JPH1089302A - Gas filling part sealing structure for accumulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a gas filling part sealing structure for an accumulator which has a simple structure and satisfactory operability by providing a tubular gas filling part, and press-fitting a ball to the gas filling part for sealing a gas filling chamber. SOLUTION: A gas filling part sealing structure 2 of an accumulator 1 has a gas filling part 6 and a blocking ball 15 press-fitted to the gas filling part 6. The gas sealing part 6 has a tubular form integrated with an accumulator housing 3, while the ball 15 is press-fitted from its opening 6A in the direction of a gas filling chamber 8. The ball 15 is held in the part 6 by means o a spring back of the part 6. Outer side portions of the pipe of the gas sealing part 6 are narrowed. Gaseous pressure from the chamber 8 is closed by the gall 15 for improving sealability of the gas. Escape of the ball 15 is prevented. The part 6 cannot be treated from the outside, so that unexpected breakage is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-sealed portion of an accumulator, and more particularly, to a gas-sealed portion of an accumulator of a gas-sealed type which can improve the workability at the time of gas-sealing. It relates to a closed structure.

[0002]

2. Description of the Related Art Conventionally, dampers or accumulators have been used to absorb pressure pulsations generated when fuel or other fluid is supplied or to accumulate pressure. For example, JP-A-51-93419
JP-A-60-94860, JP-A-4-83903
Issue.

[0003] In such accumulators and the like, a gas-filled chamber is defined therein by a partition-forming elastic member such as a diaphragm or bellows.
In sealing the gas sealing section connected to the gas sealing chamber, the gas sealing chamber is sealed by interposing an O-ring or a gasket and tightening a bolt or the like.

However, in the above-mentioned gas-sealed portion closed structure, the bolt can be loosened from the outside, the gas does not function as an accumulator when gas is released by loosening the bolt, and the O-ring is used as a seal member. After a long period of time, gas permeates to the outside, the bolt must be turned when filling gas, the workability is poor, and the structure is small because bolts and O-rings are arranged for gas filling. There are various problems such as difficulty in conversion.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a gas-filled accumulator which can solve the above-mentioned problems in a gas-filled accumulator has a gas-filled portion sealed structure. The task is to provide.

Another object of the present invention is to provide a gas-sealed portion closed structure of an accumulator having a simple structure and good workability.

Another object of the present invention is to provide a gas-sealed portion sealing structure of an accumulator which can maintain good gas-tightness.

[0008]

That is, the present invention focuses on making the gas filling portion a pipe shape and press-fitting a ball into the gas filling portion. The accumulator housing and the accumulator housing have the same structure. A gas sealed portion communicating with the partitioned gas sealed chamber, and a gas sealed portion sealed structure of an accumulator having:
A gas-sealed portion sealed structure of an accumulator, wherein the gas-sealed portion has a pipe shape, and a ball is pressed into the gas-sealed portion to seal the gas-sealed chamber.

It is desirable that the accumulator housing and the gas filling portion be formed integrally with each other and be formed of a stainless steel material.

[0010] In the closed structure of the gas filling portion of the accumulator according to the present invention, the gas filling portion has a pipe shape,
Since the ball is press-fitted into the gas-filled portion, it is possible to hold the ball with a predetermined tightening strength by a spring-back action based on the elastic force of the gas-filled portion. Therefore, a desired airtightness can be ensured, and it is impossible to remove the ball from the outside, so that careless degassing does not occur.

Moreover, since the ball is merely press-fitted into the gas filling portion from the outside, the gas filling operation can be performed by a simple operation, the workability is good, and the shape of the gas filling portion is reduced. The weight can be reduced, and the cost can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a sealed structure of a gas filling portion of an accumulator according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an accumulator 1,
FIG. 2 is a cross-sectional view of a gas-sealed portion sealing structure 2 provided in the accumulator 1, wherein the accumulator 1 has an accumulator housing 3, a diaphragm 4, and a gas-sealed portion sealed structure 2.

A fuel pressure introducing section 5 and a gas filling section 6 are formed in the accumulator housing 3, and a fuel pressure chamber 7 is provided on the fuel pressure introducing section 5 side with the diaphragm 4 interposed therebetween.
Gas sealing chambers 8 are formed on the gas sealing portion 6 side, respectively. The inner wall of the accumulator housing 3 on the side of the gas filling chamber 8 is formed with an arc-shaped diaphragm stopper wall surface 9 for restricting the maximum deformation of the diaphragm 4.

The fuel pressure introducing section 5 receives high-pressure fuel from a fuel pump 10 (high-pressure pump) via a high-pressure fuel supply pipe 11. The accumulator 1 and the fuel pump 1
The number 0 can be either integrally formed or connected as separate components.

Further, the fuel pump 10 and the accumulator 1 are connected to a common rail 13 via a fuel supply high-pressure branch pipe 12 branched from the fuel supply high-pressure pipe 11, and fuel (for example, gasoline) is supplied from a fuel injection valve 14, for example. Inject directly into the engine cylinder.

The gas-sealed portion sealing structure 2 of the accumulator 1 has a gas-sealed portion 6 and a sealing ball 15 pressed into the gas-sealed portion 6.

The gas filling portion 6 is formed in a pipe shape integral with the accumulator housing 3 and has an opening 6A.
, The ball 15 is pressed into the gas filling chamber 8.

FIG. 2 is an enlarged cross-sectional view of the gas sealing portion 6 (gas sealing portion closed structure 2). The spring 15 of the gas sealing portion 6 holds the ball 15 in the gas sealing portion 6 and the gas sealing portion. 6 outside (opening 6
A) narrows and the gas pressure from the gas filling chamber 8 is reduced to the ball 1
5 is pressed, the gas tightness is good, and the ball 15 does not come off. Moreover, since the gas sealing portion 6 cannot be modified from the outside, careless breakage of the hermetic seal does not occur. If gas is to be released from the gas filling chamber 8, the gas can be easily released by pushing the ball 15 toward the gas filling chamber 8 using a jig.

If necessary, the plate 16 can be welded to the opening 6A (welded portion 17). By welding the opening 6A, the airtightness of the gas sealing chamber 8 can be further enhanced. Therefore, even if the gas sealing portion 6 is deformed by an impact force or the like, the gas in the gas sealing chamber 8 can be prevented from leaking to the outside.

Since the diaphragm 4 (or bellows) requires corrosion resistance and high stress, a stainless steel material is used. Accordingly, the accumulator housing 3 is made of a stainless steel material in terms of weldability with the diaphragm 4 and corrosion resistance, and the gas sealing portion 6 is also made of a stainless steel material.
The ball 15 is a steel ball. If the ball 15 is directly pressed into a general stainless steel plate, the stainless steel plate is plastically deformed. However, if the gas filling portion 6 is formed into a pipe having a predetermined length, the ball 15 is pressed into the inside.
The ball 15 can be accurately held by the elastic force (spring back) of stainless steel, and the inside of the gas sealing chamber 8 can be sealed.

FIG. 3 is a schematic sectional view of a gas filling and ball press-fitting device 18 for press-fitting the ball 15 into the gas filling portion 6. The gas filling and ball press-fitting device 18 comprises an accumulator mounting housing 19. And a sealing lid 2 screwed into the head of the accumulator mounting housing 19.
0, a ball press-fitting mechanism 21, a gas supply tank 22,
Having.

The ball press-in mechanism 21 includes a press-in piston 23
And a ball mounting pin 24.

A gas reservoir 25 is formed in the accumulator mounting housing 19, and communicates with the gas reservoir 25 to provide a gas supply passage 26 and a press-fit piston sliding hole 27.
Is formed.

In the gas charging and ball press-fitting device 18 having such a configuration, the gas storage chamber 25 of the accumulator mounting housing 19 with the gas charging portion 6 facing downward.
And put the ball 1 on the ball mounting pin 24.
5 is placed on the axis of the opening 6A. In this state, the ball 15 is stably positioned on the ball mounting pin 24 by gravity, supplies gas from the gas supply tank 22 to fill the gas reservoir 25 with gas, and operates the ball press-in mechanism 21. As a result, the ball 15 is press-fitted to a predetermined depth from the opening 6A of the gas sealing portion 6, and FIG.
Hold state.

Thus, with the gas filling chamber 8 filled with gas, the gas filling part 6 can be formed with the gas filling part closed structure 2 of the accumulator 1 in a very simple operation.

[0026]

As described above, according to the present invention, the ball is press-fitted into the gas filling portion, so that the sealing performance is good, the shape of the gas filling portion can be reduced, and the structure is simple. It is lightweight, has good workability of gas filling, and can reduce cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an accumulator 1 equipped with a gas-sealed portion sealing structure 2 according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a gas sealing part 6 (gas sealing part closed structure 2).

FIG. 3 is a schematic sectional view of a gas filling and ball press-fitting device 18 for press-fitting a ball 15 into a gas filling portion 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Accumulator (FIG. 1) 2 Gas-sealed part sealing structure of accumulator 1 (FIG. 2) 3 Accumulator housing 4 Diaphragm 5 Fuel pressure introduction part 6 Gas-sealed part 6A Opening of gas-sealed part 6 7 Fuel pressure chamber 8 Gas Enclosure chamber 9 Arc-shaped diaphragm stopper wall surface 10 Fuel pump (high-pressure pump) 11 High-pressure pipe for fuel supply 12 High-pressure branch pipe for fuel supply 13 Common rail 14 Fuel injection valve 15 Ball for sealing 16 Plate 17 Welding part 18 Gas filling and ball Press-in device (FIG. 3) 19 Housing for mounting accumulator 20 Sealing lid 21 Ball press-in mechanism 22 Gas supply tank 23 Press-in piston 24 Ball mounting pin 25 Gas reservoir 26 Gas supply path 27 Press-in piston sliding hole

Continued on the front page (72) Inventor Akinao Minegishi 3-13-26 Yayumicho, Higashimatsuyama-shi, Saitama Prefecture Inside of Zexel Higashi-Matsuyama Plant

Claims (1)

[Claims] 1. A gas-sealed portion sealed structure of an accumulator having an accumulator housing and a gas-sealed portion communicating with a gas-sealed chamber defined in the accumulator housing, wherein the gas-sealed portion has a pipe shape. A gas sealed portion of an accumulator, wherein a ball is press-fitted into the gas sealed portion to seal the gas sealed chamber.