EP0745758A1 - Poppet valve device - Google Patents
Poppet valve device Download PDFInfo
- Publication number
- EP0745758A1 EP0745758A1 EP95401006A EP95401006A EP0745758A1 EP 0745758 A1 EP0745758 A1 EP 0745758A1 EP 95401006 A EP95401006 A EP 95401006A EP 95401006 A EP95401006 A EP 95401006A EP 0745758 A1 EP0745758 A1 EP 0745758A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- valve stem
- circumferential surface
- guide
- outer circumferential
- 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.)
- Withdrawn
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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
-
- 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
- F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
Definitions
- the present invention relates to a poppet valve device, and especially to a poppet valve device to increase oil keeping capability of the contacting surface between the valve and a valve guide, thereby decreasing wear of the surface.
- Fig. 5 illustrates a conventional poppet valve device, in which a valve stem 23a of a poppet valve 23 is fitted to be axially slidable in a cylindrical valve guide 22 which is in a press fit with a cylinder head 21 of an internal combustion engine.
- a valve head 23b of the poppet valve 23 is engaged on a valve seat 24 which is in a press fit with the lower end of the cylinder head 21.
- the poppet valve 23 is reciprocated in an axial direction by a rocker arm 25 which is engaged on the upper end of the valve stem 23a, thereby supplying and exhausting a gas.
- 26 denotes a lip seal which is attached on the upper end of the valve guide 22, so that excessive oil is not flowed into the contacting surface between the valve stem 23a and the valve guide 22.
- a groove on the outer circumferential surface 23c of the valve stem 23a or the inner circumferential surface 22a of the valve guide 22 to increase oil keeping capability, but such a groove decreases the strength and rigidity of the valve stem 23a.
- a poppet valve device comprising a valve which comprises a valve stem and a valve head; and a valve guide which is in a press fit with a cylinder head, the valve stem being slidably engaged in the valve guide, the valve being axially reciprocated by feeding and exhausting a gas in an internal combustion engine, on one of the outer circumferential surface of the valve stem and the inner circumferential surface of the valve guide, an annular or spiral groove being formed, porous material which has oil keeping capability being engaged in the groove.
- the porous material is provided in the annular or spiral groove on the valve stem or the valve guide, thereby maintaining oil which is flowed in through a gap between the valve stem and the valve guide. Owing to reciprocating motion of the poppet valve, maintained oil is uniformly supplied to the contacting surface between the valve guide and the valve stem in proper quantities. Thus, no local wear occurs on the outer circumferential surface of the valve stem or the inner circumferential surface of the valve guide, and no noise occurs during reciprocating motion of the valve. Also, it is prevented for oil to go down since oil is maintained.
- the porous material in the annular or spiral groove does not decrease strength and rigidity of the valve stem or valve guide.
- annular grooves 7 there are formed two annular grooves 7 at the ends of the outer circumferential surface of a valve stem 3a of a valve 3, the outer circumferential surface of the valve stem 3a being slidably engaged in a valve guide 2.
- ring-shaped porous materials 8 partially cut out are tightly engaged, as shown in Fig. 2, the materials having oil keeping capability and elasticity.
- the porous materials 8 elastically expanded may be engaged around the annular grooves 7 before the valve 3 is inserted in the valve guide 2. After engagement, the outer diameter of the porous material 8 may be roughly equal to the outer diameter of the valve stem 3a.
- porous material 8 for example, powder metallurgical material, metal fiber felt, foamed metal and hard foam resin are suitable.
- porous material 8 around the annular groove 7
- integral molding may be made, and the surface of the porous material 8 may be made to be equal to the outer diameter of the valve stem 3a by mechanical processing after molding.
- the porous material used in molding may include foam resin and porous ceramics.
- the porous material 8 always maintains oil which comes through a gap between the lip seal and the valve stem 3a, and owing to reciprocating motion of the valve 3, maintained oil may be uniformly supplied onto the whole contacting surface between the valve stem 3a and the valve guide 2 in proper quantities.
