JPH0643868B2 - Diaphragm - Google Patents
DiaphragmInfo
- Publication number
- JPH0643868B2 JPH0643868B2 JP60267993A JP26799385A JPH0643868B2 JP H0643868 B2 JPH0643868 B2 JP H0643868B2 JP 60267993 A JP60267993 A JP 60267993A JP 26799385 A JP26799385 A JP 26799385A JP H0643868 B2 JPH0643868 B2 JP H0643868B2
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- diaphragm
- insert
- blasting
- valve
- 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.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14311—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles using means for bonding the coating to the articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C2045/1486—Details, accessories and auxiliary operations
- B29C2045/14868—Pretreatment of the insert, e.g. etching, cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/755—Membranes, diaphragms
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Diaphragms And Bellows (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本願発明は、合成樹脂製のインサート部をゴム部で埋設
して成形されたゴム製のダイアフラムに関する。特に、
自動車の内燃機関における排ガス再循環装置の調圧弁等
として使用されるダイアフラム弁のように、高温下でし
かもゴム部がオイルミストと接触するような苛酷な使用
条件下におかれるものに好適なダイアフラムに関する。
ここでは、上記ダイアフラム弁に適用されるダイアフラ
ムを例に採り説明するがこれに限られるものではない。Description: TECHNICAL FIELD The present invention relates to a rubber diaphragm formed by embedding a synthetic resin insert portion in a rubber portion. In particular,
A diaphragm suitable for use under severe operating conditions such as a diaphragm valve used as a pressure regulating valve for an exhaust gas recirculation device in an internal combustion engine of an automobile under high temperature and where a rubber portion comes into contact with oil mist. Regarding
Here, the diaphragm applied to the diaphragm valve will be described as an example, but the diaphragm is not limited thereto.
＜従来の技術＞ 従来、上記ダイアフラムは、第１図に示すように、ゴム
部１とインサート部５とからなり、そしてゴム部１は、
中央に弁座部２を、外周の屈曲部３を備えており、さら
にインサート部５はばね座部６を備えた構成であつた。
このとき、弁座部２は耐摩耗性・剛性，屈曲部３は耐屈
曲性・柔軟性とそれぞれ異なる特性を要求される。この
ため、これらに対応して弁座部２をフツ素ゴム，屈曲部
３をシリコーンゴムで二色成形したものが出回つてい
る。なお、この二色成形は面倒であり、材料の融合不良
も生じるおそれがあるため、弁座部２と屈曲部３を同一
材料（例えばＣＲ，ＮＢＲ等）で形成し、弁座部表面に
フツ素ゴム層を形成したものが提案されている（実開昭
５２−５０１５９号公報参）。また、インサート部５
は、硬質の合成樹脂製である。<Prior Art> Conventionally, the diaphragm is composed of a rubber portion 1 and an insert portion 5 as shown in FIG. 1, and the rubber portion 1 is
The valve seat portion 2 was provided in the center, the bent portion 3 on the outer periphery was provided, and the insert portion 5 was provided with the spring seat portion 6.
At this time, the valve seat portion 2 is required to have different wear resistance and rigidity, and the bending portion 3 is required to have different characteristics such as bending resistance and flexibility. For this reason, two-color molding of the valve seat portion 2 made of fluororubber and the bent portion 3 made of silicone rubber are commercially available. Since this two-color molding is troublesome and there is a possibility that defective fusion of materials may occur, the valve seat portion 2 and the bent portion 3 are made of the same material (for example, CR, NBR, etc.), and the foot seat surface is formed with a foot. A base rubber layer is proposed (see Japanese Utility Model Laid-Open No. 52-50159). Also, the insert part 5
Is made of hard synthetic resin.
＜発明が解決しようとする問題点＞ しかし、上記いずれの構成のダイアフラムにおいても、
弁として使用した場合、耐久性において十分とは言いが
たかつた。即ち、オイル浸漬後の耐久試験を行なつた場
合、ゴム部が膨潤して、インサート部５と剥離してしま
い、ゴム部にも破れが発生して、メインテナンスフリー
の要請には答えがたかつた。<Problems to be Solved by the Invention> However, in any of the above-described diaphragms,
When used as a valve, the durability was not sufficient. That is, when the durability test after immersion in oil was performed, the rubber part swelled and separated from the insert part 5, and the rubber part also broke, and the maintenance-free request was answered. It was
＜問題点を解決するための手段＞ 本願発明者らは、上記問題点を解決すべく、鋭意開発に
努力した結果、インサート部表面がブラスト処理されて
いる場合、ダイアフラムの耐久性が格段に向上すること
を見い出し下記構成のダイアフラムに想到した。<Means for Solving Problems> The inventors of the present invention have made intensive efforts to solve the above problems, and as a result, when the insert surface is blasted, the durability of the diaphragm is significantly improved. He found what he could do and came up with a diaphragm with the following structure.
合成樹脂製のインサート部をゴム部で埋設して成形され
たゴム製のダイアフラムにおいて、インサート部のゴム
部との接合面がブラスト処理されているとともに、該ブ
ラスト処理によりインサート部のゴム部で被覆される部
位のエッジが除去されていることを特徴とする。In a rubber diaphragm molded by embedding a synthetic resin insert part in a rubber part, the joint surface of the insert part with the rubber part is blasted, and the rubber part of the insert part is covered by the blasting process. The edge of the part to be removed is removed.
＜作用＞ 本願発明におけるダイアフラムの耐久性の大幅な向上の
理由は、必ずしも明らかではないが、下記の如くである
と推定される。<Operation> The reason for the drastic improvement in the durability of the diaphragm in the present invention is not necessarily clear, but is presumed to be as follows.
インサート部表面がブラスト処理されていることによ
り、インサート部表面に付着している離型剤が除去され
るとともに、粗面化により母体（ゴム部）とのインサー
ト部との接着性が向上し、かつ、インサート部のエツジ
（特に第２図Ｅ１、Ｅ２、Ｅ３）が除去されて、該部か
らのゴム部における亀裂の発生がなくなる。By blasting the surface of the insert part, the release agent adhering to the surface of the insert part is removed, and the roughening of the surface improves the adhesiveness between the base part (rubber part) and the insert part. At the same time, the edges of the insert portion (particularly E1, E2, and E3 in FIG. 2) are removed, and the occurrence of cracks in the rubber portion from the portion is eliminated.
＜実施例＞ 以下、本発明を、実施例に基づいて詳細に説明をする。<Examples> Hereinafter, the present invention will be described in detail based on Examples.
合成樹脂製のインサート部５は、射出成形等により成形
され、インサート部５のゴム部１との接合面がブラスト
処理されているとともに、該ブラスト処理によりインサ
ート部５のゴム部１で被覆される部位のエッジＥ１、Ｅ
２、Ｅ３が除去されている。インサート部５の合成樹脂
材料としては、特に限定されないが、前述の如く高温下
でかつオイルミストにさらされるダイアフラム弁の部品
として使用する場合は、耐熱性，耐オイル性に優れたポ
リフエニレンスルフイド（ＰＰＳ），ポリブチレンテレ
フタレート（ＰＢＴ）等を用いることが望ましい。The insert part 5 made of synthetic resin is molded by injection molding or the like, the joint surface of the insert part 5 with the rubber part 1 is blasted, and is covered with the rubber part 1 of the insert part 5 by the blasting process. Edges of parts E1, E
2, E3 has been removed. The synthetic resin material of the insert portion 5 is not particularly limited, but when it is used as a component of a diaphragm valve that is exposed to oil mist at high temperature as described above, it is a polyphenylene sulphate excellent in heat resistance and oil resistance. Id (PPS), polybutylene terephthalate (PBT) or the like is preferably used.
ブラスト処理の方法は、グリツトブラスト，シヨツトブ
ラスト、サンドブラスト等いずれでもよいが、摩耗程度
が少ないグリツトブラストが望ましく、ブラスト処理後
の表面粗さは、Rmax２０〜４０μｍとする。なおブラス
ト処理前のインサート部５の表面粗さは、通常Rmax４〜
６μｍである。上記ブラスト処理後の表面粗さがRmax２
０μｍ未満では、本願発明の効果を奏せず、Rmax４０μ
ｍを超えても、本願発明の効果は増大せず、かえつて、
リブ部等の強度低下を招き望ましくない。なお、インサ
ート部５表面のブラスト処理は、ゴム埋設部のみであつ
てもよい。The blasting method may be any of grit blasting, shot blasting, sand blasting and the like, but grit blasting with a small degree of wear is desirable, and the surface roughness after blasting is R max 20 to 40 μm. The surface roughness of the insert part 5 before blasting is usually R max 4 to
It is 6 μm. The surface roughness after the blast treatment is R max 2
If it is less than 0 μm, the effect of the present invention is not exhibited and R max is 40 μm.
Even if it exceeds m, the effect of the present invention does not increase.
This is not desirable because it causes a decrease in the strength of the ribs and the like. Note that the surface of the insert portion 5 may be blasted only at the rubber-embedded portion.
上記の如くブラスト処理されたインサート部５を金型に
保持して、弁座部２と屈曲部３を別材料で二色成形又
は、同一材料で成形する。二色成形するときは、コンプ
レツシヨンとトランスフアーを組合せて、同一材料で成
形するときはトランスフアー又は射出等により成形す
る。図例では、ゴム材料流れ及び、ゴム部とインサート
部との結合力を確実にするために、インサート部の外周
部に等間叫隔で結合孔５ａが形成されているが必然的で
はない。ゴム寺材料は前述の通りである。The insert portion 5 blasted as described above is held in the mold, and the valve seat portion 2 and the bent portion 3 are two-color molded with different materials or molded with the same material. In the case of two-color molding, a complexion and a transfer are combined, and in the case of molding with the same material, they are molded by transfer or injection. In the illustrated example, in order to ensure the flow of the rubber material and the connecting force between the rubber portion and the insert portion, the connecting holes 5a are formed at equal intervals in the outer peripheral portion of the insert portion, but this is not inevitable. The rubber temple material is as described above.
こうして形成されたダイアフラムは、第３図に示すよう
に、弁箱体上部１１と弁箱体下部１２とに挾着されて使
用される。このとき、インサート部５のばね座部６と弁
箱体上部１１の天井部との間にはコイルばね１４が介さ
れている。The diaphragm thus formed is used by being sandwiched between the valve box upper part 11 and the valve box lower part 12, as shown in FIG. At this time, the coil spring 14 is interposed between the spring seat portion 6 of the insert portion 5 and the ceiling portion of the valve box upper portion 11.
＜発明の効果＞ 本発明のダイアフラムは、上記の如く、合成樹脂製のイ
ンサート部表面がブラスト処理されてインサート成形さ
れている構成により、ダイアフラムの耐久性が格段に向
上する。<Effect of the Invention> As described above, the diaphragm of the present invention has a structure in which the surface of the insert portion made of synthetic resin is blast-treated and insert-molded, whereby the durability of the diaphragm is remarkably improved.
ちなみに、ブラスト処理（媒体；スチールグリツト、径
0.1〜0.3mm）・未処理の各インサート部（表面粗さ：前
者≒Rmax３０μｍ、後者≒Rmax５μｍ）を用いて、第１
図に示す構成のダイアフラムを二色成形し、各ダイアフ
ラムについて、オイル中に７２時間浸漬した後、下記条
件で耐久性試験を行なつたところ、前者（本発明）は作
動回数、往復７０万回で異常がみられなかつたのに対
し、後者（従来）は作動回数、往復１０万回でゴム部に
亀裂が発生した。なお、インサート部の材料はＰＰＳ，
ゴム部における弁座部及び屈曲部の各材料は、フツ素ゴ
ム及びシリコーンゴムとした。By the way, blast treatment (medium; steel grits, diameter
0.1-0.3 mm) ・ Using each untreated insert part (surface roughness: former ≈ R max 30 μm, latter ≈ R max 5 μm)
The diaphragm having the configuration shown in the figure was molded in two colors, and each diaphragm was immersed in oil for 72 hours and then subjected to a durability test under the following conditions. The former (invention) showed the number of operations, 700,000 reciprocations. No abnormality was observed in the above, whereas in the latter (conventional), the rubber part cracked after 100,000 reciprocations. The material of the insert is PPS,
The materials of the valve seat portion and the bent portion of the rubber portion were fluorine rubber and silicone rubber.
耐久試験条件； 雰囲気温度…１２０℃、 静圧…±５００mmHg 作動ストローク…±５mmDurability test conditions; Atmospheric temperature… 120 ℃, Static pressure… ± 500mmHg Working stroke… ± 5mm
第１図は本発明を適用可能なダイアフラムの一例を示す
断面図，第２図は第１図のダイアフラムにおけるインサ
ート部の拡大断面図，第３図は第１図のダイアフラムを
弁箱体に組み付けた状態を示すハツチ部分省略端面図で
ある。 １……ゴム部、 ２……弁座部、 ３……屈曲部、 ５……インサート部、 ６……ばね座部。FIG. 1 is a sectional view showing an example of a diaphragm to which the present invention is applicable, FIG. 2 is an enlarged sectional view of an insert portion of the diaphragm of FIG. 1, and FIG. 3 is an assembly of the diaphragm of FIG. It is an end view which abbreviate | omitted the hatched part which shows the opened state. 1 ... rubber part, 2 ... valve seat part, 3 ... bent part, 5 ... insert part, 6 ... spring seat part.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小林 裕之 愛知県西春日井郡春日村大字落合字長畑１ 番地 豊田合成株式会社内 (56)参考文献 特開 昭51−126279（ＪＰ，Ａ) 実公 昭43−4304（ＪＰ，Ｙ１) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroyuki Kobayashi Hiroyuki Kobayashi No. 1 Nagahata, Ochiai, Kasuga-mura, Nishikasugai-gun, Aichi Prefecture (56) References JP-A-51-126279 (JP, A) 43-4304 (JP, Y1)
Claims (1)
して成形されたゴム製のダイアフラムにおいて、 前記インサート部の前記ゴム部との接合面がブラスト処
理されているとともに、 該ブラスト処理により前記インサート部の前記ゴム部で
被覆される部位のエッジが除去されていることを特徴と
するダイアフラム。1. A rubber diaphragm molded by embedding a synthetic resin insert portion in a rubber portion, wherein a joint surface of the insert portion with the rubber portion is blasted and the blasting treatment is performed. A diaphragm, wherein an edge of a portion of the insert portion covered with the rubber portion is removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60267993A JPH0643868B2 (en) | 1985-11-28 | 1985-11-28 | Diaphragm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60267993A JPH0643868B2 (en) | 1985-11-28 | 1985-11-28 | Diaphragm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62127571A JPS62127571A (en) | 1987-06-09 |
| JPH0643868B2 true JPH0643868B2 (en) | 1994-06-08 |
Family
ID=17452418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60267993A Expired - Lifetime JPH0643868B2 (en) | 1985-11-28 | 1985-11-28 | Diaphragm |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0643868B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005010667A1 (en) * | 2005-03-08 | 2006-09-14 | Nitrochemie Aschau Gmbh | Hardener, useful as a sealing, adhesive or coating material, comprises propane-2-one-O,O'-(methoxymethylsilanediyl)dioxime and propane-2-one-O,O',O''-(methylsilanetriyl)trioxime or propane-2-one-O-(dimethoxymethylsilyl)oxime |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0272271A (en) * | 1988-09-05 | 1990-03-12 | Fujikura Rubber Ltd | Diaphragm |
| JP2657928B2 (en) * | 1988-09-05 | 1997-09-30 | 藤倉ゴム工業株式会社 | Diaphragm |
| JP2726014B2 (en) * | 1995-01-06 | 1998-03-11 | 株式会社ワイ・テイ・エス | Diaphragm assembly and method of manufacturing the same |
| GB0706240D0 (en) | 2007-03-30 | 2007-05-09 | Concept 2 Manufacture Design O | A valve means for gas control devices |
| WO2012167427A1 (en) * | 2011-06-08 | 2012-12-13 | Tang Hongzhi | Bistable pulse electromagnetic valve |
| WO2019111297A1 (en) * | 2017-12-04 | 2019-06-13 | 藤倉ゴム工業株式会社 | Composite molded article, and method for manufacturing same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51126279A (en) * | 1975-04-25 | 1976-11-04 | Mitsubishi Chem Ind Ltd | Anti-slipping treatment of synthetic resin shaped articles |
-
1985
- 1985-11-28 JP JP60267993A patent/JPH0643868B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005010667A1 (en) * | 2005-03-08 | 2006-09-14 | Nitrochemie Aschau Gmbh | Hardener, useful as a sealing, adhesive or coating material, comprises propane-2-one-O,O'-(methoxymethylsilanediyl)dioxime and propane-2-one-O,O',O''-(methylsilanetriyl)trioxime or propane-2-one-O-(dimethoxymethylsilyl)oxime |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62127571A (en) | 1987-06-09 |
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