JP2732112B2 - Bellows and mold equipment for bellows production - Google Patents
Bellows and mold equipment for bellows productionInfo
- Publication number
- JP2732112B2 JP2732112B2 JP1042568A JP4256889A JP2732112B2 JP 2732112 B2 JP2732112 B2 JP 2732112B2 JP 1042568 A JP1042568 A JP 1042568A JP 4256889 A JP4256889 A JP 4256889A JP 2732112 B2 JP2732112 B2 JP 2732112B2
- Authority
- JP
- Japan
- Prior art keywords
- bellows
- mounting portion
- cylindrical mounting
- annular
- cylindrical
- 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 - Fee Related
Links
- 238000004519 manufacturing process Methods 0.000 title description 6
- 230000002093 peripheral effect Effects 0.000 claims description 34
- 238000000071 blow moulding Methods 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 230000000994 depressogenic effect Effects 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
-
- 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
- B29L2031/703—Bellows
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Diaphragms And Bellows (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、自動車の緩衝装置であるサスペンションの
保護ブーツ、ラックアンドピニオン式ステアリング装置
の保護ブーツ、駆動部の等速ジョイントブーツ等のベロ
ーズ、およびそのベローズ製造用の金型装置に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a bellows such as a protective boot for a suspension which is a shock absorber of an automobile, a protective boot for a rack and pinion type steering device, a constant velocity joint boot for a driving unit, and the like. And a mold apparatus for manufacturing the bellows.
［従来の技術］ 従来、この種のベローズにおいては、例えば、実開昭
60−167259号公報に記載されているように、筒状蛇腹部
の両端部に短い円筒状開口端部が形成されており、この
短い円筒状開口端部の内周面には、ベローズの装着部に
対して完全な密嵌合状態を保持させるための環状突出部
が形成されていた。[Prior art] Conventionally, in this type of bellows, for example,
As described in Japanese Patent Application Laid-Open No. 60-167259, a short cylindrical opening end is formed at both ends of the cylindrical bellows, and a bellows is mounted on the inner peripheral surface of the short cylindrical opening end. An annular protruding portion for maintaining a completely tight fitting state with the portion was formed.
［発明が解決しようとする課題］ 上記のように構成されていた従来のベローズにあって
は、短い円筒状開口部、すなわち筒状取付部の内周面に
環状の突出部が形成されているので、ベローズの装着時
にその内周面の環状突出部が短い円筒状開口部の挿し込
みの妨げとなって、作業性が非常に悪いのが欠点であっ
た。そこで、作業性を良好にするには、環状突出部の突
出高さを低くすればよいが、それではベローズの取付部
のシール性が低下して、機能性が損なわれてしまう。[Problems to be Solved by the Invention] In the conventional bellows configured as described above, a short cylindrical opening, that is, an annular protrusion is formed on the inner peripheral surface of the cylindrical mounting portion. Therefore, when the bellows is mounted, the annular projection on the inner peripheral surface of the bellows hinders insertion of the short cylindrical opening, and the workability is very poor. In order to improve the workability, the height of the projecting portion of the annular projection may be reduced. However, the sealing performance of the mounting portion of the bellows is reduced, and the functionality is impaired.
ところで、上記のようなベローズの筒状取付部の内周
面に環状の突出部を形成することは、その環状突出部の
突出高さ如何によってシール性に差異があるとしても、
シール性の向上に有効であることはいうまでもない。By the way, forming an annular projection on the inner peripheral surface of the cylindrical mounting portion of the bellows as described above, even if there is a difference in sealing performance depending on the projection height of the annular projection,
Needless to say, it is effective for improving the sealing property.
しかしながら、ベローズの筒状取付部の内周面に環状
突出部を形成することができるのは、ベローズをその内
外面ともに金型によって形状規制する成形法によって成
形する場合に限られ、ベローズの外面形状に対応したキ
ャビティを有する金型間に筒状のパリソンを挟み、圧力
流体の導入によりパリソンの外面を金型のキャビティに
沿わせた形状にブロー成形することによって製造するベ
ローズにあっては、筒状取付部の内周面が基本的に平滑
面（フラット）なるところとから、筒状取付部の内周面
に環状の突出部を形成することができないので、従来か
ら、ブロー成形により製造されるベローズにおいては、
いかにしてシール性を向上させるかが技術上の課題であ
ったのである。However, the annular projection can be formed on the inner peripheral surface of the cylindrical mounting portion of the bellows only when the inner and outer surfaces of the bellows are formed by a molding method in which the shape is regulated by a mold. In a bellows manufactured by sandwiching a cylindrical parison between molds having a cavity corresponding to the shape and blow molding the outer surface of the parison into a shape along the cavity of the mold by introducing a pressure fluid, Since the inner peripheral surface of the cylindrical mounting portion is basically a smooth surface (flat), an annular protrusion cannot be formed on the inner peripheral surface of the cylindrical mounting portion. In bellows,
How to improve the sealing performance was a technical issue.
