JP2018154210A - Underrun protector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the reinforcing effect of a protector main body by a reinforcing member. A FUP 30 includes a first stiffener 60 as a reinforcing member. The first stiffener 60 is a protector main body that is bent from the upper end edge and the lower end edge of the first vertical surface portion 61 and the first vertical surface portion 61 that is fixed in a state of being in surface contact with the inner surface of the inner vertical plate portion 43 of the protector main body 31. It integrally has a first upper surface portion 62 and a first lower surface portion 63 extending toward the outer vertical plate portion of 31. The outer edge of the first vertical surface portion 61 in the vehicle width direction has a concave shape 64 in which the central portion in the vertical direction is recessed inward in the vehicle width direction and at least a part thereof is inclined in the vertical direction. [Selection diagram] FIG. 8

Description

  The present invention relates to an underrun protector for a vehicle.

  Patent Document 1 describes a rear underrun protector disposed along a vehicle width direction at a rear portion of a vehicle body frame via a bracket that extends downward and toward the rear of the vehicle body. The rear and underrun protector is a vehicle body longitudinal direction so that a rectangular closed cross section is formed between a pair of steel plate-side protector pieces on the vehicle body proximity side and vehicle body separation side with a substantially U-shaped cross section extending along the vehicle width direction. The protector main body is fixed by fitting and facing each other, and a stiffener built in the protector main body and fixed.

  The stiffener is a connecting piece portion that becomes a plate-like web surface that is arranged without a gap along the inner surface of the vertical wall of the protector piece on the vehicle body separation side, and the vertical wall of the protector piece that faces from both ends of the connecting piece portion. It is a substantially U shape which has a pair of horizontal piece part which protrudes. The pair of horizontal pieces of the stiffener are arranged so as to extend horizontally apart from each other vertically, and the ends of the pair of horizontal pieces are welded to the inner surface of the vertical wall of the protector piece on the vehicle body approaching side to fix the stiffener. Is done. Stiffeners are attached as reinforcements at the points where the greatest bending moment is applied during a collision. Further, a state in which the upper and lower horizontal pieces of the stiffener are respectively separated from the upper and lower inner surfaces of the protector main body is illustrated.

JP 2012-171390 A

  Since the stiffener (reinforcing member) of Patent Document 1 is a simple U-shape, the boundary between the reinforcing region provided with the stiffener and the non-reinforcing region where the stiffener is not provided in the protector body is along the vertical direction and the front-rear direction. It becomes a straight line. For this reason, when a load in the front-rear direction acts on the non-reinforcing region, the stress concentration at the boundary between the reinforced region and the reinforced region becomes excessive, and the rear underrun protector ( The underrun protector is easily broken, and there is a possibility that the shock absorption due to the deformation of the underrun protector may not be performed efficiently. In addition, the boundary between the reinforced region and the non-reinforced region is a straight line along the vertical direction and the front-rear direction, and the left and right sides of the upper and lower horizontal piece portions do not extend and extend to both sides of the connecting piece portion in the vehicle width direction. The stiffener may not function effectively with respect to torsion of the underrun protector. Furthermore, since the upper and lower horizontal strips of the stiffener are separated from the upper and lower inner surfaces of the protector body, the stiffener may not function effectively with respect to bending in the vertical direction.

  Then, an object of this invention is to raise the reinforcement effect of the protector main body by a reinforcement member. More specifically, the first purpose is to alleviate stress concentration when a longitudinal load acts on the non-reinforcing region of the protector body, and the second purpose is to provide effective reinforcement against torsion. The third purpose is to provide effective reinforcement against vertical bending.

  In order to achieve the above object, the underrun protector of the present invention includes a protector body and a reinforcing member. The protector main body has an inner vertical plate portion and an outer vertical plate portion that stand up apart in the front-rear direction, and a protector upper plate portion and a protector lower plate portion that are vertically separated, and the inner vertical plate portion and the outer vertical plate portion. The protector upper plate portion and the protector lower plate portion define a protector inner space extending in the vehicle width direction. The underrun protector is disposed below the front or rear end of the vehicle body and is fixedly supported on the vehicle body side. The reinforcing member is disposed in the protector inner space of the protector body and reinforces the protector body.

  The underrun protector according to the first aspect of the present invention includes a first stiffener as a reinforcing member. The first stiffener is fixed in a state of being in surface contact with the inner surface of the inner vertical plate portion, and the first stiffener is bent from the upper and lower edges of the first vertical surface portion and extends toward the outer vertical plate portion. An upper surface portion and a first lower surface portion are integrally provided. At least the outer edge in the vehicle width direction of the first vertical surface portion has a concave shape in which a central portion in the vertical direction is recessed inward in the vehicle width direction and at least a part thereof is inclined with respect to the vertical direction.

