JPS5855379B2 - Kuukibanesouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air splash device suitable for use in automobiles, motorcycles, etc., which provides ideal spring characteristics.

Conventionally, when air springs are used as the main springs of automobiles, motorcycles, etc., the air chamber capacity is set with emphasis on the spring characteristics when the load is around 1g, which is frequently used. This is undesirable because it impairs the comfort of the vehicle when it touches the ground when the vehicle is driving on rough terrain.

In order to eliminate this drawback, conventional methods have been used, such as interposing a metal spring that acts in the opposite direction near the extension end, or setting the capacity of the air spring small to increase the spring constant and lowering the initial sealing pressure. Efforts have been made.

On the other hand, air springs use gas, so if they are affected by heat from the outside, the internal pressure changes and the spring characteristics change, which causes changes in vehicle height, and the effect is particularly large near the maximum extension.

Therefore, an object of the present invention is to solve the above-mentioned conventional drawbacks by combining a main air spring and a small auxiliary air spring facing each other, thereby making it possible to rapidly reduce the load especially near the end of extension, thereby creating an ideal reverse S. In addition, by installing this auxiliary air spring on top of the shock absorber's heating element, the main air spring and the auxiliary air spring compensate for each other when heat is applied from the shock absorber. An object of the present invention is to provide an air spring device which minimizes the thermal influence on the air spring as a whole.

An example of implementation of the present invention will be described below with reference to the drawings.

A preferred embodiment of the invention is shown in FIG. 2, that is, an air chamber cylinder 2 is disposed outside the shock absorber 8,
This is fixed to piston rod 1 and piston rod 1
It is designed to move up and down in unison with the

The shock absorber 8 is connected to the wheel side through a lower attachment part 11, and the piston rod 1 is connected to the vehicle body side through an upper attachment part 10.

An intermediate bearing 3 and an intermediate seal 5 are provided at the upper end of the cylinder of the shock absorber 8, and these bearings 3 and intermediate seal 5 guide the vertical movement of the air chamber cylinder 2 by slidingly contacting the inner wall of the air chamber cylinder 2, and the air An upper air chamber A serving as a main spring is defined in the upper blade of the chamber cylinder 2,
Air is sealed into this upper air chamber A through an air filling valve 9.

An outer bearing 4 is fixed to the lower part of the air chamber cylinder 2, and this outer bearing 4 slides on the outer periphery of the shock absorber 8 to guide the vertical movement of the air chamber cylinder 2. A lower air chamber B serving as a sub-spring is defined between the seal 5 and the seal 5.

An air chamber lid 7 is fixed to the lower end of the air chamber cylinder 2, and an external seal 6 is interposed within the air chamber lid 7 to prevent leakage of air in the lower air chamber B.

When the piston rod in the shock absorber 8 is compressed, the upper air chamber A is compressed and the internal pressure increases, and at this time the lower air chamber B expands and the internal pressure decreases.

Conversely, when the piston rod 1 extends, the air chamber cylinder 2 rises, thereby compressing the lower air chamber B and expanding the air chamber A.

In this case, as shown in Figure 1, if we take the spring load on the Y axis and the stroke displacement on the It is shown by curve a.

Similarly, the splash characteristic of the lower air chamber at room temperature is indicated by C, and the splash characteristic at elevated temperature is indicated by d.

Therefore, the overall spring characteristic according to the present invention is based on these curves, c
and add, the overall spring characteristic at normal temperature is shown by curve e, and the overall spring characteristic at elevated temperature is shown by curve f.

That is, in the present invention, by providing a lower air chamber B, which is a sub spring, opposite to an upper air chamber A, which is a main spring, this sub air spring B functions to reduce the load on the main air spring A, and the non-curved curve of both By combining spring, c, and add, it is possible to set nonlinear springs e and f with inverted S-shaped characteristics with a small initial load.

In addition, the conventional air splash has the same characteristics as the main air splash A of the present invention, but when it is affected by heat from the outside, the characteristic a when the temperature rises changes significantly, and the initial load is Although there was a drawback that it varied greatly, by combining the secondary air spring B, both the main air spring and the secondary air spring are affected by heat from the outside, and both are affected by temperature, which improves the overall spring characteristics as a whole. This has little effect on f, and the change in initial load becomes very small.

Furthermore, if the auxiliary air spring B is provided outside the shock absorber 8 as in the present invention, the thermal influence on the auxiliary air spring B is greater than the influence of the main air spring A, and the overall spring characteristics are less likely to change due to temperature changes. You can also expect the benefits of becoming.

Next, another embodiment will be described with reference to FIG. 3 and subsequent figures.

A rolling lobe type sleeve 12 is connected to the lower part of the air chamber cylinder 2, the other end of this sleeve 12 is bent and fixed to the middle body of the shock absorber 8, and the lower air is connected between the sleeve 12 and the air chamber cylinder 2. This is a partition of room B-3.

Also, air is sealed into this air chamber B-3 via a sealing valve q.

The spring characteristics in this case are the same as in the case of FIG.

Also, in the embodiment shown in FIG. 4, the intermediate seal 5 is abolished when compared with the embodiment shown in FIG. It was established.

According to this, even if the air chambers A and B-3 are expanded or compressed, the flow of air is restricted by the orifice 13, and the same effect as described above is produced in the dynamic state of operation.

Further, in this case, since the intermediate seal 5 is eliminated, it becomes possible to reduce the frictional force of the seal portion.

In the embodiment shown in FIG. 5, a metal spring 14 is inserted into the upper air chamber A in the same air splash device as in FIG. 1, and similarly, in the embodiment shown in FIG. An auxiliary metal spring 15 is inserted into B.

According to this, in the embodiment shown in FIG. 5, in order to reduce the internal pressure burden on the intermediate seal 5, the sealing pressure or the pressure rise at the time of maximum compression is kept low, and this shortage can be shared by the load by the metal spring 14.

Further, in the one shown in FIG. 6, the auxiliary metal spring 15 can increase the degree of freedom in setting the characteristics of the overall spring.

As described above, the present invention provides an air chamber cylinder provided outside a shock absorber, connects this air chamber cylinder to a piston rod, moves it up and down together with the piston rod, and holds the air chamber cylinder on the shock absorber. The vertical movement is guided by the intermediate bearing, and the intermediate bearing divides the air chamber into two upper and lower air chambers within the air chamber cylinder. Therefore, as the air cylinder moves vertically, the volumes of the two upper and lower air chambers change, The intermediate bearing does not move, ■The lower air chamber moves to reduce the load on the upper air chamber, and the non-curved springs of the upper and lower air chambers are combined to create an inverted S-shaped overall spring characteristic with a small initial load. ■Since the intermediate bearing is held by a shock absorber, the gas pressure in the upper and lower air chambers can be set independently and freely, and the total spring characteristics can be set relatively freely. ■ Be able to
By combining the upper air chamber with the lower air chamber, the forces of the upper and lower air chambers are affected by heat from the outside, and overall the overall spring characteristics f are less affected by this, and the initial load changes very little. ■ Providing a lower air chamber outside the shock absorber has the effect that the thermal influence on the lower air chamber is greater than the influence of the upper air chamber, and that the overall spring characteristics change less due to temperature changes. It is something.

[Brief explanation of drawings]

FIG. 1 is a longitudinal side view of an air spring according to one embodiment of the present invention, and FIGS. 2, 3, 4, 5, and 6 are longitudinal side views of other embodiments. .

Claims (1)

[Claims] 1. An air chamber cylinder is disposed outside the shock absorber, and this air chamber cylinder is connected to a piston rod so that it can move up and down together with the piston rod.The air chamber cylinder can be moved up and down by an intermediate bearing held in the shock absorber. The air splash device is guided by the intermediate bearing and divides the air chamber cylinder into two upper and lower air chambers, and the synergistic action of these two air chambers provides an inverted S-shaped overall splash characteristic.