WO1995022689A1 - A valve system in a rotary radial-piston engine - Google Patents
A valve system in a rotary radial-piston engine Download PDFInfo
- Publication number
- WO1995022689A1 WO1995022689A1 PCT/SE1995/000149 SE9500149W WO9522689A1 WO 1995022689 A1 WO1995022689 A1 WO 1995022689A1 SE 9500149 W SE9500149 W SE 9500149W WO 9522689 A1 WO9522689 A1 WO 9522689A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ring
- valve
- hub
- recesses
- housing
- Prior art date
Links
- 238000002485 combustion reaction Methods 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 4
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- F01L7/00—Rotary or oscillatory slide valve-gear or valve arrangements
- F01L7/06—Rotary or oscillatory slide valve-gear or valve arrangements with disc type valves
-
- 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
-
- 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
- F02B1/00—Engines characterised by fuel-air mixture compression
- F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
- F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
-
- 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
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
-
- 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
- F02B2075/1816—Number of cylinders four
Definitions
- the subject invention concerns a valve system in accordance with the preamble of claim 1.
- a four-stroke radial piston engine comprising a stationary housing, a drive shaft which is rotationally mounted essentially centrally inside said housing and which supports a hub rotating therewith, radially projecting cylinders which are mounted on the hub to co-rotate therewith, said cylinders being positioned inside a circumferentially extending chamber in said housing and each cylinder having a piston which is mounted for radial reciprocating movement inside its associated cylinder, the piston heads of said pistons facing radially inwards towards the hub, a circumferent ⁇ ially extending cam member mounted inside the housing in alignment with the pistons adjacent the radially outwardly extending piston ends and having a cam face facing said pistons, against which cam face abut bearing means mounted on each piston in order to impart a radial movement to said pistons in the direction towards the hub upon rotation relatively to the stationary housing of the rotary unit formed by the pistons, the cylinders, the hub, and the drive shaft, and a combustion chamber formed in
- the main purpose of the invention is to further develop the valve device in such a manner that this drawback will be eliminated.
- This problem is solved in accordance with the teachings of the invention in that at least one of the two faces in sliding contact with each other on respectively the valve ring and the port ring is provided with recesses that are distributed across said face.
- Fig. 1 is a longitudinal sectional median view through a prior-art engine.
- Fig. 2 is a perspective explosive view showing the various components incorporated in the valve system of Fig. 1.
- Figs. 3A and 3B are respectively a front view and a sectional view along line 3-3 in Fig. 3A of details of an ignition system incorporated in the engine in accordance with Fig. 1.
- Figs. 4A - 7B are transverse and lengthwise sectional views showing the four cycles of the engine of Fig. 1 and the positions of the various components during these cycles, and
- Fig. ' 8 illustrates in a manner corresponding to Fig. 2 a valve system in accordance with the invention in a perspective view.
- the engine illustrated in the drawings is a four- stroke internal combustion engine pertaining to the group of multiple cylinder radial-piston engines.
- the internal combustion engine is indicated generally by numeral reference 1 and it comprises a stationary, essentially rotationally symmetrical or annular housing 2.
- the stationary housing 2 is made from a suitable material, such as cast iron or light metal and it consist of two halves or housing parts 3 and 4, which are held together by means of bolts 5 spaced circumferentially adjacent the external periphery of the housing.
- a peripheral seal 6, such as an 0-ring preferably is provided.
- housing part 3 On one of the parts of the stationary housing 2, in accordance with the shown embodiment housing part 3, is by means of bolts 7 securely anchored a connecting collar 8 having a central through-opening 9 for reception therein of a drive shaft 10 which is mounted for rotary motion essentially in the centre of the housing 2.
- a hub 11 which co-rotates with the drive shaft 10 is secured on the drive shaft by means of a centre bolt 12 and is formed with axially extending, sleeve-like extensions 13.
- the rotary unit formed by the drive shaft 10, the hub 11, the cylinders 14, and the pistons 16 is rotationally mounted inside the stationary housing 2 and in the connecting collar 8 by means of roller bearings 42, 43, 44, two of said bearings, viz. bearings 42, 43, being positioned between the sleeve-like extensions 13 of the hub 11 and the stationary housing 2 whereas the third bearing 44 is positioned between the drive shaft 10 and the connecting collar 8 adjacent the free projecting end of the shaft 10 to which end a power take-off means may be connected.
- the bearings 42, 43 may be provided with suitable seal rings 45 positioned axially externally thereof.
- Radially projecting cylinders 14, of which four are provided in accordance with the embodiment illustrated in the drawings, are non-rotationally mounted on the hub 11 so as to rotate together with the latter. All cylinders 14 are positioned inside a circumferentially extending chamber 15 in the stationary housing 2, i.e. a chamber defined by housing parts 3 and 4. Each cylinder 14 receives its associated piston 16 for reciprocating movement radially therein, said pistons 16 being of an essentially conventional configuration including piston heads 17 and sealing rings 18, the piston heads facing radially inwards, towards the hub 11.
- a circumferentially extending cam member 19 the cam face 20 of which faces the pistons 16 is mounted inside the stationary housing 2 opposite the pistons 16 at the radially outwardly projecting piston ends 21. More specifically, the circumferential cam member 19 is inserted in recesses formed in opposite faces in the housing parts 3 and 4 with the cam member secured in position by means of the same bolts 5 as those which hold the housing parts 3 och 4 together.
- the cam face 20, as indicated e.g. in Fig. 4A is essentially of elliptical configura ⁇ tion. However, the configuration of the cam surface may vary in dependence of the number of cylinders used.
- each piston 16 supports a bearing 23, which in accordance with the illustrated embodiment is a cylindrical roller bearing the outer ring 24 of which rolls in abutment against the cam face 20 in order to impart a radial motion to the pistons 16 in a direction towards the hub 11, when the rotary unit formed by the pistons 16, the cylinders 14, the hub 11, and the drive shaft 10 rotates relatively to the stationary housing 2.
- a bearing 23 which in accordance with the illustrated embodiment is a cylindrical roller bearing the outer ring 24 of which rolls in abutment against the cam face 20 in order to impart a radial motion to the pistons 16 in a direction towards the hub 11, when the rotary unit formed by the pistons 16, the cylinders 14, the hub 11, and the drive shaft 10 rotates relatively to the stationary housing 2.
- the pistons 16 are impar t ed a radial movement in the direction away from the hub . in response to the pressure increase resulting from the combustion and the centrifugal force acting on the pistons.
- each combustion chamber 25 are common and they are formed axially in a valve ring 28 which rotates together with the hub 11 and which is essentially concentric with the latter, see particularly Fig. 2.
- the valve ring 28 abuts flatly and by means of compression springs 29 it is yieldingly pressed into sealing abutment against a port ring 30 and it supports sealing rings 31 around its inlets and outlets 26, 27, respectively.
- the inlets and outlets 26, 27 in the valve ring 28 ar prolonged axially in th. form of sleeves 32 so as to extend outwardly from the valve ring 28.
- the sleeves 32 support the sealing rings 31 and project into correspond ⁇ ing recesses 33 formed in the the hub 11 to ensure securement and displacement of the valve ring.
- the port ring 30 is essentially concentric with the valve ring 28 and it is rigidly connected to the stationary housing 2. More precisely, by means of bolts, not shown, it is mounted on the inner end of the connec ⁇ tion collar 8 which is turned towards the combustion chambers 25.
- the port ring 30 is formed with axial intake and exhaust ports 36 and 37, respectively, communicating with inlet and outlet ducts 34 and 35, respectively, in the connection collar 8.
- the intake and exhaust ports 36, 37 are arranged, upon rotation of the rotary unit 10, 11, 14 and 16 relatively to the stationary housing 2, alternatingly to assume a position in registry with the inlets and outlets 26 and 27 formed in the valve ring 28 and associated with their respective combustion chamber 25.
- the inlet and outlet ducts 34 and 35, respectively, formed in the connection collar 8 debouch at one of their ends axially opposite the intake and exhaust ports 36 and 37, respectively, in the port ring 30 and at their opposite ends they are connected respectively to an intake system, such as a carburetter 38 or an injection system, see Fig. 1, and to an exhaust system 39, see Fig. 7B.
- an intake system such as a carburetter 38 or an injection system, see Fig. 1
- an exhaust system 39 see Fig. 7B.
- an inlet pipe 40 into which debouches a channel 41 which communicates with the circumferential chamber 15 of the stationary housing 2 for the purpose of generating a negative pressure inside the chamber 15 so as to suck out any blow-by exhaust gases and, at least during conditions of low rotational speed of the engine, facilitate the radial movement outwards of the pistons 16.
- the radial-piston engine in accordance with the invention is also provided with one spark plug 46 for each combustion chamber 25, i.e. four spark plugs in accordance with the embodiment illustrated. These spark plugs are screwed essentially axially into the hub 11 at the end remote from the valve ring 28 and thus they rotate together with the hub. The electrode end of each spark plug 46 consequently projects into the associated one of the combustion chambers 25 essentially opposite the common intake and outlet 26 and 27 in the valve ring 28.
- the spark plugs 46 are associated with an ignition distributor, generally designated by reference 47.
- the latter comprises electrodes 49 which are arranged to rotate together with the rotary unit 10, 11, 14, 16 and which are spring actuated by means of helical compression springs 48 into engagement with their respective one of the connective spark plug ends.
- Each electrode has a radially projecting contact 50 which is fastened to its associated electrode, preferably by screwing, and the contacts are arranged to sequentially move past a stationary electrode 51 which in turn is coupled to a source of ignition current, not shown in detail.
- the rotating electrodes 49 and their associated contacts are disposed in recesses 52 in a hub-like holder 53 which is secured to the drive shaft 10 by means of the earlier mentioned centre bolt 12.
- the stationary electrode 51 is preferably arranged radially in an annular fastener 55 which is secured to the housing 2 by means of bolts 54.
- two circumferentially extending return cam members 56 are mounted in the circumferentially extending chamber 15 of the stationary housing 2 in accordance with the embodiment illustrated, said return cam members being positioned one on either side of the pistons 16 and radially interiorly of the cam members 19.
- the circumferentially extending cam members 56 have one radially outwardly facing cam face 57 each, with a configuration essentially matching that of cam face 20 on cam member 19.
- Two return pins 58 projecting in opposite axial directions on each piston 16 are arranged to be moved into abutment against the cam surfaces 57 of the return cam members 56 in order to, as previously mentioned, urge the pistons radially outwards while pre ⁇ venting them from assuming an oblique position inside their associated one of the cylinders 14.
- the radial-piston engine in accordance with the invention is fitted with a water cooling system and a lubricating system but since these systems form no part of the invention as such they are not described further herein.
- the radial-piston engine as shown and described comprises four cylinders but there is nothing to prevent this number to be reduced to at least two or increased to perhaps six or more cylinders.
- piston I is in position to begin the suction/intake of the fuel-air mixture while piston II is in position to ignite the compressed fuel-air mixture.
- Figs. 5A and 5B show the suction phase (suction stroke) of piston I and the expansion phase (working stroke) of piston II.
- piston I is about to begin the compression and piston II is about to begin the exhaust stroke.
- Figs. 7A and 7B finally, show piston I in the compression phase (compression stroke) and piston II in the exhaustion phase (exhaust stroke).
- All four pistons 16 sequentially travel through all four strokes or cycles during one revolution of the rotary unit 10, 11, 14 and 16.
- valve system in accordance with the invention illustrated in Fig. 8 is distingushed from the valve system shown in Fig. 2 essentially in that the face of the valve ring 128 that is turned against and in sliding contact with the port ring 130 is recesses 128a which are distributed over the entire ring face.
- the recesses are arranged in a pattern of squares including rib-like protrusions 128b positioned intermediate the recesses and the crests of which form the valve ring plane sliding against the port ring.
- the plane-defining protrusions could be curved in an arcuate as well as in an irregular pattern.
- this embodiment according to Fig. 7 is distinguished from that according to Fig. 2 in that the sealing rings 131 are of an "expanding piston-ring" type and they are received in peripheral grooves 132a formed in the sleeve-like protrusions on the valve ring 128. Otherwise the components according to Fig. 8 corresponding to similar components in the embodiment in accordance with Fig. 2 have been given the same numeral reference with the addition of 100.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7521749A JPH09512873A (en) | 1994-02-17 | 1995-02-14 | Rotating radial-piston engine valve system |
US08/693,066 US5671702A (en) | 1994-02-17 | 1995-02-14 | Valve system in a rotary radial-piston engine |
EP95910049A EP0832348A1 (en) | 1994-02-17 | 1995-02-14 | A valve system in a rotary radial-piston engine |
AU18286/95A AU1828695A (en) | 1994-02-17 | 1995-02-14 | A valve system in a rotary radial-piston engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9400536-0 | 1994-02-17 | ||
