JPH06127429A - Frame reinforcing construction - Google Patents

Abstract

PURPOSE:To reinforce the circumference of a suspension fitting part constituted by combining subframes which use mainframes with a 2WD vehicle and are fitted with a front suspension to main frames, so as to improve rigidity. CONSTITUTION:A front cross 8 is provided as a member combining through bolts 10 with brackets 9 downward projected from subframes 2 combined with main frames 1. Right and left front suspension lower arm front side supporting parts are connected to the front cross 8, and hence rigidity of the circumference is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame reinforcing structure around a front suspension mounting portion applied to a vehicle having a frame structure such as a truck, and in particular, an independent suspension type front suspension is mounted on a subframe. The present invention relates to a frame reinforcing structure.

[0002]

2. Description of the Related Art Recently, in addition to bottom μ roads and off-road,
There is an increasing demand for four-wheel drive vehicles (hereinafter referred to as 4WD vehicles) that have various merits even on general roads. Such a flow has been extended to a vehicle having a frame structure such as a truck.

However, the number of vehicles having a frame structure is smaller than the number of passenger cars mainly having a monocoque structure, and the proportion of 4WD vehicles is still quite small. For this reason, in order to develop a truck 4WD vehicle at low cost, the main components should be rear wheel drive vehicles (hereinafter 2WD) as much as possible.
It is desirable to share it with a car.

[0004]

By the way, when a 4WD truck is realized, unlike a 2WD vehicle in which the rear wheel drive is the mainstream, naturally, the front wheel provided with a steering mechanism also becomes the drive wheel. For this reason, it is necessary to change the front suspension, which is mainly a rigid suspension using leaf springs, to an independent suspension system such as a double wishbone type suspension. Therefore, 2W
Even if an attempt is made to realize 4WD by using the frame structure of the D car as it is, it becomes difficult to attach the front suspension. For example, as shown in FIG. 5, the sub suspension in which the front suspension of the independent suspension system is attached to the lower surface of the flange of the main frame 1 A structure in which the frame 2 is arranged and connected to the web 1a can be considered.

However, although such a front suspension mounting structure has the advantages that the main frame 1 can be shared with a 2WD vehicle and that no major design changes in the peripheral parts are required, the suspension mounting position is the main. The offset amount becomes large away from the frame, and there arises a problem of insufficient rigidity that affects steering stability and the like. That is, the front end side of the main frame 1 to which the sub frame 2 is coupled has a structure of an open cross section in a plan view as shown in FIG. 6, and an input from a front suspension having a large offset amount to such a main frame 1. Is activated,
The amount of frame deformation may be large, which may adversely affect steering stability.

Therefore, an object of the present invention is to increase the rigidity of the periphery of the front suspension mounting portion by the sub-frame, increase the strength of the front suspension mounting portion and improve the steering stability.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a subframe disposed on the lower surface of a main frame is connected to a web surface, and an independent suspension type suspension is attached to the subframe. In the frame reinforcing structure around the front suspension mounting portion to which is attached, a member for connecting left and right lower arm supporting portions of the front suspension is provided, which is a frame reinforcing structure.

[0008]

According to the above-mentioned means, since the member for connecting the lower arm supporting portion of the front suspension to the left and right is provided, the periphery of the front suspension mounting portion has a closed cross-section in plan view, and the rigidity of the front suspension mounting portion is improved. To do.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the frame reinforcing structure according to the present invention will be described with reference to FIGS.

FIG. 1 is a plan view showing a frame structure around a front suspension mounting portion of a 4WD truck, in which two main frames 1 are arranged in parallel in the longitudinal direction of a vehicle body, and flanges of both main frames 1 are arranged. Subframes 2 each having a front suspension assembled are arranged on the lower surface, and are joined to the web surface 1a by bolts via members 3, 4, 5 and the like. The sub-frame 2 is provided with a rear cross 6 and a pipe cross 7 as members for connecting the left and right, and is further reinforced by adding a front cross 8 so that the plan view has a closed cross-section.

The front cross 8 is a sub frame 2
2 are respectively connected to brackets 9 projecting downwards from each other by two bolts 10. Further, the bracket 9 includes
As shown in FIGS. 3 and 4, the lower arm 1 constituting the double wishbone type front suspension.
1 is supported. For this reason, the front support portion 11a of the lower arm 11 is provided with the front cross 8 and the rear support portion 11b is also provided with the rear cross 6, thereby reinforcing the input portion from the suspension.

In the figure, 12 is an upper arm, 13 is a knuckle, 14 is a shock absorber, 15 is a torsion bar, 16 is a front wheel, and 17 is a differential.

The operation of the frame reinforcing structure described above will be described below. According to this reinforcing structure, since the front cross 8 is added to connect the front support portion 11a of the lower arm 11 to the left and right, the rear cross 6 which has been provided conventionally cooperates with the rear support portion 11b. Then, the front suspension mounting portion has a closed cross-sectional structure in plan view.
Therefore, even if a large input is applied to the suspension supporting portion, the main frame 1 alone does not have to deal with this, but a high-rigidity closed cross-sectional structure configured with both the cross members of the rear cross 6 and the front cross 8 can handle it. Like In particular, since both cross members effectively function with respect to input and twist in the vehicle width direction, the main frame 1 is effectively reinforced. Therefore, even if the amount of offset with respect to the main frame 1 is increased by adopting the structure in which the subframe 2 with the front suspension is attached to the mainframe 1, the strength of the front suspension attachment portion can be increased and the amount of frame deformation is reduced. .

Further, since the front cloth 8 is connected by the bolts 10, it can be easily attached and detached when various maintenance work is performed from the lower side of the vehicle body, and the added front cloth 8 does not hinder the work. Absent. The front cross 8 can be assembled in advance to the subframe 2 together with the front suspension, and an assembly in which these are integrated can be collectively coupled to the mainframe 1 in the assembly line. Therefore, even in an assembly line in which a 2WD vehicle and a 4WD vehicle are mixed, there is no great difference in assembly time.

[0015]

According to the above-described frame reinforcing structure of the present invention, the rigidity of the front suspension mounting portion by the sub-frame system is improved, and the strength of the front suspension mounting portion is increased and the steering stability is improved.

Further, without causing a significant increase in cost due to a large design change or construction of a new assembly line,
Since the main frame of a 4WD vehicle, which has a small production volume, can be shared with a 2WD vehicle, it has a great effect on the improvement of the marketability.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a frame reinforcing structure according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a plan view showing an example of a front suspension structure.

FIG. 4 is a perspective view showing a peripheral structure of a front suspension.

FIG. 5 is a front view showing a conventional example.

FIG. 6 is a plan view of FIG.

[Explanation of symbols]

 1 Main Frame 2 Sub Frame 6 Rear Cross 8 Front Cross 11 Lower Arm 12 Upper Arm

Claims (1)

[Claims] 1. A frame reinforcing structure around a front suspension mounting portion in which a sub-frame disposed on a lower surface of a main frame is coupled to a web surface, and an independent suspension type suspension is mounted on the sub-frame, wherein a lower arm support portion of the front suspension is provided. A frame reinforcing structure characterized in that a member for connecting left and right is provided.