stay plate 45 to the lower flange 113.

  That is, the frame attachment portion 431 of the stay plate 45 extends upward from the inner end portion of the offset portion 432 and bends inward along the lower flange 113.

  Further, in the present embodiment, unlike the first and second embodiments described above, the support mounting flange 62 (see FIG. 8) of the support plate 63 is omitted, and the upper end surface of the back support plate 631 is the lower flange 113. It is fixed directly to the lower surface of the steel by welding or the like.

  Further, in the present embodiment, the rib mounting flange 71 (see FIG. 8) of the upper rib 7 is omitted, and the upper rib 7 has a rear end surface directly on the front surface of the rear support plate 61 as in the lower rib 8. It is fixed to 61a by welding or the like.

  Thus, in the present embodiment, the mounting bracket 31 can be mounted on the lower surface of the frame 11 by changing the shape of the mounting bracket 31 and providing the stay mounting flange 451 at the upper end of the stay plate 45.

  In addition, this invention is not limited to the above-mentioned embodiment, Various modifications and application examples can be considered.

  For example, an underrun protector may be provided at the rear of the vehicle and used as a rear underrun protector. In that case, the arrangement relationship is reverse to that in the embodiment described above, and the protector body 2 is positioned at the rear end of the vehicle.

FIG. 1 is a perspective view of an underrun protector according to an embodiment of the present invention. FIG. 2 is a perspective view of the mounting bracket of the present embodiment, showing a state in which the mounting bracket is attached to the frame. FIG. 3 is a perspective view showing a component configuration of the mounting bracket of FIG. FIG. 4 is a side view of the mounting bracket of the present embodiment. 5 is a cross-sectional view taken along line VV in FIG. 6 is a sectional view taken along line VI-VI in FIG. 7 is a view taken in the direction of arrow VII in FIG. FIG. 8 is a perspective view of the mounting bracket of the second embodiment, showing a state in which the mounting bracket is attached to the frame. FIG. 9 is a perspective view showing a component configuration of the mounting bracket of FIG. FIG. 10 is a perspective view of a modified example of the mounting bracket of FIG. 8, showing a state in which the mounting bracket is attached to the frame. FIG. 11 is a perspective view showing a component configuration of the mounting bracket of FIG. FIG. 12 is a perspective view of the mounting bracket of the third embodiment, showing a state in which the mounting bracket is attached to the frame. FIG. 13 is a perspective view showing a component structure of the mounting bracket of FIG. FIG. 14 is a perspective view of a conventional mounting bracket. FIG. 15 is a side view of a conventional mounting bracket. 16 is a cross-sectional view taken along line XVI-XVI in FIG. 17 is a cross-sectional view taken along line XVII-XVII in FIG. 18 is a view taken in the direction of arrow XVIII in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Underrun protector 2 Protector body 3 Mounting bracket 4 Stay plate 5 Mounting piece 6 Support plate 11 Side member (frame)

Claims (4)

Is located at the front end or the rear end of the vehicle, the protector body extending in the vehicle width direction, the underrun protector and a mounting bracket that is attached to the frame of the vehicle,
The mounting bracket is formed of a vertically long rectangular plate and a rectangular plate integrally extending from a lower side edge of the rectangular plate, and a vertically long rectangular shape formed by bending the rectangular plate at a right angle. The stay plate and the mounting plate that extends from the stay plate to the outside in the vehicle width direction and supports the protector body,
At the upper part of the stay plate, a mounting hole for fixing the stay plate to the side surface of the frame with a bolt or rivet is formed,
Moreover, along the top and bottom edges of the opposite direction of the stay plate and attachment piece, the support plate is provided so that the horizontal T-shaped cross-section with its stay plate, and stay plates to the mounting piece and support plates And an upper and lower rib for connecting the mounting piece and the support plate, and an underrun protector. The upper end of the upper Symbol support plate, underrun protector according to claim 1, wherein the support attachment flange which is fixed to the lower surface of the frame Ru is formed by bending a support plate. The underrun protector according to claim 1 or 2, wherein a rib mounting flange fixed to the support plate is formed on the rib by bending the rib . In an underrun protector provided with a protector body that is positioned at the front end or rear end of the vehicle and extends in the vehicle width direction, and a mounting bracket that is attached to the frame of the vehicle,
The mounting bracket includes a stay plate formed by bending a vertically long rectangular plate member in the vehicle width direction so as to offset the support position of the protector body outward in the vehicle width direction, and a mounting piece attached to the lower portion of the stay plate. Consists of
The mounting piece bends a rectangular plate material into an L shape and extends in the front-rear direction along the stay plate, and a main body mounting portion that extends outward from the stay plate in the vehicle width direction and supports the protector body. Consists of
At the upper part of the stay plate, a mounting hole for fixing the stay plate to the frame with bolts or rivets is formed,
Further, a support plate is provided along the upper and lower edges of the stay plate in the direction opposite to the mounting piece so that the stay plate has a T-shaped horizontal cross section with the stay plate, and between the mounting portion of the mounting piece and the support plate. The underrun protector is provided so as to extend horizontally along the stay attaching portion and to be provided with upper and lower ribs for connecting the main body attaching portion and the support plate .

Images