EP0566059B1 - Seal for a rod sliding against the action of elastic means, in particular an internal combustion engine valve stem - Google Patents
Seal for a rod sliding against the action of elastic means, in particular an internal combustion engine valve stem Download PDFInfo
- Publication number
- EP0566059B1 EP0566059B1 EP93105970A EP93105970A EP0566059B1 EP 0566059 B1 EP0566059 B1 EP 0566059B1 EP 93105970 A EP93105970 A EP 93105970A EP 93105970 A EP93105970 A EP 93105970A EP 0566059 B1 EP0566059 B1 EP 0566059B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stiffener
- seal
- stem
- elastomeric element
- centering
- 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
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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 seal for a rod sliding against the action of elastic means, in particular an internal combustion engine valve stem.
- Known elastomeric seals for preventing leakage of the supply system lubricating oil into the combustion chamber of the engine substantially consist of a substantially sleeve-shaped sealing portion, and a sleeve-shaped assembly portion fitted in a seat formed externally on the valve stem guide.
- the assembly portion normally presents a rigid metal stiffener, normally outside the co-molded assembly portion, and which provides for ensuring correct positioning of the seal.
- the ends of the valve stem contrast springs facing the cylinder head normally rest on metal caps in turn resting directly on the cylinder head.
- a seal for a rod sliding against the action of elastic means as claimed in Claim 1 and a device for the guide and the sealing of a stem as claimed in claim 3.
- Number 1 in the accompanying drawings indicates a seal for a sliding rod 2, and particularly in the example shown for the stem 2 of an intake or exhaust valve 3 (shown only partially in Fig.1) of an internal combustion engine of which the cylinder head 4 is shown partially.
- Seal 1 comprises a substantially sleeve-shaped elastomeric element 5, in turn comprising a sealing portion 6 cooperating with stem 2 of valve 3, and an assembly portion 7 designed to fit inside a substantially cylindrical seat 8 on the guide element 11 of stem 2.
- a stiffener 12 is provided inside and formed integral with assembly portion 7.
- Sealing portion 6 presents two inner projecting sealing lips 13 cooperating in sliding manner with the outer surface 14 of stem 2 of valve 3, for preventing oil from leaking towards cylinder head 4 and into the engine through guide element 11 of stem 2.
- sealing portion 6 presents an outer annular pressure element, e.g. an annular spring 15, for exerting predetermined radial pressure on sealing lips 13 between which an oil collecting chamber 16 is formed.
- an outer annular pressure element e.g. an annular spring 15
- stiffener 12 is co-molded with elastomeric element 5, and comprises, outside element 5, a portion 21 for supporting and centering a spring 22 contrasting axial movement of stem 2 of valve 3.
- Supporting and centering portion 21 extends radially and axially outwards in relation to elastomeric element 5, and on the opposite side in relation to sealing portion 6.
- supporting and centering portion 21 in turn presents a first substantially flat supporting surface 23 designed to rest on a corresponding flat surface 24 of cylinder head 4; while a second surface 25, opposite surface 23, supports end 26 of contrast spring 22.
- supporting and centering portion 21 is thus gripped between cylinder head 4 and end 26 of spring 22, and, via stiffener 12, provides for maintaining assembly portion 7 in the design position inside seat 8 and, consequently, for maintaining sealing portion 6 contacting surface 14 of stem 2.
- supporting and centering portion 21 presents a substantially S-shaped radial section, and comprises a first portion 31 blending with stiffener 12 and projecting radially from elastomeric element 5, a second cylindrical portion 32 for centering spring 22 and substantially coaxial with sealing portion 7, and a peripheral supporting portion 33 substantially perpendicular to cylindrical centering portion 32 and having surfaces 23 and 25 on either side.
- the portion of the seal for supporting and centering the coil spring is fixed directly to the assembly portion stiffener and co-molded directly with the elastomeric element, thus enabling the seal (which is gripped inside the seat by the spring) to be maintained in the required position, and automatic centering of the coil spring.
- the supporting portion also provides for dispensing with the spring caps, thus enabling low-cost automated assembly of the seal, and overcoming the noise problem typically associated with spring caps.
Description
- The present invention relates to a seal for a rod sliding against the action of elastic means, in particular an internal combustion engine valve stem.
- Known elastomeric seals for preventing leakage of the supply system lubricating oil into the combustion chamber of the engine substantially consist of a substantially sleeve-shaped sealing portion, and a sleeve-shaped assembly portion fitted in a seat formed externally on the valve stem guide.
- To reinforce the assembly portion and so ensure effective seating of the seal, the assembly portion normally presents a rigid metal stiffener, normally outside the co-molded assembly portion, and which provides for ensuring correct positioning of the seal.
- To prevent wear on the cylinder head, the ends of the valve stem contrast springs facing the cylinder head normally rest on metal caps in turn resting directly on the cylinder head.
- The above solutions are not without drawbacks. Due to vibration and/or particularly after prolonged use, the seal tends to work out of the seat, thus resulting in impaired sealing performance, while the metal caps, by virtue of not being fitted to the cylinder head, are a frequent cause of noise and vibration. Also the seal known from EP-A-0 459 022 though simpler, is not free from the described drawbacks.
- It is an object of the present invention to provide a seal designed to overcome the aforementioned drawbacks, and which provides for troublefree, low-cost, even automated, assembly.
- According to the present invention, there is provided a seal for a rod sliding against the action of elastic means, as claimed in Claim 1 and a device for the guide and the sealing of a stem as claimed in claim 3.
- A non-limiting embodiment of the present invention will be described by way of example with reference to the accompanying drawings, in which:
- Fig.1 shows a front section of a sliding rod seal in accordance with the present invention;
- Fig.2 shows an enlarged front section of a detail on the Fig.1 seal.
- Number 1 in the accompanying drawings indicates a seal for a
sliding rod 2, and particularly in the example shown for thestem 2 of an intake or exhaust valve 3 (shown only partially in Fig.1) of an internal combustion engine of which thecylinder head 4 is shown partially. - Seal 1 comprises a substantially sleeve-shaped
elastomeric element 5, in turn comprising asealing portion 6 cooperating withstem 2 of valve 3, and anassembly portion 7 designed to fit inside a substantiallycylindrical seat 8 on theguide element 11 ofstem 2. Astiffener 12 is provided inside and formed integral withassembly portion 7. -
Sealing portion 6 presents two inner projectingsealing lips 13 cooperating in sliding manner with theouter surface 14 ofstem 2 of valve 3, for preventing oil from leaking towardscylinder head 4 and into the engine throughguide element 11 ofstem 2. - To improve sealing between
lips 13 andsurface 14 ofstem 2,sealing portion 6 presents an outer annular pressure element, e.g. anannular spring 15, for exerting predetermined radial pressure on sealinglips 13 between which anoil collecting chamber 16 is formed. - According to the present invention,
stiffener 12 is co-molded withelastomeric element 5, and comprises,outside element 5, aportion 21 for supporting and centering aspring 22 contrasting axial movement ofstem 2 of valve 3. Supporting and centeringportion 21 extends radially and axially outwards in relation toelastomeric element 5, and on the opposite side in relation to sealingportion 6. - According to the present invention, supporting and centering
portion 21 in turn presents a first substantially flat supportingsurface 23 designed to rest on a correspondingflat surface 24 ofcylinder head 4; while asecond surface 25,opposite surface 23, supportsend 26 ofcontrast spring 22. In use (Fig.2), supporting and centeringportion 21 is thus gripped betweencylinder head 4 andend 26 ofspring 22, and, viastiffener 12, provides for maintainingassembly portion 7 in the design position insideseat 8 and, consequently, for maintaining sealingportion 6 contactingsurface 14 ofstem 2. - In particular, supporting and centering
portion 21 presents a substantially S-shaped radial section, and comprises afirst portion 31 blending withstiffener 12 and projecting radially fromelastomeric element 5, a secondcylindrical portion 32 for centeringspring 22 and substantially coaxial with sealingportion 7, and a peripheral supportingportion 33 substantially perpendicular tocylindrical centering portion 32 and havingsurfaces - The advantages of the present invention will be clear from the foregoing description. In particular, the portion of the seal for supporting and centering the coil spring is fixed directly to the assembly portion stiffener and co-molded directly with the elastomeric element, thus enabling the seal (which is gripped inside the seat by the spring) to be maintained in the required position, and automatic centering of the coil spring. The supporting portion also provides for dispensing with the spring caps, thus enabling low-cost automated assembly of the seal, and overcoming the noise problem typically associated with spring caps.
Claims (3)
- A seal (1) for a rod (2) sliding against the action of elastic means (22), in particular the stem (2) of an internal combustion engine valve (3); the seal (1) comprising: a substantially sleeve-shaped elastomeric element (5), in turn comprising a sealing portion (6) cooperating with said stem (2), and an assembly portion (7) designed to fit inside a seat (8) on a guide element (11) for said stem (2); and a stiffener (12) formed integral with said assembly portion (7); said seal (1) further comprising a cylindrical centering portion (32) substantially coaxial with said sealing portion (6), for centering said elastic means (22) and, in combination, a peripheral supporting portion (33) substantially perpendicular to said cylindrical centering portion (32) and comprising a first shoulder surface (23) faced in the direction of introduction of said assembly portion (6) in said seat (8) and a second shoulder surface (25), opposite to the first one, able to receive and support said elastic means (22); said supporting and centering portions (33,32) being a one piece with the stiffener (12) of the assembly portion (7); said portions (33,32) being connected to said stiffener (12) via a blending portion (31) projecting radially from said elastomeric element (5) and forming therewith a portion (21) of the stiffener (12) having substantially S-shaped radial section and extending radially and axially outwards in relation to said elastomeric element (5), and on the opposite side in relation to said sealing portion (6); characterized in that said stiffener (12) is co-molded with said elastomeric element (5) and embedded inside the same; said substantially S-shaped portion (21) of the stiffener (12) extending outwards of said elastomeric element (5).
- A seal (1) as claimed in Claim 1, characterized by the fact that said supporting and centering portion (21) presents said first (23) and second (25) surfaces on either side.
- Device for the guide and the sealing of a stem (2) of an internal combustion engine valve (3), comprising a guide element (11) fitted integrally inside a cylinder head (4) of the engine, a coil spring (22) coaxial with said stem (2) and with said guide element (11) and resting on said cylinder head (4), said stem (2) sliding within said guide element (11) against the action of said coil spring (22), and a seal (1) comprising an elastomeric sealing element (5), in turn comprising a sealing portion (6) cooperating with said stem (2), and an assembly portion (7) designed to fit inside a seat (8) on said guide element (11) and a stiffener (12) for reinforcing said elastomeric element (5); said seal (1) further comprising a cylindrical centering portion (32) substantially coaxial with said sealing portion (6), for centering said coil spring (22) and, in combination, a peripheral supporting portion (33) substantially perpendicular to said cylindrical centering portion (32) and comprising a first shoulder surface (23) faced in the direction of introduction of said assembly portion (7) in said seat (8) and a second shoulder surface (25), opposite to the first one, able to receive and support said elastic means (22); said portions (33,32) being connected to said stiffener (12) via a blending portion (31) projecting radially from said elastomeric element (5) and forming therewith a portion (21) having substantially S-shaped radial section and extending radially and axially outwards in relation to said elastomeric element (5), and on the opposite side in relation to said sealing portion (6); characterized in that- said supporting and centering portions (33,32) are a one piece with the stiffener (12), which is formed integral with the assembly portion (7), said stiffener (12) being co-molded with said elastomeric element (5) and embedded inside the same;- said substantially S-shaped portion (21) of the stiffener (12) extending outwards of said elastomeric element (5) so as to be gripped between said cylinder head (4) of said engine and said coil spring (22).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO920106 | 1992-04-14 | ||
IT000106 IT227530Y1 (en) | 1992-04-14 | 1992-04-14 | SEAL GASKET FOR A SLIDING STEM AGAINST THE ACTION OF ELASTIC DEVICES, IN PARTICULAR FOR A VALVE STEM OF A COMBU ENGINE |
ITTO920106U | 1992-04-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0566059A1 EP0566059A1 (en) | 1993-10-20 |
EP0566059B1 true EP0566059B1 (en) | 1997-09-17 |
Family
ID=11410035
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93105970A Expired - Lifetime EP0566059B1 (en) | 1992-04-14 | 1993-04-13 | Seal for a rod sliding against the action of elastic means, in particular an internal combustion engine valve stem |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0566059B1 (en) |
DE (1) | DE69313907T2 (en) |
ES (1) | ES2106216T3 (en) |
IT (1) | IT227530Y1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003021085A1 (en) * | 2001-08-28 | 2003-03-13 | Dana Corporation | Valve stem seal assembly with valve guide retainer |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4788906B2 (en) * | 2006-05-19 | 2011-10-05 | Nok株式会社 | Valve stem seal |
DE102013201033A1 (en) * | 2012-01-30 | 2013-08-01 | GM Global Technology Operations LLC (n.d. Ges. d. Staates Delaware) | 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 |
CN104358599A (en) * | 2014-11-18 | 2015-02-18 | 烟台润蚨祥油封有限公司 | Low-friction air valve oil seal |
JP7034753B2 (en) * | 2018-02-19 | 2022-03-14 | Nok株式会社 | Sealing device and sealing structure |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0392893A1 (en) * | 1989-04-12 | 1990-10-17 | Automobiles Peugeot | Valve guiding and sealing device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1375628A (en) * | 1963-11-30 | 1964-10-16 | Goetzewerke | Fixing device for valve stem seal |
US4834037A (en) * | 1987-10-14 | 1989-05-30 | Dana Corporation | Unitary molded plastic valve seal |
DE4017010A1 (en) * | 1990-05-26 | 1991-11-28 | Goetze Ag | VALVE SEAL |
-
1992
- 1992-04-14 IT IT000106 patent/IT227530Y1/en active IP Right Grant
-
1993
- 1993-04-13 ES ES93105970T patent/ES2106216T3/en not_active Expired - Lifetime
- 1993-04-13 DE DE1993613907 patent/DE69313907T2/en not_active Expired - Fee Related
- 1993-04-13 EP EP93105970A patent/EP0566059B1/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0392893A1 (en) * | 1989-04-12 | 1990-10-17 | Automobiles Peugeot | Valve guiding and sealing device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003021085A1 (en) * | 2001-08-28 | 2003-03-13 | Dana Corporation | Valve stem seal assembly with valve guide retainer |
US6679502B1 (en) | 2001-08-28 | 2004-01-20 | Dana Corporation | Valve stem seal assembly with valve guide retainer |
Also Published As
Publication number | Publication date |
---|---|
ITTO920106U1 (en) | 1993-10-14 |
IT227530Y1 (en) | 1997-12-15 |
ITTO920106V0 (en) | 1992-04-14 |
EP0566059A1 (en) | 1993-10-20 |
DE69313907D1 (en) | 1997-10-23 |
DE69313907T2 (en) | 1998-01-29 |
ES2106216T3 (en) | 1997-11-01 |
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