US20130192555A1 - Engine exhaust valve stem seal for high temperature and pressure applications - Google Patents
Engine exhaust valve stem seal for high temperature and pressure applications Download PDFInfo
- Publication number
- US20130192555A1 US20130192555A1 US13/427,180 US201213427180A US2013192555A1 US 20130192555 A1 US20130192555 A1 US 20130192555A1 US 201213427180 A US201213427180 A US 201213427180A US 2013192555 A1 US2013192555 A1 US 2013192555A1
- Authority
- US
- United States
- Prior art keywords
- annular body
- seal
- axial end
- stem
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
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 generally relates to an exhaust valve stem seal assembly for an internal combustion engine.
- a valve guide is positioned within a cylinder head of an internal combustion engine to guide an exhaust valve in reciprocating motion.
- the valve guide supports and guides a stem of the exhaust valve for axially movement along a valve axis. Clearance is provided between the valve guide and the exhaust valve stem in order to allow free movement between the valve guide and the exhaust valve stem.
- a stem seal assembly is coupled to the valve guide and seals against the stem of the exhaust valve to prevent combustion gases from escaping through the clearance between the exhaust valve stem and the valve guide.
- the exhaust valve stem seal assembly further meters oil into the valve guide to lubricate between the valve stem and the valve guide.
- the stem seal assembly is generally comprised of a steel casing supporting an elastomeric seal.
- the elastomeric seal expands when subjected to high temperatures and high exhaust gas pressures. This thermal expansion of the elastomeric seal reduces the ability of the elastomeric seal to maintain oil flow to the valve guide, which may result in excessive wear of the valve guide.
- a seal assembly for an exhaust valve stem of an engine includes a casing having an annular body portion that extends between a first axial end and a second axial end along a valve axis.
- the annular body portion further defines an interior.
- An elastomeric seal is coupled to the casing.
- the elastomeric seal includes a guide seal portion, a stem seal portion, and a shoulder portion.
- the guide seal portion is disposed within the interior of the annular body portion for engaging a valve guide.
- the stem seal portion extends away from the casing and the second axial end of the annular body portion along the valve axis for engaging a valve stem.
- the shoulder portion interconnects the guide seal portion and the stem seal portion adjacent the second axial end of the annular body portion.
- the stem seal portion includes a gas lip that extends radially inward toward the valve axis and toward the first axial end of the annular body portion.
- a void is defined between the gas lip and the shoulder portion of the elastomeric seal.
- the casing includes a frustoconical shoulder extending from the second axial end of the annular body portion to a distal edge of the frustoconical shoulder. The frustoconical shoulder extends radially inward toward the valve axis and away from the first axial end of the annular body portion.
- the exhaust valve stem seal assembly includes a casing having an annular body portion extending between a first axial end and a second axial end along a valve axis.
- the annular body portion defines an interior.
- An elastomeric seal is coupled to the casing.
- the elastomeric seal includes a guide seal portion, a stem seal portion and a shoulder portion.
- the guide seal portion is disposed within the interior of the annular body portion for engaging a valve guide.
- the stem seal portion extends away from the casing and the second axial end of the annular body portion along the valve axis for engaging a valve stem.
- the shoulder portion interconnects the guide seal portion and the stem seal portion.
- the stem seal portion includes a gas lip that extends radially inward toward the valve axis and toward the first axial end of the annular body portion.
- a void is defined between the gas lip and the shoulder portion of the elastomeric seal.
- the casing includes a frustoconical shoulder that extends from the second axial end of the annular body portion to a distal edge.
- the frustoconical shoulder extends radially inward toward the valve axis and away from the first axial end of the annular body portion to the distal edge.
- the distal edge of the frustoconical shoulder is substantially aligned with the gas lip along the valve axis.
- the frustoconical shoulder defines an angle relative to a plane that is perpendicular to the valve axis between the range of 5° and 45°.
- the frustoconical shoulder of the casing angles from the annular body portion of the casing toward the gas lip, and extends from the second axial end of the annular body portion to the distal edge of the frustoconical shoulder, which is located immediately behind the gas lip.
