JP2020090178A - Vehicle lower part structure - Google Patents

Abstract

To provide a vehicle lower part structure which can sufficiently protect a vehicle cabin during a side collision while keeping a height of a lower end of a door opening at a low level.SOLUTION: A vehicle lower part structure includes: a pair of rockers 24 extending in a vehicle fore and aft direction at left and right lower ends of a vehicle cabin; a pair of floor side members 34 extending in the vehicle fore and aft direction at the inner side relative to the pair of rockers 24 in a vehicle width direction; a cross member 38 spanned between the pair of floor side members 34; outriggers 36, each of which is spanned between the rocker 24 and the floor side member 34; and lower rails 18, each of which guides a moving direction of a slide door, is provided at the same height position as the rocker 24, and partially protrudes to the inner side relative to the rocker 24 in the vehicle width direction. The outrigger 36 is offset upward relative to the lower rail 18 and provided at a position arranged along a substantially straight line with the cross member 38 in the vehicle width direction.SELECTED DRAWING: Figure 2

Description

The present specification discloses a vehicle lower structure having a slide door that is opened and closed by sliding in the vehicle front-rear direction.

BACKGROUND ART Conventionally, a vehicle having a slide door that slides in the vehicle front-rear direction to be opened and closed is widely known. In such a vehicle, there is a demand to lower the height of the lower end of the door opening in order to facilitate the loading and unloading of passengers and the loading and unloading of luggage, and to secure a wide door opening.

In order to meet these demands, it has been conventionally proposed to provide a lower door rail (hereinafter referred to as “lower rail”) that guides the movement of the slide door at substantially the same height as the rocker. The rocker is a skeleton member which is arranged at both ends of the floor surface (floor) of the vehicle compartment and extends in the vehicle front-rear direction. Such a rocker is usually configured by joining a substantially hat-shaped rocker inner opening to the outside in the vehicle width direction and a substantially hat-shaped rocker outer opening to the inside in the vehicle width direction.

Patent Document 1 discloses a technique of arranging a lower rail in a side sill (corresponding to a rocker). Specifically, in Patent Document 1, an opening for a door slide mechanism is formed on a side surface of a side sill outer (corresponding to a rocker outer). Then, a box member opened to the outside in the vehicle width direction is arranged in the side sill through the opening for the door slide mechanism. Further, a lower rail having a U-shaped cross section is welded to the ceiling wall of the box member. According to the technique of Patent Document 1, the lower rail can be arranged at substantially the same height as the rocker, and as a result, the lower end height of the door opening can be lowered.

Further, in Patent Document 1, an engaging member (specifically, a pin member that protrudes inward in the vehicle width direction from the inner surface of the slide door) is provided at the lower end of the slide door so as to enter the opening for the door slide mechanism. There is. When a side collision occurs in which an obstacle collides with a side portion of the vehicle, the engaging member engages (abuts) the box member, so that the slide door is prevented from entering the vehicle interior.

JP 2006-15928 A

In the technique of Patent Document 1 described above, the energy at the time of a side collision can be received to some extent by the rocker (side sill) via the engaging member and the box member. However, the rocker alone has a limit in the collision energy that can be received. As a result, the technique of Patent Document 1 may not be able to sufficiently protect the vehicle interior during a side collision.

In view of this, the present specification discloses a vehicle lower structure that can sufficiently protect the vehicle interior in the event of a side collision while suppressing the lower end height of the door opening to be low.

The vehicle lower structure disclosed in the present specification includes a pair of rockers that extend in the vehicle front-rear direction at lower left and right ends of a vehicle compartment, and a pair of floor side members that extend in the vehicle front-rear direction inside the pair of rockers in the vehicle width direction. A cross member that is bridged between the pair of floor side members, an outrigger that is bridged between the lower rail and the floor side member, and a lower rail that guides the moving direction of the slide door, the same as the rocker. A lower rail that is provided at a height position and partially protrudes inward in the vehicle width direction from the rocker; and the outrigger is offset upward with respect to the lower rail and is substantially in the vehicle width direction with the cross member. It is provided in a lined position.

According to the vehicle undercarriage disclosed herein, the outrigger is offset upward with respect to the door rail. Therefore, the outrigger can be provided at a position substantially aligned with the cross member in the vehicle width direction. Since the outrigger and the cross member are arranged in a substantially straight line, the collision load received by the rocker at the time of a side collision is transmitted to the cross member via the outrigger and the floor side member and dispersed. As a result, the concentration of the load is prevented from being concentrated, so that damage to the skeleton member such as the rocker is effectively prevented, and the vehicle interior is appropriately protected.

