JPWO2017126354A1 - Metal bellows type accumulator - Google Patents

Abstract

The vibration of the bellows of the metal bellows due to vibration is suppressed, and the metal bellows is prevented from being damaged.
In a metal bellows type accumulator 1 having a metal bellows 2 that divides a space in a housing 5 into a gas chamber 8 that encloses gas and a liquid chamber 9 that communicates with an oil port 3, the metal bellows 2 is movable together with expansion and contraction. In order to bring the center of gravity G of the member as close as possible to the floating end 2 b side of the metal bellows 2, the bellows cap 7, the seal member 14 and the seal holder 13 are disposed closer to the gas chamber 8 than the floating end 2 b of the metal bellows 2. In addition, the bellows cap 7 is characterized by a weighting means.

Description

  The present invention relates to an accumulator. More specifically, for example, the present invention relates to an accumulator employed in a vehicle hydraulic brake device or the like, in particular, a metal bellows accumulator.

  In a conventional metal bellows type accumulator, for example, as shown in FIG. 3, the accumulator 50 is a metal bellows type accumulator using a metal bellows as a bellows 51, and has an oil port 52 connected to a pressure pipe (not shown) at one end ( An accumulator housing 54 provided at the other end (right end in the figure) with a gas filling port 53 provided at the other end (right end in the figure) is provided, and a bellows 51 and a bellows cap 55 are disposed inside the housing 54 so that the housing 54 The interior is partitioned into a gas chamber 56 that encloses a high-pressure gas (for example, nitrogen gas) and a liquid chamber 57 that communicates with the oil port 52.

  The bellows 51 has its fixed end 51a fixed (welded) to the inner surface of the oil port member 58, which is the inner surface of the housing 54 on the oil port 52 side, and a disk-shaped bellows cap 55 fixed (welded) to its free end 51b. Therefore, the accumulator 50 is an external gas type accumulator in which the gas chamber 56 is set on the outer peripheral side of the bellows 51 and the liquid chamber 57 is set on the inner peripheral side of the bellows 51. A vibration damping ring 59 is attached to the outer periphery of the bellows cap 55 so that the bellows 51 and the bellows cap 55 do not come into contact with the inner surface of the housing 54. However, the vibration damping ring 59 does not exhibit a sealing action.

A stay (internal pedestal) 60 is disposed on the inner peripheral side of the bellows 51 and on the inner surface of the oil port member 58 that is the inner surface of the housing 54 on the oil port 52 side, and the bellows 51 is disposed on the outer peripheral side of the stay 60. Has been.
The stay 60 is fixed (welded) to the inner surface of the oil port member 58, and a liquid inlet / outlet 60b is provided at the center of the end surface portion 60a having a disk shape.
A disk-shaped gasket (seal) 62 is held on the surface of the bellows cap 55 on the stay 60 side via an annular gasket holder (seal holder) 61, and the bellows cap 55 approaches the stay 60 (left in the figure). The gasket 62 comes into close contact with the end surface portion 60a of the stay 60, whereby the space between the bellows cap 55 and the stay 60 is sealed via the gasket 62, and the liquid inlet / outlet 60b is closed. Accordingly, a part of the liquid is confined in the liquid chamber 57, and the pressure of the confined liquid and the gas pressure in the gas chamber 56 are balanced, so that excessive stress acts on the bellows 51 and the bellows 51 is damaged. (Hereinafter referred to as “prior art”; see Patent Document 1).