  In the above configuration, at least the outer edge of the first vertical surface portion of the first stiffener has a concave shape in which the central portion in the vertical direction is recessed inward in the vehicle width direction and at least a part is inclined with respect to the vertical direction. Therefore, the boundary between the reinforcing region in which the first stiffener is provided in the first vertical surface portion and the non-reinforcing region outside in the vehicle width direction in which the first stiffener is not provided is not linear in the vertical direction, The center portion is recessed inward in the vehicle width direction, and at least a part thereof has a recessed shape inclined with respect to the vertical direction. For this reason, the stress concentration at the boundary between the reinforced region and the reinforced region when a load in the front-rear direction is applied to the non-reinforced region can be alleviated, and the underrun protector is located near the boundary between the reinforced region and the reinforced region. It becomes difficult to break, and the shock absorption due to the deformation of the underrun protector can be efficiently performed.

  The second aspect of the present invention is the underrun protector according to the first aspect, wherein the inner vertical plate portion of the protector body has a supported region that is fixedly supported on the vehicle body side. A protector support plate supported on the vehicle body is in surface contact with the outer surface of the supported region. The protector support plate is configured such that the first region of the first stiffener is in surface contact with the inner surface of the region to be supported, and the first region and the first region are supported by the bolts that penetrate the protector support plate, the region to be supported, and the first member. Fastened and fixed to the vertical surface.

  In the above configuration, the supported region where stress tends to concentrate when a load in the front-rear direction acts on the outer side in the vehicle width direction of the supported region is reliably reinforced by the first stiffener, and the boundary between the reinforced region and the reinforced region The stress concentration in can be relaxed.

  Moreover, since the substantial plate | board thickness of a to-be-supported area | region increases with the 1st vertical surface part of a 1st stiffener, the attachment rigidity of a protector support plate can be improved.

  A third aspect of the present invention is the underrun protector according to the second aspect, wherein the underrun protector is a front underrun protector disposed below the front end portion of the vehicle body. The protector body bends obliquely rearward at a bent portion near the outside in the vehicle width direction of the supported region. The end of the first vertical surface portion of the first stiffener on the outer side in the vehicle width direction is bent along the bent shape of the inner vertical plate portion in the bent portion, and fixed in a state of being in surface contact with the inner surface of the inner vertical plate portion of the bent portion. Is done.

  In the above configuration, the end portion on the outer side in the vehicle width direction of the first vertical surface portion of the first stiffener is bent along the bent shape of the inner vertical plate portion in the bent portion, and is in surface contact with the inner surface of the inner vertical plate portion of the bent portion. Therefore, the inner vertical plate portion of the bent portion where stress tends to concentrate when a load in the front-rear direction is applied to the outer side of the bent portion in the vehicle width direction is surely secured by the first vertical surface portion of the first stiffener. It can reinforce and can suppress the break of the underrun protector at the bent portion.

  The underrun protector of the 4th aspect of this invention is equipped with a 2nd stiffener as a reinforcement member. The second stiffener is bent from the second vertical surface portion standing along the vehicle width direction in the state of being close to or in contact with the inner surface of the outer vertical plate portion, and the upper edge and the lower end edge of the second vertical surface portion. A second upper surface portion and a second lower surface portion that extend toward the surface are integrally provided. Each of the second upper surface portion and the second lower surface portion includes a central surface portion that bends from an upper edge and a lower edge of the second vertical surface portion, and left and right tensions that extend from the central surface portion to both sides in the vehicle width direction of the second vertical surface portion. It has an exit surface part integrally. The end edge of the projecting surface portion on the inner vertical plate portion side is joined to the inner surface of the inner vertical plate portion.

  In the above configuration, each of the second upper surface portion and the second lower surface portion of the second stiffener has left and right protruding surface portions extending from the central surface portion to the left and right of the second vertical surface portion, and the inner vertical plate of the protruding surface portion. Since the end edge on the part side is joined to the inner surface of the inner vertical plate portion, a suitable reaction force against the twist of the underrun protector is generated by the overhanging surface portion. Therefore, the second stiffener can function effectively with respect to the twist of the under-run protector, and excessive twist of the under-run protector can be suppressed.

  A fifth aspect of the present invention is the underrun protector according to the fourth aspect, wherein the inner vertical plate portion of the protector body has a supported region that is fixedly supported on the vehicle body side. The under-run protector is a front under-run protector disposed below the front end of the vehicle body, and the protector body bends obliquely rearward at a bent portion near the outside in the vehicle width direction of the supported region. The second stiffener is disposed in front of the supported region. On the outer side in the vehicle width direction of the second stiffener, an inclined end portion that is bent along the bent shape of the bent portion and extends outward in the vehicle width direction from the bent portion is integrally formed. The edge of the inclined end portion on the inner vertical plate portion side is joined to the inner surface of the inner vertical plate portion on the outer side in the vehicle width direction of the bent portion.

  In the above configuration, the second stiffener is integrally formed on the outer side in the vehicle width direction along the bent shape of the bent portion, and is integrally formed with an inclined end extending outward in the vehicle width direction from the bent portion. Since the edge on the plate part side is joined to the inner surface of the inner vertical plate part on the outer side in the vehicle width direction of the bent part, a bent part where stress is likely to be concentrated when a load acts on the outer side in the vehicle width direction of the bent part. The second stiffener can be reliably reinforced to prevent the under-run protector from being broken or crushed at the bent portion.

  The underrun protector according to the sixth aspect of the present invention includes a third stiffener as a reinforcing member. The third stiffener is raised from the third vertical surface portion fixed in a state of surface contact with the inner surface of the inner vertical plate portion, and bent from both ends of the third vertical surface portion in the vehicle width direction and extending toward the outer vertical plate portion. The left and right standing surface portions are integrally formed. The upper end edge and the lower end edge of the standing surface portion are close to or in contact with the lower surface of the protector upper plate portion and the upper surface of the protector lower plate portion.

  In the above configuration, since the upper edge and the lower edge of the right and left standing surface portions of the third stiffener are close to or in contact with the lower surface of the protector upper plate portion and the upper surface of the protector lower plate portion, a bending load in the vertical direction is applied to the underrun protector. When acting and trying to move relative to the direction in which the protector upper plate part and the protector lower plate part approach each other, the left and right standing surface parts are stretched to restrict the relative movement of the protector upper plate part and the protector lower plate part. Therefore, the third stiffener can function effectively with respect to the vertical bending of the under-run protector, and the vertical break of the under-run protector can be suppressed.

  A seventh aspect of the present invention is the underrun protector according to the sixth aspect, wherein the inner vertical plate portion of the protector body has a step support region that supports the step. A step connection plate fixed to the step is in surface contact with the outer surface of the step support region. The step connection plate is configured such that the third vertical surface portion of the third stiffener is in surface contact with the inner surface of the step support region, and the step support region and the third vertical portion are formed by bolts that penetrate the step connection plate, the step support region, and the third vertical surface portion. Fastened and fixed to the vertical surface.

  In the above configuration, the step support region where the vertical load from the step is applied is reliably reinforced by the third stiffener, and the vertical folding of the underrun protector due to the load from the step can be accurately suppressed. it can.

  Further, since the substantial plate thickness of the step support region is increased by the third vertical surface portion of the third stiffener, the attachment rigidity of the step connection plate can be increased.

  ADVANTAGE OF THE INVENTION According to this invention, the reinforcement effect of the protector main body by a reinforcement member can be heightened.

It is a figure which shows the front underrun protector which concerns on one Embodiment of this invention, (a) is the disassembled perspective view which looked at the state which isolate | separated the protector outer from the protector inner from the front, (b) is a protector inner to a protector outer. It is the external appearance perspective view which looked at the assembled state from back. It is a side view which shows the attachment state of the front under-run protector of FIG. It is a side view of the protector stay of FIG. It is the external appearance perspective view which looked at the state which fixed the step connection plate to the front under-run protector of FIG. 1 from back. It is an external appearance perspective view of a 1st stiffener. It is an external appearance perspective view of a 1st stiffener and a 2nd stiffener. FIG. 7 is a plan view of FIG. 6 viewed from above. It is the front view which looked at FIG. 6 from the front. It is IX-IX arrow sectional drawing of FIG. It is an external appearance perspective view of a 3rd stiffener. It is the top view which looked at Drawing 10 from the upper part. It is the side view which looked at FIG. 10 from the vehicle width direction outer side.

  Hereinafter, a front underrun protector (FUP) 30 according to an embodiment of the present invention will be described with reference to the drawings. In the figure, FR indicates the front of the vehicle, UP in the figure indicates the upper side of the vehicle, and IN in the figure indicates the inner side in the vehicle width direction. Moreover, the left-right direction in the following description is the left-right direction in the state which faced the vehicle front.

  The vehicle according to the present embodiment is a cab-over type vehicle in which the cab is generally positioned in front of the engine (not shown). As shown in FIG. 2, an FUP 30 is provided at the lower front end of the vehicle to prevent the opponent vehicle from entering the vehicle below when the vehicle collides with an opponent vehicle such as a passenger car having a low vehicle height. The FUP 30 is fixed to the vehicle body frame 1 of the vehicle and extends in the vehicle width direction.

  In the vicinity of the front end portion of the body frame 1, a suspension bracket 2, a reinforcing plate 3, a leaf suspension 4, an FUP support bracket 5, an under member 6 and the like are provided on the body frame 1 side, and a protector stay 7 is disposed on the FUP 30 side. Etc. are provided. The protector stay 7 fixed to the FUP 30 is fastened to the FUP support bracket 5 fixed to the vehicle body frame 1. The protector stays 7 are provided symmetrically on the left and right sides of the vehicle, and the left and right protector stays 7 and the FUP support bracket 5 support the left and right sides of the FUP 30. Since the left and right sides of the FUP 30 and the front end portion of the vehicle body frame 1 are configured in substantially the same manner, the left side will be mainly described below, and the description on the right side will be omitted as appropriate.

  The vehicle body frame 1 includes a pair of left and right side members 11, a cross member 12, and the like. The side members 11 extend in the front-rear direction on both sides in the vehicle width direction, and the front end portions of the left and right side members 11 are connected by the cross members 12. The suspension bracket 2 extends in the front-rear direction below the front side of the side member 11 and is fastened and fixed to the lower surface of the side member 11. The reinforcing plate 3 is fastened and fixed to the side surface of the side member 11 on the outer side in the vehicle width direction so as to stand substantially vertically on the outer side of the side member 11 and the suspension bracket 2 in the vehicle width direction. The leaf suspension 4 has a configuration in which a plurality of long plates having different lengths are stacked one above the other, and is arranged below the side member 11 so as to extend in the front-rear direction with a space between the side member 11. Is done. The front end portion of the leaf suspension 4 is fastened and fixed to the suspension bracket 2 and supported. The FUP support bracket 5 is disposed below the suspension bracket 2 and fastened and fixed to the front side of the suspension bracket 2. The FUP support bracket 5 is provided with a plate-like stay mounting surface portion 13 that is substantially orthogonal to the front-rear direction. The under member 6 extends in the vehicle width direction below the left and right FUP support brackets 5 and is fastened and fixed to the FUP support bracket 5 to connect the left and right FUP support brackets 5.

  As shown in FIGS. 2 and 3, the protector stay 7 is fastened and fixed to the FUP 30 via the stay front plate (protector support plate) 14 that stands substantially orthogonal to the front-rear direction behind the FUP 30 and the stay front plate 14. And a rectangular tubular stay body 15 extending rearward toward the FUP support bracket 5 and a stay rear plate 16 fixed to the rear end portion of the stay body 15 and fastened and fixed to the FUP support bracket 5. The post-stay plate 16 is overlapped with the stay mounting surface portion 13 of the FUP support bracket 5 from the front, and the bolt insertion hole 25 of the stay mounting surface portion 13 and the post-stay plate 16 (only the bolt insertion hole 25 of the post-stay plate 16 is illustrated. The nut 17 is screwed and fastened to the bolt 17 penetrating through (illustrated in FIG. 3). The front plate 14 is formed with a plurality of bolt insertion holes (two bolt insertion holes 19 arranged on the left and right sides and four bolt insertion holes 20 arranged on the lower left and right sides of the bolt insertion holes 19 on the left and right sides). The stay front plate 14 includes bolts 21 and 22 (shown in FIG. 9) that pass through the bolt insertion holes 19 and 20 and nuts 23 and 24 that screw into the bolts 21 and 22 from the rear (shown in FIG. 9). And fastened to the rear side of the FUP 30.

  As shown in FIGS. 1 and 9, the FUP 30 is schematically configured from a protector main body 31 and a plurality of reinforcing members (a left and right first stiffener 60, a left and right second stiffener 70, and a left and right third stiffener 80). The In the following, each part of the FUP 30 will be described with reference to the posture attached to the vehicle body.

  The protector main body 31 has a protector inner 32 extending in the vehicle width direction, and extends in the vehicle width direction on the front side of the protector inner 32. The protector main body 31 is joined to the protector inner 32 and closed between the protector inner 32 (protector extending in the vehicle width direction). A protector outer 33 that forms an inner space 34. The protector inner 32 is a rectangular plate-like inner connecting plate portion 35 standing along the vehicle width direction, and a rectangular plate shape that bends forward from the upper end edge and the lower end edge of the inner connecting plate portion 35 and extends opposite to each other. The inner upper plate portion 36 and the inner lower plate portion 37 are integrally formed with a U-shaped cross section. The protector outer 33 includes a rectangular plate-like outer connecting plate 38 that stands in the vehicle width direction in front of the inner connecting plate 35 and faces the inner connecting plate 35, an upper end edge of the outer connecting plate 38, This is a U-shaped cross section in which a rectangular plate-shaped outer upper plate portion 39 and an outer lower plate portion 40 that are bent backward from the lower end edge and extend opposite to each other are integrally formed. The opening width of the protector outer 33 (the distance between the inner surface (lower surface) of the outer upper plate portion 39 and the inner surface (upper surface) of the outer lower plate portion 40) is the vertical width of the protector inner 32 (the outer surface (upper surface of the inner upper plate portion 36). ) And the outer surface (lower surface) of the inner lower plate portion 37), or the front end portions of the inner upper plate portion 36 and the inner lower plate portion 37 are formed in the rear opening of the protector outer 33. The rear end edge of the outer upper plate portion 39 is linearly welded to the outer surface of the inner upper plate portion 36 while being fitted from behind, and the rear end edge of the outer lower plate portion 40 is connected to the outer surface of the inner lower plate portion 37. The protector main body 31 is formed by welding linearly. The inner upper plate portion 36 and the outer upper plate portion 39 constitute an upper plate portion (protector upper plate portion) 41 of the protector main body 31, and the inner lower plate portion 37 and the outer lower plate portion 40 are formed of the protector main body 31. The lower plate portion (protector lower plate portion) 42 is configured, the inner connecting plate portion 35 is configured as a vertical plate portion (inner vertical plate portion) 43 on the rear side of the protector body 31, and the outer connecting plate portion 38 is formed of the protector. A vertical plate portion (outer vertical plate portion) 44 on the front side of the main body 31 is configured.

  A supported region 50 that is fixedly supported on the vehicle body side is set at predetermined positions on the left and right sides of the inner vertical plate portion 43. The inner upper plate portion 36 above the supported region 50 has left and right upper brackets 45. Is fixed by welding or the like. The front stay plate 14 supported on the vehicle body is in surface contact with the outer surface (rear surface) of the supported region 50 and the rear surface of the upper bracket 45 from the rear. The protector main body 31 bends obliquely rearward at a bent portion 51 near the outside in the vehicle width direction of the supported region 50. As shown in FIG. 4, a step support region 52 that supports the step 53 is set in the inner vertical plate portion 43 on the outer side in the vehicle width direction of the bent portion 51, and a step is provided on the outer surface (rear surface) of the step support region 52. A flat step connecting plate 55 fixed to a circular step stay 54 extending from 53 comes into surface contact. Caps 46 are attached to the left and right ends of the protector body 31 in the vehicle width direction. The cap 46 closes the left and right open ends 47 (shown in FIGS. 10 and 12) of the protector body 31.

  The first stiffener 60, the second stiffener 70, and the third stiffener 80 are formed by bending a flat metal plate punched into a predetermined shape, respectively, and are disposed at predetermined positions in the closed space 34, respectively. The main body 31 is reinforced.

  As shown in FIGS. 5 to 9, the first stiffener 60 is fixed to the inner vertical plate portion 43 in surface contact with the inner surface (front surface) of the supported region 50 of the inner vertical plate portion 43. 61 and a first upper surface portion 62 and a first lower surface portion 63 which are bent from the upper edge and the lower edge of the first vertical surface portion 61 and extend toward the outer vertical plate portion 44 are integrally provided.

  An end of the first vertical surface portion 61 of the first stiffener 60 on the outer side in the vehicle width direction is bent along the bent shape of the inner vertical plate portion 43 in the bent portion 51, and the first vertical surface portion 61 is the first vertical surface portion 61. The side edges of the left and right sides are fixed to the inner vertical plate portion 43 by being welded linearly to the inner surface of the inner vertical plate portion 43. As a result, the end of the first vertical surface portion 61 on the outer side in the vehicle width direction is fixed in a state of being in surface contact with the inner surface of the inner vertical plate portion 43 of the bent portion 51.

  The edge of the first vertical surface portion 61 on the outer side in the vehicle width direction has concave shapes 64 and 65 in which the central portion in the vertical direction is recessed inward in the vehicle width direction and at least a part is inclined with respect to the vertical direction. The concave shapes 64 and 65 of the present embodiment are set in a substantially trapezoidal shape in which the central portion extends linearly in the vertical direction and the vertical top and bottom of the central portion are inclined linearly. The concave shape may be another shape (for example, a curved concave shape). Moreover, about the edge inside a vehicle width direction, it is good also as a linear form extended up and down without making concave shape.

  The stay front plate 14 is in a state where the first vertical surface portion 61 of the first stiffener 60 is in surface contact with the inner surface of the supported region 50 of the inner vertical plate portion 43, and the front plate 14 and the supported region 50 and the first vertical surface portion. Fastened to the supported region 50 and the first vertical surface portion 61 by bolts 21 penetrating through 61. Specifically, four bolt insertion holes 20 communicating with the four bolt insertion holes 20 on the lower side of the stay front plate 14 are also formed in the supported region 50 and the first vertical surface portion 61, respectively. The front plate 14 is fastened by inserting the bolt 22 through the bolt insertion hole 20 from the vertical surface portion 61 side to the rear, and screwing and tightening the bolt 22 and the nut 24 protruding rearward from the front plate 14. Fixed. The head of the bolt 22 is fixed to the first vertical surface portion 61, and the operator can perform a fastening operation by tightening the nut 24 from the rear side of the stay front plate 14. In addition, two bolt insertion holes 19 communicating with the two bolt insertion holes 19 on the upper side of the stay front plate 14 are also formed in the upper bracket 45, and the bolt insertion holes 19 are directed rearward from the upper bracket 45 side. The stay front plate 14 is fastened and fixed to the upper bracket 45 by inserting the bolt 21 and screwing the nut 23 onto the bolt 21 protruding rearward from the stay front plate 14.

  As shown in FIGS. 6 to 9, the second stiffener 70 includes a second vertical surface portion 71 that rises along the vehicle width direction in a state of being close to or in contact with the inner surface of the outer vertical plate portion 44, and the second vertical surface portion 71. 2nd upper surface part 72 and 2nd lower surface part 73 which are bent from the upper end edge and lower end edge of this, and are extended toward the inner vertical board part 43 are integrated. Each of the second upper surface portion 72 and the second lower surface portion 73 includes a central surface portion 74 that bends from an upper end edge and a lower end edge of the second vertical surface portion 71, and a central surface portion 74 that extends to both sides of the second vertical surface portion 71 in the vehicle width direction. Left and right projecting surface portions 75 and 76 that project and extend are integrally provided. End edges of the projecting surface portions 75 and 76 on the inner vertical plate portion 43 side are welded and joined to the inner surface of the inner vertical plate portion 43 in a linear manner.

  The second stiffener 70 is disposed in front of the supported region 50 so as to straddle the first vertical surface portion 61 of the first stiffener 60 in the vehicle width direction. A recess corresponding to the thickness of the first vertical surface portion 61 of the first stiffener 60 is formed at the edge of the central surface portion 74 on the inner vertical plate portion 43 side, and the end of the upper and lower central surface portions 74 on the inner vertical plate portion 43 side is formed. The central portion of the edge is linearly welded and joined to the front surface of the first vertical surface portion 61, and both side portions are linearly welded and joined to the inner surface of the inner vertical plate portion 43. The upper and lower central surface portions 74 are recessed downward and upward so as not to interfere with the head of the bolt 22 of the first stiffener 60.

  An inclined end 77 is integrally formed on the outer side of the second stiffener 70 in the vehicle width direction. The inclined end portion 77 bends along the bent shape of the bent portion 51 and extends outward in the vehicle width direction from the bent portion 51. The edge of the inclined end portion 77 on the inner vertical plate portion 43 side (the edge of the central surface portion 74 on the outer side in the vehicle width direction than the first vertical surface portion 61 and the edge of the protruding surface portion 76 on the outer side in the vehicle width direction) are bent. It is welded linearly to the inner surface of the inner vertical plate portion 43 outside the portion 51 in the vehicle width direction.

  As shown in FIGS. 10 to 12, the third stiffener 80 includes a third vertical surface portion 81 that is fixed in surface contact with the inner surface (front surface) of the step support region 52 of the inner vertical plate portion 43, and a third vertical surface portion 81. The left and right standing surface portions 82 and 83 are integrally formed by bending from both end edges in the vehicle width direction of the surface portion 81 and extending toward the outer vertical plate portion 44. On the upper and lower edges of the standing surface portions 82 and 83, there are steps on the lower surface of the protector upper plate portion 41 and the upper surface of the protector lower plate portion 42 (steps corresponding to the plate thicknesses of the inner upper plate portion 36 and the inner lower plate portion 37. The upper and lower edges of the standing surface portions 82 and 83 are close to or in contact with the lower surface of the protector upper plate portion 41 and the upper surface of the protector lower plate portion 42. The peripheral edge of the standing surface portion 82 on the outer side in the vehicle width direction is linearly welded and joined to the inner surface of the protector body 31 (the protector inner 32 and the protector outer 33), and the peripheral edge of the standing surface portion 83 on the inner side in the vehicle width direction is the protector inner portion. It is welded and joined to the inner surface of 32 in the form of a line. Welding of the upright surface portion 82 and the inner surface of the protector outer 33 can be performed from the opening end 47 of the protector body 31 after the protector outer 33 is joined to the protector inner 32.

  The step connection plate 55 is a bolt that penetrates the step connection plate 55, the step support region 52, and the third vertical surface portion 81 in a state where the third vertical surface portion 81 of the third stiffener 80 is in surface contact with the inner surface of the step support region 52. 84 is fastened and fixed to the step support region 52 and the third vertical surface portion 81 by 84. Specifically, four bolt insertion holes 86 communicating with four bolt insertion holes (not shown) of the step connecting plate 55 are formed in the step support region 52 and the third vertical surface portion 81, respectively. The step connecting plate 55 is fastened by inserting the bolt 84 through the bolt insertion hole 86 from the connecting plate 55 side forward and screwing the bolt 84 protruding forward from the step connecting plate 55 and the nut 85 into place. Fixed. The nut 85 is fixed to the third vertical surface portion 81, and the operator can perform a fastening operation by fastening the bolt 84 from the rear side of the step connecting plate 55.

  According to the present embodiment, the edge of the first vertical surface portion 61 of the first stiffener 60 on the outer side in the vehicle width direction is recessed at the center in the vertical direction inward in the vehicle width direction and at least partly inclined with respect to the vertical direction. Therefore, the boundary between the reinforcing region in which the first stiffener 60 is provided in the first vertical surface portion 61 and the non-reinforcing region on the outer side in the vehicle width direction in which the first stiffener 60 is not provided is also in the vertical direction. The center portion is recessed inward in the vehicle width direction, and at least a portion thereof is inclined with respect to the vertical direction. For this reason, stress concentration at the boundary between the reinforced region and the reinforced region when a load in the front-rear direction acts on the non-reinforced region can be alleviated, and the FUP 30 is unlikely to break near the boundary between the reinforced region and the reinforced region. Thus, shock absorption due to deformation of the FUP 30 can be performed efficiently.

  The supported region 50 where stress tends to concentrate when a load in the front-rear direction is applied to the outside of the supported region 50 in the vehicle width direction is reliably reinforced by the first stiffener 60, and at the boundary between the reinforced region and the reinforced region. Stress concentration can be relaxed.

  Since the substantial plate thickness of the supported region 50 is increased by the first vertical surface portion 61 of the first stiffener 60, the mounting rigidity of the pre-stay plate 14 can be increased.

  An end of the first vertical surface portion 61 of the first stiffener 60 on the outer side in the vehicle width direction is bent along the bent shape of the inner vertical plate portion 43 in the bent portion 51, and is formed on the inner surface of the inner vertical plate portion 43 of the bent portion 51. The inner vertical plate portion 43 of the bent portion 51 where stress tends to concentrate when a load in the front-rear direction acts on the vehicle width direction outer side of the bent portion 51 is fixed to the first stiffener 60 in the first stiffener 60. Reinforcement by the one vertical surface portion 61 can be ensured, and the bending of the FUP 30 at the bent portion 51 can be suppressed.

  Each of the second upper surface portion 72 and the second lower surface portion 73 of the second stiffener 70 has left and right projecting surface portions 75, 76 that project from the central surface portion 74 to the left and right of the second vertical surface portion 71. Since the end edges of the inner vertical plate portion 43 of 75 and 76 are joined to the inner surface of the inner vertical plate portion 43, a suitable reaction force against the twist of the FUP 30 is generated by the overhanging surface portions 75 and 76. . Therefore, the second stiffener 70 can function effectively with respect to the twist of the FUP 30, and the excessive twist of the FUP 30 can be suppressed.

  On the outer side in the vehicle width direction of the second stiffener 70, an inclined end portion 77 that is bent along the bent shape of the bent portion 51 and extends outward in the vehicle width direction from the bent portion 51 is integrally formed. Since the edge on the vertical plate portion 43 side is joined to the inner surface of the inner vertical plate portion 43 on the outer side in the vehicle width direction of the bent portion 51, stress is concentrated when a load acts on the outer side in the vehicle width direction of the bent portion 51. The bent portion 51 that is easily deformed can be reliably reinforced by the second stiffener 70 to prevent the FUP 30 from being folded or crushed at the bent portion 51.

  Since the upper edge and the lower edge of the left and right standing surface portions 82, 83 of the third stiffener 80 are close to or in contact with the lower surface of the protector upper plate portion 41 and the upper surface of the protector lower plate portion 42, a bending load in the vertical direction is applied to the FUP 30. When the protector upper plate part 41 and the protector lower plate part 42 try to move relative to each other, the left and right standing surface parts 82 and 83 are stretched and the protector upper plate part 41 and the protector lower plate part 42 are relative to each other. Restrict movement. Therefore, the third stiffener 80 can function effectively with respect to the vertical bending of the FUP 30 and the vertical folding of the FUP 30 can be suppressed.

  The step support region 52 to which the vertical load from step 53 acts can be reliably reinforced by the third stiffener 80, and the vertical folding of the FUP 30 due to the load from step 53 can be accurately suppressed.

  In addition, since the substantial plate thickness of the step support region 52 is increased by the third vertical surface portion 81 of the third stiffener 80, the attachment rigidity of the step connection plate 55 can be increased.

  As mentioned above, although the embodiment to which the invention made by the present inventor is applied has been described, the present invention is not limited by the discussion and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it is needless to say that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

  For example, in the above embodiment, the FUP 30 disposed below the front end of the vehicle has been described as the underrun protector. However, the underrun protector is a rear underrun protector (RUP) disposed below the rear end of the vehicle. It may be.

  Further, the reinforcing member provided in the underrun protector may be a part of the first stiffener 60, the second stiffener 70, and the third stiffener 80, and in addition to these, other reinforcing members may be provided.

  The underrun protector of the present invention can be used for various vehicles.

1: body frame 7: protector stay 13: stay mounting surface portion 14: stay front plate (protector support plate)
15: Stay main body 16: Post-stay plate 16
19, 20, 25, 86: Bolt insertion holes 17, 21, 22, 84: Bolts 18, 23, 24, 85: Nut 30: Front underrun protector (underrun protector)
31: Protector body 32: Protector inner 33: Protector outer 34: Closed space (inner space)
35: Inner connecting plate portion 36: Inner upper plate portion 37: Inner lower plate portion 38: Outer connecting plate portion 39: Outer upper plate portion 40: Outer lower plate portion 41: Protector upper plate portion 42: Protector lower plate portion 43: Inner vertical plate portion 44: outer vertical plate portion 47: open end 50: supported region 51: bent portion 52: step support region 53: step 54: step stay 55: step connecting plate 60: first stiffener (reinforcing member)
61: 1st vertical surface part 62: 1st upper surface part 63: 1st lower surface part 64, 65: Recessed shape 70: 2nd stiffener (reinforcing member)
71: 2nd vertical surface part 72: 2nd upper surface part 73: 2nd lower surface part 74: Center surface part 75, 76: Overhang | projection surface part 80: 3rd stiffener (reinforcing member)
81: Third vertical surface portion 82, 83: Standing surface portion

Claims (7)

An inner vertical plate portion and an outer vertical plate portion that stand apart in the front-rear direction; and a protector upper plate portion and a protector lower plate portion that are vertically separated; and the inner vertical plate portion, the outer vertical plate portion, and the A protector main body that is partitioned by a protector upper plate portion and the protector lower plate portion to extend in the vehicle width direction, is disposed below the front or rear end of the vehicle body, and is fixedly supported on the vehicle body side. ,
A reinforcing member disposed in the protector inner space of the protector body to reinforce the protector body,
The reinforcing member is bent from an upper edge and a lower edge of the first vertical surface portion fixed in a state of being in surface contact with the inner surface of the inner vertical plate portion, and is directed toward the outer vertical plate portion. A first stiffener integrally including a first upper surface portion and a first lower surface portion extending;
At least an edge of the first vertical surface portion on the outer side in the vehicle width direction has a concave shape in which a central portion in the vertical direction is recessed inward in the vehicle width direction and at least a part is inclined with respect to the vertical direction. Run protector. The underrun protector according to claim 1,
The inner vertical plate portion of the protector body has a supported region that is fixedly supported on the vehicle body side,
A protector support plate supported on the vehicle body is in surface contact with the outer surface of the supported region,
The protector support plate is a bolt that penetrates the protector support plate, the supported region, and the first vertical surface portion in a state where the first vertical surface portion of the first stiffener is in surface contact with the inner surface of the supported region. The underrun protector is fastened and fixed to the supported region and the first vertical surface portion. The underrun protector according to claim 2,
The underrun protector is a front underrun protector disposed below the front end of the vehicle body,
The protector body bends obliquely rearward at a bent portion near the outside in the vehicle width direction of the supported region,
An end portion of the first stiffener on the outer side in the vehicle width direction of the first vertical surface portion is bent along the bent shape of the inner vertical plate portion in the bent portion, and is formed on the inner surface of the inner vertical plate portion of the bent portion. An underrun protector that is fixed in surface contact. An inner vertical plate portion and an outer vertical plate portion that stand apart in the front-rear direction; and a protector upper plate portion and a protector lower plate portion that are vertically separated; and the inner vertical plate portion, the outer vertical plate portion, and the A protector main body, which is partitioned by a protector upper plate portion and the protector lower plate portion to extend in the vehicle width direction, is disposed below the front or rear end of the vehicle body, and is fixed to the vehicle body side,
A reinforcing member disposed in the protector inner space of the protector body to reinforce the protector body,
The reinforcing member is bent from an upper edge and a lower edge of the second vertical surface portion standing in the vehicle width direction in a state of being close to or in contact with the inner surface of the outer vertical plate portion, and the inner vertical portion. A second stiffener integrally including a second upper surface portion and a second lower surface portion extending toward the plate portion; and each of the second upper surface portion and the second lower surface portion includes an upper end edge of the second vertical surface portion and A central surface portion that bends from the lower end edge, and left and right projecting surface portions that extend from the central surface portion to both sides in the vehicle width direction of the second vertical surface portion;
The under-run protector, wherein an end edge of the projecting surface portion on the inner vertical plate portion side is joined to an inner surface of the inner vertical plate portion. The underrun protector according to claim 4,
The inner vertical plate portion of the protector body has a supported region that is fixedly supported on the vehicle body side,
The underrun protector is disposed below the front end of the vehicle body,
The protector body bends obliquely rearward at a bent portion near the outside in the vehicle width direction of the supported region,
The second stiffener is disposed in front of the supported region;
On the outer side in the vehicle width direction of the second stiffener, an inclined end portion that is bent along the bent shape of the bent portion and extends outward in the vehicle width direction from the bent portion is integrally formed,
An edge of the inclined end portion on the inner vertical plate portion side is joined to the inner surface of the inner vertical plate portion on the outer side in the vehicle width direction of the bent portion. An inner vertical plate portion and an outer vertical plate portion that stand apart in the front-rear direction; and a protector upper plate portion and a protector lower plate portion that are vertically separated; and the inner vertical plate portion, the outer vertical plate portion, and the A protector main body, which is partitioned by a protector upper plate portion and the protector lower plate portion to extend in the vehicle width direction, is disposed below the front or rear end of the vehicle body, and is fixed to the vehicle body side,
A reinforcing member disposed in the protector inner space of the protector body to reinforce the protector body,
The reinforcing member is bent from both end edges in the vehicle width direction of the third vertical surface portion and fixed to the inner vertical plate portion in surface contact with the inner vertical plate portion, toward the outer vertical plate portion. A third stiffener integrally including left and right standing surface portions extending and standing;
The under-run protector, wherein an upper end edge and a lower end edge of the rising surface portion are close to or in contact with a lower surface of the protector upper plate portion and an upper surface of the protector lower plate portion. The underrun protector according to claim 6,
The inner vertical plate portion of the protector body has a step support region for supporting a step,
A step connection plate fixed to the step is in surface contact with the outer surface of the step support region,
The step connection plate is a bolt that penetrates the step connection plate, the step support region, and the third vertical surface portion in a state where the third vertical surface portion of the third stiffener is in surface contact with the inner surface of the step support region. The underrun protector is fastened and fixed to the step support region and the third vertical surface portion by the above.

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