JP4692881B2 - Undercarriage of the vehicle - Google Patents

Description

  The present invention relates to a vehicle floor structure that efficiently introduces traveling wind to the engine side and imparts rigidity to a floor panel to a vehicle in which an engine is disposed under the floor of a vehicle body.

For vehicles such as one-box cars with integrated driver's seat and loading platform and trucks without bonnets, such as cab-over cars, an engine room is formed under the floor of the vehicle with the floor panel under the front seat, There is a type of so-called cab-over vehicle in which an engine is mounted in the engine room.
FIG. 11 is a schematic view of the cab-over vehicle. As shown in FIG. 11, a front hood 52 is provided in front of the vehicle 50, a front bumper 53 is attached to the lower portion of the front hood 52, and a dash panel 54 is provided behind the front hood 52 and the front bumper 53. It has been. An air intake port 53 a is formed in the front bumper 53, and a radiator 63 is disposed between the front hood 52 and the front bumper 53 and the dash panel 54.

A floor 51 of the vehicle 50 is provided with a front floor panel 56, an engine front panel 57, an engine rear panel 58, and a rear floor panel 59 in order from the front. The front floor panel 56 is connected to the lower end of the dash panel 54, and the rear floor panel 59 is used as a rear side seat or a cargo bed. An engine front panel 57 and an engine rear panel 58 connected between the floor panels 56 and 59 project upward from the floor panels 56 and 59 to form an engine room 60. A seat 61 is mounted on the engine room 60.
Actual Kosho 63-47584 JP 2001-310769 A Japanese Patent Publication No.58-52863

As shown in FIG. 11, during the traveling of the vehicle 50, air 62 is introduced from the air intake port 53 a of the front bumper 53, and the air 62 passes through the radiator 63, and from the lower side of the dash panel 54 to the front floor panel 56. Pass the lower side and go to the engine 64 side.
However, in such a vehicle lower structure, since the distance from the air intake 53a to the engine 64 is long, air as cooling air taken in from the air intake 53a is diffused below the front floor panel 56, and the engine There was a problem that it was difficult to flow efficiently.

An object of the present invention is to solve such problems and to provide a vehicle lower structure capable of supplying a large amount of air introduced from an air intake port to the engine side.

In order to solve the above problems, the present invention provides a front floor panel positioned in front of the vehicle, an engine room panel positioned at the rear of the front floor panel, protruding upward from the front floor panel, and having a front seat disposed at the top. In the lower structure of the vehicle in which the engine is disposed below the engine room panel, a tunnel portion through which air flows from the front of the vehicle to the engine side along the front-rear direction of the vehicle is formed in the front floor panel In addition, a cross member that intersects the tunnel portion is disposed at a lower portion of the tunnel portion, and the cross member includes a lower cross member having an inverted hat cross section and an upper cross member that closes the upper surface of the lower cross member. and reverse-hat cross-section the upper cross member located on left and right side portions of the cross member The upper cross member and the flange formed at the upper end of the lower cross member are overlapped and welded, and the left and right side portions of the cross member are welded to the front floor panel. A closed cross section is formed at two locations, upper and lower, between the member and the lower cross member and between the upper cross member and the front floor panel .
Further, the present invention lies in that the upper cross member in a portion located below the tunnel portion of the cross member is formed in a planar shape and is formed lower than the heights of the left and right side portions of the cross member.
Further, the surface height between the front flange and a rear flange of the upper cross member located on left and right side portions of the cross member, the surface height of the planar shape of the upper cross member located below the tunnel portion This is because they are almost identical.