本発明は、このような従来から技術上の課題に鑑み、
ベローズの外面形状に対応したキャビティを有する金型
間に筒状のパリソンを挟み、圧力流体の導入によりパリ
ソンの外面を金型のキャビティに沿わせた形状にブロー
成形するベローズであっても、筒状取付部に高いシール
性が得られ、しかもその装着部に容易に挿し込むことが
できて作業性の良好なベローズおよびそれを製造するた
めの金型装置を提供することを目的とするものである。The present invention has been made in view of such conventional technical problems,
Even if a bellows is formed by sandwiching a cylindrical parison between molds having a cavity corresponding to the outer shape of the bellows and blow molding the outer surface of the parison along the mold cavity by introducing a pressure fluid, It is an object of the present invention to provide a bellows which has a high sealing property in a shape mounting portion, can be easily inserted into the mounting portion, and has good workability, and a mold device for manufacturing the same. is there.
［課題を解決するための手段］ 本発明は、上記目的を達成するための技術的手段とし
て、次のとおり構成した。[Means for Solving the Problems] The present invention has the following technical means for achieving the above object.
すなわち、その構成に係るベローズは、ベローズの外
面形状に対応したキャビティを有する金型間に筒状のパ
リソンを挟み、圧力流体の導入によりパリソンの外面を
金型のキャビティに沿わせた形状にブロー成形してなる
筒状蛇腹部の両端部に筒状取付部を有するベローズにお
いて、少なくとも一方の端部の筒状取付部の外周面に平
ベルトを締め付ける凹陥部を形成するとともに、筒状取
付部の凹陥部内には、筒状取付部の肉厚と略同等の幅で
外方に突出する環状突起を形成し、ブロー成形により平
滑面に成形される筒状取付部の内周面には、上記環状突
起の幅内の幅方向略中間部に対応する部位に環状突起が
ブロー成形されることにより生じた環状切込部を有する
ことを特徴とするものであり、そのベローズを製造する
金型装置は、筒状取付部の外周面に平ベルトを締め付け
る凹陥部を形成するとともに、筒状取付部の凹陥部内に
は筒状取付部の肉厚と略同等の幅で外方に突出する環状
突起を形成し、筒状取付部の内周面には、上記環状突起
の幅内の幅方向略中間部に対応する部位に環状切込部を
有してなる請求項１記載のベローズをブロー成形するた
めの金型装置であって、一対の分割金型からなり、一対
の分割金型の内面のキャビティに、筒状取付部の外周面
に凹陥部を形成する環状突部を設け、この環状突部にさ
らに環状突起を形成する環状凹溝を設けてなることを特
徴とするものである。That is, the bellows according to the configuration has a configuration in which a cylindrical parison is sandwiched between molds having a cavity corresponding to the outer shape of the bellows, and the outer surface of the parison is blown into a shape along the mold cavity by introducing a pressure fluid. In a bellows having cylindrical mounting portions at both ends of a formed cylindrical bellows portion, a concave portion for fastening a flat belt is formed on the outer peripheral surface of the cylindrical mounting portion at at least one end, and the cylindrical mounting portion is formed. In the recessed part, an annular projection that projects outward with a width substantially equal to the thickness of the cylindrical mounting part is formed, and on the inner peripheral surface of the cylindrical mounting part formed into a smooth surface by blow molding, The annular projection has an annular cut portion formed by blow molding the annular projection at a position corresponding to a substantially middle portion in the width direction of the annular projection, and a mold for manufacturing the bellows. The device is cylindrical A concave portion for tightening the flat belt is formed on the outer peripheral surface of the portion, and an annular protrusion is formed in the concave portion of the cylindrical mounting portion so as to protrude outward with a width substantially equal to the thickness of the cylindrical mounting portion. 2. A mold for blow-molding a bellows according to claim 1, wherein the inner peripheral surface of the ring-shaped mounting portion has an annular notch at a position corresponding to a substantially middle portion in the width direction of the annular projection. An apparatus, comprising a pair of split molds, wherein a cavity on the inner surface of the pair of split molds is provided with an annular protrusion that forms a recess on the outer peripheral surface of the cylindrical mounting portion, and the annular protrusion further has an annular shape. It is characterized in that an annular concave groove for forming a projection is provided.
［作用］ 本発明に係るベローズにおいては、その筒状取付部の
凹陥部内に筒状取付部の肉厚と略同等の幅で外方に突出
する環状突起が形成され、ブロー成形により平滑面に成
形される筒状取付部の内周面には、上記環状突起の幅内
の幅方向略中間部に対応する部位に環状突起がブロー成
形されるその幅内の幅方向略中間部に対応する部位に環
状切込部を有するが、この環状切込部は常態において略
閉塞しているので、筒状取付部の内周面には突出部が全
く無いうえ略平滑面をなしている。そして、その内周面
に環状切込部が全周にわたって形成されているところか
ら、筒状取付部をベローズの装着部に対する挿し込み時
には環状切込部が開いて筒状取付部が拡径状に容易に変
形し、ベローズ装着部に対する挿し込みが円滑にでき
る。[Operation] In the bellows according to the present invention, an annular projection is formed in the recessed portion of the cylindrical mounting portion so as to protrude outward with a width substantially equal to the thickness of the cylindrical mounting portion. On the inner peripheral surface of the cylindrical mounting portion to be molded, the annular projection is blow molded at a position corresponding to a substantially intermediate portion in the width direction within the width of the annular projection. Although there is an annular cut portion in the portion, this annular cut portion is substantially closed in a normal state, so that the inner peripheral surface of the cylindrical mounting portion has no projection and has a substantially smooth surface. When the cylindrical mounting portion is inserted into the mounting portion of the bellows, the annular cutting portion is opened and the cylindrical mounting portion has an enlarged diameter because the annular notching portion is formed on the entire inner peripheral surface thereof. , And can be easily inserted into the bellows mounting portion.
次いで、挿し込み後に筒状取付部の凹陥部内に平ベル
トを巻き込み、かつ締め付けると、筒状取付部の略全面
が均等に締め付けられるとともに、環状突起が内周面の
環状切込部側に突出する方向に押し出されて、環状突起
の部分がいわゆるＯリング状になり、筒状取付部のベロ
ーズ装着部に対する高いシール性が保持される。Next, after the insertion, the flat belt is wound into the concave portion of the cylindrical mounting portion and tightened, so that substantially the entire surface of the cylindrical mounting portion is evenly tightened, and the annular protrusion projects toward the annular cut portion side of the inner peripheral surface. And the annular projection is formed into a so-called O-ring shape, and a high sealing property of the cylindrical mounting portion to the bellows mounting portion is maintained.
一方、本発明に係るベローズを製造するための金型装
置においては、一対の分割金型の内面のキャビティに、
筒状取付部の外周面に凹陥部を形成する環状突部が設け
られ、この環状突部にはさらに環状突起を形成する環状
凹溝が設けられているので、ベローズのブロー成形時
に、その筒状取付部の外周面には環状突部で凹陥部が、
かつ環状凹溝で環状突起が形成されるとともに、筒状取
付部の内周面の上記環状凹溝に対応する部位は窪んで環
状切込部となる。On the other hand, in the mold apparatus for manufacturing the bellows according to the present invention, the cavity on the inner surface of the pair of split molds,
An annular protrusion that forms a concave portion is provided on the outer peripheral surface of the cylindrical mounting portion, and an annular concave groove that further forms an annular protrusion is provided in the annular protrusion. A concave portion with an annular protrusion on the outer peripheral surface of the
An annular projection is formed by the annular groove, and a portion corresponding to the annular groove on the inner peripheral surface of the cylindrical mounting portion is depressed to be an annular cut portion.
［実 施 例］ 本発明の実施例を図面について説明する。[Embodiment] An embodiment of the present invention will be described with reference to the drawings.
