JP2010012898A - Automobile floor structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automobile floor structure that satisfies cost and lightweight requirements and that is converted to a low-floor type while sufficiently increases rigidity of the lower part of the cabin. <P>SOLUTION: The lower part of a cabin includes: a floor panel 50; floor frames 41, 42 extending in the front and rear directions; and cross members 31-33 extending in the axle, the cross members being on the floor frames 41, 32. The floor frames 41, 42 are formed into a tubular-shape and its upper surface forms a floor surface becoming an even single surface together with the floor panel 50, the floor frames being connected to the floor panel 50 so as to protrude downward the floor panel 50. The cross members 31-33 are disposed protruding upward the floor panel 50 and connected directly to the floor frame 41, 42. The cross members 31-33 are also formed into a tubular-shape. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an automobile floor structure.

  In an automobile, a floor panel is provided at the lower part of a passenger compartment, and a floor frame extending in the front-rear direction is joined to the lower surface of the floor panel, and a cross member extending in the vehicle width direction is joined to the upper surface of the floor panel. And both a floor frame and a cross member are formed in the cross-sectional hat shape which has a flange part, and the closed cross section is comprised in cooperation with a floor panel. Such a floor frame and cross member ensure the rigidity of the lower part of the passenger compartment.

  In Patent Document 1, a plurality of engagement side portions are formed in the floor frame so as to protrude upwardly at intervals in the front-rear direction, while a plurality of slits for engaging the engagement side portions are formed on the floor panel. And what raised the joint strength of a floor panel and a floor frame is indicated. However, the thing of this patent document 1 is a thing which is not disclosed about the cross member.

In Patent Document 2, a lower floor frame having a cross-sectional hat shape that extends in the front-rear direction is joined to the lower surface of the floor panel, and a cross-hat-shaped cross member that extends in the vehicle width direction is joined to the upper surface of the floor panel. A structure is disclosed in which an upper floor frame having a cross-sectional hat shape extending in the front-rear direction is joined to the upper surface of the panel, and the floor panel is sandwiched between the upper and lower floor frames.
Japanese Patent Laid-Open No. 11-208525 Japanese Utility Model Publication No. 61-058173

  By the way, it is desired that the lower part of the passenger compartment having the floor panel, the floor frame, and the cross member should be further reduced in weight for the purpose of improving safety and improving the fuel efficiency. For this reason, it is conceivable that the floor panel and the cross member as a vehicle body strength member as well as the floor panel are formed of a high-tensile steel plate. In this case, not only the cost is increased, but also the rigidity improvement is sufficiently satisfied. It's not going to be anything. In addition, in the thing of patent document 1, only the joint strength of a floor frame and a floor panel is improved, and since there is no cross member, it is possible to sufficiently improve the rigidity of the lower part of the passenger compartment. Impossible. Moreover, in the thing of patent document 2, the number of parts, cost, and weight will increase by the amount of providing the upper floor frame separately, and unevenness by the upper floor frame is formed on the upper surface of the floor. In addition to being unusable, it is not preferable in terms of lowering the floor.

  The present invention has been made in consideration of the above circumstances, and its purpose is to be able to lower the floor while sufficiently satisfying the cost and weight reduction and to sufficiently improve the rigidity of the lower part of the passenger compartment. It is to provide an automobile floor structure.

In order to achieve the above object, the following solution is adopted in the present invention. That is, as described in claim 1 in the claims,
A vehicle floor structure comprising a floor panel, a floor frame extending in the front-rear direction, and a cross member extending in the vehicle width direction on the floor frame at the lower part of the passenger compartment,
The floor frame is formed in a pipe shape, and the upper surface of the floor frame constitutes a floor surface substantially flush with the floor panel, and is joined to the floor panel so as to protrude downward from the floor panel,
The cross member is disposed so as to protrude above the floor panel and is directly joined to the floor frame.
It is like that.

  According to the above solution, the floor frame is made into a pipe with extremely high rigidity, and the floor frame as the vehicle body strength member and the cross member are directly joined together. It can be improved dramatically. In particular, the floor frame that extends in the front-rear direction and the cross member that extends in the vehicle width direction are directly joined to disperse the load in the front-rear direction and the load in the vehicle width direction in the event of a collision in both the front-rear and left-right directions. In addition, it is preferable for dealing with a collision from the side. Further, since the upper surface of the floor frame forms a part of the floor panel by directly joining the floor frame and the cross member, the floor can be lowered by the thickness of the floor panel. Of course, the floor frame protrudes from the lower surface of the floor panel, and the cross member protrudes from the upper surface of the floor panel. Therefore, the lower part of the passenger compartment can be constructed without requiring a significant design change. it can.

A preferred mode based on the above solution is as described in claim 2 and the following claims. That is,
The floor frame has an upper surface formed thinner than other surfaces (corresponding to claim 2). In this case, the upper surface of the floor frame can be thinned to further reduce the weight. In addition, since the cross member is directly joined to the upper surface of the floor frame, the floor frame is difficult to bend upward with respect to the front impact load, so there is no problem in securing rigidity even if the upper surface of the floor frame is thin. Is.

  The cross member is formed in a pipe shape whose lower surface is thinner than other surfaces (corresponding to claim 3). In this case, it is possible to improve the rigidity of the cross member while reducing the weight, which is more preferable in terms of reducing the weight and improving the rigidity of the lower part of the passenger compartment. Further, the weight of the cross member can be reduced by making the lower surface of the cross member thin. In addition, since the cross member is directly joined to the upper surface of the floor frame, the cross member is difficult to bend upward due to a side impact load, so there is no problem in securing rigidity even if the lower surface of the cross member is thin. Is.

The floor panel is bonded to an edge of one of the upper surface of the floor frame or the lower surface of the cross member,
The floor panel has a notch formed at a position corresponding to the intermediate portion in the width direction of the one surface.
The floor panel is bonded to a side surface of the other member that is a member having the other surface with respect to the one surface of the floor frame and the cross member.
(Corresponding to claim 4). In this case, the floor panel can be positioned from above or from below, and can be joined to the floor frame and the cross member, which facilitates manufacture. Moreover, the weight reduction can be achieved by making the part which becomes useless on the rigidity of a floor panel into a notch part. In addition, it becomes possible to divide the floor panel with the middle part of one side as a boundary. In the case of the divided structure, it is not necessary to form the floor panel with a single large plate and handle it. This is also preferable in terms of facilitation, optimization of rigidity and strength, and the like.

  The floor frame and the cross member are each formed by hydroforming a pipe material made of a steel plate having a higher tension than the steel plate constituting the floor panel (corresponding to claim 5). . In this case, it is possible to easily form the floor frame and the cross member itself while sufficiently increasing the rigidity. Further, a strong frame structure can be formed without using an expensive high-tensile steel plate for a floor panel having a small rigidity improvement effect.

  A plurality of the floor frames are provided at intervals in the vehicle width direction (corresponding to claim 6). In this case, the strength members are arranged in a lattice pattern by the plurality of floor frames and the cross members intersecting the floor frames, so that the rigidity is maintained while reducing the cross-sectional area per floor frame. The floor can be lowered.

In the lower part of the passenger compartment, in the middle part in the vehicle width direction, it has a tunnel part that extends in the front-rear direction,
With a pair of left and right side sills extending in the front-rear direction across the tunnel portion,
The floor frame is provided with at least a pair of left and right across the tunnel portion,
The cross member is formed in a pipe shape across the entire length between the pair of left and right side sills while connecting the pair of left and right side sills across the tunnel portion.
The floor panel is divided into one central panel member constituting the tunnel portion in the vehicle width direction and a pair of left and right outer panel members sandwiching the central panel member,
Each opposing edge of the panel member adjacent in the vehicle width direction is joined to the upper surface of the floor frame in a state of being placed on the upper surface of the floor frame,
(Corresponding to claim 7). In this case, while adopting the same structure as the general lower part of the passenger compartment having the tunnel part, the cross member exists in the shape of a pipe over the entire length between the pair of left and right side sills. This is preferable for further improving the overall rigidity of the lower part of the passenger compartment. In addition, the floor panel, which has been a very large member in the past, is divided into a plurality of divided structures in the vehicle width direction, so that its manufacture and handling are facilitated. Further, since the center panel member and the outer panel member can be adjusted in the vehicle width direction within the range of the width dimension of the floor frame (since dimensional tolerance can be absorbed), the manufacturing can be further facilitated. Is preferable.

The floor frame includes two inner floor frames near the tunnel portion and an outer floor frame near the side sill between the tunnel portion and the left side sill and between the tunnel portion and the right side sill. One by one,
A plurality of the cross members are provided at intervals in the vehicle width direction,
The floor panel is divided into the central panel member and the outer panel member in the pair of left and right inner floor frames,
The outer panel member has the notch in the outer floor frame portion, and an opening edge of the notch is joined to the upper surface of the outer floor frame.
This is done (corresponding to claim 8). In this case, the dimension of the center panel member having a complicated shape is preferably made as small as possible in order to facilitate its manufacture. Moreover, a notch part is formed in the position corresponding to an outer floor frame among floor panels, and it becomes still more preferable on weight reduction. Further, the strength members are arranged in a lattice pattern by the plurality of floor frames and the plurality of cross members intersecting with the floor frames, so that the rigidity is maintained while the sectional area per floor frame is reduced. Further, the floor can be lowered. In addition, the floor panel support is increased, and the floor panel can be made thinner and lighter.

  According to the present invention, the cost and weight reduction can be sufficiently satisfied, the floor can be lowered, and the rigidity of the lower part of the passenger compartment can be sufficiently improved.

  FIG. 1 shows a skeleton portion of an automobile to which the present invention is applied. In FIG. 1, only the right side portion is shown, but it is formed in a bilaterally symmetric structure. In the figure, reference numeral 1 denotes a front pillar (the lower portion of the front pillar 1 is sometimes referred to as a hinge pillar). From the front end of the front pillar 1, the apron reinforcement 2 is located at a height near the belt line. It extends toward the front. A front side frame 3 extends forward from the vicinity of the lower end of the front pillar 1. The apron reinforcement 2 is connected in the vicinity of the front pillar 1 by a suspension support member 4 to which a suspension damper (not shown) is attached. The suspension support member 4 and the front side frame 3 are connected by a front wheel main body housing (not shown).

  The rear end of the front side frame 3 is connected to a strength member 5 extending in the vehicle width direction, and is connected to the lower end of the front pillar 1 directly or via a torque box. The pair of left and right front pillars 1 are connected by a steering handle support member 6 extending in the vehicle width direction at a position slightly lower than the belt line. The rear end portions of the pair of left and right suspension support members 4 are connected by a reinforcement 7 having a closed cross section extending in the vehicle width direction. Further, the vicinity of the lower ends of the pair of left and right front pillars 1 is reinforced by a reinforcement 8 having a closed cross section extending in the vehicle width direction. The reinforcement 8 is disposed so as to straddle a tunnel portion extending in the front-rear direction, which is configured in a passenger compartment floor portion described later.

  A front end portion of a side sill 10 as a strength member having a closed cross section extending in the front-rear direction is connected to the lower end portion of the front pillar 1. Further, a front end portion of a roof side rail 11 having a closed cross section extending in the front-rear direction is connected to the upper end portion of the front pillar 1. The rear end portion of the side sill 10 is connected to the front end portion of the strength member 12 having a closed cross-sectional shape that extends while tilting upward and rearward and then extending rearward. A rear side frame 13 having a closed cross section extending in the front-rear direction is disposed on the inner side in the vehicle width direction of the strength member 12. A front end portion of the rear side frame 13 is connected to a rear end portion of the side sill 10 via a connecting member 14.

  The side sill 10 and the roof side rail 11 are connected by a center pillar 21. Further, the strength member 12 and the roof side rail 11 are connected by a connecting member 22. Further, the strength member 12 and the rear side frame 13 are connected by the connecting member 23 and are connected to each other at the rear of the connecting member 23.

  The pair of left and right side sills 10 are connected by cross members 31, 32, 33 extending in the vehicle width direction. In the front-rear direction position, the cross member 31 is positioned between the front pillar 1 and the center pillar 21, the cross member 32 is positioned at the center pillar 1, and the cross member 33 is positioned near the front end of the strength member 12. The front end of the rear side frame 13 is connected to the lower surface of the cross member 33.

  The pair of left and right rear side frames 13 are connected by cross members 34 and 35. The rear ends of the pair of left and right strength members 12 are connected by a cross member 36. The cross member 36 and the rear end portion of the rear side frame 13 are connected by a connecting member 24.

  A side opening S1 between the front pillar 1 and the center pillar 21 serves as a front opening / alighting opening. Further, the side opening S2 between the center pillar 21 and the strength member 12 serves as a rear seat entrance / exit opening. The front space from the cross member 34 is used as a passenger compartment, while the rear space is used as a cargo compartment. In the embodiment, the space is set as a cargo compartment for a wagon vehicle.

  In FIG. 1, reference numerals 41 and 42 denote floor frames extending in the front-rear direction. The floor frames 41 and 42 are spaced apart from each other in the vehicle width direction, 41 is an inner floor frame positioned on the inner side in the vehicle width direction, and 42 is an outer floor frame positioned on the outer side in the vehicle width direction. The Each of the floor frames 41 and 42 is provided as a pair on the left and right with a tunnel portion described later as a boundary (a total of four).

  The inner floor frame 41 has a front end connected to the strength member 5 and a rear end connected to the lower surface of the cross member 33. The outer floor frame 42 has a front end connected to the strength member 5 and a rear end connected to the front end of the rear side frame 13.

  At least the cross members 31 to 33 and the floor frames 41 and 42 serving as the above-described strength members are each formed in a pipe shape from a high-tensile steel plate. More specifically, a pipe material made of a high-strength steel plate is formed to have a predetermined cross-sectional shape by hydroforming. In the embodiment, the side sill 10 is also formed by hydroforming a pipe material made of a high-tensile steel plate. Of course, the high-tensile steel plates constituting the floor frames 41 and 42 and the cross members 31 to 33 have higher tension than the steel plates constituting the floor panel.

  The floor frames 41 and 42 are joined to the lower surfaces of the cross members 31 to 33 as described later. A total of four floor frames 41 and 42 extending in the front-rear direction and a total of three cross members 31 to 33 extending in the vehicle width direction form a lattice-like structure of strength members so that the rigidity of the lower portion of the vehicle compartment is increased. There has been a dramatic improvement. Moreover, since the floor frames 41 and 42 and the cross members 31 to 33 are formed in a pipe shape with high-tensile steel plates, they are preferable in terms of weight reduction while improving rigidity.

  Here, the joint between the floor frames 41 and 42 and the cross members 31 to 33 will be described in detail with reference to FIG. 2 to FIG. 5, but FIG. FIG. 3 is a perspective view of the connecting portion as viewed from below, FIG. 4 is a cross-sectional view corresponding to line X4-X4 of FIG. 3, and FIG. 5 is a plan view of the connecting portion as viewed from above. In addition, since the joining of the cross members 31 to 33 to the floor frames 41 and 42 is performed in the same manner, the joining of the cross member 32 will be described as an example.

  First, the cross members 31 to 33 are placed on the upper surfaces of the floor frames 41 and 42, and are joined (continuously welded in the embodiment) at four front and rear and right and left total positions formed at the intersections. That is, as shown in FIG. 2, at the position where the cross member 32 overlaps with the floor frames 41, 42, two front and rear portions which are lower side surfaces of the cross member 32 are joined to the upper surface of the floor frames 41, 42. The location is indicated by the symbol α. In FIG. 2, only the front joining portion α is shown, but the joining portion α is also formed on the lower rear surface of the cross member 32.

  On the other hand, on the lower surface side of the cross member 32, as shown in FIGS. 3 and 4, the upper portions of the side surfaces of the floor frames 41 and 42 are joined to the lower surface of the cross member 32 at the joint location β. In FIG. 3, only the joint part β on the inner side in the vehicle width direction is shown, but the joint part β is also formed on the upper side surface of the floor frames 41 and 42 on the outer side in the vehicle width direction. FIG. 7 shows a state when such a joint portion β and the joint portion α are viewed from above the cross member 32.

  Here, as shown in FIG. 4, the upper surfaces of the floor frames 41 and 42 are thinner than the other surfaces. In order to form only the upper surface in this way, for example, a thin high-tensile steel plate is used in advance as a portion corresponding to the upper surface by, for example, a tailored blank, and a portion constituting the other surface is formed by a thick high-tensile steel plate. The formed pipe material may be formed and then formed into a desired cross-sectional shape by, for example, hydroforming. Similarly, the lower surface of the cross member 32 is also formed thinner than the other surfaces. Such a cross member 32 can be formed by using the method for forming the floor frames 41 and 42 described above. Since the floor frames 41 and 42 and the cross member 32 are directly joined in a state where they overlap each other, they are difficult to bend upward, and the abutting surfaces are made thin as described above. However, there is no problem in securing bending rigidity.

  Next, a state in which the floor panel is attached to the skeleton structure of the vehicle body shown in FIG. 1 will be described with reference to FIGS. 2 to 9. FIGS. 6 and 7 show a floor frame, a cross member, and a floor, respectively. FIG. 8 is a partially sectional perspective view showing a joining structure with a panel, FIG. 8 is a partially sectional simplified perspective view showing this joining structure, and FIG. 9 is an exploded perspective view of FIG.

  First, the floor panel is indicated by reference numeral 50. The floor panel 50 is divided into three parts in the vehicle width direction and three parts in the front-rear direction, and is configured by nine divided panel members in total. That is, between the cross members 32 and 33, in the vehicle width direction, as shown in FIGS. 8 and 9, in particular, the center panel constituting the tunnel portion T that extends in the front-rear direction and protrudes upwards. The rear portion of the floor panel 50 is configured by the member 61A and a pair of left and right outer panel members 61B positioned on the outer side in the vehicle width direction. Similarly, between the cross members 32 and 31, a center panel member 62A and a pair of left and right outer panel members 62B located on the outer side in the vehicle width form an intermediate portion in the front-rear direction of the floor panel 50. . Similarly, the front portion of the floor panel 50 is located in front of the cross member 31 by a center panel member (not shown) and a pair of left and right outer panel members 63B (see FIG. 6) positioned on the outer side in the vehicle width direction. It is configured.

  The outer edge in the vehicle width direction of the central panel member 61A disposed between the cross members 32 and 33 is the edge on the inner side in the vehicle width direction (close to the tunnel portion T) of the upper surface of the inner floor frame 41. (The bonding may be any of spot welding, continuous welding, and adhesion using an adhesive, and the same applies to the bonding of other portions of each panel member). Further, the center portion in the vehicle width direction of the front edge portion of the central panel member 61A is placed on and joined to the rear edge portion of the upper surface of the cross member 32 to form a substantially flat tunnel upper surface (cross). The rear surface of the member 32 may be abutted and joined. The rear edge portion of the central panel member 61 </ b> A is in contact with and joined to the front side surface of the cross member 33.

  The inner side edge in the vehicle width direction of the outer panel member 61B disposed between the cross members 32 and 33 is placed on and joined to the outer side edge in the vehicle width direction on the upper surface of the inner floor frame 41. Yes. Further, the outer edge of the outer panel member 61B in the vehicle width direction is in contact with and joined to the inner surface of the side sill 10. The front edge portion of the outer panel member 61B is in contact with and joined to the rear side surface of the cross member 32. The rear edge portion of the outer panel member 61B is in contact with and joined to the front side surface of the cross member 33.

  A portion of the outer panel member 61B located on the outer floor frame 42 is formed with a slit-like cutout portion 61a that extends in the front-rear direction, and an edge of the cutout portion 61a is formed on the upper surface of the outer floor frame 42. It is joined. The weight is reduced by the formation of the notch 61a, and the edge of the notch 61a is joined to the outer floor frame 42, thereby increasing the joining location (joining area), and the outer panel member 61b and the outer floor frame. The bonding strength with 42 is improved.

  Since the central panel member 61A and the outer panel member 61B have a small interval in the vehicle width direction on the upper surface of the inner floor frame 41 (which can also be considered as the formation of a notch), each panel member 61A A dimensional error in the vehicle width direction with 61B can be absorbed on the inner floor frame 41 (the floor panel 50 can be configured without strict dimensional tolerance).

  Note that the above-described joining structure of the three panel members 61A and 61B to the cross members 32 and 33 and the side sill 10 is the panel members 62A and 62B between the cross members 32 and 31 and the front panel of the cross member 31. Since the same applies to the member 63B and the like, the redundant description thereof is omitted.

  Here, the floor panel 50 (each panel member 61A, 61B, 62A, 62B, etc.) is substantially flush with the upper surface of the floor frames 41, 42, and the portion of the floor frames 41, 42 where the notch 61a exists. The upper surface is exposed to the vehicle interior (upward), and substantially constitutes a part of the floor panel 50. The floor frames 41 and 42 protrude below the floor panel 50, and the cross members 31 to 33 protrude above the floor panel 50, so that existing vehicles using a hat-shaped floor frame or cross member are used. The structure is similar to that of the lower part of the room, and it is not necessary to consider a significant design change of the vehicle body.

  Moreover, when performing the installation work and joining work of each panel member, such as 61A, 61B, to the vehicle body, it is possible to perform all of this work from above the floor frames 41, 42 and the cross members 31-33. Also, it is extremely preferable in terms of assembly workability.

  Here, the cross members 31 to 33 can be joined to the side sill 10 by, for example, butt welding, but it is preferable to adopt the following joining structure. That is, when focusing attention on the cross member 32, in FIG. 10 showing the joint portion of the side sill 10 and the cross member 32 in an exploded manner, the outer edge in the vehicle width direction of the cross member 32 is formed from the upper surface and front and rear side surfaces. Engagement convex sides 70a, 70b, 70c that extend outward in the vehicle width direction are integrally formed. On the other hand, slits 71a, 71b, 71c into which the engaging convex side portions 70a, 70b or 70c are fitted are formed on the side surface of the side sill 10 on the inner side in the vehicle width direction. After the engaging convex side portions 70a, 70b, 70c are inserted into the corresponding slits 71a, 71b, 71c, the outer side edge in the vehicle width direction of the cross member 32 is welded to the side surface of the side sill 10 (for example, spot welding or continuous welding). By doing so, the side sill 10 and the cross member 32 are firmly joined while absorbing the tolerance.

  FIG. 11 shows a modification of FIG. 10, and an engaging convex side part 70 d having a longer shape is provided instead of the engaging convex side part 70 a shown in FIG. 10. The engaging convex side portion 70d has a shape that abuts from the side surface on the inner side in the vehicle width direction of the side sill 10 to the upper surface when the pair of front and rear engaging convex side portions 70b and 70c are inserted into the slits 71b and 71c. It is said that. The side sill 10 and the cross member 32 are firmly joined by welding the peripheral edge portion of the engaging convex side portion 70d.

  Although the embodiment has been described above, the present invention is not limited to the embodiment, and can be appropriately changed within the scope described in the scope of claims. For example, the invention includes the following cases. . It is also possible not to provide the notch 61a. While the floor panel 50 is divided in the front-rear direction with the cross members 31 and 32 as a boundary, the floor panel 50 may be configured using a single piece in the vehicle width direction.

  The floor panel 50 may be assembled from below the floor frames 41 and 42. In this case, the cutout portion corresponding to the cutout portion 61a may be formed at a position overlapping the lower surfaces of the cross members 31 to 33, and the floor panel 50 is configured to be divided with the floor frames 41 and 42 as a boundary. preferable. The floor frames 41 and 42 may be joined to the cross members 31 to 33 (joint locations α and β) by joining only one of the upper and lower sides (only the join locations α or β). When assembling the panel 50 from above, the joint only from above is selected (selection of the joining point α), and conversely, when the floor panel 50 is assembled from below, the joint only from below is selected. It is preferable to select (selection of the joint location β).

  The bonding of the floor panel 50 (panel members 61A, 61B, etc.) to the floor frames 41, 42 and the cross members 31-33 may be performed using an adhesive. In this case, for example, by using a thermosetting adhesive, the adhesive can be cured by using high heat in a drying process in a subsequent painting process. Only one of the floor frames 41 and 42 may be provided (it is preferable to set the outer floor frame 42 connected to the rear side frame 13 substantially linearly). The number of cross members at the bottom of the passenger compartment can be two or four or more. It may be a sedan type automobile having a trunk rule independently of the passenger compartment, or may be an automobile having only one side opening for getting on and off in the front-rear direction, such as a coupe type. Of course, the object of the present invention is not limited to what is explicitly stated, but also implicitly includes providing what is substantially preferred or expressed as an advantage.

The perspective view which shows the right side half part of the frame structure of the motor vehicle to which this invention was applied. The perspective view which looked at the connection part of a floor frame and a cross member from upper direction. The direction perspective view which looked at the connection part of a floor frame and a cross member from the downward direction. FIG. 4 is a cross-sectional view corresponding to line X4-X4 in FIG. 3. The top view which looked at the connection part of a floor frame and a cross member from upper direction. The partial cross section perspective view which shows the joining structure of a floor frame, a cross member, and a floor panel. The partial cross-sectional perspective view which shows the joining structure of a floor frame, a cross member, and a floor panel, and abbreviate | omits a center pillar. The partial cross-section simple perspective view which shows the joining structure of a floor frame, a cross member, and a floor panel. The exploded perspective view of FIG. The principal part disassembled perspective view which shows the preferable junction structure of a cross member and a side sill. The principal part perspective view which shows the modification of FIG.

Explanation of symbols

10: Side sill 31-33: Cross member 41: Floor frame (inside)
42: Floor frame (outside)
50: Floor panel 61A, 62A: Center panel member 61B, 62B, 63B "Outer panel member α, β: Joined part T: Tunnel part

Claims (8)

A vehicle floor structure comprising a floor panel, a floor frame extending in the front-rear direction, and a cross member extending in the vehicle width direction on the floor frame at the lower part of the passenger compartment,
The floor frame is formed in a pipe shape, and the upper surface of the floor frame constitutes a floor surface substantially flush with the floor panel, and is joined to the floor panel so as to protrude downward from the floor panel,
The cross member is disposed so as to protrude above the floor panel and is directly joined to the floor frame.
An automobile floor structure characterized by that. In claim 1,
The floor structure of an automobile, wherein the floor frame has an upper surface formed thinner than other surfaces. In claim 1 or claim 2,
An automobile floor structure, wherein the cross member is formed in a pipe shape whose lower surface is thinner than other surfaces. In any one of Claims 1 thru | or 3,
The floor panel is bonded to an edge of one of the upper surface of the floor frame or the lower surface of the cross member,
The floor panel has a notch formed at a position corresponding to the intermediate portion in the width direction of the one surface.
The floor panel is bonded to a side surface of the other member that is a member having the other surface with respect to the one surface of the floor frame and the cross member.
An automobile floor structure characterized by that. In any one of Claims 1 thru | or 4,
The floor structure of an automobile, wherein the floor frame and the cross member are each formed by hydroforming a pipe material made of a steel plate having a higher tension than that of the steel plate constituting the floor panel. In any one of Claims 1 thru | or 5,
A floor structure of an automobile, wherein a plurality of the floor frames are provided at intervals in the vehicle width direction. In any one of Claims 1 thru | or 3,
In the lower part of the passenger compartment, in the middle part in the vehicle width direction, it has a tunnel part that extends in the front-rear direction,
With a pair of left and right side sills extending in the front-rear direction across the tunnel portion,
The floor frame is provided with at least a pair of left and right across the tunnel portion,
The cross member is formed in a pipe shape across the entire length between the pair of left and right side sills while connecting the pair of left and right side sills across the tunnel portion.
The floor panel is divided into one central panel member constituting the tunnel portion in the vehicle width direction and a pair of left and right outer panel members sandwiching the central panel member,
Each opposing edge of the panel member adjacent in the vehicle width direction is joined to the upper surface of the floor frame in a state of being placed on the upper surface of the floor frame,
An automobile floor structure characterized by that. In claim 7,
The floor frame includes two inner floor frames near the tunnel portion and an outer floor frame near the side sill between the tunnel portion and the left side sill and between the tunnel portion and the right side sill. One by one,
The floor panel is divided into the central panel member and the outer panel member in the pair of left and right inner floor frames,
The outer panel member has the notch in the outer floor frame portion, and an opening edge of the notch is joined to the upper surface of the outer floor frame.
An automobile floor structure characterized by that.

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