JP2012153263A - Front body of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a front body of a vehicle, shortening a length in the front and rear direction of the front body of the vehicle (crushable zone) without impairing shock absorption.SOLUTION: In the front body of the vehicle 12, a skid plate 68 overhanging to the front part of the vehicle 11 is provided at a lower cross beam (front bulk head lower cross member) 66 to be the lower part of a front frame section (bulk head) 37 provided to the end part of a front side frame 16 and extended to right and left sides, a lower buffer bar member 137 extended to the rear side of the vehicle 11 is provided to the lower cross beam 66 and a shock absorption projecting member 138 integrally forming a closed cross section together with the rear part of the skid plate 68 is disposed in front of the lower buffer bar member 137.

Description

  The present invention relates to a vehicle body front portion in which a member for absorbing an impact input to the front is provided inside the front of the vehicle.

Some vehicle body front portions are provided with an impact absorbing member inside the front of the vehicle.
These members are arranged below the left and right front side frames along the front wheels, respectively, projecting side struts from left and right vertical arms extending in the front-rear direction, and attaching left and right extending bars to the ends of these side struts. Further, a center column is provided in the center of the bar in parallel with the side column and is supported by the vertical arm (for example, see Patent Document 1).

However, in the prior art (Patent Document 1), since the impact input to the front is transmitted in a straight line from the left and right side columns to the left and right vertical arms extending in the longitudinal direction of the vehicle, the left and right vertical arms have high buckling strength and are deformed. Difficult to absorb shocks.
Further, if the impact input to the front of the vehicle cannot be sufficiently absorbed, it is necessary to lengthen the front and rear lengths (crushable zone) of the front portion of the vehicle body.

Japanese Patent No. 4521403

  An object of the present invention is to provide a vehicle body front portion in which the length in the front-rear direction of the vehicle body front portion (crushable zone) is shortened without impairing shock absorption.

  In order to solve the above-mentioned problem, the invention according to claim 1 includes left and right front side frames extending forward from a passenger compartment provided in the vehicle, and a front frame provided at the front end of the front side frame. In the front part of the vehicle body, a foot crossing plate projecting forward of the vehicle is provided on the lower cross beam extending left and right that forms the lower part of the front frame, and a lower buffer bar member extending rearward of the vehicle is provided on the lower cross beam. An impact-absorbing projecting member having a closed cross-sectional shape integrally formed with the rear portion of the foot wiper plate is provided in front.

  The invention according to claim 2 is characterized in that the impact-absorbing protruding member is disposed above the lower buffer bar member.

  The invention according to claim 3 is characterized in that the impact-absorbing protruding member has a triangular shape in a side view of the vehicle, is sharpened toward the tip, and the inclined absorption frame portion is inclined.

  The invention according to claim 4 is characterized in that the foot wiper plate includes a bead extending in the front-rear direction of the vehicle along the impact-absorbing protruding member.

  The invention according to claim 5 is characterized in that the rear portion of the lower buffer bar member is coupled to a sub-frame disposed in front of the floor of the passenger compartment and attached to the front side frame.

  In the invention according to claim 1, the foot crossing plate which protrudes to the front of the vehicle is provided on the lower cross beam which extends to the left and right which forms the lower part of the front frame provided at the front ends of the left and right front side frames, and the lower cross beam extends to the rear of the vehicle Since the lower shock absorbing bar member is provided, and the shock absorbing protruding member formed integrally with the rear portion of the foot wiper plate is formed in front of the lower shock absorber bar member, the leg portion of the pedestrian is supported by the foot wiper plate. It can protect and can absorb the impact when it comes into contact (impact) with an obstacle such as another vehicle by the impact absorbing projection member. As a result, the amount of deformation (shock absorption allowance (crushable zone)) of the front part of the vehicle body for absorbing shock can be reduced, and the length of the front part of the vehicle body (crushable zone) in the front-rear direction can be shortened. Can do.

In the invention according to claim 2, since the shock absorbing projection member is arranged higher than the lower shock absorbing bar member, when an impact (load) is input to the front of the vehicle, the upper shock absorbing protruding member is moved to the lower shock absorbing bar member. The eccentric load is transmitted to the member, and the lower buffer bar member starts to bend.
Thus, the lower buffer bar member can absorb the impact by easily bending and deforming the upper surface of the lower buffer bar member.

