JPS612932A - Hollow leaf spring device - Google Patents

Abstract

PURPOSE:To enable the adjustment or the like of the height of a vehicle, by pouring an incompressible fluid into the hollow portion of a leaf spring, and applying pressure to the fluid to alter the cross-sectional form of the leaf spring. CONSTITUTION:The hollow leaf spring 2 of a hollow leaf spring device 1 includes hollow portions 2a communicating with each other and enclosed along almost the total length of the leaf spring. An incompressible fluid feeder 10 is connected to the hollow portions 2a through a flexible hose 9 connected to an inlet port 2e. An incompressible fluid is poured into the hollow portions 2a and pressurized by the feeder 10 so as to alter the cross-sectional form of the leaf spring 2 to enable the adjustment or the like of the height of a vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a hollow leaf spring device, and particularly relates to a hollow leaf spring device in which an incompressible fluid is injected into the hollow portion of a leaf spring to pressurize it and change the cross-sectional shape of the leaf spring to increase vehicle height. This invention relates to a hollow leaf spring device that can be adjusted.

Conventional leaf springs for vehicles generally flex due to variations in live load and unevenness of the road surface, resulting in changes in vehicle height. When a change in vehicle height occurs in this way, for example, in the case of a route bus or truck, if the vehicle height when empty - that is, the minimum ground clearance - is lowered, it will be 1
When the vehicle is loaded, the minimum ground clearance tends to touch the road surface, so the minimum ground clearance when the vehicle is empty must be set high.

However, if the minimum ground clearance is increased when the vehicle is empty, the ease of getting on and off the vehicle will deteriorate in the case of N-buses, etc., and in the case of trucks, it will not only deteriorate the ease of cargo handling but also the stability at high speeds will deteriorate. There is a point. The use of air springs, which can maintain a constant vehicle height regardless of the loaded state of the vehicle, has been discouraged, but since air springs inherently have low lateral rigidity, reinforcement of lateral rods, radius rods, torque ronds, etc. As more parts are required, the weight and cost increase, making it difficult to use for route buses and trucks.

None of the conventional leaf springs has a cross-sectional shape that can be changed as needed, and it has been impossible to change the vehicle height by deforming the leaf spring itself.

Purpose The present invention has been made in order to eliminate the drawbacks of the prior art described in -1-, and its purpose is to form a hollow part in a leaf spring over almost the entire length of the leaf spring. An incompressible fluid is transferred to n-persons 1. It is possible to change the cross-sectional shape of the leaf spring by changing the cross-sectional shape of the leaf spring, and it is also possible to increase or decrease the spring constant by changing the thickness of the leaf spring by using the ribs. The object of the present invention is to make it possible to change the minimum ground clearance of an L-route bus or a L-rack when the vehicle is empty so that it can be changed by deforming the spring itself so that running when the vehicle is loaded will not be hindered. 1) Another purpose is to obtain a leaf spring device that has the same vehicle height adjustment function as an air spring without having to use an expensive air spring, and 1) to reduce cost and weight. It is.

Overview In short, the present invention includes forming a hollow portion in the leaf spring that is connected and sealed over substantially the entire length of the leaf spring, and providing an injection port 1 communicating with the outside in the hollow portion. An incompressible fluid supply device is connected through the hose, and the incompressible fluid is injected and pressurized into the hollow portion by the supply device, thereby changing the cross-sectional shape of the leaf spring. It is characterized by:

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on embodiments shown in the drawings. The hollow leaf spring 2 of the hollow leaf spring device 1 according to the present invention is formed with a hollow portion 2a that communicates with and is sealed over substantially the entire length of the leaf spring. [l There is a communication hole 2C in the central part 2b that is tightened to the axle 6 via the pads 4 and 5 with the bolt 3.
is provided at the end 2d that moves the least while the vehicle 8 is running, and an injection port that communicates with the hollow part 2a and the outside.
12e is provided.

As shown in FIG. 5, an incompressible fluid supply device 10 is connected to the inlet via an N flexible hose 9, and the incompressible fluid f1 is supplied to the hollow portion 2a by the supply device. For example, the cross-sectional shape of the one-plate spring 2 is changed by injecting oil and applying pressure.

In the embodiment shown in FIG. 5, the incompressible fluid supply device 10 includes a surge tank 1 to which a flexible hose 9 is connected, and a leveling valve 12 connected to the surge tank. Lever 1 that operates the pelling valve 12
3, and a link 14 connected to the lever and the axle 6.
It detects the phase 7.1 positional relationship between the spring 2 and the vehicle body 15 of the vehicle 8, and automatically adjusts the amount of fluid stagnation of non-111 m++ according to the vehicle height 11. It is designed to be adjusted to Note that the surge tank 11 can also be omitted.

1. In the embodiment shown in FIG. 2, a manual operation device 16 is provided outside the vehicle 8, and an incompressible fluid is injected into the leaf spring 2 by manual operation according to the loaded weight of the vehicle 8. ing.

In the embodiment shown in FIG. 7, one hollow leaf spring 2 ( ).

21 are stacked to form a stacked leaf spring 22, and the central portions 20b, 21b are provided with communication holes 20c, 21c for communicating the hollow portions 20a, 21a of both the leaf springs 20, 21.
+1 communication holes 2Of and 21f are provided to communicate with the n-in. Although not shown, a sealing member is provided around the bottom communication hole to prevent oil leakage. The rest of the structure is the same as that of the embodiment shown in FIG. 5, so the same parts of the rod are given the same reference numerals in the drawings and their explanation will be omitted.

Function The present invention is constructed as described above, and its function will be explained below. In the embodiment shown in FIG.
When the load M on the center axle 8 is large and the Φ height l] is low, the driver steps outside the axle and operates the manual operation device 16. Then, for example, oil flows into the hollow part 2a of the hollow leaf spring 2 from the injected part 2e, and the hollow part 2a is pressurized, and as shown in FIG. After a thin plate is injected with oil and pressurized, it expands toward the A side as shown by the imaginary line, and the plate thickness increases.7 - The second moment of area is proportional to the cube of the plate thickness. As the bending stiffness, that is, the spring constant of the hollow leaf spring 2 increases, the amount of deflection decreases, so that the Φ height 11 increases and reaches a desired value. If the medium height H is too high, operating the manual operating device 16 in the opposite direction to the above will cause oil to escape from the hollow part 2a of the hollow plate spring 2, reducing the plate thickness - and reducing the spring constant. High 11 goes down.

The embodiment shown in FIG. 5 is suitable for a vehicle such as a one-route bus in which the onboard surface 1 of the vehicle is constantly changing, and the height of the vehicle can be maintained constant at all times. That is, when the vehicle height is lowered, the axles 6 and 7 and the frame 15 approach each other, the link 14 is placed on top, and the lever 13 is rotated in the counterclockwise direction H1 in the figure. Oil is supplied, and the oil is completely injected into the hollow part 2a of the hollow leaf spring 2 through the flexible hose 9 (a) from the surge tank and is pressurized.

Then, as shown by the solid line on the left side of Fig. 6, the hollow leaf spring 2 of the force plate I expands as shown by the imaginary line on the right side, and the plate thickness increases, the spring constant increases, and the deflection decreases. The height goes up.

Furthermore, when the total weight of the vehicle decreases, the axle 6 is lowered, so the link 14, lever 13, and leveling valve 12 act in the opposite manner to the above to remove oil from the hollow portion 2a. As the spring constant decreases, the vehicle height decreases by -F.

This h action is repeated to keep the middle height 11 of the 11 cars constant.

The operation of the embodiment shown in FIG. 7 is similar to that described above, except that oil enters and exits the hollow portion 2]a of the middle η square spring 21 through the communication holes 2Of and 21f. As shown in Figure 8, the thickness of the hollow leaf springs 20 and 2+ changes before oil is pressurized (on the left) and after it is injected and pressurized (on the right).
The spring constant also changes, so that the vehicle height is always maintained at a constant VC, similar to the embodiment shown in FIG.

Although no particular mention was made of the material of the hollow leaf springs 2, 20, 21 in each of the above embodiments, the springs may be made of steel or 1k PRP, both of which are practical. Explanation is that the fluid is oil and 7
However, it is not specifically limited to oil.

Effect Since the present invention is constructed and operates as described above, a hollow portion extending substantially over the entire length of a leaf spring is formed, and an incompressible fluid is injected into the hollow portion to reduce the cross section of the leaf spring. It has the effect of being able to change its shape - as a result, by changing the thickness of the leaf spring, it is possible to increase or decrease the spring constant at will, and the height of the vehicle can be changed by deforming the leaf spring itself. The effect can be obtained that even if the lowest ground height of a route bus or a truck when the vehicle is empty is made low, there is no problem in running when the vehicle is loaded.

In addition, it is possible to obtain a reciprocal spring device that has the same vehicle height adjustment function as an air spring without using an expensive air spring.As a result, it is possible to reduce cost and weight. .

[Brief explanation of drawings]

The drawings relate to embodiments of the present invention;
+ fluid (a side view of a vehicle equipped with a hollow plate mount [6] for the Jt feeder, Fig. 3 is a vertical sectional view taken along the In-III arrow in Fig. 1, Fig. 4 is a longitudinal sectional view of Fig. 1). IV-IV longitudinal cross-sectional view (diagram showing changes in cross-sectional shape), Figure 5. A side view, FIG. 6 is a longitudinal sectional view similar to FIG. 4,
71'XI is a side view of a hollow leaf spring device using a stack of hollow leaf springs, and FIG. 8 is a longitudinal sectional view similar to FIG. 4. 1 is a hollow leaf spring device, 2, 20, 21 are hollow leaf spring rods 2a, 20a, 21a are hollow parts, 2e, 2
0e ke 71 people 11.8 is j'li ＼91-1 flexible f[
The port 110 is the fluid supply bag fFi~12 of the uncompressible f[
The chassis frame of the leveling pulp 15C1 is an example, and 16 is a manual operating device.

Claims (1)

[Scope of Claims] 1. A sealed hollow part is formed in the leaf spring and communicates with it over substantially the entire length of the leaf spring, an injection port communicating with the outside is provided in the hollow part, and a flexible An incompressible fluid supply device is connected via a hose, and the incompressible fluid is injected and pressurized into the hollow portion by the supply device, thereby changing the cross-sectional shape of the leaf spring. Features a hollow leaf spring device. 2. The hollow leaf spring device according to claim 1, wherein the incompressible fluid is oil. 3. The incompressible fluid supply device includes a manual operation device, and is configured to inject the incompressible fluid into the leaf spring by manual operation according to the loaded weight of the vehicle. A hollow leaf spring device according to claim 1. 4. The incompressible fluid supply device includes a leveling valve that detects the relative positional relationship between the leaf spring and the vehicle body and automatically adjusts the injection amount of the incompressible fluid according to the vehicle height. A hollow leaf spring device characterized in that it is a hollow leaf spring device.