1 is a schematic perspective view of a vehicle body. It is sectional drawing in the X position in the state which closed the slide door. It is the perspective view which looked at the X position circumference from the lower part. It is the perspective view which looked at the X position circumference from the lower part, and is a figure which omitted illustration of a door pocket cover.

Hereinafter, the lower structure of the vehicle will be described with reference to the drawings. FIG. 1 is a schematic perspective view of a vehicle body. As shown in FIG. 1, a front door opening 10 and a rear door opening 12 are provided side by side in the front-rear direction on the side of the vehicle. A front pillar opening 10 and a rear door opening 12 are partitioned by a center pillar 14 extending in the vehicle vertical direction.

The rear door opening 12 is opened and closed by a slide door 16 which is a rear door. In order to guide the sliding movement of the sliding door 16, upper rails 20 and lower rails 18 are provided above and below the rear door opening 12. Of these, the lower rail 18 is provided in a rocker 24 extending in the vehicle front-rear direction. The rocker 24 is a skeleton member extending in the vehicle front-rear direction, and is provided on both left and right sides of the vehicle.

The front end of the lower rail 18 is curved inward in the vehicle width direction and protrudes inward in the vehicle width direction from the rocker 24. Hereinafter, the lower structure near the front end of the lower rail 18, that is, near the X position in FIG. 1 will be described. FIG. 2 is a cross-sectional view at the X position in FIG. FIG. 3 and FIG. 4 are perspective views of the vehicle viewed from the lower side near the X position. In addition, in FIG. 4, illustration of an outrigger 36 described later is omitted.

The vehicle is provided with a pair of rockers 24 (only one rocker 24 is shown in FIGS. 2 to 4; the floor side members 34 are the same) arranged at intervals in the vehicle width direction. The rocker 24 is a skeleton member having a closed cross section that extends in the vehicle front-rear direction. In this example, the rocker 24 is configured by joining a rocker outer 44 and a rocker inner 46. The rocker outer 44 has a substantially hat-shaped cross section that is open to the inside in the vehicle width direction. Similarly, the rocker inner 46 has a substantially hat-shaped cross section that is open outward in the vehicle width direction.

The end of the floor panel 32 is joined to the upper surface of the rocker inner 46. The floor panel 32 is a panel member that constitutes the floor surface of the vehicle interior. Inside the rocker 24 in the vehicle width direction, a pair of floor side members 34 arranged at intervals in the vehicle width direction are provided. The floor side member 34 is a skeleton member that extends in the vehicle front-rear direction and has a substantially hat-shaped cross section that opens upward. The floor side member 34 is joined to the lower surface of the floor panel 32 so as to close the opening. Thus, a closed cross section extending in the vehicle front-rear direction is formed between the floor panel 32 and the floor side member 34.

A cross member 38 is connected to the inner side surface of the floor side member 34 in the vehicle width direction. The cross member 38 is a skeleton member that is stretched over the pair of floor side members 34, and extends in the vehicle width direction. The cross member 38 has a substantially hat-shaped cross section that opens upward, and is joined to the lower surface of the floor panel 32 so as to close the opening.

An outrigger 36 is provided at substantially the same position in the vehicle front-rear direction as the cross member 38. The outrigger 36 is a reinforcing member that is bridged between the rocker 24 and the floor side member 34. The outrigger 36 has a substantially dish shape with an upward opening, and its left and right ends are joined to the rocker 24 and the floor side member 34, and its front and rear ends are raised and joined to the floor panel 32. With this configuration, a closed cross section is formed between the outrigger 36 and the floor panel 32. The outrigger 36 functions as a transmission member that transmits collision energy from the rocker 24 to the cross member 38 when a side collision occurs in which an obstacle collides with the side of the vehicle, which will be described later.

A door pocket 30 is provided inside the rocker 24. The door bag 30 is a box-shaped member that houses the guide roller unit 22. More specifically, the door pocket 30 has a substantially U-shaped cross section that is open outward in the vehicle width direction. Such a door pocket 30 is composed of a door pocket lower 56 having a substantially L-shaped cross section and a door pocket upper 54 having a substantially inverted L-shaped cross section.

On the side surface of the rocker outer 44, a side surface opening 45 is formed to connect the opening of the door pocket 30 and the external space. In addition, as shown in FIG. 4, the front end portion of the door pocket 30 projects further inward than the rocker 24 in the vehicle width direction. A side opening 47 is also formed on the side surface of the rocker inner 46 to allow the door pocket 30 to project inward. In other words, near the front end of the door pocket 30, the rocker 24 has a through hole penetrating in the vehicle width direction. In the following description, a portion of the door pocket 30 that protrudes inward in the vehicle width direction with respect to the rocker 24 is referred to as a door pocket protrusion 31.

The lower rail 18 is attached to the lower surface of the upper door case 54. The lower rail 18 is a rail member that extends in the vehicle front-rear direction and has a substantially U-shaped cross section that opens downward. Inside the lower rail 18, a horizontal roller 58 that rotates around a vertical axis and rolls is assembled. The lateral roller 58 rolls along the lower rail 18. A vertical roller 60 that rotates around a horizontal axis and rolls is provided in the door pocket 30. The horizontal roller 58 and the vertical roller 60 are connected to the lower arm 62 via a connecting member (not shown).

The lower arm 62 is a member having a substantially L-shaped cross section that extends horizontally in the door pocket 30, then passes through the side surface opening 45, jumps to the outside, and extends upward. The slide door 16 is joined to a tip of the lower arm 62, that is, a portion extending upward. As a result, the slide door 16 is connected to the horizontal roller 58 and the vertical roller 60 via the lower arm 62, and the moving direction of the slide door 16 is restricted by the lower rail 18.

A fuel tank 64 is arranged below the floor panel 32. As is clear from FIG. 2, the fuel tank 64 is located inside the rocker 24 and the lower rail 18 in the vehicle width direction. The fuel tank 64 is supported by the tank band 70. Both ends of the tank band 70 are fixed to the vehicle body via fastening brackets 66. More specifically, the fastening bracket 66 has a substantially horizontal fastening surface, and a fastening hole into which a fastening bolt 72 described later is inserted is formed in the fastening surface. The end of the fastening bracket 66 is joined to the outrigger 36 and the floor side member 34. Further, a weld nut 68 is fixed at a position on the back side of the fastening surface and corresponding to the fastening hole. The fastening bolt 72 is screwed to the weld nut 68 with the end of the tank band 70 sandwiched between the head of the fastening bolt 72 and the fastening bracket 66.

Here, as is apparent from FIG. 2, the tank band 70 and the fuel tank 64 are located inside the lower rail 18 in the vehicle width direction and at a position slightly below. In this example, a door pocket cover 74 is interposed between the door pocket 30 and the tank band 70. The door pocket cover 74 is a sheet metal member that completely covers the door pocket protrusion 31 and the fastening bracket 66 from the lower side. More specifically, one end of the door pocket cover 74 in the vehicle width direction is joined to the side surface of the rocker inner 46 at a position below the door pocket protrusion 31. The other end of the door pocket cover 74 in the vehicle width direction extends to the vicinity of the lower end of the floor side member 34. Both ends of the door pocket cover 74 in the front-rear direction are raised upward and joined to the floor panel 32. Further, an insertion hole through which the fastening bolt 72 is inserted is formed in the middle of the door pocket cover 74, and the door pocket cover 74 is fastened to the fastening bracket 66 together with the tank band 70. In other words, the door pocket cover 74 extends from the vehicle width direction inner side surface of the rocker 24 and a position below the door pocket 30 to the fastening bracket 66. By providing such a door pocket cover 74, the fastening state of the fuel tank 64 can be appropriately maintained. This will be specifically described.

As described above, in this example, the door pocket 30 is provided inside the rocker 24. With this configuration, the rear door opening 12 can be extended to just above the rocker 24, and the opening of the rear door opening 12 can be made large. On the other hand, in the case of such an arrangement, the tank band 70 and the fuel tank 64 are located on the side of the lower rail 18 (more accurately, obliquely downward).

In this state, if the door pocket cover 74 is not provided, the lower rail 18 may collide with the tank band 70, and the tank band 70 and the fuel tank 64 may be damaged. That is, when the door pocket cover 74 is not provided, there is no barrier between the door pocket 30 and the tank band 70. In this case, if a side collision of the vehicle occurs, the lower rail 18 together with the door pocket 30 may largely move inward in the vehicle width direction or obliquely downward, and the door pocket 30 or the lower rail 18 may strongly hit the tank band 70. In general, the lower rail 18 has a relatively hard and durable structure so as not to be distorted even if it receives a force from the lateral roller 58. If the lower rail 18 collides with the tank band 70 or the like, the tank band 70 or the fuel tank 64 may be damaged.

