EP2626524B1 - Hybride Halterungsanordnung einer Ventilschaftdichtung - Google Patents

Hybride Halterungsanordnung einer Ventilschaftdichtung Download PDF

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Publication number
EP2626524B1
EP2626524B1 EP13154493.4A EP13154493A EP2626524B1 EP 2626524 B1 EP2626524 B1 EP 2626524B1 EP 13154493 A EP13154493 A EP 13154493A EP 2626524 B1 EP2626524 B1 EP 2626524B1
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EP
European Patent Office
Prior art keywords
metal
seal
valve guide
elastomeric
retainer
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.)
Not-in-force
Application number
EP13154493.4A
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English (en)
French (fr)
Other versions
EP2626524A1 (de
Inventor
Timothy A. Hegemier
Alexander S. Williamson
Robert W. Lehmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dana Automotive Systems Group LLC
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Dana Automotive Systems Group LLC
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Filing date
Publication date
Application filed by Dana Automotive Systems Group LLC filed Critical Dana Automotive Systems Group LLC
Publication of EP2626524A1 publication Critical patent/EP2626524A1/de
Application granted granted Critical
Publication of EP2626524B1 publication Critical patent/EP2626524B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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 present invention relates to a valve stem seal retainer assembly. More particularly, the present invention relates to a valve stem seal retainer assembly utilizing an elastomeric-to-metal seal area and a metal-to-metal grip area with a valve guide.
  • valve stem seal assembly cooperates with a reciprocating valve stem shaft to provide lubrication and contain engine gases within engine inlet and exhaust ports (not shown).
  • the valve stem seal assembly typically includes an elastomeric seal with an attached metal retainer that is installed over a metal valve guide.
  • valve stem seal assembly takes advantage of an elastomeric-to-metal seal between the elastomeric seal and the valve guide or a metal-to-metal grip between the retainer and the valve guide.
  • Fig. 1 illustrates a prior art side seal valve stem assembly 10.
  • An elastomeric seal 12, with a garter spring 14 disposed thereon, are utilized to seal a valve stem shaft 16 of the valve stem assembly 10.
  • Fig. 2 illustrates a prior art top seal valve stem assembly 30.
  • An elastomeric seal 32 with a retainer 34 disposed thereto, are utilized to seal the valve stem shaft 36 at the top of the valve stem assembly 30.
  • the retainer 34 in this case, is utilized to directly grip a valve guide 38 at a single metal-to-metal grip area 26.
  • U.S. Patent No. 6,244,235 teaches an integral valve stem seal retainer and spring seat for a valve seal subassembly that discloses having lower, intermediate and upper portions.
  • An annular sealing member is bonded to the intermediate and upper portions of the metal retainer and an annular flange extends radially outwardly of the lower portion of the retainer to engage at least one coil of a valve spring.
  • the annular sealing member further includes upper and lower portions, wherein the upper portion engages an outer surface of a valve stem while the lower portion engages a top of a thin-walled valve guide.
  • valve stem seals like those in Figs. 1 and 2 , are being exposed to increased lifting forces, which in turn require the seals 12, 32 to resist being pushed off of the valve guides 22, 38 by these forces.
  • past valve stem seals are not capable of sustaining the increased lifting forces.
  • the elastomeric seal material fails to retain the seal, which results in loss of lubrication control and engine gases escaping through the valve stem and guide interface (not shown).
  • elastomeric seal manufacturers are increasing the seal to guide interference of the elastomeric material.
  • increasing the seal to guide interference of the elastomeric seal then requires the seal to be installed with a greater installation load (i.e., force) which quite often results in over-installing the elastomeric seal or cutting the elastomer during initial installation or during cylinder head servicing. In either of these cases, the valve stem seal assembly fails to function properly.
  • the invention concerns a valve stem seal assembly in accordance with claim 1, which realizes the advantages sought for in the preceding paragraph.
  • a valve stem seal assembly comprises an elastomeric seal, a metal retainer disposed within a side of the elastomeric seal, and a metal valve guide.
  • the metal valve guide is in an elastomeric-to-metal seal with the elastomeric seal on a side of the metal valve guide.
  • the metal valve guide is in a metal-to-metal grip with the metal retainer, which has a stop formed therein. The stop is in a block contact with a shoulder on the metal valve guide to prevent over-installation of the assembly of an elastomeric seal with attached retainer.
  • another valve stem seal assembly comprises an elastomeric seal and a metal retainer that has first and second inward vertical surfaces, with a continuous metal retainer stop therebetween.
  • the elastomeric seal is disposed on the first inward vertical surface of the metal retainer at a top of a valve stem seal assembly where the elastomeric seal is in an elastomeric-to-metal seal with the metal retainer.
  • a metal valve guide has first and second outward vertical surfaces, where the second outward vertical surface of the metal valve guide is in a metal-to-metal grip with the second inward vertical surface of the metal retainer, from the bottom of the continuous metal retainer stop down to the bottom of the metal retainer.
  • the present invention is founded upon the premise of two separate functions associated with a valve stem seal assembly: a) better sealing a metal valve guide and b) retaining an elastomeric valve seal with retainer on a metal valve guide, so as to maintain the pressure and engine gases within an inlet or exhaust port. It has been found that using both the elastomeric valve seal to seal and a metal retainer to grip, the elastomeric valve seal takes advantage of each of these items material strengths while avoiding their weaknesses. Also, by a use of a stop on the metal retainer, in conjunction with a complementary shoulder on the metal valve guide, over installation of the elastomeric valve seal on the metal valve guide is prevented. In addition, the stop keeps the metal valve guide from making contact with unintended portions of the elastomeric valve seal that can distort, for example, the sealing contact made by the seal with a valve stem shaft.
  • Fig. 3 illustrates a side seal valve stem seal assembly 40 comprising an elastomeric seal 42 (comprised of, for example, a fluoroelastomer, abbreviated FKM), a biasing member 44 (such as a garter spring as shown in Fig. 3 ), a metal retainer 46, and a metal valve guide 48, which cooperate with a valve stem shaft 50, so as to better seal the metal valve guide 48, to retain the elastomeric seal 42 with the retainer 46 on the metal valve guide 48, and to maintain the pressure and engine gases within an inlet or exhaust port (not shown).
  • FKM fluoroelastomer
  • FKM fluoroelastomer
  • biasing member 44 such as a garter spring as shown in Fig. 3
  • metal retainer 46 such as a garter spring as shown in Fig. 3
  • a metal valve guide 48 which cooperate with a valve stem shaft 50, so as to better seal the metal valve guide 48, to retain the elastomeric seal 42 with the
  • the configuration of an upper portion 45 (i.e., that vertical area between the top of the seal 42, where the reference line for item 42 is pointing, and where the reference line for the sealing lip 55 is pointing) of the present invention side seal assembly 40 can be of any form, for example, unsupported, R-ring, garter spring, Allbond (trademark of Dana Corporation), etc.
  • This assembly 40 can also be of any style, for example, multi-lip, radius lip, square lip, gas lip, etc.
  • an upper portion of the metal retainer 46 is defined to be where the metal retainer 46 is horizontally molded into the side of the elastomeric seal 42, just below the garter spring 44 of the elastomeric seal 42. At the garter spring 44, there is a force horizontally applied radially inward on the seal 42 to better seal the seal 42 to the valve stem shaft 50.
  • the seal 42 is attached by way of an adhesive (common in the art) to a first inward vertical surface 47 of the metal retainer 46, where the first inward vertical surface 47 is located above a stop 82.
  • the assembly 40 provides an elastomeric-to-metal seal between the seal 42 and a valve guide first upper outward vertical surface 52, which is the uppermost vertical surface of the metal valve guide 48 and which is located above the stop 82. It is noted that the designations in the present "Detailed Description,” of first, second, third, etc., as applied to the various surfaces of the elements of Figs. 3 and 4 , may differ from the designations in the present "Claims,” of first, second, third, etc., as applied to those same surfaces of the elements of Figs. 3 and 4 .
  • the assembly 40 provides a metal-to-metal grip between a metal retainer second inward vertical surface 53 and a metal valve guide second outward vertical surface 54, where both vertical surfaces 53, 54 are located below the stop 82.
  • valve stem seal assembly 40 seals and grips the metal valve guide 48 with two surfaces 52, 54 in contact with corresponding retainer surfaces 57, 53.
  • these two surfaces 52, 54 of the metal valve guide 48 take advantage of the elastomeric characteristics of the seal 42 to seal and the metal characteristics of the retainer 46 to grip the metal valve guide 48.
  • valve stem seal assembly 40 As a result of the valve stem seal assembly 40, high pressure gases within the vehicle inlet and exhaust ports (not shown) do not pass by the metal valve guide 48, because the valve guide 48 is strongly sealed by the seal 42 and gripped by the retainer 46, so as to maintain the high pressure and engine gases within the inlet and exhaust ports.
  • Fig. 4 illustrates a top seal valve stem seal assembly 60 comprising an elastomeric seal 62 (comprised of, for example, a fluoroelastomer, abbreviated FKM), a metal retainer 66, and a metal valve guide 68, which cooperate with the valve stem shaft 70.
  • FKM fluoroelastomer
  • the elastomeric seal 62 is disposed, for example, by way of an adhesive (common in the art), on a first inward vertical surface 72 of the metal retainer 66 at a top (i.e., from where the reference line 62 is pointing to the stop 84) of the valve stem seal assembly 60.
  • a radially inwardly directed force is applied by the metal retainer 66 on the elastomeric seal 62 to seal the elastomeric seal 62 to a valve stem shaft 70, when a press-fit assembly of these parts 62, 66 is made to the valve stem shaft 70.
  • the metal valve guide 68 is in an elastomeric-to-metal seal with the elastomeric seal 62, at the top 67 of the metal valve guide 68, where a lower extension 74 of the seal 62 seals an upper outward chamfer surface 90 on a top corner of the valve guide 68. Also shown is the metal retainer 66 being in a first metal-to-metal grip, which may be optional, with the metal valve guide 68 between the first retainer inward vertical surface 75 and the first valve guide outward vertical surface 76, which extends from the bottom of the upper outward chamfer surface 90 to an upper horizontal surface 83 of the metal valve guide 68.
  • valve stem seal assembly 60 seals/grips the metal valve guide 68 off in at least two areas, i.e., the seal extension 74 and the vertical grip surfaces 75, 76, instead of the single grip area 26, as prior art valve stem seal assembly 30 provides.
  • this double sealing/grip of the metal valve guide 68 is accomplished while taking advantage of both the elastomeric characteristics of the seal 62 to seal and the metal characteristics of the retainer 66 to grip the valve guide 68.
  • valve stem seal assembly 60 As a result of the structure of the valve stem seal assembly 60, the gases, which are under high pressure within the inlet and exhaust ports, do not pass by the metal valve guide 68, because the valve guide 68 is strongly sealed by the seal 62 and also gripped at vertical surfaces 75, 76 between the retainer 66 and the valve guide 68, so as to maintain the high pressure within the inlet and exhaust ports.
  • corresponding retainer stops 82, 84 may be formed (for example, unitarily) in corresponding retainers 46, 66, as shown in Figs. 3 and 4 respectively.
  • the retainer stops 82, 84 may have various shapes
  • Fig. 3 illustrates the stop 82 to be of an inwardly directed sideway-oriented male U-shape that is formed within the retainer 46.
  • the elastomeric seal 42 extends below the center of the stop 82.
  • the stop 84 to be of an outwardly directed shape (i.e., from its top portion to its lower portion), formed within the retainer 66.
  • the shape of the stop 84 would be outwardly angular, possibly at 45°, to a valve guide shoulder 88.
  • the two stops 82, 84 are associated with corresponding valve guide shoulders 86, 88. Although these shoulders 86, 88 may have various shapes, Figs. 3 and 4 show these shoulders 86, 88 being formed as female notches in the form of a step with respect to valve guides 48, 68.
  • Upper horizontal surfaces 81, 83 of the respective shoulders 86, 88 are parallel to and formed radially inwardly toward respective valve stem shaft 50, 70 toward corresponding lower horizontal surfaces 85, 87.
  • Each of the respective valve guide horizontal surfaces 81, 85 and 83, 87 are perpendicular to corresponding valve guide vertical surfaces 89, 91.
  • Each of these valve guide vertical surfaces 89, 91 is formed radially inwardly from its respective shoulder 86, 88, so as to receive the corresponding stop 82, 84. As shown in Fig. 3 , the elastomeric seal 42 may extend radially inwardly below the valve guide horizontal surface 81.
  • each stop 82, 84 makes contact with its respective female shoulder 86, 88, at the uppermost point of the respective inward second vertical surface 53, 98, as respectively shown in Fig. 3, Fig. 4 .
  • the valve guides 48, 68 are wider below the shoulders 86, 88 than above the shoulders 86, 88.
  • the seal 42 curves around the stop 82 and also protrudes inwardly along the upper outward horizontal surface 81, thereby better sealing off the passage of gases along the interface of the two surfaces 52, 57. Consequently, the stops 82, 84 prevent over-installation of the assemblies of the seals 42, 62, with attached retainers 46, 66, so as to maintain the pressure and engine gases within an inlet or exhaust port.
  • stops 82, 84 and the shoulders 86, 88 may not be required and the metal retainers 46, 66 may be disposed in a vertically straight orientation along their corresponding valve guide 48, 68.
  • valve stem seal assembly 60 seal/grip the metal valve guide 68 off with added areas.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Claims (12)

  1. Ventilschaft-Abdichtungsanordnung (40; 60), welche aufweist:
    eine Elastomerdichtung (42; 62);
    einen Metallhalter (46; 66) mit einer oberen (47; 75) und einer unteren (53; 96) einwärtigen vertikalen Oberfläche, mit einem kontinuierlichen Metallanschlag (82; 84), der dazwischen gebildet ist; und
    eine Metallventilführung (48; 68) in einer Elastomer-Metall-Dichtung mit der Elastomerdichtung (42; 62) auf einer ersten vertikalen Außenfläche (52; 76) der Metallventilführung (48; 68);
    wobei die untere vertikale Innenfläche (53; 96) des Metallhalters (46; 66) in Kontakt mit einer zweiten vertikalen Außenfläche (54; 96) der Metallventilführung (48; 68) ist, und sowohl die untere vertikale Innenfläche (53; 96) des Metallhalters (46; 66) als auch die zweite vertikale Außenfläche (54; 96) der Metallventilführung (48; 68) unterhalb des Anschlags (82; 84) sind, der Anschlag (82; 84) in einem Bockierkontakt mit einer Schulter (86; 88) an der Metallventilführung (48; 68) ist, um eine Überinstallation der Elastomerdichtung (42; 62) und des Metallhalters (46; 66) zu verhindern, und die Schulter (86; 88) an der Metallventilführung (46; 68) oberhalb des unteren Bereichs des Metallhalters (46; 66) sind;
    dadurch gekennzeichnet, dass
    die Metallventilführung (48; 68) weiterhin eine dritte vertikale Außenfläche (89; 91) hat, die durch eine erste (81; 83) und eine zweite (85; 87) horizontale Oberfläche der Metallventilführung einwärts getrennt zwischen der ersten (52; 76) und der zweiten (54; 96) vertikalen Außenfläche der Metallventilführung angeordnet ist, wobei die zweite vertikale Außenfläche (54; 96) der Metallventilführung unterhalb der dritten vertikalen Außenfläche (89; 91) der Metallventilführung ist, und der Halteranschlag (82; 84) sich abwärts zu der weitesten radialen Ausdehnung der zweiten horizontalen Oberfläche (85; 87) der Metallventilführung erstreckt und sich die Schulter (86; 88) an dieser befindet.
  2. Ventilschaft-Abdichtungsanordnung (40; 60) nach Anspruch 1, bei der der Metallhalter (46; 66) innerhalb einer Seite der Elastomerdichtung (42; 62) angeordnet ist,
  3. Ventilschaft-Abdichtungsanordnung (40; 60) nach Anspruch 2, bei der die Elastomerdichtung (42; 62) an der oberen vertikalen Innenfläche (47; 72) des Metallhalters (46, 66) angebracht ist und/oder weiterhin eine ringförmige Schraubenfeder (44) aufweist, um eine Kraft radial einwärts auf die Elastomerdichtung (42; 62) auszuüben, um die Elastomerdichtung (42; 62) gegenüber einem Ventilschaft (50; 70) abzudichten, und/oder bei der die Elastomerdichtung (42; 62) eine Abdichtlippe (55) aufweist, die sich abwärts erstreckt und gleichzeitig nach innen gekrümmt ist von direkt unterhalb der Stelle, an der der Metallhalter (46; 66) innerhalb der Seite der Elastomerdichtung (42; 62) angeordnet ist, um die Elastomerdichtung (42; 62) gegenüber einem Ventilschaft (50; 70) abzudichten, und/oder wobei sich die Elastomerdichtung (42; 62) unterhalb einer horizontalen Oberfläche (81; 83) einer Ventilführung einwärts erstreckt und/oder wobei sich die Elastomerdichtung (42; 62) unter die Mitte des Halteranschlags (82; 84) erstreckt,
  4. Ventilschaft-Abdichtungsanordnung (40; 60) nach Anspruch 1, bei der die Elastomerdichtung (42; 62) auf der oberen vertikalen Innenfläche (47; 72) des Metallhalters (46; 66) an einer Oberseite einer Ventilschaft-Abdichtungsanordnung (40; 60) und in einer Elastomer-Metall-Abdichtung mit dem Metallhalter (46; 66) angeordnet ist.
  5. Ventilschaft-Abdichtungsanordnung (60) nach Anspruch 1, bei der die Metallventilführung (68) eine erste vertikale Außenfläche in einem Metall-Metall-Eingriff mit der oberen vertikalen Innenfläche (72) des Metallhalters (66) hat, von der Unterseite einer oberen äußeren Schrägfläche (90) an einer oberen Ecke der Ventilführung (68) bis zu einer oberen horizontalen Oberfläche (83) der Metallventilführung (68).
  6. Ventilschaft-Abdichtungsanordnung (60) nach Anspruch 5, bei der die Elastomerdichtung (62) in einer Elastomer-Metall-Abdichtung mit der Metallventilführung (68) zu der Oberseite der Metallventilführung (68) hin ist und die erste vertikale Außenfläche (76) der Metallventilführung (68) in einem zweiten Metall-Metall-Eingriff mit der ersten vertikalen Innenfläche (72) des Metallhalters (66) abwärts bis zu der ersten horizontalen Oberfläche (83) der Metallventilführung (68) ist.
  7. Ventilschaft-Abdichtungsanordnung (60) nach Anspruch 1, bei der sich die Elastomerdichtung (62) auf der oberen vertikalen Innenfläche (72) des Metallhalters (66) an einer Oberseite einer Ventilschaft-Abdichtungsanordnung und in einer Elastamer-Metall-Abdichtung mit dem Metallhalter (66) befindet.
  8. Ventilschaft-Abdichtungsanordnung (60) nach Anspruch 7, bei der die Elastomerdichtung (62) auf der ersten vertikalen Innenfläche (72) des Metallhalters (66) an einer Oberseite einer Ventilschaft-Abdichtungsanordnung befindet, und/oder bei der die Elastomerdichtung (62) in einer Elastomer-Metall-Abdichtung mit der Metallventilführung (68) an der Oberseite der Metallventilführung (68) ist und die Metallventilführung (68) eine dritte Außenfläche (91) hat, wobei die dritte Außenfläche (91) der Metallventilführung (68) durch eine horizontale Ventilführungsfläche an der Unterseite des Halteranschlags (84) einwärts von der zweiten Außenfläche der Ventilführung (68) getrennt ist.
  9. Ventilschaft-Abdichtungsanordnung (60) nach Anspruch 7, bei der die Elastomerdichtung (62) in einer Elastomer-Metall-Abdichtung mit der Metallventilführung (68) zu der Oberseite der Metallventilführung (68) hin ist und die Metallventilführung (68) eine dritte vertikale Außenfläche (91) und eine erste (83) und eine zweite (87) horizontale Oberfläche hat, die senkrecht zu der ersten (76), der zweiten und der dritten (91) vertikalen Außenfläche der Metallventilführung sind,
    wobei die dritte vertikale Außenfläche (91) der Metallventilführung durch die erste (83) und die zweite (87) horizantale Oberfläche der Metallventilführung von der ersten (76) und der zweiten vertikalen Oberfläche der Metallventilführung einwärts getrennt ist, und die zweite horizontale Oberfläche (87) sich an der Unterseite des kontinuierlichen Metallhalteranschlags (84) befindet;
    wobei die erste vertikale Außenfläche der Metallventilführung (68) in einem zweiten Metall-Metalf-Eingriff mit der ersten vertikalen Innenfläche (76) des Metallhalters (66) abwärts bis zu der ersten horizontalen Oberfläche (83) der Metallventilführung (68) ist.
  10. Ventilschaft-Abdichtungsanordnung (60) nach Anspruch 9, bei der die Elastomerabdichtung (62) nicht tiefer als eine Schräge (90) an einer oberen Ecke der Metallventilführung (68) installiert ist.
  11. Ventilschaft-Abdichtungsanordnung (60) nach Anspruch 7, bei der der Halteranschlag (48) eine auswärts gerichtete Winkelform von einem oberen Bereich des Anschlags (84) zu einem unteren Bereich von diesem hat.
  12. Ventilschaft-Abdichtungsanordnung (60) nach Anspruch 7, bei der die Elastomerdichtung (62) eine Abdichtlippe (55) aufweist, die sich abwärts erstreckt und gleichzeitig nach innen gekrümmt ist von einer Stelle direkt oberhalb einer Oberseite der Metallventilführung (68), um die Elastomerdichtung (62) gegenüber einem Ventilschaft (70) abzudichten, und die Metallventilführung (68) in einer Elastomer-Metall-Abdichtung mit der Elastomerdichtung (62) an der Oberseite der Metallventilführung (68) ist, wobei eine untere Verlängerung der Dichtung eine Schräge (90) an einer oberen Ecke der Ventilführung (68) abdichtet.
EP13154493.4A 2012-02-08 2013-02-07 Hybride Halterungsanordnung einer Ventilschaftdichtung Not-in-force EP2626524B1 (de)

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US201261596297P 2012-02-08 2012-02-08

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EP2626524B1 true EP2626524B1 (de) 2017-10-04

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US11608760B2 (en) 2020-05-04 2023-03-21 Caterpillar Inc. Stem seal for valve assembly of machine engine

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US9463527B2 (en) 2012-11-08 2016-10-11 Dana Automotive Systems Group, Llc Tube profile machining process
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WO2017034619A1 (en) * 2015-08-24 2017-03-02 Dana Automotive Systems Group, Llc Valve stem seal assembly with heat dissipating retainer

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11608760B2 (en) 2020-05-04 2023-03-21 Caterpillar Inc. Stem seal for valve assembly of machine engine

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CN103244684A (zh) 2013-08-14
CN103244684B (zh) 2017-08-11
EP2626524A1 (de) 2013-08-14

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