JPS63203901A - Diaphragm for accumulator - Google Patents
Diaphragm for accumulatorInfo
- Publication number
- JPS63203901A JPS63203901A JP62034942A JP3494287A JPS63203901A JP S63203901 A JPS63203901 A JP S63203901A JP 62034942 A JP62034942 A JP 62034942A JP 3494287 A JP3494287 A JP 3494287A JP S63203901 A JPS63203901 A JP S63203901A
- Authority
- JP
- Japan
- Prior art keywords
- diaphragm
- accumulator
- thin film
- gas
- metal thin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010409 thin film Substances 0.000 claims abstract description 29
- 229910052751 metal Inorganic materials 0.000 claims description 33
- 239000002184 metal Substances 0.000 claims description 33
- 239000007788 liquid Substances 0.000 claims description 19
- 239000002131 composite material Substances 0.000 claims description 7
- 239000010408 film Substances 0.000 claims description 5
- 230000035699 permeability Effects 0.000 abstract description 7
- 238000005452 bending Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 41
- 239000003921 oil Substances 0.000 description 15
- 229920000459 Nitrile rubber Polymers 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 239000005062 Polybutadiene Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 239000012209 synthetic fiber Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Landscapes
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、アキュムレータ用ダイヤフラムに関し、特に
ガス透過性が低く、例えば、油圧機械や車両の油圧車高
調整装置の油圧アキュムレータなどに使用するのに適し
たダイヤプラムに関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a diaphragm for an accumulator, and has particularly low gas permeability, and is suitable for use in, for example, a hydraulic accumulator of a hydraulic vehicle height adjustment device for a hydraulic machine or vehicle. Concerning diaphragms suitable for.
（従来の技術）
従来から、油圧の脈動防止及び圧油貯蔵を目的として、
液体室と所定の圧力に与圧された気体室との間に拡縮自
在なダイヤフラムを設けたアキュムレータが使用されて
いる。この場合、ダイヤフラムとして、通常合成ゴム弾
性体が用いられており、しかもダイヤフラムの厚さは応
答性の点でできるだけ薄いことが望ましい。一方、気体
室内の気体（空気、窒素ガス等）は、気体圧力、温度、
ダイヤフラム面積に比例し、ダイヤフラムの厚さに反比
例してダイヤフラムを透過し、液体室内の油に溶解する
。この油は油圧装置（アクチュエータ）等に作用した後
、循環再使用されるが、通常、オープン回路、即ち大気
中にドレインする回路で循環されるため、一旦、油中に
溶解した気体が大気圧下で放出され、油中の気体濃度が
低下した状態で再度アキュムレータを通る。その結果、
気体室内の気体がダイヤフラムを透過して、再度油に溶
解し、この操作がくり返されているうちに、気体室内の
圧力が所定圧を割ってしまい、アキュムレータの機能が
低下することになる。(Prior art) Conventionally, for the purpose of preventing hydraulic pulsation and storing pressure oil,
An accumulator is used in which an expandable and contractible diaphragm is provided between a liquid chamber and a gas chamber pressurized to a predetermined pressure. In this case, a synthetic rubber elastic body is usually used as the diaphragm, and the thickness of the diaphragm is desirably as thin as possible from the viewpoint of responsiveness. On the other hand, the gas in the gas chamber (air, nitrogen gas, etc.)
It passes through the diaphragm in proportion to the diaphragm area and inversely proportional to the diaphragm thickness and dissolves in the oil in the liquid chamber. This oil is circulated and reused after acting on hydraulic equipment (actuators), etc., but normally it is circulated in an open circuit, that is, a circuit that drains into the atmosphere, so that once the gas dissolved in the oil reaches atmospheric pressure. The oil is released at the bottom and passes through the accumulator again with a reduced gas concentration in the oil. the result,
The gas in the gas chamber passes through the diaphragm and dissolves in the oil again, and as this operation is repeated, the pressure in the gas chamber falls below a predetermined pressure, resulting in a decline in the function of the accumulator.
かかる欠点を解消するために、ダイヤフラム表面に合成
樹脂をコーティングする方法、ダイヤフラム内にナイロ
ン等の合成繊維コードを入れる方法などが提案されてい
る。In order to overcome these drawbacks, methods have been proposed such as coating the diaphragm surface with a synthetic resin and inserting a synthetic fiber cord such as nylon into the diaphragm.
