JPS5853219B2 - Leaf spring for vehicle suspension - Google Patents

Description

[Detailed description of the invention] The present invention relates to a leaf spring for vehicle suspension.

In leaf springs for vehicle suspension, in order to equalize the stress distribution and reduce weight, the thickness is reduced in the direction of the leaf ends between the intermediate joints and the leaf ends, which are connected to the vehicle wheels and body, respectively. There is a known device that is provided with a tapered portion.

Since such a tapered part is generally formed by rolling, the width of the plate increases in the direction of the plate end, as in the case of, for example, U.S. Pat. The number of connecting parts becomes diverse, and not only does it take a lot of effort to install and manage parts, but there is also a risk that the wide part may interfere with other parts.

Further, even in the case of Utility Model Publication No. 46-27951 in which the plate end portions are formed thick, the portion of the tapered portion near the plate end is formed wide, which tends to cause interference with other members.

Furthermore, if the plate width is increased over the entire length in order to increase the torsional rigidity of the plate spring, the same problem as mentioned above arises in that the connection structure with the vehicle becomes diverse.

The present invention has been made under the above circumstances, and an object of the present invention is to provide a vehicle suspension that has a tapered portion but can appropriately set torsional rigidity without affecting the connection structure with the vehicle. Our purpose is to provide leaf springs for

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

In FIGS. 1 to 3, a stacked leaf spring device 1 includes a plurality of leaf springs 2 (in the case of three leaf springs in the figure) stacked in the thickness direction.
It is equipped with...

The leaf spring 2 has an intermediate connecting part 3 located at the upper center in the longitudinal direction, a plate end part 4, a tapered part 5 located between these parts 3 and 4, and whose thickness decreases in the direction of the plate ends. 5, and is formed from, for example, spring steel into a substantially band shape.

Intermediate connection 3...... is U bolt 6.6
It is connected to the axle 7 of the vehicle via.

The first leaf spring 2 has eye portions 8, 8 integrally formed on both end portions 4, 4.

One of these eyepiece parts 8, 8 is connected to a vehicle body 11 through a bracket 9, and the other through a shackle 10.

The above general configuration may be the same as that of the conventional device.

The tapered portion 5 of the leaf spring 2 is formed to be wider than the intermediate connecting portion 3 and the plate end portion 4 and to have a substantially constant plate width over the entire length, and the cross section in the direction perpendicular to the longitudinal direction is As shown in FIG. 3, it has a flat, almost rectangular shape.

According to the above configuration, the width bO of the tapered portion 50 is
The taper portion 50 width is wider than the zero width b1 and the plate end portion 40 width b2, and is approximately constant over the entire length.

By setting appropriately, the torsional rigidity of the leaf spring 2 can be set to a desired state regardless of the valley widths b1 and b2 of the intermediate connecting portion 3 and the plate end portions 4.

In other words, since they are tightened with the U bolts 6.6, the width b1 of the intermediate connecting portion 30 and the width b2 of the plate end portion 40 can be kept constant regardless of the magnitude of torsional rigidity.

Therefore, the U bolt 6 for connecting the leaf spring 2 to the vehicle body 11, the position of the U bolt hole in the axle 7, the bracket 8, the shackle 10, and other related parts may also be fixed, and both ends of the tapered part 50 are in the middle. Compared to the case where the width is equal to the valley width of the connecting portion 3 and the plate end portion 4, the size classification of the connecting parts can be significantly reduced, and both parts management and installation work can be simplified.

In addition, since the width is almost constant over the entire length, the maximum width can be set smaller than when the width of the plate is increased partially, which increases the chance of interference with other parts. Nor.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, the number of leaf springs constituting the leaf spring device may be singular.

Moreover, as illustrated in FIG. 4, a parent-child type stacked leaf spring device 1
It can also be applied to the 20 child spring portions 13.

In addition, various modifications and applications are possible within the scope of the gist of the present invention.

As described above, the present invention provides a tapered portion between the intermediate connecting portion and the plate end, the thickness of which gradually decreases toward the plate end, and whose cross section in the direction perpendicular to the longitudinal direction is approximately rectangular. At the same time, the width of the tapered portion is larger than the width of the intermediate connecting portion and the end portion of the plate, and is approximately constant over the entire length, so that the desired torsion can be achieved regardless of the width of the intermediate connecting portion and the end portion of the plate. Can be set to rigidity.

Therefore, the number of different plate widths of the intermediate connecting portion and the plate end portions can be reduced, so that the connecting structure and the connecting work with the vehicle can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a side view showing one embodiment of the present invention, Fig. 2 is a partial top view of the same side, Fig. 3 is a sectional view taken along the ■-■ side of Fig. 1, and Fig. 4 shows a modification. FIG. DESCRIPTION OF SYMBOLS 1... Layered leaf spring device, 2... Leaf spring, 3... Intermediate connection portion, 4... Leaf end portion,
5... Taper part, 7... Axle, 1
1...Car body.

Claims (1)

[Claims] 1. In a leaf spring for vehicle suspension that has an intermediate connection part connected to the wheel side of the vehicle and a plate end part connected to the vehicle body side, there is a part between the intermediate connection part and the plate end part. A tapered part whose thickness gradually decreases toward the end of the board and whose cross section in the direction orthogonal to the longitudinal direction is approximately rectangular is provided, and the width of the tapered part is set to be smaller than the width of each of the intermediate connecting part and the end of the board. A leaf spring for vehicle suspension, characterized in that the leaf spring is wide and substantially constant over its entire length.