- the distal edge of the frustoconical shoulder acts as a hinge or pivot point to allow the stem seal portion of the elastomeric seal to expand and rotate away from the stem of the exhaust valve, thereby maintaining the proper shape and configuration of the gas lip and preventing the void located behind the gas lip from collapsing.
- lubricating oil may be properly metered past the gas lip into the clearance between the valve guide and the exhaust valve stem for lubrication therebetween.
- FIG. 1 is a schematic partial cross sectional view of an exhaust valve stem seal assembly sealing against a valve stem supported by a valve guide.
- FIG. 2 is a schematic cross sectional view of the exhaust valve stem seal assembly.
- FIG. 3 is a schematic enlarged fragmentary cross sectional view of the exhaust valve stem seal.
- seal assembly 20 is generally shown at 20 .
- the seal assembly 20 may be referred to as an exhaust valve stem seal assembly 20 .
- a valve guide 22 is disposed within a bore 23 of a cylinder head 24 .
- the valve guide 22 defines a central bore 25 that slideably supports a stem 26 of an exhaust valve 28 for reciprocating movement along a valve axis 30 .
- the valve axis 30 is located along a longitudinal center of the stem 26 .
- the seal assembly 20 is coupled or attached to the valve guide 22 .
- the seal assembly 20 includes a casing 32 supporting an elastomeric seal 34 .
- the casing 32 includes an annular body portion 36 that extends along the valve axis 30 between a first axial end 38 and a second axial end 40 of the annular body portion 36 .
- the annular body portion 36 includes a generally tubular shape and defines an interior 42 .
- the casing 32 includes a frustoconical shoulder 44 that extends from the second axial end 40 of the annular body portion 36 to a distal edge 46 .
- the frustoconical shoulder 44 extends radially inward toward the valve axis 30 , and also extends away from the first axial end 38 of the annular body portion 36 to the distal edge 46 .
- the frustoconical shoulder 44 includes a frustoconical shape generally defined as a cone shape with the tip of the cone removed. While the frustoconical shoulder 44 is shown to include a planar cross section, it should be appreciated that the frustoconical shoulder 44 may alternatively include a slightly curved cross sectional shape, such as but not limited to a slightly convex cross sectional shape.
- a flange 48 extends radially outward from the first axial end 38 of the annular body portion 36 , away from the valve axis 30 .
- the cross section of the frustoconical shoulder 44 is substantially disposed along a plane 49 .
- the plane 49 is disposed relative to a plane 50 , which is perpendicular to the valve axis 30 , to define an angle 52 therebetween.
- the angle 52 between the plane 49 of the frustoconical shoulder 44 and the plane 50 is preferably between the range of 5° and 45°.
- the casing 32 may include and be manufactured from a metal, such as but not limited to steel. However, the casing 32 may be manufactured from some other suitable material.
- the elastomeric seal 34 is coupled to the casing 32 .
- the elastomeric seal 34 includes and is manufactured from an elastomer suitable for sealing against the valve guide 22 and the stem 26 of the exhaust valve 28 in a high temperature and high pressure environment.
- the elastomeric seal 34 includes a guide seal portion 54 , a stem seal portion 56 , and a shoulder portion 58 .
- the guide seal portion 54 is disposed within the interior 42 of the annular body portion 36 of the casing 32 .
- the guide seal portion 54 engages the valve guide 22 in sealing/frictional engagement therewith.
- the stem seal portion 56 extends away from the casing 32 and the second axial end 40 of the annular body portion 36 , along the valve axis 30 .
- the stem seal portion 56 extends from the second axial end 40 of the annular body portion 36 in a direction opposite the first axial end 38 of the annular body portion 36 . Accordingly, the stem seal portion 56 is not radially constrained about the valve axis 30 by the casing 32 , thereby allowing the stem seal portion 56 to expand radially in response to increased temperature and pressure.
- a garter spring clip 60 is disposed within a groove 62 defined by the stem seal portion 56 of the elastomeric seal 34 to radially bias the stem seal portion 56 against the stem 26 of the exhaust valve 28 .
- the stem seal portion 56 engages the stem 26 of the exhaust valve 28 in sealing engagement therewith.
- the shoulder portion 58 interconnects the guide seal portion 54 and the stem seal portion 56 , and is disposed adjacent the second axial end 40 of the annular body portion 36 of the casing 32 .
