WO1998057036A1 - Rotary cylinder radial piston engine - Google Patents
Rotary cylinder radial piston engine Download PDFInfo
- Publication number
- WO1998057036A1 WO1998057036A1 PCT/AU1998/000456 AU9800456W WO9857036A1 WO 1998057036 A1 WO1998057036 A1 WO 1998057036A1 AU 9800456 W AU9800456 W AU 9800456W WO 9857036 A1 WO9857036 A1 WO 9857036A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- assembly
- cylinder
- cylinders
- crankshaft
- inlet
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B57/00—Internal-combustion aspects of rotary engines in which the combusted gases displace one or more reciprocating pistons
- F02B57/08—Engines with star-shaped cylinder arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
- F02B75/18—Multi-cylinder engines
- F02B2075/1804—Number of cylinders
- F02B2075/182—Number of cylinders five
Definitions
- This invention relates to radial engines. This invention has particular but not exclusive application to spark ignition engines, and for illustrative purposes particular reference will be made to such application. However, it is to be understood that this invention could be used in other applications, such as fluid compressors or pumps which are embraced hereinafter by the term "engine”.
- Such engines will be referred to hereinafter as "the type described" .
- the present invention aims to provide improvements to the two and four stroke engines of the type described.
- this invention resides broadly in an engine assembly of the type described wherein the inner surface of said cylinder closure means about said cylinder assembly is a part-spherical surface and the outer surface surrounding each said cylinder lies in a common part- spherical plane operatively conforming to said part- spherical surface and wherein each said outer surface surrounding respective said cylinders supports radially spaced ring type seals which form a sliding seal between said outer surface surrounding each said cylinder and said part- spherical surface.
- the ring type seals are split- ring type seals.
- the ring type seals are metal seals.
- the engine assembly is configured as a spark ignition combustion engine having spark plug recesses in the cylinder closure which open to the cylinders to fully expose the spark plugs to the cylinders and wherein the radially spaced ring type seals are spaced so that they straddle the spark plug cylinder openings as they pass thereacross .
- substantially unrestricted access to the cylinders for admission of air/fuel mixture to the spark plugs contained therein is provided ensuring effective ignition and conditioning of the spark plug, one of the prime requirements for maximum performance operation while the radial spacing of the ring type seals prevents the formation of a gas bleed path as occurs with a single ring type seal when it is disposed across the spark plug opening, the gas being able to travel up and over the seal through the plug recess.
- the outer surface surrounding respective said cylinders supports a pair of concentrically spaced apart ring type seals which form a sliding seal between said outer surface surrounding each said cylinder and said part- spherical surface.
- the spacing between each pair of ring type seals is greater than the diameter of said spark plug recesses.
- the ring type seals are supported in respective recesses having a depth greater than the height of the ring type seal accommodated therein.
- the ring type seals are biased by rotational forces into operative engagement with the spherical cylinder closure surface however it is preferred that at least one of said ring seals about each cylinder includes a base spring which engages the base of its accommodating recess and urges the ring type seal outwardly beyond its accommodating recess. This arrangement will assist in sealing, particularly during start-up when good compression from cold is required at very low revs.
- this invention resides in an engine assembly including:- a crankcase assembly; a crankshaft assembly supported by said crankcase assembly; a cylinder assembly rotatable relative to said crankcase assembly about said crankshaft assembly, said cylinder assembly having an uneven number of cylinders disposed radially about the crankshaft assembly and with their axes co-planar; respective piston assemblies connected to said crankshaft assembly for operation within said cylinders; cylinder closure means supported fixedly by said crankcase assembly for closing said cylinders and having an operatively continuous inner closure surface sealably and slidably engaged with the cylinders; inlet and outlet ports through said inner closure surface through which fluid may be cyclically introduced into or expelled from said cylinders, the inlet and outlet ports being grouped in pairs of circumferentially spaced inlet and exhaust ports, and wherein said exhaust ports are angled from the radial direction in the direction of rotation of the cylinder assembly.
- the exhaust ports suitably diverge at an angle of between thirty and sixty degrees from the radial direction and more preferably at about forty-five degrees from the radial direction.
- the exhaust port may emerge from the cylinder closure means from the outer surface thereof but preferably the exhausts ports emerge through a common or respective side wall portion of the cylinder closure means.
- the inlet ports include a substantially centrally disposed primary port utilised for low speed operation and a secondary port disposed at one side of said primary port and opened for high speed operation and wherein the exhaust tract in said cylinder closure means between its opening to the cylinder and its opening through said side wall portion extends past said primary port at the opposite side thereof to said secondary port.
- the engines of this invention are of the type described but this invention is not limited to engines as devised by the present inventor and may be advantageously used in other similar engines as listed in the prior art statement of my US patent No. 5,524,577.
- FIG. 1 is a diagrammatic end view of an embodiment of a five cylinder four-stroke radial engine according to the present invention
- FIG. 1A is a partial sectional view of the part of the embodiment of Fig. 1 further illustrating the inlet port configuration
- FIG. IB is a diagrammatic illustration of the inlet ports of the embodiment of Fig. 1;
- FIG. 2 is a diagrammatic transverse sectional view through the engine illustrated in FIG. 1;
- FIG. 3 is an enlarged end view showing details of the cylinder sealing and spark plug arrangement
- FIG. 4 is an enlarged diagrammatic transverse sectional view taken along the line 4-4 of Fig. 14
- FIG. 5 illustrates further details of a preferred form of cylinder sealing
- FIG. 7, 7A and 7B correspond to Figs. 6 but illustrate a relatively short central primary inlet port
- FIG. 8, 8A and 8B correspond to Figs. 6 but illustrate an exhaust port crossing the inlet ports
- FIG. 9, 9A and 9B correspond to Figs. 6 but illustrate a an arrangement wherein the ports exit from opposite sides of the cylinder closure means.
- the recesses 11 are longer than the screw-in portions of the spark plugs as any protrusion beyond this surface would trap the ring seals 16.
- the respective openings to the cylinder surface correspond to the width of the recesses 11.
- the radially spaced split-ring type seals 16 are spaced apart a distance greater than the outside diameter of the plug recesses 11 so that the recesses 11 are only exposed to one seals 16 at a time and thus preventing the plug recess acting as a bypass passage across the ring seals 16.
- the rotary cylinder assembly 13 has an axial length at its interface with the cylinder closure assembly 14 whereby lands are formed around the cylinders of sufficient width to accommodate the concentrically disposed widely spaced seals 16. If desired one or more further concentric split-ring type seals could be provided between the widely spaced seals 16. This arrangement is clearly illustrated in Figs. 3 and 4.
- each split-ring type seal 16 is located in a respective groove 17 and is resiliently urged beyond the open end thereof by a coarsely coiled spring 18.
- a wavey flat spring may be equally used.
- the coil spring could be formed of thin spring steel wire of about ten thousandth of an inch diameter and having four coils in its length which is approximately equal to the circumference of the recess.
- the inlet ports comprise a central short primary port 26 controlled by the butterfly valve 27 and outer long secondary ports 28 controlled by the butterfly valve 29.
- the exhaust ports 20 are angled from the radial direction in the direction of rotation of the rotary cylinder assembly 13 and suitably the exhaust ports 20 diverge at about forty-five degrees from the radial direction.
- This configuration aims to take advantage of the radial component of motion of the exhaust gases relative to the cylinder axis, wherein at the interface between the cylinder closure assembly 14 and the rotary cylinder assembly 13, the tangential speed imparted to combustion gases by rotation of the rotary cylinder assembly 13 is greater than the radial speed imparted thereto by the reciprocating pistons.
- the outer edge 21 of the rotary cylinder assembly 13 is recessed to provide a sealing land 22 for conventional lip-type seals 23 retained in the cylinder closure assembly 14.
- This recess also provides a location shoulder 24 terminating the part spherical shape of the outer surface 25.
- Peripheral radial engagement sealing of the cylinder is preferred so that oil clearances on bearing surfaces, which may result in a slight wobbling of the rotating cylinder do not cause cyclic distortion of the lip-type seals 23 such that they will become inoperative or significantly increase their frictional restraint on the free rotation of the cylinder assembly.
- the secondary port 30 is centrally disposed and is much longer than the primary ports 31. This enables the number of butterfly valves to be limited to two, comprising a single central valve 33 for the secondary port and a further single butterfly valve 34 controlling the primary inlet as well as the flow to the secondary port.
- the embodiment illustrated in Figs. 7 is similar to the embodiment illustrated in Fig. 1. It has the advantage that as the secondary ports 40, together with their butterfly valve 41 and the primary port 42 are supplied from a common tract 43 controlled by a butterfly valve 44. Thus a single fuel injector in the tract 43 will supply all ports, whereas the Fig.
- FIG. 1 embodiment would be more suited to a dual-throat carburetor mounted above the primary and secondary butterflies 27 and 29 supported in the inlet manifold 36 adjacent its entrance 37.
- Figs. 8 also illustrate inlet manifolds 50 and exhaust manifolds 51 mounted on the periphery of the cylinder closure 52.
- the inlet ports comprise a short primary port 53 to one side of the cylinders 54 and a large long secondary port 55 at the other side of the cylinders.
- Both the inlet ports 53 and 55 deflect to one side of the engine axis to provide room for the adjacent exhaust manifold portion 56 to pass with minimum deflection in the exhaust passage while maintaining a compact overall configuration.
- Butterfly valves 55 and 56 control the primary and secondary ports respectively.
- the inlet ports 60 and the exhaust ports 61 are cast integrally into the cylinder closure assembly whereby they exit from respective opposite side faces 62 and 63 of the cylinder closure assembly 64.
- This enables the inlet and outlet manifolds to be maintained within the boundary surrounding the cylinder closure assembly 64 where required to suit installation space requirements.
- the cast in manifolds should also simplify manufacture.
- the exhaust port 65 has a narrow leading portion 66 which extends to a substantially rectangular main part 67.
- This arrangement enables a initial exhaust flow to commence from the cylinders 68 through the exhaust port without providing the sudden pressure loss provided by a simple rectangular port. It is considered that this will benefit low speed performance.
- Concave piston crowns are retained because of the ease of varying the compression ratio by changing pistons only and to act synergistically with a substantial centrally disposed inlet port. It is considered that as the concave piston passes across the inlet ports, the relative tangential movement imparts a swirling action generated about an axis parallel to the crankshaft axis and in a direction which enhances exhausting through the angled exhaust ports.
- substantially centrally disposed inlet port may be used, however it is preferred that the inlet ports have a central port and at least one offset port.
- the substantially centrally disposed . inlet ports and the offset ports suitably provide independent primary and secondary feeds to the cylinders.
- each cylinder may communicate with a single inlet port or multiple inlet ports which may serve only to increase the port area or to provide differences in communication duration on each pass.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU80038/98A AU8003898A (en) | 1997-06-12 | 1998-06-12 | Rotary cylinder radial piston engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US87412397A | 1997-06-12 | 1997-06-12 | |
US08/874,123 | 1997-06-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998057036A1 true WO1998057036A1 (en) | 1998-12-17 |
Family
ID=25363028
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU1998/000456 WO1998057036A1 (en) | 1997-06-12 | 1998-06-12 | Rotary cylinder radial piston engine |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU8003898A (en) |
WO (1) | WO1998057036A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999024696A1 (en) * | 1997-11-12 | 1999-05-20 | Gemtech Corporation Limited | Radial motor/pump |
JP2013155664A (en) * | 2012-01-30 | 2013-08-15 | Ito Racing Service Co Ltd | Rotary engine |
ITMO20120051A1 (en) * | 2012-03-01 | 2013-09-02 | Adriana Bertacchini | ENDOTHERMAL ENGINE PERFECTED WITH REDUCED DIMENSIONS. |
WO2013189471A1 (en) * | 2012-06-21 | 2013-12-27 | Knob Engines S.R.O. | Seal assembly for rotary piston internal combustion engine |
CN109798184A (en) * | 2019-03-04 | 2019-05-24 | 李振中 | Multi-cylinder axis puts internal combustion engine |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2243608A5 (en) * | 1973-09-06 | 1975-04-04 | Peugeot & Renault | I.C. engine with radial rotating pistons - crankshaft/rotor speed ratio is equal to number of cylinders |
DE2732779A1 (en) * | 1977-07-20 | 1979-02-08 | Froese Ruediger | Rotary cylinder piston engine - has radial cylinders in cylindrical block rotating inside casing and ring seals around cylinder tops |
DE3237378A1 (en) * | 1982-10-08 | 1984-04-12 | Werner 7000 Stuttgart Vieth | Rotary sleeve combustion engine |
WO1988008483A1 (en) * | 1987-04-30 | 1988-11-03 | Josef Gail | Planetary piston internal combustion engine |
WO1993019284A1 (en) * | 1992-03-16 | 1993-09-30 | Clifford Colin A | Rotary engine |
-
1998
- 1998-06-12 AU AU80038/98A patent/AU8003898A/en not_active Abandoned
- 1998-06-12 WO PCT/AU1998/000456 patent/WO1998057036A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2243608A5 (en) * | 1973-09-06 | 1975-04-04 | Peugeot & Renault | I.C. engine with radial rotating pistons - crankshaft/rotor speed ratio is equal to number of cylinders |
DE2732779A1 (en) * | 1977-07-20 | 1979-02-08 | Froese Ruediger | Rotary cylinder piston engine - has radial cylinders in cylindrical block rotating inside casing and ring seals around cylinder tops |
DE3237378A1 (en) * | 1982-10-08 | 1984-04-12 | Werner 7000 Stuttgart Vieth | Rotary sleeve combustion engine |
WO1988008483A1 (en) * | 1987-04-30 | 1988-11-03 | Josef Gail | Planetary piston internal combustion engine |
WO1993019284A1 (en) * | 1992-03-16 | 1993-09-30 | Clifford Colin A | Rotary engine |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999024696A1 (en) * | 1997-11-12 | 1999-05-20 | Gemtech Corporation Limited | Radial motor/pump |
JP2013155664A (en) * | 2012-01-30 | 2013-08-15 | Ito Racing Service Co Ltd | Rotary engine |
ITMO20120051A1 (en) * | 2012-03-01 | 2013-09-02 | Adriana Bertacchini | ENDOTHERMAL ENGINE PERFECTED WITH REDUCED DIMENSIONS. |
WO2013189471A1 (en) * | 2012-06-21 | 2013-12-27 | Knob Engines S.R.O. | Seal assembly for rotary piston internal combustion engine |
US9366200B2 (en) | 2012-06-21 | 2016-06-14 | Knob Engines S.R.O. | Seal assembly for rotary-piston internal-combustion engine |
EA030441B1 (en) * | 2012-06-21 | 2018-08-31 | Кноб Енгинес С.Р.О. | Seal assembly for rotary piston internal combustion engine |
CN109798184A (en) * | 2019-03-04 | 2019-05-24 | 李振中 | Multi-cylinder axis puts internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
AU8003898A (en) | 1998-12-30 |
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