EP0898057B1 - Valve stem seal - Google Patents
Valve stem seal Download PDFInfo
- Publication number
- EP0898057B1 EP0898057B1 EP98115063A EP98115063A EP0898057B1 EP 0898057 B1 EP0898057 B1 EP 0898057B1 EP 98115063 A EP98115063 A EP 98115063A EP 98115063 A EP98115063 A EP 98115063A EP 0898057 B1 EP0898057 B1 EP 0898057B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve stem
- stem seal
- retaining part
- seal according
- guide
- 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
- 238000007789 sealing Methods 0.000 claims description 20
- 229920001971 elastomer Polymers 0.000 claims description 9
- 239000000806 elastomer Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 229920003023 plastic Polymers 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 230000003068 static effect Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant
Definitions
- the invention relates to a valve stem seal, consisting of a sealing body made of elastomer with a spring for biasing the sealing lip against a surface to be sealed of the valve stem and a holding part connected to the sealing body, via which the seal is fastened to the outer surface of the valve stem guide.
- the holding part is made of the same material as the sealing body and stiffened by a sheet metal sleeve with a uniform wall thickness.
- This sheet metal sleeve engages over the holding part, which is formed in one piece with the sealing lip and is made of elastomer material over the entire seating area with the valve guide.
- the object of the present invention is to provide a valve stem seal in which the number of individual parts and / or the outlay on high-quality sealing material is reduced, but at the same time good fastening and sealing is ensured.
- the holding part has a relatively rigid section in the rear area, which serves to securely fasten the valve stem seal on the valve guide, while in the front section the taper creates space for receiving the static seal, which at the same time carries the sealing lip for sealing the valve stem. Special stiffening rings can be omitted. In the solution according to the invention, there is therefore a clear separation between the adhesive seat area and the static seal. The part forming the static seal is also considerably shorter, which means that elastomer material is saved.
- the valve stem seal shown in longitudinal section consists of a sealing body 1 made of elastomer, which has a radially inwardly directed sealing lip 2, which bears sealingly under the pretension of a spring 3 against the lateral surface 4 of the valve stem 5.
- the sealing body 1 is attached to a holding part 6 which, for. B. is made of a tough plastic.
- This holding part 6 has, in the section 8 overlapping the valve rod guide 7, a front region 9 which is tapered in the wall thickness and set back radially outwards for receiving the sealing body 1 and a rear reinforced region 10 for direct contact with the lateral surface 11 of the valve rod guide 7.
- the sealing body 1 is an annular extension 12 in the tapered area 9 of the holding part 6, for. B. by pouring or vulcanization, the bore 13 rests to form a static seal under prestress on the lateral surface 11 of the valve rod guide 7. To improve the sealing effect, the bore 13 of the annular extension 12 is provided with a wave profile 14.
- the holding part 6 is provided with a bevel 15 in the rear reinforced area 10 in the bore 13.
- the holding part 6 in this area 10 is provided with a plurality of axially extending (dashed) slots 16 distributed around the circumference, through which the holding part 6 becomes elastically resilient and can be placed under prestress on the lateral surface 11 of the valve rod guide 7.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Check Valves (AREA)
- Gasket Seals (AREA)
- Lift Valve (AREA)
Description
Die Erfindung betrifft eine Ventilschaftabdichtung, bestehend aus einem Dichtkörper aus Elastomer mit einer Feder zur Vorspannung der Dichtlippe gegen eine abzudichtende Fläche des Ventilschaftes und einem mit dem Dichtkörper verbundenen Halteteil, über den die Abdichtung auf der Mantelfläche der Ventilschaftführung befestigt ist.The invention relates to a valve stem seal, consisting of a sealing body made of elastomer with a spring for biasing the sealing lip against a surface to be sealed of the valve stem and a holding part connected to the sealing body, via which the seal is fastened to the outer surface of the valve stem guide.
Bei den bekannten Ausführungen von Ventilschaftabdichtungen wird der Halteteil aus dem gleichen Werkstoff wie der Dichtkörper gefertigt und durch eine Blechhülse mit gleichmäßiger Wandstärke versteift. Diese Blechhülse übergreift den einstückig mit der Dichtlippe ausgebildeten Halteteil, der über den gesamten Sitzbereich mit der Ventilführung aus elastomerem Werkstoff gefertigt ist.In the known designs of valve stem seals, the holding part is made of the same material as the sealing body and stiffened by a sheet metal sleeve with a uniform wall thickness. This sheet metal sleeve engages over the holding part, which is formed in one piece with the sealing lip and is made of elastomer material over the entire seating area with the valve guide.
Bei dieser bekannten Lösung fallen Haftsitzbereich und statische Abdichtung gegenüber der Ventilführung zusammen. Auch benötigt diese Ausführung einen relativ großen Aufwand an elastomerem Werkstoff.In this known solution, the adhesive seat area and the static seal coincide with the valve guide. This version also requires a relatively large amount of elastomeric material.
Es ist auch bekannt, den Befestigungs- oder Halteteil ganz aus Gummi zu fertigen und in diesen einen separaten Dichtring aus Kunstharz einzusetzen (DE-U-1 871 039). Bei dieser bekannten Ausführung ist in den Halteteil aus Gummi ebenfalls ein Versteifungsring aus Metall oder einem sonstigen Hartstoff eingesetzt. Auch bei dieser Ausführung wird ein relativ großer Aufwand an Gummi benötigt.It is also known to manufacture the fastening or holding part entirely from rubber and to use a separate sealing ring made of synthetic resin therein (DE-U-1 871 039). In this known embodiment, a stiffening ring made of metal or another hard material is also inserted into the rubber holding part. A relatively large amount of rubber is also required in this embodiment.
Aufgabe der vorliegenden Erfindung ist es, eine Ventilschaftabdichtung zu schaffen, bei der die Anzahl der Einzelteile und/oder der Aufwand an hochwertigem Dichtungswerkstoff verringert wird, aber gleichzeitig eine gute Befestigung und Abdichtung gewährleistet ist.The object of the present invention is to provide a valve stem seal in which the number of individual parts and / or the outlay on high-quality sealing material is reduced, but at the same time good fastening and sealing is ensured.
Diese Aufgabe wird nach der vorliegenden Erfindung durch die im kennzeichnenden Teil des Anspruches 1 aufgeführten Merkmale gelöst. Der Halteteil weist im hinteren Bereich einen relativ steifen Abschnitt auf, der zur sicheren Befestigung der Ventilschaftabdichtung auf der Ventilführung dient, während im vorderen Abschnitt durch die Verjüngung Platz zur Aufnahme der statischen Dichtung geschaffen wird, die gleichzeitig die Dichtlippe zur Abdichtung des Ventilschaftes trägt. Besondere Versteifungsringe können entfallen. Bei der erfindungsgemäßen Lösung liegt somit eine klare Trennung zwischen Haftsitzbereich und statischer Abdichtung vor. Auch ist der die statische Dichtung bildende Teil wesentlich kürzer, wodurch eine Ersparnis an Elastomermaterial erzielt wird.This object is achieved according to the present invention by the features listed in the characterizing part of claim 1. The holding part has a relatively rigid section in the rear area, which serves to securely fasten the valve stem seal on the valve guide, while in the front section the taper creates space for receiving the static seal, which at the same time carries the sealing lip for sealing the valve stem. Special stiffening rings can be omitted. In the solution according to the invention, there is therefore a clear separation between the adhesive seat area and the static seal. The part forming the static seal is also considerably shorter, which means that elastomer material is saved.
In den Unteransprüchen sind besondere Ausführungsmöglichkeiten der Erfindung beschrieben.Particular embodiments of the invention are described in the subclaims.
Ein Ausführungsbeispiel der Erfindung soll nachstehend anhand der beigefügten Zeichnung näher beschrieben werden.An embodiment of the invention will be described below with reference to the accompanying drawings.
Die im Längsschnitt dargestellte Ventilschaftabdichtung besteht aus einem Dichtkörper 1 aus Elastomer, der eine radial nach innen gerichtete Dichtlippe 2 aufweist, die unter der Vorspannung einer Feder 3 gegen die Mantelfläche 4 des Ventilschaftes 5 abdichtend anliegt. Der Dichtkörper 1 ist an einem Halteteil 6 befestigt, der z. B. aus einem zähharten Kunststoff gefertigt ist. Dieser Halteteil 6 weist im die Ventilstangenführung 7 übergreifenden Abschnitt 8 einen vorderen in der Wandstärke verjüngten und radial nach außen zurückgesetzten Bereich 9 für die Aufnahme des Dichtkörpers 1 und einen hinteren verstärkten Bereich 10 zur unmittelbaren Anlage auf der Mantelfläche 11 der Ventilstangenführung 7 auf.The valve stem seal shown in longitudinal section consists of a sealing body 1 made of elastomer, which has a radially inwardly directed sealing lip 2, which bears sealingly under the pretension of a spring 3 against the lateral surface 4 of the valve stem 5. The sealing body 1 is attached to a holding part 6 which, for. B. is made of a tough plastic. This holding part 6 has, in the section 8 overlapping the valve rod guide 7, a front region 9 which is tapered in the wall thickness and set back radially outwards for receiving the sealing body 1 and a rear reinforced region 10 for direct contact with the lateral surface 11 of the valve rod guide 7.
Der Dichtkörper 1 ist über einen ringförmigen Ansatz 12 in dem verjüngten Bereich 9 des Halteteiles 6, z. B. durch Eingießen oder Vulkanisation, befestigt, wobei die Bohrung 13 zur Bildung einer statischen Dichtung unter Vorspannung auf der Mantelfläche 11 der Ventilstangenführung 7 aufliegt. Zur Verbesserung der Dichtwirkung ist die Bohrung 13 des ringförmigen Ansatzes 12 mit einem Wellenprofil 14 versehen.The sealing body 1 is an annular extension 12 in the tapered area 9 of the holding part 6, for. B. by pouring or vulcanization, the bore 13 rests to form a static seal under prestress on the lateral surface 11 of the valve rod guide 7. To improve the sealing effect, the bore 13 of the annular extension 12 is provided with a wave profile 14.
Zur leichteren Montage ist der Halteteil 6 im hinteren verstärkten Bereich 10 in der Bohrung 13 mit einer Schräge 15 versehen. Außerdem ist der Halteteil 6 in diesem Bereich 10 mit mehreren am Umfang verteilten, axial verlaufenden (gestrichelt gezeichneten) Schlitzen 16 versehen, durch die der Halteteil 6 elastisch federnd wird und unter Vorspannung auf der Mantelfläche 11 der Ventilstangenführung 7 aufgesetzt werden kann. Dadurch können die Montagekräfte auch bei größeren zu überbrückenden Toleranzen der Ventilführung gering gehalten werden.For easier assembly, the holding part 6 is provided with a bevel 15 in the rear reinforced area 10 in the bore 13. In addition, the holding part 6 in this area 10 is provided with a plurality of axially extending (dashed) slots 16 distributed around the circumference, through which the holding part 6 becomes elastically resilient and can be placed under prestress on the lateral surface 11 of the valve rod guide 7. As a result, the assembly forces can be kept low even with larger tolerances of the valve guide to be bridged.
Claims (7)
- A valve stem seal, comprising a sealing member of elastomer with a spring for preloading the sealing lip against a surface of the valve stem to be sealed, and a retaining part which is connected to the sealing member and by way of which the seal is mounted on the circumferential surface of the valve stem guide, characterised in that in its section overlapping the valve stem guide the retaining part (6) has a front region (9), which is of tapered wall thickness and which is set back radially from the valve guide, for accommodating the sealing member (1) of elastomer, and a rear portion (10), which is of increased wall thickness, for direct application on the circumferential surface (11) of the valve stem guide (7).
- A valve stem seal according to Claim 1, characterised in that the sealing member (1) is mounted via an annular extension (12) in the tapered region (9) of the retaining part (6).
- A valve stem seal according to Claim 2, characterised in that the annular extension (12) is mounted with its bore (13) applied under radial preloading on the circumferential surface (11) of the valve stem guide (7).
- A valve stem seal according to either Claim 2 or Claim 3, characterised in that the bore (13) of the annular extension (12) is provided with a corrugated profile (14).
- A valve stem seal according to any one of Claims 1 to 4, characterised in that in its rear reinforced portion (10) the bore (13) of the retaining part (6) is provided with a bevel (15).
- A valve stem seal according to any one of Claims 1 to 5, characterised in that in its rear reinforced portion (10) the retaining part (6) is provided with at least one slot (16) extending in the axial direction.
- A valve stem seal according to any one of Claims 1 to 6, characterised in that the retaining part (6) is made from a tough hard plastics material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19736322 | 1997-08-21 | ||
| DE19736322A DE19736322C1 (en) | 1997-08-21 | 1997-08-21 | Valve stem seal |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0898057A2 EP0898057A2 (en) | 1999-02-24 |
| EP0898057A3 EP0898057A3 (en) | 1999-03-24 |
| EP0898057B1 true EP0898057B1 (en) | 2002-02-27 |
Family
ID=7839674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98115063A Expired - Lifetime EP0898057B1 (en) | 1997-08-21 | 1998-08-11 | Valve stem seal |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0898057B1 (en) |
| DE (2) | DE19736322C1 (en) |
| ES (1) | ES2173534T3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108488481A (en) * | 2018-03-08 | 2018-09-04 | 浙江工贸职业技术学院 | A kind of valve rod leak-proof structure |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6202616B1 (en) * | 1999-02-17 | 2001-03-20 | Briggs & Stratton Corporation | Valve seal assembly for an internal combustion engine |
| JP4373761B2 (en) * | 2003-10-21 | 2009-11-25 | 日野自動車株式会社 | Valve guide structure |
| JP2010242823A (en) * | 2009-04-03 | 2010-10-28 | Nok Corp | Sealing device |
| DE102020003214A1 (en) | 2020-05-28 | 2021-12-02 | Daimler Ag | Valve stem seal for an internal combustion engine of a motor vehicle |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1871039U (en) | 1963-01-18 | 1963-04-25 | Goetzewerke | BRACKET FOR A RUBBER SPRING FOR SEALING A VALVE STEM SEAL RING. |
| US3625525A (en) * | 1967-06-21 | 1971-12-07 | Gen Motors Corp | Valve steam seal assembly |
| DE6933319U (en) * | 1969-08-22 | 1969-12-11 | Lechler Elring Dichtungswerke | VALVE STEM SEAL |
| DE4318051B4 (en) * | 1993-05-29 | 2009-06-10 | Skf Sealing Solutions Gmbh | Lip seal ring, in particular valve stem seal |
| DE9308125U1 (en) * | 1993-05-29 | 1993-08-05 | Goetze Ag, 51399 Burscheid, De |
-
1997
- 1997-08-21 DE DE19736322A patent/DE19736322C1/en not_active Expired - Fee Related
-
1998
- 1998-08-11 EP EP98115063A patent/EP0898057B1/en not_active Expired - Lifetime
- 1998-08-11 ES ES98115063T patent/ES2173534T3/en not_active Expired - Lifetime
- 1998-08-11 DE DE59803171T patent/DE59803171D1/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108488481A (en) * | 2018-03-08 | 2018-09-04 | 浙江工贸职业技术学院 | A kind of valve rod leak-proof structure |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59803171D1 (en) | 2002-04-04 |
| EP0898057A3 (en) | 1999-03-24 |
| ES2173534T3 (en) | 2002-10-16 |
| EP0898057A2 (en) | 1999-02-24 |
| DE19736322C1 (en) | 1999-04-08 |
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