JP5329577B2 - Vehicle body front - Google Patents

Description

  The present invention relates to a vehicle body front portion in which a shock absorbing beam is extended from a subframe provided in front of a floor of a passenger compartment to the vicinity of the front of the vehicle.

Some vehicle body front portions are provided with a first shock absorbing portion on the front of the vehicle and a second shock absorbing portion below the first shock absorbing portion.
The vehicle body front portion includes a first shock absorbing portion provided at the front end of the front side frame along the front wheel, and a second shock absorbing portion provided at the front end of the apron lower member (beam) disposed below the front side frame. The impact from the front can be absorbed (for example, refer patent document 1).

However, in the prior art (Patent Document 1), the amount of shock absorption of the apron lower member (beam) disposed below the front side frame may be small.
In other words, since the impact (load) input to the apron lower member is transmitted in a straight line from the apron lower member to the suspension frame (subframe) connecting the apron lower member root, the apron lower member has high buckling strength. The apron lower member cannot absorb the impact sufficiently.
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.

JP 2009-51440 A

  The present invention absorbs an impact (load) input to the front of the vehicle, shortens the front and rear lengths (crushable zone) of the vehicle body, forms a space, and creates an engine accessory (for example, a compressor). It is an object of the present invention to provide a front part of a vehicle body arranged.

In order to solve the above-mentioned problem, the invention according to claim 1 attaches a subframe that is disposed in front of the floor of the passenger compartment and extends to the left and right to the left and right front side frames of the front part of the vehicle body that is continuous with the passenger compartment of the vehicle. The front part of the vehicle body has a side beam extending from the subframe to the front frame part of the front part of the vehicle body, and the side beam is joined to the front wall of the subframe facing the front of the vehicle and has a central horizontal part extending forward. A lower buffer bar member formed with an inclined part extending obliquely upward connected to the central horizontal part, and joined to the front frame part extending obliquely upward from the inclined part , and is strong against an impact input to the front of the vehicle e Bei and lower buffer bar member is smaller than the bending shock absorbing member, an inclined portion, the inclined portion of the vicinity of within the central horizontal portion is and bonded fits within the bending impact absorbing member, among the bending impact absorbing member Of the lower buffer Front not fit the over member may be in the higher than the boundary portion that overlaps the inclined portion of the lower buffer bar member.

  The invention according to claim 2 is characterized in that the upper surface of the bending shock absorbing member is brought into contact with and bonded to the lower surface of the front frame portion.

  The invention according to claim 3 is characterized in that an impact absorbing projection member is provided in front of the bending impact absorbing member so as to extend the bending impact absorbing member.

  According to a fourth aspect of the present invention, the sub-frame has a front wall facing the front of the vehicle, a front arm connecting portion that is connected to the front wall and supports the lower arm of the suspension device at the left and right ends, and a lower buffer bar. The rear part of the member is connected to the front wall provided with the front arm connecting part.

  The invention according to claim 5 is characterized in that the foot wiper plate is extended from the front frame portion to the front of the vehicle, and the shock absorbing projection member is integrally joined to the foot wiper plate.

In the invention according to claim 1, the side beam is joined to the front wall of the subframe facing forward of the vehicle to form a central horizontal portion extending forward, and an inclined portion extending obliquely upward connected to the central horizontal portion is formed. A lower shock-absorbing member that extends obliquely upward from the inclined portion and is joined to the front frame portion, and has a lower strength than the lower shock-absorbing member with respect to an impact input to the front of the vehicle. Therefore, when an impact (load) is input to the front of the vehicle, the bending impact absorbing member having a low strength is bent and deformed by troughing the upper surface thereof, so that the amount of deformation of the vehicle (shock absorption allowance (crushable zone It is possible to absorb a relatively small impact while shortening the length (stroke).

  In addition, after the bending shock absorbing member is bent and deformed, the upper front frame is retracted to transmit the load to the bending shock absorbing member, so that the lower buffer bar member is bent by bending downward into a V shape. Can absorb shocks.

Furthermore, an engine accessory (for example, a compressor) can be disposed in a space provided above the bending impact absorbing member.
That is, since the bending shock absorbing member extends obliquely downward from the front frame portion, the space above the bending shock absorbing member should be made larger than that obtained by extending the bending shock absorbing member horizontally from the front frame portion. Can do.

  In the invention according to claim 2, since the upper surface of the flexural shock absorbing member is brought into contact with and coupled to the lower surface of the front frame portion, the flexural impact absorbing member is deformed, and then the flexural impact is absorbed from the upper front frame portion. The impact (load) can be transmitted to the upper surface of the lower lower buffer bar member via the upper surface of the absorbing member so as to be compressed. As a result, the upper surface of the bending impact absorbing member can be easily folded and deformed by valley folding.

  In the invention according to claim 3, since the impact absorbing protrusion member is provided in front of the bending impact absorbing member so as to extend the bending impact absorbing member, when an impact (load) is input to the front of the vehicle, it is close to the front. When the impact absorbing protruding member is compressed and deformed, the impact (load) starts to be absorbed. As a result, a smaller impact can be absorbed, and as a result, impact absorption can be enhanced.

  In the invention according to claim 4, the sub-frame has a front wall facing the front of the vehicle, a front arm connecting portion that is connected to the front wall and supports the lower arm of the suspension device at the left and right ends, and a lower buffer bar Since the rear part of the member is connected to the front wall provided with the front arm connecting part, when an impact (load) is transmitted from the front of the vehicle to the lower buffer bar member, the lower arm in the vicinity through the front wall from the lower buffer bar member It is transmitted to. The impact (load) can be distributed from the lower arm to the vehicle body.

According to the fifth aspect of the present invention, the foot wiper plate is extended from the front frame portion to the front of the vehicle, and the shock absorbing protruding member is integrally joined to the foot wiper plate. It can be reinforced with, and the effect of paying the foot can be enhanced.
Moreover, installation of the foot-wiping plate is facilitated.

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 figure explaining the mechanism which absorbs the impact of a vehicle body front, (a) is a side view before inputting an impact, (b) is a figure showing the continuation of (a), (c) is a continuation of (b). (D) is a figure which shows the continuation of (c).

  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
And an engine accessory (for example, a compressor) 18a disposed above the right side beam 74.

  As shown in FIGS. 5, 6, and 9, the front suspension device 21 is a McPherson strut type, a 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 part 12 is a subframe 15 that extends from side to side and is arranged in front of the floor (underbody) 45 of the vehicle room 71 on the left and right front side frames 16 and 17 of the vehicle body front part 12 that is continuous with the vehicle room 71 of the vehicle 11. Installed.
And it has the side beam 74 extended from the sub-frame 15 to the front frame part (bulk head) 37 of the vehicle body front part 12. FIG.

  The side beam 74 is joined to the front wall 75 of the sub-frame 15 facing the front of the vehicle 11 to form a central horizontal portion 135 extending forward, and an inclined portion 136 that extends to the central horizontal portion 135 and extends obliquely upward is formed. A lower shock absorbing bar member 137, a bending shock absorbing member 81 joined to the inclined portion 136 and the front frame (bulk head) 37, and having a lower strength than the lower shock absorbing bar member 137 with respect to an impact input to the front face 79 of the vehicle 11; It is equipped with.

  The upper surface 82 of the bending shock absorbing member 81 is brought into contact with and bonded to the lower surface 83 (FIGS. 9 and 10) of the front frame portion (bulk head) 37.

  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).

The subframe 15 has a front wall 75 facing forward of the vehicle 11 and a front arm connecting portion 85 that is connected to the front wall 75 and supports the lower arm 27 of the suspension device (front suspension device) 21 at left and right ends.
And the rear part 141 of the lower buffer bar member 137 is couple | bonded with the front wall 75 which provided the front arm connection part 85 (FIG. 8).

A foot wiper plate 68 extends from the front frame portion (bulk head) 37 to the front of the vehicle 11.
The shock absorbing projection member 138 is integrally joined to the foot wiper plate 68.

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. 9 to 11, the impact-absorbing protruding member 138 is obtained by plastic processing of a steel plate, and is formed in a triangular shape in a vehicle side view (viewpoint in FIG. 10) 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 FIG. 15).
In the vehicle body front portion 12, when an obstacle such as another automobile comes into contact with the front surface 79 (FIG. 1) of the vehicle 11, in order from the front, the foot wiper plate 68, the shock absorbing protrusion member 138, the bending shock absorbing member 81, the lower buffer bar. By deforming the member 137, it is possible to absorb an impact (load) while shortening the length of the deformation amount of the vehicle 11.
In other words, the impact (load) can be absorbed while the stroke of the crushable zone of the vehicle 11 is shortened.

Specifically, when an obstacle comes into contact with the vehicle body front portion 12 shown in FIG. 15 (a) and an impact (load) is input on the front side as shown by an arrow d1, the foot is moved as shown in FIG. 15 (b). The payment plate 68 is deformed.
At substantially the same time, the shock absorbing projection member 138 is also compressed and deformed.

The foot wiper plate 68 and the impact absorbing projection member 138 begin to deform before the bent impact absorbing member 81 in order to transmit an impact (load) to the front frame portion (bulk head) 37 and the front side frames 16 and 17.
As a result, it is possible to absorb a relatively small impact while shortening the length (stroke) of the deformation amount (shock absorption allowance (crushable zone)) of the vehicle 11.

  Subsequently, as shown in FIG. 15 (c), the upper surface from the boundary portion (the portion where the thickness of the plate changes due to the overlapping) 81c (see FIG. 10) where the bending shock absorbing member 81 overlaps the lower buffer bar member 137 Bend like a fold.

Since the front part of the input bending shock absorbing member 81 is higher than the boundary part and is eccentric, it bends so that the upper surface is valley-folded.
In addition, since the thickness of the boundary portion is changed by overlapping the lower buffer bar member 137, the load is concentrated and becomes a starting point of folding.

  Finally, as shown in FIG. 15 (d), the lower buffer bar member 137 is deformed. The upper surface is bent and folded so as to be valley-folded from or near the boundary between the central horizontal portion 135 and the rear portion 141 that are eccentric downward.

  Thus, in the vehicle body front portion 12, the foot wiper plate 68, the impact absorbing projection member 138, the bending impact absorbing member 81, and the lower buffer bar member 137 are deformed in order from the front, so that the impact (load) can be absorbed. it can.

  Further, an engine accessory (for example, a compressor) 18a (see FIG. 1) can be disposed in a space provided above the flexural shock absorbing member 81.

  Further, when an impact (load) is transmitted from the front surface 79 of the vehicle 11 to the lower buffer bar member 137, it is transmitted from the lower buffer bar member 137 to the nearby lower arm 27 through the front wall 75. The impact (load) can be distributed from the lower arm 27 to the vehicle body 14 via the rear fastening portion 98 and the rear frame fastening portion 44 of the subframe 15 (FIG. 4).

  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, 21 ... Suspension device (front suspension device), 27 ... Lower arm, 37 ... Front frame part (Bulk head), 45 ... floor (underbody), 68 ... foot wiper plate, 71 ... vehicle compartment, 74 ... side beam, 75 ... front wall of subframe, 79 ... front of vehicle, 81 ... flexural shock absorbing member, 82 ... upper surface of the flexural shock absorbing member, 83 ... lower surface of the front frame part (bulk head), 85 ... front arm connecting part of the subframe, 135 ... central horizontal part, 136 ... inclined part, 137 ... lower buffer bar member, 138 ... Shock absorbing projecting member, 141... Rear part of lower buffer bar member.

Claims (5)

In the front part of the vehicle body attached to the left and right front side frames of the front part of the vehicle body connected to the vehicle compartment, in front of the floor of the vehicle compartment and extending to the left and right,
A side beam extending from the sub-frame to the front frame of the front of the vehicle body;
The side beam is joined to the front wall of the sub-frame facing forward of the vehicle to form a central horizontal portion extending forward, and a lower buffer bar having an inclined portion extending obliquely upward connected to the central horizontal portion. and member, wherein the inclined portion extends obliquely upward and joined to the front frame portion, e Bei a said lower buffer bar member is smaller than the bending impact absorbing member strength to impact inputted to the front of the vehicle,
The inclined portion and the portion in the vicinity of the inclined portion in the central horizontal portion are fitted and joined in the bending shock absorbing member,
The front part of the vehicle body of the vehicle characterized in that a front part of the bending shock absorbing member not fitted with the lower buffer bar member is higher than a boundary part overlapping the inclined part of the lower buffer bar member .   The vehicle body front portion according to claim 1, wherein an upper surface of the bending shock absorbing member is brought into contact with and coupled to a lower surface of the front frame portion.   The vehicle body front portion of the vehicle according to claim 1 or 2, wherein an impact absorbing protrusion member is provided in front of the bending impact absorbing member so as to extend the bending impact absorbing member. The sub-frame has a front wall facing the front of the vehicle, and a front arm connecting portion that is connected to the front wall and supports a lower arm of a suspension device at left and right ends.
The vehicle body front portion according to any one of claims 1 to 3, wherein a rear portion of the lower buffer bar member is coupled to the front wall of the front arm coupling portion. Extend the foot plate from the front frame to the front of the vehicle,
The vehicle body front portion of the vehicle according to claim 3 or 4, wherein the shock absorbing protruding member is integrally joined to the foot wiper plate.

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