In the invention according to claim 3, the shock absorbing projecting member has a triangular shape in a side view of the vehicle, is pointed toward the tip, and the inclined absorption frame portion is inclined, so that an impact (load) is input to the front of the vehicle. Then, the impact absorbing protruding member can be compressed and deformed so as to be compressed from the tip to absorb the impact.
Further, the shock absorbing protruding member can be compressed in the longitudinal direction of the vehicle as desired without being folded at the center thereof, and the shock can be absorbed more reliably.

  In the invention according to claim 4, since the foot removal plate includes a bead extending in the front-rear direction of the vehicle along the impact absorbing projecting member, the foot removal plate against an impact (load) input to the front of the vehicle. This increases the strength (reaction force) and increases the amount of shock absorption.

  In the invention according to claim 5, since the rear portion of the lower buffer bar member is coupled to the subframe disposed in front of the floor of the passenger compartment and attached to the front side frame, the rear buffer bar member is moved from the rear portion to the subframe. Impact (load) can be dispersed and absorbed.

It is sectional drawing which shows the outline | summary of the vehicle which concerns on the Example of this invention. It is a perspective view of the vehicle body front part seen from the lower right. It is a disassembled perspective view of a vehicle body front part. It is a bottom view of the left part of the vehicle body front part seen from the bottom. It is a perspective view of a subframe concerning an example, and a side beam. It is a perspective view of a front frame part, a subframe, and a side beam concerning an example. It is a perspective view which shows the state which removed the side beam which concerns on an Example. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 6. FIG. 9 is a view taken in the direction of arrow 9 in FIG. 6. Fig. 10 is a cross section taken along line 10-10 in Fig. 6. It is a perspective view of the side beam attached to a front frame part. FIG. 12 is a sectional view taken along line 12-12 of FIG. FIG. 13 is a cross-sectional view taken along line 13-13 in FIG. 7. It is a figure which shows a foot-wiping plate, (a) is a perspective view, (b) is the bb sectional view taken on the line of (a). It is a side view of the impact-absorbing protrusion member which concerns on an Example, and a lower buffer bar member. It is a front view of an impact absorption protrusion member and a lower buffer bar member. It is detail drawing of an impact-absorbing protrusion member, (a) is a side view, (b) is a perspective view. It is a figure explaining the mechanism which absorbs the impact of the foot-wiping plate of a vehicle body front part. It is a figure explaining the mechanism which absorbs the shock of a vehicle body front part.

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

As shown in FIGS. 1 to 3, the vehicle 11 employs a vehicle body front portion 12 according to the embodiment.
The vehicle body front portion 12 is a front body of the vehicle body 14 and includes a subframe 15. The engine 18 is mounted on the subframe 15 and the left and right front side frames 16 and 17 to support the front suspension device 21.

Here, the longitudinal direction of the vehicle 11 is defined as the X-axis direction, the lateral direction (vehicle width direction) of the vehicle 11 is defined as the Y-axis direction, and the vertical direction of the vehicle 11 is defined as the Z-axis direction.
The left and right are based on the driver, and the right side of the driver is the right when sitting in the driver's seat and looking in front.

As shown in FIGS. 1, 5, and 6, the engine 18 includes an existing engine body 23 arranged on the right side and a transmission device connected to the engine body 23 and arranged on the left side when installed in the horizontal direction (Y-axis direction). 24.
As shown in FIGS. 5, 6, and 9, the front suspension device 21 is a McPherson strut type lower arm 27 that supports the front wheel 26 (FIG. 1), and a damper (strut) that has a lower end attached to the lower arm 27 and is erected. 28.

The lower arm 27 is an existing one and is a cast product (solid) using iron (steel) or an aluminum alloy, and has a higher strength than the subframe 15 using a steel plate.
The lower arm front connection end 31 connected to the subframe 15, the lower arm rear connection end 32, and the tip link portion 33 connecting the lower end of the damper 28 that supports the front wheel 26 are provided. The upper end of the damper 28 is fastened to the damper housing 34 (FIG. 2) of the vehicle body front portion 12.

  The vehicle body front portion (front body) 12 is erected on the left and right front side frames 16 and 17, a front frame portion (bulkhead) 37 attached to the front ends of the front side frames 16 and 17, and the front side frames 16 and 17. A damper housing 34.

As shown in FIGS. 1 to 4, the front side frames 16 and 17 include a substantially horizontal frame body 38 and a front floor frame 41 that is inclined downwardly downward (in the direction of arrow a <b> 1) from the frame body 38 and inclined. .
The sub-frame 15 is fastened from below to a front frame fastening portion 43 provided at the center of the front floor frame 41 and a rear frame fastening portion 44 provided at the rear, and the front floor frame 41 is integrally joined to a floor (underbody) 45. ing.

As shown in FIG. 2, the underbody 45 has the left and right ends of the front floor panel 46 joined to the side sills 51 of the left and right side bodies 47 and 48.
Moreover, the front floor panel 46, the tunnel part 52 provided in the center of the right and left of the front floor panel 46, the floor center frame 54, the floor frame 55, the outrigger 56 extended from the front floor frame 41 shown in FIGS. Is provided.
The rear ends of these floor frames 55 and the outer ends of the outriggers 56 are joined to the side sills 51 behind the left and right front side frames 16 and 17.

The front side frames 16 and 17 also have a front shock absorber 58 as a front portion of the frame body 38, and a bumper beam 62 of a bumper device 61 is attached to the front shock absorber 58.
The front shock absorber 58 directly absorbs shock (load) input to the bumper beam 62.

  The bumper beam 62 is directly fastened to the front end of the front shock absorber 58. In other words, an object that absorbs an impact (load) input to the bumper beam 62 is not interposed between the front side frames 16 and 17.

A front frame portion (bulk head) 37 is attached inside the front impact absorbing portion 58.
The front frame portion (bulk head) 37 includes a front side bulk head 64 erected on the left and right front side frames 16, 17, a bulk head upper frame 65 joined to the top of the front side bulk head 64, and a front side bulk head 64. A front bulkhead lower cross member 66 joined to the lower portion is provided. Reference numeral 68 denotes a foot wiper plate joined to the front bulkhead lower cross member 66.

Next, the main structure of the vehicle body front part 12 will be described with reference to FIGS.
The vehicle body front portion 12 includes left and right front side frames 16 and 17 extending forward from a passenger compartment 71 provided in the vehicle 11, a front frame portion (bulk head) 37 provided at the front ends of the front side frames 16 and 17, Is provided.

  A side beam 74 extending from the sub frame 15 to the front frame portion (bulk head) 37 of the vehicle body front portion 12 is provided.

  A foot crossing plate 68 projecting forward of the vehicle 11 is provided on a lower cross beam (front bulkhead lower cross member) 66 extending left and right, which forms the lower part of the front frame portion (bulk head) 37, and a lower cross beam (front bulkhead). A lower buffer bar member 137 extending rearward of the vehicle 11 is provided on the lower cross member 66, and an impact absorbing protruding member 138 integrally formed with a rear section of the foot wiper plate 68 is formed in front of the lower buffer bar member 137. Provided.

The shock absorbing protruding member 138 is disposed above the lower buffer bar member 137 (distance β in FIG. 15).
Specifically, the lower portion 142 of the shock absorbing projection member 138 is provided at a position higher than the central horizontal portion 135 of the lower buffer bar member 137 by a distance β.

The shock absorbing projection member 138 has a triangular shape as viewed from the side of the vehicle (the viewpoint in FIG. 15), is sharpened toward the tip 143, and the inclined absorption frame portion 144 is inclined.
The inclined absorption frame portion 144 is a portion whose surface is directed downward of the vehicle 11 and is included in the absorption main body 138c.

As shown in FIG. 14, the foot wiper plate 68 includes a bead 146 that extends in the front-rear direction of the vehicle 11 along the impact absorbing protruding member 138.
“Along the shock absorbing protruding member 138” means being close to the shock absorbing protruding member 138 and parallel to the shock absorbing protruding member 138. Further, it is parallel to the shock absorbing protruding member 138 regardless of the distance from the shock absorbing protruding member 138.

  As shown in FIGS. 1 and 2, the rear portion 141 of the lower buffer bar member 137 is connected to the subframe 15 disposed in front of the floor (underbody) 45 of the passenger compartment 71 and attached to the front side frames 16 and 17. .

Next, the vehicle body front portion 12 will be described in detail.
The vehicle body front portion 12 includes the already-described lower buffer bar member 137, the bending impact absorbing member 81, the impact absorbing projecting member 138, and the foot wiper plate 68.

  As shown in FIGS. 7 and 11, the lower buffer bar member 137 has a central horizontal portion 135 of a rectangular tubular body (FIG. 13) formed in a straight line, and a front portion 196 is disposed higher than the rear portion 141 by a distance Hf. ing. The central horizontal portion 135 is disposed below the rear portion 141 by a distance Hr. Note that the inclined portion 136 includes a front portion 196.

Moreover, it has the fastening bracket 152 which fastens the rear part 141 as shown in FIGS. The fastening bracket 152 has a U-shaped cross section and is joined to the front wall 75 by welding (welded portion 154) with the opening facing downward.
The rear portion 141 is formed with a fastening force transmitting portion 156 that transmits a fastening force (axial force) through the bolt 155.

  As shown in FIGS. 9 and 10, the inclined portion 136 and the central horizontal portion 135 in the vicinity of the inclined portion 136 are fitted into the bending impact absorbing member 81 and joined by welding.

  The bending impact absorbing member 81 is obtained by plastic processing of a steel plate. As shown in FIGS. 7, 9, and 10 to 12, a flange portion 197 is formed in an absorbing frame portion 91 having a U-shaped cross section, and an opening is formed in a vehicle. 11 is arranged downward.

  A bead 81 b is formed at the peak portion 81 a of the bending impact absorbing member 81. The bending shock absorbing member 81 is brought into contact with the top portion 137a of the lower buffer bar member 137 at the portion where the lower buffer bar member 137 is fitted. As a result, the strength of the flexural shock absorbing member 81 can be set.

The absorption front portion 198 (the remaining portion where the lower buffer bar member 137 is not fitted) of the bending shock absorbing member 81 is connected to the front bulkhead lower cross member 66 of the front frame portion (bulk head) 37 and the front bulkhead lower cross member 66. The nut plate 201 is fastened by screwing a bolt 202.
The shock absorbing protrusion member 138 is provided in front of the bending shock absorbing member 81 as described above.

A shock absorbing projection member 138 is provided in front of the bending shock absorbing member 81 so as to extend the bending shock absorbing member 81 (FIG. 9).
“To extend the bending shock absorbing member 81” means that the axis 81a of the bending shock absorbing member 81 and the axis 138a of the shock absorbing protruding member 138 coincide with each other in a plan view of the vehicle (viewed from the back of FIG. 9). Yes. Also, the vehicle side view (viewpoint in FIG. 10), the height of the upper surface 82 of the bending shock absorbing member 81 in the vehicle vertical direction (Z-axis direction) and the height of the lower end 138b of the shock-absorbing protrusion member 138 (Z-axis direction) coincide. I am letting.

  As shown in FIGS. 15 to 17, the impact-absorbing protrusion member 138 is obtained by plastic processing of a steel plate, and is formed in a triangular shape in a vehicle side view (view point in FIG. 15) and tapered forward.

Further, the shock absorbing projecting member 138 is formed with an upper flange 205 and a base flange 206 that are connected to the absorbing main body 138c. The base flange 206 was overlapped and joined to the front wall portion 66 a of the front bulkhead lower cross member 66.
The upper flange 205 is overlapped and joined to the foot wiper plate 68 to form a closed cross-sectional shape with the foot wiper plate 68 (FIG. 10).

  As shown in FIG. 14, the foot wiper plate 68 is obtained by plastic working a steel plate, and has a root end 208 joined to the front bulkhead lower cross member 66 of the front frame (bulkhead) 37, and a root end 208. A continuous impact deformation portion 211, a front end portion 212 continuous to the impact deformation portion 211, an opening 213 opened in the impact deformation portion 211, and a bead 146 provided between the openings 213 are provided.

The bead 146 is a portion formed in a groove shape. The bead 146 extends from the root end 208 to the front end 212 at the front and rear of the vehicle 11 with the opening 146a downward, and is formed with a height h and a width w. By forming the bead 146, the strength of the foot removal plate 68 is secured.
As a result, it is possible to suppress the bending of the front end portion 212 of the foot wiper plate 68 and to set the magnitude of the impact (load) to be absorbed.

Next, the operation of the vehicle body front portion 12 according to the embodiment will be described.
A mechanism for absorbing the impact of the vehicle body front portion 12 will be described (see FIGS. 18 and 19).
In the vehicle body front portion 12, when an obstacle (for example, a human S) comes into contact with the front surface 79 (FIG. 1) of the vehicle 11, the foot wiper plate 68 is deformed as indicated by an arrow e1, and the bending shock absorbing member 81 is further deformed. Therefore, the amount of shock absorption can be increased as compared with the foot wiper plate 68 alone. As a result, the deformation amount (shock absorption allowance) of the vehicle body front part 12 for absorbing the impact can be reduced, and the length of the vehicle body front part 12 in the front-rear direction can be shortened.

  That is, the foot wiper plate 68 can absorb a light collision (impact (load) is small) due to contact with the human S and can protect the legs of the pedestrian.

Further, as shown in FIG. 19, in the vehicle body front portion 12, when an obstacle such as another automobile Sa contacts the front surface 79 (FIG. 1) of the vehicle 11, the bumper beam 62, the foot wiper plate 68, and the shock absorbing protruding member 138 are deformed. To absorb the shock.
Furthermore, since the front impact absorbing portion 58 of the frame body 38 of the front side frames 16 and 17 is compressed and deformed, the impact can be absorbed.

  On the other hand, the bending shock absorbing member 81 and the lower shock absorbing bar member 137 are bent in synchronization with the compression deformation of the front shock absorbing portion 58 of the front side frames 16 and 17, so that the shock can be absorbed.

  Further, in the vehicle body front portion 12, it is possible to disperse and absorb an impact (load) from the rear portion 141 of the lower buffer bar member 137 to the subframe 15.

  As described above, in the vehicle body front portion 12, when the leg portion of the pedestrian is protected by the foot-wiping plate 68 and the obstacle absorbing member 138 comes into contact (impacts) with an obstacle such as another automobile Sa (FIG. 19). Can absorb the shock.

  The vehicle body front portion of the vehicle of the present invention is suitable for an automobile.

  DESCRIPTION OF SYMBOLS 11 ... Vehicle, 12 ... Vehicle body front part, 15 ... Sub-frame, 16 ... Left front side frame, 17 ... Right front side frame, 37 ... Front frame part (bulkhead), 45 ... Floor (underbody), 66 ... Lower cross beam (front bulkhead lower cross member), 68 ... foot wiper plate, 71 ... vehicle compartment, 137 ... lower shock absorbing bar member, 138 ... shock absorbing protruding member, 141 ... rear part of lower shock absorbing bar member, 143 ... shock absorbing Tip of protruding member, 144... Inclined absorption frame portion, 146.

Claims (5)

In the front part of the vehicle body, comprising left and right front side frames extending forward from a passenger compartment provided in the vehicle, and a front frame provided at the front end of the front side frame,
The lower cross beam that extends to the left and right that forms the lower part of the front frame portion is provided with a foot wiper plate that protrudes forward of the vehicle, the lower cross beam is provided with a lower buffer bar member that extends rearward of the vehicle, A front part of a vehicle body of a vehicle, characterized in that an impact-absorbing projecting member that integrally forms a closed cross-sectional shape with the rear part of the foot wiper plate is provided in front.   The vehicle body front portion of the vehicle according to claim 1, wherein the shock absorbing protruding member is disposed above the lower buffer bar member.   The vehicle body front part of the vehicle according to claim 1, wherein the shock absorbing projecting member has a triangular shape in a side view of the vehicle, is pointed toward the tip, and an inclined absorption frame part is inclined.   The vehicle body front portion according to any one of claims 1 to 3, wherein the foot wiper plate includes a bead extending in the front-rear direction of the vehicle along the shock absorbing protruding member. .   The rear part of the said lower buffer bar member is couple | bonded with the sub-frame which was arrange | positioned ahead of the floor of the said compartment, and was attached to the said front side frame. The front of the vehicle body.

Images