（発明が解決しようとする問題点）
しかしながら、表面に合成樹脂をコーティングしたダイ
ヤフラムでは、気体透過性を十分に低下させるためには
、樹脂コーティング層を厚くする必要があることから、
比較的弾性の低い樹脂層がダイヤフラムの拡縮にともな
いくり返し変形を受けて破壊してしまい、耐久性の点で
実用的でないという問題がある。(Problems to be Solved by the Invention) However, in a diaphragm whose surface is coated with synthetic resin, in order to sufficiently reduce gas permeability, it is necessary to thicken the resin coating layer.
There is a problem in that the resin layer, which has relatively low elasticity, is repeatedly deformed and destroyed as the diaphragm expands and contracts, making it impractical in terms of durability.
また、内部に合成繊維コードを入れたダイヤフラムは、
強度及び耐久性の点では優れているが、気体透過性を低
下させる効果は少ない。In addition, the diaphragm has a synthetic fiber cord inside,
Although it is excellent in terms of strength and durability, it has little effect on reducing gas permeability.
本発明の目的は、かかる従来のアキュムレータ用ダイヤ
フラムの問題点を解消し、耐久性に優れ、かつ気体透過
性の低いアキュムレータ用ダイヤフラムを提供すること
にある。An object of the present invention is to solve the problems of the conventional accumulator diaphragm and to provide an accumulator diaphragm that has excellent durability and low gas permeability.
（問題点を解決するための手段）
本発明者等は、上記目的を達成すべく鋭意検討を重ねた
結果、ダイヤフラムとして、弾性部材と金属薄膜との複
合体を使用すればよいことを見出し本発明に到達した。(Means for Solving the Problems) As a result of extensive studies to achieve the above object, the inventors of the present invention discovered that a composite of an elastic member and a metal thin film could be used as the diaphragm. invention has been achieved.
即ち、本発明は、アキュムレータの液体室と気体室とを
区画するダイヤフラムにおいて、該ダイヤフラムが、弾
性部材と金属薄膜との複合体で形成されていることを特
徴とするアキュムレータ用ダイヤフラムである。That is, the present invention provides a diaphragm for an accumulator, in which the diaphragm partitions a liquid chamber and a gas chamber of the accumulator, and the diaphragm is formed of a composite of an elastic member and a metal thin film.
以下、図面に基づいて本発明を説明する。The present invention will be explained below based on the drawings.
第１図は本発明のダイヤフラムを装着したアキュムレー
タの例を示す一部縦断面図であり、■はアキュムレータ
本体、２は気体室、３は液体室、４は気体室２と液体室
３とを区画するダイヤフラム、５は気体室２へ気体を導
入して気体室２内を所定の圧力にするための気体導入口
、６は作動油を液体室３へ導入するための液体導入口、
７はダイヤフラム４が大きく変形して液体導入口６の部
分に接触した際に、ダイヤフラム４が損傷するのを防ぐ
ために設けたプロテクタ、８は気体室２へ気体を導入し
て所定の圧力にした後、気体導入口５を密封するための
プラグである。ダイヤフラム４は、弾性部材９と金属薄
膜１０との複合体で構成されている。弾性部材９として
は、任意の弾性体を使用することができるが、例えば、
アクリロニトリルブタジェンゴム（ＮＢＲ）、スチレン
ブタジェンゴム（ＳＢＲ）、ブタジェンゴム（Ｂ Ｒ）
、エチレンプロピレンゴム（ＥＰＤＭ） 、ウレタンゴ
ム等の合成弾性体が好適に用いられる。一方、金属薄膜
１０としては、薄膜化が可能な任意の金属を用いること
ができるが、例えば、アルミニウム、銅等が好ましく用
いられる。金属薄膜１０の厚さは金属の種類によっても
異なるが、可撓性が失われず、かつ繰返し変形に対して
十分な強度を有するようにするため、通常５〜１００μ
ｍの範囲内とするのが適当である。金属薄膜１０は、例
えば第２図に示すような形状に成形されており、弾性部
材９と複合されている。金属薄膜１０を弾性部材９と複
合させるには、金属薄膜１０を弾性部材９内に埋設して
もよいし、金属薄膜１００両面に弾性部材９をサンドイ
ッチ状に積層させてもよい。金属薄膜１０と弾性部材９
とは、通常、加硫によって接着される。金属薄膜１０に
は、ダイヤフラム４の拡縮にともない変形応力が集中し
て金属薄膜１０が破損するのを防ぐために、あらかじめ
変形応力吸収用のスリット１１を設けておくのが好まし
い。スリット１１の形状、配列は任意であり、例えば第
３図及び第４図に示すようにスリット１１を形成するこ
とができる。ダイヤフラム４の拡縮にともなう変形応力
は、第３図及び第４図に示す矢印の方向にスリット１１
が動くことによって吸収され、金属薄膜１０の破損が防
止される。このスリン）１１の合計面積は気体の透過を
おさえるうえで、金属薄膜１０の全面積の２０％以下、
特に１０％以下とするのが望ましい。FIG. 1 is a partial vertical sectional view showing an example of an accumulator equipped with the diaphragm of the present invention, where ■ indicates the accumulator main body, 2 indicates the gas chamber, 3 indicates the liquid chamber, and 4 indicates the gas chamber 2 and the liquid chamber 3. 5 is a gas introduction port for introducing gas into the gas chamber 2 to bring the inside of the gas chamber 2 to a predetermined pressure; 6 is a liquid introduction port for introducing hydraulic oil into the liquid chamber 3;
7 is a protector provided to prevent the diaphragm 4 from being damaged when the diaphragm 4 is greatly deformed and comes into contact with the liquid inlet 6; 8 is a protector provided to introduce gas into the gas chamber 2 to a predetermined pressure. The latter is a plug for sealing the gas inlet 5. The diaphragm 4 is composed of a composite body of an elastic member 9 and a thin metal film 10. Any elastic body can be used as the elastic member 9, but for example,
Acrylonitrile butadiene rubber (NBR), styrene butadiene rubber (SBR), butadiene rubber (BR)
Synthetic elastic bodies such as , ethylene propylene rubber (EPDM), and urethane rubber are preferably used. On the other hand, as the metal thin film 10, any metal that can be made thin can be used, and for example, aluminum, copper, etc. are preferably used. The thickness of the metal thin film 10 varies depending on the type of metal, but is usually 5 to 100 μm in order to maintain flexibility and have sufficient strength against repeated deformation.
It is appropriate to set it within the range of m. The metal thin film 10 is formed into a shape as shown in FIG. 2, for example, and is combined with the elastic member 9. In order to combine the metal thin film 10 with the elastic member 9, the metal thin film 10 may be embedded in the elastic member 9, or the elastic member 9 may be laminated on both sides of the metal thin film 100 in a sandwich manner. Metal thin film 10 and elastic member 9
are usually bonded by vulcanization. In order to prevent the metal thin film 10 from being damaged due to concentration of deformation stress as the diaphragm 4 expands and contracts, it is preferable to provide a slit 11 for absorbing deformation stress in advance. The shape and arrangement of the slits 11 are arbitrary, and the slits 11 can be formed as shown in FIGS. 3 and 4, for example. The deformation stress caused by the expansion and contraction of the diaphragm 4 is applied to the slit 11 in the direction of the arrow shown in FIGS. 3 and 4.
is absorbed by the movement, and damage to the metal thin film 10 is prevented. In order to suppress gas permeation, the total area of this Surin) 11 is 20% or less of the total area of the metal thin film 10,
In particular, it is desirable that it be 10% or less.
また、第５図に示すように、ダイヤフラム４を波状の金
属薄膜１０と弾性体９との複合体で構成すると、ダイヤ
フラム４の繰返し変形によっても金属薄膜１０の破損が
起り難くなるので望ましい。Further, as shown in FIG. 5, it is preferable that the diaphragm 4 be constructed of a composite body of a corrugated thin metal film 10 and an elastic body 9, since this makes it difficult for the thin metal film 10 to be damaged even by repeated deformation of the diaphragm 4.
勿論ダイヤフラム４の変形が少なく、金属薄膜１０にご
くわずかな歪しか生じない場合は、金属薄膜１０にスリ
ットを設ける必要はない。Of course, if the deformation of the diaphragm 4 is small and only a slight strain occurs in the metal thin film 10, it is not necessary to provide the slit in the metal thin film 10.
なお、スリットがないダイヤフラムを使用し変形大なる
とき金属薄膜に亀裂が生じてもアキュムレータの作動上
何ら問題はない。Note that even if a diaphragm without slits is used and the metal thin film cracks when deformed to a large extent, there is no problem in the operation of the accumulator.
（作用）
気体室２には、気体４人口５から、あらかじめ所定の圧
力（例えば１０〜２０気圧）となるように気体（例えば
空気、窒素）が封入されており、液体室３にはオイルポ
ンプ（図示せず）から液体導入口６を通って、作動圧力
油が供給されて貯蔵される。液体導入口６は、油圧機械
や油圧車高調整装置などの油圧装置（図示せず）にも連
通しており、その途中に設けられたバルブ（図示せず）
を開くことにより、液体室３内の作動圧力油が油圧装置
に送られてそれを作動させる。(Function) The gas chamber 2 is filled with gas (e.g., air, nitrogen) from 4 gases 5 to a predetermined pressure (e.g., 10 to 20 atmospheres), and the liquid chamber 3 is filled with an oil pump. Working pressure oil is supplied from (not shown) through a liquid inlet 6 and stored. The liquid inlet 6 also communicates with a hydraulic device (not shown) such as a hydraulic machine or a hydraulic vehicle height adjustment device, and a valve (not shown) provided in the middle thereof.
By opening, the operating pressure oil in the liquid chamber 3 is sent to the hydraulic system to operate it.
液体室３内にオイルポンプから作動圧力油が供給されな
いときは、気体室２内の気体圧力によって、ダイヤフラ
ム４は下方へ拡張している。液体室３内に作動圧力油が
供給されると、気体室２内の気体圧力に打勝って、液体
室３内に作動圧力油が貯蔵される。次いで、油圧装置側
の途中のパルプを開くと、液体室３内の作動圧力油が油
圧装置に送られて、油圧装置を作動させる。この際、気
体室２からダイヤフラムを透過して液体室３内の作動圧
力油に溶解する気体の量は、気体圧力、温度、ダイヤプ
ラム面積に比例し、ダイヤフラムの厚さに反比例する。When operating pressure oil is not supplied from the oil pump into the liquid chamber 3, the diaphragm 4 expands downward due to the gas pressure within the gas chamber 2. When the working pressure oil is supplied into the liquid chamber 3, it overcomes the gas pressure in the gas chamber 2 and is stored in the liquid chamber 3. Next, when the pulp on the side of the hydraulic system is opened, the working pressure oil in the liquid chamber 3 is sent to the hydraulic system to operate the hydraulic system. At this time, the amount of gas that passes through the diaphragm from the gas chamber 2 and dissolves in the working pressure oil in the liquid chamber 3 is proportional to the gas pressure, temperature, and diaphragm area, and inversely proportional to the thickness of the diaphragm.
しかるに、本発明のダイヤフラム４では弾性体９に金属
薄膜１０が複合されているので、気体室２からの気体が
、ダイヤフラム４を透過するのが阻止され、気体室２内
の圧力降下が防止される。その結果、気体室２内への気
体再封入の頻度を低減させることができる。更に、比較
的屈曲疲労強度の高い金属薄膜１０を弾性体９に複合さ
せているので、ダイヤフラム４の拡縮変形が小さい場合
は、長期間使用しても屈曲疲労により破損するようなこ
とはなく、また、ダイヤフラム４の拡縮変形が大きい場
合は、金属薄膜１０にスリ７）１１を設けたり、あるい
は金属薄膜１０を波状に形成したりして、金属薄膜１０
にかかる変形応力を吸収することにより、金属薄膜１０
の破損を防止し、耐久性を向上させることができる。However, in the diaphragm 4 of the present invention, the elastic body 9 is combined with the metal thin film 10, so that the gas from the gas chamber 2 is prevented from passing through the diaphragm 4, and the pressure drop within the gas chamber 2 is prevented. Ru. As a result, the frequency of gas refilling into the gas chamber 2 can be reduced. Furthermore, since the thin metal film 10 with relatively high bending fatigue strength is combined with the elastic body 9, if the expansion/contraction deformation of the diaphragm 4 is small, it will not break due to bending fatigue even after long-term use. In addition, if the expansion/contraction deformation of the diaphragm 4 is large, the metal thin film 10 may be provided with a slit 7) 11, or the metal thin film 10 may be formed in a wave shape.
By absorbing the deformation stress applied to the metal thin film 10
can prevent damage and improve durability.
（実施例）
第２図に示した形状のアルミニウム薄膜（厚さ３０μｍ
）の両面に厚さ約１１のアクリロニトリルブタジェンゴ
ム（ＮＢＲ）層を積層し、加硫接着させた複合体を、第
１図に示したアキュムレータのダイヤフラムに使用して
、自動車の油圧車高調整置に用いたところ、アキュムレ
ータの空気室における圧力降下はほとんど認められず、
またダイヤフラムの破損もなく、少なくとも３年間にわ
たって連続使用することができる。(Example) Aluminum thin film of the shape shown in Fig. 2 (thickness: 30 μm)
) is laminated with approximately 11 layers of acrylonitrile butadiene rubber (NBR) on both sides and vulcanized and bonded. This composite is used for the diaphragm of the accumulator shown in Figure 1 to adjust the hydraulic vehicle height of an automobile. When used in the air chamber of the accumulator, almost no pressure drop was observed in the air chamber of the accumulator.
Further, the diaphragm is not damaged and can be used continuously for at least three years.
一方、比較のために、金属薄膜を使用しないダイヤフラ
ムを用いたアキュムレータについてテストした結果では
、約４ケ月でアキュムレータの空気室の圧力降下による
システムとしての機能が低下し、そのため空気室へ気体
を供給して、空気室の圧力を所定圧まで高めてやる必要
が生じた。On the other hand, for comparison, we tested an accumulator using a diaphragm that does not use a metal thin film, and found that after about 4 months, the accumulator's function as a system deteriorated due to a pressure drop in the air chamber, and as a result, gas was not supplied to the air chamber. Therefore, it became necessary to increase the pressure in the air chamber to a predetermined pressure.
（発明の効果）
本発明によれば、ダイヤフラムの気体透過性が低いため
に、アキュムレータの空気室の圧力低下が少なく、空気
への気体再封入頻度を低減させることができると共に、
ダイヤフラムの耐久性を向上させることができる。(Effects of the Invention) According to the present invention, since the gas permeability of the diaphragm is low, the pressure drop in the air chamber of the accumulator is small, and the frequency of refilling the air with gas can be reduced.
The durability of the diaphragm can be improved.
第１図は、本発明のダイヤフラムを用いたアキュムレー
タの一例を示す一部縦断面図、第２図は、本発明のダイ
ヤフラムに用いる金属薄膜の一例を示す斜視図、第３図
及び第４図は、本発明のダイヤフラムに用いる金属薄膜
の例を示す平面図、第５図は、本発明のダイヤフラムの
一例を示す縦断面図である。
ｌ・・・・・・アキュムレータ本体、
２・・・・・・空気室、
３・・・・・・液体室、
４・・・・・・ダイヤフラム、
９・・・・・・弾性体、
１０・・・・・・金属薄膜、
１１・・・・・・スリット。FIG. 1 is a partial vertical sectional view showing an example of an accumulator using the diaphragm of the present invention, FIG. 2 is a perspective view showing an example of a metal thin film used in the diaphragm of the present invention, and FIGS. 3 and 4 5 is a plan view showing an example of a metal thin film used in the diaphragm of the present invention, and FIG. 5 is a longitudinal cross-sectional view showing an example of the diaphragm of the present invention. l...Accumulator body, 2...Air chamber, 3...Liquid chamber, 4...Diaphragm, 9...Elastic body, 10 ...Metal thin film, 11...Slit.
Claims (4)
イヤフラムにおいて、該ダイヤフラムが弾性部材と金属
薄膜との複合体で形成されていることを特徴とするアキ
ュムレータ用ダイヤフラム。(1) A diaphragm for an accumulator, the diaphragm separating a liquid chamber and a gas chamber of the accumulator, the diaphragm being formed of a composite of an elastic member and a metal thin film.
範囲第１項記載のアキュムレータ用ダイヤフラム。(2) A diaphragm for an accumulator according to claim 1, wherein a slit is formed in the metal thin film.
ものである特許請求の範囲第１項又は第２項記載のアキ
ュムレータ用ダイヤフラム。(3) The diaphragm for an accumulator according to claim 1 or 2, wherein the composite body is a thin metal film with elastic members laminated on both sides.
囲第１項、第２項又は第３項記載のアキュムレータ用ダ
イヤフラム。(4) A diaphragm for an accumulator according to claim 1, 2, or 3, wherein the metal thin film is formed in a wave shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62034942A JPS63203901A (en) | 1987-02-17 | 1987-02-17 | Diaphragm for accumulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62034942A JPS63203901A (en) | 1987-02-17 | 1987-02-17 | Diaphragm for accumulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63203901A true JPS63203901A (en) | 1988-08-23 |
Family
ID=12428226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62034942A Pending JPS63203901A (en) | 1987-02-17 | 1987-02-17 | Diaphragm for accumulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63203901A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0274602U (en) * | 1988-11-25 | 1990-06-07 | ||
| JPH0490761U (en) * | 1990-12-25 | 1992-08-07 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63190902A (en) * | 1987-02-02 | 1988-08-08 | Nok Corp | Bladder for accumulator and manufacture thereof |
-
1987
- 1987-02-17 JP JP62034942A patent/JPS63203901A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63190902A (en) * | 1987-02-02 | 1988-08-08 | Nok Corp | Bladder for accumulator and manufacture thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0274602U (en) * | 1988-11-25 | 1990-06-07 | ||
| JPH0490761U (en) * | 1990-12-25 | 1992-08-07 |
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