In this example, as described above, the door pocket cover 74 is provided between the lower rail 18 (more accurately, the door pocket 30) and the tank band 70. Therefore, even if the door pocket 30 or the lower rail 18 tries to move toward the tank band 70 due to the side collision of the vehicle, the side surface of the door pocket 30 collides with the door pocket cover 74. Thus, the movement of the lower rail 18 and the door pocket 30 toward the tank band 70 is hindered or reduced, and the lower rail 18 is prevented from strongly colliding with the tank band 70 and the like. As a result, the tank band 70 and the fuel tank 64 are properly protected.

In addition, as described above, the rocker inner 46 is formed with the side opening 47 for allowing the door pocket 30 to project inward in the vehicle width direction. A slight gap is formed between the side opening 47 and the door pocket 30. If the door pocket cover 74 is not provided, this gap is exposed to the external space, and there is a risk that moisture or the like may enter the rocker 24 through the gap.

In this example, since the entire door pocket projecting portion 31 is covered with the door pocket cover 74, the side opening 47 is also hidden by the door pocket cover 74. As a result, water in the external space of the vehicle (for example, on the road surface) is prevented from entering the rocker 24 through the gap. That is, according to the present example, the door pocket cover 74 functions as a barrier that prevents the lower rail 18 from colliding with the tank band 70, and also functions as a water shut cover that prevents water from entering the rocker 24.

By the way, as is apparent from FIG. 2, in this example, the door pocket 30 is arranged below the outriggers 36. This is because the collision energy generated at the time of a side collision is efficiently dispersed. That is, in this example, the door pocket 30 and the outrigger 36 are vertically offset. Accordingly, the outriggers 36 can be arranged at substantially the same height position and substantially the same front-rear direction position as the cross member 38. In other words, the outriggers 36 and the cross members 38 can be arranged in almost one row.

Here, when the vehicle has a side collision, the collision load is transmitted from the rear door to the rocker 24. Without the outrigger 36, the collision load is not dispersed from the rocker 24 to other members, which may cause damage or breakage of the rocker 24. On the other hand, when the outriggers 36 aligned with the cross member 38 are provided, the collision load transmitted to the rocker 24 is further transmitted and dispersed to the cross member 38 via the outrigger 36 and the floor side member 34, and , And is also transmitted and distributed to the floor side member 34, the outrigger 36, and the rocker 24 on the opposite side via the cross member 38. That is, by providing the outriggers 36 aligned with the cross member 38, the collision load can be efficiently dispersed and transmitted to various frame members. As a result, partial concentration of the load is prevented, so that damage to the skeletal members such as the rocker 24 can be effectively prevented, and the vehicle interior is appropriately protected.

Note that the configurations described so far are merely examples, and at least the outriggers 36 are offset upward with respect to the lower rails 18 and are provided in positions substantially aligned with the cross member 38 in the vehicle width direction. For example, other configurations may be changed as appropriate.

10 front door opening, 12 rear door opening, 14 center pillar, 16 sliding door, 18 lower rail, 20 upper rail, 22 guide roller unit, 24 rocker, 30 door pocket, 31 door pocket protrusion, 32 floor panel, 34 floor side member, 36 Outrigger, 38 Cross Member, 44 Rocker Outer, 45, Side Opening Side Opening, 46 Rocker Inner, 54 Door Bag Upper, 56 Door Bag Lower, 58 Horizontal Roller, 60 Vertical Roller, 62 Lower Arm, 64 Fuel Tank, 66 Fastening Bracket, 68 Weld Nut , 70 tank bands, 72 fastening bolts, 74 door pocket cover.

Claims (1)

A pair of rockers that extend in the vehicle front-rear direction at the lower left and right sides of the passenger compartment,
Inside the vehicle width direction from the pair of rockers, a pair of floor side members extending in the vehicle front-rear direction,
A cross member spanned between the pair of floor side members,
An outrigger that is bridged between the rocker and the floor side member,
A lower rail for guiding the moving direction of the sliding door, the lower rail being provided at the same height position as the rocker, and a part of which projects inward in the vehicle width direction from the rocker,
Equipped with
The outrigger is provided at a position that is offset upward with respect to the lower rail and is substantially aligned with the cross member in the vehicle width direction.
A vehicle substructure characterized by the following.

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