JP4712435B2 - Vehicle body structure - Google Patents

Description

  The present invention relates to a vehicle body structure including a tunnel-shaped portion that extends forward and backward in the center of a vehicle body and that stores a propeller shaft and the like.

  2. Description of the Related Art Conventionally, a vehicle body structure under a vehicle center floor has a front frame (see reference numeral 61 in FIG. 6) and a rear frame, for example, arranged substantially parallel to the left and right sides with respect to the vehicle front-rear direction. And a cross member (see reference numerals 62 and 63 in FIG. 6) which is disposed along the vehicle width direction and connects the front frame and the rear frame. In a vehicle body structure such as a rear wheel drive vehicle or a four wheel drive vehicle, a floor tunnel (see FIG. 6) extends in the center of the vehicle body of the floor (see reference numeral 64 in FIG. 6) in order to arrange and store the propeller shaft. (See reference numeral 64a). For this reason, the opening 64b of the floor tunnel 64a of the floor 64 may be deformed in the opening direction or in the closing direction, which may adversely affect steering stability. The cross member 62 is provided with a tunnel-shaped portion (reference numeral 62a in FIG. 6) corresponding to the floor tunnel 64a.

  For example, in Patent Document 1, in order to improve the rigidity of the entire floor, in a vehicle body structure including a floor in which a floor tunnel extending in the front-rear direction is disposed at the center in the vehicle body width direction, the front and rear are symmetrically positioned on both sides of the floor tunnel. A grid of at least a pair of vertical skeletal members extending in a predetermined cross section and a plurality of horizontal skeleton members that are connected to both ends of the floor across the floor tunnel and arranged at predetermined intervals in the front-rear direction. A technique is disclosed in which a portion of the horizontal frame member corresponding to the floor tunnel is bonded to the lower surface of the floor.

Further, as shown in FIG. 6, in order to prevent the opening 64b of the floor tunnel 64a of the floor 64 from being deformed in the opening direction or the closing direction, for example, a plate-like plate 65 is formed on the lower surface of the front frames 61, 61. Can be considered to be connected horizontally.
No. 2003-11853

  However, the technique disclosed in Patent Document 1 has a structure in which the indoor cross member is fixed to the indoor side of the side sill. In this fixing structure, relative deformation may occur between the side sill and the front frame due to a torsional stress generated on the side sill. If relative deformation occurs between the side sill and the front frame, the steering stability is reduced.

  On the other hand, in the structure in which the plate 65 is connected horizontally to the front frames 61, 61 as shown in FIG. 6, the exhaust pipe 66 and the propeller shaft 67 are stored in the floor tunnel 64a by attaching the plate 65. May be constrained. Further, by increasing the thickness of the plate 65 in order to prevent deformation in the opening direction or the closing direction, there is a possibility that a problem may arise due to the ground height H changing to H1 lower than H under the plate. .

  The present invention has been made in view of the above circumstances, and suppresses deformation of the opening portion of the floor tunnel in the opening direction or the closing direction, and is generated between the front frame and the side sill constituting the main skeleton. An object of the present invention is to provide a vehicle body structure that suppresses general deformation.

The vehicle body structure of the vehicle according to the present invention is a pair of left and right front frames disposed along the front-rear direction of the vehicle, and is positioned outside the front frames and extends in the front-rear direction along the side of the vehicle body. A pair of side sills and a first cross member that is disposed on the outdoor side perpendicular to the front frame and connects the pair of front frames, the front frame and the side sill A pair of second cross members connected on the outdoor side, and a third cross member connecting the side sill and the first cross member on the indoor side, wherein the second cross member and the second cross member 3 cross member are paired set across the floor, joined to the cross member of said second overlaps with the lower surface of the side sill, cross member of said third upper surface of the side sill They are joined so as to overlap sandwiching fixing the side sill.

  According to this configuration, the side sill and the side sill are connected and joined by the skeleton that is formed in a straight line and integrally with the pair of the second cross member and the first cross member, thereby increasing the rigidity of the vehicle body.

  The first cross member has a tunnel-shaped portion, and an elongated plate-shaped stiffening member is attached to three bolts on the wall surfaces of a pair of rising portions forming the tunnel-shaped portion of the first cross member. It is fastened by fastening.

  According to this configuration, the stiffening member fastened and fixed to the wall surfaces of the pair of rising portions of the tunnel shape portion prevents the opening of the tunnel shape portion from being deformed in the opening direction or the deformation in the closing direction. Thus, the rigidity of the first cross member is increased.

  According to the present invention, a vehicle that suppresses deformation of an opening portion of a floor tunnel in an opening direction or a closing direction and suppresses a relative deformation that occurs between a front frame and a side sill constituting a main skeleton. Car body structure can be realized.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 5 relate to one embodiment of the present invention, FIG. 1 is a schematic plan view seen from the outdoor side for explaining the configuration of the body frame, and FIG. 2 includes a floor corresponding to the AA cross section of FIG. FIG. 3 is a schematic plan view seen from the outdoor side explaining the configuration of the front body frame, FIG. 4 is a diagram explaining the stiffening member, and FIG. 5 is a diagram explaining a modification of the stiffening member. is there. In the following description, the same symbols are attached to the left and right members for the left and right symmetrical members, and the description is simplified.

  As shown in FIG. 1, the main skeleton of the vehicle is located on the side of the vehicle body on a pair of left and right front frames 1, 1 arranged along the front-rear direction of the vehicle, and outside each front frame 1, 1. The side sills 2 and 2 extend in the front-rear direction, and the rear side frames 3 and 3 are disposed on the left and right sides of the rear part of the vehicle body at the rear end of the side sills 2 and 2.

  The rear ends of the front frames 1, 1 are connected to a rear front cross member 4 disposed so as to be orthogonal to the front frames 1, 1, in other words, disposed in the width direction. The rear portions of the side sills 2 and 2 are connected to respective end portions of the rear front cross member 4. In addition, the front portions of the rear side frames 3 and 3 are connected to the rear portions of the side sills 2 and 2 and to the respective end portions of the rear front cross member 4. A rear cross member 5 is connected to an intermediate portion of the rear side frames 3 and 3.

  An inclined portion 3a is provided slightly ahead of the portion where the rear wheels 6 and 6 of the left and right rear side frames 3 and 3 are disposed. The inclined portion 3a is slightly inwardly curved and extended upward in order to avoid interference with the rear wheels 6 and 6. An area indicated by a two-dot chain line surrounded by the left and right rear side frames 3 and 3, the rear front cross member 4 and the rear cross member 5 is secured as an area where the fuel tank 7 is disposed. Reference numeral 8 denotes a differential device, and reference numeral 9 denotes a front wheel.

  On the other hand, as shown in FIGS. 1 and 2, the first cross provided between the middle portions of the front frames 1 and 1, which are the center of the vehicle, is orthogonal to the front frames 1 and 1. The members are connected by a tunnel cross member 11 as a member. The tunnel cross member 11 has a tunnel-shaped portion 11a at the center. A member such as a propeller shaft center bearing that rotatably supports the propeller shaft 12, the exhaust pipe 13, and the propeller shaft 12 is arranged in the tunnel-shaped portion 11a.

  The middle part of the side sills 2, 2 and the middle part of the front frames 1, 1 which are the center of the vehicle are seat cross members 14, 14 which are third cross members disposed on the indoor side, and the seat cross member 14 , 14 in addition to floor cross members 15 and 15, which are second cross members newly provided on the outdoor side. The seat cross members 14, 14 and the floor cross members 15, 15 and the tunnel cross member 11 are arranged in a straight line with respect to the vehicle width direction. In the present embodiment, the floor cross members 15, 15 are opposed to the seat cross members 14, 14 via the floor 16.

  The outer portion of the seat cross member 14 is joined to the upper surface side of the side sill 2. On the other hand, the inner side portion of the seat cross member 14 is joined to the side surface of the wall surface 11 b of the rising portion of the tunnel cross member 11. Further, the outer portion of the floor cross member 15 is joined to the lower surface side of the side sill 2. On the other hand, the inner side part of the seat cross member 14 is joined to the flat part provided in each of the front frames 1 and 1. Further, the end portions of the tunnel cross members 11 and 11 are joined to flat portions provided on the front frames 1 and 1 respectively.

  That is, the side sills 2 and 2 are sandwiched between the seat cross members 14 and 14 and the floor cross members 15 and 15. Further, the side sill 2 on one side and the side sill 2 on the other side are a seat cross member 14 and a floor cross member 15 which are provided on one side, a tunnel cross member 11 and a seat cross member which is provided on the other side. 14 and the floor cross member 15 are connected by a skeleton configured in a straight line. Note that the seat cross members 14 and 14 and the floor cross members 15 and 15 have a hat cross-sectional shape. Reference numeral 17 is an engine, and reference numeral 18 is a transmission.

  In this way, a pair of floor cross members 15, 15 configured in a hat shape with respect to the tunnel cross member 11 that joins the front frames 1, 1 are joined in a straight line to form a skeleton in the width direction. By joining the respective end portions to the side sill, the side sills 2 and 2 can be joined together by one skeleton, and the rigidity of the main skeleton on the front side of the vehicle can be greatly improved.

  Further, a hat-shaped seat cross member 14 and a floor cross member 15 are provided opposite to each other with the floor 16 interposed therebetween, and the outer portions of the seat cross member 14 and the floor cross member 15 are respectively positioned on the upper surface side and the lower surface of the side sills 2 and 2. By joining the side sill 2, the side sills 2, 2 can be sandwiched and fixed by the seat cross member 14 and the floor cross member 15, and the side sills 2, 2 can be prevented from being twisted.

  By these things, the relative deformation | transformation of the front frames 1 and 1 and the side sills 2 and 2 can be suppressed.

  In this embodiment, the seat cross members 14 and 14 and the floor cross members 15 and 15 that are opposed to each other in the vehicle width direction via the floor 16 are joined to the front frame 1 and the tunnel cross member 11 that joins the front frames 1 and 1 to each other. A structure in which a skeleton arranged in a straight line is joined to the side sills 2 and 2 at a substantially central portion of the vehicle to suppress relative deformation and the like between the front frames 1 and 1 and the side sills 2 and 2 is shown. However, as shown in FIG. 3, the front wheel 9 to which the transmission 18 is attached may be configured in the same manner as described above.

  A specific configuration will be described with reference to FIG. In addition, about the structural member similar to embodiment shown in FIG.1 and FIG.2, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 3, the front side portions of the side sills 2 and 2 and the intermediate portion of the front frames 1 and 1 are connected to the seat cross members 14 and 14, which are third cross members disposed on the indoor side, and to the outdoor side. It connects with the floor cross members 15 and 15 which are the provided 2nd cross members. Further, the front portions of the side sills 2 and 2 and the intermediate portion of the front frames 1 and 1 are connected via a torque box 19. Also in this figure, the floor cross members 15 and 15 are opposed to the seat cross members 14 and 14 via the floor 16. Further, the seat cross members 14, 14 and the floor cross members 15, 15 and the tunnel cross member 11 are arranged in a straight line with respect to the vehicle width direction.

  As a result, the front frame 1, the side sill 2, the torque box 19, the seat cross member 14 and the floor cross member 15 intersect to form a truss structure indicated by a one-dot chain line and a two-dot chain line. Therefore, on the front wheel 9 side, in addition to the operations and effects of the above-described embodiment, the relative deformation of the front frame 1, 1 and the side sill 2, 2 on the front wheel 9 side can be more effectively suppressed.

  As shown in FIG. 2, a stiffener 20 as a stiffening member is fixed to the wall surfaces 11b of the pair of rising portions constituting the tunnel-shaped portion 11a of the tunnel cross member 11 by screwing. The stiffener 20 can be formed by sewing a gap formed between the propeller shaft 12 and the exhaust pipe 13 formed by an elongated plate member, and the opening 11c of the tunnel-shaped portion 11a is opened in the opening direction. This is a so-called brace that suppresses deformation and deformation in the closing direction. The stiffener 20 is placed in a predetermined position on the wall surface 11b of the rising portion with a gap formed between the propeller shaft 12 and the exhaust pipe 13 and the like, and a fixing bolt 21a, 21b, 21c and a nut (not shown). It is fastened and fixed by.

  As shown in FIGS. 2 and 4, the stiffener 20 is formed in a substantially L shape. One end 22 of the stiffener 20 is provided with one through hole 24a through which a fixing bolt 21a as a fastening member is inserted. On the other hand, two through holes 24b and 24c into which fixing bolts 21b and 21c are inserted are respectively formed in the other end portion 23 of the stiffener 20. Therefore, the stiffener 20 is fastened and fixed by so-called three-point tightening using the three fixing bolts 21a, 21b, and 21c to the wall surfaces 11b of the pair of rising portions constituting the tunnel-shaped portion 11a.

  As a result, the stiffener 20 is stably fixed to the tunnel-shaped portion 11a in a state where the rotational component is suppressed, the tunnel-shaped portion 11a is prevented from being deformed, and the rigidity of the tunnel cross member 11 is increased.

  Note that the thickness dimension of the stiffener 20 is appropriately set in consideration of rigidity. In addition, through holes (not shown) through which the fixing bolts 21a, 21b, 21c are inserted are formed in the wall surfaces 11b of the pair of rising portions constituting the tunnel-shaped portion 11a. Furthermore, the through hole 24a or the through hole 24b is a reference hole, and the diameter of the reference hole is smaller than the diameter of other through holes. When the stiffener 17 is fixed to the wall surface 11b of the rising portion by screwing, if the reference hole is the through hole 24b, the through hole 24b, the through hole 24a, and the through hole 24c are fastened in this order. On the other hand, when the reference hole is the through-hole 24a, the fastening is performed in the order of the through-hole 24a, the through-hole 24b or the through-hole 24c, and the through-hole 24c or the through-hole 24b. The through hole 24c may be set as a reference hole.

  As shown in FIG. 4, the shortest distance L1 from the edge of the through hole 24a provided in the one end 22 of the stiffener 20 to the end face of the one end, and the through hole 24b provided in the other end 23 of the stiffener 20; A relationship of L1 <L2 is set between the edge 24c and the shortest distance L2 from the end surface of the other end. The shortest distance L1 is such that the vicinity of the through hole 24a on the one end 22 side of the stiffener 20 is reliably broken by an impact received from, for example, a propeller shaft center bearing that rotatably supports the propeller shaft 12 at the time of a front collision or the like. For example, it is set to 3 mm. That is, the through hole 24a provided on the one end portion 22 side of the stiffener 20 is set as a fracture portion that is fractured at the time of collision.

  Thus, at the time of collision, when the propeller shaft center bearing that supports the propeller shaft 12 moves backward and collides with the stiffener 20, the one end portion 22 side of the stiffener 20 is broken by an impact load, and the propeller shaft 12 falls off. It has a structure.

  The formation position of the through hole formed in the wall surface 11b of the rising portion is set in consideration of the arrangement position of the propeller shaft 12 and the exhaust pipe 13 and the thickness of the wall surface 11b of the rising portion. . In addition, in the through holes 24b and 24c formed in the other end portion 23 and the through holes formed at predetermined positions on the wall surface 11b of the rising portion, the shortest distance from the edge portion to the end portion of each through hole is fixed. It is set in consideration of strength (also called durability). Further, the stiffener 20 is fixed to the wall surface 11b of the rising portion by fastening bolts from the rear side of the vehicle body in the above order in a state where the propeller shaft 12 is attached. The exhaust pipe 13 is disposed after the stiffener 20 is fastened.

  In this way, the stiffener 20 that is a stiffening member having a predetermined thickness dimension that can be arranged so as to sew between the propeller shaft 12 and the exhaust pipe 13 is fastened and fixed to the wall surface 11 b of the rising portion of the tunnel cross member 11. By doing so, the rigidity can be greatly improved without considering the ground clearance and without increasing the thickness dimension of the tunnel cross member 11. As a result, it is possible to prevent a problem that the opening 11c of the tunnel-shaped portion 11a is deformed in the opening direction or the closing direction, and to improve the vibration noise performance. In addition, members such as the propeller shaft 12 and the exhaust pipe 13 can be freely arranged in the tunnel-shaped portion 11a without impairing the design freedom. If the space for arranging the stiffener 20 can be secured, the stiffness of the tunnel cross member 11 can be improved by attaching the stiffener 20 to an existing vehicle.

  Further, the stiffener 20 is fastened to the wall surface 11b of the rising portion of the tunnel cross member 11 with the three fixing bolts 21a, 21b, and 21c, thereby stably attaching the stiffener 20 to the wall surface 11b of the rising portion while suppressing rotational components. be able to.

  Furthermore, the shortest distance L1 from the edge of the through hole 24a through which the one fixing bolt 21a provided on the one end 22 side of the stiffener 20 is inserted and disposed to the end surface of the one end is set to a predetermined value, The rupture portion is surely broken by the impact load received from the propeller shaft center bearing or the like that rotates and holds the propeller shaft 12 and so on, so that the rupture portion is broken by the impact load at the time of the front collision and the propeller shaft 12 is surely dropped. Can be made.

  In the embodiment described above, the seat cross members 14 and 14 and the floor cross members 15 and 15 that are opposed to each other in the vehicle width direction via the floor 16 are used as the tunnel cross member 11 that joins the front frames 1 and 1 to each other. On the other hand, the skeleton arranged in a straight line is joined to the side sills 2 and 2, and the stiffener 20 is fastened to the wall surface 11b of the rising portion of the tunnel cross member 11 so that the space between the propeller shaft 12 and the exhaust pipe 13 is sewn. By fixing, relative deformation or the like between the front frames 1 and 1 and the side sills 2 and 2 can be effectively suppressed.

  In addition, the seat cross members 14 and 14 and the floor cross members 15 and 15 that are arranged in the vehicle width direction via the floor 16 are arranged in a straight line with respect to the tunnel cross member 11 that joins the front frames 1 and 1 to each other. A structure in which the skeleton is joined to the side sills 2 and 2 or a structure in which the stiffener 20 is fastened and fixed to the wall surface 11b of the rising portion of the tunnel cross member 11 so as to sew between the propeller shaft 12, the exhaust pipe 13, and the like. Even when only one of the configurations is used for the vehicle body structure, relative deformation of the front frames 1, 1 and the side sills 2, 2 can be suppressed.

  Further, in the above-described embodiment, the seat cross members 14 and 14 and the floor cross members 15 and 15 are configured to face each other via the floor 16, but the seat cross members 14 and 14 and the floor cross member 15 are arranged. , 15 can be provided with a misalignment, but the effect is somewhat reduced, but the rigidity of the main skeleton on the front side of the vehicle can be improved and the twisting of the side sills 2, 2 can be suppressed. .

  Further, when there is room to arrange members such as the propeller shaft 12 and the exhaust pipe 13 in the tunnel-shaped portion, the stiffening member is used as a flat plate member 25 having a bent portion as shown in FIG. You may make it arrange | position along 11d of inclined surfaces of the cross member 11. FIG. Thus, the rigidity of the tunnel cross member 11 can be increased without changing the ground height, and the opening 11c can be prevented from being deformed in the opening direction or the closing direction.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.

Schematic plan view explaining the configuration of the body frame The figure including the floor corresponding to the AA cross section of FIG. The figure explaining the composition of the body frame of the front side The figure explaining a stiffening member The figure explaining the modification of a stiffening member The figure which shows the structure which connected the plate horizontally to the front frame provided in the outdoor side of the floor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Front frame 2 ... Side sill 11 ... Tunnel cross member 11a ... Tunnel shape part 12 ... Propeller shaft 13 ... Exhaust pipe 14 ... Seat cross member 15 ... Floor cross member 16 ... Floor 20 ... Stiffener

Claims (4)

A pair of left and right front frames disposed along the longitudinal direction of the vehicle;
A pair of side sills located outside the front frames and extending in the front-rear direction along the side of the vehicle body,
It is arranged on the outdoor side perpendicular to the front frame, is linearly arranged with respect to a first cross member that connects the pair of front frames, and connects the front frame and the side sill on the outdoor side. A pair of second cross members;
A third cross member for connecting the side sill and the first cross member on the indoor side;
Comprising
The second cross member and the third cross member are opposed to each other across the floor, the second cross member is joined so as to overlap the lower surface of the side sill, and the third cross member is connected to the side sill. A vehicle body structure characterized in that the side sill is sandwiched and fixed so as to overlap with an upper surface of the vehicle. The first cross member has a tunnel-shaped portion;
Body structure of a vehicle according to claim 1, characterized in that the wall surface of the pair of upstanding portions forming the tunnel-shaped portion of the first cross member, provided with a stiffening member is concluded. The stiffening member has a substantially L-shaped elongated plate shape, and one end portion is on one side, the other end portion, and the corners so that the substantially L-shaped corner portion is on the upper side. The vehicle body structure according to claim 2, wherein the portion is fastened at three points by the other rising portion and a bolt. The stiffening member has one through hole through which a bolt for fastening the one end to the wall surface of one rising portion is inserted on one end, and the other end on the other end. A structure including two through holes through which a bolt for fastening to the wall surface of the rising portion of
The shortest distance from the edge of the through hole provided on the one end side to the end face on the one end side, and the shortest distance from the edge of each through hole provided on the other end side to the end face on the other end side Set it to a shorter predetermined value,
Body structure for a vehicle according to the one end side, in claim 2 or claim 3, characterized in that set as the breaking portion is broken by the load received from the propeller shaft at the time of collision.

Images