JP2013014293A - Vehicle body front structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle body front structure which can secure a collision stroke to exert the proper absorption of a collision load from above even if a space of an engine room cannot be secured such as a light vehicle, in particular.SOLUTION: The vehicle body front structure includes an engine hood 17 sealing the engine room 13, a grill support 18 extending downward from the front lower face of a hood frame 16, and a front grill 19 provided at the front face of the grill support 18. In the grill support 18, there are included support joints 45a to 45e fixed by being welded to the hood frame 16 and folded backward of the vehicle body, and a hood stopper abutting face 47 on which a hood stopper 26 bearing the engine hood 17 at its both sides abuts. A portion (opposite joint) 44 opposite to the support joints 45a to 45e of the hood frame 16 is positioned behind the front end of the hood frame 16 and a portion (opposite joint) 44 opposite to the support joints 45a to 45e is tilted backward.

Description

  The present invention relates to a vehicle body front structure in which an engine hood is constituted by a hood skin and a hood frame, extends downward from a front lower surface of the hood frame, and has a front grill provided on the front surface of the grill support.

  The vehicle body front part structure includes a hood reinforcement structure in a vehicle body front part of an automobile. In this technology, the hood is composed of an outer panel and an inner panel, and a reinforcing plate is attached to the front end portion of the inner panel at the center of the vehicle body. A central frame that extends integrally from the front end of the vehicle, is provided on the support panel and is located at the center of the vehicle body, a grill is attached to the front side of the support panel, and a reinforcing plate is integrated downward along the back surface of the central frame. The extending portion and the extending portion of the reinforcing plate and the central frame are joined so that the cross section in plan view has a box shape.

  According to this vehicle body front part structure, the extension part of the reinforcing plate and the central frame are joined so that the cross section in plan view has a box shape, so that the strength of the central part of the hood can be improved ( For example, see Patent Document 1.)

  In addition, the vehicle body front structure includes a radiator grille mounting structure for attaching a radiator grille to a hood. In this technology, a clip bracket is provided on the back of the upper central portion of the radiator grille, and a bolt bracket for setting bolts rearward is provided on the back of the four corners around the radiator grill. Screw in the four corners of the front of the hood with the brackets temporarily attached.

  According to this front structure of the vehicle body, the clip for the radiator grille is temporarily fastened with screws to the four corners of the front portion of the hood, so that it is possible to improve the attachment of the radiator grille (for example, , See Patent Document 2).

  There is another body front structure that attaches the radiator grille to the hood. In this technology, a radiator grill is composed of a frame body portion and a grill portion, and a radiator grille is formed by combining these frame body portion and grill portion, and is attached to a caulking portion of a hood composed of an outer panel and an inner panel. A hole is formed, a bolt is inserted into the mounting hole, and a nut is screwed into the bolt to attach the radiator grille. Furthermore, the radiator grille extends to the lower part of the frame body part corresponding to the lower part of the grill part to form a hollow part.

  According to this vehicle body front portion structure, since the hollow portion is formed in the radiator grill, it is possible to improve the strength of the radiator grill (for example, see Patent Document 3).

  On the other hand, the vehicle body front structure includes a lamp structure that takes into account the effect of rubbing the hood rubber (hood seal). In this technique, a protrusion is formed on the top surface of the outer lens at a portion where the hood rubber comes into contact, a coating is applied to the front portion of the protrusion, and the surface has a micro uneven surface on the rear portion of the protrusion. A lens step is formed.

  According to this vehicle body front part structure, for example, even if the rubbing occurs due to the hood rubber coming into contact with the lens step, the blind function of the lens step itself can be maintained (see, for example, Patent Document 4). .

  Further, the vehicle body front structure includes a seal structure with a hood seal attached to the front end of the engine hood. This technology is a hood seal that seals the gap between the engine hood and the radiator grille, with the bead (shielding bead) protruding forward from the front end of the mounting base toward the front end of the engine hood. It is.

  According to this vehicle body front part structure, since the bead (shielding bead) is formed to protrude, the gap between the engine hood and the radiator grille can be made inconspicuous (see, for example, Patent Document 5).

JP 11-29070 A JP-A-7-304409 JP-A-9-58384 Japanese Patent Laid-Open No. 7-85702 JP 2006-21547 A

  In the vehicle body front part structure of Patent Document 1, since the attachment to the hood frame constituted by the extended portion of the inner panel and the support panel is only at the center of the vehicle width, the strength required when the hood is closed when the grill is a large vehicle type ( In particular, when strong closed) and wind resistance against running wind pressure cannot be secured, the hood lock is at the top, so the collision stroke cannot be secured, and there is a high possibility that appropriate pedestrian protection (impact load absorption from above) will not be performed. .

  In the vehicle body front structure disclosed in Patent Documents 2 and 3, especially in a vehicle type that cannot secure a space in an engine room such as a light vehicle, pedestrian protection (absorption of impact load from above) and improvement of running wind pressure resistance are reduced in a small space. It cannot be realized. In addition, since the bolt is fixed to the hood frame, there is a high possibility that impact load absorption from above is not properly performed.

Here, the vehicle body front structure of Patent Documents 4 and 5 is that the hood seal is not visible from the appearance, and the downward load input at the time of strong closing is absorbed to damage the lamp body at the time of strong closing. Prevents rainwater from entering the lamp body, prevents drying deterioration due to the hood seal directly receiving the heat of the lamp body, and prevents noise and vibration due to contact between the seal and lamp body doing.
Thus, when sealing between the engine hood and the lamp in the vehicle body front structure, a structure capable of preventing further rainwater intrusion, preventing dry deterioration, and preventing noise and vibration is desired.

The present invention can protect the pedestrian (from above) by securing the collision stroke and appropriately absorbing the impact load from above, even in the case of a vehicle model that cannot secure the engine room space such as a light vehicle. It is an object of the present invention to provide a vehicle body front structure that can achieve improvement in impact load absorption and running wind pressure resistance in a small space.
It is another object of the present invention to provide a vehicle body front structure that can prevent further rainwater intrusion, prevent drying deterioration, and prevent noise and vibration when sealing between an engine hood and a lamp body.

  The invention according to claim 1 is an engine hood comprising a hood skin that closes the engine room and a hood frame provided on the back surface of the hood skin, a grill support that extends downward from the front lower surface of the hood frame, and a front surface of the grill support. A front grille structure that includes a front grille, a support joint that is welded to the hood frame and bent to the rear of the vehicle, and a hood stopper that supports the engine hood on both sides. A hood frame, and a portion of the hood frame facing the support joint is located behind the front end of the hood frame, and a portion of the hood frame facing the support joint is inclined backward (in a rearward inclination). Formed).

  The invention according to claim 2 is characterized in that the grill support has a notch between the plurality of support joints.

  According to a third aspect of the present invention, the grill support includes a support reinforcing member provided above the hood stopper abutting surface and straddling the lower surface of the hood frame and the grill support. Is an open shape.

  According to a fourth aspect of the present invention, the grille support includes a striker that engages with a hood lock provided at an upper part of the bulkhead at a vehicle width center, the striker engages with the hood lock, and a loop bracket that supports the loop. The loop bracket is provided across the lower surface of the hood frame and the grille support, and the loop is installed below the grille support.

  The invention according to claim 5 is characterized in that the loop bracket is provided with a fragile portion near the center of the vehicle body in the vertical direction.

  The invention according to claim 6 is characterized in that the grill support is provided with a heat-resistant seal attached along the lower end.

  According to a seventh aspect of the present invention, there is provided a vehicle body front structure comprising: an engine hood comprising a hood skin that closes the engine room and a hood frame provided on the back surface of the hood skin; The hood frame includes a hood seal that absorbs an impact load, a seal mounting portion that attaches the hood seal, and a seal pressing portion that crushes the hood seal when a load is input from above in front of the seal mounting portion. The lamp body is provided with a seal contact surface at a position facing the seal pressing portion when the engine hood is closed, and the lower end of the hood seal is separated from the seal contact surface with the engine hood closed.

  The invention according to claim 8 is characterized in that the hood seal includes a hollow portion formed in a hollow cylindrical shape.

  The invention according to claim 9 is characterized in that the root vicinity of the hollow portion of the hood seal abuts on the seal pressing portion.

  The invention according to claim 10 is characterized in that the hood frame is provided with a grill support extending downward from the front lower surface and a front grill provided on the front surface of the grill support, and the hood seal is located on the left and right sides of the grill support. And

  The invention according to claim 11 is characterized in that the hood seal is in contact with the lower surface of the hood frame in front of the seal mounting portion.

  The invention according to claim 12 is characterized in that the lower end of the hood seal is positioned above the front end of the engine hood in a side view when the engine hood is closed.

The present invention has the following effects.
In the invention according to claim 1, an engine hood comprising a hood skin that closes the engine room and a hood frame provided on the back surface of the hood skin, and a grille support that extends downward from the front lower surface of the hood frame. And a front grill provided on the front surface of the grill support.
For example, in a light vehicle having a large front grille by design, if the front grille and the grille support that supports the front grille are fixed to the vehicle body side, these rigid members will adversely affect load absorption when a load is input from above. In the vehicle body front structure, the grille support and the front grille are provided on the front lower surface of the hood frame of the engine hood.
A hood frame support joint having a support joint portion that is welded and fixed to the hood frame and bent to the rear of the vehicle body and a hood stopper contact surface that abuts against the hood stopper that supports the engine hood on both sides. The part facing the part is located behind the front end of the hood frame, and the part facing the support joint part is tilted backward (formed in a rearward tilt).
For example, if the grill support is bolted to the hood frame, the strength of the fixing portion is too high, which adversely affects the fixing.
If the hood stopper provided at the top of the bulkhead comes into contact with the hood stopper contact surface when a load is input, for example, the load absorption will be adversely affected, so the support joint will be folded backwards and the part facing the support joint of the hood frame Is positioned rearward of the front end of the hood frame and tilted rearward to move the upper part of the grill support backward and slide the lower part of the grill support forward (rotate rearward around the hood stopper contact surface as an axis). ) The load is released so that the load absorption by the hood skin-hood frame is not hindered.
In other words, the space of the engine room such as a light vehicle cannot be ensured by dispersing the support joints in a plurality of fixed locations as spot welding, for example, and preventing the load absorption by the hood skin and the hood frame. Even if it is a vehicle type etc., a collision stroke can be ensured and the impact load absorption from the upper direction can be performed appropriately. As a result, pedestrian protection (impact load absorption from above) and improved wind pressure resistance can be achieved in a small space.

  In the invention according to claim 2, since the grill support has notches between the plurality of support joints, the grill support is lifted from the load input point in front of the hood frame to ensure a stroke, and the engine is input when the load is input from above. The deformation of the hood was not disturbed. Thereby, the impact load at the time of hood closing or a pedestrian contact can be absorbed better.

In the invention according to claim 3, the grill support includes a support reinforcing member provided over the hood stopper lower surface and the lower surface of the hood frame and the grill support.
The support reinforcing member is located above the hood stopper contact surface, which is the part where the load rises when a load is input from above, and the support reinforcing member is formed in a U shape in cross section and the upper and lower ends are open. The strength in the vicinity of the left and right ends of the grill support can be adjusted so as not to adversely affect load absorption while performing necessary reinforcement.

In the invention which concerns on Claim 4, the striker which engages with the hood lock provided in a bulkhead upper part is provided in a grille support in the vehicle width center. A striker that engages with a hood lock provided at the upper part of the bulkhead is provided at the center of the vehicle width on the grill support.
The striker consists of a loop that engages the hood lock and a loop bracket that supports the loop, and the loop bracket is provided across the lower surface of the hood frame and the grill support, so that the loop is disposed below the grill support. can do. That is, by arranging the loop below the grill support, load absorption from above by the hood frame can be improved. By straddling the lower surface of the hood frame and the grill support, the strength required for the grill support can be secured, and a reinforcement function of a reinforcement that reinforces the load on the hood skin when the hood is attached can be provided.

  In the invention according to claim 5, since the weak portion is provided in the vicinity of the center of the vehicle body in the vertical direction of the vehicle body, in addition to the effect of claim 4, the weak portion can be broken when a load is input from above. As a result, load absorption is not adversely affected.

  In the invention which concerns on Claim 6, since the heat-resistant seal attached along a lower end was provided in the grille support, the heat | fever of a radiator can be interrupted | blocked. In the vehicle body front structure according to the present invention, since the hood lock is disposed below the normal, a heat-resistant seal is provided along the lower end of the grill support so that the heat of the radiator does not become high in consideration of when the hood is opened and closed. Provided.

In the invention according to claim 7, an engine hood comprising a hood skin that closes the engine room and a hood frame provided on the back surface of the hood skin, and a lamp body that is provided on the left and right of the engine hood below the vehicle body front structure. Prepared.
The hood frame is provided with a hood seal that absorbs an impact load, a seal attachment portion that attaches the hood seal, and a seal pressing portion that crushes the hood seal when a load is input from above in front of the seal attachment portion. The lamp body was provided with a seal contact surface at a position facing the seal pressing portion with the engine hood closed, and the lower end of the hood seal was separated from the seal contact surface with the engine hood closed.
That is, a seal pressing portion is formed on the hood frame, a seal contact surface is formed on the upper surface of the lamp body, and these are arranged so as to be substantially parallel, so that the hood seal tip (hollow portion) can be sandwiched and crushed. It is possible to absorb the input load from above when the engine hood is strongly closed.
This prevents rainwater from entering the lamp body caused by damaging the lamp body whose tip is provided below the engine hood when the engine hood is tightly closed, and drying deterioration due to the hood seal receiving the heat of the lamp body directly It is possible to prevent noise and vibration due to the contact between the hood seal and the lamp body.

  In the invention according to claim 8, since the hood seal has a hollow portion formed in a hollow cylindrical shape, the hood seal is easily sandwiched between the seal pressing portion and the seal contact surface, and the function and effect of claim 7 are more effective. Demonstrated.

  In the invention which concerns on Claim 9, since the base vicinity of the hollow part of a hood seal contact | abuts to a seal press part, it becomes easy to pinch between a seal press part and a seal contact surface, and it becomes the effect of Claim 7 and Claim 8 easily. Is more effective.

  In the invention according to claim 10, the hood frame is provided with a grill support extending downward from the front lower surface and a front grill provided on the front surface of the grill support, and the hood seal is located on the left and right of the grill support. Without providing a seal on the entire front face of the engine hood, it can be set in a position, size, and range as required.

  In the invention according to claim 11, since the hood seal is in contact with the lower surface of the hood frame in front of the seal mounting portion, the upper portion of the hood seal can be fixed by the seal mounting portion, and the front thereof is always along the lower surface of the hood frame. Since it is pressed upward, the desired seal performance can be exhibited without the hood seal being displaced due to load input from above or vibration.

  In the invention according to claim 12, since the lower end of the hood seal is positioned above the front end of the engine hood in a side view when the engine hood is closed, there is a gap between the hood seal and the upper surface of the lamp body. However, when the engine hood is closed, it becomes difficult to see the hood seal from the front of the vehicle body, and the appearance is improved.

It is a perspective view which shows the front part of the vehicle body by which the vehicle body front part structure which concerns on this invention was employ | adopted. It is the perspective view which looked at the engine hood of the vehicle body front part structure shown by FIG. 1 from the back surface. FIG. 3 is a perspective view of a hood frame and a grille support of the vehicle body front structure shown in FIG. 2. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is an enlarged view of part 5 of FIG. 4. FIG. 6 is an enlarged view of 6 parts in FIG. 4. FIG. 3 is a perspective view of a grille support of the vehicle body front structure shown in FIG. 2. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7. FIG. 9 is an enlarged view of 9 parts in FIG. 2. FIG. 3 is an enlarged view of 10 parts in FIG. 2. It is the 11-11 line sectional view of Drawing 1. It is a perspective view of the lamp body of the vehicle body front structure shown in FIG. FIG. 3 is an enlarged view of a portion 13 in FIG. 2. FIG. 2 is a perspective view showing a state in which a hood seal of the engine hood of the vehicle body front structure shown in FIG. 1 is removed. FIG. 3 is a perspective view of the hood seal of the vehicle body front structure shown in FIG. 2 as viewed obliquely from above. FIG. 2 is an operation explanatory diagram for strongly holding the hood of the vehicle body front part structure shown in FIG. 1. It is an analysis figure which shows the upper collision analysis result of the vehicle body front part structure shown by FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

As shown in FIGS. 1 to 4, the vehicle 10 includes an engine hood 17 including a hood skin 15 that closes the engine room 13 and a hood frame 16 provided on the back surface of the hood skin 15 at the front portion of the vehicle body 11. A grille support 18 extending downward from the front lower surface of the hood frame 16; a front grille 19 provided on the front surface of the grille support 18; lamps 21 and 21 provided below the engine hood 17 and on the left and right sides of the front grille 19; A front bumper face 22 provided below the grille 19 and the lamp bodies 21, 21, a front fender 23 covering the side of the vehicle body on the side of the lamp body 21 and the front bumper face 22, a grill support 18 and a front bumper face 22 And a bulkhead 24 (see FIG. 4) provided on the rear side.
4 is a cross-sectional view taken along line 4-4 of FIG.

  The front grille (grill) 19 is a design part provided on the front surface of the grill support 18 and is also an introduction port for introducing running wind into the engine room 13.

