JP2007284003A - Lower body structure - Google Patents

Abstract

An object of the present invention is to provide a vehicle body lower structure that increases strength against a load applied to the front surface of a vehicle and secures a desired compartment space when the load is applied to the front surface of the vehicle.
In a lower body structure 11, a floor frame 17 included in a floor of a passenger compartment is provided with a reinforcing member 91 in a groove having a U-shaped cross section. In the reinforcing member 91, the second groove bottom 114 of the groove-shaped second reinforcing member 96 is disposed along the first groove bottom 106 of the groove-shaped first reinforcing member 95, and the first groove bottom extends from the second groove bottom. A first convex bead portion 115 having a convex cross section projecting in a direction away from the first groove is formed, and a second convex bead portion 126 having a convex cross section projecting in a direction away from the bottom of the first groove is formed on the second groove bottom. A closed cross-sectional shape is formed by the first and second convex bead portions.
[Selection] Figure 3

Description

  The present invention relates to a vehicle body lower structure including a side sill under a side body, and a floor frame and a floor cross member that are included in a floor of a passenger compartment and are long in the front-rear direction of the vehicle.

The strength of the vehicle body is increased for the purpose of protecting passengers in the event of a collision (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 10-218035 (page 4, FIG. 1)

Patent document 1 is demonstrated based on the following figure.
FIG. 5 is a diagram for explaining a basic configuration of a conventional technique. A side body structure 201 of a conventional automobile has a first side sill reinforcement 203 having a length L1 in a side sill 202 on a lower side of the body. And the front is coupled to the front hinge pillar 204, the rear is superimposed on the third cross member 206 behind the center pillar 205, and a second side sill reinforcement 207 having a length L2 is disposed in the side sill 202. Since the front is coupled to the front hinge pillar 204 and the rear is overlapped with the second cross member 208 in front of the center pillar 205, the side impact load can be effectively supported.

  However, the side body structure 201 of the automobile of Patent Document 1 effectively supports a side impact load, but there is a problem that it is difficult to increase the strength against the impact of a frontal collision applied to the front face of the automobile.

  An object of the present invention is to provide a vehicle body lower structure that increases strength against a load applied to the front surface of a vehicle and secures a desired vehicle compartment space when the load is applied to the front surface of the vehicle.

  In the invention according to claim 1, in the vehicle body lower structure including the floor frame that is included in the floor of the passenger compartment and is long in the front-rear direction of the vehicle, and the side sill under the side body, the floor frame has a U-shaped cross section. A reinforcing member is attached in the groove, and the reinforcing member is disposed along the first groove bottom of the groove-shaped first reinforcing member, and the second groove bottom of the groove-shaped second reinforcing member is disposed on the first groove bottom. A convex first convex bead portion protruding in a direction away from the second groove bottom is formed, and a convex second convex bead portion protruding in the direction away from the first groove bottom is formed on the second groove bottom. The first and second convex bead portions form a closed cross-sectional shape.

  In the invention according to claim 2, the reinforcing member is arranged on the floor frame of the driver's seat, one end is arranged in the front part of the driver's seat, and the other end side is below the front part of the seat arranged in the driver's seat. It is arranged.

  In the invention according to claim 3, the other end of the second reinforcing member extends to the first floor cross member connected to the side sill, and the first reinforcing member is connected to the center pillar of the side body. The other end is extended to the second floor cross member.

  The invention according to claim 4 is characterized in that the rear portion of the seat is disposed above the second floor cross member.

  In the invention according to claim 1, the floor frame has a reinforcing member attached in a groove having a U-shaped cross section, and the reinforcing member is a groove-shaped second member along the first groove bottom side of the groove-shaped first reinforcing member. The second groove bottom of the reinforcing member is disposed, and a first convex bead portion having a convex cross section is formed on the first groove bottom so as to protrude in a direction away from the second groove bottom, and the second groove bottom is formed from the first groove bottom. Since the second convex bead portion having a convex cross section is formed by projecting in the separating direction and the first and second convex bead portions form a closed cross sectional shape, the floor panel and the floor frame sealing the opening of the floor frame Even if the cross-sectional area of the closed cross-section (first closed cross-section) formed by the first and second reinforcing members is small, the second cross-sectional area is maximized inside the floor frame by the second reinforcing member. A closed cross section can be formed. As a result, the force transmitted to the floor frame itself is reduced by the second closed cross section formed by the first and second convex bead portions, and as a result, the longitudinal strength of the entire floor frame is increased, and the front of the vehicle is increased. There is an advantage that the strength of the floor frame against the applied load can be increased.

