JPH0546471B2 - - Google Patents
Info
- Publication number
- JPH0546471B2 JPH0546471B2 JP60205110A JP20511085A JPH0546471B2 JP H0546471 B2 JPH0546471 B2 JP H0546471B2 JP 60205110 A JP60205110 A JP 60205110A JP 20511085 A JP20511085 A JP 20511085A JP H0546471 B2 JPH0546471 B2 JP H0546471B2
- Authority
- JP
- Japan
- Prior art keywords
- seal
- seal lip
- thread groove
- cylindrical body
- thread
- 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
- 238000005520 cutting process Methods 0.000 claims description 47
- 239000011347 resin Substances 0.000 claims description 34
- 229920005989 resin Polymers 0.000 claims description 34
- 238000007789 sealing Methods 0.000 claims description 21
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 239000012530 fluid Substances 0.000 description 17
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- YAFQFNOUYXZVPZ-UHFFFAOYSA-N liproxstatin-1 Chemical compound ClC1=CC=CC(CNC=2C3(CCNCC3)NC3=CC=CC=C3N=2)=C1 YAFQFNOUYXZVPZ-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
Landscapes
- Sealing With Elastic Sealing Lips (AREA)
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は同心に組合わされた二回転部材間を密
封するのに用いられる回転オイルシール、特にシ
ール面にねじ溝を設けたシールリツプを有するオ
イルシール及びその製造方法に関する。Detailed Description of the Invention (Industrial Application Field) The present invention relates to a rotary oil seal used for sealing between two rotating members concentrically assembled, and particularly to an oil seal having a seal lip with a threaded groove on the seal surface. This invention relates to a seal and its manufacturing method.
(従来の技術)
従来この種のオイルシールとしては、たとえば
第8図に示すようなものがある(米国特許第
3985487号明細書)。すなわち、100は板状の四フ
ツ化エチレン樹脂(以下PTFEという)によつて
成形された樹脂製のシールリツプであり、基端部
101がハウジング102内周に嵌合される支持
部材103に組付けられている。シールリツプ1
00は回転軸104に向つて傾斜して延びてお
り、その先端部が回転軸104に摺接してシール
部105が形成されている。このシールリツプ1
00の大気側側面にはリツプ先端から所定幅だけ
ねじ溝106が設けられており、回転軸104と
シールリツプ100との相対回転に伴うねじポン
プ作用によりシール部105から大気側に漏れ出
す流体を密封流体側に押し戻してシール性を向上
させていた。(Prior Art) Conventionally, there is an oil seal of this type as shown in FIG. 8 (U.S. Patent No.
3985487 specification). That is, 100 is a seal lip made of plate-shaped polytetrafluoroethylene resin (hereinafter referred to as PTFE), and the base end 101 is assembled to a support member 103 that is fitted to the inner circumference of the housing 102. It is being Seal lip 1
00 extends obliquely toward the rotating shaft 104, and its tip portion slides into contact with the rotating shaft 104 to form a seal portion 105. This seal lip 1
00 is provided with a thread groove 106 of a predetermined width from the tip of the lip on the side surface facing the atmosphere, which seals the fluid leaking from the seal portion 105 to the atmosphere side due to the screw pump action caused by the relative rotation between the rotating shaft 104 and the seal lip 100. It was pushed back to the fluid side to improve sealing performance.
(発明が解決しようとする問題点)
しかし斯かる従来例の場合には、ねじ溝106
がシールリツプ100のリツプ先端から大気側に
かけてシール面107全長にわたつて連続して設
けられ、ねじ溝106を介して密封流体側と大気
側とが連通しているので、シールリツプ100と
回転軸104との相対回転時にはねじポンプ作用
が働くものの静止時にはねじ溝106伝つて密封
流体Oが大気側に漏れるという問題があつた。(Problem to be solved by the invention) However, in the case of such a conventional example, the thread groove 106
is provided continuously over the entire length of the sealing surface 107 from the tip of the lip of the seal lip 100 to the atmosphere side, and the sealed fluid side and the atmosphere side are in communication via the thread groove 106, so that the seal lip 100 and the rotating shaft 104 are connected to each other. Although the screw pump action works when the screws rotate relative to each other, there is a problem in that when the screws are stationary, the sealing fluid O leaks to the atmosphere through the screw grooves 106.