SE9400536A SE502425C2 (en) | 1994-02-17 | 1994-02-17 | Valve system for a rotary-type radial piston motor |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995022689A1 true WO1995022689A1 (en) | 1995-08-24 |
Family
ID=20392967
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1995/000149 WO1995022689A1 (en) | 1994-02-17 | 1995-02-14 | A valve system in a rotary radial-piston engine |
Country Status (6)
Country | Link |
---|---|
US (1) | US5671702A (en) |
EP (1) | EP0832348A1 (en) |
JP (1) | JPH09512873A (en) |
AU (1) | AU1828695A (en) |
SE (1) | SE502425C2 (en) |
WO (1) | WO1995022689A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998050691A1 (en) * | 1997-05-05 | 1998-11-12 | Kesol Production Ab | A valve system in a rotary radial-piston engine |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1315322B1 (en) * | 2000-04-26 | 2003-02-10 | Bei Claudio De | COMMAND IGNITION ENDOTHERMAL MOTOR AND ROTARY OPERATION |
US7066115B2 (en) * | 2002-09-16 | 2006-06-27 | 9121-6168 Quebec Inc. | Internal combustion engine/hydraulic motor/fluid pump provided with opposite pistons |
US20050061269A1 (en) * | 2003-09-22 | 2005-03-24 | Stotler Scott Gregory | Stotler variable displacement radial rotary piston engine |
US7987823B2 (en) * | 2008-01-24 | 2011-08-02 | William Scott Wiens | Hybrid piston/rotary engine |
US8011346B2 (en) * | 2009-05-29 | 2011-09-06 | Blount David H | Rotary compressed gas engine with pistons |
US8894384B1 (en) * | 2013-11-27 | 2014-11-25 | George Konrad | Multi-piston motor/pump |
CN104373208B (en) * | 2014-10-15 | 2016-08-31 | 中国南方航空工业(集团)有限公司 | A kind of radial-piston engine |
CN110821569B (en) * | 2019-12-23 | 2024-04-02 | 广西师范大学 | Pneumatic engine |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990004709A1 (en) * | 1988-10-24 | 1990-05-03 | Kesol Production Ab | A four-stroke radial-piston engine |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE397840C (en) * | 1924-06-30 | Wladimir De Wasmundt | Motor with rotating cylinders | |
FR1604357A (en) * | 1968-05-17 | 1971-11-08 | ||
US3828740A (en) * | 1972-09-05 | 1974-08-13 | Townsend Engineering Co | Rotary internal combustion engine and method of cooling the same |
US3857372A (en) * | 1972-09-05 | 1974-12-31 | Townsend Engineering Co | Rotary internal combustion engine |
US3885533A (en) * | 1972-09-05 | 1975-05-27 | Townsend Engineering Co | Rotary internal combustion engine and method of controlling the combustion thereof |
US3874348A (en) * | 1972-09-05 | 1975-04-01 | Townsend Engineering Co | Rotary internal combustion engine |
US3822681A (en) * | 1972-09-05 | 1974-07-09 | Townsend Engineering Co | Rotary internal combustion engine |
US3967599A (en) * | 1973-04-16 | 1976-07-06 | Townsend Engineering Company | Rotary internal combustion engine and method of cooling the same |
GB1520292A (en) * | 1974-08-05 | 1978-08-02 | Townsend Engineering Co | Internal combustion engine and method of operating the same |
SE385946B (en) * | 1974-10-25 | 1976-07-26 | S Henstrom | PISTON ENGINE |
US4003351A (en) * | 1975-06-02 | 1977-01-18 | Gunther William E | Rotary engine |
US4653438A (en) * | 1984-02-27 | 1987-03-31 | Russell Robert L | Rotary engine |
EP0477256B1 (en) * | 1989-06-12 | 1993-08-25 | Josef Gail | Piston engine |
-
1994
- 1994-02-17 SE SE9400536A patent/SE502425C2/en not_active IP Right Cessation
-
1995
- 1995-02-14 AU AU18286/95A patent/AU1828695A/en not_active Abandoned
- 1995-02-14 US US08/693,066 patent/US5671702A/en not_active Expired - Fee Related
- 1995-02-14 JP JP7521749A patent/JPH09512873A/en active Pending
- 1995-02-14 WO PCT/SE1995/000149 patent/WO1995022689A1/en not_active Application Discontinuation
- 1995-02-14 EP EP95910049A patent/EP0832348A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990004709A1 (en) * | 1988-10-24 | 1990-05-03 | Kesol Production Ab | A four-stroke radial-piston engine |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998050691A1 (en) * | 1997-05-05 | 1998-11-12 | Kesol Production Ab | A valve system in a rotary radial-piston engine |
Also Published As
Publication number | Publication date |
---|---|
JPH09512873A (en) | 1997-12-22 |
SE9400536D0 (en) | 1994-02-17 |
SE9400536L (en) | 1995-08-18 |
US5671702A (en) | 1997-09-30 |
EP0832348A1 (en) | 1998-04-01 |
AU1828695A (en) | 1995-09-04 |
SE502425C2 (en) | 1995-10-16 |
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