JP2021011164A - undercover - Google Patents

Abstract

To provide an undercover that does not disturb movement of an on-vehicle component retractable downward for preventing a fuel tank from being damaged at the time of a side collision.SOLUTION: An undercover 1 is attached to a bottom portion of a vehicle. Out of attachment points of a cover body 10 to a vehicle body, with respect to an input side attachment point P1 to a vehicle body frame (side sill 8) intersect with an input direction D1 of an impact load, a portion of the cover body 10, which is separated toward an inner side as a distal end side in the input direction, is set on the low level. Further, a bead portion 11 extending along a vehicle body frame and protruded downward in cross-section is formed at the cover body 10.SELECTED DRAWING: Figure 1

Description

The present invention relates to an undercover attached to the bottom of a vehicle.

The undercover attached to the bottom of the vehicle is fixed to a plurality of vehicle body frames such as a side member, a center member, and a cross member (see, for example, Patent Document 1). The undercover of Patent Document 1 is provided with a bead portion, and suppresses the occurrence of cracks in the undercover at the time of collision. Further, the undercover is provided with an embossed portion, so that the strength and rigidity of the undercover are enhanced. The outer peripheral edge of the undercover is fixed to the bottom surface of each vehicle body frame.

Jikkai Sho 63-148584

By the way, in a vehicle in which the fuel tank is located under the floor of the driver's seat near the center in the vehicle width direction, in-vehicle parts such as a canister are provided on the side of the fuel tank, and when a side collision occurs, the in-vehicle parts are lowered. It is required to prevent damage to the fuel tank by letting it escape. However, since the undercover of Patent Document 1 has the same mounting height with the vehicle body frame, the undercover may be bent upward when the undercover is pushed and deformed when a side collision occurs. Then, the in-vehicle parts could not escape downward and collided with the fuel tank, which could deform the fuel tank.

From such a viewpoint, it is an object of the present invention to provide an undercover that does not hinder the movement of in-vehicle parts that move downward in order to prevent damage to the fuel tank at the time of a side collision.

The present invention for achieving the above object is an undercover attached to the bottom of a vehicle. Among the attachment points of the cover body to the vehicle body, such an undercover is the cover body that is separated from the inside of the attachment points on the input side to the vehicle body frame that intersects the input direction of the collision load, which is the tip side in the input direction. The site is set low. Further, the cover body is characterized in that a bead portion extending downward along the vehicle body frame and having a convex cross section is formed.

According to the undercover of the present invention, when the vehicle body frame is deformed in the input direction (inside) due to the input of the collision load, the in-vehicle parts inside the vehicle body frame are pushed downward by the deformed floor panel pushed by the vehicle body frame. .. At this time, the input side attachment point of the cover body is pushed inward by the vehicle body frame, but the part of the cover body separated from the inside is lower than the input side attachment point, so that the cover body is deformed so as to bulge downward. Further, since the bead portion having a convex cross section extends downward along the vehicle body frame, the downward deformation of the cover body is promoted. Therefore, the undercover does not impede the movement of the in-vehicle parts moving downward to prevent damage to the fuel tank during a side collision.

According to the present invention, the undercover does not hinder the movement of the in-vehicle parts that move downward at the time of a side collision, so that damage to the fuel tank can be prevented.

It is a bottom view which showed the installation state of the undercover which concerns on embodiment of this invention. It is a bottom view which showed the bottom part of the vehicle which attaches an undercover. It is sectional drawing which showed the installation state of the undercover which concerns on embodiment of this invention. It is sectional drawing which showed the installation state of the undercover which concerns on embodiment of this invention. It is sectional drawing which showed the undercover, a cross member, and a floor panel. It is a schematic diagram which showed the undercover, the vehicle-mounted parts, the side sill, and the floor panel. It is sectional drawing which showed the undercover which concerns on the modification.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate. The same components are designated by the same reference numerals, and duplicate description will be omitted. When explaining the direction, the explanation will be based on the front, back, left, right, up and down as seen from the driver.

As shown in FIG. 2, in the vehicle of the present embodiment, the fuel tank 3 is provided at the center of the lower front portion of the floor panel 2 in the width direction. A canister 4 is provided on the left side of the fuel tank 3. On the right side of the fuel tank 3, an exhaust pipe 5 extending from the engine extends rearward. Further, in the present embodiment, assuming a case where a side collision occurs from the left side of the vehicle (right side in FIGS. 1 to 6), the leftward direction in the figure is set as the collision load input direction D1.

The fuel tank 3 is supported by the mounting frame 6. The mounting frame 6 has a rectangular frame-like planar shape, and supports the fuel tank 3 from below. The front end of the mounting frame 6 is supported by a vehicle body frame (not shown) in the engine room, and the rear end is supported by a cross member 7. The cross member 7 is hung between the side sills 8 and 8 installed on the left and right, and extends to the rear of the vehicle width. The side sill 8 extends in the vehicle length direction along the side edge of the vehicle body.

As shown in FIGS. 1 to 3, the undercover 1 according to the embodiment of the present invention is provided below the floor panel 2, and the fuel tank 3 and the canister installed below the floor panel 2. (In-vehicle parts) 4 is installed so as to cover it from below. The undercover 1 is made of a non-woven fabric. The front end of the undercover 1 extends to a position that covers the piping (not shown) of the canister 4, and the tip has a triangular shape. The rear end of the undercover 1 extends to the position of the rear cross member 9 below the rear seats. One end (left end) of the undercover 1 in the vehicle width direction extends below the canister 4 and extends to a position that covers the side sill inner 8a of the left side sill (body frame) 8. The other end (right end) of the undercover 1 in the vehicle width direction extends to a position covering the fuel tank 3 and extends to a position in front of the lower part of the exhaust pipe 5.

The undercover 1 is made of a cover body 10 made of a non-woven fabric. The cover body 10 has a plurality of attachment points to the vehicle body. The mounting points are distinguished according to the mounting position. For example, the mounting points on the input side are mounted on the vehicle body frame (the left side sill 8 in the present embodiment) that intersects the input direction of the collision load (orthogonal in the present embodiment). There is a point P1. A plurality of input side attachment points P1 are provided along the left edge portion of the cover main body 10 at intervals in the front-rear direction. The input side mounting point P1 is clipped to the bottom surface of the side sill inner 8a.

Further, as another mounting point, there is an anti-input side mounting point P2 located inside the vehicle body, which is on the tip side in the input direction with respect to the input side mounting point P1. A plurality of anti-input side mounting points P2 are provided at positions corresponding to the lower part of the mounting frame 6. The non-input side mounting point P2 is clipped to the bottom surface of the mounting frame 6. Of the mounting points P2 on the non-input side, two points at the front end are bolted.

Further, as another attachment point of the input side attachment point P1 and the non-input side attachment point P2, there is a third attachment point P3. A plurality of third attachment points P3 are provided along the rear end edge of the cover body 10 at intervals in the vehicle width direction. The third attachment point P3 is clipped to the bottom surface of a vehicle body frame (not shown) located at the rear end of the floor panel 2.

As shown in FIG. 4, in the undercover 1, the portion of the cover body 10 that is separated from the input side mounting point P1 inward in the vehicle width direction, which is the tip side in the input direction of the collision load of the side collision, is set low. There is. That is, the input side attachment point P1 of the cover main body 10 is configured to be at the highest position in the entire cover main body 10. Further, the non-input side attachment point P2 and the third attachment point P3 (see FIG. 1) are arranged below the input side attachment point P1. The bottom surface of the side sill inner 8a is located higher than the bottom surface of the cross member 7, the mounting frame 6, and the bottom surface of the rear body frame.

As shown in FIG. 3, in the vehicle width direction, the inner portion where the fuel tank 3 is arranged is a protection zone Z1 that is hard to be crushed at the time of a side collision, and the canister 4 and the side sill 8 on the side of the fuel tank 3 are provided. The arranged outer portion is a crushable zone Z2 having a lower rigidity than the protective zone Z1. The crushable zone Z2 is crushed at the time of a side collision and absorbs the collision load to reduce the collision load transmitted to the protection zone Z1. The input side attachment point P1 is located in the crushable zone Z2, and the non-input side attachment point P2 is located in the protection zone Z1.

As shown in FIG. 5, a fragile portion 7a is provided at a portion corresponding to the crushable zone Z2 at one end (left end) of the cross member 7. The fragile portion 7a has an arc-shaped cross section curved upward, and is easily compressed in the vehicle width direction when a lateral impact load is input. A fragile portion (not shown) is also provided at the other end (right end) of the cross member 7 where the exhaust pipe 5 is piped to protect the protection zone Z1. ..

As shown in FIGS. 1 and 3, the cover main body 10 is formed with a plurality of rows of bead portions 11 extending in the vehicle length direction along the side sill 8. The bead portion 11 has a convex cross section protruding downward. The convex cross-sectional depth d1 of the bead portion 11 located below the canister 4 is deeper than the convex cross-sectional depth d2 of the bead portion 11 located away from the canister 4 (below the fuel tank 3). In the present embodiment, the convex cross-sectional depths d1 of the plurality of bead portions 11 located below the canister 4 have substantially the same dimensions as each other. The convex cross-sectional depths d2 of the plurality of bead portions 11 below the fuel tank 3 are substantially the same as each other and are shallower than d1.

The bead portion 11 is formed by forming a plurality of rows of upward ridges 12 on a general surface (the surface of the cover body 10 before processing) that protrudes downward and is curved. The space between the adjacent ridges 12 and 12 and the remaining portion where the ridge 12 is not formed becomes a bead portion 11 projecting downward. The upward ridges 12 in the protection zone Z1 are formed over the entire length of the cover body 10 in the vehicle length direction. The ridges 12 in the crushable zone Z2 are not formed in the portion of the cover body 10 that covers the piping of the canister 4 at the front end.

As shown in FIG. 1, the ridges 12 formed on the cover body 10 located below the canister 4 are formed on the cover body 10 of other parts (below the fuel tank 3, the rear part of the cover body 10, etc.). It is formed more per unit area than the convex ridges 12, and a large number of ridges are formed. As a result, a large number of bead portions 11 are formed below the canister 4 of the crushable zone Z2, and the cover body 10 is easily deformed downward. The length of the ridge 12 located below the canister 4 in the vehicle length direction is shorter than the length of the ridge 12 located in the protection zone Z1 in the vehicle length direction. The shorter length of the ridge 12 located below the canister 4 in the vehicle length direction is about half the length of the ridge 12 located in the protection zone Z1 in the vehicle length direction.

Both ends of the ridge 12 in the vehicle length direction are shallower than the intermediate portion and are continuous with the general surface. That is, inclined surfaces 13 connecting the upper end surface of the ridge 12 and the general surface are formed at both ends of the ridge 12. The depth of the inclined surface 13 changes sequentially along the vehicle length direction, and serves as a guide for guiding the air flow during traveling.

Next, the action and effect of the undercover 1 according to the present embodiment will be described. As shown in FIG. 6, when the side sill 8 is deformed in the input direction (inside) due to the input of the collision load of the side collision, the canister 4 is pushed downward by the deformed floor panel 2 pushed by the side sill 8 (FIG. 6). (Indicated by the alternate long and short dash line). At this time, the undercover 1 moves by pushing the input side attachment point P1 of the cover body 10 inward together with the side sill 8, but since the inner portion of the cover body 10 is lower than the input side attachment point P1, it moves downward. It deforms to swell.

Further, the bead portion 11 having a convex downward cross section promotes the downward deformation of the undercover 1. Therefore, the undercover 1 does not hinder the movement of the canister 4 moving downward. Therefore, the canister 4 does not collide with the fuel tank 3, and damage to the fuel tank 3 can be prevented. Further, the bead portion 11 and the ridges 12 form the cover body 10 in a bellows shape when viewed in the vehicle width direction, so that the undercover 1 is easily deformed.

Further, in the present embodiment, the crushable zone Z2 is provided on the outer side in the vehicle width direction including the vehicle body frame (side sill 8), and the protective zone Z1 is provided on the inner side of the crushable zone Z2. In such an undercover 1, the anti-input side mounting point P2 located inside the tip side of the input direction D1 with respect to the input side mounting point P1 is arranged in the protection zone Z1. According to such a configuration, the separation distance between the input side mounting point P1 and the non-input side mounting point P2 can be increased. Therefore, the amount of downward displacement of the undercover 1 can be increased, and the downward movement of the canister 4 is further promoted.

Further, in the undercover 1, since the non-input side mounting point P2 is arranged below the input side mounting point P1, the input side mounting point P1 is pushed by the upper part of the undercover 1, and the cover main body. The downward displacement of 10 is promoted.

Further, the convex cross-sectional depth d1 of the bead portion 11 located below the vehicle-mounted member (canister 4) is deeper than the convex cross-sectional depth d2 of the bead portion 11 located below the fuel tank 3 away from the canister 4. Therefore, the collision load is concentrated on the bead portion 11 located below the canister 4 having a deep convex cross-sectional depth. Therefore, since the amount of displacement of the cover body 10 located below the canister 4 can be increased, the canister 4 moving downward and the undercover 1 do not interfere with each other.

In such an undercover, the bead portion 11 is formed by forming an upward ridge 12 on a curved general surface that protrudes downward, so that the general surface of the cover body 10 projects downward. It is curved and has a shape that easily deforms downward. Further, by shaping the upward ridges 12, the bead portion 11 having a convex cross section can be easily formed downward. Further, since the ridges 12 and the bead portion 11 are formed in the vehicle length direction, the rigidity strength in the vehicle length direction is increased.

Further, the ridges 12 located below the canister 4, which is an in-vehicle component arranged in the crushable zone Z2, are formed in a larger number than the ridges 12 in other portions. Therefore, the collision load is concentrated on the cover body 10 in the crushable zone Z2, and downward displacement is likely to occur. Further, since the length of the ridge 12 located below the canister 4 in the vehicle length direction is shorter than the length of the other portion in the length direction of the ridge 12, the ridge 12 below the canister 4 is concentrated. You can do a lot.

When the number of ridges 12 is increased, the air resistance on the bottom surface of the vehicle during traveling increases, but both ends of the ridges in the vehicle length direction are made shallower than the intermediate parts so as to be continuous with the general surface via the inclined surface 13. Therefore, the turbulence of the air flow under the floor can be prevented.

Further, the in-vehicle component is the canister 4, and the fragile portion 7a is formed in a portion (direction of the canister 4) located in the crushable zone Z2 of the cross member 7. Therefore, the fragile portion 7a is crushed by the side collision and the side sill 8 is displaced inward, so that the undercover 1 is displaced downward while the canister 4 moves downward. Further, since the cross member 7 in the protection zone Z1 is not easily crushed, the influence on the fuel tank 3 can be reduced.

Further, since the input side mounting point P1 is fixed to the bottom surface of the side sill 8 and the non-input side mounting point P2 is fixed to the bottom surface of the mounting frame 6 of the fuel tank 3, the input side mounting point P1 is fixed to the non-input side. The position is higher than the mounting point P2. Further, the fuel tank 3 and the canister 4 can be arranged under the floor to effectively use the space. Further, the undercover 1 does not hinder the downward movement of the canister 4.

Further, since the cover body 10 is made of a non-woven fabric, the undercover 1 can achieve both aerodynamic performance and sound absorption performance. Further, the weight of the undercover 1 can be reduced.

Further, in the present embodiment, one end (left end) in the vehicle width direction of the cover body 10 is located below the canister 4, and the other end (right end) in the vehicle width direction is located below the fuel tank 3. At the same time, it extends to the front position below the exhaust pipe 5. Therefore, since the undercover 1 does not cover the exhaust pipe 5, the exhaust heat can be efficiently released toward the outside air.

The undercover 1 according to the present embodiment has been described in detail with reference to the drawings, but the present invention is not limited to this, and can be appropriately changed without departing from the gist of the present invention. For example, the convex cross-sectional depth of the bead portion 11 is not limited to the above embodiment. As shown in FIG. 7, the convex cross-sectional depth d3 of the central bead portion 11 located below the canister 4 is the deepest, and the convex cross-sectional depth gradually becomes shallower as the distance from the canister 4 increases. May be good. Even in such a configuration, the collision load can be concentrated on the bead portion 11 below the canister 4 to promote the downward displacement.

1 Undercover 3 Fuel tank 4 Canister (vehicle parts)
5 Exhaust pipe 6 Mounting frame 7 Cross member 7a Vulnerable part 8 Side sill 10 Cover body 11 Bead part 12 Convex D1 Input direction P1 Input side mounting point P2 Anti-input side mounting point Z1 Protected zone Z2 Crumple zone

Claims (10)

In the undercover attached to the bottom of the vehicle
Of the attachment points of the cover body to the vehicle body, the part of the cover body that is separated inward from the tip side of the input direction with respect to the input side attachment point to the vehicle body frame that intersects the input direction of the collision load is set low. Being done
An undercover characterized in that the cover body extends along the vehicle body frame and has a bead portion having a convex cross section formed downward. A crushable zone is provided on the outside in the vehicle width direction including the vehicle body frame, and a protection zone is provided on the inside of the crushable zone.
The undercover according to claim 1, wherein the anti-input side attachment point located inside the tip side in the input direction with respect to the input side attachment point is arranged in the protection zone. The undercover according to claim 2, wherein the non-input side attachment point is arranged below the input side attachment point. 2. The convex cross-sectional depth of the bead portion located below the vehicle-mounted component arranged in the crushable zone is deeper than the convex cross-sectional depth of the bead portion located away from the vehicle-mounted component. Alternatively, the undercover according to claim 3. The undercover according to any one of claims 2 to 4, wherein the bead portion is formed by forming an upward ridge on a general surface that protrudes downward and is curved. cover. The upward ridges formed on the cover body located below the vehicle-mounted components arranged in the crushable zone are larger per unit area than the ridges formed on the cover body in other parts. As well as being formed, the length in the direction of the vehicle length is short,
The undercover according to claim 5, wherein both ends of the ridge in the vehicle length direction are shallower than the intermediate portion and continuous with the general surface. The in-vehicle parts are canisters provided on the side of the fuel tank.
A cross member is provided in front of or behind the fuel tank.
The undercover according to claim 4 or 6, wherein the cross member is provided with a fragile portion at an end. The input side mounting point is fixed to the side sill as the vehicle body frame, and is fixed to the side sill.
The undercover according to any one of claims 2 to 7, wherein the non-input side attachment point is fixed to a mounting frame of a fuel tank. The undercover according to any one of claims 1 to 8, wherein the cover body is made of a non-woven fabric. One end of the cover body in the vehicle width direction is located below the canister.
The other end of the cover body in the vehicle width direction is located below the fuel tank and extends to a front position below the exhaust pipe arranged on the side of the fuel tank opposite to the canister. The undercover according to claim 7, wherein the undercover is provided.

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