JP2013-194471A

In the conventional metal bellows accumulator 50 shown in FIG. 3, the vibration of the bellows 51 in the radial direction can be suppressed by the damping ring 59 at the free end 51 b of the bellows 51.
However, when the metal bellows type accumulator 50 is subjected to vibration in a direction orthogonal to the central axis c, that is, vibration in the vertical direction in FIG. 3, for example, as shown in FIG. When the vibration is received, the upward vibration is generated as indicated by an arrow 63 in the middle portion (also referred to as an abdomen) of the bellows 51 due to the mass of the liquid in the liquid chamber 57. A rotating moment acts, the bellows 51 becomes convex upward, and the upper side of the middle part (abdomen) collides with the inner wall of the housing 54.
On the contrary, as shown in FIG. 3B, when a downward vibration is received, the downward vibration is also caused in the intermediate portion (also referred to as an abdomen) of the bellows 51 due to the mass of the liquid in the liquid chamber 57. Since this occurs as shown by an arrow 64, a counterclockwise moment acts on the floating end 51b of the bellows 51, the bellows 51 is convex downward, and the lower side of the middle part (abdomen) is on the inner wall of the housing 54. collide.
Thus, when the metal bellows type accumulator 50 receives vibration in a direction orthogonal to the central axis c, the middle portion (abdomen) of the bellows 51 abuts against the inner wall of the housing 54 with a large force, and the middle of the bellows 51 There is a risk of damage to the part due to great damage.

The inventor of the present application has found that the amplitude in the middle part of the bellows with respect to vibration in the direction orthogonal to the central axis c is movable according to the expansion and contraction of the bellows such as the bellows, the bellows cap, the gasket holder, and the gasket. It has been found that the amplitude at the intermediate portion of the bellows increases as the center of gravity G of the member (including the bellows) is further away from the free end of the bellows.
In other words, the smaller the distance between the center of gravity G of the movable member and the free end, the smaller the amplitude at the intermediate portion of the bellows.

  The present invention sets the distance between the center of gravity of the movable member that moves together with the expansion and contraction of the bellows and the floating end of the bellows as small as possible, that is, by setting the center of gravity of the movable member on the floating end side of the bellows, An object of the present invention is to provide a metal bellows type accumulator in which the amplitude of the abdomen of the metal bellows due to vibration is suppressed and damage to the metal bellows is prevented.

In order to achieve the above object, a metal bellows type accumulator according to the present invention includes, firstly, a housing having an oil port connected to a pressure pipe and having a gas filling port at an end on the opposite side; The housing provided on the oil port side and provided with a liquid inlet / outlet at the end surface of the end of the cylindrical part, and provided in the housing and provided with a bellows cap, a seal member and a seal holder at the floating end In a metal bellows type accumulator comprising a metal bellows that divides an inner space into a gas chamber that encloses gas and a liquid chamber that communicates with the oil port,
In order to make the center of gravity of the movable member that moves together with the expansion and contraction of the metal bellows as close as possible to the floating end side of the metal bellows, the bellows cap, the seal member, and the seal holder are more gas than the floating end of the metal bellows. The bellows cap is disposed on the chamber side and is provided with a weighting means.
According to this feature, it is possible to provide a metal bellows type accumulator that can greatly suppress the amplitude of the middle part (abdomen) of the metal bellows and prevent the metal bellows from being damaged.

The metal bellows type accumulator of the present invention is secondly characterized in that the weight means is constituted by a weight attached to the gas chamber side of the bellows cap.
According to this feature, the amplitude of the metal bellows 2 at the specific frequency can be reduced by adjusting the size of the weight in addition to greatly suppressing the amplitude of the middle part (abdomen) of the metal bellows 2. . Furthermore, the vibration frequency of the metal bellows can be changed by changing the size of the weight. Furthermore, by attaching a weight to the gas chamber, it is not necessary to fill the gas chamber with a volume adjusting liquid in order to adjust the volume of the gas chamber, or a resin volume adjusting spacer is provided. Insertion can be made unnecessary.

Thirdly, in the metal bellows type accumulator of the present invention, in the first feature, the weighting means is formed of a metal material in which at least a part of the bellows cap has a specific gravity greater than or equal to the specific gravity of iron. It is characterized by comprising.
According to this feature, there is provided a metal bellows type accumulator capable of greatly suppressing the amplitude of the middle part (abdomen) of the metal bellows and preventing damage to the metal bellows without preparing a special member as a weighting means. Can be provided.

According to the metal bellows type accumulator of the present invention, fourthly, in the first or third feature, the weighting means is formed of a metal material in which at least a part of the seal member has a specific gravity equal to or higher than the specific gravity of iron. It is characterized by being configured.
According to this feature, there is provided a metal bellows type accumulator capable of greatly suppressing the amplitude of the middle part (abdomen) of the metal bellows and preventing damage to the metal bellows without preparing a special member as a weighting means. Can be provided.

According to the metal bellows type accumulator of the present invention, fifthly, in any one of the first, third, and fourth features, the weighting means is at least a damping ring attached to an outer peripheral portion of the bellows cap. It is characterized in that a part is formed of a metal material having a specific gravity equal to or higher than that of iron.
According to this feature, there is provided a metal bellows type accumulator capable of greatly suppressing the amplitude of the middle part (abdomen) of the metal bellows and preventing damage to the metal bellows without preparing a special member as a weighting means. Can be provided.

The present invention has the following excellent effects.
(1) To make the center of gravity of the movable member that moves together with the expansion and contraction of the metal bellows as close as possible to the floating end side of the metal bellows, the bellows cap, seal member, and seal holder are closer to the gas chamber than the floating end of the metal bellows. The bellows cap is provided with a weighting means, so that the amplitude of the middle part (abdomen) of the metal bellows can be greatly suppressed, and the metal bellows type is prevented from being damaged. An accumulator can be provided.

(2) The weighting means is constituted by a weight attached to the gas chamber side of the bellows cap, so that the amplitude of the intermediate part (abdomen) of the metal bellows 2 can be greatly suppressed, It is possible to reduce the amplitude of the metal bellows at a specific frequency by adjusting the size of. Furthermore, the vibration frequency of the metal bellows can be changed by changing the size of the weight. Furthermore, by attaching a weight to the gas chamber, it is not necessary to fill the gas chamber with a volume adjusting liquid in order to adjust the volume of the gas chamber, or a resin volume adjusting spacer is provided. Insertion can be made unnecessary.

(3) The weighting means is such that at least a part of the bellows cap is formed of a metal material having a specific gravity equal to or higher than the specific gravity of iron, so that no special member is prepared as the weighting means, and the intermediate part of the metal bellows It is possible to provide a metal bellows type accumulator that can greatly suppress the amplitude of the (abdomen) and prevent the metal bellows from being damaged.

(4) The weighting means is such that at least a part of the sealing member is formed of a metal material having a specific gravity equal to or higher than the specific gravity of iron, so that an intermediate part of the metal bellows is prepared without preparing a special member as the weighting means. It is possible to provide a metal bellows type accumulator that can greatly suppress the amplitude of the (abdomen) and prevent the metal bellows from being damaged.

(5) The weighting means is formed of a metal material having a specific gravity greater than or equal to the specific gravity of iron so that a special member is used as the weighting means because at least a part of the damping ring mounted on the outer peripheral portion of the bellows cap is formed. Without preparation, the metal bellows type accumulator can be provided in which the amplitude of the middle part (abdomen) of the metal bellows can be significantly suppressed and the metal bellows is prevented from being damaged.

It is a longitudinal cross-sectional view of the metal bellows type accumulator which concerns on Example 1 of this invention. It is a longitudinal cross-sectional view explaining a state when the metal bellows type accumulator which concerns on Example 1 of this invention receives a vibration. It is a longitudinal cross-sectional view explaining the metal bellows type accumulator of a prior art.

  EMBODIMENT OF THE INVENTION With reference to drawings, the form for implementing this invention is demonstrated illustratively based on an Example below. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

  FIG. 1 shows a vertical cross section of a metal bellows accumulator 1 according to a first embodiment of the present invention, in which a central axis c is placed in a horizontal state extending left and right, and a metal bellows 2 is expanded to a liquid storage state. is there.

  In FIG. 1, a metal bellows type accumulator 1 is a metal bellows type accumulator using a metal bellows 2 as a bellows 2 and includes an oil port 3 connected to a pressure pipe (not shown) at one end (the left end in the figure) and a gas filling port 4. Is provided at the other end (right end in the figure). The gas inlet 4 is closed with a gas plug 6 after gas injection.

  A metal bellows 2 and a bellows cap 7 are arranged inside the housing 5, and the inside of the housing 5 is partitioned into a gas chamber 8 that encloses a high-pressure gas (for example, nitrogen gas) and a liquid chamber 9 that communicates with the oil port 3. .

The metal bellows 2 has its fixed end 2a fixed (welded) to the inner surface of the oil port member 10, which is the inner surface of the housing 5 on the oil port 3 side, and a disk-shaped bellows cap 7 fixed (welded) to its free end 2b. doing.
Thereby, the outer peripheral side of the metal bellows 2 is a gas chamber 8, and the inner peripheral side of the metal bellows 2 is a liquid chamber 9.

A damping ring 11 is attached to the outer periphery of the bellows cap 7 so that the metal bellows 2 and the bellows cap 7 do not contact the inner surface of the housing 5.
The damping ring 11 does not exhibit a sealing action.

A stay (internal pedestal) 12 is disposed on the inner peripheral side of the metal bellows 2 and on the inner surface of the oil port member 10 that is the inner surface of the housing 5 on the oil port 3 side. Is arranged.
The stay 12 is made of a metal molded product, has a shape of a cylindrical portion 12a with a step 12b, is fixed (welded) to the inner surface of the oil port member 10, and has a liquid inlet / outlet at the center of the end surface portion 12c having a disk shape. 12d is provided.

A disk-like seal member 14 is held on the surface of the bellows cap 7 on the stay 12 side via an annular seal holder 13, and when the bellows cap 7 moves in a direction approaching the stay 12 (left side in the figure) The seal member 14 is in close contact with the end surface portion 12c of the stay 12, whereby the space between the bellows cap 7 and the stay 12 is sealed via the seal member 14 and the liquid inlet / outlet 12d is closed.
Therefore, a part of the liquid is confined in the liquid chamber 9 and the pressure of the confined liquid and the gas pressure in the gas chamber 8 are balanced, so that excessive stress acts on the metal bellows 2 and the metal bellows 2 is damaged. To be suppressed.
The seal member 14 is obtained by coating a rubber-like elastic body 14b on a part or all of the surface of a disk-like metal plate 14a.

The bellows cap 7 is closer to the gas chamber 8 than the floating end 2b of the metal bellows 2 in order to bring the center of gravity G of the movable member that moves together with the expansion and contraction of the metal bellows 2 as close as possible to the floating end 2b side of the metal bellows 2. It arrange | positions so that it may be located in.
In FIG. 1, the movable member includes a metal bellows 2, a bellows cap 7, a damping ring 11, a seal holder 13, and a seal member 14.

  In FIG. 1, the bellows cap 7 has an outer peripheral portion 7 a and a central portion 7 b that protrudes toward the gas chamber 8 with respect to the outer peripheral portion 7 a, and the surface of the outer peripheral portion 7 a on the liquid chamber 9 side is the free end of the metal bellows 2. 2b, and is fixed to the metal bellows 2 by welding or the like at this contact portion. A vibration damping ring 11 is mounted so that the outer peripheral portion 7a of the bellows cap 7 and the floating end 2b of the metal bellows 2 are sandwiched on the inner peripheral side and the outer peripheral side is opposed to the inner wall of the housing 5 with a slight gap. Has been.

The central portion 7b of the bellows cap 7 protrudes toward the gas chamber, a recess 7c is formed on the liquid chamber 9 side, and the seal member 14 is accommodated in the recess 7c. Further, an intermediate recess 7d for mounting the seal holder 13 is formed on the outer periphery of the recess 7c, and the seal holder 13 is mounted on the intermediate recess 7d. The depth of the intermediate recess 7d is set larger than the thickness of the seal holder 13, so that the seal holder 13 does not protrude from the surface of the liquid chamber 9 of the outer peripheral portion 7a to the liquid chamber side.
With this configuration, among the movable members attached to the floating end 2 b side of the metal bellows 2, the bellows cap 7, the seal holder 13, and the sealing member 14 are located closer to the gas chamber 8 than the floating end 2 b of the metal bellows 2. It can comprise so that it may be located in.

Further, the bellows cap 7 is provided with a weighting means for bringing the center of gravity G of the movable member that moves together with the expansion and contraction of the metal bellows 2 as close as possible to the floating end 2b side of the metal bellows 2.
In the case of Embodiment 1 shown in FIG. 1, the weighting means is constituted by a weight 15 attached to the gas chamber 8 side of the bellows cap 7 by fixing means such as welding.
The material of the weight 15 is preferably a material having a large specific gravity, for example, iron (wrought iron and cast iron), but is not limited to iron, and is more preferably a metal material having a specific gravity equal to or higher than iron.
In addition, the weight 15 has a shape of, for example, a cylindrical body, a rectangular parallelepiped, or a T-shaped member (in this case, the bottom of the vertical portion of the T-shape is in contact with the gas chamber side surface of the bellows cap 7. Any shape can be taken. The size of the weight 15 is determined by design in consideration of the frequency of vibration input to the metal bellows type accumulator.

Next, the state when the metal bellows type accumulator according to the first embodiment of the present invention receives vibration will be described with reference to FIG.
Now, assuming that downward vibration is input to the metal bellows type accumulator 1, the mass of the liquid storage inside the metal bellows 2 acts on the metal bellows 2, and the central portion of the metal bellows 2 is directed downward as indicated by an arrow W1. Push. When this downward force is applied, a moment M1 is exerted in a direction in which the lower side of the movable end portion of the metal bellows 2 is expanded as indicated by an arrow X.

The downward vibration simultaneously acts on the movable end portion of the metal bellows, the mass of the movable end portion acts on the metal bellows 2, and the lower side of the metal bellows 2 on the movable end portion side is downward as indicated by the arrow W2. Push. When this downward force is applied, a moment M2 is exerted in such a direction that the lower side of the movable end portion of the metal bellows 2 is contracted as indicated by an arrow Y.
The direction of the moment M1 acting in the direction of expanding the lower side of the movable end portion of the metal bellows 2 is opposite to the direction of the moment M2 acting in the direction of contraction, so that the center axis c in the middle portion (abdomen) of the metal bellows 2 is reversed. The amplitude in the orthogonal direction is suppressed.

  At that time, most of the movable member mounted on the floating end 2b side of the metal bellows 2 is configured to be positioned closer to the gas chamber 8 than the floating end 2b of the metal bellows 2, and the bellows cap 7 Since the weight 15 is attached to the gas chamber 8 side, the center of gravity G of the movable member that moves together with the expansion and contraction of the metal bellows is brought closer to the free end 2b side of the metal bellows 2, so The amplitude in the direction perpendicular to the central axis c in the intermediate part (abdomen) can be greatly suppressed.

  Next, experimental results of the metal bellows accumulator according to Example 1 of the present invention and the conventional metal bellows accumulator shown in FIG. 3 are shown in the following table.

  From the above results, compared to the prior art, in the metal bellows type accumulator according to the first embodiment of the present invention, most of the movable member mounted on the side of the floating end 2b of the metal bellows 2 is made to be the floating end 2b of the metal bellows 2. The movable member moves together with the expansion and contraction of the metal bellows because it is configured to be positioned closer to the gas chamber 8 than the gas bellows cap 8 and the weight 15 is attached to the bellows cap 7 on the gas chamber 8 side. Since the center of gravity G of the metal bellows 2 is close to the floating end 2b side of the metal bellows 2, it has been confirmed that the amplitude of the intermediate portion (abdomen) can be significantly suppressed.

Further, a weight 15 on the gas chamber 8 side of the bellows cap 7 serves as a weighting means for bringing the center of gravity G of the movable member that moves together with expansion and contraction of the metal bellows 2 as close as possible to the floating end 2b side of the metal bellows 2. In the configuration in which is attached, the amplitude of the metal bellows at a specific frequency can be reduced by adjusting the size of the weight 15. Further, the vibration frequency of the metal bellows can be changed by changing the size of the weight 15.
Further, by attaching the weight 15 to the gas chamber 8, it is not necessary to fill the gas chamber 8 with a volume adjusting liquid in order to adjust the volume of the gas chamber 8, or the volume made of resin It is not necessary to insert an adjustment spacer.

In the first embodiment described above, the bellows cap 7, the seal member 14, and the seal holder 13 are arranged so that the center of gravity of the movable member that moves together with the expansion and contraction of the metal bellows 2 is as close as possible to the floating end side 2 b of the metal bellows 2. Is provided on the gas chamber side of the floating end 2b of the metal bellows 2 and the bellows cap 7 is provided with a weighting means constituted by a weight 15 attached to the gas chamber 8 side. There are effects like this.
(1) The metal bellows type accumulator can be provided in which the amplitude of the intermediate portion (abdomen) of the metal bellows 2 can be significantly suppressed and the metal bellows is prevented from being damaged.
(2) By adjusting the size of the weight 15, it is possible to reduce the amplitude of the metal bellows at a specific frequency. Further, the vibration frequency of the metal bellows can be changed by changing the size of the weight 15.
(3) By attaching the weight 15 to the gas chamber 8, it is not necessary to fill the gas chamber 8 with a volume adjusting liquid in order to adjust the volume of the gas chamber 8, or It is not necessary to insert a volume adjusting spacer.

In the second embodiment, in the metal bellows type accumulator of the first embodiment shown in FIG. 1, the center of gravity G of the movable member that moves together with the expansion and contraction of the metal bellows 2 is made as close as possible to the floating end 2 b side of the metal bellows 2. For the weighting means, instead of the weight 15 mounted on the gas chamber 8 side of the bellows cap 7, at least a part of the bellows cap 7 is formed of a metal material having a specific gravity equal to or higher than the specific gravity of iron. Although different from the first embodiment in the configuration, it is the same as the first embodiment in other points.
That is, the metal bellows type accumulator of the second embodiment is similar to the first embodiment in that the center of gravity of the movable member that moves together with the expansion and contraction of the metal bellows 2 is as close as possible to the floating end side 2b of the metal bellows 2. The cap 7, the seal member 14, and the seal holder 13 are disposed closer to the gas chamber than the floating end 2 b of the metal bellows 2.
Then, at least a part of the bellows cap 7 is formed of a metal material having a specific gravity equal to or higher than that of iron, so that the center of gravity of the movable member is brought close to the floating end side 2b of the metal bellows 2. As the bellows cap 7, for example, the whole is made of iron or a material having a higher specific gravity than iron, and a material having a higher specific gravity than iron, such as lead or copper, is attached to the surface to increase the weight of the bellows cap 7. May be.
According to the present embodiment, without preparing a special member as a weighting means, the amplitude of the middle part (abdomen) of the metal bellows 2 can be greatly suppressed, and the metal bellows type can be prevented from being damaged. An accumulator can be provided.

In the third embodiment, in the metal bellows type accumulator of the first embodiment shown in FIG. 1, the center of gravity G of the movable member that moves together with the expansion and contraction of the metal bellows 2 is made as close as possible to the floating end 2 b side of the metal bellows 2. For the weighting means, instead of the weight 15 mounted on the gas chamber 8 side of the bellows cap 7, at least a part of the seal member 14, specifically, the disk-shaped metal plate 14a is more than the specific gravity of iron. Although it differs from Example 1 by the point comprised by forming with the metal material which consists of specific gravity of this, it is the same as Example 1 in another point.
That is, the metal bellows type accumulator of the third embodiment is similar to the first embodiment in that the center of gravity of the movable member that moves together with the expansion and contraction of the metal bellows 2 is as close as possible to the floating end side 2b of the metal bellows 2. The cap 7, the seal member 14, and the seal holder 13 are disposed closer to the gas chamber than the floating end 2 b of the metal bellows 2.
Then, at least a part of the seal member 14 is formed of a metal material having a specific gravity equal to or higher than the specific gravity of iron, so that the center of gravity of the movable member is brought close to the floating end side 2 b of the metal bellows 2. As the disk-shaped metal plate 14a, for example, the whole is composed of iron or a material having a higher specific gravity than iron, or a material having a higher specific gravity than iron, such as lead or copper, is attached to the surface, and the weight of the sealing member 14 May be increased.
According to the present embodiment, without preparing a special member as a weighting means, the amplitude of the middle part (abdomen) of the metal bellows 2 can be greatly suppressed, and the metal bellows type can be prevented from being damaged. An accumulator can be provided.

In the fourth embodiment, in the metal bellows type accumulator of the first embodiment shown in FIG. 1, the center of gravity G of the movable member that moves together with the expansion and contraction of the metal bellows 2 is brought as close as possible to the floating end 2b side of the metal bellows 2. For the weighting means, instead of the weight 15 attached to the bellows cap 7 on the gas chamber 8 side, at least a part of the damping ring 11 attached to the outer peripheral portion of the bellows cap 7 is equal to or more than the specific gravity of iron. Although it differs from Example 1 by the point comprised by forming with the metal material which consists of specific gravity of this, it is the same as Example 1 in another point.
That is, the metal bellows type accumulator of the fourth embodiment is similar to the first embodiment in that the center of gravity of the movable member that moves together with the expansion and contraction of the metal bellows 2 is as close as possible to the floating end side 2b of the metal bellows 2. The cap 7, the seal member 14, and the seal holder 13 are disposed closer to the gas chamber than the floating end 2 b of the metal bellows 2.
And the damping ring 11 is formed by being formed of a metal material having a specific gravity equal to or higher than that of iron, so that the center of gravity of the movable member is brought closer to the floating end side 2b of the metal bellows 2. Yes. As the damping ring 11, for example, it is preferable to increase the weight of the damping ring 11 by attaching a material having a specific gravity larger than that of iron, such as lead or copper, in addition to being composed entirely of iron.
According to the present embodiment, without preparing a special member as a weighting means, the amplitude of the middle part (abdomen) of the metal bellows 2 can be greatly suppressed, and the metal bellows type can be prevented from being damaged. An accumulator can be provided.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

DESCRIPTION OF SYMBOLS 1 Metal bellows type accumulator 2 Metal bellows 2a Fixed end 2b Floating end 3 Oil port 4 Gas filling port 5 Housing 6 Gas plug 7 Bellows cap 7a Outer peripheral part 7b Central part 7c Recessed part 7d Intermediate recessed part 8 Gas chamber 9 Liquid chamber 10 Oil port member 11 Damping ring 12 Stay (internal pedestal)
12a Cylindrical part 12b Step 12c End face part 12d Liquid inlet / outlet 13 Seal holder 14 Seal member 14a Metal plate 14b Rubber elastic body 15 Weight G Center of gravity of movable member L Bellows length of metal bellows d From free end of metal bellows to movable member Distance to the center of gravity

Claims (5)

A housing having an oil port connected to the pressure pipe and having a gas inlet at the opposite end, and a liquid disposed on the end of the cylindrical portion disposed on the oil port side in the housing A stay provided with an inlet / outlet; a gas chamber that is disposed in the housing and includes a bellows cap, a seal member, and a seal holder at a floating end; and a liquid chamber that communicates gas in the space in the housing; In the metal bellows type accumulator with the metal bellows partitioned into
In order to make the center of gravity of the movable member that moves together with the expansion and contraction of the metal bellows as close as possible to the floating end side of the metal bellows, the bellows cap, the seal member, and the seal holder are more gas than the floating end of the metal bellows. A metal bellows type accumulator which is disposed on the chamber side and is provided with a weighting means on the bellows cap.   2. The metal bellows accumulator according to claim 1, wherein the weighting unit includes a weight attached to the gas chamber side of the bellows cap.   2. The metal bellows accumulator according to claim 1, wherein the weighting unit is configured by forming at least a part of the bellows cap with a metal material having a specific gravity equal to or higher than a specific gravity of iron.   The metal bellows type accumulator according to claim 1 or 3, wherein the weighting means is configured by forming at least a part of the seal member with a metal material having a specific gravity equal to or higher than a specific gravity of iron. . The weighting means is configured by forming at least a part of a damping ring attached to an outer peripheral portion of the bellows cap by a metal material having a specific gravity equal to or higher than a specific gravity of iron. The metal bellows type accumulator according to any one of 1, 3, and 4.

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