The present invention comprises a front floor panel positioned in front of a vehicle, and an engine room panel positioned at the rear of the front floor panel, protruding upward from the front floor panel and having a front seat disposed at the upper portion thereof, In the lower structure of the vehicle in which the engine is disposed below the panel, a tunnel portion is formed in the front floor panel along the front-rear direction of the vehicle so that air flows from the front of the vehicle to the engine side, and the lower portion of the tunnel portion to dispose the cross member that intersects with the tunnel portion, wherein the cross member includes a lower cross member of the reverse hat-shaped cross section, composed of upper cross member for closing the upper surface of the lower cross member, the left and right of the cross member The upper cross member located on both sides is formed in a reverse hat cross-sectional shape, and the lower A flange formed on the upper end of the member and the upper cross member are overlapped and welded, and the left and right sides of the cross member are welded to the front floor panel, and between the upper cross member and the lower cross member, Since the closed cross section is formed between the upper cross member and the front floor panel at two locations, upper and lower, it is possible to make a large opening as a tunnel portion in front of the engine, and the driving wind (cooling) from the front of the vehicle to the engine side. Wind), cooling the engine and ventilating the engine installation part (engine room). As a result, the engine performance can be improved and the heat of the engine can be prevented from being transmitted to the engine room panel and the front floor panel, thereby reducing the heat effect on the vehicle interior. In addition, the normal cross member is an obstacle for the introduction of traveling wind, but the upper cross member of the portion located below the tunnel portion of the cross member is formed in a planar shape , and the right and left sides of the cross member are Since it is formed lower than the height of both sides, the influence on the wind introduction by the cross member can be reduced.
The cross member of the present invention is composed of a lower cross member having an inverted hat cross section and an upper cross member that closes the upper surface of the lower cross member, and is formed on the left and right sides of the cross member at the upper end of the lower cross member. Since the overlapped flange and the upper cross member are overlapped, and the overlapped portion and the front floor panel are welded, the upper cross member extends not only below the tunnel portion but also to the left and right of the cross member. In addition, the rigidity of the cross member and the rigidity of the floor can be improved.
Since the upper cross member located on both the left and right sides of the cross member of the present invention is formed in a reverse hat cross-sectional shape and overlapped with the flange of the lower cross member and welded to the front floor panel, The closed cross section is formed at two upper and lower positions between the lower cross member and between the upper cross member and the front floor panel, so that the rigidity of the cross member and the rigidity of the floor can be improved.
The Mendaka of the upper and the surface height between the front flange and rear flange of the cross member, the planar shape of the upper cross member located below the tunnel portion located at the right and left side portions of the cross member of the present invention Since the bending shapes of the cross members below the tunnel portion and on both sides thereof can be relaxed, stress concentration can be prevented, and rigidity and durability can be improved.

Hereinafter, embodiments of a vehicle lower structure according to the present invention will be described in detail with reference to the drawings.
1 is a schematic cross-sectional view of the front portion of a cab-over vehicle, FIG. 2 is a perspective view of a driver's seat around the floor panel, FIG. 3 is a plan view of the driver's seat, and FIG. 4 is a front view of FIG. FIG.
As shown in FIG. 1, a front hood 2 is provided at the front of the vehicle 1, a front bumper 3 is attached to the lower portion of the front hood 2, and behind the front hood 2 and the front bumper 3, the outside of the vehicle and the vehicle interior. A dash panel 4 for partitioning is provided. An air intake 3 a is formed in the front bumper 3, and a radiator 7 is disposed in a front room 6 formed between the front hood 2 and the dash panel 4.

  As shown in FIG. 2, the floor 5 of the vehicle 1 is composed of a front floor panel 9 positioned in front of the front seat 8 and a rear floor panel 10 positioned at the rear thereof, and between these floor panels 9, 10. The engine room panel 12 which protrudes upward and forms the engine room 11 is joined. The engine room panel 12 is formed by an engine front panel 13 whose front lower end is joined to the front floor panel 9 and an engine rear panel 14 whose rear lower end is joined (not shown) to the rear floor panel 10. ing. An engine 15 is mounted inside the engine room panel 12, and a service opening 16 through which the engine 15 can be inspected is formed on the upper side of the engine room panel 12. A front seat 8 composed of a seat cushion 17 and a seat back 18 is disposed on the engine room panel 12. The service opening 16 is closed by a seat cushion 17. The vehicle in FIG. 2 shows a right-hand drive vehicle, and the right side of the vehicle body is the driver's seat and the left side is the passenger seat side.

FIG. 5 shows a tunnel portion formed in the front floor panel 9, which is a cross-sectional view in the direction of the line AA in FIG. 3, and FIG. 6 is a cross-sectional view in the direction of the line BB in FIG. . The front floor panel 9 is formed with a tunnel portion 19 that protrudes upward in a tunnel shape from the reference surface of the front floor panel 9. Specifically, the front floor panel 9 includes a left floor side panel 20 positioned on the left side of the vehicle, and a floor center panel 22 that substantially forms the tunnel portion 19 with the right floor side panel 21 positioned on the right side of the vehicle. Yes. The left floor side panel 20 extends to the left side frame 23 and joined to the left front wheel house 24, and the right floor side panel 21 extends to the right side frame 25 and joined to the right front wheel house 26. Front wheel house members 46 and 47 are connected to the outside of the left and right front wheel houses 24 and 26.
The left and right side frames 23, 25 extending in the front-rear direction of the vehicle have beam front frames 29, 30 joined to the upper part of the reverse hat cross-sectional shape, and the side frames 23, 25 below the beam front frames 29, 30. Suspension frame reinforcements 31 and 32 joined to the bottom of 25 are joined.

As shown in FIG. 5, the tunnel portion 19 is formed at a position shifted to the left side (passenger seat side) of the vehicle 1, and the front side is at a high position as shown in FIG. 6, and is inclined toward the rear of the vehicle 1. A front inclined surface 33 inclined downward is formed, and a rear inclined surface 34 inclined obliquely upward toward the rear is formed on the rear side of the tunnel portion 19.
A cross member 35 shown in FIG. 7 is provided below the front floor panel 9 in the vehicle width direction so as to cross the tunnel portion 19. As shown in FIG. 8, the cross member 35 includes a lower cross member 36 disposed on the lower side and an upper cross member 37 disposed on the upper side. As shown in FIG. 5, in the cross member 35, the left and right end portions of the lower cross member 36 are joined to the side surfaces of the side frames 23, 25 on the inner side of the vehicle body via the left and right side brackets 38, 39.

  9 is a cross-sectional view in the direction of the line CC in FIG. 3, and FIG. 10 is a cross-sectional view in the direction of the line DD in FIG. As shown in these drawings and FIG. 6, the cross member 35 has a cross-sectional shape in the front-rear direction of the vehicle body, and the front lower portion of the lower cross member 36 is inclined downward toward the rear of the vehicle. Is formed. On the other hand, the upper cross member 37 is also formed in an inverted hat shape on both sides, and the flanges 36a, 36b and 37a, 37b of the lower and upper cross members 36, 37 are overlapped, and these flanges 36a, 36b and 37a, 37b and the corresponding left and right side floor panels 20, 21 are joined.

As shown in FIGS. 5 and 8, the upper surface of the upper cross member 37 is substantially flat at an intermediate position in the front-rear direction of the cross member 35, and the cross member 35 has a front inclined surface 33 and a rear inclined surface. It is provided between the surface 34.
As shown in FIGS. 4 and 8, the cross member 35 is formed with a recessed portion 40 that is recessed below the left and right sides of the cross member 35 below the tunnel portion 19. As shown in FIGS. 4 and 5, the concave portion 40 is disposed so as to be shifted further to the left side of the vehicle 1 than the tunnel portion 19, that is, to the passenger seat side. The cross member 35 is formed so that the bottom surface portions on the left and right sides of the upper cross member 37 and the height of the surface of the upper cross member 37 located below the tunnel portion 19 of the upper cross member 37 are substantially the same. Has been. And below the tunnel part 19, the surface of the upper cross member 37 is formed in a planar shape.
As shown in FIG. 8, a plurality of gap holes 40 a formed by inclined surfaces are formed in the overlapping portion of the upper and lower cross members 36 and 37 in the recess 40 of the cross member 35.

  As shown in FIG. 5, the side brackets 38, 39 that fix the cross member 35 to the side frames 23, 25 have bead-shaped drain holes 41 that project the side brackets 38, 39 inward of the vehicle 1. , 42 are formed (the parts other than the drain holes are in contact). Further, as shown in FIG. 8, circular drain holes 43 are formed at a plurality of locations between the front flange 37a and the rear flange 37b on the surface of the upper cross member 37. As shown in FIG. 8, the length of the upper cross member 37 in the vehicle width direction is shorter than the length of the lower cross member 36, and the outer side of the upper cross member 37 is open. Further, the lower cross member 36 is also formed with a plurality of circular drain holes 44 on its lower surface (only the left side is shown).

  The engine 15 shown in FIG. 4 is disposed below the seat 8 in an inclined state. Specifically, the axis of the crankshaft (not shown) of the engine 15 is disposed along the front-rear direction of the vehicle, and the cylinder head 15a is disposed on the vehicle left side (passenger seat side). That is, when viewed from the front of the vehicle, the cylinder head 15a portion faces the passenger seat side portion of the tunnel portion 19 and the cylinder portion 15b of the engine 15 and the space above the engine portion 15 face the driver seat side portion of the tunnel portion 19. 15 is arranged.

Next, the operation and effect of the vehicle lower structure according to the present invention will be described.
In the present embodiment, as shown in FIG. 1, the vehicle 1 takes in air (running wind) 48 from the air intake port 3 a of the front front bumper 3 during traveling and uses fins (not shown) of the radiator 7. It passes through and is introduced into the lower part of the dash panel 4. When the vehicle passes below the dash panel 4, the introduced air 48 is moved along the front inclined surface 33 by the front inclined surface 33 formed on the front floor panel 9 so as to be inclined downward toward the rear of the vehicle. Flows diagonally downward toward the rear. By forming the front inclined surface 33 at the entrance portion of the tunnel portion 19, a large cross-sectional opening can be provided in front of the vehicle and a larger amount of traveling wind can be guided into the tunnel portion 19. The front inclined surface 33 may be provided in the lower part of the dash panel 4 or may be configured by both the front floor panel 9 and the dash panel 4. It is necessary to secure a wide space for the occupant to improve the comfort of the occupant, and the shape of the tunnel portion 19 cannot be increased, but a large amount of air can be guided to the tunnel portion 19 by the front inclined surface 33. Therefore, the width of the tunnel part 19 and the tunnel height can be minimized while ensuring the introduction of cooling air, and the influence on the walk-through performance of passengers such as the driver's seat and the passenger seat can be minimized. it can.

The traveling wind that has passed through the tunnel portion 19 reaches below the engine front panel 13.
At this time, the front floor panel 9 is coupled to the engine front panel 13 constituting the front vertical wall of the engine room 11 below the seat 8 at the rear, and the engine front panel 13 is swelled to the vehicle interior (upper) side at this coupling portion. Is formed in a step-like manner, so that a negative pressure is generated on the inside by the space of the protrusion and the flow of the traveling wind, and the traveling wind flowing through the tunnel portion 19 is caused to flow into the engine room 11. Can be led upward. That is, the flow of the traveling wind is controlled to guide the wind between the vehicle 1 and the engine 15 (on the upper side of the engine), improve the cooling performance of the engine, and improve the ventilation of the engine room 11. In particular, the heat of the engine 15 can be prevented from being transmitted to the engine room panel and the front floor panel, and the heat effect on the vehicle interior can be reduced, the cooling effect of the vehicle interior is improved, and passenger comfort is improved. improves.

  The engine front panel 13 extends obliquely upward so that the upper side is the rear side of the vehicle 1 in consideration of the air flow, and the air flow flows along the engine front panel 13. Wind is guided between the engines 15 (upper side of the engine).

  In the recess 40 of the cross member 35, the upper surface is formed in a substantially flat surface so as to follow the flow of wind, and the position of the cross member 35 is an intermediate portion of the tunnel portion 19 formed in substantially the same cross section in the front-rear direction, that is, the tunnel. Since the portion is located between the front side inclined surface 33 and the rear side inclined surface 34, the effect of rectifying the traveling wind by the upper surface can be expected. In addition, the lower side (lower front portion) of the cross member 35 has a shape that descends obliquely downward toward the rear of the vehicle, so that the traveling wind hitting the cross member 35 can flow smoothly to the lower side of the cross member 35. As a result, the generation of wind noise by the cross member 35 can be suppressed.

Next, draining will be described.
In the embodiment of the lower structure of the vehicle in the present invention, the relationship between the upper cross member 37 and the front floor panel 19 is opened at the position of the tunnel portion 19. Water will intrude in the meantime, and it is necessary to discharge the infiltrated water in order to prevent rusting of the vehicle.
In the embodiment of the present invention, the left and right ends of the cross member 35 are fixed to the side surfaces of the side frames 23 and 25 via the side brackets 38 and 39. The bead-shaped drain holes 41 and 42 are formed in the side bracket by forming a bead partly spaced from the side surface of the side frame at the lower joint between the side brackets 38 and 39 and the side frames 23 and 25. Therefore, the water accumulated in the lower cross member 36 can be drained.
A drain hole 43 is also provided on the upper surface of the upper cross member 37 excluding the recess 40. This position is not exposed to the traveling wind and is less likely to generate wind noise due to the water drain hole 43. Further, even if the water drain hole 43 is formed, this position is a portion where there is little reduction in rigidity. Water that has entered the space between them (intrusion from below the tunnel portion 19) can be dropped downward. In addition to the drain hole 43, both ends of the upper cross member 37 do not reach the side frames 23 and 25 and are open, so that the infiltrated water joins the cross member 35 and the side frames 23 and 25. Falls into the side brackets 38, 39. The dropped water can be discharged from the bead-shaped drain holes 41 and 42 to the outside of the vehicle.

  Further, since the drain hole 44 is formed in the lower surface of the lower cross member 36, the drain hole 43, 44 facilitates the entry and discharge of the electrodeposition coating paint to the cross member 35, and rust. It is also effective for prevention. The joint flange of the cross member 35 located on the lower side of the tunnel portion 19 is formed between the upper and lower flanges 36a, 37a and 36b, 37b with an inclined surface so that the end portions of the flanges are formed. A plurality of gap holes 40a formed by being separated are formed. This is because the coating does not easily reach the end faces of the flanges 36a, 37a and 36b, 37b during undercoating, and rust may be generated, and the coating quality (durability) can be improved by the gap holes 40a.

Although the embodiments of the present invention have been described above, modifications and changes can of course be made based on the technical idea of the present invention.
For example, in the above-described embodiment, the recess 40 surface located at the lower part of the tunnel portion of the upper cross member is substantially horizontal, but the recess 40 surface may be an inclined surface based on the arrangement state of the engine, etc. Needless to say, the present invention can be implemented with appropriate modifications within the scope of the invention.

It is sectional drawing which looked at the motor vehicle front part which employ | adopted the lower structure of the vehicle in embodiment of this invention from the horizontal direction. It is the perspective view which looked at the automobile front part of Drawing 1 from the front diagonally upper part. It is a top view of the motor vehicle front part of FIG. It is the front view which looked at the automobile front part of Drawing 3 from the front of vehicles. It is sectional drawing of the AA line direction of FIG. It is sectional drawing of the BB line direction of FIG. It is a perspective view of the cross member arrange | positioned between the side frame arrange | positioned in the motor vehicle front part of FIG. 1, and a side frame. It is a perspective view of the cross member of FIG. It is sectional drawing of the CC line direction of FIG. It is sectional drawing of the DD line direction of FIG. It is sectional drawing (corresponding to FIG. 1) of the motor vehicle which employ | adopted the lower structure of the vehicle by a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 2a Air intake 8 Seat 9 Front floor panel 10 Rear floor panel 11 Engine room 12 Engine room panel 13 Engine front panel 14 Engine rear panel 15 Engine 19 Tunnel part 23,25 Side frame 33 Front side inclined surface 35 Cross member 36 Lower cross member 37 Upper cross member 38, 39 Side bracket 40 Recess 41, 42, 43 Drain hole

Claims (3)

A front floor panel located in front of the vehicle, and an engine room panel located at the rear of the front floor panel, projecting upward from the front floor panel and having a front seat disposed at the top, and below the engine room panel In the lower structure of the vehicle in which the engine is disposed, the front floor panel is formed with a tunnel portion through which air flows from the front of the vehicle to the engine side along the longitudinal direction of the vehicle, and the tunnel portion is formed below the tunnel portion. The cross member is composed of a lower cross member having an inverted hat-shaped cross section and an upper cross member that closes the upper surface of the lower cross member.
Forming the upper cross member located on the left and right sides of the cross member in a reverse hat cross-sectional shape;
While superposing and welding the flange formed on the upper end of the lower cross member and the upper cross member,
At the left and right sides of the cross member, the front floor panel is welded,
A lower structure of a vehicle, characterized in that a closed cross section is formed at two positions, upper and lower, between an upper cross member and a lower cross member and between an upper cross member and a front floor panel . 2. The upper cross member of a portion of the cross member located below the tunnel portion is formed in a planar shape, and is formed lower than the heights of the left and right side portions of the cross member. Substructure of the vehicle. Substantially the same surface height of the planar shape of the upper cross member located the surface height between the front flange and a rear flange of the upper cross member located on left and right side portions of the cross member, below the tunnel portion The vehicle lower structure according to claim 2, wherein the vehicle lower structure is configured as described above.

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