JP2602364Y2 - Accumulator device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accumulator device suitable for absorbing pulsation of hydraulic pressure in equipment using hydraulic pressure such as various hydraulic devices.

[0002]

2. Description of the Related Art In a conventional hydraulic circuit using a hydraulic source such as a hydraulic pump, an accumulator device 100 as shown in FIG. 7 is sometimes used as a means for absorbing a hydraulic pulsation generated by the pump. The accumulator device 100 includes a pump 101 and a piping 101 forming a hydraulic circuit.
Is mounted via a screw-in type joint part 102 in the middle of the step. Inside the outer cylinder 104 as a pressure vessel,
And a gas chamber 106 filled with high-pressure gas.
And a partition member 107 such as a bellows for separating the oil chamber 105 and the air chamber 106 from each other.

[0003] The pressure of oil discharged from a hydraulic pressure generating device 110 such as a pump acts on an air chamber 106 via a pipe 101 and an oil chamber 105, and the air chamber 106 expands and contracts according to the magnitude of the oil pressure. The pulsation is smoothed. Atmospheric pressure acts on the outer surface of the outer cylinder 104. In the case of the accumulator device 100, since a differential pressure between the pressure of the gas or oil inside the outer cylinder 104 and the atmospheric pressure acts on the outer cylinder 104, a strong outer cylinder 104 that can withstand the differential pressure is required. .

[0004]

In the accumulator 100 for absorbing pulsation as described above, the pressure of the gas or oil contained therein is several tens kgf / cm ^2. If the pressure is too high, the outer cylinder 104 as a pressure vessel
In order to provide a predetermined pressure resistance to the outer cylinder 104, the thickness of the outer cylinder 104 is considerably increased. This causes the accumulator device 100 to be heavy and large.

[0005] In addition, the screw-in joint 102
Since attachment to the pipe 101 or hydraulic equipment is performed, special consideration is required for the processing of the joint portion 102 and sealing means. For this reason, there are problems that the processing and the assembling process are troublesome and the cost is high. Therefore, the purpose of the present invention is to make it possible to reduce the thickness of parts,
An object of the present invention is to provide a compact and lightweight accumulator device.

[0006]

SUMMARY OF THE INVENTION An accumulator device according to the present invention, developed to achieve the above object, comprises a body of a hydraulic device constituting a hydraulic circuit, and an outer cylinder inserted into an accumulator accommodating hole provided in the body. A member and outside
The hydraulic circuit between the peripheral surface and the inner surface of the accumulator receiving hole
An outer cylindrical member into which the liquid in the path can enter, a first end member fixed to one end of the outer cylindrical member, and a first end member fixed to the other end of the outer cylindrical member.
A fixed second end member, a bellows and a bellows cap housed inside the outer cylinder member, wherein a liquid chamber is formed between an outer surface of the bellows and an inner surface of the outer cylinder member; A partition member forming an air chamber on the inner surface side of the gas supply port; a gas supply port provided in the second end member and communicating with the air chamber; a gas sealing plug for closing the gas supply port; A liquid introduction port provided in the member and communicating with the flow chamber and the liquid chamber formed in the body, and a sealing means including a cap body and a sealing material for closing an opening of the accumulator accommodating hole ; Distribution
The outer surface of the outer cylinder member and the accumulator housing through a hole
The hydraulic circuit liquid that enters between the inner surface of the hole and the sealing material
Is to be sealed. It should be noted that reference numerals described in the claims of the present invention for utility model registration are merely added to facilitate understanding of the present invention, and do not limit the scope of rights of the present invention.

[0007]

The hydraulic pressure generated in the hydraulic circuit acts on the entire outer surface of the accumulator device through the flow hole of the body and also acts on the liquid chamber inside the accumulator device. When the oil pressure becomes higher than the gas pressure in the air chamber, the oil flows into the liquid chamber through the liquid introduction port, and the oil is blocked in the direction in which the air chamber contracts.
Rose bends. The pulsating component of the hydraulic pressure is absorbed by the expansion and contraction of the air chamber. In this accumulator device, the oil
Is the hydraulic pressure used for the pressure circuit both on the outer surface and the inner surface of the outer cylinder member?
Pressure difference between the inside and outside of the outer cylinder member.
do not do. In other words, the pressure generated in the hydraulic circuit compresses the bellows.
The hydraulic circuit is used on the outer side of the outer cylinder member.
The body of hydraulic equipment that has sufficient rigidity against hydraulic pressure
To prevent the outer cylinder member and end member from bending.
Is done. For this reason, the outer cylinder member and the end member are incorporated into the body.
If it is rigid enough to withstand the gas pressure in the front chamber,
Pressure resistance is lower than the hydraulic pressure used in the hydraulic circuit.
No.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. The accumulator device 10 shown in FIG. 1 is housed in an accumulator housing hole 12 provided in a block-shaped metal body 11 of a hydraulic device constituting a hydraulic circuit such as a pump and a valve. As shown in an example in FIG. 2, the body 11 forms a main body of various hydraulic devices 13 and has sufficient rigidity with respect to the working pressure of the hydraulic devices 13.

The hydraulic equipment 13 is, for example, various equipment having a hydraulic circuit such as a hydraulic suspension of an automobile, an anti-skid brake device, or a hydraulic power steering device, and is not limited to the illustrated example. Body 1
Hydraulic oil used in the hydraulic device 13 flows through the flow hole 15 formed in the first hydraulic device 1. One end of the accumulator accommodation hole 12 communicates with the circulation hole 15. The other end of the accumulator accommodating hole 12 is open to the outer peripheral surface of the body 11.

As shown in FIG. 3 and the like, the accumulator device 10 includes a metal cylindrical outer cylinder member 20 and a first metal cylinder welded to one end side (left side in the figure) of the outer cylinder member 20.
End member 21, a second metal end member 22 welded to the other end side (right side in the figure) of outer cylinder member 20, and outer cylinder member 20.
And a partition member 23 accommodated in the inside. The outer cylinder member 20 has a rigidity enough to withstand the pressure of the gas sealed in the air chamber 35 described below for a reason to be described later, but has a rigidity less than the working pressure when the hydraulic device 13 functions. Good.

The partition member 23 is made of a metal bellows 25.
And a bellows cap 26. Bellows 25
Is extendable and contractible in the axial direction of the outer cylinder member 20. The fixed side end 27 of the bellows 25 is hermetically joined to the second end member 22 by welding or the like. At the other end of the bellows 25,
A bellows guide 28 made of a synthetic resin or the like having a small friction coefficient is attached. The outer peripheral portion of the bellows guide 28 is in sliding contact with the inner peripheral surface of the outer tubular member 20 so that the bellows 25 can smoothly expand and contract in the axial direction. The bellows 25 may be a polymer film such as a synthetic resin as long as it has gas barrier properties.

The inside of the partition member 23 is used as an air chamber 35 in which an inert gas such as nitrogen is sealed at a pressure higher than the atmospheric pressure. The gas sealed in the air chamber 35 is supplied to the air chamber 35 through a gas supply port 36 provided in the second end member 22. After the gas is supplied, the gas supply port 36 is airtightly closed by a gas sealing plug 37 using a bolt or the like. A sealing member 38 such as an O-ring is provided on the gas sealing plug 37.

A space surrounded by the outer peripheral surface of the partition member 23, the inner peripheral surface of the outer cylinder member 20, and the end member 21 is used as a liquid chamber 40. The liquid chamber 40 communicates with the flow hole 15 of the body 11 through a liquid introduction port 41 provided in the first end member 21, and oil can flow in and out between the liquid chamber 40 and the flow hole 15. It has become.

A sealing member 4 made of a rubber-like elastic material such as an elastomer is provided on the surface of the bellows cap 26 on the liquid chamber 40 side.
5 are provided. As shown in FIG. 3, the accumulator device 10 is provided with the seal member 45 as a single unit.
When the gas is supplied to the air chamber 35, the partition member 23 extends by the pressure of the gas in the air chamber 35 until it abuts against the end member 21, so that the liquid introduction port 41 can be closed in a liquid-tight manner. By doing so, between the outer peripheral surface of the bellows 25 and the inner peripheral surface of the outer cylinder member 20, the backup oil previously injected is sealed, and the outer surface of the bellows 25 is sealed by this sealed backup oil. Because of the support, the bellows 25 is prevented from being excessively deformed by the gas pressure.

As shown in FIG. 1, with the accumulator device 10 inserted into the accumulator housing hole 12, the opening of the accumulator housing hole 12 is closed by a cap body 50 as a sealing means. The cap body 50 is housed in an annular groove 51 along the circumferential direction.
Sealing material 52 such as a ring, and accumulator accommodating hole 12
Has an external thread 54 to be screwed into the internal thread 53 provided in the opening of.

The cap body 50 is provided with the hydraulic device 13.
Has sufficient rigidity with respect to the hydraulic pressure used when it functions and the liquid-tightness of the seal material 52. Cap body 50
A square hole 57 is formed on the outer end face of the. This square hole 5
7 is a case in which the cap body 50 is
When screwing into a jig, the end of a jig such as a hexagon wrench is inserted. A concave portion 58 for accommodating the head of the gas sealing plug 37 is provided on the back side of the cap body 50.
Is provided.

The inner diameter of the accumulator accommodating hole 12 is formed such that the outer cylindrical member 20 can be just accommodated. The length of the accumulator housing hole 12 in the axial direction is a sum of the total length of the accumulator device 10 and the thickness of the cap body 50. Therefore, the accumulator device 1
When the cap body 50 is screwed to a predetermined position in a state where the “0” is accommodated, the position of the outer end surface of the cap body 50 becomes substantially flush with the outer surface of the body 11.

Before the accumulator device 10 having the above configuration is incorporated in the hydraulic equipment 13, gas is sealed in the air chamber 35 by itself as shown in FIG. Therefore, the outer cylinder member 20 and the end members 21 and 22 as the pressure vessel have rigidity to withstand the sealed gas pressure. After gas filling, the accumulator device 10 is inserted into the accumulator accommodating hole 12 and is sealed by the cap body 50.

In the above state, when the hydraulic pressure acts on the flow hole 15 of the body 11 due to the function of the hydraulic device 13, the hydraulic pressure acts on the entire outer surface of the accumulator device 10. This oil pressure is completely sealed by the body 11 and the cap body 50 having sufficient rigidity to the used oil pressure.

The hydraulic pressure also acts on the liquid chamber 40 of the accumulator device 10 through the flow hole 15. Hydraulic pressure is air chamber 3
When the pressure exceeds the gas pressure of 5, a part of the oil flowing through the flow hole 15 flows into the liquid chamber 40 and bends in a direction in which the bellows 25 is compressed. When the pressure acting on the liquid chamber 40 becomes lower than the gas pressure in the gas chamber 35, the bellows 25 bends in the extending direction. By this gas spring action, the hydraulic pulsation is smoothed.

In the accumulator device 10,
A pressure difference between the inside and outside of the outer cylinder member 20 and the end members 21 and 22 constituting the pressure vessel is basically not generated. Therefore, the outer cylinder member 20
Even pressure resistance is lower than the working pressure of the hydraulic device 13, the outer surface of the accumulator 10 (i.e. the outer tubular member
20) (external surface) is oiled and has high rigidity
1, the outer cylinder member 2
0 and the pressure resistance of the end members 21 and 22 are not insufficient.
The outer peripheral surface of the outer cylindrical member 20 and the accumulator accommodating hole 1
2, the gap into which the fluid of the hydraulic circuit enters
Is due to the sealing material 52 provided on the cap body 50.
Is sealed.

The accumulator device 10 has a body 1
Before the hydraulic pressure is applied to the outer cylinder member 20 and the end members 21 and 21 as pressure vessels,
2, the outer cylinder member 20 and the end members 21 and 22 only need to have a rigidity that can withstand the sealed gas pressure, and can be made with a rigidity lower than the rigidity against the working pressure. This makes it possible to reduce the thickness of each component (the outer cylinder member 20 and the end members 21 and 22) constituting the pressure vessel. Moreover,
The screw-in type joint 102 required in the case of the conventional device (see FIG. 7) is not required.

FIG. 4 shows a second embodiment of the present invention. In the accumulator device 70 of this embodiment, a second end member 71 serving also as a cap body is used.
The end member 71 is welded to the outer cylinder member 20. The end member 71 is a cap body 5 used in the first embodiment.
0 and the second end member 22 are integrated, and also serve as a sealing means for closing the opening of the accumulator accommodating hole 12. The gas supply port 36 is provided in the end member 71. The gas supply port 36 is closed by a gas sealing plug 37 after supplying gas to the air chamber 35.

A first annular groove 73 and a second annular groove 74 extending in the circumferential direction are formed on the outer peripheral portion of the end member 71 serving also as the cap.
And a first annular groove 73 located on the inner side.
And a sealing material 76 such as an O-ring is accommodated therein. Second
A retaining ring 77 such as a C-ring is accommodated in the annular groove 74. The retaining ring 77 has a function of retaining the accumulator device 70 on the body 11 by being engaged with a circumferential annular groove 78 provided near the entrance of the accumulator accommodating hole 12. The configuration, operation, and effects other than those described above are the same as those of the first embodiment.

FIG. 5 shows a third embodiment of the present invention. An accumulator device 80 of this embodiment has a partition member 82 using a bellows 81 having the following shape.
0, and the outside of the partition member 82 is used as the air chamber 35. The fixed end portion 83 of the bellows 81 is hermetically joined to the first end member 21 by welding or the like, and a bellows cap 84 is provided on the other end side of the bellows 81.

As shown in FIG.
In the figure, a plurality of diaphragm-shaped pleat walls are formed in the axial direction of the bellows 81. Since the diaphragm-shaped pleat walls can be compressed until they come into close contact with each other, the contact length of the bellows 81 can be extremely short.
The configuration, operation, and effects other than those described above are the same as those of the first embodiment.

[0027]

According to the present invention , the accumulator device is
The outer cylinder member and the end member that constitute the accumulator device
Withstands the gas filling pressure in the air chamber before incorporating it into the body
The rigidity required for the outer cylinder member and the end member may be lower than that of the conventional device, so that the thickness of the component may be thinner, and the size and weight may be reduced.
Further, the accumulator device of the present invention does not require a joint for attachment to a pipe or the like, and therefore has a simpler structure and easier sealing measures than a conventional device using a screw-in type joint.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a part of a hydraulic apparatus having an accumulator device according to a first embodiment of the present invention.

FIG. 2 is an overall perspective view of the hydraulic device shown in FIG. 1;

FIG. 3 is a sectional view showing a state before the accumulator device shown in FIG. 1 is incorporated into a hydraulic device.

FIG. 4 is a longitudinal sectional view of a part of a hydraulic device including an accumulator device according to a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a part of a hydraulic device having an accumulator device according to a third embodiment of the present invention.

FIG. 6 is a sectional view of a part of a bellows used in the accumulator device shown in FIG. 5;

FIG. 7 is a longitudinal sectional view showing a conventional accumulator device.

[Explanation of symbols]

10: accumulator device, 11: body of hydraulic equipment,
12: accumulator accommodation hole, 15: circulation hole, 20: outer cylinder member, 21: first end member, 22: second end member, 2
3 ... partition member, 35 ... air chamber, 36 ... gas supply port, 37
... gas sealing stopper, 40 ... liquid chamber, 41 ... liquid introduction port, 50
... cap body, 70 ... accumulator device, 71 ...
End member also serving as cap, 80 ... accumulator device, 8
2. Partition member.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 4-11901 (JP, U) JP-A 60-3271 (JP, U) JP-B 45-8128 (JP, B1) 504159 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F15B 1/08

Claims (1)

(57) [Scope of request for utility model registration] 1. A body of a hydraulic device constituting a hydraulic circuit.
And the accumulator receiving hole (12) provided in this body (11 )
The outer peripheral surface thereof and Accu an outer tubular member (20) to be inserted into
The liquid of the above hydraulic circuit is filled between the inner surface of the
An outer cylindrical member (20) that can be inserted, a first end member (21) fixed to one end of the outer cylindrical member (20), and a second end member fixed to the other end of the outer cylindrical member (20). End member (22) and the outer cylinder member
A liquid chamber (40) is formed between the outer surface of the bellows (25) and the inner surface of the outer cylinder member (20) having a bellows (25) and a bellows cap (26) housed inside the (20). And a partition member forming an air chamber (35) on the inner surface side of the bellows (25).
(23) and the air chamber provided on the second end member (22).
(35) a gas supply port (36) communicating with the gas supply port (36)
And a liquid inlet provided in the first end member (21) and communicating with the flow hole (15) formed in the body (11) and the liquid chamber (40). Port (41) and cap body (50) for closing the opening of the accumulator receiving hole (12)
Comprising a sealing means including a sealing material (52) (76), the flow
Through the through hole (15), the outer surface of the outer cylindrical member (20) and the accumulator
Fluid in the hydraulic circuit that enters between the inside of the
The accumulator device is sealed by the seal members (52) and (76) .