JP5050759B2 - Car bounce stopper mounting structure - Google Patents

Description

  The present invention relates to a mounting structure for a bound stopper that regulates relative movement in the vertical direction between an axle housing supported by a leaf spring suspension of an automobile and a lower portion of a vehicle body.

Conventionally, some commercial van type vehicles have a leaf spring suspension as a rear suspension for supporting a rear tire.
As shown in FIGS. 6 and 7, the leaf spring suspension of this type of vehicle has a front end 31 and a rear end 32 below a rear side member 2 extending in the front-rear direction along the lower surface of the cargo compartment floor 1 of the vehicle body. The structure is such that an axle shaft housing (axle housing) 8 that connects the left and right rear tires 9 to the central part of the connected leaf springs 3 in the front-rear direction is movably supported.

In this type of rear suspension, when the axle housing 8 and the rear side member 2 move relative to each other in the vertical direction and approach each other due to vibration during vehicle travel and load loading, the two 8, 2 do not collide directly. Thus, a bound stopper 4 made of a rubber block body is provided on the lower surface of the rear side member 2 (see Patent Document 1), and the axle shaft 8 is received by the bound stopper 4. Patent Document 1 describes the structure of a single bound stopper.
JP 2004-225799 A

  However, in the conventional structure, since the bound stopper 4 is installed on the lower surface of the rear side member 2, the vertical dimension of the rear side member 2, the vertical dimension of the bound stopper 4, and the bound stopper 4 and the axle housing 8 are provided below the floor of the cargo compartment. A vertical dimension is required to ensure the stroke of the suspension in between, the floor surface of the cargo compartment becomes high, and it is difficult to load and unload luggage.

Therefore, in order to lower the cargo floor 1 in order to improve the workability of loading and unloading luggage, it is conceivable to reduce the vertical dimension of the rear side member 2 and the vertical dimension of the bound stopper 4, but the rigidity of the rear side member 2 is reduced. The impact mitigating performance of the bound stopper 4 is reduced, and when the axle housing 8 strongly collides with the bound stopper 4 due to a strong thrust from the road surface when the vehicle is traveling, the cargo compartment floor 1 may be pushed up and deformed. Therefore, it is difficult to reduce the vertical dimension of the rear side member 2 and the bound stopper 4.
In addition, if the stroke size of the suspension is reduced, riding comfort performance is degraded.

  Accordingly, an object of the present invention is to provide an automobile bound stopper mounting structure capable of lowering the height position of the floor panel of the vehicle body without reducing the vertical dimension of the side member and the bound stopper and the stroke length of the suspension. It was made.

The present invention is provided in a lower part of a vehicle body above and facing an axle housing supported by a leaf spring suspension of an automobile so as to be movable up and down, and the axle housing and the lower part of the vehicle body are moved relative to each other in the vertical direction. In a vehicle bounce stopper mounting structure having a bounce stopper made of a rubber block body that abuts against the axle housing and restricts the relative movement when approaching, the lower part of the vehicle body is longitudinally along the lower surface of the floor panel. A side member that extends and forms a closed cross section with the floor panel, and is adjacent to the side member to form a box cross section with the lower surface of the floor panel and the upper half of the side surface of the side member, and the lower surface of the side member A stopper mounting member set at a position one step higher than the lower surface is provided, and the stopper mounting member On the lower surface, attaching the bound stopper projecting downward from the side members (claim 1).
A stopper mounting member that is integrated with the floor panel and the side member, has high rigidity, and has a lower surface that is one step higher than the lower surface of the side member, and a bound stopper is mounted on the lower surface of the stopper mounting member. The floor panel can be made lower than the conventional structure provided on the lower surface.

The stopper mounting member comprises three vertical walls having a U-shaped horizontal cross section and a bottom wall connecting the lower edges of the vertical walls. A flange formed on the upper edge of the vertical wall is provided on the lower surface of the floor panel. In addition, the flange formed on the side edge of the bottom wall is fixed to the side surface of the side member, and the bound stopper is attached to the lower surface of the bottom wall.
It is suitable as a stopper mounting member having a box cross section with the floor panel and the side member.

The side member is installed at a position inside the vehicle spaced from the side edge of the floor panel to which the lower edge of the vertical wall-shaped side wall portion of the wheel house is joined. The stopper mounting member is installed at the side end between the members. A reinforcing member having a closed cross section with the side wall portion is provided along the lower edge of the side wall portion of the wheel house.
Since the rigidity of the side wall portion of the wheel house along the side edge of the floor panel is reinforced, the rigidity of the side end portion where the stopper mounting member is installed on the floor panel is reinforced.

A reinforcing plate is overlaid on the side edge of the floor panel.
The rigidity of the side edge of the floor panel is further strengthened.

  An embodiment in which the present invention is applied to a leaf spring type rear suspension of a commercial van type vehicle will be described. The rear suspension has the same basic structure as the conventional structure. The front and rear ends of the leaf springs extending in the front-rear direction are connected to the lower surface of the vehicle body, and the axle housing that supports the wheels at the front and rear center portions of the leaf springs is moved up and down. The structure is supported so as to be movable in the direction. The rear suspension has the same structure on the left and right, and the following description will focus on one structure on the left and right with reference to the drawings.

  As shown in FIGS. 1 to 3, the floor panel 1 forming the lower surface of the vehicle body is formed in a substantially horizontal flat plate shape, and a rear wheel house 7 is provided on the outer side in the vehicle width direction. The side edge of the rear wheel house 7 is connected to the lower edge of the side wall 71 that forms the vertical wall of the rear wheel house 7.

On the lower surface of the floor panel 1, a rear side member 2 extending in the front-rear direction is provided at a position spaced from the side edge coupled to the lower edge of the side wall portion 71 toward the vehicle interior. The rear side member 2 has a substantially reverse hat shape in cross section comprising a horizontal bottom surface portion 21 and left and right side surface portions 22a and 22b which are bent from the left and right side edges of the bottom surface portion 21 and rise upward. The upper edge flanges 22b are connected to the lower surface of the floor panel 1 to form a closed cross-sectional structure with the floor panel 1.
On the lower surface of the floor panel 1, a plurality of cross members 20, 20,... (FIG. 1) extending in the vehicle width direction are provided between a pair of left and right rear side members.

A reinforcement 6 is provided on the side wall 71 of the rear wheel house 7 so as to extend in the front-rear direction in the wheel house along its lower edge. The reinforcement 6 has a substantially hat-shaped cross section that opens toward the inside of the vehicle. The upper edge flange and the lower edge flange are overlapped and fixed to the outer surface of the side wall 71, respectively. Eggplant.
Since the side edge of the floor panel 1 is located away from the rear side member 2, a reinforcement 6 as a reinforcing member is provided to reinforce the side edge of the floor panel 1, thereby lowering the side wall 71 of the rear wheel house 7. The rigidity of the side end portion 11 of the floor panel 1 located between the edge and the rear side member 2 is enhanced. At the same time, the rigidity of the side wall 71 of the wheel house 7 is also improved.

  On the lower surface of the side end portion 11 of the floor panel 1, a bound stopper 4 that receives the axle housing 8 via a stopper mounting member 5 is installed at a position corresponding to the center in the front-rear direction of the rear wheel house 7. .

  The stopper mounting member 5 is a molded product obtained by bending a metal plate, and is a rectangular rectangle in plan view that connects three vertical walls 52, 53, 54 having a U-shaped horizontal cross section and the lower edges of these vertical walls 52, 53, 54. And is formed in a semi-container shape having an upper portion and one side opening. The height of the stopper mounting member 5 is lower than that of the rear side member 2 and is about one-half that of the rear side member 2.

