JPH0115574Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a trailing arm type rear suspension of a vehicle that is equipped with a subframe that is different from the chassis frame. This invention relates to a mounting device for hanging installation.

[Conventional technology]

Conventionally, regarding this type of trailing arm type suspension with a subframe, there is a prior art described in, for example, Japanese Utility Model Application Publication No. 54-120020, which describes an arm support to which a trailing arm is attached. The shaft is supported on the vehicle body at two locations on both ends.

However, with this configuration, it is not possible to ensure rigidity for supporting the entire suspension including the arm support shaft. Also, although a bush is interposed between the arm support shaft and the brackets at both ends,
Since this bushing is a simple ring-shaped bushing, there are problems in that it cannot exhibit sufficient performance in terms of steering stability, ride comfort, etc.

However, as an example of prior art useful for solving this problem, there is one described in Japanese Utility Model Publication No. 58-48277, which describes the following configuration: Clamping plates placed opposite each other with a certain gap on the upper and lower surfaces of the detant pipe are connected via a detant pipe, and these are fixed to the vehicle body with bolts passing through the pipe. The inner circumferential surface of a cylindrical bushing is bonded to the outer circumferential surface, and the outer circumferential surface is tightly fitted into a vertical support hole provided in the subframe, and is protruded from the lower surface of the bushing and the upper clamping plate. A subframe support device is described in which an inward flange protruding from the upper end periphery of the support hole is sandwiched between buffer ribs, and gaps are formed adjacent to the upper and lower surfaces of the bush.

[The problem that the idea aims to solve]

However, the support device of the prior art example has a problem in that the structure of the bush for fixing the subframe to the vehicle body is extremely complicated and the number of parts increases.

[Means to solve the problem]

The present invention aims to solve the above problems and has the following means.

In a vehicle that configures a trailing arm type suspension on a subframe different from the chassis frame, two vehicle body mounting brackets are installed perpendicularly to the subframe, and the four locations at both the front and rear ends of each bracket are attached in the front-rear direction. A cylindrical body for inserting bolts in the longitudinal direction is disposed in the center of a U-shaped mounting bracket which is inserted between support plates fixed at intervals and is suspended from the vehicle body side, and It is connected to the mounting bracket by inserting a bolt into the bolt insertion cylinder and supporting the bush which is divided by vertical partition plates located on both sides and fixed by cutting out the bottom part. Moreover, the bush is characterized in that its spring constant is set to be large in the left-right direction and small in the front-back and up-down directions.

Although Japanese Utility Model Publication No. 45-26884 describes a supporting device for an automobile body, this device does not elastically attach a subframe to the vehicle body side via a bushing, so the present invention is not applicable. The configuration is different.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

To explain the overall outline in FIG. 1, reference numeral 1 is a ladder-shaped chassis frame, and a pipe-shaped subframe 2 is installed parallel to the cross member 1a of this chassis frame 1. A trailing arm type suspension 4 that suspends the rear wheel 3 is constructed using the following.

That is, as shown in FIGS. 2 and 3, the suspension 4 includes bifurcated trailing arms 5 at both left and right ends of the subframe 2, supported by support fittings 6 and 7 attached to the subframe 2, respectively. It is pivoted and can swing up and down with two-point support. A shock absorber 8, a coil spring 9, a helper 10, etc. are attached to the upper part of the trailing arm 5.

In addition, as shown in FIG. 4, the subframe 2 is attached to the vehicle body side by attaching vehicle body mounting brackets 11a and 11b installed perpendicularly to the left and right ends of the subframe 2, respectively, as shown in FIG. This is done by attaching it to the vehicle body at four locations on both ends. Here, brackets 11a and 11b
has a U-shaped cross section and a stepped shape when viewed from the side, and its half on the trailing arm 5 side is set at a high level so as not to interfere with the swing.

At both front and rear ends of the brackets 11a and 11b,
Two support plates 13 and 14 perpendicular to the U-shaped groove 12 are welded at a distance, and a nut 15 attached to one support plate 13 is inserted from the side of the other support plate 14. It is designed to be bolted together with a bolt 16.

Then, within these grooves 12, the support plate 1
A mounting fitting 18 having a bush 17 is inserted into the portion surrounded by 3 and 14.

As shown in FIG. 5, this bushing 17 has a cylindrical body 19 for inserting the bolt 16 located at the center inside the U-shaped bent portion 18a of the mounting bracket 18.
This is molded and fixed to the mounting bracket 18 with elastic rubber 20, and the elastic rubber 20 on both left and right sides of the cylinder 19 is connected to a partition plate 21 passing in the vertical direction,
It is divided by 21. Furthermore, the elastic rubber 20 is hollowed out in the lower part of the cylinder 19.

In this way, by inserting the bolt 16 into the cylindrical body 19 of the bush 17 and screwing it into the nut 15, the mounting bracket 18 is coupled with the bush 17 to the bracket 11a or 11b.
The flange portion 18b is fastened to the member 23 on the vehicle body side with the bolt 22, and the bracket 11
The subframe 2 is suspended together with the subframes a and 11b.

In this assembled state, the bush 1
7, the left and right side walls 18c of the mounting bracket 18, the presence of partition plates 21, 21 parallel thereto, and the elastic rubber 2
The spring constant in the left and right direction is large due to the deformation in the compression and extension directions of 0, and the spring constant in the front and back direction is set small due to the deformation in the shear direction of the elastic rubber 20, and in the vertical direction, the bolt insertion cylinder 19 By cutting out the elastic rubber 20 at the bottom of the elastic rubber 2
Since the shear deformation is 0, the spring constant is set small.

[Effect of idea]

As described above, according to the present invention, the subframe 2 that supports the trailing arm type suspension is fastened to the vehicle body side at four locations at both the front and rear ends of the vehicle body mounting brackets 11a and 11b that are attached perpendicularly to the subframe 2. Since it is attached to the body, sufficient rigidity is maintained. The four mounting points are such that the support plates 14 fixed at intervals in the longitudinal direction are inserted between the support plates 14 at the center of the inside of the U-shaped mounting bracket 18 which is suspended from the vehicle body. A cylindrical body 19 for inserting bolts in the front-rear direction is disposed in the bush 17, which is divided by vertical partition plates 21 located on both sides of the cylindrical body 19, and fixed to the bush 17 by cutting out the lower part. The spring constant of the bush 17 of each mounting part in the left-right direction of the vehicle body is such that one side of the bush 17 in the left-right direction is compressed and the other side is expanded. The repulsion force of the bush due to this compression is large due to the strong force and the presence of the partition plate 21, and therefore the steering stability of the vehicle is good. Since the bushing 17 is easily deformed and is set small, the bushing 17 has good ride comfort and vibration resistance, and since the number of parts of the bushing 17 is small, it can be made simple and compact. Furthermore, since the bush 17 is integrated with the mounting bracket 18, it is easy to assemble on the assembly line.

[Brief explanation of drawings]

Fig. 1 is an overall plan view showing one embodiment of the structure according to the present invention, Fig. 2 is a plan view of the main part, Fig. 3 is a side view of the same, Fig. 4 is a perspective view, and Fig. 5 is a view of the bushing. It is an enlarged sectional view of a part. 1... Palm frame, 2... Sub frame, 4...
Suspension, 5...Trailing arm, 11
a, 11b...Vehicle body mounting bracket, 12...Groove, 1
3, 14...Support plate, 15...Nut, 16...
Bolt, 17...Button, 18...Mounting bracket, 19
...Cylinder for bolt insertion, 20...Elastic rubber, 21...Partition plate.

Claims (1)

[Scope of utility model registration request] In the case where the trailing arm type suspension is configured on a subframe different from the chassis frame, two vehicle body mounting brackets are installed perpendicularly to the subframe, and the four locations on both the front and rear ends of each bracket are attached to the brackets in the longitudinal direction. A cylindrical body for inserting bolts in the longitudinal direction is disposed in the center of a U-shaped mounting bracket which is inserted between support plates fixed at intervals and is suspended from the vehicle body, and It is connected to the mounting bracket by inserting a bolt into the bolt insertion cylinder and supporting the bush which is divided by vertical partition plates located on both sides and fixed by cutting out the bottom part. A suspension subframe mounting device characterized in that the spring constant of the bush is set to be large in the left-right direction and small in the front-rear direction and the up-down direction.