JP4023506B2 - Lower body structure of automobile - Google Patents

Description

  The present invention relates to a lower body structure of an automobile, and relates to a measure for improving the bending rigidity and torsional rigidity of a vehicle body.

  Generally, a floor panel provided so as to form a floor surface of a passenger compartment, a cowl box provided to extend in a vehicle width direction at a position above the front end of the vehicle front-rear direction of the floor panel, and the floor panel and the cowl A dash panel is provided to connect the boxes to each other, and the upper end flange is joined to the bottom wall of the cowl box, and the dash panel is provided on the floor panel so as to extend rearward from the center in the vehicle width direction. An example of a lower body structure of an automobile comprising a tunnel portion formed in the vehicle and a pair of side frames provided on both sides so as to extend in the vehicle longitudinal direction and to be arranged in the vehicle width direction is disclosed in, for example, Japanese Utility Model Laid-Open No. 3-126778. What has been described is known.

  In this device, a dash cross member is provided on the engine room side of the dash panel, and both ends thereof are coupled to the side frames on both sides, so that the strength in the vicinity of the dash panel can be secured.

  In addition, the dash cross member has a central portion extending in the rear direction in the vehicle width direction, and the extended portion partitions the inside of the tunnel portion to form a closed cross-sectional shape, thereby increasing the strength of the tunnel portion. By absorbing the impact load from the side frame, it is possible to reduce the impact load applied to the side frame.

  Furthermore, on the tunnel part, the position extends from the position vertically overlapping the rear end of the extension part to the position of the cross member provided on the floor panel in the vehicle width direction and straddling the tunnel part. A tunnel rain reinforcement is provided, and a closed cross section is formed between the tunnel rain reinforcement and the tunnel portion, so that the capacity of absorbing the collision load by the tunnel portion is increased.

  However, in the above-described conventional example, for example, if it is considered to be compatible with an open car, it is difficult to obtain sufficient bending rigidity and torsional rigidity of the vehicle body. Therefore, there is still room for improvement.

The present invention has been made in view of such a point, and a main object of the present invention is to enable the dash cross member and the rear cross member to be effectively connected, so that the vehicle body can be adapted to an open car. An object is to further improve the bending rigidity and torsional rigidity.

  In order to achieve the above object, in the invention of claim 1, the tunnel rain reinforcement is further extended rearward, and the dash cross member and the rear cross member are connected to each other by the tunnel rain reinforcement, so-called A backbone frame structure was formed, which made it possible to further improve the bending rigidity and torsional rigidity of the vehicle body.

  Specifically, in the present invention, a floor panel provided so as to form a floor surface of a passenger compartment, and a cowl box provided so as to extend in the vehicle width direction above the front end of the floor panel in the vehicle front-rear direction. And a dash panel formed so as to connect the floor panel and the cowl box to each other and having an upper end joined to the cowl box, and the floor panel so as to extend rearward from the center in the vehicle width direction of the dash panel. It is assumed that the vehicle has a lower vehicle body structure including a tunnel portion that protrudes upward and a pair of side frames that extend in the vehicle longitudinal direction and are arranged in the vehicle width direction.

The side frame is disposed so as to extend in the vehicle front-rear direction along the floor panel, and a front portion disposed so as to extend in the vehicle front-rear direction at a position higher than the floor panel in front of the passenger compartment. And a rear portion arranged to extend in the vehicle front-rear direction at a position higher than the floor panel behind the passenger compartment, and forms a closed cross-section in cooperation with the dash panel. And a pair of members whose one ends are connected to the front portion of the side frame, a front rear connecting member that is provided to extend in the vehicle width direction and connects the rear portions of the side frames, side rear after provided from the front rear connecting member so as to extend in the vehicle width direction at a position spaced rearward connecting rear portions of both side frames A loss member and a tunnel rain reinforcement that is provided so as to extend in the vehicle front-rear direction along the tunnel portion and forms a closed cross-section at a position spaced apart from the middle portion of the side frame in cooperation with the tunnel portion. Be prepared. In addition, the front end side of the tunnel rain hose is connected to each other end of the pair of members, while the rear end side is connected to the center in the vehicle width direction of the front rear connection member , and the tunnel rain hose is connected. The upper part of the rear end of the ment is connected to the front rear connecting member at substantially the same height .

  In the above configuration, a front cross member may be provided that extends in the vehicle width direction at a position spaced forward from the dash cross member and connects the front portions of the side frames. .

  The rear end side of the tunnel rain reinforcement and the rear rear cross member may be connected by a member.

Furthermore, when a diagonal member extending from the rear end side of the tunnel rain reinforcement toward the vehicle width direction outward and rearward is provided, instead of the front rear connecting member and the rear rear cross member, by the diagonal member, You may make it connect the rear-end side of a tunnel rain reinforcement with the rear part of both side frames.

According to the present invention, a floor panel provided to form a floor surface of a passenger compartment, a cowl box provided to extend in the vehicle width direction at a position above the front end of the floor panel in the vehicle front-rear direction, and A dash panel provided so that the floor panel and the cowl box are connected to each other, the upper end of which is joined to the cowl box, and the dash panel extending upward on the floor panel so as to extend rearward from the center in the vehicle width direction. The above-mentioned side frame is mounted on a lower body structure of an automobile having a tunnel portion provided in a protruding manner and a pair of side frames provided on both sides so as to extend in the vehicle longitudinal direction and to be arranged in the vehicle width direction. A front portion arranged to extend in the vehicle front-rear direction at a position higher than the floor panel in front of the room, and the vehicle along the floor panel The dash panel includes an intermediate portion arranged to extend rearward and a rear portion arranged to extend in the vehicle front-rear direction at a position higher than the floor panel behind the passenger compartment. And a closed section formed in cooperation with each other, a pair of members each connected to the front portion of the side frame, and a pair of members extending in the vehicle width direction. A front rear connecting member to be connected, a rear rear cross member that extends in the vehicle width direction at a position spaced rearward from the front rear connecting member, and connects the rear portions of the two side frames; and the tunnel Is provided so as to extend in the vehicle front-rear direction along the portion, and in cooperation with the tunnel portion, at a position spaced above the intermediate portion of the side frame. Let a tunnel reinforcement hose reinforcement that forms a cross-section, on its the front side of the tunnel a reinforcement reinforcement while connected to the other end of each of the members of the pair, the rear side of the front-side rear connecting member Since the backbone frame structure is formed by being connected to the center in the vehicle width direction, the flexural rigidity and torsional rigidity of the vehicle can be improved and the vehicle can be adapted to an open car. At this time, since the tunnel rain reinforcement and the tunnel portion cooperate to form a closed cross section, both the bending rigidity and the torsional rigidity can be greatly improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 schematically shows an overall configuration of a lower body structure of an automobile according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a floor panel that forms the floor surface of the passenger compartment. The floor panel 1 is provided at a position above the front end in the vehicle longitudinal direction so as to extend in the vehicle width direction as shown in FIG. A cowl box 2 is arranged. A dash panel 3 is disposed between the floor panel 1 and the cowl box 2 so as to connect the two to each other, and an upper end flange 3 a is joined to the bottom wall of the cowl box 2. Further, at the center of the dash panel 3 and the floor panel 1 in the vehicle width direction, a tunnel portion 4 having a reverse concave shape with a cross-section protruding upward and having a lower surface opened is provided so as to extend in the vehicle front-rear direction. A pair of side frames 5, 5 are arranged on the lower surface side of the floor panel 1 so as to extend in the vehicle front-rear direction and to be arranged in the vehicle width direction.

  Further, on the side of the dash panel 3, a dash cross member 6 that connects the front portions 5 a and 5 a of the side frames 5 and 5 and forms a closed cross-section in cooperation with the dash panel 3 is a dash panel member 6. It is provided so as to straddle the tunnel portion 4 along the panel 3. On the other hand, at a position behind the passenger compartment, a front rear cross member 7 that connects the rear portions 5b, 5b of the side frames 5, 5 on the front side thereof is provided so as to extend in the vehicle width direction. Further, a tunnel top rain reinforcement 8 as a tunnel rain reinforcement that forms a closed section in cooperation with the tunnel portion 4 is provided on the tunnel portion 4 so as to extend in the vehicle front-rear direction. The front end of the tunnel top rain reinforcement 8 is centered in the vehicle width direction of the dash cross member 6, and the rear end side is centered in the vehicle width direction of the rear cross member 7 via the tunnel top rear rain reinforcement 8a. Each is connected.

  Specifically, as shown in FIG. 4, the dash panel 3 has a floor portion that extends horizontally toward the front side in the vicinity of the front end of the passenger compartment floor surface, and extends obliquely upward from the floor portion toward the front side. It consists of an inclined portion and a vertical wall portion extending substantially upward from the inclined portion, and is joined to the front end of the floor panel 1 at the rear end of the floor portion, while the upper end flange 3a is formed of the vertical wall portion. It is provided in the upper end and is formed in the shape bent toward the front side. The tunnel portion 4 extends from the floor panel 1 to the floor portion and the inclined portion of the dash panel 3, and is, for example, a reverse inverted concave section opened downward using a panel member different from the floor panel 1 and the dash panel 3. It is provided in the shape. At that time, the cross-sectional shape of the front end side of the tunnel portion 4 is increased, and the latter half portion of the engine E is arranged inside the tunnel portion 4. As shown in FIG. 2, the tunnel top rain reinforcement 8 has a reverse concave shape that is open downward and covers the top wall of the tunnel portion 4 from above. Since the lower ends of both side walls are joined to the upper ends of both side walls of the tunnel portion 4, a closed cross section is formed in cooperation with the upper surface wall of the tunnel portion 4. That is, in this embodiment, the rain reinforcement 8 is arranged on the tunnel portion 4 to form a so-called high-mount backbone frame structure.

  As shown in FIG. 20, the vehicle according to the present embodiment is an FR vehicle that drives the rear wheels with an engine E mounted vertically on the front side. The engine E is equipped with a rotary engine. Utilizing the fact that the engine is smaller than the reciprocating engine, the engine E is moved from the engine room to the front end side in the tunnel part 4 to make a midship, thereby reducing the yaw moment of inertia of the entire vehicle. . A propeller shaft extending from a transmission connected to the engine E is disposed in the tunnel portion 4. At that time, the oil pan is made shallower by using the dry engine as a lubrication device for the rotary engine E, so that the arrangement thereof is lowered to lower the center of gravity of the entire vehicle.

  The side frames 5 and 5 are kicked up at positions near the front wheels 21 and the rear wheels 22, respectively, and from the front portions 5a and 5a positioned forward from the front kick-up portion and from the rear kick-up portion. The rear portions 5b and 5b located at the rear extend straight in the horizontal direction. A pair of side sills 19, 19 provided so as to extend in the vehicle front-rear direction are disposed on both side edges of the floor panel 1, and the front and rear ends of each side sill 19 are attached to each side frame 5. Are combined. 1 is a center cross member that is provided on the floor panel 1 so as to extend in the vehicle width direction and connects the side sills 19 and 19, the side frames 5 and 5, and the tunnel top rain reinforcement 8. .

  As shown in FIGS. 5 to 7, each of the dash cross members 6 is disposed on the engine room side of the dash panel 3 and is connected to each side frame 5, and a pair of outdoor members 6 a on both sides. , 6a and an indoor side member 6b which is disposed on the dash panel 3 and is connected to the outdoor side members 6a, 6a. That is, each of the outdoor members 6a is provided so as to extend in an arc shape along the side wall of the tunnel portion 4 toward the upper center, and the portion facing the dash panel 3 is directed rearward and the side frame 5 The part facing the base end of the front part 5a has a shape opened downward. A flange joined to the vertical wall portion of the dash panel 3 and a flange joined to the base end of the front portion 5a are both formed outward at the periphery. Moreover, the part joined to the inner wall surface of the front-end opening of the tunnel part 4 does not bend, but has a substantially straight cross-sectional shape.

  On the other hand, the indoor side member 6b has a casing shape in which both the front surface side and the lower surface side are open, and an outward flange is provided around the periphery thereof. As shown in FIG. 8, the front surface side is joined to the vertical wall portion of the dash panel 3, and the lower surface side is joined to the front end side upper surface wall of the tunnel portion 4.

  As shown in FIG. 3, the base end of the front portion 5 a of the side frame 5 has a trumpet shape in which the distance between the side walls increases toward the rear. Further, on the right side which is the driver's seat side, a through hole 23 for inserting a shaft of a steering wheel (not shown) is provided in the dash panel 3, and accordingly, at the base end of the front portion 5a, While the upper surface wall has a curved shape protruding upward, a through hole is provided in the lower surface wall. A pair of lower mounting brackets 24 and 24 for a steering wheel are provided around the through hole of the dash panel 3. In order to further increase the rigidity by the dash cross member 6, the tower of the suspension device and the dash cross member 6 may be connected via a performance rod or the like.

  The cowl box 2 has been lowered and miniaturized in order to improve the forward downward view of the automobile, and as shown in FIG. Has been lowered. On the other hand, the left and right side portions of the cowl box 2 cannot be lowered sufficiently to secure a mounting seat surface for mounting the master back 25 of the vehicle braking device, and are higher than the intermediate portion. A drain pipe 9 is provided between the middle portion of the cowl box 2 and the indoor member 6b to connect the inner bottom surface of the cowl box 2 to the indoor member 6b. Moreover, the drain hole 3b is each provided in the dash panel 3 in each connection part between the indoor side member 6b and the outdoor side member 6a.

  Below the cowl box 2, as shown in FIG. 2, a heater unit 26, a cooler unit 27, and a blower 28 of a vehicle air conditioner are provided from an intermediate part in the vehicle width direction to a passenger seat side (right side in the figure). Are arranged in order. The blower 28 is arranged in a state where the suction port 28a faces the inside of the cowl box 2 through a substantially rectangular opening 2a provided on the bottom wall of the cowl box 2. Specifically, as shown in FIGS. 9 and 10, the cowl box 2 has a rectangular tube shape having a cross-sectional shape that follows the shape of the opening 2a and is open at both upper and lower ends. The tower 29 is disposed in a state where it is joined to the periphery of the opening 2a. The tower 29 has an outward flange 29a at the lower end opening edge, and is joined to the bottom wall of the cowl box 2 at the outward flange 29a. Further, the portion near the upper end of the tower 29 has a smaller cross-sectional shape than the portion on the lower end side, and the connecting portion between the two is a substantially horizontal stepped portion 29b. And the part from this step part 29b to an upper end is made into the baffle part 29c which makes substantially the same cross-sectional shape. That is, the blower 28 is arranged so that the peripheral edge of the suction port 28a is joined to the stepped portion 29b in an airtight state from below, and the suction port 28a faces the baffle portion 29c. In other words, the tower 29 serves as both a mounting bracket for the blower 28 and a baffle. Accordingly, as shown in FIG. 12, as compared with the case where the dedicated baffle member b is used and the blower 28 'is positioned at the position of the bottom wall of the cowl box 2', the blower 28 'is positioned as shown in FIG. As shown in FIG. 4, since it can be disposed at a position higher than that, the foot space h ′ formed below the blower 28 ′ in the above case despite the fact that the position of the cowl box 2 is lowered. As compared with the above, a sufficient foot space h (> h ′) can be secured.

  On the other hand, in the driver seat side portion of the dash panel 3 (right side portion in FIG. 2), the master back 25 is attached to the engine room side as described above. As shown in FIGS. 13 and 14, the wheel house 30 of the right front wheel 21 is approaching behind the master back 25. The portion of the wheel house 30 located behind the master back 25 is removable so that a space for removing the master back 25 can be secured. That is, an opening 30 a is provided in a part of the wheel house 30, and a plurality of bolts 31, 31,... Are embedded and fixed in a state in which the shaft portion protrudes from the wheel house 30. A lid member 32 having bolt insertion holes 32a, 32a,... Through which the bolt shaft portions can be inserted is arranged with respect to the opening 30a, and the bolts 31 are inserted into the insertion holes 32a. A lid member 32 is placed on 30 a and a nut 33 is screwed onto each bolt 31. As a result, the front wheel house 30 can be brought closer to the dash panel 3 without interfering with the attachment / detachment of the master back 25, so that the wheel base is shortened by that much and the yaw moment of inertia of the automobile is reduced. Can be achieved.

  When the lid member 32 is provided, as shown in FIG. 15, the connecting flange portion 32b to the dash panel 3 is formed by extending horizontally from the opening position of the wheel house 30 to the rear, If the joining flange portion 32c to the side surface of the apron rain reinforcement 63 is formed at the edge in the width direction, the rigidity of the dash panel 3 can be further increased. Further, when the spring rate of the damper of the suspension device is variable, the lid member may be configured by the adjustment box. That is, as shown in FIG. 16, mounting pieces 35, 35,... Project around the adjustment box 34, and bolt insertion holes 32 a are provided in the mounting pieces 35. As a result, the adjustment of the spring rate, which is generally performed by removing the tire in the past, can be performed on the engine room side.

  A footrest 36 is formed at the foot portion of the dash panel 3 on the driver's seat side with the side wall of the tunnel portion 4 bulging sideways. On the other hand, on the front end side of the tunnel portion 4, a rear half portion of the engine E of the automobile, a clutch device connected to the rear end portion of the engine E, and a transmission device connected to the rear end portion of the clutch device, Is arranged. In the tunnel portion 4, an intake manifold 37 of the engine E is disposed using the bulging portion of the footrest 36. Accordingly, as shown in FIGS. 17 and 18, a part of the footrest 36 is cut away to provide a service hole 38 for the intake manifold. Further, a lid member 39 for closing the service hole 38 in a detachable manner is provided in accordance with the notch shape. The lid member 39 is attached to the footrest 36 and the tunnel portion 4 with bolts 40, 40,. At this time, as shown in FIG. 19, the mounting direction of each bolt 40 with respect to the footrest 36 may be aligned in the vehicle front-rear direction.

  As shown in FIGS. 20 to 22, the front harness 41 connected to the engine E is routed rearward and passes through the through hole 43 on the side wall of the tunnel portion 4 from the rear side of the starter 42. It is pulled out inside. A computer box 44 for controlling the engine E is disposed on the floor in front of the passenger seat, and the front harness 41 is connected to the computer box 44. Accordingly, the front harness 41 can be wired without being drawn out to the engine room side. The computer box 44 may be disposed at the foot of the passenger seat.

  Next, the rear side of the lower body structure will be described. As shown in FIG. 1, the rear side of the front rear cross member 7 is provided on the rear side so as to extend in the vehicle width direction, and both ends are connected to the rear portion 5 b of each front side frame 5. A rear cross member 11 is disposed. The front and rear rear cross members 7 and 11 are provided so as to extend obliquely in the horizontal direction with respect to the vehicle front-rear direction, and the front end is between the front rear cross member 7 and the tunnel top rear rain reinforcement 8a. A pair of diagonal members 10, 10 whose rear ends are coupled to the rear portions 5b of the respective side frames 5 are disposed while being coupled to the coupling portion. And as shown in FIG. 23, the fuel tank T is arrange | positioned above these diagonal members 10 and 10. As shown in FIG.

  Around the fuel tank T, two front and rear upper cross members 12 and 13 are further arranged. That is, it is provided on the front rear cross member 7 so as to be inclined obliquely upward toward the rear side, and the lower end is coupled to the joint between the front rear cross member 7 and the tunnel top rear rain reinforcement 8a. A diagonal tower 14 is disposed as a tower, and the front upper cross member 12 is coupled to the upper end of the diagonal tower 14 at the center in the vehicle width direction. The rear rear cross member 11 is provided so as to extend upward from both sides in the vehicle width direction so as to be close to each other, and the lower ends thereof are the rear rear cross member 11 and the side frame. A pair of tank cross members 15, 15 that are coupled to a coupling portion between the rear portions 5 b and whose upper ends are coupled to each other are disposed, and the rear ends of the tank cross members 15, 15 are arranged at the upper ends of the tank cross members 15, 15. The side rear cross member 11 is coupled at the center in the vehicle width direction. The front and rear upper cross members 12 and 13 are provided so as to extend obliquely in the horizontal direction with respect to the front and rear direction of the vehicle, and the front ends are coupled between the front upper cross member 12 and the diagonal tower 14. A pair of upper diagonal members 16, 16 whose rear ends are coupled to both ends of the rear upper rear cross member 13 are disposed. Among the above, the diagonal tower 14 uses the empty space between the front rear cross member 7 and the front upper rear cross member 12, and the tank cross members 15 and 15 include the rear rear cross member 11 and the rear upper rear member. They are arranged using the empty space between the cross members 13.

  Further, the front and rear upper cross members 12 and 13, diagonal tower 14, upper diagonal members 16 and 16, and tank cross members 15 and 15 are bottomed cylinders whose lower ends are opened as schematically shown in FIG. And is covered with a bulkhead panel 46 having a shape in which outward flanges are formed on both side edges of the open end. The flange is in contact with the upper surface of the side frame, and its tip is connected to the tire house 47 as shown from the rear side in the case of the right rear wheel in FIG. A tire house rain reinforcement 48 is disposed on the tire house 47. As shown in FIG. 25, the tire house rain reinforcement 48 has a wide vertical wall portion 48a extending in the vehicle front-rear direction, and a narrow width extending outward from the rear side of the vertical wall portion 48a in the vehicle width direction. The vertical wall portion 48b is connected in an L shape, and a flange 48c is formed on the periphery thereof. The lower side of the longitudinal wall portion 48a in the front-rear direction has a shape cut out in an arc shape that follows the shape of the upper surface of the tire house 47, and is joined to the tire house 47 at a flange 48c at that portion. On the other hand, the side of the vertical wall portion 48b in the vehicle width direction is joined to the quarter panel 49. The flange 48 c on the upper side of the tire house rain reinforcement 48 is joined to an auxiliary panel 46 a that is disposed horizontally from the bulkhead panel 46 toward the quarter panel 49. In FIG. 24, 60 is a trunk floor side panel placed on the upper surface of the side frame rear portion 5b in the trunk room and joined to the lower end of the quarter panel 49, and 61 is continuous to the quarter panel 49. It is a rear bumper provided in

  And the upper space of the right side frame lower part 5b on the right flange of the bulkhead panel 46 is open toward the rear trunk room 53, and as shown in FIGS. A car battery 50 is arranged. That is, when the battery 50 is taken out, it can be moved on the side frame rear portion 5b as indicated by a virtual line in FIG. On the other hand, a canister 51 for temporarily storing evaporated gas from the fuel tank T is disposed in the upper space of the left side frame lower portion 5b of the bulkhead panel 46. It should be noted that other spaces may be accommodated in these spaces, and the computer box 52 may be disposed as shown by the phantom lines in FIG. In addition, as shown in FIG. 28, the upper space of the side frame lower portion 5a may be opened also to the passenger compartment side so that a long object such as a ski board 54 can be accommodated.

  Therefore, according to the present embodiment, in the lower body structure of the automobile, the dash cross member 6 that connects the front portions 5a, 5a of the pair of side frames 5, 5 on both sides, and the rear portion of the side frames 5, 5 are provided. Since the front rear cross member 7 that connects 5b and 5b is connected by a tunnel top rain reinforcement 8 at the center position in the vehicle width direction, a high-mount backbone frame structure is formed. In addition, the torsional rigidity can be greatly improved, and it is possible to sufficiently cope with an open car.

  Further, at the time of a rear collision of the automobile, the collision load is applied not only to the pair of side frames 5 and 5 on both sides but also to the tunnel top rain via the diagonal members 10 and 10 and the front rear cross member 7 as shown in FIG. Since it can be input also to the hosement 8, the collision load can be efficiently dispersed, and the performance against the rear collision can be improved accordingly. On the other hand, since the collision load at the time of a frontal collision of the automobile can be distributed and inputted to the side frames 5 and 5 and the tunnel top rain reinforcement 8, respectively, the performance against the frontal collision can be improved. In the figure, reference numeral 18 denotes a front cross member.

  At that time, in the rear part of the lower body structure, the front and rear two rear cross members 7 and 11 and the diagonal members 10 and 10 between the two cross members 7 and 11 are connected to a diagonal tower 14 and a pair of tank crosses on both sides. The members 15 and 15 and the upper diagonal members 16 and 16 for connecting the tower 14 and the tank cross members 15 and 15 at the upper position of the diagonal members 10 and 10 are added to form a strong frame structure. Therefore, the bending rigidity of the rear part can be greatly improved, and therefore the bending rigidity of the entire lower body structure can be improved. Further, since the tank cross members 15 and 15 and the upper diagonal members 16 and 16 are obliquely coupled to the cross members 7, 11, 12 and 13, the frame structure can exhibit excellent torsional rigidity, Therefore, it is possible to contribute to improvement of torsional rigidity as the entire lower body structure. Furthermore, since the fuel tank T is surrounded by the above-mentioned members, damage to the fuel tank T at the time of a rear collision of the automobile can be greatly suppressed.

  Further, the dash cross member 6 is disposed on a pair of outdoor members 6a, 6a on both sides of the dash panel 3 on the engine room side and on the vehicle compartment side of the dash panel 3, and the engine room side member Since it is configured by the indoor side members that connect each other, the bottom wall of the cowl box 2 and the upper end of the dash panel 3 are not disturbed by the dash cross member 6 and are shown by phantom lines in FIG. The flange 3a can be spot welded from the engine room side.

  Further, since the drain pipe 9 is provided between the center portion in the vehicle width direction of the cowl box 2 and the indoor side member 6b of the dash cross member 6, the cowl box can be used to improve the forward downward view of the automobile. The center part of the cowl box 2 can be made low, ensuring the good drainage from 2.

1 is a perspective view schematically showing a lower body structure of an automobile according to an embodiment of the present invention. It is a front view which shows the principal part of a vehicle room front end part with the cross-section of a tunnel part and a tunnel top rain reinforcement. It is a disassembled perspective view which shows the front part base end of a side frame. It is a perspective view which shows the front-end vicinity part of a tunnel part. It is a disassembled perspective view which shows the principal part of a dash cross member. It is a cross-sectional top view which shows the principal part of a dash cross member. It is the VII-VII sectional view taken on the line of FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is the IX-IX sectional view taken on the line of FIG. It is a perspective view which shows the tower for blowers. It is a side view which shows typically the height position of the cowl box in a driver's seat side and a passenger seat side. It is a side view which shows typically foot space under the blower by the conventional blower attachment structure. It is sectional drawing which shows the state by which the master back is attached to the back surface of a dash panel. It is sectional drawing which shows the state which removes a master bag. It is a cross-sectional top view which shows the modification of the cover member for master back removal. It is a perspective view which shows another modification of a cover member. It is a perspective view which shows the state by which the service hole of the footrest was closed with the cover member. It is a perspective view which shows the state by which the service hole was opened. FIG. 18 is a view corresponding to FIG. 17 illustrating a modification of the service hole cover member. It is a top view which shows roughly the handling state of an engine harness with the arrangement | positioning of a computer box. It is a side view which shows arrangement | positioning of a computer box. It is the XXII-XXII sectional view taken on the line of FIG. It is a side view which shows typically the lower body structure around a fuel tank. It is a front view which shows the tire house circumference of a right rear wheel from the rear side. It is a perspective view which shows a tire house rain reinforcement. It is a front view which shows typically the circumference of a fuel tank from the rear side. It is a side view which shows the accommodation state of a battery typically. It is a side view which shows typically the accommodation state of the ski as a long thing. It is a top view which shows typically dispersion | distribution of the collision input at the time of front and rear collision.

Explanation of symbols

1 floor panel 2 cowl box 3 dash panel 3a top flange (top)
4 Tunnel part 5 Side frame 5a Front part 5b Rear part 6a Outdoor member (member)
7 Front rear cross member (front rear connecting member)
8 tunnel top rain reinforcement (tunnel rain reinforcement)
10 Diagonal member 11 Rear rear cross member 18 Front cross member

Claims (4)

A floor panel provided so as to form a floor surface of a passenger compartment, a cowl box provided so as to extend in the vehicle width direction at a position above the front end of the vehicle front-rear direction of the floor panel, and the floor panel and the cowl box A dash panel provided so as to be connected to each other and having an upper end joined to the cowl box, and provided to protrude upward on the floor panel so as to extend rearward from the center in the vehicle width direction of the dash panel. A lower body structure of an automobile including a tunnel portion and a pair of side frames provided on both sides so as to extend in the vehicle longitudinal direction and to be arranged in the vehicle width direction,
The side frame is disposed in front of the passenger compartment at a position higher than the floor panel so as to extend in the vehicle front-rear direction and an intermediate portion disposed so as to extend in the vehicle front-rear direction along the floor panel. And a rear portion arranged to extend in the vehicle front-rear direction at a position higher than the floor panel behind the passenger compartment,
A pair of members that form a closed cross-section in cooperation with the dash panel and each end is connected to the front portion of the side frame;
A front rear connecting member that is provided so as to extend in the vehicle width direction and connects the rear portions of the both side frames;
A rear rear cross member that is provided so as to extend in the vehicle width direction at a position spaced rearward from the front rear connection member, and connects the rear portions of the side frames;
A tunnel rain reinforcement that is provided so as to extend in the vehicle front-rear direction along the tunnel portion, and that forms a closed cross-section at a position spaced above the intermediate portion of the side frame in cooperation with the tunnel portion. ,
The front end side of the tunnel rain hose is connected to each other end of the pair of members, while the rear end side is connected to the center in the vehicle width direction of the front rear connection member , and the tunnel rain hose The lower body structure of an automobile, wherein an upper portion of a rear end portion of the vehicle is connected to the front rear connecting member at substantially the same height . The lower body structure of an automobile according to claim 1,
A lower vehicle body structure for an automobile, comprising a front cross member that is provided so as to extend in the vehicle width direction at a position spaced forward from the dash cross member, and that connects the front portions of the side frames. . The lower body structure of an automobile according to claim 1 or 2,
A lower body structure of an automobile, wherein a rear end side of the tunnel rain reinforcement and the rear rear cross member are connected by a member. A floor panel provided so as to form a floor surface of a passenger compartment, a cowl box provided so as to extend in the vehicle width direction at a position above the front end of the vehicle front-rear direction of the floor panel, and the floor panel and the cowl box A dash panel provided so as to be connected to each other and having an upper end joined to the cowl box, and provided to protrude upward on the floor panel so as to extend rearward from the center in the vehicle width direction of the dash panel. A lower body structure of an automobile including a tunnel portion and a pair of side frames provided on both sides so as to extend in the vehicle longitudinal direction and to be arranged in the vehicle width direction,
The side frame is disposed in front of the passenger compartment at a position higher than the floor panel so as to extend in the vehicle front-rear direction and an intermediate portion disposed so as to extend in the vehicle front-rear direction along the floor panel. And a rear portion arranged to extend in the vehicle front-rear direction at a position higher than the floor panel behind the passenger compartment,
A dash cross member that forms a closed cross-section in cooperation with the dash panel and has one end connected to the front portion of the side frame;
A tunnel rain reinforcement that is provided so as to extend in the vehicle front-rear direction along the tunnel portion, and forms a closed cross-section at a position spaced above the intermediate portion of the side frame in cooperation with the tunnel portion;
A diagonal member extending from the rear end side of the tunnel rain reinforcement outward in the vehicle width direction and toward the rear,
A front end side of the tunnel rain reinforcement is connected to the other end of the dash cross member, while a rear end side is connected to the rear portions of the both side frames by the diagonal member . A lower body structure of an automobile, wherein an upper portion of a rear end portion and the diagonal member are configured to be connected at substantially the same height .

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