JPH04189682A - Strut bar installation structure for side rail - Google Patents

Abstract

PURPOSE:To support a load inputted on a side rail securely by integrally providing a bracket part for installing a strut bar by extending a vehicle, front side surface to be lower than a mount part of a side rail upper part on the front side of a vehicle. CONSTITUTION:A suspension arm 10 supporting a tire 12 is fixed to a side rail 14 at a body side end, and this side rail 14 is formed of an almost U-shaped side rail upper part 16 opening under a vehicle, and an almost U-shaped side rail lower part 18 to have a closed cross section as a whole. The side rail 14 has a hole 20 close to a vehicle front side end part, and a body mount is contained here. Both side surfaces of the side rail upper part 16 extended on the front side of the body mount is extended to be lower than the vehicle, and the extended part is used as a bracket part 38 of a strut bar 42. An end part of a strut bar 42 is pivotally supported at a hole 40 formed at the extended part 38.

Description

[Detailed Description of the Invention] Field of Industrial Application] The present invention provides a strut bar that is connected between a side rail of a vehicle and a tire support portion and supports a load in the longitudinal direction of the vehicle inputted from the tire, to the side rail. This invention relates to a side rail strut bar mounting structure for mounting.

[Prior Art] As described above, a bracket 52 is attached to the lower part of the vehicle front side portion of the side rail 50, and a strut stopper 54 (referred to as a radius arm in the above-mentioned publication) is connected to the bracket 52.

While the vehicle is running, loads from the tires in the longitudinal direction of the vehicle are input. This load is transmitted to the side rail 50 via the strut bar 54 and can be supported by the side rail 50.

[Problem to be solved by the invention]

However, although the vehicle longitudinal direction load is input to the side rail 50 from the strut bar 54 via the bracket 52, the bracket mounting position is structurally offset in the vehicle width direction with respect to the body mounting position of the side rail 50. Therefore, a moment force centered on the body mount portion is applied to the mounting position of the strut bar 54 of the bracket 52. Therefore, since the load is concentrated on the joint between the bracket 52 and the side rail 50, this joint is required to have high joint rigidity, such as by increasing the wall thickness of the side rail 50.

In consideration of the above facts, the present invention aims to provide a side rail strut bar mounting structure that does not require high joint rigidity and can reliably support the load input to the side rail.

[Means to solve the problem]

A side rail strut bar mounting structure according to the present invention is for attaching a strut bar to the side rail, which is connected between a side rail mounted on a vehicle and a tire wheel, and supports a vehicle longitudinal direction load input from the tire wheel. The side rail strut bar mounting structure includes a side rail upper having a substantially U-shaped cross section with an opening on the surface facing downward of the vehicle, and a side rail lower joined so as to close the opening surface of the side rail upper. and a bracket portion to which the strut bar is connected is formed on both side surfaces of the side rail upper on the front side of the vehicle beyond a mount portion on the front side of the vehicle that extends downwardly of the vehicle. It is characterized by

(Function) According to the present invention, the side rail has a closed section structure with the upper side rail and the lower side rail, so it has high rigidity.Furthermore, the bracket part for attaching the strut bar is attached to the upper side rail. Since the side surface on the front side of the vehicle extends downward from the vehicle front side than the mount part on the front side of the vehicle, the load from the strut bar is directly transmitted to the side rail with a closed cross-section structure, and the mount part Even if a moment force is applied to the center, the load can be reliably supported.

(Example) FIGS. 1 and 2 show the rear part of a vehicle according to this example. Suspension arm 1 is attached to this rear part.
0 supports a tire 12 attached to a tire wheel (not shown). The suspension arm 10 has one end on the body side fixed to a side rail 14.

As shown in FIG. 3(A), the side rail 14 includes a substantially U-shaped side rail upper 16 with an open surface facing downwards of the vehicle, and a substantially U-shaped side rail upper 16 with an open surface facing upwards of the vehicle. It is composed of a U-shaped side rail lower 18. The side rail upper 16 and the side rail lower 18 are joined with their opening surfaces facing each other.

Therefore, the side rail 14 has a closed cross-sectional shape as a whole (see FIGS. 3(B) and 3(C)).

The side rail 14 is provided with a circular hole 20 having an inner wall near the end on the vehicle front side, and a body mount 22 is housed therein as shown in FIG. The side rail 14 is suspended and fixed to a rear floor side member 24 via this body mount 22. The body mount 22 includes a cylindrical rubber bush 26, a cylindrical shaft portion 28A housed in this cylinder, and this shaft portion 2.
8A, and a main shaft 28 formed of a flange portion 28B formed at one end. A through hole 30 is formed in the rear front side member 24, and a flange 3 formed in a columnar mount support member 32 around the through hole 30.
2A is connected.

This mount support member 32 is connected to the body mount 22.
A circular hole is formed in the end face opposite to , and a female thread 34 is formed. This mount support member 32 is accommodated in the cylinder of the body mount 22, and a bolt 36 is inserted from the flange portion 28B side and screwed into the female thread 34, thereby attaching the side rail 14 to the rear floor side member 24. .

A body mount 37 for coupling to a rear cross member (not shown) is attached to the vehicle rear end of the side rail 14, and the front LF suspension arm 10 is attached to the side rail 14 between this body mount 37 and the body mount 22. is fixed. Further, the side rail upper 16, which extends further forward than the vehicle front side body mount 22, has both side surfaces extended downwardly of the vehicle, and these extensions are parallel to each other, and are connected to the bracket portion of the strut bar 42, which will be described later. It is said to be 38. Circular holes 40 parallel to each other are formed in the extension portion 38, and a body side end portion of a strut par 42 constituting a part of the rear suspension is attached via a shaft. strut par 42
is linear along the longitudinal direction of the vehicle, and has the role of supporting the load transmitted from the tires in the longitudinal direction of the vehicle while the vehicle is running, especially during acceleration and deceleration.

For this reason, it is preferable that the strut par 42 be disposed so that its axis coincides with the longitudinal direction of the vehicle or passes through the vehicle front side body mount 22, but due to its structure, it is slightly It is inclined in the vertical and horizontal directions of the vehicle and is offset from the body mount 22 by a dimension r in FIG. Therefore, when a load is applied to the strut par 42 in the longitudinal direction of the vehicle, this load and a moment force centered on the body mount 22 are applied to the mounting portion of the strut par 42 of the bracket portion 38. In this embodiment, since the bracket portion 38 is integral with the side rail 14 and has a closed cross section, the load and moment force are directly supported by the side rail 14.

The operation of this embodiment will be explained below.

When the vehicle accelerates and decelerates while the vehicle is running, loads in the longitudinal direction of the vehicle are transmitted from the tires 12 to the bracket portions 38 of the side rails 14 via the strut pars 42. The strut par 42 is inclined with respect to the vehicle vertical and horizontal directions, and is attached to the vehicle front side body mount 2 of the side rail 14.
2 by a dimension l. Therefore, when the load is applied to the strut par 42, this load generates a moment force centered on the body mount 22, which causes a force to bend the bracket portion 38 of the side rail 14 located on the front side of the vehicle relative to the body mount 22. It works. Here, in this embodiment, the bracket part 38
is integrated with the side rail 14 and has no joints,
It can be supported directly by the side rails 14.

Furthermore, since the side rail 14 has a closed cross section with the side rail upper 16 and the side rail lower 18,
It has high rigidity, and the bracket portion 38 will not be deformed.

Therefore, there is no need for high joint rigidity with the side rail 14 when the bracket part 38 is separate, and the load and moment force input to the side rail 14 can be reliably supported, and the side rail 14 weight reduction can be measured.

In addition, in this embodiment, when connecting the side rail lower 18 to the side rail upper 16, the side rail lower 18
Although the side rail lower 18 has a substantially U-shaped cross section with an opening at the top of the vehicle, as shown in FIG. 4, the side rail lower 18 may have a substantially U-shaped cross section with an opening at the bottom of the vehicle. In this case, the bracket part 38 is connected to the side rail upper 16 and the side rail lower 1.
8 can be formed in a polymerized state, resulting in even higher rigidity.

In addition, the side rail upper 16 and the side rail lower 18
Although the side rail upper 16 was arranged to be on the outside when coupled with the side rail lower 1 as shown in FIG.
They may be combined so that 8 is on the outside. In this case, it is necessary to provide a slit hole 44 on the vehicle front side of the vehicle front side body mount 22 of the side rail lower 18 and pass the side rail upper 16 through this slit hole 44 to form the bracket part 38.

Furthermore, in this embodiment, the strut par 4 at the rear of the vehicle
2 and the side rail 14 is shown, but the present invention is also applicable to a connection structure between a strut par at the front of a vehicle and a side rail.

〔Effect of the invention〕

As explained above, the side rail strut bar mounting structure according to the present invention has the excellent effect of being able to reliably support the load input to the side rail without requiring high joint rigidity.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the rear part of the vehicle according to this embodiment, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 (A) is a perspective view showing the front side of the vehicle of the side rail. , Figure 3CB) is the third
I[1B-I[IB line sectional view in Figure (A), Figure 3(C)
is Fig. 3(A) (7) II[C-I[[C-line sectional view,
FIGS. 4 and 5 are cross-sectional views of a side rail as viewed from the front and back direction of the vehicle, showing a modified example of the connection between an upper side rail and a lower side rail, and FIG. 6 is a perspective view of a conventional side rail. 14... Side rail, 16... Side rail upper, 18... Side rail lower, 22... Body mount, 38... Bracket part, 42... Strut bar.

Claims (1)

[Claims] (1) A side rail strut bar mounting structure for attaching to the side rail a strut bar that is connected between a side rail mounted on a vehicle and a tire wheel and supports a vehicle longitudinal load input from the tire wheel. , a side rail upper having a substantially U-shaped cross section with an open surface facing downward of the vehicle, and a side rail lower joined to cover the opening surface of the side rail upper, A strut bar of a side rail, characterized in that both side surfaces on the front side of the vehicle from a mount part on the front side of the vehicle are integrally extended below the vehicle to form a bracket part to which the strut bar is connected. Mounting structure.