GB2041443A - IC engine poppet valves - Google Patents
IC engine poppet valves Download PDFInfo
- Publication number
- GB2041443A GB2041443A GB7903998A GB7903998A GB2041443A GB 2041443 A GB2041443 A GB 2041443A GB 7903998 A GB7903998 A GB 7903998A GB 7903998 A GB7903998 A GB 7903998A GB 2041443 A GB2041443 A GB 2041443A
- Authority
- GB
- United Kingdom
- Prior art keywords
- head
- vanes
- valve
- stem
- internal combustion
- 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- Withdrawn
Links
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
- F01L3/06—Valve members or valve-seats with means for guiding or deflecting the medium controlled thereby, e.g. producing a rotary motion of the drawn-in cylinder charge
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
A plurality of vanes 20 extending from the rear surface of the valve head are each of substantially uniform thickness and interconnect the stem and the head, the ratio of the circumferential thickness of the vanes at radial positions towards the edge of the head to the circumferential length of the head at the same positions being not less than 1:8. The vanes act as heat emission surfaces in exhaust valves, and are shaped to produce turbulence in the combustion chamber of an engine when incorporated in an inlet valve. <IMAGE>
Description
SPECIFICATION
Valve for internal combustion engine
This invention relates to valves for internal combustion engines.
German Patent Publication No. 2622546 discloses a valve for an internal combustion engine comprising a generally disc-shaped head, a stem extending axially from a rear surface of the head, and a plurality of vanes mounted on the rear surface of the head.
These vanes are in the form of a cage positioned adjacent the peripheral edge of the head, the individual vanes being inclined to the radii of the head at the point at which they are attached. In use, the valve is installed in an inlet to a cylinder of an internal combustion engine, and the cage co-operates with the walls of the inlet to direct the flow of air and fuel into the cylinder in a swirling path so that good mixing of the fuel and air is obtained in the cylinder prior to combustion.
According to the present invention there is provided a valve for an internal combustion engine comprising a generally disc-shaped head, a stem extending axially from a rear surface of the head, and a plurality of vanes mounted on the rear surface of the head, characterised in that each vane interconnects the stem and the head, and in that the ratio of the total circumferential thicknesses of the vanes at radial positions towards the edge of the head to the circumferential length of the head at the same positions is not less than 1:8, and is preferably 1:10 or higher.
The valve may be used in an inlet port or an exhaust port of an internal combustion engine. When the valve is intended for use in an exhaust port, the vanes act as heat emitting surfaces and therefore prevent over-heating of the valve. In such valves the vanes may extend radially along axial planes.
Preferably, the valve is used in an inlet valve of an internal combustion engine, and the vanes are so shaped that gas flowing along the stem towards the head is deflected tangentially by the vanes, thus generating a swirling flow of gas in the combustion chamber of the engine.
By selecting the thicknesses of the vanes to fall within the specified limits the vanes do not block or hinder the passage of gasses through the inlet or outlet to the same degree as the cage construction described in the
German Patent Publication discussed previously. The mixing of the gases, or the cooling of the valve, is therefore improved without impairing the bulk flow properties of the inlet valve.
Preferably, the valve carries no more than eight, and desirably, no more than six, vanes.
Each vane will usually be helical in plan and desirably all the vanes are of uniform thickness. The gas flow may be further improved by using blades which have "shell' configuration, i.e. which are concavo-convex in the circumferential direction.
A preferred embodiment of the invention will now be described, by way of example only, with reference to the drawings, in which:
Figure 1 is a vertical cross section through part of an internal combustion engine incorporating a valve in accordance with the invention;
Figure 2 is a horizontal cross section through the valve of Fig. 1 taken along Ine
X-X; and
Figure 3 is an underneath view of the apparatus shown in Fig. 1.
Referring to the drawings, an internal combustion engine comprises a cylinder block 1 and a cylinder head 2, both of which are of conventional construction. The cylinder block 1 defines a cylinder 2 into which a mixture of air and fuel is admitted from an induction tract 4 in the cylinder head 2 via an inlet 5 in which is mounted a valve seat 5'. Combustion products are exhausted from the cylinder 3 through an exhaust valve 6 (Fig. 3) of conventional construction. The flow of the mixture through the inlet 5 is controlled by a valve 10 which is reciprocably mounted in a valve guide 11 in the cylinder head 2.The valve 10 comprises a stem 1 2 which is attached at one end to a collar 1 3. A compression spring 14 acts between the collar 1 3 and the cylinder head 2 to bias the valve 10 upwardly, into a closed position. The other end of the stem 1 2 is attached to the rear surface 14 of a generally disc-shaped head 1 5 which sealingly engages the inlet 5 when the valve is in its closed position (as indicated by broken lines in Fig. 1).
The rear surface 1 4 of the head of the valve 10 carries six vanes 20 which each interconnect the rear surface 1 4 and the stem 1 2.
Each vane is of uniform thickness and, as seen from Fig. 2, extends generally helically radially away from the stem 1 2 towards the edge of the head 1 5. Each vane terminates short of the edge of the head 1 5 so that the valve can be withdrawn into the inlet 5 to effect sealing engagement between the valve seat 5' and the head 15.
Each vane 20 is manufactured from relatively thin sheet material so that, at any radial point towards the edge of the rear surface 1 4 of the head 15, the total circumferential thicknesses of the vanes is less than one eighty of the circumferential length of the head at that point. For example, where the vanes 20 are formed from metal having a thickness of 1 mm, and the head 1 5 is 28 mm in diameter, the total circumferential thicknesses of the vanes 20 at the point A, 4 mm inwardly from the edge of the head 15, will be 6 mm. The circumferential length of the head at this point will be sr X 20 mm or 62.88 mm.The ratio of the total circumferential thicknesses of the vanes to the circumferential length of the head at this point will therefore be 6:62.8, or about 1:10.5. The vanes 20 may be mounted on the valve 10 by welding, brazing or forging. Alternatively, the vanes 20 may be formed integrally with the head 1 5 by machinning, forging or casting. In an alternative embodiment (not shown) the blades are connected to a central ring which is formed separately from the valve stem and the head, and which is then secured to the stem by a welding or brazing operation.
In use, the valve is opened during each induction stroke of the engine and air is drawn into the cylinder through the induction tract 4 in the direction of the arrow B in Fig.
1 when the air impinges upon the vanes 20, it is deflected from its generally axial flow path into a swirling flow path indicated by the arrows C in Figs. 2 and 3. This increases the turbulence in the cylinder 3 and improves the uniformity of the mixture in the cylinder 3 prior to combustion, thereby improving combustion.
The vanes also provide heat emitting surfaces and thereby assist in preventing overheating of the valve. Additionally, the reaction of the air against the vanes will provide a small rotational force on the valve and will assist the normal rotation of the valve in the valve guide under the influence of mechanical forces applied to the valve by the opening mechanism (not shown).
Claims (6)
1. A valve for an internal combustion engine comprising a generally disc-shaped head, a stem extending axially from a rear surface of the head, and a plurality of vanes mounted on the rear surface of the head, characterised in that each vane is of substantially uniform thickness and interconnects the stem and the head and in that the ratio of the circumferential thickness of the vanes at radial positions towards the edge of the head to the circumferential length of the head at the same positions is not less than 1:8.
2. A valve according to claim 1 wherein the vanes are so shaped that gas flowing along the stem towards the head is deflected tangentially by the vanes.
3. A vane according to claim 1 or claim 2 wherein the said ratio is not less than 1:1 0.
4. A valve according to anyone of claims 1 to 3 wherein the vanes are no more than 8 in number.
5. A valve for an internal combustion engine substantially as hereinbefore described, and as illustrated in the drawings.
6. An internal combustion engine incorporating one or more valves according to any one of claims 1 to 5 in each of its cylinders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7903998A GB2041443A (en) | 1979-02-05 | 1979-02-05 | IC engine poppet valves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7903998A GB2041443A (en) | 1979-02-05 | 1979-02-05 | IC engine poppet valves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2041443A true GB2041443A (en) | 1980-09-10 |
Family
ID=10502971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7903998A Withdrawn GB2041443A (en) | 1979-02-05 | 1979-02-05 | IC engine poppet valves |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2041443A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4320725A (en) * | 1980-02-25 | 1982-03-23 | Rychlik Frank J | Puffing swirler |
| US4354463A (en) * | 1979-06-09 | 1982-10-19 | Honda Giken Kogyo Kabushiki Kaisha | Device for improving combustion efficiency of mixture in four cycle internal combustion engine |
| DE3312640A1 (en) * | 1983-04-08 | 1984-10-11 | Schmidt, Walter, 1000 Berlin | Cylinder head with gas control valve for four-stroke internal combustion engine |
| US4539954A (en) * | 1984-10-29 | 1985-09-10 | General Motors Corporation | Selective asymmetric swirl intake port |
| US4744340A (en) * | 1985-07-17 | 1988-05-17 | Kirby Ronald A | Vortex generator intake valve and system of using the same |
| US4995349A (en) * | 1988-02-08 | 1991-02-26 | Walbro Corporation | Stratified air scavenging in two-stroke engine |
| US5301640A (en) * | 1993-05-24 | 1994-04-12 | Barranco Jr Joseph M | Engine valve |
| DE19512058A1 (en) * | 1995-03-31 | 1995-09-28 | Ehrenfried Debus | Swirling flow inlet valve for combustion engine |
| US5485815A (en) * | 1993-11-25 | 1996-01-23 | Fuji Oozx Inc. | Poppet valve device |
| DE102014219917A1 (en) | 2014-10-01 | 2016-04-07 | Mahle International Gmbh | Eddy current valve |
| CN106224046A (en) * | 2016-07-22 | 2016-12-14 | 山东大学 | Produce band spiral fluted inlet valve and the internal combustion engine of intake swirl |
-
1979
- 1979-02-05 GB GB7903998A patent/GB2041443A/en not_active Withdrawn
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4354463A (en) * | 1979-06-09 | 1982-10-19 | Honda Giken Kogyo Kabushiki Kaisha | Device for improving combustion efficiency of mixture in four cycle internal combustion engine |
| US4320725A (en) * | 1980-02-25 | 1982-03-23 | Rychlik Frank J | Puffing swirler |
| DE3312640A1 (en) * | 1983-04-08 | 1984-10-11 | Schmidt, Walter, 1000 Berlin | Cylinder head with gas control valve for four-stroke internal combustion engine |
| US4539954A (en) * | 1984-10-29 | 1985-09-10 | General Motors Corporation | Selective asymmetric swirl intake port |
| US4744340A (en) * | 1985-07-17 | 1988-05-17 | Kirby Ronald A | Vortex generator intake valve and system of using the same |
| US4995349A (en) * | 1988-02-08 | 1991-02-26 | Walbro Corporation | Stratified air scavenging in two-stroke engine |
| US5301640A (en) * | 1993-05-24 | 1994-04-12 | Barranco Jr Joseph M | Engine valve |
| US5485815A (en) * | 1993-11-25 | 1996-01-23 | Fuji Oozx Inc. | Poppet valve device |
| DE19512058A1 (en) * | 1995-03-31 | 1995-09-28 | Ehrenfried Debus | Swirling flow inlet valve for combustion engine |
| DE102014219917A1 (en) | 2014-10-01 | 2016-04-07 | Mahle International Gmbh | Eddy current valve |
| CN106224046A (en) * | 2016-07-22 | 2016-12-14 | 山东大学 | Produce band spiral fluted inlet valve and the internal combustion engine of intake swirl |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |