JPH0535252Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a device that is connected between a pair of air springs installed on a railway vehicle, etc., so that the pressure of the pair of air springs is within a certain pressure difference. This invention relates to a differential pressure valve for air springs that adjusts to

[Conventional technology]

Conventionally, as this type of air spring differential pressure valve, the third
There is one shown in the figure. In Fig. 3, a pair of left and right air springs 1 and 1' are connected to an air spring automatic height adjustment valve 2,
Air is supplied via 2'. A valve body 4 of the air spring differential pressure valve is provided between the communication pipes 3 and 3' of the pair of left and right air springs 1 and 1'. The valve body 4 includes a pair of supply/discharge ports 5, which are connected to the communication pipes 3, 3' of the left and right air springs 1, 1', respectively.
5' is provided. In addition, this supply/discharge port 5,
A pair of ventilation holes 6, 6' are also provided which connect the vents 5' in parallel. Based on the air pressure difference between the air springs 1 and 1', one of the ventilation holes 6,
Check valves 7 and 7' for opening and closing the valve 6' are built in and facing each other. This check valve 7 is connected to the valve seat 8 via the valve seat 8, the valve 9, the spring receiver 10, and the spring receiver 10.
It consists of a spring member 11 that biases the.

The air spring differential pressure valve having the above-described structure operates as follows. In a normal state where the difference between the internal pressures of the left and right air springs 1, 1' is below a specified value, the check valves 7, 7' are seated, as shown in FIG. what if,
If the internal pressure of the right air spring 1' drops due to damage, etc., the difference between the internal pressure of the left air spring 1 and the internal pressure becomes more than a specified value, and the check valve 7 resists the biasing force of the spring member 11 due to this differential pressure. It opens to the pores 6. Air from the left air spring 1 flows into the right air spring 1' through the ventilation hole 6 and the air supply/discharge port 5', thereby preventing abnormal tilting of the vehicle body and ensuring safe driving. Furthermore, when the difference between the internal pressures of the left and right air springs 1 and 1' returns to the specified value, the check valve 7 is seated (closed).
Return to the state shown in Figure 3. Further, when the internal pressure of the left air spring 1 drops, the check valve 7' opens to the vent hole 6' and performs the same operation.

[The problem that the idea aims to solve]

In the air spring differential pressure valve described above, when the internal pressure of the right air spring 1' drops, the check valve 7 opens to the vent hole 6. At this time, the pressure air in part a rapidly flows to parts b and c, so the pressure in part a decreases a little. Then, the check valve 7 is closed by the biasing force of the spring member 11. However, since pressurized air is immediately supplied from the air spring 1, the check valve 7 opens again. By repeating these operations, the check valve 7
Because the valve vibrates (repeatedly opening and closing), the valve 9,
There were problems in that the deterioration of the valve seat 8 and the spring member 11 was accelerated, and the sound of the valve 9 hitting the valve seat 8 and the pulsating sound of air were generated. In particular, this pulsating noise resonates with the pipes, air springs, etc., causing them to rumble (produce a loud buzzing sound), which causes discomfort to passengers, for example.

The present invention solves the above problems.

[Means to solve the problem]

The valve body is provided with a pair of supply and discharge ports connected to each of the pair of air springs, and a pair of ventilation holes that connect these supply and discharge ports in parallel are provided, and the air springs are biased by a spring member. In a differential pressure valve for an air spring, the valve body is mounted on a spring receiving part that receives the resistance of the spring member of the check valve. An elastic member is attached that slides on the inner wall, and this elastic member provides resistance to the opening/closing operation of the check valve.

[Effect]

In FIG. 1, an elastic member 14 provided in a spring receiving portion 10 that receives the resistance force of a spring member 11 of the check valve 7 and slidingly contacts the inner wall of the valve body 4 provides resistance to the opening/closing operation of the check valve 7. Therefore, even if the pressure air in part a rapidly flows to parts b and c and the pressure in part a drops a little, the check valve 7 will not close as expected. Also, a
The check valve 7 remains open because the air is immediately replenished by the air spring 1. Then, as the differential pressure value between the left and right air springs 1 and 1' approaches a specified value, the check valve 7 gradually closes.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a differential pressure valve for an air spring;
Similar to FIG. 3 described above, the check valve is shown in a seated state.

FIG. 2 is an enlarged sectional view of the spring receiver.

In FIGS. 1 and 2, parts having the same functions as those in FIG. 3 are designated by the same reference numerals, and their explanations will be omitted.

The difference from FIG. 3 is the configuration of the spring receiver 10 and its related parts.

1 and 2, the spring receiving part 10 consists of a large diameter part 10a and a small diameter part 10b.
0a is housed in a sleeve 12 that forms the inner wall of the valve body 4. A packing 14 as an elastic member is fitted into a groove 13 formed on the outer periphery of the large diameter portion 10a. This patchkin 14
The sliding of the inner surface of the sleeve 12 provides resistance to the opening/closing operation of the check valve 7. Note that the vertical hole 15 of the small diameter portion 10b and the center hole 1 of the large diameter portion 10a
Reference numeral 6 allows the space in which the spring member 11 is accommodated to communicate with the ventilation hole 6 . That is, sleeve 1
Since the gasket 14 is provided between the spring member 2 and the spring receiver 10, the space accommodating the spring member 11 becomes a pressure chamber so that the movement of the spring receiver 10 is not restricted.

The packing 14 as an elastic member may be one that provides minimum resistance without causing vibration when the check valve 7 is operated. Therefore, low-sliding gaskets, e.g.
MY type etc. are preferable. In addition, the spring receiving part 10
The corner part 10c is rounded, and the large diameter part 10
The entire surface a is made close to a spherical surface, and the sliding resistance between the inner surface of the sleeve 12 and the outer periphery of the spring receiving portion 10 is minimized.
As a result, even if the movement of the check valve 7 is slowed down,
Valve performance such as response, hysteresis, and capacity is almost the same as conventional products (with only a slight decrease). In addition, in order to reduce the sliding resistance of the spring receiving part 10 without applying R processing to the corner portion 10c, the total length of this spring receiving part 10 must be increased, but by performing R processing, The total length of this spring receiving part 10 can be shortened,
The total length of the check valve 7 is made as short as possible.

The valve body 4 of this embodiment and the conventional example has a structure in which the check valve cover 4a is removable and maintenance of the check valve 7 is easy. Therefore, in the conventional air spring differential pressure valve, only the check valve cover 4a and the spring receiving part 10 need be replaced, and the other parts can be used as they are. In other words, conventional products can be easily modified. However, the structure of the valve body 4 using the check valve lid 4a is not essential, and the present invention is also applicable to other check valve 7 mounting structures. For example, in FIG. 1, a check valve 7 is provided at the position of the supply/discharge port 5', a check valve 7' is provided at the position of the supply/discharge port 5, and the vertical hole 15, center hole 16, and A structure in which air flows through the spring member 11 may be used.

[Effect of idea]

An elastic member that slides against the inner wall of the valve body is attached to the spring receiving portion that receives the drag force of the spring member of the check valve, and this elastic member provides resistance to the opening and closing operations of the check valve. The valve 9, valve seat 8, and spring member 1 do not vibrate (repeated opening and closing).
1 from deterioration and from ringing (making a loud buzzing sound), for example, it is possible to eliminate discomfort for passengers.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a differential pressure valve for an air spring according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a spring receiving portion, and FIG. 3 is a sectional view of a conventional differential pressure valve for an air spring. 1, 1'...Air spring, 4...Valve body, 5,
5'... Supply/exhaust port, 6, 6'... Ventilation hole, 7, 7'...
... Check valve, 10 ... Spring receiving part, 11 ... Spring member, 14 ... Packing (elastic member).

Claims (1)

[Claims for Utility Model Registration] A pair of supply and discharge ports connected to each of a pair of air springs is provided in the valve body, a pair of ventilation holes are provided in parallel and communicate with these supply and discharge ports, and the spring member In the differential pressure valve for air springs, the air spring differential pressure valve includes opposing check valves that open and close one of the vent holes based on the air pressure difference between the air springs based on the air pressure difference between the air springs. A differential pressure valve for an air spring, characterized in that an elastic member that slides on the inner wall of the valve body is attached to a spring receiving portion that receives the spring, and the elastic member provides resistance to the opening/closing operation of the check valve.