本発明は上記従来技術の問題点を解決するため
になされたもので、その目的とするところは、ね
じポンプ機能を保持しつつ静止時の流体の漏れを
防止し得るオイルシールを提供すると共に、合わ
せてその簡易な製造方法を提供することにある。
また別の目的として、非柔軟性である樹脂製の板
状のシールリツプに回転軸等の回転部材の偏心に
対する追随性を生じさせるオイルシールおよびそ
の製造方法を提供する。 The present invention has been made to solve the problems of the prior art described above, and its purpose is to provide an oil seal that can prevent fluid leakage when stationary while maintaining the screw pump function, and Another object of the present invention is to provide a simple manufacturing method.
Another object of the present invention is to provide an oil seal and a method for manufacturing the same, which allow a non-flexible resin plate-shaped seal lip to follow the eccentricity of a rotating member such as a rotating shaft.
(問題点を解決するための手段)
上記目的を達成するために、本発明のオイルシ
ールにあつては、全長にわたつてねじ溝を備えた
樹脂製で板状のシールリツプのシール面にねじ無
し領域を設けると共に、上記ねじ溝の深さを上記
支持部材側に向つて深くしたものから成つてい
る。(Means for Solving the Problems) In order to achieve the above object, in the oil seal of the present invention, there is no thread on the sealing surface of the seal lip, which is made of resin and has a plate shape and has a thread groove over its entire length. In addition to providing a region, the depth of the thread groove is increased toward the support member side.
また本発明のオイルシールの製造方法にあつて
は、樹脂製の円筒体の端面を、該円筒体の中心軸
線と直交する軸線に対して所定角度だけ傾斜して
切断して形成したテーパ面とし、該テーパ面に、
ねじ切り手段により螺旋状のねじ溝を一部にねじ
無し領域を残して刻設するねじ切り工程と、上記
円筒体の端部を所定幅で切断して環状でテーパ面
を有するテーパ形状の板状のシールリツプを形成
する工程と、上記シールリツプのねじ溝を設けた
側をシール面として支持部材に組付ける工程とか
ら成り、上記所定角度を、ねじ切り工程によつて
刻設されるねじ溝の深さが上記支持部材側に向つ
て深くなるように設定している。 In addition, in the method for manufacturing an oil seal of the present invention, the end face of a resin cylinder is formed into a tapered surface by cutting the end face at a predetermined angle with respect to an axis perpendicular to the central axis of the cylinder. , on the tapered surface,
A thread cutting process in which a spiral thread groove is carved by a thread cutting means leaving a part of the threadless area; and a tapered plate-shaped plate having an annular tapered surface is cut by cutting the end of the cylindrical body at a predetermined width. The process consists of a step of forming a seal lip, and a step of assembling the seal lip onto a support member with the threaded side of the sealing lip as a sealing surface. The depth is set to become deeper toward the support member.
(実施例)
以下に本発明を図示の実施例に基づいて説明す
る。本発明の一実施例に係るオイルシールを示す
第1図において、1はシールリツプ2を備えた外
周金属形のオイルシールで、シールリツプ2はた
とえばPTFE等の樹脂板により成形されており、
その基端部2aがハウジング3内周に固着される
支持部材4に組付けられている。支持部材4はた
とえばハウジング3に嵌合される外筒5と外筒5
内周に嵌合される内筒6とから成り、外筒5側縁
の大気側フランジ5aと内筒6側縁の大気側フラ
ンジ6aとの間にシールリツプ2基端部2aを挟
圧して外筒5の密封流体側(図中右側)の側縁を
かしめて組付けられている。(Example) The present invention will be explained below based on the illustrated example. In FIG. 1 showing an oil seal according to an embodiment of the present invention, reference numeral 1 denotes a metal-shaped oil seal having a seal lip 2, and the seal lip 2 is made of a resin plate such as PTFE.
A base end portion 2a thereof is assembled to a support member 4 fixed to the inner periphery of the housing 3. The support member 4 includes, for example, an outer cylinder 5 and an outer cylinder 5 that are fitted into the housing 3.
The base end 2a of the seal lip 2 is pinched between an atmosphere-side flange 5a on the side edge of the outer cylinder 5 and an atmosphere-side flange 6a on the side edge of the inner cylinder 6, and the seal lip 2 is pressed outward. It is assembled by caulking the side edge of the cylinder 5 on the sealed fluid side (right side in the figure).
シールリツプ2はその基端部2aから密封流体
側に延びており、リツプ先端部がハウジング3と
相対回転する(本実施例ではハウジング3が固定
で軸7が回転する)回転軸7表面に密封接触して
シール部8を形成している。 The sealing lip 2 extends from its base end 2a toward the sealed fluid side, and the tip of the lip is in sealing contact with the surface of the rotating shaft 7, which rotates relative to the housing 3 (in this embodiment, the housing 3 is fixed and the shaft 7 rotates). A seal portion 8 is formed.
すなわちシールリツプ2の内径は回転軸7外径
よりも小になつており、回転軸7に組付けた際に
リツプ先端部2bが拡径され、リツプ先端部2b
の先端から所定幅の部分が軸表面に接触してシー
ル面10となつている。このシールリツプ2のシ
ール面10にはねじ溝9が刻設されている。ねじ
溝9のリツプ先端側の始端は、リツプ先端から所
定幅Lだけ大気側から形成され、リツプ先端から
ねじ溝9始端までの領域がねじ無し領域10aと
なつている。したがつてシール面10はねじ無し
領域10aにおいては回転軸7表面に全周にわた
つて隙間なく密着している。ねじ溝9の終端はシ
ールリツプ2のシール面10から大気側側面1
0′の基端部2a付近まで延びてそして、ねじ溝
9の深さは支持部材4側に向つて、すなわち基端
部2aの方に向つて深くなつている。 That is, the inner diameter of the seal lip 2 is smaller than the outer diameter of the rotating shaft 7, and when it is assembled to the rotating shaft 7, the lip tip 2b is expanded in diameter, and the lip tip 2b is expanded in diameter.
A portion of a predetermined width from the tip contacts the shaft surface and forms a sealing surface 10. The sealing surface 10 of the sealing lip 2 is provided with a threaded groove 9. The starting end of the thread groove 9 on the lip tip side is formed from the atmospheric side by a predetermined width L from the lip tip, and the area from the lip tip to the starting end of the thread groove 9 is a non-threaded area 10a. Therefore, the sealing surface 10 is in close contact with the surface of the rotating shaft 7 over the entire circumference in the non-threaded region 10a without any gaps. The end of the thread groove 9 extends from the sealing surface 10 of the seal lip 2 to the atmosphere-side side surface 1.
0', and the depth of the thread groove 9 becomes deeper toward the support member 4 side, that is, toward the base end portion 2a.
上記構成のオイルシールにあつては、回転軸7
とシールリツプ2との相対回転時にはシール部8
のねじ無し領域10aから大気側に漏れる流体O
はねじ無し領域10aに続くねじ溝9のねじポン
プ作用により密封流体側に押し戻されて流体の漏
れが防止される。さらに回転軸7とシールリツプ
2が相対的に静止している場合には、大気側と密
封流体側とがねじ無し領域10aにより遮断され
ているので流体の漏れが防止また、ねじ溝9の深
さが支持部材4側に向つて深くしているので、非
柔軟性の樹脂製のシールリツプ2は撓み易くなる
ため、柔軟性を持ち、回転軸7の偏心に対する追
随性を生じさせることができる。 In the case of the oil seal having the above configuration, the rotating shaft 7
When the seal lip 2 and the seal lip 2 rotate relative to each other, the seal part 8
Fluid O leaking from the unthreaded area 10a to the atmosphere side
is pushed back toward the sealed fluid side by the screw pump action of the thread groove 9 following the non-threaded region 10a, thereby preventing fluid leakage. Furthermore, when the rotating shaft 7 and the seal lip 2 are relatively stationary, the atmosphere side and the sealed fluid side are blocked by the unthreaded area 10a, preventing fluid leakage. Since the seal lip 2 is made deeper toward the support member 4, the non-flexible resin seal lip 2 is easily bent, so that it has flexibility and can follow the eccentricity of the rotating shaft 7.
上記実施例においてはねじ無し領域10aをシ
ールリツプ2先端に設けたが、シール面10のう
ちの一部がねじ無し領域となつていればよい。 In the above embodiment, the non-threaded region 10a is provided at the tip of the seal lip 2, but it is only necessary that a portion of the sealing surface 10 be the non-threaded region.
つぎに本発明のオイルシールの製造方法につい
て第2図を参照して説明する。図において11は
PTFE等の樹脂円筒体であり、施盤等にその中心
軸線を中心に回転自在に取付けられている。この
樹脂円筒体11の外周には樹脂円筒体11の端部
を板状に切り出す切削手段12と、端面に螺旋状
のねじ溝を刻設するねじ切り手段13とが配設さ
れている。切削手段12による切削は、樹脂円筒
体11の中心軸線(以下X軸という)と直交する
軸線(以下Y軸という)に対して角度αだけ傾斜
したA線方向に沿つて樹脂円筒体11の外周側か
ら半径方向内方に向つて切削するようになつてお
り、樹脂円筒体11の端面は内径側に角度αだけ
傾斜するテーパ面となつている。ねじ切り手段1
3は上記Y軸方向に沿つて樹脂円筒体11の内周
側から外周側に向つて移動するようになつてい
る。 Next, a method for manufacturing an oil seal according to the present invention will be explained with reference to FIG. In the figure, 11 is
It is a cylindrical body made of resin such as PTFE, and is attached to a lathe etc. so that it can rotate freely around its central axis. A cutting means 12 for cutting out the end of the resin cylinder 11 into a plate shape, and a thread cutting means 13 for carving a spiral thread groove on the end surface are disposed on the outer periphery of the resin cylinder 11. The cutting by the cutting means 12 cuts the outer periphery of the resin cylindrical body 11 along an A-line direction inclined at an angle α with respect to an axis (hereinafter referred to as the Y-axis) orthogonal to the central axis of the resin cylindrical body 11 (hereinafter referred to as the X-axis). Cutting is performed from the side toward the inside in the radial direction, and the end surface of the resin cylindrical body 11 is a tapered surface that is inclined at an angle α toward the inner diameter. Thread cutting means 1
3 is adapted to move from the inner circumferential side to the outer circumferential side of the resin cylindrical body 11 along the Y-axis direction.
ねじ切り手段13によるねじ切り工程にあつて
は、ねじ切り手段13先端の刃先の位置を樹脂円
筒体11の中心軸線方向の内周端縁位置と外周端
縁位置との間に位置決めして、Y軸方向に等速に
移動させる。移動させるにつれ樹脂円筒体11端
面の内周端から所定幅だけ進んだ位置でねじ切り
手段13の刃先が樹脂円筒体11端面に当接して
ねじを切り始め、樹脂円筒体11の回転とねじ切
り手段13の移動が相俟つて螺旋状に一条ねじ溝
9が刻設され、所定幅だけねじ溝9を刻設した後
ねじ切り手段13を樹脂円筒体11端面から離し
てねじ切りが終了する。この結果樹脂円筒体11
端面には内周端縁から所定幅だけねじ無し領域1
0aが自動的に形成され、それに続いて所定幅だ
けねじ溝9が形成されることになる。ねじ溝9は
角度αだけ傾斜したテーパ面となつていることか
ら第3図に示すように内径側は浅く外径側に向つ
て深く刻設される。上記ねじ無し領域10aの幅
は、上記ねじ切り手段13のX軸位置を樹脂円筒
体11端面側に近づければねじ溝9の切り始めが
早くなるので狭く、遠ざければねじ溝9の切り始
めが遅くなるので広くなり、容易に調整すること
ができる。なおねじ切り手段13を複数使用すれ
ば複数条のねじ溝9を形成することができる。 In the thread cutting process by the thread cutting means 13, the cutting edge at the tip of the thread cutting means 13 is positioned between the inner peripheral edge position and the outer peripheral edge position in the central axis direction of the resin cylindrical body 11, and move at a constant speed. As the resin cylindrical body 11 is moved, the cutting edge of the thread cutting means 13 comes into contact with the end face of the resin cylindrical body 11 at a position advanced by a predetermined width from the inner circumferential end of the resin cylindrical body 11 and starts cutting the thread, and the rotation of the resin cylindrical body 11 and the thread cutting means 13 As a result of this movement, a single thread groove 9 is carved in a spiral shape, and after cutting the thread groove 9 by a predetermined width, the thread cutting means 13 is separated from the end surface of the resin cylindrical body 11 to complete thread cutting. As a result, the resin cylindrical body 11
On the end face, there is a non-threaded area 1 by a predetermined width from the inner peripheral edge.
0a is automatically formed, and subsequently a thread groove 9 of a predetermined width is formed. Since the thread groove 9 has a tapered surface inclined by an angle α, it is carved shallowly on the inner diameter side and deeper toward the outer diameter side, as shown in FIG. The width of the non-threaded area 10a is narrower because if the X-axis position of the thread cutting means 13 is brought closer to the end surface of the resin cylindrical body 11, the cutting of the thread groove 9 will start earlier. It's slower, wider, and easier to adjust. Note that if a plurality of thread cutting means 13 are used, a plurality of thread grooves 9 can be formed.
ねじ加工した後、切削手段12により樹脂円筒
体11端部を所定の厚さで板状に切り出す。すな
わち切削手段12のX軸方向の位置を樹脂円筒体
11の端面から所定厚さ分内側に設定し、樹脂円
筒体11を回転させながらA線方向に沿つて切削
手段12を移動させ、環状のテーア面を有するテ
ーパ形状の板状のシールリツプ2を切り出す。さ
らにこのシールリツプ2をたとえば上記した第1
図に示すような支持部材4に組付ける。第1図に
示すオイルシールについて説明すると、外筒5の
密封流体側側端からシールリツプ2を嵌込み、さ
らに内筒6を嵌込んでシールリツプ2の基端部2
aを外筒5および内筒6の大気側フランジ5a,
6aにより挟圧し、外筒5の密封流体側側端縁を
半径方向内方にかしめてオイルシールの組付けが
完了する。このように、ねじ溝9が内径側は浅く
外径側に向つて深く刻設したシールリツプ2を支
持部材4に組付けることにより、ねじ溝9の深さ
は支持部材4側に向つて深くなる、したがつて、
ねじ溝9の深さを支持部材4側に向つて深くする
加工は、上記説明したように角度αだけ傾斜して
切断して形成したテーパ面に、ねじ切り手段13
によりY軸方向にのみ移動させてねじ切りを行な
うことによつて容易にできる。 After threading, the end portion of the resin cylindrical body 11 is cut into a plate shape with a predetermined thickness by the cutting means 12. That is, the position of the cutting means 12 in the X-axis direction is set inward by a predetermined thickness from the end surface of the resin cylindrical body 11, and the cutting means 12 is moved along the A-line direction while rotating the resin cylindrical body 11, thereby cutting an annular shape. A tapered plate-shaped seal lip 2 having a tapered surface is cut out. Furthermore, this seal lip 2 is
It is assembled to a support member 4 as shown in the figure. To explain the oil seal shown in FIG. 1, the seal lip 2 is fitted from the sealed fluid side end of the outer cylinder 5, and then the inner cylinder 6 is fitted to the base end 2 of the seal lip 2.
a is the atmosphere side flange 5a of the outer cylinder 5 and the inner cylinder 6,
6a, and the sealing fluid side end edge of the outer cylinder 5 is caulked radially inward to complete the assembly of the oil seal. In this way, by assembling the seal lip 2 in which the thread groove 9 is shallow on the inner diameter side and deeper toward the outer diameter side to the support member 4, the depth of the thread groove 9 becomes deeper toward the support member 4 side. , therefore,
The process of increasing the depth of the thread groove 9 toward the supporting member 4 is performed by attaching the thread cutting means 13 to the tapered surface formed by cutting the thread groove 9 at an angle α as explained above.
This can easily be done by moving only in the Y-axis direction and thread cutting.
上記実施例ではシールリツプ2の内径側から外
径側まで全幅にわたつてテーパ状に成形したが、
第4図に示すように内径側のみをテーパ形状とし
てもよい。この場合には樹脂円筒体11端面の内
径側をテーパ面に成形しておき、ねじ切り手段1
3により、上記実施例と同様の方法でねじ溝9を
刻設してねじ無し領域10aおよびねじ溝9を形
成し、ねじ溝9の深さを内径側は浅く外径側に向
つて深く刻設される。ねじ溝9を設けた後切削手
段12により板状のシールリツプ2が切り出され
るが、切削方向は傾斜をつけずに樹脂円筒体11
の中心軸線に対して直交する方向に切削する。そ
の後支持部材4にシールリツプ2を一体に組付け
る。 In the above embodiment, the seal lip 2 was formed into a tapered shape over the entire width from the inner diameter side to the outer diameter side.
As shown in FIG. 4, only the inner diameter side may be tapered. In this case, the inner diameter side of the end surface of the resin cylindrical body 11 is formed into a tapered surface, and the thread cutting means 1
3, the thread groove 9 is carved in the same manner as in the above embodiment to form the unthreaded region 10a and the thread groove 9, and the depth of the thread groove 9 is set to be shallower on the inner diameter side and deeper toward the outer diameter side. will be established. After providing the thread groove 9, the plate-shaped seal lip 2 is cut out by the cutting means 12, but the cutting direction is not inclined so that the resin cylindrical body 11
Cut in a direction perpendicular to the central axis of the Thereafter, the seal lip 2 is integrally assembled to the support member 4.
このようにして成形されたシールリツプ2を有
するオイルシールにあつては、第5図に示すよう
にリツプ先端部2bが肉薄形状となつており、薄
肉部の剛性は小さいために緊迫力は小さく摺動抵
抗が低減される。またリツプ先端部2bは回転軸
7に装着する際に延ばされるが、薄肉のために延
びやすく、回転軸7表面となじみやすくなつて良
好なシール性能が得られる。 In the oil seal having the seal lip 2 formed in this manner, the tip end portion 2b of the lip has a thin shape as shown in FIG. Dynamic resistance is reduced. Furthermore, the tip end portion 2b of the lip is elongated when attached to the rotating shaft 7, but because of its thin wall, it is easy to extend and fits easily with the surface of the rotating shaft 7, so that good sealing performance can be obtained.
上記実施例ではシールリツプ2が回転軸7に摺
接するタイプのものについて説明したが、第6図
に示すようなシールリツプ2がハウジング3内周
に摺接するタイプのオイルシールの場合には、第
7図に示すように樹脂円筒体11の端面を内径側
が外径側より突出するテーパ形状に成形してお
き、上記実施例と同様にしてねじ切り手段13を
外周側から内周側に向つてY軸方向に移動させる
ことにより、自動的にねじ無し領域10aを形成
することができ、ねじ溝9の深さを外径側は浅く
内径側に向つて深く刻設される。すなわち、支持
部材4側に向つて深くなつている。 In the above embodiment, the seal lip 2 is in sliding contact with the rotating shaft 7, but in the case of an oil seal of the type in which the seal lip 2 is in sliding contact with the inner periphery of the housing 3 as shown in FIG. As shown in the figure, the end face of the resin cylindrical body 11 is formed into a tapered shape in which the inner diameter side protrudes from the outer diameter side, and the thread cutting means 13 is cut in the Y-axis direction from the outer circumference side toward the inner circumference side in the same manner as in the above embodiment. By moving the threaded groove 9 to the inner diameter side, the threadless region 10a can be automatically formed, and the depth of the thread groove 9 is set to be shallower on the outer diameter side and deeper toward the inner diameter side. That is, it becomes deeper toward the support member 4 side.
またねじ無し領域10aの成形については、上
記実施例では樹脂円筒体11の端面をテーパ形状
にしてこの傾斜を利用して形成するようにした
が、たとえばねじ切り手段13によるねじ切り途
中においてねじ切り手段13を樹脂円筒体11端
面から一時離間させることにより形成するという
ように、ねじ切り手段13の移動を制御するよう
にしてもよい。 Regarding the shaping of the non-threaded region 10a, in the above embodiment, the end surface of the resin cylindrical body 11 is tapered and this slope is utilized to form the shape. The movement of the thread cutting means 13 may be controlled such that the thread cutting means 13 is formed by temporarily separating from the end surface of the resin cylindrical body 11.
(発明の効果)
本発明は以上の構成および作用から成るもの
で、本発明のオイルシールにあつては、ねじ溝が
設けられたシールリツプのシール面にねじ無し領
域を設けたので、ねじ無し領域は回転軸等の回転
部材に全周にわたつて隙間なく密接され、シール
リツプと回転部材とが相対的に静止している場合
の流体の漏れを防止することができると共に、相
対回転時にあつてはねじ無し領域から大気側に漏
れる流体はねじ溝のねじポンプ作用により押し戻
され良好なシール性能を確保することができると
いう効果が得られる。そして、ねじ溝の深さを支
持部材側に向つて深くしていることから、非柔軟
性の樹脂製のシールリツプは撓み易くなり柔軟性
を持つことになる。したがつて、回転部材の偏心
に対する追随性を生じさせることができる。(Effects of the Invention) The present invention has the above-described structure and operation, and in the oil seal of the present invention, a non-threaded region is provided on the sealing surface of the seal lip provided with a thread groove. The seal lip is closely fitted around the entire circumference of a rotating member such as a rotating shaft without any gaps, and can prevent fluid leakage when the seal lip and rotating member are relatively stationary, and can also prevent fluid leakage when the seal lip and rotating member are relatively stationary. Fluid leaking from the non-threaded area to the atmosphere is pushed back by the thread pump action of the thread groove, resulting in the effect that good sealing performance can be ensured. Since the depth of the thread groove is increased toward the support member, the non-flexible resin seal lip is easily bent and has flexibility. Therefore, the ability to follow the eccentricity of the rotating member can be achieved.
また本発明のオイルシールの製造方法にあつて
は、シールリツプのねじ溝およびねじ無し領域を
ねじ切り手段によつて容易に加工することがで
き、さらにねじ溝を支持部材側に向つて深く刻設
する際、樹脂製の円筒体の端面を、円筒体の中心
軸線と直交する軸線に対して支持部材側に向つて
ねじ溝が深くなるような所定角度だけ傾斜して切
断して形成したテーパ面に、ねじ切り手段により
上記軸線方向のみ移動させてねじ切りを行なうこ
とによつて容易に加工することができ、また円筒
体を切削して連続的にシールリツプを成形するこ
とができるので生産性が高く安価にオイルシール
を製造することができるという効果が得られる。 Furthermore, in the method for manufacturing an oil seal of the present invention, the threaded groove and non-threaded area of the seal lip can be easily processed by a thread cutting means, and the threaded groove can be carved deeper toward the supporting member side. At this time, the end surface of the resin cylinder is cut at a predetermined angle such that the thread groove becomes deeper toward the support member with respect to the axis perpendicular to the central axis of the cylinder. It can be easily processed by moving only in the axial direction using the thread cutting means, and the seal lip can be continuously formed by cutting the cylindrical body, resulting in high productivity and low cost. The effect of being able to manufacture oil seals is obtained.
第1図は本発明の一実施例に係るオイルシール
の要部縦断面図、第2図は本発明の一実施例に係
るオイルシールの製造方法を使用した製造装置の
概略斜視図、第3図は第2図の装置により成形さ
れたシールリツプの要部縦断面図、第4図は第2
図の装置を使用して成形されたシールリツプの他
の態様を示す要部縦断面図、第5図は第4図のシ
ールリツプを備えたオイルシールの使用状態を示
す要部縦断面図、第6図は本発明の他の実施例に
係るオイルシールの要部縦断面図、第7図は第6
図のオイルシールのシールリツプを成形する製造
装置の概略斜視図、第8図は従来のオイルシール
の要部縦断面図である。
符号の説明、1……オイルシール、2……シー
ルリツプ、4……支持部材、9……ねじ溝、10
……シール面、10a……ねじ無し領域、11…
…樹脂円筒体(円筒体)、12……切削手段、1
3……ねじ切り手段。
FIG. 1 is a vertical cross-sectional view of a main part of an oil seal according to an embodiment of the present invention, FIG. 2 is a schematic perspective view of a manufacturing apparatus using the method for manufacturing an oil seal according to an embodiment of the present invention, and FIG. The figure is a vertical sectional view of the main part of the seal lip formed by the device shown in Fig. 2, and Fig. 4 is a longitudinal sectional view of the main part of the seal lip formed by the
FIG. 5 is a vertical cross-sectional view of a main part showing another aspect of the seal lip formed using the apparatus shown in FIG. The figure is a vertical cross-sectional view of a main part of an oil seal according to another embodiment of the present invention, and FIG.
FIG. 8 is a schematic perspective view of a manufacturing apparatus for forming the seal lip of the oil seal shown in FIG. 8, and FIG. Explanation of symbols, 1...Oil seal, 2...Seal lip, 4...Support member, 9...Thread groove, 10
... Sealing surface, 10a ... Threadless area, 11...
... Resin cylindrical body (cylindrical body), 12 ... Cutting means, 1
3... Thread cutting means.
Claims (1)
脂製で板状のシールリツプを支持部材に組付けた
オイルシールにおいて、 上記シールリツプのシール面にねじ無し領域を
設けると共に、上記ねじ溝の深さを上記支持部材
側に向つて深くしたことを特徴とするオイルシー
ル。 2 樹脂製の円筒体の端面を、該円筒体の中心軸
線と直交する軸線に対して所定角度だけ傾斜して
切断して形成したテーパ面とし、該テーパ面に、
ねじ切り手段により螺旋状のねじ溝を一部にねじ
無し領域を残して刻設するねじ切り工程と、上記
円筒体の端部を所定幅で切断して環状でテーパ面
を有するテーパ形状の板状のシールリツプを形成
する工程と、上記シールリツプのねじ溝を設けた
テーパ面側をシール面として支持部材に組付ける
工程とから成り、上記所定角度を、ねじ切り工程
によつて刻設されるねじ溝の深さが上記支持部材
側に向つて深くなるように設定したオイルシール
の製造方法。[Scope of Claims] 1. An oil seal in which a plate-shaped seal lip made of resin and having a thread groove over the entire length of the seal face is assembled to a support member, wherein a non-threaded area is provided on the seal face of the seal lip, and An oil seal characterized in that the depth of the thread groove is increased toward the supporting member side. 2. A tapered surface is formed by cutting the end surface of a resin cylindrical body at a predetermined angle with respect to an axis perpendicular to the central axis of the cylindrical body, and on the tapered surface,
A thread cutting process in which a spiral thread groove is carved by a thread cutting means leaving a part of the threadless area; and a tapered plate-shaped plate having an annular tapered surface is cut by cutting the end of the cylindrical body at a predetermined width. The process consists of a process of forming a seal lip, and a process of assembling the seal lip onto a supporting member using the tapered surface side provided with a thread groove as a sealing surface. A method for manufacturing an oil seal in which the oil seal is set to become deeper toward the supporting member side.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60205110A JPS6267372A (en) | 1985-09-17 | 1985-09-17 | Oil seal and its manufacture |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60205110A JPS6267372A (en) | 1985-09-17 | 1985-09-17 | Oil seal and its manufacture |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6267372A JPS6267372A (en) | 1987-03-27 |
JPH0546471B2 true JPH0546471B2 (en) | 1993-07-14 |
Family
ID=16501586
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60205110A Granted JPS6267372A (en) | 1985-09-17 | 1985-09-17 | Oil seal and its manufacture |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6267372A (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005155694A (en) * | 2003-11-21 | 2005-06-16 | Nok Corp | Sealing device |
JP2006170269A (en) * | 2004-12-14 | 2006-06-29 | Nok Corp | Seal for powder |
JP2006266343A (en) * | 2005-03-23 | 2006-10-05 | Nok Corp | Sealing device |
US8376369B2 (en) | 2006-02-10 | 2013-02-19 | Freudenberg-Nok General Partnership | Seal with spiral grooves and contamination entrapment dams |
US8925927B2 (en) * | 2006-02-10 | 2015-01-06 | Freudenberg-Nok General Partnership | Seal with controllable pump rate |
US7494130B2 (en) * | 2006-02-13 | 2009-02-24 | Freudenberg-Nok General Partnership | Bi-directional pattern for dynamic seals |
JP4800158B2 (en) * | 2006-09-15 | 2011-10-26 | 三菱電線工業株式会社 | Rotating shaft seal |
US8919782B2 (en) | 2012-10-19 | 2014-12-30 | Freudenberg-Nok General Partnership | Dynamic lay down lip seal with bidirectional pumping feature |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57186665A (en) * | 1981-05-11 | 1982-11-17 | Akira Washida | Preparation of oil seal by die setting and oil seal |
JPS5818895A (en) * | 1981-07-24 | 1983-02-03 | 松下電器産業株式会社 | Heating cooking device |
JPS60157569A (en) * | 1983-12-19 | 1985-08-17 | シカゴ・ロ−ハイド・マニフアクチユアリング・コンパニ− | Fluid seal and manufacture thereof |
-
1985
- 1985-09-17 JP JP60205110A patent/JPS6267372A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57186665A (en) * | 1981-05-11 | 1982-11-17 | Akira Washida | Preparation of oil seal by die setting and oil seal |
JPS5818895A (en) * | 1981-07-24 | 1983-02-03 | 松下電器産業株式会社 | Heating cooking device |
JPS60157569A (en) * | 1983-12-19 | 1985-08-17 | シカゴ・ロ−ハイド・マニフアクチユアリング・コンパニ− | Fluid seal and manufacture thereof |
Also Published As
Publication number | Publication date |
---|---|
JPS6267372A (en) | 1987-03-27 |
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