JP5477680B2 - Body front structure - Google Patents

Description

  The present invention relates to a front structure of a vehicle body.

  Patent Document 1 describes a vehicle body structure in which a side member is divided into a sub-side member forming a front portion and a main side member forming most of the remaining portion. The sub-side member is composed of a channel material having a groove shape toward the outside in the vehicle width direction, and the main side member is composed of a channel material having a groove shape toward the inside in the vehicle width direction. The sub-side member is disposed in a state offset to the outer side in the vehicle width direction with respect to the main side member, and is fastened in the vehicle width direction by bolts and nuts in a back-to-back state sandwiching the main side member and the spacer.

Japanese Patent No. 3790445

  By the way, when a vehicle with a low vehicle height such as a passenger car (hereinafter referred to as a small vehicle) collides with a front surface of a vehicle with a high vehicle height such as a truck (hereinafter referred to as a large vehicle), the small vehicle is below the large vehicle. There is a risk of diving into the side. In order to prevent such inconvenience, it is known that in a large vehicle, a front under-run protector is disposed at the front of the vehicle and connected to the front of the vehicle body via a support member such as a bracket.

  However, when the front under-run protector is connected to the side member of Patent Document 1 via the support member, in the structure in which the support member is simply connected to the side member, the impact load generated on the front under-run protector is applied to the support member and the side member. There is a possibility that the connection part is concentrated on the connection part with the member and the connection part is damaged, and the submergence of the small vehicle cannot be suppressed.

  Further, in the vehicle body structure of Patent Document 1, since the side member is divided into a sub-side member and a main side member and is fastened with bolts and nuts, the bolts are applied when an impact load is applied to the sub-side member.・ Stress may be concentrated on the nut and the fastening part may be damaged.

  These inconveniences can be avoided by providing a reinforcing member or the like at the connecting portion between the support member and the side member and the fastening portion between the sub-side member and the main side member, but this increases the weight of the structure.

  Therefore, an object of the present invention is to provide a front structure of a vehicle body capable of improving rigidity and strength without increasing the weight of the structure.

  In order to achieve the above object, the vehicle body front structure according to the first aspect of the present invention includes a pair of side members, a cross member, a pair of brackets, and a front underrun protector.

The pair of side members are arranged along the front-rear direction on both sides in the vehicle width direction of the vehicle, and each has a front end portion that bends outward in the vehicle width direction. The cross member connects the front end portions of the pair of side members. The pair of brackets are respectively coupled to the front end portions of the pair of side members and the cross member. The front underrun protector is supported by the pair of brackets and extends in the vehicle width direction.
In a first aspect, the upper end of the base portion of the bracket is formed upper plate horizontally, the lower end of the front end portion of the side member is formed lower end surface horizontally, the lower end surface on the lower end of the cross member is formed Is done. The upper plate extends from the base portion in the vehicle width direction and contacts the lower end surface of the side member and is coupled to the first fastening portion, and extends from the base portion in the vehicle width direction and contacts the lower end surface of the cross member to be coupled. And a second fastening portion. Further, the bracket may include a third fastening portion that is coupled to the front end portion of the side member at a rear side of a coupling portion between the front under-run protector and the bracket, and the first fastening portion is located more than the coupling portion. You may couple | bond with the lower end surface of a side member ahead.

  In the above configuration, the front end portion of the side member that is bent outward in the vehicle width direction is integrally formed. For this reason, higher strength can be obtained than when the front end portion of the side member is divided.

  The bracket is coupled to the front end portion of the side member and the cross member. Thereby, when an impact load acts on the front underrun protector, the impact load is distributed and transmitted to the cross member and the side member via the bracket. For this reason, mounting strength can be secured by the rigidity of the bracket without providing a separate reinforcing member or the like.

  Further, since the front end portion of the side member is bent outward in the vehicle width direction and the space between the front end portions of the side members is widened in the vehicle width direction, the interval between the brackets coupled to the front end portion of each side member is increased. The front end portion of the side member is wider in the vehicle width direction than when the side member is linear. For this reason, the support position by the bracket of the front underrun protector is close to the outer end in the vehicle width direction of the front underrun protector, and when the external force acts on the outer end in the vehicle width direction of the front underrun protector, the above support position is set. The bending moment generated at the center can be kept small, and the strength in the front-rear direction of the outer end portion in the vehicle width direction of the front underrun protector is improved.

  In this way, the front end of the bent side member is integrally formed, and the rigidity and strength of the front of the vehicle body are improved without increasing the weight by coupling the bracket to the front end of the side member and the cross member. Can be made. In other words, it is possible to reduce the thickness and weight of members such as brackets, side members, and front under-run protectors while maintaining the rigidity and strength of the front portion of the vehicle body.

  The vehicle body front structure according to the second aspect of the present invention is the vehicle body front structure according to the first aspect, and includes a pair of cab mounts and a pair of floor underframes. The pair of cab mounts are fixed to the front end portions of the pair of side members, and support the front end portions of the cab from below. The pair of floor under frames extend in the front-rear direction at the lower end portions on both sides in the vehicle width direction of the cab, and the front end portion of the floor under frame, the cab mount, and the front end portions of the side members are arranged in a substantially straight line in the vertical direction. .

  In the above configuration, when an impact load acts on the cab or the floor under frame from the front, the impact load is transmitted from the floor under frame to the side member via the cab mount. At this time, the front end portion of the floor underframe, the cab mount, and the front end portion of the side member are arranged in a substantially straight line in the vertical direction, so that the impact load generated in the cab can be efficiently transmitted to the side member. It is possible to effectively absorb the impact energy at the time of collision and suppress the deformation of the cab.

  In addition, since the pair of floor under frames extends in the front-rear direction at the lower ends of both sides of the cab in the vehicle width direction, the strength of the lower ends of both sides of the cab in the vehicle width direction can be ensured by the rigidity of the pair of floor under frames. In addition, deformation of the cab during an offset collision or a collision with the cab side surface can be suppressed.

  The vehicle body front structure according to the third aspect of the present invention is the vehicle body front structure according to the second aspect, and a pair of floor underframes are linearly formed in the front-rear direction.

  In the above configuration, since the floor under frame is formed in a straight line, the strength in the front-rear direction of the floor under frame is improved, and the strength in the front-rear direction of the lower end portion of the cab is also improved. For this reason, when the impact load of the front-back direction arises in a cab, a deformation | transformation of the lower end part of a cab can be suppressed and the living space of a cab can be ensured.

  The vehicle body front structure according to the fourth aspect of the present invention is the vehicle body front structure according to the first to third aspects, wherein the front end portions of the pair of side members are placed on the pair of side members. It is arranged in front of the engine.

  In the above configuration, the engine can be attached to the side member using the same attachment structure as that in the case where the front end portion of the side member is formed in a straight line without being bent. That is, parts such as a bracket for mounting the engine can be shared between the case where the front end portion of the side member is formed linearly and the case where the front end portion of the side member is bent.

  The rigidity and strength of the front part of the vehicle body can be improved without increasing the weight of the structure.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing the front structure of the cab over track, FIG. 2 is a side view showing the front structure of the cab over track, and FIG. 3 is a top view showing the chassis frame. 4 is an enlarged perspective view of the main part showing the front structure of the cab over track, FIG. 5 is a bottom view showing the front structure of the cab over track, and FIG. 6 is a top view showing the front structure of the cab over track. FIG. 7 is a perspective view of the front structure of the cab overtrack provided with the auxiliary bracket as viewed obliquely from below, and FIG. 8 is a top view showing a modification of the chassis frame. In the following description, the front-rear direction indicates the front-rear direction of the vehicle, and the inner-outer direction indicates the inner-outer side in the vehicle width direction.

  As shown in FIGS. 1 to 4, a pair of left and right side members 3 and a cross member 4 as a chassis frame 2 are provided at a lower front portion of a cab overtrack (vehicle) 1.

  A cab 5 is installed on the chassis frame 2, and the driver's seating position is generally located above the engine 8. A front under-run protector 6 extending along the vehicle width direction is disposed below the front end of the chassis frame 2 and connected to the chassis frame 2 via a pair of left and right brackets 7.

  The pair of side members 3 are arranged along the vehicle front-rear direction on both sides in the vehicle width direction, and have bent portions 3b integrally formed forward of the engine 8 by bending or the like. Of the pair of side members 3, the front end portion 3a ahead of the bent portion 3b extends linearly toward the outside in the vehicle width direction, and the distance between the side members 3 increases toward the front end. On the other hand, the rear part of the bent part 3b and the vicinity of the engine 8 extend in a straight line substantially parallel to the rear part. Further, a through hole 3c penetrating in the vehicle width direction is formed in the front end portion 3a of the side member 3, and a front cab mount (cab mount) 9 and a spring bracket 10a of a leaf spring 10 are fixed. Although not particularly shown, a bolt insertion hole for attaching the bracket 7 is formed on the lower end surface of the front end portion 3 a of the side member 3.

  The cross member 4 is disposed along the vehicle width direction and connects the front end portions 3a of the side members 3 to each other. Also, substantially elliptical through holes 4a are formed at both ends of the cross member 4 in the vehicle width direction, and a plurality of circular through holes 4b are formed inside the through holes 4a in the vehicle width direction. Although not particularly shown, bolt insertion holes for attaching the bracket 7 are formed at the lower portions of both ends of the cross member 4 in the vehicle width direction.

  As shown in FIGS. 4 and 5, the bracket 7 includes a base portion 13 which is disposed at a lower portion of the front end portion 3 a of the side member 3 and a lower outer end portion of the cross member 4 and extends downward, and a front end portion of the base portion 13. Formed in the vehicle width direction outside, the first fastening portion 14 extending in the vehicle width direction, the second fastening portion 15 formed in the front end portion of the base portion 13 extending inward in the vehicle width direction, and formed in the rear end portion of the base portion 13 in the vehicle width direction inner side. And a support portion 17 extending in the vehicle width direction at the lower end portion of the base portion 13.

  The base portion 13 includes an upper plate 13a, a rear plate 13b, a lower plate 13c, a pair of side plates 13d, and a front plate 13e that respectively define an upper end, a rear end, a lower end, both ends in the vehicle width direction and a front end of the base portion 13. (See FIG. 2).

  The upper plate 13 a contacts the front end 3 a of the side member 3 and the lower surface of the cross member 4. The rear plate 13b is joined to the rear end of the upper plate 13a and extends downward. The lower plate 13c is joined to the lower end of the rear plate 13b and extends toward the front lower side. The pair of side plates 13d has a front end formed in an arc shape and is joined to both ends in the vehicle width direction of the upper plate 13a, the rear plate 13b, and the lower plate 13c. The front plate 13e is joined to the front end portion of the side plate 13d. The front plate 13e, the lower plate 13c, the rear plate 13b, and the side plate 13d are provided with through holes 7a, respectively.

  The first fastening portion 14 is formed in a plate shape and has a bolt insertion hole 14 a for attaching the chassis frame 2. The first fastening portion 14 is in contact with the lower surface of the front end portion 3 a of the side member 3. The first fastening portion 14 is in contact with the lower surface of the front end portion 3 a of the side member 3, and the bolt insertion holes 14 a for attaching the chassis frame 2 and the bolts for attaching the brackets 7 of the side member 3 and the cross member 4. Bolts 18 are inserted into the respective insertion holes from below and fitted with nuts and tightened to be fastened and fixed to the front end 3a of the side member 3 and the outer end of the cross member 4 in the vehicle width direction. Is done.

  The second fastening portion 15 is formed in a plate shape and has a bolt insertion hole 15 a for attaching the cross member 4. The second fastening portion 15 is in contact with the lower surface of the outer end portion of the cross member 4 in the vehicle width direction. The second fastening portion 15 is in contact with the bolt insertion hole 15a for attaching the cross member 4 and the bolt insertion hole for attaching the bracket 7 in a state where the second fastening portion 15 is in contact with the lower surface of the outer end portion of the cross member 4 in the vehicle width direction. The bolts 18 are inserted from below and fitted with nuts and tightened to be fastened and fixed to the outer end of the cross member 4 in the vehicle width direction.

  The third fastening portion 16 is formed in a plate shape and has a bolt insertion hole 16 a for attaching the side member 3. The third fastening portion 16 is in contact with the rear surface of the first fastening portion 14 and the lower surface of the front end portion 3 a of the side member 3. The third fastening portion 16 is bolted from below to each of a bolt insertion hole 16a for attaching the side member 3 and a bolt insertion hole for attaching the bracket 7 in a state of contacting the lower surface of the front end portion 3a of the side member 3. By inserting 18 and fitting with a nut or the like and tightening, the front member 3 is fastened and fixed to the front end portion 3 a of the side member 3.

  The support portion 17 has a substantially L-shaped cross section, and is disposed rearward of the first fastening portion 14 and the second fastening portion 15 and forward of the third fastening portion 16, and the side member 3 is bent. It arrange | positions rather than the part 3b at the vehicle width direction outer side, and is joined to the lower end part of the front board 13e.

  The front underrun protector 6 is formed in a plate shape and is connected to the front end surface of the support portion 17 below the front end portion of the chassis frame 2.

  The front cab mount 9 includes a tilt hinge bracket 19 that is fastened to the front end portion 3 a of the side member 3 and extends upward, a cylindrical hinge portion 20 that is fixed to the tip of the tilt hinge bracket 19, and a rear side from the hinge portion 20. And a support portion 22 connected to the rear end portion of the arm 21 and extending upward. Front cab mount 9, front end 3 a of side member 3 and bracket 7, that is, tilt hinge bracket 19, hinge portion 20, arm 21, support portion 22, front end 3 a of side member 3, bracket 7, Are arranged in a substantially straight line in the vertical direction when viewed from the front of the vehicle (see FIG. 1).

  Each hinge part 20 has a through hole 20a, and the left and right through holes 20a face each other. A cab cross pipe 23 having a torsion bar (not shown) inserted therein is rotatably supported in the through hole 20a.

  As shown in FIG. 5, the cab 5 includes a floor panel 25 and a floor under frame 26. The floor panel 25 defines the lower end of the cab 5.

  As shown in FIGS. 1, 2, and 6, the floor underframe 26 has a pair of left and right underframe side portions 27 and an underframe rear portion 28.

  The pair of underframe side portions 27 extends substantially in parallel in the front-rear direction on both sides of the lower surface of the floor panel 25 in the vehicle width direction, and supports the floor panel 25 from below. A front end portion 27 a of the underframe side portion 27, which is a lower portion of the front end of the cab 5, is disposed above the hinge portion 20 and in front of the radiator 29 disposed between the front end portions 3 a of the pair of side members 3. A support portion 22 is fixed to the front end portion 27a of each underframe side portion 27, and the underframe side portion 27 and the front cab mount 9 are arranged in a substantially straight line in the vertical direction. That is, the underframe side portion 27, the front cab mount 9, the front end portion 3a of the side member 3, and the bracket 7 are arranged in a substantially straight line in the vertical direction. The pair of underframe side portions 27 is formed with a through hole 27b that penetrates in the vertical direction above the step pipe 11.

  The underframe rear portion 28 is disposed above the rear end portion of the engine 8 and connects between the rear end portions of the underframe side portions 27.

  The spring bracket 10 a of the leaf spring 10 is connected to the front end portions 3 a of the pair of left and right side members 3 behind the bracket 7, and the step pipe 11 is connected to each side behind the spring bracket 10 a of the leaf spring 10. The members 3 are connected to each other.

  The cab back cross member 12 is connected to each side member 3 behind the step pipe 11 and outside the rear end of the engine 8 in the vehicle width direction. Each cab back cross member 12 is formed in a substantially C shape when viewed from the outside in the vehicle width direction and extends upward. The upper end portion of each cab back cross member 12 is bent toward the inner side in the vehicle width direction and connected above the rear end portion of the engine 8. The upper end portion of the connected cab back cross member 12 is disposed below the rear portion 28 of the under frame so as to face each other.

  The rear part of the cab 5 is detachably fixed to the chassis frame 2 by a carb lock mechanism (not shown). By releasing the cab lock mechanism, the cab 5 can be tilted upward about the cab cross pipe 23. With such a tilt mechanism, the engine 8 and the like are exposed in a state where the cab 5 is tilted upward, and work such as inspection can be performed. Further, the vibration transmitted from the chassis frame 2 to the cab 5 is relieved by the spring function of the torsion bar of the cab cross pipe 23, and an assisting force is generated when the cab 5 is tilted forward.

  In the present embodiment, when the cab over truck 1 collides frontward with a small vehicle such as a passenger car, the front underrun protector 6 prevents the small vehicle from entering the cab over track 1 below. In such a case, the impact load acting on the front underrun protector 6 is transmitted to the chassis frame 2 via the bracket 7. Specifically, the impact load acting on the front underrun protector 6 includes the cross member 4 fixed to the first fastening portion 14 and the second fastening portion 15 of the bracket 7, the first fastening portion 14 and the third fastening portion. It is transmitted to the side member 3 fixed to 16.

  When the cab over truck 1 collides frontward with a large vehicle and an impact load is generated from the front with respect to the cab 5 or the underframe side portion 27, the impact load is generated from the floor underframe 26 provided on the floor panel 25. It is transmitted to the chassis frame 2 via the front cab mount 9, that is, the support portion 22, the arm 21, the hinge portion 20, and the tilt hinge bracket 19, and the impact energy at the time of collision is absorbed by the deformation of the chassis frame 2. .

  Thus, according to the present embodiment, the front end portion 3a of the side member 3 bent toward the outer side in the vehicle width direction is integrally formed, so that the front end portion 3a of the side member 3 is divided and configured as compared with the case where it is divided. High strength can be obtained.

  Further, since the bracket 7 is fixed to the front end portion 3a of the side member 3 and the cross member 4, when an impact load is applied to the front underrun protector 6, the first fastening portion 14 and the second fastening portion of the bracket 7 are used. The impact load is distributed and transmitted to the cross member 4 fixed to 15 and the side member 3 fixed to the first fastening portion 14 and the third fastening portion 16. For this reason, the attachment strength of each fastening part 14, 15, 16 can be ensured by the rigidity of each fastening part 14, 15, 16 without providing a separate reinforcing member or the like.

  Further, since the front end portion 3a of the side member 3 is bent outward in the vehicle width direction and the space between the front end portions 3a of the side members 3 is widened in the vehicle width direction, it is fixed to the front end portion 3a of each side member 3. The interval between the brackets 7 is wider in the vehicle width direction than when the front end portion 3a of the side member 3 is linear. For this reason, when the connection position of each bracket 7 with respect to the front underrun protector 6 is close to the outer end in the vehicle width direction of the front underrun protector 6 and an external force acts on the outer end in the vehicle width direction of the front underrun protector 6. The bending moment generated around the connection position of the bracket 7 with respect to the front underrun protector 6 can be kept small, and the longitudinal strength of the outer end portion in the vehicle width direction of the front underrun protector 6 is improved.

  In this way, the front end portion 3a of the side member 3 to be bent is integrally formed, and the bracket 7 is fixed to the front end portion 3a of the side member 3 and the cross member 4, so that the vehicle body does not increase in weight. The rigidity and strength of the front part can be improved. In other words, it is possible to reduce the thickness and weight of the members such as the bracket 7, the side member 3, and the front under-run protector 6 while maintaining the rigidity and strength of the front portion of the vehicle body.

  Further, since the underframe side portion 27, the front cab mount 9, and the front end portion 3a of the side member 3 are arranged in a substantially straight line when viewed from the front of the vehicle, the cab 5 or the underframe side The impact load generated in the portion 27 can be efficiently transmitted to the side member 3. Therefore, it is possible to effectively absorb the impact energy at the time of collision and suppress the deformation of the cab 5.

  Further, since the pair of underframe side portions 27 extend in the front-rear direction on both sides in the vehicle width direction on the lower surface of the floor panel 25, the strength of the lower end portions on both sides in the vehicle width direction of the cab 5 Therefore, deformation of the cab 5 at the time of offset collision or collision with the side surface of the cab 5 can be suppressed.

  Further, since the underframe side portion 27 is formed in a straight line, the strength in the front-rear direction of the underframe side portion 27 is improved, and the strength in the front-rear direction of the floor panel 25 is also improved. For this reason, when the impact load of the front-back direction arises in the cab 5, the deformation | transformation of the front-back direction of the floor panel 25 can be suppressed, and the living space of the cab 5 can be ensured. That is, by forming the underframe side portion 27 in a straight line, the floor underframe 26 can be made thinner and lighter without reducing the strength of the floor panel 25 in the front-rear direction.

  Further, the front end portion 3a of the side member 3 is bent outward in the vehicle width direction, so that the front end of the side member 3 is close to the front end portion of the cab over track 1 in the vehicle width direction. The strength of the front end in the width direction is improved. Thereby, the deformation | transformation of the cab 5 when an impact load acts with respect to the vehicle width direction outer-end front part of the cab over truck 1 can be suppressed.

  Further, since the bent portion 3b of the side member 3 is formed by bending, it is not necessary to newly form a mold for molding the bent side member 3.

  Further, since the bent portion 3b of the side member 3 is formed in front of the engine 8, and the front end portion 3a of the side member 3 to be bent is disposed in front of the engine 8, the front end portion 3a of the side member 3 is The engine 8 can be attached to the side member 3 by using the same attachment structure as that formed in a straight line without being bent. That is, parts such as the bracket for mounting the engine 8 can be shared when the front end portion 3a of the side member 3 is formed in a straight line and when the front end portion 3a of the side member 3 is bent.

  Further, by widening the space between the front end portions 3a of the side members 3, the radiator 29 arranged at the front end portion of the chassis frame 2 can be widened in the vehicle width direction. Thereby, the length of the radiator 29 in the vertical direction can be shortened, and the front end portion of the floor panel 25 can be made flatter.

  In the present embodiment, the case where the underframe side portion 27, the front cab mount 9 and the front end portion 3a of the side member 3 that are formed in a straight line are arranged in a substantially straight line in the vertical direction will be described. However, it suffices that at least the front end 27a of the underframe side portion 27 is arranged in a substantially straight line with the front cab mount 9 and the front end 3a of the side member 3 in the vertical direction. The frame side portion 27 may be formed to be bent.

  Further, the present invention is not limited to the case where the front end portion 3 a of the side member 3 is in front of the engine 8, and the bent portion 3 b is disposed behind the engine 8, and the engine 8 is disposed between the front end portions 3 a of the side members 3. May be. In such a case, an engine 8 mounting bracket for fixing the engine 8 to the front end portion 3a of the side member 3 may be provided.

  Furthermore, as shown in FIG. 7, an auxiliary bracket 30 may be provided on the inner side in the vehicle width direction than the bracket 7. When the auxiliary bracket 30 is provided, for example, one end 30 a may be connected to the lower end of the spring bracket 10 a of the leaf spring 10, and the other end 30 b may be connected to the front underrun protector 6 on the inner side in the vehicle width direction than the bracket 7. According to this configuration, by providing the auxiliary bracket 30 on the inner side in the vehicle width direction than the bracket 7, the strength in the front-rear direction of the front center of the front under-run protector 6 in the vehicle width direction is improved. Therefore, it is possible to secure the strength in the front-rear direction of the substantially center portion in the vehicle width direction while improving the strength of the outer end portion in the vehicle width direction of the front underrun protector 6.

  Further, as shown in FIG. 8, the second bent portion 3d is formed in front of the bent portion 3b of the side member 3, and the front end of each side member 3 is formed in a substantially parallel straight line toward the front. Good.

  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 should be added 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.

  The present invention is applicable to a front structure of a vehicle body having a side member, a cross member, a bracket, and a front under-run protector.

It is a front view which shows the front part structure of a cab over track. It is a side view which shows the front part structure of a cab over track. It is a top view which shows a chassis frame. It is a principal part expansion perspective view which shows the front part structure of a cab over track. It is a bottom view which shows the front part structure of a cab over track. It is a top view which shows the front part structure of a cab over track. It is the perspective view which looked at the front part structure of the cab overtrack provided with the auxiliary bracket from diagonally downward. It is a top view which shows the modification of a chassis frame.

Explanation of symbols

1 Cab over truck (vehicle)
3 Side member 3a Front end 4 Cross member 5 Cab 6 Front underrun protector 7 Bracket 8 Engine 9 Front cab mount (cab mount)
26 Floor under frame 27 Under frame side 27a Front end

Claims (4)

A pair of side members that are arranged along the front-rear direction on both sides in the vehicle width direction of the vehicle and each integrally have a front end portion that bends outward in the vehicle width direction;
A cross member connecting the front end portions of the pair of side members;
A pair of brackets respectively coupled to the front end portions of the pair of side members and the cross member;
A front underrun protector supported by the pair of brackets and extending in the vehicle width direction,
An upper plate is formed horizontally at the upper end of the base of the bracket, a lower end surface is formed horizontally at the lower end of the front end of the side member, and a lower end surface is formed at the lower end of the cross member,
The upper plate extends from the base portion to the vehicle width direction outer side and is in contact with and coupled to the lower end surface of the side member, and extends from the base portion to the vehicle width direction inner side to the cross member. A front structure of a vehicle body, comprising: a second fastening portion that is in contact with and coupled to the lower end surface . The vehicle body front structure according to claim 1,
The bracket has a third fastening portion that is coupled to the front end portion of the side member behind the coupling portion between the front under-run protector and the bracket ,
The front structure of the vehicle body, wherein the first fastening portion is coupled to the lower end surface of the side member in front of the coupling portion. The vehicle body front structure according to claim 1 or 2,
A pair of cab mounts fixed to each front end of the pair of side members and supporting the front end of the cab from below;
A pair of floor underframes extending in the front-rear direction at lower ends on both sides in the vehicle width direction of the cab, and
A front structure of a vehicle body, wherein a front end portion of the floor under frame, the cab mount, and a front end portion of the side member are arranged in a substantially straight line in the vertical direction. The vehicle body front structure according to claim 3,
The pair of floor under frames are formed linearly in the front-rear direction,
A front part structure of a vehicle body, wherein front end portions of the pair of side members are disposed in front of an engine mounted on the pair of side members.

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