- the stem seal portion 56 includes a gas lip 64 .
- the gas lip 64 seals against the stem 26 of the exhaust valve 28 to prevent gases from escaping through the interface between the valve guide 22 and the stem 26 of the exhaust valve 28 . While the gas lip 64 prevents gases from escaping in a direction indicated by arrow 66 , the gas lip 64 allows lubricating oil to pass in a direction opposite arrow 66 , to lubricate the interface between the valve guide 22 and the stem 26 of the exhaust valve 28 .
- the gas lip 64 extends radially inward toward the valve axis 30 , and extends toward the first axial end 38 of the annular body portion 36 .
- the gas lip 64 is spaced from the shoulder portion 58 of the elastomeric seal 34 to define a void 68 between the gas lip 64 and the shoulder portion 58 .
- the distal edge 46 of the frustoconical shoulder 44 is positioned to substantially align with the gas lip 64 along the valve axis 30 .
- the distal edge 46 of the frustoconical shoulder 44 is disposed radially outward of the gas lip 64 , and is disposed at approximately the same axial location along the valve axis 30 as the gas lip 64 .
- the distal edge 46 of the frustoconical shoulder 44 is within an axial distance of the gas lip 64 measured along the valve axis 30 .
- the axial distance is equal to twice a distance 76 between a bottom or lower edge 78 of the gas lip 64 and a top or upper edge 80 of the void 68 as measured along the valve axis 30 .
- the lower surface 82 of the distal edge 46 of the frustoconical shoulder 44 is spaced from the first axial end 38 of the annular body a distance 70 that is equal to or less than, within acceptable manufacturing tolerances, a distance 72 between a lower edge 84 of a base of the gas lip 64 and the first axial end 38 of the annular body.
- the base of the gas lip 64 is the general location at which the gas lip 64 is attached to and extends from the stem seal portion 56 , and is generally indicated by the dashed line 74 .
- the distal edge 46 acts as a hinge or pivot to allow the stem seal portion 56 to rotate upward and away from the casing 32 .
- the frustoconical shoulder 44 allows the stem seal portion 56 of the elastomeric seal 34 to rotate radially outward away from the valve axis 30 and axially away from the first axial end 38 of the annular body portion 36 of the casing 32 in response to thermal expansion of the elastomeric seal 34 . Allowing the stem seal portion 56 to rotate in this fashion maintains a substantially constant pressure and contact width between the gas lip 64 and the stem 26 of the exhaust valve 28 , which maintains proper functionality of the gas lip 64 in high temperature and high pressure environments.
Abstract
Description
- This application claims the benefit of U.S. Provisional Patent Application Ser. No. 61/592,174, filed on Jan. 30, 2012, the disclosure of which is hereby incorporated by reference.
- The invention generally relates to an exhaust valve stem seal assembly for an internal combustion engine.
- In some internal combustion engines, a valve guide is positioned within a cylinder head of an internal combustion engine to guide an exhaust valve in reciprocating motion. The valve guide supports and guides a stem of the exhaust valve for axially movement along a valve axis. Clearance is provided between the valve guide and the exhaust valve stem in order to allow free movement between the valve guide and the exhaust valve stem. A stem seal assembly is coupled to the valve guide and seals against the stem of the exhaust valve to prevent combustion gases from escaping through the clearance between the exhaust valve stem and the valve guide. The exhaust valve stem seal assembly further meters oil into the valve guide to lubricate between the valve stem and the valve guide.
- The stem seal assembly is generally comprised of a steel casing supporting an elastomeric seal. The elastomeric seal expands when subjected to high temperatures and high exhaust gas pressures. This thermal expansion of the elastomeric seal reduces the ability of the elastomeric seal to maintain oil flow to the valve guide, which may result in excessive wear of the valve guide.
- A seal assembly for an exhaust valve stem of an engine is provided. The seal assembly includes a casing having an annular body portion that extends between a first axial end and a second axial end along a valve axis. The annular body portion further defines an interior. An elastomeric seal is coupled to the casing. The elastomeric seal includes a guide seal portion, a stem seal portion, and a shoulder portion. The guide seal portion is disposed within the interior of the annular body portion for engaging a valve guide. The stem seal portion extends away from the casing and the second axial end of the annular body portion along the valve axis for engaging a valve stem. The shoulder portion interconnects the guide seal portion and the stem seal portion adjacent the second axial end of the annular body portion. The stem seal portion includes a gas lip that extends radially inward toward the valve axis and toward the first axial end of the annular body portion. A void is defined between the gas lip and the shoulder portion of the elastomeric seal. The casing includes a frustoconical shoulder extending from the second axial end of the annular body portion to a distal edge of the frustoconical shoulder. The frustoconical shoulder extends radially inward toward the valve axis and away from the first axial end of the annular body portion.
- An exhaust valve stem seal assembly for an engine is provided. The exhaust valve stem seal assembly includes a casing having an annular body portion extending between a first axial end and a second axial end along a valve axis. The annular body portion defines an interior. An elastomeric seal is coupled to the casing. The elastomeric seal includes a guide seal portion, a stem seal portion and a shoulder portion. The guide seal portion is disposed within the interior of the annular body portion for engaging a valve guide. The stem seal portion extends away from the casing and the second axial end of the annular body portion along the valve axis for engaging a valve stem. The shoulder portion interconnects the guide seal portion and the stem seal portion. The stem seal portion includes a gas lip that extends radially inward toward the valve axis and toward the first axial end of the annular body portion. A void is defined between the gas lip and the shoulder portion of the elastomeric seal. The casing includes a frustoconical shoulder that extends from the second axial end of the annular body portion to a distal edge. The frustoconical shoulder extends radially inward toward the valve axis and away from the first axial end of the annular body portion to the distal edge. The distal edge of the frustoconical shoulder is substantially aligned with the gas lip along the valve axis. The frustoconical shoulder defines an angle relative to a plane that is perpendicular to the valve axis between the range of 5° and 45°.
- Accordingly, the frustoconical shoulder of the casing angles from the annular body portion of the casing toward the gas lip, and extends from the second axial end of the annular body portion to the distal edge of the frustoconical shoulder, which is located immediately behind the gas lip. As such, as the stem seal portion of the elastomeric seal expands in response to high temperatures and high pressure, the distal edge of the frustoconical shoulder acts as a hinge or pivot point to allow the stem seal portion of the elastomeric seal to expand and rotate away from the stem of the exhaust valve, thereby maintaining the proper shape and configuration of the gas lip and preventing the void located behind the gas lip from collapsing. By maintaining the proper shape and configuration of the gas lip, and by preventing the void from collapsing, lubricating oil may be properly metered past the gas lip into the clearance between the valve guide and the exhaust valve stem for lubrication therebetween.
- The above features and advantages and other features and advantages of the present invention are readily apparent from the following detailed description of the best modes for carrying out the invention when taken in connection with the accompanying drawings.
-
FIG. 1 is a schematic partial cross sectional view of an exhaust valve stem seal assembly sealing against a valve stem supported by a valve guide. -
FIG. 2 is a schematic cross sectional view of the exhaust valve stem seal assembly. -
FIG. 3 is a schematic enlarged fragmentary cross sectional view of the exhaust valve stem seal. - Those having ordinary skill in the art will recognize that terms such as “above,” “below,” “upward,” “downward,” “top,” “bottom,” etc., are used descriptively for the figures, and do not represent limitations on the scope of the invention, as defined by the appended claims.
- Referring to the Figures, wherein like numerals indicate like parts throughout the several views, a seal assembly is generally shown at 20. The
seal assembly 20 may be referred to as an exhaust valvestem seal assembly 20. - Referring to
FIG. 1 , avalve guide 22 is disposed within abore 23 of acylinder head 24. Thevalve guide 22 defines a central bore 25 that slideably supports astem 26 of anexhaust valve 28 for reciprocating movement along avalve axis 30. Thevalve axis 30 is located along a longitudinal center of thestem 26. Theseal assembly 20 is coupled or attached to thevalve guide 22. - Referring also to
FIGS. 2 and 3 , theseal assembly 20 includes acasing 32 supporting anelastomeric seal 34. Thecasing 32 includes anannular body portion 36 that extends along thevalve axis 30 between a firstaxial end 38 and a secondaxial end 40 of theannular body portion 36. Theannular body portion 36 includes a generally tubular shape and defines aninterior 42. Thecasing 32 includes afrustoconical shoulder 44 that extends from the secondaxial end 40 of theannular body portion 36 to adistal edge 46. Thefrustoconical shoulder 44 extends radially inward toward thevalve axis 30, and also extends away from the firstaxial end 38 of theannular body portion 36 to thedistal edge 46. Thefrustoconical shoulder 44 includes a frustoconical shape generally defined as a cone shape with the tip of the cone removed. While thefrustoconical shoulder 44 is shown to include a planar cross section, it should be appreciated that thefrustoconical shoulder 44 may alternatively include a slightly curved cross sectional shape, such as but not limited to a slightly convex cross sectional shape. Aflange 48 extends radially outward from the firstaxial end 38 of theannular body portion 36, away from thevalve axis 30. - Referring to
FIG. 3 , the cross section of thefrustoconical shoulder 44 is substantially disposed along aplane 49. Theplane 49 is disposed relative to aplane 50, which is perpendicular to thevalve axis 30, to define anangle 52 therebetween. Theangle 52 between theplane 49 of thefrustoconical shoulder 44 and theplane 50 is preferably between the range of 5° and 45°. Thecasing 32 may include and be manufactured from a metal, such as but not limited to steel. However, thecasing 32 may be manufactured from some other suitable material. - The
elastomeric seal 34 is coupled to thecasing 32. Theelastomeric seal 34 includes and is manufactured from an elastomer suitable for sealing against thevalve guide 22 and thestem 26 of theexhaust valve 28 in a high temperature and high pressure environment. Theelastomeric seal 34 includes aguide seal portion 54, astem seal portion 56, and ashoulder portion 58. Theguide seal portion 54 is disposed within theinterior 42 of theannular body portion 36 of thecasing 32. Theguide seal portion 54 engages thevalve guide 22 in sealing/frictional engagement therewith. Thestem seal portion 56 extends away from thecasing 32 and the secondaxial end 40 of theannular body portion 36, along thevalve axis 30. Accordingly, thestem seal portion 56 extends from the secondaxial end 40 of theannular body portion 36 in a direction opposite the firstaxial end 38 of theannular body portion 36. Accordingly, thestem seal portion 56 is not radially constrained about thevalve axis 30 by thecasing 32, thereby allowing thestem seal portion 56 to expand radially in response to increased temperature and pressure. As shown, agarter spring clip 60 is disposed within agroove 62 defined by thestem seal portion 56 of theelastomeric seal 34 to radially bias thestem seal portion 56 against thestem 26 of theexhaust valve 28. Thestem seal portion 56 engages thestem 26 of theexhaust valve 28 in sealing engagement therewith. Theshoulder portion 58 interconnects theguide seal portion 54 and thestem seal portion 56, and is disposed adjacent the secondaxial end 40 of theannular body portion 36 of thecasing 32. - As best shown in
FIG. 3 , thestem seal portion 56 includes agas lip 64. Thegas lip 64 seals against thestem 26 of theexhaust valve 28 to prevent gases from escaping through the interface between thevalve guide 22 and thestem 26 of theexhaust valve 28. While thegas lip 64 prevents gases from escaping in a direction indicated byarrow 66, thegas lip 64 allows lubricating oil to pass in a direction oppositearrow 66, to lubricate the interface between thevalve guide 22 and thestem 26 of theexhaust valve 28. Thegas lip 64 extends radially inward toward thevalve axis 30, and extends toward the firstaxial end 38 of theannular body portion 36. Thegas lip 64 is spaced from theshoulder portion 58 of theelastomeric seal 34 to define a void 68 between thegas lip 64 and theshoulder portion 58. - As best shown in
FIG. 3 , thedistal edge 46 of thefrustoconical shoulder 44 is positioned to substantially align with thegas lip 64 along thevalve axis 30. In other words, thedistal edge 46 of thefrustoconical shoulder 44 is disposed radially outward of thegas lip 64, and is disposed at approximately the same axial location along thevalve axis 30 as thegas lip 64. Preferably, thedistal edge 46 of thefrustoconical shoulder 44 is within an axial distance of thegas lip 64 measured along thevalve axis 30. The axial distance is equal to twice adistance 76 between a bottom orlower edge 78 of thegas lip 64 and a top or upper edge 80 of the void 68 as measured along thevalve axis 30. Preferably, but not necessarily, thelower surface 82 of thedistal edge 46 of thefrustoconical shoulder 44 is spaced from the firstaxial end 38 of the annular body a distance 70 that is equal to or less than, within acceptable manufacturing tolerances, adistance 72 between a lower edge 84 of a base of thegas lip 64 and the firstaxial end 38 of the annular body. The base of thegas lip 64 is the general location at which thegas lip 64 is attached to and extends from thestem seal portion 56, and is generally indicated by the dashedline 74. - By positioning the
gas lip 64 at the approximate same axial location along thevalve axis 30 as thedistal edge 46 of thefrustoconical shoulder 44, thedistal edge 46 acts as a hinge or pivot to allow thestem seal portion 56 to rotate upward and away from thecasing 32. More specifically, thefrustoconical shoulder 44 allows thestem seal portion 56 of theelastomeric seal 34 to rotate radially outward away from thevalve axis 30 and axially away from the firstaxial end 38 of theannular body portion 36 of thecasing 32 in response to thermal expansion of theelastomeric seal 34. Allowing thestem seal portion 56 to rotate in this fashion maintains a substantially constant pressure and contact width between thegas lip 64 and thestem 26 of theexhaust valve 28, which maintains proper functionality of thegas lip 64 in high temperature and high pressure environments. - The detailed description and the drawings or figures are supportive and descriptive of the invention, but the scope of the invention is defined solely by the claims. While some of the best modes and other embodiments for carrying out the claimed invention have been described in detail, various alternative designs and embodiments exist for practicing the invention defined in the appended claims.
Claims (11)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/427,180 US20130192555A1 (en) | 2012-01-30 | 2012-03-22 | Engine exhaust valve stem seal for high temperature and pressure applications |
DE201310201033 DE102013201033A1 (en) | 2012-01-30 | 2013-01-23 | Seal assembly for exhaust gas valve stem of combustion engine, has housing which is provided with frustum-shaped shoulder that extends from axial end of annular portion to distal edge |
CN2013100372955A CN103225523A (en) | 2012-01-30 | 2013-01-30 | A sealing assembly of an exhaust valve stem used for an engine in high temperature and high pressure |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201261592174P | 2012-01-30 | 2012-01-30 | |
US13/427,180 US20130192555A1 (en) | 2012-01-30 | 2012-03-22 | Engine exhaust valve stem seal for high temperature and pressure applications |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130192555A1 true US20130192555A1 (en) | 2013-08-01 |
Family
ID=48869162
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/427,180 Abandoned US20130192555A1 (en) | 2012-01-30 | 2012-03-22 | Engine exhaust valve stem seal for high temperature and pressure applications |
Country Status (1)
Country | Link |
---|---|
US (1) | US20130192555A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9052018B2 (en) | 2011-07-11 | 2015-06-09 | Dana Automotive Systems Group, Inc. | Eccentricity tolerant valve stem seal assembly |
EP3239513A1 (en) * | 2016-04-25 | 2017-11-01 | Continental Automotive GmbH | Valve closure member with an elastomeric seal, valve assembly and fluid injector |
US20180112564A1 (en) * | 2016-10-21 | 2018-04-26 | Freudenberg Sealing Technologies S.A.S. Di Externa Italia S.R.L.U | Gasket for a valve of an internal combustion engine |
US20180163580A1 (en) * | 2015-08-20 | 2018-06-14 | Nok Corporation | Valve stem seal and hermetic sealing structure |
US20180238283A1 (en) * | 2017-02-21 | 2018-08-23 | Jason Mangum | Systems and methods associated with a unified double valve spring seat and valve seat |
US20180363802A1 (en) * | 2015-12-08 | 2018-12-20 | Nok Corporation | Valve stem seal |
CN110173318A (en) * | 2018-02-19 | 2019-08-27 | Nok株式会社 | A kind of sealing device and seal construction |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5237971A (en) * | 1991-06-18 | 1993-08-24 | Goetze Ag | Valve stem seal assembly |
-
2012
- 2012-03-22 US US13/427,180 patent/US20130192555A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5237971A (en) * | 1991-06-18 | 1993-08-24 | Goetze Ag | Valve stem seal assembly |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9052018B2 (en) | 2011-07-11 | 2015-06-09 | Dana Automotive Systems Group, Inc. | Eccentricity tolerant valve stem seal assembly |
US20180163580A1 (en) * | 2015-08-20 | 2018-06-14 | Nok Corporation | Valve stem seal and hermetic sealing structure |
US10767519B2 (en) * | 2015-08-20 | 2020-09-08 | Nok Corporation | Valve stem seal and hermetic sealing structure |
US20180363802A1 (en) * | 2015-12-08 | 2018-12-20 | Nok Corporation | Valve stem seal |
US10962142B2 (en) * | 2015-12-08 | 2021-03-30 | Nok Corporation | Valve stem seal |
EP3239513A1 (en) * | 2016-04-25 | 2017-11-01 | Continental Automotive GmbH | Valve closure member with an elastomeric seal, valve assembly and fluid injector |
US20180112564A1 (en) * | 2016-10-21 | 2018-04-26 | Freudenberg Sealing Technologies S.A.S. Di Externa Italia S.R.L.U | Gasket for a valve of an internal combustion engine |
US10260385B2 (en) * | 2016-10-21 | 2019-04-16 | Freudenberg Sealing Technologies S.A.S. Di Externa Italia S.R.L.U. | Gasket for a valve of an internal combustion engine |
US20180238283A1 (en) * | 2017-02-21 | 2018-08-23 | Jason Mangum | Systems and methods associated with a unified double valve spring seat and valve seat |
CN110173318A (en) * | 2018-02-19 | 2019-08-27 | Nok株式会社 | A kind of sealing device and seal construction |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20130192555A1 (en) | Engine exhaust valve stem seal for high temperature and pressure applications | |
US9052018B2 (en) | Eccentricity tolerant valve stem seal assembly | |
US9625038B2 (en) | Gasket for a valve of an internal combustion engine | |
US7854191B2 (en) | Three-piece oil ring and combination of the three-piece oil ring and piston | |
US7862048B2 (en) | Gasket for a valve in an internal combustion engine | |
US6938877B2 (en) | Valve stem seal assembly | |
CN108368938B (en) | Valve oil seal | |
US9347343B2 (en) | Gasket for a valve of an internal-combustion engine | |
EP3315830B1 (en) | Reciprocating cylinder liner seal assembly | |
US7299779B2 (en) | Upside-down square-up valve stem seal | |
US8246006B2 (en) | Articulating guide seal | |
JP2006046655A (en) | Valve rod seal assembly | |
JP3196250U (en) | Gasket for internal combustion engine valve | |
EP3258144B1 (en) | Piston ring assembly | |
US20120061920A1 (en) | Oil ring mechanism of a piston | |
US8555850B2 (en) | Two-piece compression piston ring of an internal combustion engine | |
CN215371246U (en) | Valve stem seal and assembly | |
EP1818514A1 (en) | Sealing apparatus | |
JP6378569B2 (en) | Valve stem seal | |
US20040200451A1 (en) | Dual spring valve stem seal module | |
SE0301620D0 (en) | Sealing joints on an internal combustion engine | |
JP2016098933A (en) | Valve stem seal | |
JP7034753B2 (en) | Sealing device and sealing structure | |
CN103225523A (en) | A sealing assembly of an exhaust valve stem used for an engine in high temperature and high pressure | |
US8468994B2 (en) | Lubeless valve assembly for engine |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: GM GLOBAL TECHNOLOGY OPERATIONS LLC, MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NGUYEN, HONG WAI;REEL/FRAME:027910/0408 Effective date: 20120316 |
|
AS | Assignment |
Owner name: WILMINGTON TRUST COMPANY, DELAWARE Free format text: SECURITY AGREEMENT;ASSIGNOR:GM GLOBAL TECHNOLOGY OPERATIONS LLC;REEL/FRAME:030694/0500 Effective date: 20101027 |
|
AS | Assignment |
Owner name: GM GLOBAL TECHNOLOGY OPERATIONS LLC, MICHIGAN Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:WILMINGTON TRUST COMPANY;REEL/FRAME:034287/0415 Effective date: 20141017 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |