JPH0635082U - Front suspension support structure - Google Patents

Abstract

(57) [Summary] [Purpose] To share the mainframe with 2WD vehicles,
The front suspension of the 4WD model will be sub-assembled so that both models can be mixed into the assembly line. [Constitution] The sub-frame assembly 2 is constructed by assembling the components of the front suspension and its peripheral components to sub-frame members such as two left and right lower frames 3, a front cross 4, a pipe cross 5 and a rear cross 6. The sub-frame assembly 2 has the lower frame 3 arranged on the lower surface of the flange of the main frame 1 so that the web 1a
Are bolted to each other via the bracket 3 or the like. The subframe assembly 2 side deals with the difference in the front suspension structure.

Description

[Detailed description of the device] [Industrial applications]

 The present invention relates to a front suspension support structure applied to a vehicle having a frame structure such as a truck, and more particularly to a front suspension support structure for a four-wheel drive vehicle that shares a main frame with a rear wheel drive vehicle.

[Prior art]

 In recent years, there has been an increasing demand for four-wheel drive vehicles (hereinafter referred to as 4WD vehicles) that have various merits not only on bottom μ roads and off-road roads but also on general roads. Such a flow has been extended to vehicles with frame structures such as trucks. However, the number of frame-structured vehicles produced is smaller than that of passenger cars, which are mainly monocoque structures, and the proportion of 4WD vehicles is still small. Therefore, in order to develop a truck 4WD vehicle at low cost, it is desirable to share the main parts with the rear-wheel drive vehicle (hereinafter referred to as 2WD vehicle) as much as possible.

[Problems to be solved by the device]

 By the way, if 4WD trucks are realized, rear wheel drive will be different from mainstream 2WD vehicles, and naturally the front wheels equipped with a steering mechanism will also be drive wheels. For this reason, it is necessary to change the front suspension, which mainly uses rigid suspensions using leaf springs, to an independent suspension system such as the double wishbone type. Therefore, it is difficult to attach the front suspension even if an attempt is made to realize 4WD by using the frame structure of a 2WD vehicle as it is. For example, a bent portion is provided on a linear main frame, or various brackets and reinforcing members are provided. However, there was a problem that it was forced to make a large design change such as adding. In addition, if a design change is made to simply use brackets and reinforcing members, a large man-hour difference will occur even if an attempt is made to assemble a 4WD vehicle in a mixed flow line with a 2WD vehicle, resulting in smooth operation of the assembly line. Not only becomes difficult, but also requires a large number of man-hours to ensure the assembly accuracy. Therefore, an object of the present invention is to provide a front suspension support structure which can be assembled on a mixed flow line by sharing a main frame with a 2WD vehicle and which can easily secure assembly accuracy and rigidity.

[Means for Solving the Problems]

 The present invention has been made to solve the above-mentioned problems, and in a front suspension support structure for a four-wheel drive vehicle in which the main frame is shared with a rear-wheel drive vehicle, an independent suspension type front surface is provided on the lower surface of the main frame. A front suspension support structure is characterized in that a subframe assembly having a suspension and peripheral components assembled therein is arranged, and the subframe assembly is bolted to the web surface of the main frame via a bracket.

[Action]

 According to the above-mentioned means, the 4WD can be realized by sharing the mainframe with the 2WD vehicle and connecting the subframe assembly in which the front suspension and the peripheral parts are assembled to the mainframe. Moreover, by preliminarily assembling the subframe assembly in a separate process, even if the 2WD vehicle and the 4WD vehicle are mixed in the assembly line, a large man-hour difference does not occur, and smooth line operation can be performed. Further, since it is only necessary to check the dimensional accuracy of the subframe assembly, accuracy control becomes easy.

【Example】

 An embodiment of a front suspension support structure according to the present invention will be described with reference to FIGS. Fig. 1 is a perspective view showing the left front wheel and the vicinity of a 4WD frame structure vehicle, which uses a double wishbone type independent suspension front suspension. This front suspension consists of two main frames 1 arranged in parallel (see Fig. 3) on the left and right, and a sub-frame assembly 2 joined together. This makes the rigid suspension using leaf springs a mainstream 2WD vehicle. Enables sharing of mainframe 1. That is, in the sub-frame assembly 2, two left and right lower frames 3 arranged on the lower surface of the flange of the main frame 1 are connected by three cross members, a front cross 4, a pipe cross 5 and a rear cross 6. The sub-frame member assembly is bolted to the web 1a of the main frame 1 via connecting brackets 7, 8 and 9. Further, the lower frame 3 described above is assembled via a bracket (for example, the upper arm bracket 14) provided with the lower arm 10, the upper arm 11, the shock absorber 12, the knuckle 13 and the like, which are components of the front suspension, as needed. It is attached. In addition to the front suspension, parts of the front wheel drive system, parts of the steering device, etc. may be assembled to the subframe assembly 2 described above. It may be determined in consideration of the overall configuration of the line and the difference in the front suspension peripheral structure between the 2WD vehicle and the 4WD vehicle. By the way, according to the front suspension support structure described above, the subframe assembly 2 is configured by mounting all the front suspension peripheral components associated with the 4WD implementation around the lower frame 3. For this reason, it is possible to assemble the front suspension peripheral part of a 4WD vehicle, which has a larger number of parts and a more complicated structure than the 2WD vehicle, in a separate process, and this subframe assembly 2 is used as a main frame in a mixed flow assembly line. By connecting to the wheel 1, the man-hours for assembling the front suspension of the 2WD vehicle and the 4WD vehicle can be set to be substantially the same. Moreover, with this type of sub-assembling, it is only necessary to check the dimensions of the essential parts of the sub-assembly assembly 2 as compared with the precision control by assembling each part while checking the dimensions on the assembly line. It becomes easier and the assembling accuracy can be improved. Also, since the front suspension is attached mainly to the lower frame 3, the lower frame 3 side can handle changes in the frame structure due to the difference in suspension system from the 2WD vehicle. It can be used almost completely and it is easy to deal with high rigidity. Reference numeral 15 is a positioning bolt for facilitating bolt connection to the web 1a when connecting the sub-frame assembly 2 to the lower surface of the flange of the main frame 1. Two positioning bolts are used for each of the left and right lower arms 3. Further, in the figure, 16 is a left front wheel, 17 is a front wheel hub, 18 is a differential, 19 is a tie rod end, 20 is a torsion bar, and 21 is an anchor support of the torsion bar 20.

[Effects of the Invention] According to the front suspension support structure of the present invention described above, it is possible to assemble both vehicle types in a mixed flow line by sharing the main frames of 2WD vehicles and 4WD vehicles having different front suspension structures. Moreover, assembling accuracy and rigidity can be easily ensured, which has a great effect on improving the product appeal of frame-structured vehicles such as trucks.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing an embodiment of the present invention.

FIG. 2 is a front view showing an example of the frame structure of FIG.

FIG. 3 is a plan view of FIG.

[Explanation of symbols]

 1 main frame 1a web 2 subframe assembly 3 lower frame 7,8,9 connecting bracket 10 lower arm 11 upper arm

Claims (1)

[Scope of utility model registration request] 1. A front suspension support structure for a four-wheel drive vehicle in which a main frame is shared with a rear-wheel drive vehicle,
A subframe assembly in which an independent suspension type front suspension and peripheral components are assembled is disposed on the lower surface of the mainframe, and the subframe assembly is bolted to the web surface of the mainframe via a bracket. A characteristic front suspension support structure.