JPH0529387Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention is a two-stage load coil spring, specifically, one coil spring is equipped with a spring part with a low repulsion load and a spring part with a high repulsion load. This relates to a two-stage load coil spring.

(Prior Art) Conventionally, this type of coil spring has been developed, for example, by increasing the winding width (pitch) P of a part of a coil spring with the same coil diameter D, as shown in FIG. Alternatively, as shown in Fig. 6, a spring part with a large repulsion load may be formed separately from the spring part with a low repulsion load, or the coil diameter d may be made small in a part of the coil spring to create a repulsion load separately from the spring part with a low repulsion load. A large spring portion is formed.

(Means for solving the problem) However, when applying a high repulsion load to these coil springs, in the case of the former coil spring,
There is a limit because it is said that it cannot be used unless the pitch P is less than the coil diameter D, and in the case of the latter coil spring, it cannot be used if the coil inner diameter d is smaller than the wire diameter. Therefore, in conventional coil springs, due to the limit of the pitch P or the limit of the coil inner diameter d, etc.
While maintaining low repulsion load that absorbs weak loads,
There was a problem in that it was not possible to apply a high repulsion load that would absorb an extremely large load.

An object of the present invention is to make it possible to reliably absorb a large load that cannot be absorbed by the conventional two-stage loaded coil spring.

(Problems to be Solved by the Invention) Therefore, the present invention has a coil-shaped first spring portion 1 having a low repulsion load, which is made by winding a wire with a predetermined coil diameter and a predetermined pitch, and The wire rod is continuously wound around the spring part 1 with the same diameter as the spring part 1, and the peak part 21 and the valley part 22 are formed by bending in a wave shape in the axial direction of the spring part 1. and a corrugated second spring part 2 in which axially adjacent peaks 21 and troughs 22 are in contact with each other in the axial direction and have a high repulsion load larger than the low repulsion load of the first spring part 1. It is equipped with the following.

(Function) With the above configuration, a weak load can be absorbed by compression of the coiled first spring portion 1, while an extremely large load can be absorbed by fully compressing the first spring 1 and then absorbing the waveform. This can be reliably absorbed by the deflection of each peak 21 and trough 22 in the other second spring section 2, and the wave-shaped second spring section 2 can absorb the axially adjacent peaks 21.
Since the troughs 22 are in contact with each other in the axial direction in advance, when the first spring 1 is fully compressed, the second spring 2 does not expand in diameter or move in the axial direction. As a result, the peak portions 21 and the valley portions 22 of the second spring portion 2 that are adjacent to each other in the axial direction can be kept in accurate contact without being misaligned, and as a result, By selecting the number of peaks 21 and troughs 22 provided between the circumferences of the coils of the second spring portion 2, a predetermined high repulsion load can be accurately obtained.

Furthermore, since the wave-shaped second spring 2 is provided continuously to the first spring portion 1, the operating stroke when receiving a low repulsion load and the operating stroke when receiving a low repulsion load can be arbitrarily set. It is.

(Example) Figs. 1 to 4 show a two-stage loaded coil spring according to the present invention, and the coil spring is made of a single wire rod with a predetermined coil diameter and a predetermined pitch, as shown in Fig. 1. The wire is wound to form a coil spring part 1 having a low repulsion load, and the wire is connected to one end of the first spring part 1 so as to be continuous with the first spring part 1.
The crests 21 and troughs 22 are wound with the same diameter and are bent in a wave shape in the axial direction of the spring portion 1, and the ridges 2 are adjacent to each other in the axial direction.
1 and the valley portion 22 are in contact with each other in the axial direction, forming a wave-shaped second spring portion 2 having a high repulsion load larger than the low repulsion load of the first spring portion 1.

In the embodiment shown in the figure, the corrugated second spring portion 2
The cross-sectional shape of is formed into a rectangular shape as shown in FIG.
The cross-sectional shape of the coiled first spring part 1 excluding the second spring part 2 is formed into a circular shape, and two sets of peaks 21 and valleys 22 are provided between each circumference of the coil of the second spring part 2. At the same time, the peak portion 21 of one side coil of the axially adjacent coils overlaps the trough portion 22 of the other side coil.
The troughs 22 of the one side coil, which are separated from each other and adjacent to each other in the circumferential direction, abut against the peaks 21 of the other side coil. In this way, the second spring part 2
The weak load is absorbed by the compression of the first spring part 1 excluding I wanted to absorb it.

The present invention is constructed as described above, and the present invention 2
When a stepped-load coil spring is used, for example, as a shock absorbing material for an automobile, the compression of the coiled first spring section 1 excluding the wave-shaped second spring section 2 is effective against weak shock loads during normal driving. It absorbs the air so as not to impair ride comfort.

In addition, in the case where a sudden strong impact load is applied, such as by running onto a sidewalk, after the first spring part 1 except the second spring part 2 is fully compressed, each peak and trough in the second spring part 2 is compressed. The parts 21 and 22 are deflected, and their deflection forces absorb an extremely large impact load.

In this case, as shown in FIG. 4, the pair of peaks and valleys 21 and 22 in the wave-shaped second spring section 2 can have a high repulsion load necessary to bend the two wires. As shown in FIG. 1, there are peaks, troughs 21,
When two sets of 22 are installed, the bending force of four wires,
In other words, it is possible to provide a high repulsion load, which allows the wave spring portion 2 to absorb an extremely large load.

Therefore, unlike conventional two-stage load coil springs, the entire coil spring is completely compressed and a large impact called bottoming out occurs, which can damage the vehicle body or cause the steering wheel to be taken off. It can be prevented.

In the above embodiment, the peaks and troughs 21 and 22 are divided into two parts between the circumferences of the coils of the second spring part 2.
Although the number of peaks and troughs 21 and 22 is provided as a set, the number of these peaks and valleys 21 and 22 is not limited in any way. For example, if three sets of peaks and valleys 21 and 22 are provided, it is possible to have the bending force of six lines. It becomes.

Further, in the above embodiment, the cross section of the second spring part 2 is formed into a rectangular shape so that the peak part 21 and the valley part 22 can surely come into contact with each other. The cross-sectional shape and the cross-sectional shape of the coil spring portion 1 are also not particularly limited.

(Effects of the invention) As described above, the present invention has a coil-shaped first spring part 1 having a low repulsion load made by winding a wire with a predetermined coil diameter at a predetermined pitch, and a continuous This is because the wire rod is wound with the same diameter as the spring part 1, and has peaks 21 and troughs 22 formed by bending in a wave shape in the axial direction of the spring part 1. A weak load can be absorbed by compression of the coiled first spring part 1, but an extremely large load can be absorbed by compressing the first spring part 1 and then absorbing it by compressing the first coiled spring part 2. This can be reliably absorbed by the deflection of each peak 21 and trough 22, and furthermore, in the waveform second spring section 2, the axially adjacent peaks 21 and troughs 22 are axially adjacent to each other. Since they are in contact with each other in advance, when the first spring 1 is fully compressed, the second spring 2 does not expand in diameter or move in the axial direction. The peak portions 21 and the valley portions 22 which are adjacent to each other in the axial direction of the second spring portion 2 and are in contact with each other can be kept in accurate contact without being misaligned, and as a result, the coil of the second spring portion 2 A predetermined high repulsion load can be accurately set by the number of peaks 21 and troughs 22 provided in one circumference.

Furthermore, since the wave-shaped second spring 2 is provided separately in the axial direction in succession to the first spring portion 1, the operating stroke of the first spring 1 and the operation of the second spring 2, which are subjected to a low repulsion load, are While the stroke can be set arbitrarily, the overall axial length can be made small. Therefore, for example, even when used as a shock absorbing material for an automobile, the low repulsion load until the first spring 1 is fully compressed can be reduced. Since the operating stroke when receiving a high repulsion load can be set to a constant length, and the operating stroke when receiving a high repulsion load can be set to the required minimum stroke, it can be installed without increasing the height of the vehicle. Moreover, apart from the first spring part 1, a second spring part 2 is provided.
Therefore, while having the first spring part 1 and the second spring part 2 as described above, the overall processing can be simplified and the cost can be reduced.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the two-stage load devised spring of the present invention, Fig. 2 is a sectional view of the wave spring portion, and Fig. 3 is a sectional view of the wave spring portion.
The figure is a cross-sectional view of the coil spring part, FIG. 4 is an explanatory diagram showing the deflection state of the wave spring part, and FIGS. 5 and 6 are explanatory diagrams each showing a conventional example. 1...First spring part, 2...Second spring part.

Claims (1)

[Scope of utility model registration request] A coil-shaped first spring portion 1 having a low repulsion load and made by winding a wire rod with a predetermined coil diameter and a predetermined pitch.
and a mountain part 2 formed by winding the wire rod continuously around the first spring part 1 with the same diameter as the spring part 1 and bending it in a wave shape in the axial direction of the spring part 1.
1 and troughs 22, the axially adjacent peaks 21 and troughs 22 are in contact with each other in the axial direction, and the waveform has a high repulsion load larger than the low repulsion load of the first spring section 1. A two-stage load coil spring characterized by comprising a second spring portion 2.