- Fig. 3 illustrates an embodiment in which a hard porous plate 10 which has low specific gravity is fixed or engaged around the outer circumferential surface of an annular thin plate 9 made of spring steel etc. to form a porous material 11, thereby reducing weight of the porous material 11, so that increase in weight of the valve may be at minimum.
- porous material may be coated or porous phosphate or sulfuric acid coating may be formed on the outer circumferential surface of the annular thin plate 9. A number of pores may be formed in the annular thin plate 9.
- the second embodiment will be described with respect to Fig. 4.
- the same numerals are allotted to the same members as those in the first embodiment, and its detailed description will be omitted.
- a spiral groove 12 on which spiral porous material 8 or 11 as mentioned above are tightly engaged.
- annular groove 7 or spiral groove 12 on which the porous material 8 or 11 are attached, but there may be formed a groove or grooves on the inner circumferential surface of the valve guide 2 on which porous material is attached.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
A poppet valve is used in an internal combustion engine, and comprises a valve stem and valve head. The valve stem is surrounded by a valve guide and slidably engaged therein. On one of the outer circumferential surface of the valve stem and the inner circumferential surface of the valve guide, there is formed an annular or spiral groove, in which porous material is engaged, the material having oil keeping capability, thereby supplying oil uniformly onto the contacting surface between the valve stem and the valve guide. Thus, local wear is prevented.
Description
- The present invention relates to a poppet valve device, and especially to a poppet valve device to increase oil keeping capability of the contacting surface between the valve and a valve guide, thereby decreasing wear of the surface.
- Fig. 5 illustrates a conventional poppet valve device, in which a
valve stem 23a of a poppet valve 23 is fitted to be axially slidable in acylindrical valve guide 22 which is in a press fit with acylinder head 21 of an internal combustion engine. - A
valve head 23b of the poppet valve 23 is engaged on avalve seat 24 which is in a press fit with the lower end of thecylinder head 21. The poppet valve 23 is reciprocated in an axial direction by arocker arm 25 which is engaged on the upper end of thevalve stem 23a, thereby supplying and exhausting a gas. 26 denotes a lip seal which is attached on the upper end of thevalve guide 22, so that excessive oil is not flowed into the contacting surface between thevalve stem 23a and thevalve guide 22. - In the conventional valve device, sufficient oil is supplied into the contacting surface through a gap between the
valve stem 23a and thelip seal 26 which is attached to the upper end of thevalve guide 22 so as to prevent wear of the contacting surface, thereby assuring smooth reciprocating motion of the poppet valve 23. - However, in the conventional valve device, supply of oil is changeable, so that oil is not uniformly spread over the
valve stem 23a in a circumferential direction, or supplied oil is likely to flow out through the lower end of thevalve guide 22. Thus, local wear occurs on the innercircumferential surface 22a of thevalve guide 22 or the outercircumferential surface 23c of thevalve stem 23a where oil is not sufficiently supplied. local wear causes noise during reciprocating motion of the valve 23 or concentrates oil to the portion of wear to solidify oil adhered to thevalve head 23b, thereby giving the engine bad effect. - To solve the disadvantages, there is provided a groove on the outer
circumferential surface 23c of thevalve stem 23a or the innercircumferential surface 22a of thevalve guide 22 to increase oil keeping capability, but such a groove decreases the strength and rigidity of thevalve stem 23a. - To overcome the disadvantages, it is an object of the present invention to provide a valve device in which oil is uniformly supplied over the whole contacting surface between a valve stem and a valve guide in proper quantities, thereby preventing local wear of the surface.
- According to the present invention, there is provided a poppet valve device comprising a valve which comprises a valve stem and a valve head; and a valve guide which is in a press fit with a cylinder head, the valve stem being slidably engaged in the valve guide, the valve being axially reciprocated by feeding and exhausting a gas in an internal combustion engine, on one of the outer circumferential surface of the valve stem and the inner circumferential surface of the valve guide, an annular or spiral groove being formed, porous material which has oil keeping capability being engaged in the groove.
- The porous material is provided in the annular or spiral groove on the valve stem or the valve guide, thereby maintaining oil which is flowed in through a gap between the valve stem and the valve guide. Owing to reciprocating motion of the poppet valve, maintained oil is uniformly supplied to the contacting surface between the valve guide and the valve stem in proper quantities. Thus, no local wear occurs on the outer circumferential surface of the valve stem or the inner circumferential surface of the valve guide, and no noise occurs during reciprocating motion of the valve. Also, it is prevented for oil to go down since oil is maintained. The porous material in the annular or spiral groove does not decrease strength and rigidity of the valve stem or valve guide.
- The features and advantages of the present invention will become more apparent based on the following description with respect to accompanying drawings wherein:
- Fig. 1 is a longitudinal sectional front view of the first embodiment of a valve device according to the present invention;
- Fig. 2 is a perspective view of one embodiment of porous material;
- Fig. 3 is a perspective view of another embodiment of the porous material;
- Fig. 4 is a longitudinal sectional front view of the second embodiment of the present invention; and
- Fig. 5 is a longitudinal sectional front view of a conventional valve device.
- As illustrated in Fig. 1, there are formed two
annular grooves 7 at the ends of the outer circumferential surface of a valve stem 3a of a valve 3, the outer circumferential surface of the valve stem 3a being slidably engaged in avalve guide 2. On theannular grooves 7, ring-shapedporous materials 8 partially cut out are tightly engaged, as shown in Fig. 2, the materials having oil keeping capability and elasticity. - To attach the
porous materials 8, theporous materials 8 elastically expanded may be engaged around theannular grooves 7 before the valve 3 is inserted in thevalve guide 2. After engagement, the outer diameter of theporous material 8 may be roughly equal to the outer diameter of the valve stem 3a. - As the
porous material 8, for example, powder metallurgical material, metal fiber felt, foamed metal and hard foam resin are suitable. - To provide the
porous material 8 around theannular groove 7, integral molding may be made, and the surface of theporous material 8 may be made to be equal to the outer diameter of the valve stem 3a by mechanical processing after molding. The porous material used in molding may include foam resin and porous ceramics. - By the construction as above, the
porous material 8 always maintains oil which comes through a gap between the lip seal and the valve stem 3a, and owing to reciprocating motion of the valve 3, maintained oil may be uniformly supplied onto the whole contacting surface between the valve stem 3a and thevalve guide 2 in proper quantities. - It is not likely to cause local wear of the outer
circumferential surface 3c of the valve stem 3a or the innercircumferential surface 2a of thevalve guide 2, and it is possible to reduce the amount of oil which is flowed out through the lower end of thevalve guide 2. Also, theporous materials 8 engaged on theannular grooves 7 does not decrease the strength and rigidity of the valve stem 3a. - Fig. 3 illustrates an embodiment in which a hard
porous plate 10 which has low specific gravity is fixed or engaged around the outer circumferential surface of an annularthin plate 9 made of spring steel etc. to form aporous material 11, thereby reducing weight of theporous material 11, so that increase in weight of the valve may be at minimum. - Without providing the hard porous
thin plate 10 having low specific gravity as above, porous material may be coated or porous phosphate or sulfuric acid coating may be formed on the outer circumferential surface of the annularthin plate 9. A number of pores may be formed in the annularthin plate 9. - The second embodiment will be described with respect to Fig. 4. The same numerals are allotted to the same members as those in the first embodiment, and its detailed description will be omitted. In the second embodiment, in the middle of the outer circumferential surface of a valve stem 3a of a valve 3 which is slidably engaged in a
valve guide 2, there is formed aspiral groove 12 on which spiralporous material - In the first and second embodiments, there are formed the
annular groove 7 orspiral groove 12 on which theporous material valve guide 2 on which porous material is attached. - The foregoings merely relate to embodiments of the present invention. Various modifications and changes may be made by person skilled in the art without scope of claims wherein:
Claims (5)
- A poppet valve device comprising:a valve which comprises a valve stem and a valve head; anda valve guide which is in a press fit with a cylinder head, the valve stem being slidably engaged in the valve guide, a gas being supplied and exhausted by reciprocating the valve axially in an internal combustion engine,on one of an outer circumferential surface of the valve stem and an inner circumferential surface of the valve guide, an annular or spiral groove being formed, porous material which has oil keeping capability being engaged in the groove.
