JP5358284B2 - Lower body floor structure - Google Patents

Description

  The present invention relates to a vehicle body floor lower structure.

  As a conventional vehicle body floor lower structure, a structure in which the lower surface of the floor is reinforced by a reinforcing member so as to be able to withstand a collision load at the time of a side collision is known (for example, see Patent Document 1).

2 and 4 of Patent Document 1 will be described with reference to FIGS. 7 and 8 below. In addition, the code | symbol was reassigned.
As shown in FIGS. 7 and 8, the front floor 100 includes a pair of left and right front floor body portions 101 and 101 and a tunnel portion 102 provided between the front floor body portions 101 and 101. A tunnel lower reinforcement 104 as a reinforcing member is provided on the lower surface of the tunnel portion 102. Reference numeral 105 denotes a cross member attached to the upper portion of the front floor main body 101 so as to extend in the vehicle width direction.
The reinforce 104 under the tunnel includes a reinforce upper portion 106 and a mountain-shaped reinforce lower portion 107 coupled to the lower portion of the reinforce upper portion 106.

JP 2005-297610 A

Although the rigidity of the tunnel portion 102 is improved by the reinforce under the tunnel 104, the reinforce lower portion 107 has a structure opened downward, and therefore cannot efficiently receive a collision load at the time of a side collision. In addition, since unevenness is formed on the lower surface of the reinforcement lower portion 107, the air flow flowing under the front floor 10 is disturbed.
An object of the present invention is to provide a vehicle body floor lower structure capable of efficiently increasing rigidity in the vehicle width direction and improving aerodynamic performance.

  According to the first aspect of the present invention, there is provided a vehicle body floor lower structure in which a tunnel portion extending in the front-rear direction is formed in the floor to accommodate the left and right exhaust pipes extending in the front-rear direction below the vehicle floor, and the lower portion of the tunnel portion is covered with an under cover. The under cover is formed of a metal member, and a rigid member that connects the lower portion of the tunnel portion in the vehicle width direction and a guide surface that covers the front surface of the rigid member and rectifies the airflow below the vehicle body are formed. The front rectifying plate has a front opening V-shaped notch that passes rearward in a state where the left and right exhaust pipes are arranged parallel to each other.

The front opening V-shaped notch reduces the unevenness of the front rectifying plate while avoiding interference between the front rectifying plate and the exhaust pipe, and rectifies the air flow flowing under the floor.
Moreover, the left and right floors of the tunnel portion are connected by the rigid member, and the rigidity of the tunnel portion in the vehicle width direction is efficiently increased.
Furthermore, the front surface of the rigid member is covered by the guide surface, and the air flow is rectified.

In the invention according to claim 2, the left and right exhaust pipes are arranged so that the interval between the left and right exhaust pipes increases toward the silencer connected to the rear end of the exhaust pipe as it goes rearward. The undercover is provided with a rear rectifying plate at the rear of the rigid member, and the rear rectifying plate is arranged between the left and right exhaust pipes that are spaced apart from each other. It has a rectifying groove that is recessed upward in shape.
Due to the triangular shape of the rectifying groove recessed upward, the air in the rectifying groove smoothly flows backward.

According to a third aspect of the present invention, the left and right exhaust pipes are connected to each other in the exhaust pipe connecting portion, and the diameter of each of the exhaust pipe connecting portions is increased as compared with other parts. It is characterized by having an interference relief part to avoid.
The gap between the large diameter portion of the exhaust pipe and the rear rectifying plate is absorbed by the interference relief portion of the rear rectifying plate, and there is no need to lower the rear rectifying plate.

  In the invention according to claim 1, the under cover is formed of a metal member, a rigid member that connects the lower portion of the tunnel portion in the vehicle width direction, and a guide that covers the front surface of the rigid member and rectifies the air flow below the vehicle body. A front rectifying plate having a surface, and the front rectifying plate has a front opening V-shaped notch that passes rearward in a state where the left and right exhaust pipes are arranged parallel to each other. The tube can be aligned to the center of the front-opening V-shaped notch to reduce the unevenness of the undercover, and along with this, the air flow flowing under the floor is rectified by the front rectifying plate, Lower aerodynamic performance can be improved. Furthermore, even if the height of the rigid member is increased, the rectifying effect is enhanced by the guide surface, so that both high rigidity and high aerodynamic performance can be achieved.

  In the invention according to claim 2, the left and right exhaust pipes are arranged so that the interval between the left and right exhaust pipes increases toward the silencer connected to the rear end of the exhaust pipe as it goes rearward. The undercover is provided with a rear rectifying plate at the rear of the rigid member, and the rear rectifying plate is arranged between the left and right exhaust pipes that are spaced apart from each other. Since the shape has the rectifying groove that is recessed upward, the space in the rectifying groove is smoothly expanded rearward, and the air flow under the floor during traveling can be smoothly flowed without being disturbed.

  In the invention according to claim 3, the left and right exhaust pipes are connected to each other in the exhaust pipe connecting portion, and the respective diameters are increased as compared with other parts, and the rear rectifying plate causes interference with the exhaust pipe connecting portion. Since the interference escape portion to be avoided is provided, it is not necessary to lower the rear flow straightening plate, and the ground height of the undercover can be ensured.

1 is a perspective view of a vehicle showing a vehicle body floor lower structure according to the present invention. It is a top view which shows the exhaust apparatus which concerns on this invention. It is a principal part perspective view which shows the vehicle body floor lower part structure which concerns on this invention. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a perspective view of the undercover concerning the present invention. FIG. 6 is a sectional view taken along line 6-6 of FIG. It is sectional drawing which shows the conventional vehicle body floor lower part structure. It is a perspective view of the reinforcement member with which the conventional vehicle body floor lower part structure is equipped.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the description, left, right, front, and rear indicate directions based on the driver who has boarded the vehicle. The drawings are to be viewed in the direction of the reference numerals.

Examples of the present invention will be described. The arrow (FRONT) in the figure represents the front of the automobile.
As shown in FIG. 1, a floor panel 11 is provided at a lower portion of a vehicle body 10 of an automobile, and a tunnel portion 12 extending in the front-rear direction is provided at the center of the floor panel 11 in the vehicle width direction. A part of the exhaust device 13 extending rearward from (not shown) is passed, and the lower portion of the exhaust device 13 is covered with an under cover 15 attached to the floor panel 11.

  The vehicle body 10 includes side sills 21 and 21 disposed on both sides of the floor panel 11, front fenders 22 and 22 disposed in front of the side sills 21 and 21, rear fenders 23 and 23 disposed behind the side sills 21 and 21, and a rear fender. 23, a rear bumper 24 disposed behind the vehicle.

  As shown in FIG. 2, the exhaust device 13 includes a left exhaust manifold 31 and a right exhaust manifold 32 connected to the engine, and a left exhaust connected to the rear ends of the left exhaust manifold 31 and the right exhaust manifold 32. A pipe 33 and a right exhaust pipe 34, a silencer 36 connected to the rear ends of the left exhaust pipe 33 and the right exhaust pipe 34, and extending rearward from both ends of the silencer 36. And the tail pipes 38, 38 and a connecting pipe 39 for connecting the left exhaust pipe 33 and the right exhaust pipe 34 respectively.

  The left exhaust pipe 33 includes an exhaust pipe front part 41 and an exhaust pipe rear part 42 connected to the rear end of the exhaust pipe front part 41. The exhaust pipe front part 41 includes a first catalyst 45 and a second catalyst 46, A large diameter portion 47 is provided in the exhaust pipe rear portion 42.

The right exhaust pipe 34 includes an exhaust pipe front portion 51 and an exhaust pipe rear portion 52 connected to the rear end of the exhaust pipe front portion 51. The exhaust pipe front portion 51 includes a first catalyst 55 and a second catalyst 56, A large diameter portion 57 is provided in the exhaust pipe rear portion 52.
The large diameter portion 47 and the large diameter portion 57 are connected by a connecting pipe 39.

The exhaust pipe rear portions 42 and 52 are arranged in parallel so as to approach the center from the front end portion, and are arranged so that the interval between the exhaust pipe rear portions 42 and 52 gradually increases behind the parallel arrangement portion.
The large-diameter portions 47 and 57 are the portions having the largest outer diameter among the exhaust pipe rear portions 42 and 52 described above, and are disposed at portions where the intervals between the exhaust pipe rear portions 42 and 52 are widened.

  As shown in FIG. 3, the under cover 15 (the outline is shown by a thick line) is attached to the floor panel 11 on both sides of the tunnel portion 12 with a plurality of screws, and the left panel 61 and the floor panel 11 constituting the floor panel 11 A cross member 64 passed over each of the right panels 62 so as to straddle the tunnel portion 12, a front rectifying plate 65 attached to the front portion of the cross member 64 with a plurality of screws, and a plurality of members at the rear portion of the cross member 64 It consists of a rectifying plate 66 attached with screws.

  The front rectifying plate 65 has a front opening V-shaped notch 65a formed in the front, and the exhaust pipe rear part 42 of the left exhaust pipe 33 and the exhaust pipe rear part 52 of the right exhaust pipe 34 are formed in the notch 65a. Is passed to the center of the car.

If the notch 65a is not provided, the front rectifying plate 65 bulges downward to avoid the exhaust pipe rear portions 42 and 52, and the front rectifying plate 65 has irregularities. The air flow below 65 will be disturbed, leading to a decrease in aerodynamic performance.
On the other hand, by providing the front rectifying plate 65 with the notch portion 65a, the front rectifying plate 65 can be made flatter, the air flow is hardly disturbed, and the aerodynamic performance can be improved.

The rear straightening plate 66 has left and right side walls 66a and 66b (only one reference numeral 66b is shown) extending rearward along the left and right exhaust pipe rear portions 42 and 52 whose intervals are gradually increased toward the rear. In order to avoid interference between the straightening rectification groove 66c formed in a triangular shape in bottom view and the left and right large-diameter portions 47 and 57 on both sides of the rectification groove 66c, an interference escape formed in a long hole shape is provided. Holes 66d and 66e are provided.
Since the inner space of the rectifying groove 66c is smoothly expanded rearward, the air can smoothly flow without disturbing the air flow below the rear rectifying plate 66.

  If the rear rectifying plate 66 is not provided with the interference relief holes 66d and 66e, the rear rectifying plate 66 may be bulged downward to avoid interference with the large diameter portions 47 and 57, or the rear rectifying plate 66 Although it is necessary to move the position downward, by providing the interference escape portions 66d and 66e, it is not necessary to bulge the rear rectifying plate 66 downward to increase the unevenness or to lower the position of the rear rectifying plate 66. The ground height of the rear flow straightening plate 66 and, consequently, the under cover 15 can be ensured.

  As shown in FIG. 4, the floor panel 11 includes a left panel 61 and a right panel 62 and a tunnel portion 12 joined therebetween, and a heat shield 71 having a U-shaped cross section inside the tunnel portion 12. The propeller shaft 72, the left exhaust pipe 33, and the right exhaust pipe 34 (specifically, the exhaust pipe rear portions 42 and 52) are disposed inside the heat shield plate 71, and the under cover is provided on the left panel 61 and the right panel 62. 15 is delivered and installed.

  As shown in FIG. 5, the cross member 64 includes an intermediate portion 64a and upper convex portions 64b and 64c protruding upward on both sides of the intermediate portion 64a, and the front lower portion and the rear lower portion respectively in the vehicle width direction. A front flange 64d and a rear flange 64e are provided.

The upper convex portion 64b is attached to the left panel 61 (see FIG. 4), and the upper convex portion 64c is attached to the right panel 62 (see FIG. 4).
A front rectifying plate 65 is attached to the front flange 64d, and a rear rectifying plate 66 is attached to the rear flange 64e.

  In the figure, reference numeral 64f denotes a screw insertion hole for passing a screw for attaching the upper convex portions 64b and 64c to the floor panel 11, 65f denotes a screw insertion hole for passing a screw for attaching the front end of the front rectifying plate 65 to the floor panel 11, and 66f denotes a rear. These are screw insertion holes through which screws for attaching both ends of the current plate 66 to the floor panel 11 are passed.

  As shown in FIG. 6, the intermediate portion 64 a (see also FIG. 5) of the cross member 64 is a U-shaped section that opens upward, and the upper protrusions 64 b and 64 c (the upper protrusion 64 c (see FIG. 6)). 5))) is a part of a rectangular closed cross section whose section is vertically long.

  When the height of the intermediate portion 64a is H1, and the height of the upper convex portions 64b and 64c is H2, the height of the cross member 64 with respect to the load acting in the vehicle width direction is improved by increasing the heights H1 and H2. Can be made.

However, if the heights H1 and H2 of the cross member 64 are simply increased, the front wall 64h of the cross member 62 will be orthogonal to the air flow from the front of the vehicle, thereby disturbing the air flow.
Therefore, by providing the front rectifying plate 65 with an inclined surface 64j that is rearwardly lowered so as to cover the front of the front wall 64h of the cross member 64, the air flow that flows below the under cover 15 flows smoothly backward. be able to.

  As shown in FIGS. 1 and 3 above, the floor panel 11 is moved back and forth to accommodate the left exhaust pipe 33 and the right exhaust pipe 34 as left and right exhaust pipes extending forward and backward under the floor panel 11 of the vehicle. In the vehicle body floor lower structure in which an extending tunnel portion 12 is formed and the lower portion of the tunnel portion 12 is covered with an under cover 15, the under cover 15 is formed of a metal member, and the rigidity for connecting the lower portion of the tunnel portion 12 in the vehicle width direction A cross member 64 as a member, and a front rectifying plate 65 that covers the front surface of the cross member 64 and is formed with an inclined surface 65j as a guide surface that rectifies the air flow below the vehicle body. In addition, the left exhaust pipe 33 and the right exhaust pipe 34 have a front opening V-shaped notch 65a that passes rearward with the left exhaust pipe 33 and the right exhaust pipe 34 being arranged in parallel to the center. The trachea 34 can be aligned to the center side of the front opening V-shaped cutout portion 65a to reduce the unevenness of the under cover 15, and at the same time, the front rectifying plate 65 allows the lower side of the floor panel 11 and the under cover 15 to be lowered. By rectifying the flowing air flow, the aerodynamic performance at the lower part of the vehicle body floor can be improved. Further, even if the height of the cross member 64 is increased, the rectifying effect is enhanced by the inclined surface 65j, so that both high rigidity and high aerodynamic performance can be achieved.

  As shown in FIGS. 2 and 3 above, the rear ends of the left exhaust pipe 33 and the right exhaust pipe 34 as they go rearward behind the portion where the left exhaust pipe 33 and the right exhaust pipe 34 are moved toward the center. The rear cover 15 is provided with a rear rectifying plate 66 at the rear portion of the cross member 64, and the rear rectifying plate 66 is arranged at a distance from each other. Between the left exhaust pipe 33 and the right exhaust pipe 34, which are widened, the left exhaust pipe 33 and the right exhaust pipe 34 have a rectifying groove 66c that is recessed upward in a triangular shape along the left and right sides. The interior space has a shape that smoothly expands rearward, and the airflow below the floor panel 11 and the undercover 15 during traveling can be smoothly flowed without being disturbed.

  Further, the left exhaust pipe 33 and the right exhaust pipe 34 are large diameter portions 47 and 57 as exhaust pipe connecting portions connected to each other, and the respective diameters are increased as compared with other portions. Since the interference relief holes 66d and 66e serving as interference relief portions that avoid interference with the large diameter portions 47 and 57 are provided, the rear flow straightening plate 66 need not be lowered, and the ground height of the undercover 15 can be ensured.

  The vehicle body floor lower structure of the present invention is suitable for automobiles.

  DESCRIPTION OF SYMBOLS 11 ... Floor (floor panel), 12 ... Tunnel part, 15 ... Under cover, 33 ... Exhaust pipe (left exhaust pipe), 34 ... Exhaust pipe (right exhaust pipe), 36 ... Silencer, 47, 57 ... Exhaust pipe connection part (Large diameter part), 64 ... rigid member (cross member), 64j ... guide surface (inclined surface), 65 ... front rectifying plate, 65a ... notch, 66 ... rear rectifying plate, 66c ... rectifying groove, 66d, 66e ... interference relief (interference escape hole).

Claims (3)

In the vehicle body floor lower structure in which a tunnel portion extending in the front-rear direction is formed in the floor to accommodate the left and right exhaust pipes extending in the front-rear direction below the vehicle floor, and the lower portion of the tunnel portion is covered with an under cover.
The under cover is formed of a metal member, and a rigid member that connects the lower portion of the tunnel portion in the vehicle width direction, and a guide surface that covers the front surface of the rigid member and rectifies the air flow below the vehicle body are formed. A front rectifying plate, and a front lower rectifying plate having a front-opening V-shaped notch for passing the left and right exhaust pipes in a state of being arranged parallel to each other in the center. Construction.   The left and right exhaust pipes are arranged so that the distance between the left and right exhaust pipes increases toward the silencer connected to the rear end of the exhaust pipe as it goes rearward, and the under cover. Is provided with a rear flow straightening plate at the rear of the rigid member, and the rear flow straightening plate is located between the left and right exhaust pipes, which are spaced apart from each other, in a triangular shape along the left and right of the exhaust pipes. The vehicle body floor lower part structure according to claim 1, further comprising a rectifying groove that is recessed. The left and right exhaust pipes are connected to each other, and the diameters of the exhaust pipe connection parts are larger than those of other parts, and the rear rectifying plate has an interference relief part that avoids interference with the exhaust pipe connection part. vehicle body floor substructure according to claim 2, wherein you characterized in that it has.

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