JPH0123847Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an accumulator, and more particularly to an accumulator that is suitable for vehicle use and for vehicle height adjustment, in which a relief valve is incorporated in a cartridge type.

Conventionally, when adjusting the vehicle height of a vehicle, an air suspension is interposed between the vehicle body and the wheels, and the air chamber of the air suspension is communicated with or disconnected from the air chamber of the accumulator, so that the air spring in the air chamber is soft or hard. It is being done to

For example, the one shown in FIG. 1 has been developed as this type of accumulator.

This accumulator 1 has a cap 3 connected to the mouth end of a case 2 by welding 4, an air chamber 5 being defined in the case 2, and ports 7, 7 communicating with an air suspension 6 being formed in the cap 3. , these ports 7, 7 are connected to passages 8, 8, 9,
It communicates with the air chamber 5 through the ports 9, 10, and 10, and a valve body 12 of the electromagnetic switching valve 11 is provided between the passages 8, 8 and 9, 9 so as to be openable and closable. 7 and air chamber 5 are relief valves 1
3 and 13 to open and close.

Therefore, when making the air spring of the air chamber of the air suspension 6 hard, the valve body 12 of the switching valve 11
The air chamber 5 may be isolated from the air chamber 5 by closing the mouth end of the passage 8, and if the air spring is to be softened, the valve body 12 opens the mouth end of the passage 8 and the air suspension 6 is closed. Connect the air chamber to port 7-passage 1
This is done by communicating with the air chamber 5 through the 0-passage 8-passage 9 and reducing the spring constant.

On the other hand, when the valve body 12 closes the passage 8 and makes the air spring in the air chamber hard, the pressure in the air chamber may become abnormally high depending on conditions such as the stroke position of the air suspension and the load. There is a possibility that the rolling diaphragm that makes up the air chamber of the unit will be destroyed. Therefore, in order to prevent the diaphragm berth, a relief valve 13 is interposed, and when the pressure in the air chamber exceeds a set pressure, the relief valve 13 opens to relieve the abnormal pressure into the air chamber 5.

However, the relief valve 13 connects the housing 14 to the cap 3 with screws or the like, and the spring 15 at the back of the relief valve 13 is carried by a seat 16 screwed into the housing 14, and the position of this seat 16 cannot be adjusted. Therefore, since the initial of the spring 15 is to be adjusted, the first step is to weld the case 5 and the cap 3 together by welding 4.
After these are combined, the set pressure of the relief valve 13 cannot be adjusted, and maintenance and inspection are also impossible.
If the relief valve 13 is broken, it is necessary to disassemble the accumulator 1 itself;
When joining case 5 to cap 3 by welding,
The effects of this welding heat may change the performance of the rubber relief valve 13 itself and the spring 15, which may change the relief pressure that was set before assembly, which may also lead to damage to the diaphragm. be.

Therefore, the purpose of this invention is to allow the relief setting pressure of the relief valve to be adjusted arbitrarily even after it is assembled to the accumulator body, and to prevent the valve body and spring from being affected by welding heat when the case and cap are welded. An object of the present invention is to provide an accumulator that is suitable for use in a vehicle mounted on a vehicle and for use in adjusting vehicle height.

An embodiment of the present invention will be described below with reference to FIG.

As in FIG. 1, the accumulator 21 has a cap 23 connected to the mouth end of the case 2 by welding 4, and an air chamber 5 is defined within the case 2.

In the radial direction of the cap 23 there are one or more ports 27 and passages 3 leading to the air suspension 6.
0 is formed, and this passage 30 communicates with the air chamber 5 via a chamber 31 and passages 28 and 29 formed in the center of the cap 23 in the axial direction.

The base end of a shaft 32 of the electromagnetic switching valve 11 fits into the chamber 31 via a seal 33, and an arbitrary gap is formed between the end surface of the shaft 32 and the mouth end of each passage 28, 29. ing.

A rod 34 having a T-shaped cross section is slidably inserted into the center of the shaft 32, and a valve body 12 made of rubber or the like facing the passage 28 is coupled to the tip of the rod 34.
With the left and right stroke of the rod 34, the valve body 12
is adapted to open and close the mouth end of the passage 28.

A frame body 35 is fitted on the outside of the shaft 32, and a coil 36 is disposed on the outside of this frame body 35.
6 is held within the housing 37.

The switching valve 11 is fixed to the end surface of the cap 23 with bolts or the like via a support plate 38.

The shaft 32 is divided into two members 32a and 32b, and a spring 39 is installed between each member 32a and 32b.
is interposed.

When a current is supplied to the coil 36, it is energized and the rod 34 moves to the left in the figure.

Next, a relief valve assembly 40 is removably screwed into the cap 23 in the axial direction in a cartridge type manner.

The relief valve assembly 40 consists of a housing 41 and a relief valve 42. The relief valve 42 includes a poppet-shaped valve body 43 made of rubber or the like and a spring 4 that biases the valve body 43 in one direction.
It consists of 4.

The housing 41 is connected to the cap 4 via a screw 45.
5 in the axial direction, and the central thread groove 46
It can be attached and detached using a screwdriver etc. inserted into the holder.

The housing 41 is attached after the cap 23 is connected to the case 2, and is removed from the cap 23 when adjusting the initial value of the relief valve 42, maintenance, or inspection.

The housing 41 has a radial passage 47 and an axial passage 4 which communicates this passage 47 with the air chamber 5.
8 and a chamber 49 are formed, with a radial passage 47 opening into the port 27 of the cap 23 and the passage 30.

A valve body 43 and a spring 44 are arranged in series in the chamber 49, one end of the spring 44 is carried by a seat 50 screwed into the chamber 49, and the valve body 43
is pressed by the spring 44 and its valve head is pushed into the passage 4.
8 is closed.

The spring 44 is initialized by rotating the seat 50 with a tool such as a screwdriver inserted into a threaded groove 51 formed at the outer end of the seat 50.

A seal 5 is provided between the housing 41 and the cap 23.
2 and 53 are interposed to prevent air leakage.

Next, we will discuss the operation.

The valve body 12 of the electromagnetic switching valve 11 moves to the left and enters the passage 28.
When the mouth end of the air chamber 5 is closed, the air chamber 5 and the air chamber of the air suspension 6 are cut off, so the spring constant of the air chamber of the air suspension is high and the air spring becomes hard.

When a predetermined current is supplied to the coil 36, the rod 3
9 moves to the right, and the valve body 12 opens the mouth end of the passage 28.

For this reason, the air chamber of the air suspension 6 is: hose 54 - port 27 - passage 47 - passage 30 - passage 2.
Since the air chamber 5 is connected to the air chamber 5 through the passage 29, the spring constant of the air chamber becomes low and the air spring becomes soft.

Note that the rod 39 can also be used by moving it in the closing direction when the coil 36 is energized.

On the other hand, when the valve body 12 of the switching valve 11 closes the passage 28 and holds the air suspension 6 in a hard state, the internal pressure of the air chamber becomes abnormal depending on conditions such as the stroke position of the air suspension 6 and the load. Even when the pressure rises to
It overcomes the spring 44 of No. 2 and pushes the valve body 43 open against the spring 44. For this reason, the abnormal pressure in the air chamber is released into the air chamber 5 through the passage 48-chamber 49, thereby preventing damage to the diaphragm that partitions the air chamber.

By the way, even if the air in the air chamber escapes into the air chamber 5, if the passage 28 is opened by the valve body 12 to make it soft, the air in the air chamber 5 will be returned to the air chamber, and the compressor etc. The vehicle height can be returned to the original position via the air suspension 6 without supplying air to the air chamber from the air source.

Relief valve assembly 40 is case 2
Since it is attached to the cap 23 after connecting the cap 23 to the case 2 and the cap 23,
Since the valve element 43 and spring 44 of the relief valve 42 are not affected by the welding heat during welding, there is no fear that the initial will change.

Further, when adjusting the initial, maintenance, inspection, or replacement of the relief valve 42 can be carried out freely by taking out the housing 40 outside without disassembling the cap 23 and the case 2.

As described above, in this invention, the relief valve assembly is removably attached to the cartridge after the cap is assembled to the case, so that the spring and valve body that make up the relief valve are protected against the welding heat generated when the cap is welded to the case. Initial adjustment of the relief valve,
This has the effect of allowing maintenance, inspection, and replacement to be carried out freely outside without disassembling the case or cap.

In addition, the air suspension and the air chamber of the accumulator are connected in a closed circuit, and a relief valve is provided in the middle of this circuit so that it can be opened and closed freely, making it possible to release abnormal pressure in the air chamber of the air suspension to the air chamber. Since the air in the air chamber can be returned to the air chamber during soft operation of the pension, there is no need to install an air source such as a compressor.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of a conventional accumulator, and FIG. 2 is a longitudinal sectional front view of an accumulator according to an embodiment of the present invention. 2... Case, 5... Air chamber, 6... Air suspension, 11... Switching valve, 23... Cap, 27, 28, 29, 30... Passage, 40...
... relief valve assembly, 42 ... relief valve, 47 ... radial passage, 48 ... longitudinal passage, 49 ... chamber.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A cap is connected to a case that partitions an air chamber, and a passage is provided in the cap to connect the air chamber to the air chamber of the air suspension, and this passage is provided with a switching valve. In the accumulator which is opened and closed arbitrarily through the cap, a relief valve assembly is detachably attached to the cap, and the relief valve assembly includes a passage means for communicating the passage to the air chamber, and a passage means for communicating the passage with the air chamber. An accumulator consisting of a relief valve that can be opened and closed freely. (2) The accumulator according to claim 1, wherein the passage means comprises a radial passage, a longitudinal passage, and a chamber incorporating a relief valve.