The bulkhead (front bulkhead) 24 has upper and lower hood stoppers 26 and 26 (one not shown) that support the engine hood 17 when the hood is closed, and a hood lock 27 that locks the engine hood 17. Is provided. Further, a radiator 25 for cooling the engine is supported.
Note that the hood stopper 26 is set about 300 mm outward from the center of the vehicle width.

  As shown in FIGS. 1 and 2, the vehicle body front part structure is a structure around the engine hood 17 including the engine hood 17, the grill support 18, the front grille 19, and the left and right lamp bodies 21 and 21. A vehicle body front structure (hood structure) advantageous for pedestrian protection performance is realized by spot welding instead of bolting the grille support 18 to the hood frame 16 of the engine hood 17.

  In the vehicle body front structure, as shown in FIG. 2, the hood seal (hood seal rubber) 34 disposed at a position invisible from the front of the vehicle body is disposed on the left and right of the front end of the hood frame 16 (engine hood front end 17a). In addition, both the absorption of the input load when the hood is tightly closed and the appearance improvement are compatible.

The engine hood assembly 31 includes a hood skin 15 that closes the engine room 13, a hood frame 16 provided on the back surface of the hood skin 15, a grill support 18 that extends downward from the front lower surface of the hood frame 16, and a grill support 18. Front grille 19 provided on the front surface, striker 32 provided across the lower surface of the hood frame 16 and the grill support 18, and left and right support reinforcement provided across the lower surface of the hood frame 16 and the grill support 18 It consists of members (grill support stiffeners) 33, 33 and hood seals 34, 34 provided on the left and right of the front end of the hood frame 16 to absorb impact loads.
Note that the left and right support reinforcing members 33 are symmetrical members.

  The engine hood assembly 31 has a unique shape in which a front grille 19 usually provided on the vehicle body side and a grille support 18 on the rear side thereof are provided below the hood frame 16.

  The engine hood 17 includes a hood skin 15 that closes the engine room 13 and a hood frame 16 provided on the back surface of the hood skin 15.

As shown in FIGS. 3 to 7, the hood frame 16 is formed of a cold rolled material (JSC270D steel material) having a thickness of 0.5 t. Further, the hood frame 16 includes a hood frame side joint portion 36 to which the grill support 18 is joined, and seal attachment portions 37 and 37 (see also FIG. 14) that are provided on the left and right front sides of the hood frame 16 and attach the hood seal 34. A seal pressing portion 38 that crushes the hood seal 34 when a load is input from above is provided in front of the seal mounting portion 37, and a reinforcement 39 that reinforces the load on the hood skin 15 when the hood is attached.
The seal attachment portion 37 (see FIG. 14) is provided with a plurality of clip holes 37a for clipping the hood seal 34.

  The hood frame 16 can also be said to be provided with a grill support 18 extending downward from the front lower surface (the lower front surface of the vehicle body) and a front grill 19 provided on the front surface of the grill support 18.

  The hood frame 16 (the hood frame side joint portion 36) has a portion (joint joint portion) 44 facing the support joint portions 45a to 45e (see FIG. 7) located behind the front end of the hood frame 16, and the support joint portion 45a. The part (joining opposing part 44) which opposes -45e inclines backward (it formed in the back inclination).

  That is, the hood frame side joint portion 36 is located rearward from the front end of the hood frame 16, and the hood frame side joint portion 36 itself is also tilted rearward to facilitate the rotation of the grille support 18 and receive when a load is input from above. A plane portion serving as a surface is secured, and a mounting space for a front grille (grill) 19 is secured in front of the grill support 18.

  The lean reinforcement 39 includes a front leg joint 41 and a rear leg joint 42 joined to the hood frame 16.

  The grill support 18 (see FIGS. 1 and 2) is a member that is positioned between the hood frame 16 and the lamp bodies 21 and 21 and extends downward from the front lower surface of the hood frame 16. It is formed of cold rolled material (JSC270D steel material) having a plate thickness of 0.8 t.

The grill support 18 is fixed to the hood frame 16 by welding and bent to the rear of the vehicle body, and a plurality of support joints 45a to 45e, notches 46a to 46d provided between the plurality of support joints 45a to 45e, and an engine It is sandwiched between a hood stopper abutment surface 47 against which the hood stopper 26 that supports the hood 17 on both sides abuts, left and right intake ports 48, 48 for allowing outside air to flow into the engine room 13, and left and right intake ports 48, 48. And a central reinforcing portion 49 formed as described above.
The hood stopper 26 is formed above the bulkhead 24 (see FIG. 4).

  Further, the grill support 18 is provided with a heat-resistant seal 51 attached along the lower end 18a of the grill support 18 and left and right support reinforcements provided above the hood stopper abutting surface 47 and straddling the lower surface of the hood frame 16 and the grill support 18. Members 33 and 33 and a striker 32 that is provided at the center of the vehicle width of the grill support 18 and that engages with a hood lock 27 provided on the top of the bulkhead 24 are provided.

The plurality of support joints 45a to 45e are joined to the lower surface of the hood frame 16 by eight-point spot welding. This is because if the bolts are used, the strength is too high and load absorption from above is deteriorated.
By making the support joints 45a to 45e tilt backward (rear tilt), proper load absorption can be realized by the grill support 18 itself rotating when a load is input from above.

  The notches 46a to 46d are provided so as not to adversely affect the impact load from above, and the grill support 18 is notched except for the support joints 45a to 45e. In other words, by floating from the hood frame 16, the hood frame 16 can be deformed and a stroke from the load input point can be secured.

  The hood stopper abutment surface 47 serves as a central axis that supports the entire hood (engine hood assembly 31) with the bulkhead 24 when the hood is closed and rotates backward when a load is applied from above. The hood stopper contact surface 47 is formed to be horizontal or substantially backward inclined (substantially backward inclined).

  The air inlet 48 is crushed (stamped) at the top, and the end is reinforced to fix the work jig for conveyance. That is, the intake port portion 48 plays a role of reducing the weight of the grill support 18 and the work jig insertion hole as well as an intake function for applying traveling wind from the front to the radiator 25 (see FIG. 4).

  The central reinforcing portion 49 is formed in a hat shape in a sectional view, and improves the strength of the grille support 18 due to its own weight, traveling wind pressure from the front, and load applied when the hood is opened and closed.

  7 and 8, the heat-resistant seal (seal material) 51 is made of PP (polypropylene) foam material having a plate thickness of 2t. The engine hood 17 is provided so as not to be heated when the hood is opened by receiving heat from the radiator 25 (see FIG. 4) supported by the bulkhead 24. Furthermore, the upper part of the heat-resistant seal 51 is fixed by a plurality of clips 54, and is always supported so as to be pressed along the lower end 18 a of the grill support 18. Thereby, the operator who opens and closes the engine hood 17 can be protected without shifting due to load input or vibration.

  As shown in FIG. 9, the support reinforcing member (grill support stiffener) 33 is U-shaped in cross-sectional view and has an open shape at the upper and lower ends. Further, a cold rolled material (JSC270C steel material) having a plate thickness of 0.75 t is used, and the half-end plate thickness is determined as a result of a balance between load absorption from the upper side and necessary strength.

  The upper portion of the support reinforcing member 33 is spot-welded to the hood frame 16 at two points, and the lower portion is spot-welded to the grill support 18 at three points. The support reinforcing member 33 is a portion where a load rises when a load is input from above. It is located above the hood stopper 26 (see FIG. 4). It is necessary to prevent the load absorption from above from being adversely affected while performing the necessary reinforcement, and the balance is achieved by adjusting the plate thickness, shape, and weld spot position.

  In the support reinforcing member 33, the upper welding points (welding flanges) 58 a and 58 b are inclined backward as in the grill support 18. The lower welding points (welding flanges) 59a to 59c balance the load absorption from the upper side with the required strength, particularly by the position of the inner upper welding point (welding point 59c, see FIG. 9).

  Gaps S1 and S2 are provided between the upper welding points 58a and 58b and the lower welding points 59a and 59b, respectively. That is, a gap S <b> 1 is formed between the upper portion of the support reinforcing member 33 and the hood frame 16, and a gap S <b> 2 is formed between the lower portion of the support reinforcing member 33 and the grill support 18.

  Further, the support reinforcing member 33 is formed in a generally hat shape in an open sectional view from the hood frame 16 toward the grill support 18. Thereby, the strength against the load applied when the grille support 18 self-weight, the traveling wind pressure from the front, and the hood are opened is improved. Furthermore, the upper and lower ends are opened and a thin hat shape is used to balance the load absorption from the upper side with the required strength.

As shown in FIG. 10, the striker 32 includes a loop 56 that engages the hood lock 27 and a loop bracket 57 that supports the loop 56. The loop bracket 57 is a cold plate having a thickness of 1.2 t. A rolled material (JSC270C45-45 steel material) is used, and it is attached across the lower surface of the hood frame 16 and the grill support 18.
The loop 56 is installed below the grill support 18. The loop bracket 57 can also be seen as a substantially S-shaped cross-sectional view in a side cross-section.

  The loop bracket 57 includes an upper joint 61 joined to the hood frame 16, a lower joint 62 joined to the grill support 18, an opening 63 provided near the center of the vehicle body in the vertical direction, and strength and rigidity by stamping. The left stamp part 64a, the right stamp part 64b and the central stamp part 64c are provided on the left and right sides of the opening part 63, and the beads 65 and 65 project forward and extend from the opening part 63 to the hood frame 16. A reinforcing leg 66 and a bracket step portion 67 to which one end 56a of the loop 56 is attached are provided. The other end 56 b of the loop 56 is attached to the grill support 18 side of the lower joint portion 62.

  Specifically, one end 56 a of the loop 56 is sandwiched between the bracket step portion 67 and MIG welded to the bracket step portion 67, and the other end 56 b of the loop 56 is sandwiched between the lower joint portion 62 and the MIG to the lower joint portion 62. Welded.

The upper joint portion 61 is spot-welded to the hood frame 16 at four points, and is inclined rearward similarly to the grill support 18. The upper joint portion 61 is joined at the same position as the rear leg joint portion 42 of the reinforcement 39 (see FIGS. 4 and 6), and also serves as a reinforcement when a load is input from above. The lower joint 62 is spot welded to the grill support 18 at three points.
The left, right, and center stamp portions 64a, 64b, and 64c improve the strength against the load applied to the loop bracket 57 when a load is input from above or when the load is strongly closed.

The bead 65 appropriately breaks load absorption by being broken when a load is input from above.
The reinforcing legs 66 prevent the grill support 18 from being distorted or displaced when the grill support 18 is assembled to the hood frame 16 and the hood frame 16 with the grill support 18 is carried out.

  The fragile portion 68 is provided in the vicinity of the center of the vehicle body in the vertical direction, and includes an opening 63 and beads 65 and 65. The fragile portion 68 has a function of appropriately absorbing the weight of the loop bracket 57 and the load input from above.

  As shown in FIGS. 11 to 15, the lamp body 21 includes a seal contact surface 71 at a position facing the seal pressing portion 38 in a state where the engine hood 17 is closed. The seal abutment surface 71 was separated from the hood seal lower end 34a with the engine hood 17 closed.

  The hood seal 34 is a member that is located on the left and right sides of the grill support 18 and is attached to the seal attachment portion 37 of the hood frame 16. Further, the hood seal 34 is attached to a seal attaching portion 37, an attached portion 74, a general portion 75 continuously extended from the attached portion 74, and a hollow cylindrical shape extending from the general portion 75. A formed hollow portion 76. Furthermore, PP (polypropylene) foam material is used for the hood seal 34.

The attached portion 74 is provided with a plurality of through holes 74 a penetrating the clip 77, and is fixed to the seal attaching portion 37 of the hood frame 16 by the plurality of clips 77. The seal attachment portion 37 is provided with a plurality of clip holes 37a in which the clips 77 are locked.
The hollow portion 76 is formed in a tip water droplet shape and hollow in a sectional view. The vicinity of the root 76 a of the hollow portion 76 of the hood seal 34 abuts on the seal pressing portion 38.

  That is, the vicinity of the root 76 a of the hollow portion 76 of the hood seal 34 is brought into contact with the seal pressing portion 38 so that the hollow portion (water droplet-like portion) 76 is sandwiched between the seal pressing portion 38 and the seal contact surface 71 and crushed. It can absorb the load from above at the time of strong closing.

As shown in FIG. 11, the hood seal tip 34b is located rearward by the dimension S3 of the engine hood front end 17a. Further, the hood seal 34 is in contact with the lower surface of the hood frame 16 in front of the seal mounting portion 37, and the hood seal lower end 34a is a dimension S4 from the front end 17a of the engine hood in a side view when the engine hood 17 is closed. Located above.
Thereby, even if there is a gap S5 between the hood seal 34 and the upper surface of the lamp body 21, the hood seal 34 is difficult to see from the front of the vehicle body and the appearance is improved.

FIGS. 16 (a) and 16 (b) are diagrams for explaining the operation of the vehicle body front structure when the hood is strongly closed.
As shown in (a), in the vehicle body front structure, the hood seal 34 forms a seal pressing portion 38 on the hood frame 16 and forms a seal contact surface 71 on the upper surface of the lamp body 21. The portion 38 and the seal contact surface 71 were arranged so as to be substantially parallel.

  As shown in (b), even when the engine hood 17 is closed with a strong load as indicated by the arrow a1, the hollow portion (water droplet-like portion) 76 of the hood seal 34 is connected to the seal pressing portion 38 and the seal contact surface. 71 can be pinched and crushed, and the load from above at the time of strong closing can be absorbed appropriately.

  Since the hood seal 34 has fixed the mounted portion 74 (see FIG. 13) on the upper portion of the hood seal 34, the hood seal 34 always exhibits the assumed sealing performance without being displaced upwardly by a pressing load input or vibration along the lower surface of the hood frame 16. it can.

  Since the gap S5 (see FIG. 11) is set between the hood seal 34 and the seal contact surface (upper surface) 71 of the lamp body 21, the hood seal 34 does not contact the lamp body 21 even when the hood is closed. Absent. As a result, rainwater intrusion into the lamp body 21 due to damage to the lamp body 21 at the time of strong closing, drying deterioration due to the hood seal 34 directly receiving the heat of the lamp body 21, and the hood seal 34 and the lamp body 21 Noise and vibration due to contact can be prevented.

17 (a) to 17 (d) show the upper collision analysis results on the outer side (substantially hood stopper 26 position cross section) about 300 mm from the center of the vehicle width. The unit of t is second.
(A) shows the vehicle body 11 in the initial state (t = 0).
A test ball 79 is applied to the engine hood 17 as shown by an arrow b1.

  (B) The state of the vehicle body 11 after t = 5 has been shown. At t = 5, the hood skin 15 and the hood frame 16 come into contact with each other, the hood frame 16 is pushed substantially in parallel as indicated by an arrow b2, and the input load is absorbed at the front end of the hood frame 16. The upper portion of the grill support 18 is pushed rearward, and the grill support 18 starts to rotate as indicated by an arrow b3 with the hood stopper 26 as an axis.

  (C) The state of the vehicle body 11 after t = 8 has elapsed. When the upper portion of the grill support 18 rotates backward at t = 8, the grill support 18 slides forward as indicated by an arrow b4 from the hood stopper 26 (the loop 56 shown in FIG. Move forward by that amount). Since the entire front grille 19 is pushed forward, load absorption is not adversely affected.

  (D) The state of the vehicle body 11 after t = 15 has been shown. Further, the front grill 19 slides forward as indicated by the arrow 5b, further promoting load absorption.

  As shown in FIGS. 1 to 7, in the vehicle body front structure, an engine hood 17 including a hood skin 15 that closes the engine room 13 and a hood frame 16 provided on the back surface of the hood skin 15, and the front of the hood frame 16. A grill support 18 extending downward from the lower surface and a front grill 19 provided on the front surface of the grill support 18 were provided.

  For example, in a light vehicle having a large front grille by design, if the front grille and the grille support that supports the front grille are fixed to the vehicle body side, these rigid members will adversely affect load absorption when a load is input from above. In the vehicle body front structure, the grill support 18 and the front grill 19 are provided on the lower front surface of the hood frame 16 of the engine hood 17.

  The grill support 18 has support joints 45a to 45e that are welded and fixed to the hood frame 16 and bent toward the rear of the vehicle body, and a hood stopper contact surface that abuts against the hood stopper 26 that supports the engine hood 17 on both sides. A portion (joint joint portion) 44 facing the support joint portions 45a to 45e of the hood frame 16 is located behind the front end of the hood frame 16 and a portion (joint joint portion) 44 facing the support joint portions 45a to 45e. Is tilted backwards.

  For example, if the grill support 18 is bolted to the hood frame 16, the strength of the fixing portion is too high, which adversely affects the fixing portion.

  If the hood stopper 26 provided on the top of the bulkhead 24 abuts against the hood stopper abutment surface 47 when a load is input, for example, the load absorption is adversely affected. Therefore, the support joints 45a to 45e are bent rearward and the hood frame 16 A portion (joining facing portion) 44 facing the support joint portions 45a to 45e is positioned rearward from the front end of the hood frame 16 and tilted rearward (rear tilting), thereby moving the grill support 18 upward to the rear. The load under the grille support 18 is slid forward (rotated rearward with the vicinity of the hood stopper contact surface 47 as an axis) to release the load so that the load absorption by the hood skin 15 and the hood frame 16 is not hindered.

  That is, the support joints 45a to 45e are dispersed in a plurality of fixing points, for example, as spot welding, and the load absorption by the hood skin 15 and the hood frame 16 is not inhibited, so that an engine room such as a light vehicle in particular. Even in the case of a vehicle type or the like for which 13 spaces cannot be secured, the impact stroke can be appropriately absorbed from above by securing the collision stroke. As a result, pedestrian protection (impact load absorption from above) and improved wind pressure resistance can be achieved in a small space.

  As shown in FIG. 7, in the vehicle body front structure, the grill support 18 has notches 46 a to 46 d between the plurality of support joints 45 a to 45 e, so that the grill support from the load input point in front of the hood frame 16. 18 was lifted to secure a stroke so that deformation of the engine hood 17 (see FIG. 4) was not hindered when a load was input from above. Thereby, the impact load at the time of hood closing or a pedestrian contact can be absorbed better.

  As shown in FIGS. 4 and 9, in the front body structure of the vehicle body, the grill support 18 has a support reinforcing member 33 provided above the hood stopper abutting surface 47 and straddling the lower surface of the hood frame 16 and the grill support 18. Prepare.

  Since the support reinforcing member 33 is positioned above the hood stopper abutment surface 47, which is a portion where the load rises when a load is input from above, the support reinforcing member 33 is configured to have a U shape in cross section and an open shape at the upper and lower ends. The strength in the vicinity of the left and right ends of the grille support 18 can be adjusted so as not to adversely affect load absorption while performing necessary reinforcement on the same part.

  As shown in FIGS. 4, 6, and 10, in the vehicle body front portion structure, the grill support 18 is provided with a striker 32 that engages with a hood lock 27 provided on the top of the bulkhead 24 at the vehicle width center. A striker 32 that engages with a hood lock 27 provided on the upper part of the bulkhead 24 is provided in the grill support 18 at the center of the vehicle width.

  The striker 32 includes a loop 56 that engages with the hood lock 27 and a loop bracket 57 that supports the loop 56, and the loop bracket 57 is provided across the lower surface of the hood frame 16 and the grill support 18. A loop 56 can be disposed below the grill support 18. That is, by arranging the loop 56 below the grill support 18, load absorption from above by the hood frame 16 can be improved. The loop bracket 57 straddles the lower surface of the hood frame 16 and the grill support 18 to ensure the strength required for the grill support 18 and to reinforce the load on the hood skin 15 when the hood is attached. The reinforcing function can be provided.

  As shown in FIG. 10, in the vehicle body front structure, the weakened portion 68 is provided in the loop bracket 57 near the center in the vertical direction of the vehicle body. Therefore, in addition to the effect of the fourth aspect, The fragile portion 68 can be broken. As a result, load absorption is not adversely affected.

  As shown in FIGS. 7 and 8, in the vehicle body front structure, the grill support 18 is provided with the heat-resistant seal 51 attached along the lower end 18a, so that the heat of the radiator 25 can be shut off. In the vehicle body front structure according to the present invention, since the hood lock 27 is disposed below the normal position, the hood lock 27 is arranged along the lower end 18a of the grill support 18 so as not to be heated by the heat of the radiator 25 in consideration of opening and closing of the hood. The heat-resistant seal 51 is provided.

  As shown in FIGS. 1 and 11, in the vehicle body front structure, an engine hood 17 including a hood skin 15 that closes the engine room 13 and a hood frame 16 provided on the back surface of the hood skin 15, and below the engine hood 17. Lamps 21 and 21 provided on the left and right sides of the lamp.

  A hood seal 34 that absorbs an impact load on the hood frame 16; a seal attachment portion 37 that attaches the hood seal 34; and a seal pressing portion 38 that crushes the hood seal 34 when a load is input from above in front of the seal attachment portion 37. . The lamp body 21 is provided with a seal contact surface 71 at a position facing the seal pressing portion 38 with the engine hood 17 closed, and the hood seal lower end 34a is separated from the seal contact surface 71 with the engine hood 17 closed. .

  That is, the seal pressing portion 38 is formed on the hood frame 16, the seal contact surface 71 is formed on the upper surface of the lamp body 21, and these are arranged so as to be substantially parallel to sandwich the hollow portion (water droplet-shaped portion) 76. The input load from above when the engine hood 17 is strongly closed can be appropriately absorbed.

  Thereby, when the engine hood 17 is strongly closed, it is possible to prevent rainwater from entering the lamp body 21 caused by damaging the lamp body 21 whose tip is provided below the engine hood 17. Can be prevented from being deteriorated by being directly received, and noise and vibration due to the contact between the hood seal 34 and the lamp body 21 can be prevented.

  As shown in FIG. 11, in the vehicle body front structure, the hood seal 34 includes the hollow portion 76 formed in a hollow cylindrical shape, so that the hood seal 34 is easily sandwiched between the seal pressing portion 38 and the seal contact surface 71 and easily crushed. Further, prevention of rainwater intrusion, prevention of drying deterioration, and prevention of noise and vibration are more exhibited.

  As shown in FIG. 11, in the front structure of the vehicle body, the vicinity of the root 76a of the hollow portion 76 of the hood seal 34 abuts the seal pressing portion 38, so that it is sandwiched between the seal pressing portion 38 and the seal contact surface 71, and It becomes easy to crush, preventing rainwater intrusion, preventing drying deterioration, and preventing noise and vibration.

  As shown in FIGS. 2 and 11, the front structure of the vehicle body includes a hood frame 16 having a grill support 18 extending downward from the front lower surface and a front grill 19 provided on the front surface of the grill support 18. Since the hood seals 34 are positioned on the left and right sides of the grill support 18, the hood seals 34 can be set in positions, sizes, and ranges as required without providing the hood seals 34 on the entire front surface of the engine hood 17 a.

  As shown in FIG. 11, in the vehicle body front structure, the hood seal 34 is in contact with the lower surface of the hood frame 16 in front of the seal attachment portion 37, so that the upper portion of the hood seal 34 is fixed by the seal attachment portion 37. Since the front is always pressed upward along the lower surface of the hood frame 16, the desired seal performance can be exhibited without the hood seal 34 being displaced due to load input from above or vibration.

  As shown in FIG. 11, in the front structure of the vehicle body, the hood seal 34 has the hood seal lower end 34a located above the engine hood front end 17a in a side view with the engine hood 17 closed. Even if there is a gap S5 between the seal 34 and the upper surface of the lamp 21, the hood seal 34 becomes difficult to see from the front of the vehicle body with the engine hood 17 closed, and the appearance is improved.

  In the vehicle body front structure according to the present invention, as shown in FIG. 15, the hollow portion 76 formed in a hollow cylindrical shape is formed in the hood seal 34. The groove shape may be U-shaped, and may not be provided in the entire width direction of the hood seal 34.

  In the vehicle body front part structure according to the present invention, there are places described as “engine hood front end 17a” and “hood frame 16 front end” in the specification, but these positions are the same.

  The vehicle body front structure according to the present invention is suitable for use in passenger cars such as sedans and wagons, and is particularly suitable for use in light vehicles having a large front grille in terms of design.

  DESCRIPTION OF SYMBOLS 11 ... Vehicle body, 13 ... Engine room, 15 ... Hood skin, 16 ... Hood frame, 17 ... Engine hood, 17a ... Engine hood front end, 18 ... Grill support, 18a ... Bottom end of grill support, 19 ... Front grille, 21 ... Light Body, 24 ... Bulkhead, 26 ... Hood stopper, 27 ... Hood lock, 32 ... Striker, 33 ... Support reinforcement member, 34 ... Hood seal, 34a ... Lower end of the hood seal, 38 ... Seal pressing part, 44 ... Support joint part Opposing parts (joining facing part), 45a to 45e ... support joining part, 46a to 46d ... notch, 47 ... hood stopper contact surface, 51 ... heat-resistant seal, 56 ... loop, 57 ... loop bracket, 68 ... weak part, 71 ... Seal contact surface, 76 ... Hollow part, 76a ... Root.

According to a fourth aspect of the present invention, the grille support is provided with a striker that engages with a hood lock provided at an upper part of the bulkhead that supports the engine hood at the center of the vehicle width, and the striker includes a loop that engages with the hood lock, and a loop. The loop bracket is provided to straddle the lower surface of the hood frame and the grille support, and the loop is installed below the grille support.

In the invention according to claim 4, the grill support, Ru includes a striker for engaging the hood lock provided in the bulkhead upper supporting the engine hood in the vehicle width center.
The striker consists of a loop that engages the hood lock and a loop bracket that supports the loop, and the loop bracket is provided across the lower surface of the hood frame and the grill support, so that the loop is disposed below the grill support. can do. That is, by arranging the loop below the grill support, load absorption from above by the hood frame can be improved. By straddling the lower surface of the hood frame and the grill support, the strength required for the grill support can be secured, and a reinforcement function of a reinforcement that reinforces the load on the hood skin when the hood is attached can be provided.

4, as shown in FIGS. 6 and 10, in the vehicle body front structure, the grill support 18, Ru provided with a striker 32 that engages the hood lock 27 provided in the bulkhead 24 upper in the vehicle width center.

Claims (12)

An engine hood comprising a hood skin that closes the engine room and a hood frame provided on the back surface of the hood skin; a grill support that extends downward from the front lower surface of the hood frame; and a front grill provided on the front surface of the grill support; A vehicle body front structure comprising:
The grille support has a support joint portion that is welded and fixed to the hood frame and bent toward the rear of the vehicle body, and a hood stopper contact surface that abuts against a hood stopper that supports the engine hood on both sides.
The hood frame has a front body structure characterized in that a portion facing the support joint portion is located behind the front end of the hood frame, and a portion facing the support joint portion is inclined backward.   The vehicle body front structure according to claim 1, wherein the grille support has a notch between the plurality of support joints. The grill support includes a support reinforcing member provided above the hood stopper contact surface and straddling the lower surface of the hood frame and the grill support.
The vehicle body front part structure according to claim 1, wherein the support reinforcing member has a U-shaped cross-sectional view and an open upper and lower end. The grill support is provided with a striker that engages with a hood lock provided at the upper part of the bulkhead at a vehicle width center,
The striker includes a loop that engages with the hood lock, and a loop bracket that supports the loop.
4. The vehicle body front according to claim 1, wherein the loop bracket is provided across the lower surface of the hood frame and the grill support, and the loop is installed below the grill support. 5. Part structure.   The vehicle body front part structure according to claim 4, wherein the loop bracket is provided with a weak portion in the vicinity of the center of the vehicle body in the vertical direction.   6. The vehicle body front structure according to claim 1, wherein the grill support is provided with a heat-resistant seal attached along a lower end. A vehicle body front structure comprising a hood skin that closes an engine room and an engine hood comprising a hood frame provided on the back surface of the hood skin, and lamps provided on the left and right of the engine hood,
The hood frame includes a hood seal that absorbs an impact load, a seal attachment portion that attaches the hood seal, and a seal pressing portion that crushes the hood seal in front of the seal attachment portion when a load is input from above. ,
The lamp body includes a seal contact surface at a position facing the seal pressing portion with the engine hood closed.
A vehicle body front structure characterized in that the lower end of the hood seal is separated from the seal contact surface in a state where the engine hood is closed.   The vehicle body front structure according to claim 7, wherein the hood seal includes a hollow portion formed in a hollow cylindrical shape.   The vehicle body front part structure according to claim 8, wherein the hood seal has a vicinity of a base of the hollow portion in contact with the seal pressing portion. The hood frame includes a grill support extending downward from a front lower surface, and a front grill provided on the front surface of the grill support,
The vehicle body front structure according to claim 7, wherein the hood seal is located on the left and right sides of the grill support.   The vehicle body front structure according to claim 7, wherein the hood seal is in contact with the lower surface of the hood frame in front of the seal mounting portion.   The vehicle body front portion according to any one of claims 7 to 11, wherein the hood seal has a hood seal lower end positioned above a front end of the engine hood in a side view when the engine hood is closed. Construction.

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