JPH04105602U - Accumulator structure - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent gas from permeating from the gas chamber of the accumulator to the working fluid chamber. [Structure] A free piston 3 is slidably fitted on the inner circumference of the piston 2, a gas chamber S1 is defined between the piston 2 and the free piston 3, and a liquid is placed on the free piston 3 side of the gas chamber S1. The chamber S2 defines a hydraulic fluid chamber S3 on the bottom side of the piston 2 of the gas chamber S1. As a result, if part of the gas in the gas chamber S1 passes between the inner circumference of the piston 2 and the outer circumference of the free piston 3, this gas enters the liquid chamber S2 and dissolves in the hydraulic oil in the liquid chamber S2. However, since it takes an extremely long time for the amount of gas dissolved in the hydraulic oil in the liquid chamber S2 to reach a saturated state, the liquid chamber S2 becomes saturated and the gap between the outer periphery of the piston 2 and the inner periphery of the outer case 1 increases. There is substantially no possibility that gas will permeate from the inside and enter the working fluid chamber S3.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is based on a piston-type accu-accumulator with a piston slidably fitted inside the outer case. Regarding the mulrator.

0002

[Conventional technology]

Prevents tire lock by finely controlling brake force during sudden braking. Anti-lock braking system that allows steering operation even while driving Piston type accumulators are used in systems such as ABS systems. This acu As shown in FIG. 02 is slidably fitted, and seals 103, 103 are provided on the outer periphery of the piston 102. and a cap 104 is attached to the opening of the outer case 101. An O-ring 105 is fitted around the outer periphery of this cap 104, and a nitrogen gas chamber S1 is fitted with an O-ring 105. In addition to filling the raw gas and sealing it with the plug bolt 106, the liquid chamber S2 is filled with Some are filled with hydraulic oil.

0003

[Problem that the idea aims to solve]

However, in the conventional accumulator structure mentioned above, the gas chamber side Gas flows through the gap between the inner periphery of the outer case and the outer periphery of the piston and operates beyond the seal 103. Air penetrates into the liquid chamber and enters the system, causing a delay in ABS operation and causing damage. performance may deteriorate.

0004

[Means to solve the problem]

In order to solve the above problems, the present invention has developed a piston shape that is incorporated into the outer case. is a bottomed cylindrical member with an open end, and a free piston is slidably inserted into this piston. into the gas chamber defined between the bottom of the piston and the free piston. A liquid containing pressurized gas and defined between the free piston and the side of the outer case. Liquid is stored in the body chamber and the liquid chamber defined between the bottom of the piston and the side of the outer case. filled with.

[0005]

[Effect]

Suppose that some of the gas in the gas chamber comes from between the inner circumference of the piston and the outer circumference of the free piston. Even if it passes into the liquid chamber defined between the free piston and the side of the outer case, , it takes an extremely long time for this liquid chamber to become saturated, so in practice this The liquid chamber passes through between the inner periphery of the outer case and the outer periphery of the piston and enters the working liquid chamber. It never enters.

[0006]

【Example】

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, Figure 1 shows the present invention. A cross-sectional view of the applied accumulator, Figure 2 shows the assembly procedure of the same accumulator. FIG.

[0007] A bottomed cylindrical piston 2 is slid automatically into the bottomed cylindrical outer case 1 from an opening. A free piston 3 is slidably fitted into the piston 2, and a free piston 3 is slidably fitted into the piston 2. A cap 4 is fixed to the open end of the outer case 1, and the bottom 2a of the piston 2 and A gas chamber S1 is provided between the free piston 3 and the outer case 1. A liquid chamber S2 is formed between the bottom 1a of the piston 2 and the cap 4. A working liquid chamber S3 is defined in each of the chambers, pressurized nitrogen gas is filled in the gas chamber S1, and the liquid is Hydraulic oil is filled into the body chamber S2 from the filling hole 5 of the outer case 1, and after filling, the ball 6 is caulked and sealed, and the hydraulic fluid chamber S3 is filled with hydraulic oil.

[0008] In addition, O-rings are attached to the outer periphery of the piston 2 and the outer periphery of the free piston 3, respectively. 7 and backup rings 8, 8 are fitted, and a free piston is fitted on the inner circumference of the piston 2. A stopper ring 9 is fitted to prevent the stone 3 from falling off, and an anti-rotation ring is fitted to the cap 4. A through hole 10 communicating with the brake brake system is formed.

[0009] To seal pressurized gas in the gas chamber S1 between the piston 2 and the free piston 3. As shown in FIG. 2, the piston 2 is held at the end of the holder 11, and the holder 1 A hole 12 formed in the holder 11 holds the free piston 3 slidably in the holder 1. Push the free piston 3 with the rod 13 while pumping gas from inside the piston 2. and fit the stopper ring 9 to align the piston 2 and free piston 3. After being embodied, it is fitted into the outer case 1.

0010 In an accumulator configured in this way, a pump (not shown) High-pressure hydraulic fluid is pumped into the hydraulic fluid chamber S3, and the hydraulic fluid and gas are balanced at the specified pressure. It is sealed by a solenoid valve (not shown) and requires high-pressure hydraulic fluid. When the system is activated, the solenoid valve is turned on and the hydraulic fluid chamber S Hydraulic fluid is discharged from 3, and then the high-pressure hydraulic fluid necessary for system operation is stored again. be done.

[0011] Here, it is assumed that a part of the gas in the gas chamber S1 is temporarily connected to the inner circumference of the piston 2 and the free piston 3. When the gas passes between the outer periphery and the gas enters the liquid chamber S2, the gas enters the liquid chamber S2. It dissolves in the hydraulic oil, but the amount of gas that dissolves in the hydraulic oil in this liquid chamber S2 is saturated. It takes a very long time, for example, about 10 years, for the liquid chamber S2 to become saturated. gas permeates between the outer periphery of the piston 2 and the inner periphery of the outer case 1. The possibility of entering the dynamic fluid chamber S3 is substantially negligible.

0012

[Effect of the idea]

As explained above, according to the present invention, there is a free space inside the piston inside the outer case. A piston is slidably fitted, and a gas chamber is formed between the piston and the free piston. A liquid chamber containing hydraulic oil and a hydraulic fluid filled with hydraulic oil are placed on both sides of this gas chamber. Since the structure has a chamber, the gas in the gas chamber is distributed between the inner circumference of the piston and the outside of the free piston. Although it permeates into the liquid chamber from between the Since it takes an extremely long period of time, it is practically necessary to move further from this liquid chamber to the inner periphery of the outer case. The hydraulic fluid does not pass between the gas chamber and the outer circumference of the piston and enter the hydraulic chamber. Gas permeation into the chamber can be prevented.

[Brief explanation of drawings]

[Figure 1] Cross-sectional view of an accumulator to which the present invention is applied

[Figure 2] Cross-sectional view showing the assembly procedure of the same accumulator

[Figure 3] Cross-sectional view of a conventional accumulator

[Explanation of symbols]

1... Outer case, 2... Piston, 3... Free piston, 4... Cap, S1... Gas chamber, S2... Liquid chamber, S3
...Hydraulic fluid chamber.

Claims (1)

[Scope of utility model registration request] 1. A piston-type accumulator in which a piston is slidably fitted in an outer case, wherein the piston is a bottomed cylindrical member with one end open, and a free piston is slidably fitted in the piston. A gas chamber containing pressurized gas is defined between the bottom of the piston and the free piston, and a gas chamber containing pressurized gas is defined between the free piston and the side of the outer case and between the bottom of the piston and the side of the outer case. An accumulator structure characterized by defining a liquid chamber between which a liquid is sealed.