The stopper mounting member 5 is formed with an upper edge flange 55 bent at the upper edge of each of the vertical walls 52, 53, 54 in the outer peripheral direction, and the vertical walls 52, 53 on both sides have the vertical side of the opening side. Side edge flanges 56 and 56 are formed at the edges, respectively.
Further, the stopper mounting member 5 is formed with a lower edge flange 57 formed in a substantially L-shaped cross section with a vertical surface portion bent downward from the lower edge of the bottom wall 51 and a horizontal surface portion bent from the lower edge. It is.

  A plan view of the main body of the stopper mounting member 5 excluding the lower edge flange 57 is formed on the side end portion 11 of the floor panel 1 in the form of a metal plate over substantially the entire width of the side end portion 11 from the wheel house 7 to the rear side member 2. A reinforcing plate 50 that is slightly larger than the outer shape is superposed and fixed.

  The stopper mounting member 5 has the vertical wall 54 at the center as the outside of the vehicle, and the upper edge flange 55 of each vertical wall 52, 53, 54 is overlapped and fixed to the lower surface of the reinforcing plate 50, and the vertical walls 52, 53 on both sides are fixed. The side edge flanges 56 and 56 are overlapped and fixed to the upper half of the side surface portion 22a of the rear side member 2, and the side end portion 11 of the floor panel 1 and the side surface portion 22a of the rear side member 2 are closed in the front-rear direction and in the front and rear ends. The box cross-sectional structure is made. Further, the vertical surface portion and the horizontal surface portion of the lower edge flange 57 of the stopper mounting member 5 are overlapped and fixed to the lower half portion of the side surface portion 22 a of the rear side member 2 and the bottom surface portion 21 of the rear side member 2.

  The stopper mounting member 5 has the bottom wall 51 lower surface formed higher than the bottom surface portion 21 of the rear side member 2 by a height dimension S as a mounting seat, and the bound stopper 4 is mounted on the bottom wall 51 lower surface. The bound stopper 4 is a rubber block having the same height as that of the conventional structure, and a shallow cross-section metal plate 41 is insert-molded at the top.

The bound stopper 4 is fixed by bolting by attaching attachment portions at both ends of the metal plate 41 projecting forward and backward from the upper edge of the front surface and the upper edge of the rear surface to the both front and rear positions of the bottom surface of the bottom wall 51 from below.
The lower surface of the bound stopper 4 protrudes below the rear side member 2, and the lower surface faces the axle housing 8 at a predetermined interval in the vertical direction. The lower part of the vehicle body (the floor panel 1 and the rear side member 2) When the axle housing 8 and the axle housing 8 are relatively moved in the vertical direction and come close to each other, the bound stopper 4 and the axle housing 8 come into contact with each other so that the axle housing 8 and the rear side member 2 do not come into contact with each other.
The leaf spring 3 has front and rear ends (not shown) connected to front and rear cross members which are frame members of the vehicle body provided on the vehicle outer side than the rear side member 2 at the front and rear side positions of the wheel house 7, respectively. The side panel of the floor panel 1 and the lower position of the bound stopper 4 are installed in the front-rear direction.

According to this embodiment, the stopper mounting member 5 is attached to the side end portion 11 of the floor panel 1 between the lower edge of the side wall portion 71 of the rear wheel house 7 and the rear side member 2 provided at the inner side of the vehicle. Since the mounting seat surface (bottom wall 51) is provided at a position one step higher than the bottom surface portion 21 of the rear side member 2 (height dimension S) and the bound stopper 4 is attached thereto, the lower surface of the bound stopper 4 and the axle Since the same vertical stroke dimension as that of the conventional structure is secured between the housing 8 and the vertical dimension of the bound stopper 4 can be set large, the impact mitigation performance when the axle housing 8 collides is improved. The height position of 1 can be made lower by the height dimension S than the conventional structure (the phantom line in FIG. 2). Therefore, loading and unloading work can be facilitated.

When the bound stopper 4 and the axle housing 8 are in contact with each other, a thrust load is applied upward to the stopper mounting member 5 and the side end portion 11 of the floor panel 1 through the bound stopper 4. Since the box section is formed by the side end portion 11 of the floor panel 1 and the side surface portion 22a of the rear side member 2, rigidity against the load can be ensured.
Further, the thrust load acts on the side end portion 11 of the floor panel 1 from the stopper mounting member 5, but the side end portion 11 is rigid with respect to the above load by reinforcement by the reinforcement 6 provided along the lower edge of the rear wheel house 7. Ensure sufficient.
Depending on the thickness of the floor panel 1 and the width dimension of the side end portion 11, the reinforcing plate 50 is provided in order to hold the rigidity against the load even more reliably.

  In the above-described embodiment, the stopper mounting member 5 is formed of an integral molded product. However, the present invention is not limited to this, and the stopper mounting member 5 may be formed of two parts. Another embodiment of the present invention in which the stopper mounting member is composed of two parts will be described with reference to FIGS. The basic structure of the present embodiment is substantially the same as that of the previous embodiment, and differences will be mainly described. In the drawings, the same members are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIGS. 4 and 5, the stopper mounting member 5 </ b> A includes a first member 5 b that integrally includes a bottom wall 51 and a central vertical wall 54, and integrally includes vertical walls 52 and 53 on both sides. A combination with the second member 5c.
The first member 5b includes a bottom wall 51 that forms a mounting seat, a vertical wall 54 and an upper edge flange 55 that erect from one end edge of the first member 5b, and a vertical surface portion that extends downward from the other end edge of the bottom wall 51. And a lower edge flange 57 composed of a horizontal surface portion and formed in a step-like plate shape.
The first member 5b is integrally formed with reinforcing vertical ribs 58, 58 that connect the end walls on both sides of the bottom wall 51 and the vertical surface portion of the lower edge flange 57 in a triangular shape.

  The second member 5c has an inverted hat shape with an open top, and includes vertical walls 52 and 53 on both sides, a bottom wall 59 connecting these lower edges in the front-rear direction, and front and rear upper edge flanges 55 and 55. It is integrally formed. The second member 5c has an outer dimension of the bottom wall 59 that matches the bottom wall 51 of the first member 5b.

  The first and second members 5b and 5c overlap the bottom wall 59 of the second member 5c from above on the upper surface of the bottom wall 51 of the first member 5b, and the vertical walls 52 on both sides of the second member 5c. 53, coupling flanges 541 and 541 projecting in the form of tongues from the vertical edges on both sides of the central vertical wall 54 of the first member 5b are overlapped and fixed. The two members 5b and 5c are combined to form a semi-container shape having an upper side and one side opened.

Further, in this embodiment, the reinforcing plate 50A is formed in a shallow cross-section inverted hat shape, and includes a coupling flange 501 on the outer periphery.
The reinforcing plate 50A is fixed by overlapping the connecting flange 501 on the lower surface of the side end portion 11 of the floor panel 1, and by connecting the side edge on the vehicle inner side to the side surface portion 22a on the vehicle outer side of the rear side member 2. The section 11 and the side surface portion 22a of the rear side member 2 form a box cross-sectional structure.

The stopper mounting member 5A superposes the upper edge flanges 55, 55, 55 of the first member 5b and the second member 5c on the temporary surface of the reinforcing plate 50A, and also fixes the vertical walls 52, 53 of the second member 5c. The side edge flanges 56 and 56 are overlapped and fixed to the upper half of the side surface portion 22a of the rear side member 2, and the reinforcing plate 50A of the floor panel 1 and the side surface portion 22a of the rear side member 2 form a box cross-sectional structure. Further, the lower edge flange 57 of the first member 5 b is overlapped and fixed to the lower half portion of the side surface portion 22 a of the rear side member 2 and the bottom surface portion 21 of the rear side member 2. The bound stopper 4 is fastened to the bottom wall 51 as in the previous embodiment.
Note that the height of the stopper mounting member 5A is set lower than that of the stopper mounting member 5 of the previous embodiment because the reinforcing plate 50A has a box cross-sectional structure.

According to this embodiment, the floor panel can be lowered by the same effect as the previous embodiment, and the stopper mounting member 5A has a divided structure composed of the first and second members 5b and 5c. Molding is facilitated, and the reinforcing vertical ribs 58, 58 are provided on the bottom wall 51 of the first member 5b, so that the load acting on the stopper mounting member 5A from the bound stopper 4 is applied to both the reinforcing vertical ribs 58, 58. It can be efficiently dispersed to the rear side member 2 side, and the rigidity of the stopper mounting member 5A with respect to the load is further improved.
Further, since the reinforcing plate 50A has a box cross-sectional structure, the rigidity of the side end portion 11 of the floor panel 1 against the load can be further enhanced.

It is a principal part perspective view which shows the bound stopper attachment structure of this invention. It is sectional drawing which follows the II-II line of FIG. It is a principal part side view of the said bound stopper attachment structure. It is a perspective view of the stopper attachment member used for other embodiments of the present invention. It is sectional drawing which follows the VV line of FIG. It is a schematic side view showing a leaf spring type suspension of an automobile. It is a schematic explanatory drawing which shows the attachment position of the conventional bound stopper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Floor panel 11 Side edge part 2 Side member 21 Bottom face part (lower surface)
22a Side (side)
3 Leaf spring 4 Bound stopper 5 Stopper mounting member 50, 50A Reinforcement plate 51 Bottom wall (lower surface)
52, 53, 54 Vertical wall 55, 56, 57 Flange 6 Reinforcement (reinforcing member)
7 Wheelhouse 71 Side wall

Claims (4)

Opposite to an axle housing that is supported by a leaf spring suspension of an automobile so as to be movable up and down, it is provided in the lower part of the vehicle body above it, and when the axle housing and the lower part of the vehicle body move relative to each other in the vertical direction and approach each other In the bound stopper mounting structure of an automobile provided with a bound stopper made of a rubber block body that contacts the axle housing and restricts the relative movement,
The lower portion of the vehicle body extends in the front-rear direction along the lower surface of the floor panel, and includes a side member that forms a closed section with the floor panel,
Adjacent to the side member, a box cross section is formed between the lower surface of the floor panel and the upper half of the side surface of the side member, and a stopper mounting member is provided in which the lower surface is set at a position higher than the lower surface of the side member,
A bound stopper mounting structure for an automobile, wherein the bound stopper projecting downward from the side member is mounted on the lower surface of the stopper mounting member.   The stopper mounting member comprises three vertical walls having a U-shaped horizontal cross section and a bottom wall connecting the lower edges of the vertical walls. A flange formed on the upper edge of the vertical wall is provided on the lower surface of the floor panel. 2. The bound stopper mounting structure for an automobile according to claim 1, wherein a flange formed on a side edge of the bottom wall is fixed to a side surface of the side member, and the bound stopper is attached to a lower surface of the bottom wall. The side member is installed at a position inside the vehicle spaced from the side edge of the floor panel to which the lower edge of the vertical wall-shaped side wall portion of the wheel house is joined.
In the floor panel, the stopper mounting member is installed at the side end between the side edge and the side member,
The side wall of the wheel house is provided with a reinforcing member having a closed cross section with the side wall along the lower edge,
The bound stopper mounting structure for an automobile according to claim 1 or 2, wherein the rigidity of the side end portion is reinforced against an impact load acting on the side end portion of the floor panel from below via a bound stopper and a stopper mounting member.   A reinforcing plate is overlapped on the side end of the floor panel, and the rigidity of the side end is reinforced against an impact load acting on the side end of the floor panel from below via a bound stopper and a stopper mounting member. A bound stopper mounting structure for an automobile according to claim 3.

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