  Also, since the longitudinal strength of the floor frame can be adjusted by the first and second reinforcing members in this way, only the floor frame is used for a vehicle type that does not require the longitudinal strength of the floor frame relatively. In the case of a vehicle type that needs to increase the strength in the longitudinal direction, the first and second reinforcing members are employed. That is, it is possible to manufacture a vehicle type with different strength requirements using the same floor frame.

  In the invention according to claim 2, the reinforcing member is arranged on the floor frame of the driver's seat, one end is arranged in the front part of the driver's seat, and the other end side is below the front part of the seat arranged in the driver's seat. As a result, the reinforcement member increases the strength of the floor frame between the front part of the driver's seat, for example, from the feet to the front part of the driver's seat, and when a load is applied to the front of the vehicle, the driver's seat There is an advantage that a desired vehicle compartment space can be secured between the feet of the vehicle and the seat of the driver's seat.

  In the invention according to claim 3, the other end of the second reinforcing member extends to the first floor cross member connected to the side sill, and the first reinforcing member is connected to the center pillar of the side body. Since the other end is extended to the second floor cross member, when a load is applied to the front surface of the vehicle, the force is transmitted from the first floor cross member to the side sill by the first and second reinforcing members, and further the second reinforcement. It is transmitted to the center pillar by the member. As a result, the force applied to the floor frame can be distributed throughout the vehicle body. Therefore, the load applied to the front surface of the vehicle can be absorbed by the entire vehicle body.

In the invention which concerns on Claim 4, since the rear part of a seat is arrange | positioned above the 2nd floor cross member, with respect to the load added to the front surface of a vehicle, a seat is a reinforcement member ahead from a 2nd floor cross member. The second reinforcing member that functions and is attached to the floor frame under the seat can be omitted, and the weight can be reduced.
Further, the seat mounting strength with respect to the longitudinal force applied to the seat is increased, and displacement of the seat in the longitudinal direction can be suppressed.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a perspective view of a lower body structure of the present invention.
The vehicle body lower structure 11 includes left and right side sills 15 and 16 below the left and right side bodies 13 and 14 included in the side wall of the passenger compartment 12, left and right floor frames 17 and 18 included in the floor of the passenger compartment 12, and left and right side frames. Between the first floor cross member 21 connected between the side sills 15 and 16, the second floor cross member 22 connected between the left and right floor frames 17 and 18, and between the left floor frame 17 and the left side sill 15. A left outrigger 23 attached to the right floor frame 18, a right outrigger 24 attached between the right side sill 16, a left front side frame 25 connected to the left floor frame 17, and a right floor frame. 18, a right front side frame 26 connected to 18, and a floor panel 27. 31 are those employed in the vehicle body 32.

  In the figure, 33 is the engine room, 34 is the left center pillar standing on the left side sill 15, 35 is the right center pillar standing on the right side sill 16, and 36 is between the left and right floor frames 17,18. And a vertical frame that is supported at one end by the first floor cross member 21.

The left front side frame 25 has a rear end 41 connected to a front end 42 of the left floor frame 17.
The right front side frame 26 has a rear end 43 connected to a front end 44 of the right floor frame 18.

The front side 46 of the left side sill 15 is joined to the front end 42 of the left floor frame 17 by a front outrigger 47.
The right side sill 16 has a front end 48 joined to a front end 44 of the right floor frame 18 by a front outrigger 51.

  The first floor cross member 21 has a front portion 55 (similar to the seat 54) of the front seat 55 of the driver seat 53 (see FIG. 2) and a front passenger seat 56 (same as the seat 54) disposed on the left. Is attached to the left side sill 15, the right end 58 is joined to the right side sill 16, and seat front mounting portions 62 and 62 having female threads are formed on the upper portion 61. The lower part 63 is attached to the upper surface of the panel 27, the left side of the lower part 63 is attached to the left floor frame 17 below the floor panel 27, and the right side of the lower part 63 is attached to the right floor frame 18 below the floor panel 27. .

  The second floor cross member 22 has a left end 67 attached to the cross portion 66 of the left floor frame 17 joined to the lower portion of the left center pillar 34 via the left outrigger 23, and the right center trigger 35 has the right outrigger 24. The right end 71 is attached to the cross portion 68 of the right floor frame 18 connected via the seat, the seat rear attachment portion 72 having a female screw is attached to the left end 67, and the seat rear attachment portion 73 having a female screw is attached to the right end 71. Is installed.

The left outrigger 23 is formed with a seat rear mounting bracket 75 having a female thread.
The right outrigger 24 is formed with a seat rear mounting bracket 76 having a female screw.

  FIG. 2 is a side view of the lower body structure of the present invention and shows the relationship between the seat 54 of the driver's seat 53, the left floor frame 17, and the first floor cross member 21. This will be described with reference to FIG.

In the first floor cross member 21, the front portion 55 of the seat 54 is attached to the seat front attachment portions 62 and 62, and supports the front portion 55 of the seat 54. Similarly, the passenger seat 56 is supported.
The second floor cross member 22 also has a rear portion 78 of the seat 54 attached to the seat rear attachment portion 72 through the floor panel 27 and supports the rear portion 78 of the seat 54. Similarly, the passenger seat 56 is supported.

  The left outrigger 23 supports a rear portion 78 of the seat 54 by attaching a rear portion 78 of the seat 54 to the seat rear portion mounting bracket 75 through the floor panel 27. Similarly, the passenger seat 56 is supported.

FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 1 and shows a cross section of the left floor frame 17. This will be described with reference to FIG.
The left floor frame 17 has a U-shaped cross section perpendicular to the longitudinal direction (the direction of the arrow a1 in FIG. 1), and has a groove bottom 81 and side edges 82 and 83 connected to the groove bottom 81, and is formed in the longitudinal direction ( A linear beam portion 84 that is arranged in the front-rear direction (the direction of arrow a1) of the vehicle 31 is formed as a floor of the vehicle compartment 12 and is connected to the linear beam portion 84 to form the vehicle compartment 12. In the vicinity of the boundary between the engine room 33 and the engine room 33, a bent portion 85 is formed, and an inclined portion 86 is formed which continues to the bent portion 85 and reaches the engine room 33. The opening 88 is arranged upward (in the direction of the arrow a2), and a reinforcing member 91 is attached in the groove. H is the average height of the beam portion 84 of the floor frame 17.
Note that “the cross-sectional shape is a U-shape” includes a U-shape or a shape in which the sides 82 and 83 are inclined so as to form a V shape with the sides 82 and 83.

The side 82 is inclined by a predetermined angle θ so as to form a V shape, and a latching step portion 92 is formed at the center of the height (H × about 50%).
The side 83 is inclined by a predetermined angle θ so as to form a V shape, and a latching step portion 93 is formed at the center of the height (H × about 50%).
A reference hole 94 used for assembling the reinforcing member 91 is formed in the groove bottom 81.

FIG. 4 is a perspective view of a reinforcing member provided in the lower body structure of the present invention. This will be described with reference to FIGS.
The reinforcing member 91 includes a first reinforcing member 95 and a second reinforcing member 96, and is disposed on the floor frame 17 of the driver's seat 53. One end (front end) 101 is disposed on the front portion 102 of the driver's seat 53. The end side (rear end side) 103 is disposed below the front portion 55 of the seat 54 disposed in the driver seat 53.

The “front portion 102 of the driver's seat 53” is a position where the driver puts his / her foot.
“The other end side (rear end side) 103 of the reinforcing member 91” is a portion disposed below the front portion 55 of the seat 54 and at the same time a portion disposed below the seat front mounting portion 62. . That is, it is near the other end (the other end (rear end) 112, the other end (rear end) 125), and may be near the center (about 50% of the length) depending on the vehicle.

The first reinforcing member 95 has a U-shaped cross section orthogonal to the longitudinal direction (the direction of the arrow a1), and the first groove bottom side 106 and the first side sides 107 and 108 connected to the first groove bottom side 106 are formed. Thus, one end (front end) 111 is disposed at the front portion 102 of the driver seat 53, and the other end (rear end) 112 is disposed below the rear portion 78 of the seat 54 disposed at the driver seat 53. The other end (rear end) 112 extends to the second floor cross member 22 connected to the lower end of the left center pillar 34. L 1 is the length of the first reinforcing member 95.
One end (front end) 111 is also one end (front end) 101 of the reinforcing member 91.

As shown in FIG. 3, the first groove bottom 106 is protruded in the direction away from the second groove bottom 114 of the second reinforcing member 96 (the direction of the arrow a <b> 3) at the center of the width of the first groove bottom 106. A first convex bead portion 115 having a convex cross section is formed, and a first reference hole 116 is formed in the first convex bead portion 115.
The first reference hole 116 is concentric with the reference hole 94 of the left floor frame 17 and has a smaller diameter than the reference hole 94.

  The first convex bead portion 115 is formed with first vertical sides 117 and 117 that are continuous to the first groove bottom side 106, and is connected to the first vertical sides 117 and 117 and has a first horizontal side 118 that is parallel to the first groove bottom side 106. This is the part that is molded.

The second reinforcing member 96 has a U-shaped cross section perpendicular to the longitudinal direction (the direction of the arrow a1), and the second groove base 114 and the second side edges 122 and 123 connected to the second groove base 114 are formed. In addition, one end (front end) 124 is disposed in the front portion 102 of the driver seat 53, and the other end (rear end) 125 is disposed below the rear portion 78 of the seat 54 disposed in the driver seat 53. The other end (rear end) 125 extends to the first floor cross member 21 connected to the left side sill 15. L 2 is the length of the second reinforcing member 96.
One end (front end) 124 is also one end (front end) 101 of the reinforcing member 91.

The second groove bottom 114 is a second convex bead having a convex cross section that protrudes in the direction away from the first groove bottom 106 of the first reinforcing member 95 (in the direction of arrow a4) at the center of the width of the second groove bottom 114. 126 is formed, and a second reference hole 127 is formed in the second convex bead portion 126.
The second reference hole 127 is concentric with the reference hole 94 of the left floor frame 17 and has a diameter smaller than that of the first reference hole 116.

  The second convex bead portion 126 is formed with second vertical sides 131 and 131 that are continuous with the second groove bottom 114, and is continuous with the second vertical sides 131 and 131 and is parallel to the second groove bottom 114. This is the part that is molded.

Next, a procedure for assembling the reinforcing member 91 to the left floor frame 17 in FIGS. 3 and 4 will be briefly described.
First, the reference hole 94 of the left floor frame 17, the first reference hole 116 of the first reinforcing member 95, and the second reference hole 127 of the second reinforcing member 96 are fitted into the reference pin 142 of the assembly jig 141 in order.

  Subsequently, the left floor frame 17 and the first and second reinforcing members 95, 96 are welded with a spot welding device. That is, the side edges 82 and 83 of the left floor frame 17, the first side edges 107 and 108 of the first reinforcing member 95, and the second side edges 122 and 123 of the second reinforcing member 96 are fixed by the welded portion 143. After welding, the left floor frame 17 (including the reinforcing member 91) is removed from the assembly jig 141 to obtain the left floor frame 17 to which the reinforcing member 91 is attached.

  In the lower body structure 11, the reference hole 94 of the left floor frame 17, the first reference hole 116 of the first reinforcing member 95, and the second reference hole 127 of the second reinforcing member 96 are opened, so that the left floor frame 17 The assembly accuracy of the first and second members 95 and 96 with respect to the mounting position (X-axis direction and Z-axis direction with respect to the driver) can be increased.

The right side sill 16 (see FIG. 1) includes a first reinforcing member 95.
The right side sill 16 has a configuration in which the first reinforcing member 95 is attached, but it is also possible to attach the first and second reinforcing members 95 and 96 in the same manner as the left floor frame 17.

Next, the operation of the lower body structure of the present invention will be described.
As shown in FIGS. 1 and 3, when a load F is applied to the front surface of the vehicle 31, the force is transmitted from the left front side frame 25 to the left floor frame 17 as indicated by an arrow a5, Since the first and second reinforcing members 95 and 96 are dispersed as indicated by an arrow a6, the strength of the floor frame 17 can be increased by the first and second reinforcing members 95 and 96.

  Specifically, when the first and second reinforcing members 95 and 96 are attached in the floor frame 17, the force transmitted to the floor frame 17 by the first convex bead portion 115 formed in the first reinforcing member 95 is reduced. Since the strength in the longitudinal direction of the floor frame 17 is increased and the force transmitted to the floor frame 17 by the second convex bead portion 126 of the second reinforcing member 96 is reduced, the strength in the longitudinal direction of the floor frame 17 is increased. The strength of the floor frame 17 against the load F applied to the front surface of the vehicle 31 can be increased.

  As shown in FIG. 2, in the vehicle body lower structure 11, the reinforcing member 91 is disposed on the floor frame 17 of the driver seat 53, and one end (front end) 101 is disposed on the front portion 102 of the driver seat 53. Since the other end side (rear end side) 103 is disposed below the front portion 55 of the seat 54 disposed in the driver seat 53, the seat of the driver seat 53 from the front portion 102 of the driver seat 53 by the reinforcing member 91. The strength of the floor frame 17 up to the front portion 55 of 54 is increased, and a desired vehicle compartment space can be secured in the driver's seat 53 when a load F is applied to the front surface of the vehicle 31.

  Further, as shown in FIG. 1, when a load F is applied to the front surface of the vehicle 31, the force is transmitted to the left floor frame 17, the first and second reinforcing members 95 and 96, and the first and second reinforcing members 95, 96 is transmitted to the left side sill 15 via the first floor cross member 21, and further transmitted to the left center pillar 34 from the left outrigger 23 as indicated by an arrow a7 by the first reinforcing member 95. As a result, the force applied to the left floor frame 17 is distributed throughout the vehicle body 32.

  Thus, in the vehicle body lower structure 11, the second reinforcing member 96 has the other end (rear end) 125 extended to the first floor cross member 21 connected to the side sill (left side sill) 15. The other end (rear end) 112 of the first reinforcing member 95 extends to the second floor cross member 22 connected to the center pillar (left center pillar) 34 of the side body 13. When a load is applied, the load can be dispersed throughout the vehicle body 32. Therefore, the load applied to the front surface of the vehicle 31 can be absorbed by the entire vehicle body 32.

When the first and second reinforcing members 95 and 96 are attached to the right side sill 16 in the same manner as the left floor frame 17, the same effects as described above can be exhibited.
Here, since the right side sill 16 includes the first reinforcing member 95, the characteristics are lower than those of the left floor frame 17 including the first and second reinforcing members 95 and 96, but the first and second reinforcing members are included. The same effect as that of the left floor frame 17 provided with the members 95 and 96 can be exhibited.

  The vehicle body lower part structure of the present invention is suitable for a four-wheeled vehicle.

The perspective view of the lower body structure of the present invention Side view of the lower body structure of the present invention 3-3 sectional view of FIG. The perspective view of the reinforcement member with which the vehicle body lower part structure of this invention is provided The figure explaining the basic composition of conventional technology

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Vehicle body lower structure, 12 ... Car compartment, 13, 14 ... Side body, 15, 16 ... Side sill, 17, 18 ... Floor frame, 21 ... 1st floor cross member, 22 ... 2nd floor cross member, 31 ... Vehicle 34, 35 ... center pillar, 53 ... driver's seat, 54 ... seat arranged in the driver's seat, 55 ... front of the seat, 78 ... rear of the seat, 91 ... reinforcing member, 95 ... first reinforcing member, 96 ... 2nd reinforcement member, 101 ... one end of reinforcement member, 102 ... front part of driver's seat, 103 ... other end side of reinforcement member, 106 ... 1st groove bottom of 1st reinforcement member, 114 ... 2nd of 2nd reinforcement member Groove bottom, 115 ... first convex bead part, 125 ... other end of the second reinforcing member, 126 ... second convex bead part.

Claims (4)

In the vehicle body lower structure that is included in the passenger compartment floor and has a floor frame that is long in the longitudinal direction of the vehicle, and a side sill at the bottom of the side body,
The floor frame has a reinforcing member attached in a groove having a U-shaped cross section,
In the reinforcing member, a second groove bottom of the groove-shaped second reinforcing member is disposed along the first groove bottom of the groove-shaped first reinforcing member, and the first groove bottom is separated from the second groove bottom. A first convex bead portion having a convex cross section is formed, and a second convex bead portion having a convex cross section is formed at the bottom of the second groove in a direction away from the bottom of the first groove. A vehicle body lower structure characterized in that a closed cross-sectional shape is formed by the second convex bead portion.   The reinforcing member is disposed on the floor frame of the driver seat, one end is disposed on the front portion of the driver seat, and the other end side is disposed below the front portion of the seat disposed on the driver seat. The vehicle body lower structure according to claim 1. The other end of the second reinforcing member is extended to the first floor cross member connected to the side sill.
The vehicle body lower part structure according to claim 2, wherein the first reinforcing member has the other end extended to a second floor cross member connected to a center pillar of the side body.   The vehicle body lower structure according to claim 3, wherein a rear portion of the seat is disposed above the second floor cross member.

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