WO2014184972A1 - 密封装置 - Google Patents
密封装置 Download PDFInfo
- Publication number
- WO2014184972A1 WO2014184972A1 PCT/JP2013/079185 JP2013079185W WO2014184972A1 WO 2014184972 A1 WO2014184972 A1 WO 2014184972A1 JP 2013079185 W JP2013079185 W JP 2013079185W WO 2014184972 A1 WO2014184972 A1 WO 2014184972A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- screw
- lip
- lip edge
- dust
- sealing device
- 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.)
- Ceased
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3244—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with hydrodynamic pumping action
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
Definitions
- the present invention is a sealing device that seals the outer periphery of a rotating body with a seal lip in an automobile, a general machine, an industrial machine, etc., and in particular, a screw ridge for obtaining a seal by a screw pump action is formed on the seal lip.
- a sealing device that seals the outer periphery of a rotating body with a seal lip in an automobile, a general machine, an industrial machine, etc., and in particular, a screw ridge for obtaining a seal by a screw pump action is formed on the seal lip.
- FIG. 5 shows an example of a conventional sealing device in which a screw ridge is formed on the seal lip to obtain a sealing property by a screw pump action.
- the sealing device 100 includes a seal lip 110 integrally formed of a rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity) on a metal reinforcing ring 120.
- a rubber-like elastic material rubber material or synthetic resin material having rubber-like elasticity
- An anti-sealing space-side conical surface 113 having a large diameter toward the surface is formed, and the anti-sealing space-side conical surface 113 is formed with a number of screw protrusions 114 extending at a predetermined inclination angle with respect to the circumferential direction.
- Each screw ridge 114 has a boat bottom shape that gradually changes so that the height and width become maximum in the middle portion in the longitudinal direction, and the tip extends to the lip edge 111.
- a garter spring 130 for compensating the tight force is attached to the outer peripheral portion of the seal lip 110.
- the entire circumference of the lip edge 111 in the seal lip 110 is slidably in contact with the outer peripheral surface of the rotary shaft 200, so that the oil to be sealed in the sealed space A is separated from the shaft circumference to the external space (reverse). Sealed space) Prevents leakage to the B side.
- the screw ridges 114, 114,... cause the screw pump action as the rotary shaft 200 rotates in the R direction, that is, the oil to be sealed that tries to leak the shaft circumference to the external space B side. Since it exerts the action of pushing back to the sealed space A side, it exhibits excellent sealing performance (see, for example, the following prior art documents).
- the screw ridge 114 passes through the outer peripheral surface of the rotary shaft 200 and the sliding portion of the lip edge 111 from the sealed space A to the target oil to be leaked. While acting to push back to the sealed space A side, the dust that has entered the seal inner circumferential space C from the outer space B side is applied to the threaded ridge 114 by the centrifugal force caused by the accompanying air in the R direction as the rotating shaft 200 rotates. It collides and has the effect
- the present invention has been made in view of the above points, and the technical problem thereof is dust that has entered from the outside in a sealing device in which a screw ridge is formed on the conical surface on the anti-sealing space side of the seal lip. Is to prevent biting into the sliding portion of the lip edge.
- a sealing device includes a seal lip extending toward the sealed space side, and an inner peripheral surface of the seal lip is provided with a rotating body.
- a lip edge slidably in contact with the outer peripheral surface and an anti-sealing space side conical surface having a large diameter from the lip edge toward the outer space side are formed, and the rotating body is formed on the anti-sealing space side conical surface. That a plurality of screw ridges that produce a screw pump action toward the lip edge side are formed by rotating in a certain direction, and that a required number of dust trapping portions are formed at the skirt of each screw ridge. It is a feature.
- the sealing device according to the first aspect, wherein the screw protrusion extends from the lip edge and has a substantially uniform height and width, and the first screw protrusion.
- the boat bottom-shaped second threaded ridge that extends from the end opposite to the lip edge and gradually changes so that the width and the height of the bulge from the conical surface on the anti-sealing space become the largest in the middle in the longitudinal direction.
- the dust trapping portion is formed at a predetermined interval along the skirt portion of the second screw protrusion.
- a sealing device is characterized in that, in the configuration of the first or second aspect, the dust trapping portion is formed of a notch or a recess.
- the dust that collides with the screw ridge and moves to the lip edge side due to the accompanying air accompanying the rotation of the rotation shaft is transferred to the dust capturing portion formed at the skirt of the screw ridge. Since it is captured, it is possible to effectively prevent a decrease in sealing performance due to dust being bitten by the sliding portion of the lip edge.
- the screw ridge is composed of a first screw ridge on the lip edge side and a boat-shaped second screw ridge on the lip edge side
- dust is generated at the bottom of the second screw ridge.
- FIG. 1 is a half sectional view showing a first embodiment of a sealing device according to the present invention.
- FIG. 2 is a partial development view of an inner peripheral surface of a seal lip in FIG. 1. It is a half sectional view which shows 2nd embodiment of the sealing device which concerns on this invention.
- FIG. 4 is a partial development view of an inner peripheral surface of a seal lip in FIG. 3. It is a half sectional view which shows an example of the sealing device by a prior art.
- FIG. 1 and FIG. 2 show a first embodiment.
- the sealing device includes a seal lip 2 formed of a rubber-like elastic material (rubber material or a synthetic resin material having rubber-like elasticity), a daub on a metal reinforcing ring 1.
- the strip 3 and the outer peripheral seal portion 4 are integrally formed.
- a garter spring 5 is mounted on the outer peripheral surface near the tip of the seal lip 2.
- the reinforcing ring 1 is manufactured by punching and stamping a steel plate or the like, and extends from the outer diameter cylindrical portion 11 and the end of the outer diameter cylindrical portion 11 in the mounted state to the inner diameter side from the end on the anti-sealing space side. It consists of an inward ridge 12.
- the seal lip 2 extends from the inner diameter end of the inward flange portion 12 of the reinforcing ring 1 in a direction toward the sealed space A in the mounted state, and slides on the inner periphery near the tip with the outer peripheral surface 200a of the rotary shaft 200.
- An anti-sealed space side conical surface 23 having a large diameter is formed.
- the rotating shaft 200 corresponds to the rotating body described in claim 1.
- a large number of threaded ridges 24, 24,... Whose tip ends at the lip edge 21 are formed at a predetermined pitch in the circumferential direction on the anti-sealing space side conical surface 23 of the seal lip 2.
- the screw ridges 24, 24,... Extend at a predetermined inclination angle ⁇ in the rotation direction (R direction) of the rotation shaft.
- R direction rotation direction
- a screw pump action is generated in which the fluid that is dragged and rotated together with the outer peripheral surface 200a of the rotating shaft 200 is sent to the lip edge 21 side.
- Each screw protrusion 24 has a mountain-shaped cross section orthogonal to the extending direction thereof, and extends from the lip edge 21 and has a substantially uniform height and width, and the first screw protrusion 241. Extending from the end of the strip 241 opposite the lip edge 21, the width and the height of the bulge from the anti-sealed space side conical surface 23 are gradually changed so that the height is the largest in the middle in the longitudinal direction. It consists of a double screw ridge 242. Further, the second screw ridge 242 is a bulge in which the ridge portion 242a curved in a keel shape on the bottom of the boat is in non-contact with the outer peripheral surface 200a of the rotating shaft 200 at least in an initial state where no wear has occurred. It is formed at a height.
- a plurality of dust-capturing notches 243 are formed at predetermined intervals in the length direction of the skirts (ridges) 242b and 242b on both sides in the width direction of the boat bottom-shaped second screw protrusion 242. These dust trapping notches 243 correspond to the dust trapping portion described in claim 1 and are formed in a substantially V shape.
- the dust lip 3 extends in a conical cylindrical shape from the position on the inner peripheral side of the inward flange portion 12 of the reinforcing ring 1 to the side opposite to the seal lip 2 (the direction toward the external space B in the mounted state).
- the tip 3a of the inner peripheral space C of the inner seal is not exposed to a negative pressure by the screw pump function of the screw protrusion 24 of the seal lip 2 with a slight gap G with respect to the outer peripheral surface 200a of the rotary shaft 200.
- the outer peripheral seal portion 4 is formed by a rubber-like elastic material continuous with the seal lip 2 and the dust lip 3 wrapping around the outer peripheral side of the outer diameter cylindrical portion 11 of the reinforcing ring 1.
- the peripheral surface is tightly fitted and fixed in a state of being appropriately compressed in the radial direction.
- the garter spring 5 is formed by connecting metal coil springs in an annular shape, and is fitted into an annular groove 25 formed on the outer peripheral surface of the seal lip 2 near the tip.
- the sealing device having the above configuration is press-fitted to the inner peripheral surface of the housing (not shown) so that the seal lip 2 faces the sealed space A, and the lip edge portion 21 of the seal lip 2
- the oil to be sealed in the sealed space A is prevented from leaking from the shaft periphery to the external space B side by being slidably in close contact with the outer peripheral surface 200a.
- the tip 3a of the dust lip 3 is not in contact with the outer peripheral surface 200a of the rotating shaft 200 through a slight gap G. Therefore, in the environment where the external space B is dusty, a part of the external dust Enters the seal inner circumferential space C between the dust lip 3 and the seal lip 2 through the gap G. However, in the seal inner circumferential space C, air is accompanied in the R direction with the rotation of the rotary shaft 200. Therefore, as shown by a broken line arrow in FIG. In the process of flowing in the R direction along with the air in the outer periphery, the second screw ridge 242 is hit by the centrifugal force and moved to the lip edge 21 side along the skirt 242b. Captured at 243. For this reason, the penetration and accumulation of the dust d on the first screw protrusion 241 side is prevented, and further, the deterioration of the sealing performance due to the dust d being bitten by the sliding portion of the lip edge 21 is effectively prevented. .
- FIG 3 and 4 show a second embodiment of the sealing device according to the present invention.
- a portion different from the first embodiment described above is a dust trapping portion according to claim 1, wherein the bottom portion of the boat bottom-shaped second screw ridge 242 on both sides in the width direction (the ridge portion).
- a plurality of dust catching recesses 244 are formed at predetermined intervals in the length direction of 242b and 242b.
- the dust catching concave portion 244 is formed so as to cut out the skirt portion (ridge portion) 242b and to go around the conical surface 23 on the anti-sealing space side.
- the rotating shaft Since air is rotated in the R direction accompanying the rotation of 200, as shown by a broken line arrow in FIG. 4, the dust d causes the outer peripheral portion of the seal inner peripheral space C to move along with the air by centrifugal force. In the process of flowing in the direction, it collides with the boat bottom-shaped second screw ridge 242 and moves to the lip edge 21 side along the skirt 242b, and is captured by the dust capturing recess 244 in the moving process. For this reason, the penetration and accumulation of the dust d on the first screw protrusion 241 side is prevented, and further, the deterioration of the sealing performance due to the dust d being bitten by the sliding portion of the lip edge 21 is effectively prevented. .
- the tip 3a of the dust lip 3 is described as being in non-contact with the outer peripheral surface 200a of the rotating shaft 200.
- the dust lip Even when 3 is in close contact with the outer peripheral surface 200a of the rotary shaft 200 with a tight margin, in an environment with much dust, intrusion of dust into the seal inner circumferential space C occurs due to eccentricity or winding by sliding rotation. Therefore, even in such a case, the present invention can provide an excellent effect.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Abstract
Description
21 リップエッジ
23 反密封空間側円錐面
24 ねじ突条
241 第一ねじ突条
242 第二ねじ突条
243 ダスト捕捉用切欠(ダスト捕捉部)
244 ダスト捕捉用凹部(ダスト捕捉部)
3 ダストリップ
200 回転軸
A 密封空間
B 外部空間
C シール内周空間
Claims (3)
- 密封空間側を向いて延びるシールリップを備え、このシールリップの内周面に、回転体の外周面と摺動可能に密接されるリップエッジと、このリップエッジから外部空間側へ向けて大径になる反密封空間側円錐面が形成され、前記反密封空間側円錐面に、前記回転体が一定方向へ回転することによって前記リップエッジ側へ向けてねじポンプ作用を生じる複数のねじ突条が形成され、各ねじ突条の裾部に、所要数のダスト捕捉部が形成されたことを特徴とする密封装置。
- ねじ突条がリップエッジから延びて高さ及び幅が略均一の第一ねじ突条と、この第一ねじ突条におけるリップエッジと反対側の端部から延びて、幅及び反密封空間側円錐面からの隆起高さが長さ方向中間部で最も大きくなるように漸次変化する舟底形の第二ねじ突条からなり、ダスト捕捉部が、前記第二ねじ突条の裾部に沿って所定間隔で形成されたことを特徴とする請求項1に記載の密封装置。
- ダスト捕捉部が、切欠又は凹部からなることを特徴とする請求項1又は2に記載の密封装置。
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020157032412A KR20160008547A (ko) | 2013-05-14 | 2013-10-29 | 밀봉장치 |
| US14/890,289 US9822882B2 (en) | 2013-05-14 | 2013-10-29 | Sealing device |
| CN201380076590.XA CN105229348B (zh) | 2013-05-14 | 2013-10-29 | 密封装置 |
| EP13884928.6A EP2998620B1 (en) | 2013-05-14 | 2013-10-29 | Sealing device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013101975A JP6177582B2 (ja) | 2013-05-14 | 2013-05-14 | 密封装置 |
| JP2013-101975 | 2013-05-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2014184972A1 true WO2014184972A1 (ja) | 2014-11-20 |
Family
ID=51897973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2013/079185 Ceased WO2014184972A1 (ja) | 2013-05-14 | 2013-10-29 | 密封装置 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US9822882B2 (ja) |
| EP (1) | EP2998620B1 (ja) |
| JP (1) | JP6177582B2 (ja) |
| KR (1) | KR20160008547A (ja) |
| CN (1) | CN105229348B (ja) |
| WO (1) | WO2014184972A1 (ja) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3260743B1 (en) | 2015-03-31 | 2021-05-12 | NOK Corporation | Sealing apparatus |
| WO2017122539A1 (ja) * | 2016-01-13 | 2017-07-20 | Nok株式会社 | 密封装置 |
| GB2550172A (en) * | 2016-05-11 | 2017-11-15 | Delphi Int Operations Luxembourg Sarl | Seal |
| DE102016122889A1 (de) * | 2016-11-28 | 2018-05-30 | Endress+Hauser Conducta Gmbh+Co. Kg | Formdichtung und Armatur mit einer solchen |
| CN106391717A (zh) * | 2016-11-30 | 2017-02-15 | 北京市城南橡塑技术研究所 | 轧机支承辊用橡胶防护水封 |
| IT201600128919A1 (it) * | 2016-12-20 | 2018-06-20 | Bosch Gmbh Robert | Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna |
| GB2560331A (en) * | 2017-03-07 | 2018-09-12 | Delphi Int Operations Luxembourg Sarl | Oil seal |
| JP2020041553A (ja) * | 2018-09-06 | 2020-03-19 | Nok株式会社 | 密封装置 |
| WO2020162350A1 (ja) * | 2019-02-04 | 2020-08-13 | イーグル工業株式会社 | 摺動部品 |
| JP7644771B2 (ja) * | 2020-09-15 | 2025-03-12 | Nok株式会社 | 密封装置 |
| DE102022131876A1 (de) * | 2022-12-01 | 2024-06-06 | BRUSS Sealing Systems GmbH | Radialwellendichtring |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0329768U (ja) * | 1989-07-31 | 1991-03-25 | ||
| US6036193A (en) * | 1995-05-25 | 2000-03-14 | Nok Corporation | Oil seals and method of making thereof |
| JP2001027326A (ja) * | 1999-07-14 | 2001-01-30 | Keeper Co Ltd | オイルシール |
| JP3278349B2 (ja) | 1995-05-25 | 2002-04-30 | エヌオーケー株式会社 | 密封装置 |
| JP2006125454A (ja) * | 2004-10-27 | 2006-05-18 | Nok Corp | オイルシール |
| JP2013061022A (ja) * | 2011-09-14 | 2013-04-04 | Nok Corp | オイルシール |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD107968A1 (ja) * | 1972-05-23 | 1974-08-20 | ||
| US4118856A (en) * | 1974-12-02 | 1978-10-10 | Garlock Inc | Bi-directional hydrodynamic shaft seal method |
| US4183543A (en) * | 1978-11-13 | 1980-01-15 | Dana Corporation | Hydrodynamic seal with collector bead |
| JP2582922B2 (ja) | 1990-03-27 | 1997-02-19 | シャープ株式会社 | 記録再生装置 |
| GB9103217D0 (en) * | 1991-02-15 | 1991-04-03 | Crane John Uk Ltd | Mechanical face seals |
| US5441283A (en) * | 1993-08-03 | 1995-08-15 | John Crane Inc. | Non-contacting mechanical face seal |
| JPH07208611A (ja) * | 1994-01-26 | 1995-08-11 | Koyo Seiko Co Ltd | オイルシ−ル |
| EP0939257A3 (en) * | 1998-02-27 | 2000-05-31 | NOK Corporation | Oil seal |
| CN2460801Y (zh) * | 2001-01-18 | 2001-11-21 | 王玉明 | 可双向旋转的螺旋槽端面密封装置 |
| US6729624B1 (en) * | 2001-02-20 | 2004-05-04 | Freudenberg-Nok General Partnership | Radial shaft seal |
| JP2003056718A (ja) * | 2001-08-22 | 2003-02-26 | Koyo Seiko Co Ltd | オイルシール |
| JP4670210B2 (ja) * | 2001-09-14 | 2011-04-13 | Nok株式会社 | 密封装置 |
| JP4366897B2 (ja) * | 2002-02-28 | 2009-11-18 | Nok株式会社 | 成形型の加工方法 |
| JP2005172061A (ja) * | 2003-12-09 | 2005-06-30 | Nok Corp | 密封装置 |
| EP1895208B1 (en) * | 2005-06-21 | 2012-07-04 | NOK Corporation | Oil seal and process for producing the same |
| EP2189689B1 (en) * | 2007-09-04 | 2014-11-12 | Arai Seisakusho Co., Ltd | Hermetic sealing device |
| US7931277B2 (en) * | 2009-08-27 | 2011-04-26 | Stein Seal Company | Hydrodynamic circumferential seal system for large translations |
| JP6267475B2 (ja) * | 2013-10-04 | 2018-01-24 | Nok株式会社 | 密封装置 |
| US10228059B2 (en) * | 2013-10-10 | 2019-03-12 | Nok Corporation | Sealing device |
-
2013
- 2013-05-14 JP JP2013101975A patent/JP6177582B2/ja not_active Expired - Fee Related
- 2013-10-29 KR KR1020157032412A patent/KR20160008547A/ko not_active Ceased
- 2013-10-29 EP EP13884928.6A patent/EP2998620B1/en not_active Not-in-force
- 2013-10-29 CN CN201380076590.XA patent/CN105229348B/zh not_active Expired - Fee Related
- 2013-10-29 WO PCT/JP2013/079185 patent/WO2014184972A1/ja not_active Ceased
- 2013-10-29 US US14/890,289 patent/US9822882B2/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0329768U (ja) * | 1989-07-31 | 1991-03-25 | ||
| US6036193A (en) * | 1995-05-25 | 2000-03-14 | Nok Corporation | Oil seals and method of making thereof |
| JP3278349B2 (ja) | 1995-05-25 | 2002-04-30 | エヌオーケー株式会社 | 密封装置 |
| JP2001027326A (ja) * | 1999-07-14 | 2001-01-30 | Keeper Co Ltd | オイルシール |
| JP2006125454A (ja) * | 2004-10-27 | 2006-05-18 | Nok Corp | オイルシール |
| JP2013061022A (ja) * | 2011-09-14 | 2013-04-04 | Nok Corp | オイルシール |
Also Published As
| Publication number | Publication date |
|---|---|
| US9822882B2 (en) | 2017-11-21 |
| CN105229348A (zh) | 2016-01-06 |
| EP2998620B1 (en) | 2018-12-12 |
| KR20160008547A (ko) | 2016-01-22 |
| EP2998620A1 (en) | 2016-03-23 |
| CN105229348B (zh) | 2017-05-10 |
| US20160116067A1 (en) | 2016-04-28 |
| JP2014222092A (ja) | 2014-11-27 |
| EP2998620A4 (en) | 2016-05-04 |
| JP6177582B2 (ja) | 2017-08-09 |
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