- A poppet valve device as defined in claim 1 wherein the porous material is made of powder metallurgical material, metal fiber felt, foamed metal or hard foam resin.
- A poppet valve device as defined in claim 1 wherein the annular groove is formed on the outer circumferential surface of the valve stem.
- A poppet valve device as defined in claim 3 wherein the two annular grooves are formed adjacent to ends of the valve stem respectively on the outer circumferential surface of the valve stem.
- A poppet valve device as defined in claim 1 wherein the spiral groove is formed on the outer circumferential surface of the valve stem.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95401006A EP0745758A1 (en) | 1995-05-02 | 1995-05-02 | Poppet valve device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95401006A EP0745758A1 (en) | 1995-05-02 | 1995-05-02 | Poppet valve device |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0745758A1 true EP0745758A1 (en) | 1996-12-04 |
Family
ID=8221486
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95401006A Withdrawn EP0745758A1 (en) | 1995-05-02 | 1995-05-02 | Poppet valve device |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0745758A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1437485A1 (en) * | 2003-01-08 | 2004-07-14 | TRW Deutschland GmbH | Method of manufacturing an actuator with powder metallurgic position measuring means, and actuator |
US6911565B2 (en) | 2001-09-26 | 2005-06-28 | Danico Sweetners Oy | Process for the production of xylitol |
CN104632316A (en) * | 2013-11-13 | 2015-05-20 | 北京汽车动力总成有限公司 | Engine valve guide pipe and assembly |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB205849A (en) * | 1922-06-26 | 1923-10-26 | Thomas Andrew Lawrie | Improvements in valves of the mushroom type |
US2775024A (en) * | 1953-05-29 | 1956-12-25 | Thompson Prod Inc | Powder metal multi-ring bushing |
GB1076545A (en) * | 1965-02-26 | 1967-07-19 | Brico Eng | Internal combustion engine valve mechanisms |
US5062397A (en) * | 1990-09-07 | 1991-11-05 | Eaton Corporation | Valve stem seal |
EP0481763A1 (en) * | 1990-10-18 | 1992-04-22 | Hitachi Powdered Metals Co., Ltd. | Sintered metal parts and their production method |
-
1995
- 1995-05-02 EP EP95401006A patent/EP0745758A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB205849A (en) * | 1922-06-26 | 1923-10-26 | Thomas Andrew Lawrie | Improvements in valves of the mushroom type |
US2775024A (en) * | 1953-05-29 | 1956-12-25 | Thompson Prod Inc | Powder metal multi-ring bushing |
GB1076545A (en) * | 1965-02-26 | 1967-07-19 | Brico Eng | Internal combustion engine valve mechanisms |
US5062397A (en) * | 1990-09-07 | 1991-11-05 | Eaton Corporation | Valve stem seal |
EP0481763A1 (en) * | 1990-10-18 | 1992-04-22 | Hitachi Powdered Metals Co., Ltd. | Sintered metal parts and their production method |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6911565B2 (en) | 2001-09-26 | 2005-06-28 | Danico Sweetners Oy | Process for the production of xylitol |
EP1437485A1 (en) * | 2003-01-08 | 2004-07-14 | TRW Deutschland GmbH | Method of manufacturing an actuator with powder metallurgic position measuring means, and actuator |
CN104632316A (en) * | 2013-11-13 | 2015-05-20 | 北京汽车动力总成有限公司 | Engine valve guide pipe and assembly |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE ES FR GB IT |
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17P | Request for examination filed |
Effective date: 19970526 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19980401 |