第１図および第２図において、１は等速ジョイントブ
ーツとしてのベローズであって、このベローズ１は、ベ
ローズ１の外面形状に対応したキャビティを有する金型
間に筒状のパリソンを挟み、圧力流体の導入によりパリ
ソンの外面を金型のキャビティに沿わせた形状にブロー
成形してなり、筒状蛇腹部２の両端部に筒状取付部３を
有するものである。1 and 2, reference numeral 1 denotes a bellows as a constant velocity joint boot. The bellows 1 has a cylindrical parison sandwiched between a mold having a cavity corresponding to the outer surface shape of the bellows 1, and has a pressure. The parison is blow-molded into a shape in which the outer surface of the parison is aligned with the cavity of the mold by the introduction of a fluid, and has a cylindrical mounting portion 3 at both ends of the cylindrical bellows portion 2.
筒状取付部３には、その外周面に、後述する平ベルト
を締め付ける凹陥部４が形成されており、かつ凹陥部４
内には環状突起５が形成されている。また、基本的に平
滑面をなす筒状取付部３の内周面には、上記ブロー成形
される環状突起５に対応してその幅ｗ内の幅方向略中間
部に窪みが生じてこれが環状切込部６となる。この環状
切込部６は常態において略閉塞している。なお、筒状蛇
腹部２の両端部の筒状取付部３は、その一方が大径であ
り、他方が小径となっている。On the outer peripheral surface of the cylindrical mounting portion 3, a concave portion 4 for fastening a flat belt described later is formed.
An annular projection 5 is formed therein. In addition, the inner peripheral surface of the cylindrical mounting portion 3, which basically forms a smooth surface, has a recess at a substantially middle portion in the width direction within the width w corresponding to the annular protrusion 5 to be blow-molded. The notch 6 is formed. This annular cut portion 6 is substantially closed in a normal state. One of the cylindrical mounting portions 3 at both ends of the cylindrical bellows portion 2 has a large diameter, and the other has a small diameter.
以下に、図示の実施例について具体的数値例を示す。 Below, specific numerical examples are shown for the illustrated embodiment.
筒状取付部（大径側） 直径48mm 同 （小径側） 直径12mm 凹陥部の幅（Ｗ） 9.5mm 同 深さ（Ｄ） 2.5mm 環状突起の幅（ｗ） 1.5mm 同高さ（ｄ） 1,0mm 環状切込部の最大深さ（ｈ） 1.5mm 本発明者の実験によれば、環状突起５の形状によって
シール性に変化があることが分かった。すなわち、環状
突起５の幅ｗが１〜2mmの範囲で、しかも高さｄが0.75
〜1.5mmのものがベローズが要求するシール強度と装着
作業性を兼ね備えている。なお、凹陥部４の幅Ｗと深さ
Ｄは、平ベルトが収まる程度のものであれば特に考慮す
る必要はない。ここで筒状取付部３肉厚は、0.5〜2.5mm
であればよく、好ましくは１〜2mmであり、図示の実施
例では1mmである。Tubular mounting part (large diameter side) Diameter 48mm Same (small diameter side) Diameter 12mm Depressed part width (W) 9.5mm Same depth (D) 2.5mm Annular protrusion width (w) 1.5mm Same height (d) 1,0 mm Maximum depth (h) of the annular cut portion 1.5 mm According to the experiment of the present inventor, it was found that the shape of the annular projection 5 changed the sealing property. That is, the width w of the annular projection 5 is in the range of 1 to 2 mm, and the height d is 0.75.
The one with a diameter of 1.5 mm has both the seal strength required by the bellows and the mounting workability. The width W and the depth D of the recess 4 need not be considered as long as the flat belt can be accommodated. Here, the thickness of the cylindrical mounting part 3 is 0.5 to 2.5 mm
And preferably 1 to 2 mm, and 1 mm in the illustrated embodiment.
前記ベローズ１は、ポリオレフィン系、ポリエステル
系、ポリウレタン系、ポリアミド系、スチレン系等の各
種エラストマーやゴム弾性に富んだ軟質ポリ塩化ビニル
などの熱可塑性合成樹脂や天然ゴムや合成ゴムの単体材
料からなる単層体やこれらを適度に組み合わせた多層体
あるいはこれらを複数種ブレンドした組成物からなる単
層体あるいは多層体から構成されている。The bellows 1 is made of a single material of a thermoplastic synthetic resin such as a polyolefin-based, polyester-based, polyurethane-based, polyamide-based, or styrene-based elastomer or a rubber-rich soft polyvinyl chloride or a natural rubber or a synthetic rubber. It is composed of a single layer, a multilayer obtained by appropriately combining them, or a single layer or a multilayer formed of a composition obtained by blending a plurality of these.
特に、本発明は、圧縮永久歪（JIS K6301）が75％以
下、好ましくは72％以下のゴム弾性に富んだ構成材料を
使用することによりシール強度および装着作業性に飛躍
的効果があることが分かった。In particular, the present invention has a remarkable effect on seal strength and mounting workability by using a rubber-rich constituent material having a compression set (JIS K6301) of 75% or less, preferably 72% or less. Do you get it.
なお、上記実施例では、筒状蛇腹部２の両端の筒状取
付部２の凹陥部４、環状突起５および環状切込部６を形
成したが、本発明はこれらに限定されるものではなく、
被装着部材の形状に応じて少なくとも一方端の筒状取付
部３に形成することにより、効果を発揮するものであ
る。In the above embodiment, the concave portion 4, the annular protrusion 5, and the annular cut portion 6 of the tubular mounting portion 2 at both ends of the tubular bellows portion 2 are formed, but the present invention is not limited to these. ,
The effect is exhibited by forming at least one end of the cylindrical mounting portion 3 according to the shape of the mounted member.
第３図および第４図には、等速ジョイント７に、前記
ベローズ１を装着する態様が示されている。FIG. 3 and FIG. 4 show a mode in which the bellows 1 is mounted on the constant velocity joint 7.
すなわち、８は等速ジョイント７のブーツ装着部（大
径側）であり、ベローズ１はその筒状取付部３を挿し込
んで装着される。そして、筒状取付部３の内周面には突
出部が全く無いうえ略平滑面をなしており、しかも、環
状切込部６が容易に開くので、ブーツ装着部８の外周面
に沿って円滑に挿し込むことができる。次に筒状取付部
３の凹陥部４に平ベルト９を巻き付け、かつ締め付けれ
ば、筒状取付部３の全面が均等に締め付けられるととも
に、環状突起５が内周面方向に圧縮され、内周面側の環
状切込部６に押し出されるので、平ベルト９による均等
な締め付け作用と、環状突起５が環状切込部６に押し出
されることによる、いわゆるＯリンク効果によるシール
作用が両々相俟って高いシール性が保持される。したが
って、ベローズ１内の密封性が完全である。That is, reference numeral 8 denotes a boot mounting portion (large diameter side) of the constant velocity joint 7, and the bellows 1 is mounted by inserting the tubular mounting portion 3 thereof. The inner peripheral surface of the cylindrical mounting portion 3 has no projecting portion and has a substantially smooth surface. Further, since the annular cut portion 6 is easily opened, along the outer peripheral surface of the boot mounting portion 8. It can be inserted smoothly. Next, when the flat belt 9 is wound around the concave portion 4 of the cylindrical mounting portion 3 and tightened, the entire surface of the cylindrical mounting portion 3 is uniformly tightened, and the annular protrusion 5 is compressed in the inner circumferential surface direction. Since it is pushed out into the annular notch 6 on the peripheral surface side, both the uniform tightening action by the flat belt 9 and the sealing action by the so-called O-link effect by pushing out the annular protrusion 5 into the annular notch 6 are combined. Thus, a high sealing property is maintained. Therefore, the hermeticity inside the bellows 1 is perfect.
第５図には、上記ベローズ１をブロー成形により製造
するための金型装置10が例示されている。FIG. 5 illustrates a mold apparatus 10 for manufacturing the bellows 1 by blow molding.
この金型装置10は、一対の分割金型11,11からなるも
のであり、一対の分割金型11,11の内面キャビティに
は、大径側の筒状取付部３を形成する部位に、筒状取付
部３の外周面に凹陥部４を形成する環状突部12が設けら
れており、この環状突部12にはさらに環状突起５を形成
する環状凹溝13が設けられている。なお、小径側の筒状
取付部３を形成する部位も同構成であるので、その説明
は省略する。The mold apparatus 10 includes a pair of split molds 11, 11. In the inner cavities of the pair of split molds 11, 11, a portion where the large-diameter-side cylindrical mounting portion 3 is formed is provided. An annular projection 12 forming the concave portion 4 is provided on the outer peripheral surface of the cylindrical mounting portion 3, and the annular projection 12 is further provided with an annular concave groove 13 forming the annular projection 5. In addition, since the part forming the cylindrical attachment part 3 on the small diameter side has the same configuration, the description thereof is omitted.
上記金型装置10によるベローズ１のブロー成形態様
は、第６図に示されている。この図に示すように、ブロ
ー成形されるベローズ１には、筒状取付部３が形成さ
れ、環状突部12によって筒状取付部３の外周面に凹陥部
４が形成されるとともに、凹陥部４内には、環状凹溝13
によって環状突起５が形成される。そして、ブロー成形
により基本的に平滑面となる筒状取付部３の内周面側に
は、環状凹溝13に対応する部位が内側に窪み、環状切込
部６が形成される。なお、鎖線ａは成形後の切除線を示
しており、14は膨出バリ部である。The blow molding of the bellows 1 by the mold apparatus 10 is shown in FIG. As shown in this figure, the bellows 1 to be blow-molded has a cylindrical mounting portion 3 formed therein, an annular projection 12 forms a concave portion 4 on the outer peripheral surface of the cylindrical mounting portion 3, and a concave portion. 4 has an annular groove 13
Thereby, an annular protrusion 5 is formed. A portion corresponding to the annular groove 13 is depressed inward on the inner peripheral surface side of the cylindrical mounting portion 3 which becomes a basically smooth surface by blow molding, and an annular cut portion 6 is formed. A chain line a indicates a cut line after molding, and reference numeral 14 indicates a bulging burr portion.
［発明の効果］ 本発明によれば、ベローズの外面形状に対応したキャ
ビティを有する金型間に筒状のパリソンを挟み、圧力流
体の導入によりパリソンの外面を金型のキャビティに沿
わせた形状にブロー成形するベローズであって、筒状取
付部の内面が基本的に平滑面となるものであっても、筒
状取付部の外周面側を平ベルトで締め付けると、環状突
起が内周面の環状切込部側に突出する方向に押し出され
て、環状突起の部分がいわゆるＯリング状になり、筒状
取付部のベローズ装着部に対する高いシール性を保持す
ることができるとともに、そのベローズを容易に製造す
ることができる効果が得られる。[Effects of the Invention] According to the present invention, a cylindrical parison is sandwiched between molds having a cavity corresponding to the outer surface shape of the bellows, and the outer surface of the parison is made to follow the cavity of the mold by introducing a pressure fluid. Even if the inner surface of the cylindrical mounting portion is basically a smooth surface, the annular projection is formed on the inner peripheral surface by tightening the outer peripheral surface side of the cylindrical mounting portion with a flat belt. Is pushed out in the direction protruding toward the annular notch, so that the annular projection has a so-called O-ring shape, so that the cylindrical mounting portion can maintain high sealing performance with respect to the bellows mounting portion, and the bellows can be removed. An effect that can be easily manufactured is obtained.
【図面の簡単な説明】 第１図は本発明の一実施例を示すベローズの全体正面
図、第２図は同上その一部の拡大断面図、第３図および
第４図はベローズの装着過程の態様を示す一部の断面
図、第５図はベローズをブロー成形により製造するため
の金型装置を構成する一対の分割金型の断面図、第６図
は同上ベローズのブロー成形態様を示す一部の断面図で
ある。 １……ベローズ、２……筒状蛇腹部、３……筒状取付
部、４……凹陥部、５……環状突起、６……環状切込
部、７……等速ジョイント、８……ブーツ装着部、９…
…平ベルト、10……金型装置、11,11……一対の分割金
型、12……環状突部、13……環状凹溝BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall front view of a bellows showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a part of the bellows, and FIGS. FIG. 5 is a sectional view of a pair of split molds constituting a mold apparatus for producing a bellows by blow molding, and FIG. 6 shows a blow molding mode of the bellows. It is a partial sectional view. DESCRIPTION OF SYMBOLS 1 ... Bellows, 2 ... Cylindrical bellows part, 3 ... Cylindrical mounting part, 4 ... Depressed part, 5 ... Annular protrusion, 6 ... Annular cut part, 7 ... Constant velocity joint, 8 ... … Boot mounting part, 9…
... flat belt, 10 ... mold apparatus, 11, 11 ... a pair of split molds, 12 ... annular protrusion, 13 ... annular concave groove
Claims (2)
を有する金型間に筒状のパリソンを挟み、圧力流体の導
入によりパリソンの外面を金型のキャビティに沿わせた
形状にブロー成形してなる筒状蛇腹部の両端部に筒状取
付部を有するベローズにおいて、少なくとも一方の端部
の筒状取付部の外周面に平ベルトを締め付ける凹陥部を
形成するとともに、筒状取付部の凹陥部内には、筒状取
付部の肉厚と略同等の幅で外方に突出する環状突起を形
成し、ブロー成形により平滑面に成形される筒状取付部
の内周面には、上記環状突起の幅内の幅方向略中間部に
対応する部位に環状突起がブロー成形されることにより
生じた環状切込部を有することを特徴とするベローズ。1. A cylindrical parison is sandwiched between molds having a cavity corresponding to the outer surface shape of a bellows, and blow molding is performed by introducing a pressure fluid into a shape in which the outer surface of the parison is aligned with the cavity of the mold. In a bellows having a cylindrical mounting portion at both ends of a cylindrical bellows portion, a concave portion for fastening a flat belt is formed on an outer peripheral surface of the cylindrical mounting portion at at least one end, and a concave portion in the cylindrical mounting portion is formed. Is formed with an annular projection protruding outward with a width substantially equal to the thickness of the cylindrical mounting portion, and the inner peripheral surface of the cylindrical mounting portion formed into a smooth surface by blow molding has the above-mentioned annular projection. A bellows having an annular cut portion formed by blow molding an annular projection at a portion corresponding to a substantially middle portion in the width direction within the width.
る凹陥部を形成するとともに、筒状取付部の凹陥部内に
は筒状取付部の肉厚と略同等の幅で外方に突出する環状
突起を形成し、筒状取付部の内周面には、上記環状突起
の幅内の幅方向略中間部に対応する部位に環状切込部を
有してなる請求項１記載のベローズをブロー成形するた
めの金型装置であって、一対の分割金型からなり、一対
の分割金型の内面のキャビティに、筒状取付部の外周面
に凹陥部を形成する環状突部を設け、この環状突部にさ
らに環状突起を形成する環状凹溝を設けてなることを特
徴とするベローズ製造用金型装置。2. A concave portion for tightening a flat belt is formed on the outer peripheral surface of the cylindrical mounting portion, and the concave portion of the cylindrical mounting portion projects outward with a width substantially equal to the thickness of the cylindrical mounting portion. 2. The bellows according to claim 1, wherein an annular projection is formed, and the inner peripheral surface of the cylindrical mounting portion has an annular cut portion at a portion corresponding to a substantially middle portion in the width direction of the annular projection. A mold device for blow molding, comprising a pair of split molds, provided in a cavity on the inner surface of the pair of split molds, an annular projection forming a recess on the outer peripheral surface of the cylindrical mounting portion. A mold device for producing bellows, wherein the annular projection is further provided with an annular groove for forming an annular projection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1042568A JP2732112B2 (en) | 1989-02-22 | 1989-02-22 | Bellows and mold equipment for bellows production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1042568A JP2732112B2 (en) | 1989-02-22 | 1989-02-22 | Bellows and mold equipment for bellows production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02221767A JPH02221767A (en) | 1990-09-04 |
| JP2732112B2 true JP2732112B2 (en) | 1998-03-25 |
Family
ID=12639664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1042568A Expired - Fee Related JP2732112B2 (en) | 1989-02-22 | 1989-02-22 | Bellows and mold equipment for bellows production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2732112B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1364766B1 (en) * | 2002-04-08 | 2006-04-26 | Toyo Tire & Rubber Co., Ltd . | Method for manufacturing a joint boot made of resin |
| JP4848825B2 (en) * | 2006-04-21 | 2011-12-28 | Ｎｏｋ株式会社 | Universal joint boots |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3727871A1 (en) * | 1987-08-21 | 1989-03-02 | Loehr & Bromkamp Gmbh | Sealing sleeve |
-
1989
- 1989-02-22 JP JP1042568A patent/JP2732112B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02221767A (en) | 1990-09-04 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |