GB2143895A - Pyramidal reed vales for two-stroke engines - Google Patents

Pyramidal reed vales for two-stroke engines Download PDF

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Publication number
GB2143895A
GB2143895A GB08319907A GB8319907A GB2143895A GB 2143895 A GB2143895 A GB 2143895A GB 08319907 A GB08319907 A GB 08319907A GB 8319907 A GB8319907 A GB 8319907A GB 2143895 A GB2143895 A GB 2143895A
Authority
GB
United Kingdom
Prior art keywords
reeds
valve
reed
aperture
fluid
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.)
Granted
Application number
GB08319907A
Other versions
GB2143895B (en
GB8319907D0 (en
Inventor
Bernard James Hargreaves
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB08319907A priority Critical patent/GB2143895B/en
Publication of GB8319907D0 publication Critical patent/GB8319907D0/en
Priority to US06/632,810 priority patent/US4643139A/en
Publication of GB2143895A publication Critical patent/GB2143895A/en
Application granted granted Critical
Publication of GB2143895B publication Critical patent/GB2143895B/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/14—Check valves with flexible valve members
    • F16K15/16—Check valves with flexible valve members with tongue-shaped laminae
    • 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
    • F01L3/205—Reed 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
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • F02B33/02—Engines with reciprocating-piston pumps; Engines with crankcase pumps
    • F02B33/28—Component parts, details or accessories of crankcase pumps, not provided for in, or of interest apart from, subgroups F02B33/02 - F02B33/26
    • F02B33/30—Control of inlet or outlet ports
    • 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
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Check Valves (AREA)

Abstract

A plurality of reeds 3, 4, 5, 6 abut in use at edges 11 to close the valve. <IMAGE>

Description

SPECIFICATION Pyramidal reed valves This invention relates to reed valves for internal combustion engines, particularly but not exclusively to reed valves for two-stroke engines.
According to the present invention an inter nal combustion engine reed valve comprises a plurality of reeds abutting in use to close the valve.
Preferably the edges of said reeds abut to close the valve.
The aperture of the valve is defined by the opposing surfaces of the reeds.
Conventional reed valves comprise a valve body having one or more apertures, each of which is closed by a respective reed. The aperture is defined by a surface of the reed and a surface of the valve body. Passage of air or of a mixture of air and fuel through the aperture is impeded by the immoveable valve body, causing turbulence and reducing the kinetic energy of the flow of fluid.
Use of the present invention is advantageous in that two surfaces of the reeds which may represent the major proportion of the aperture, can move by flexing to allow passage of fluid. The turbulence caused by a fixed obstacle is therefore avoided. The kinetic energy of the fluid flow is not expended against an immoveable surface. Use of two or more abutting reeds increases the sensitivity of the valve to flutuations in fluid pressure.
The reeds are preferably disposed symmetrically about the direction of flow of fluid through the valve.
A valve comprising two reeds may be arranged with the reeds disposed in a prismatic configuration. The angle between the reeds is preferably less than 90 , more preferably between 35 and 65 . An angle of approximately 45 has been found to be particularly appropriate.
A valve comprising three or more reeds may be arranged with the latter disposed in a pyramidal configuration.
The reeds may be composed of an epoxide resin laminate material. Use of the laminate Tufnol (RTM) 6F/45 has been found to be particularly suitable.
A valve may comprise a plurality of pairs of prismatically arranged reeds. The plurality of pairs may be disposed side-by-side in an overall prismatic arrangement.
immoveable side pieces are preferably provided between the reeds. A prismatic arrangement comprising two reeds may incorporate two triangular side pieces. A prismatic arrangement comprising a plurality of pairs of reeds may incorporate triangular end pieces.
Struts may be provided between adjacent reeds to abut and support the side surfaces of the latter when the valve is closed.
The side pieces and struts may be provided with flexible valve seats composed, for example, of rubber or other durable material.
The invention is further described by means of example with reference to Figs. 1 and 2 of the accompanying drawings, of which: Figure 1 illustrates a valve in accordance with this invention; and Figure 2 is an exploded view of the valve.
The valve shown in the Figures is adapted for use with a two stroke engine, for example for an outboard motor for a boat.
The valve body 1 contains a generally rectangular inlet 2 and supports two pairs of reeds3, 4, 5, 6. The reeds comprise sheets of a laminate material comprising epoxide resin and cotton manufactured under the Trade Mark Tufnol (RTM) 6F/45. The reeds are secured remote from the aperture of the valve by means of screws 7 to side pieces 8, 9 and struts 10. The edges of the reeds 11 abut when the reeds are not under tension. The reeds are arranged at an angle of 45 although angles between 35 and 65 may be used. The reeds cooperate with the side pieces 8, 9 and struts 10 to seal the aperture 2. Curved plates 1 2 prevent excessive flexing of the reeds.The curved plates 12, which may be replaced in alternative embodiments by the valve housings, serve to allow progressive curvature of the reeds rather than hinging of the latter about the fixing screws. Pressure of fluid (air or a mixture of fuel and air) within the aperture 2, caused for example, by a vacuum induced on the upper exterior part of the valve (as shown in the Figures), causes the reeds to flex towards the plates 12, allowing the passage of air. Release of the pressure allows the resilience of the reeds to close the valve. The characteristics of the valve may be chosen by selection of reeds having an appropriate resilience and thickness. The resonant frequency of the valve may be chosen to match the rate of revolution of an engine by selection of reeds with appropriate dimensions.
Use of a plurality of reeds reduces the degree of flexing required of each reed, with a consequent reduction in the stress upon the reeds.
1. An internal combustion engine reed valve comprising a plurality of reeds abutting in use to close the valve.
2. A valve as claimed in claim 1, wherein edges of the reeds abut to close the valve.
3. A valve as claimed in claim 2, wherein an aperture of the valve is defined by opposing surfaces of the reeds.
4. A valve as claimed in claim 2 or 3, wherein the reeds are disposed symmetrically about a direction of flow of fluid through the valve.
5. A valve as claimed in any preceding
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (14)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Pyramidal reed valves This invention relates to reed valves for internal combustion engines, particularly but not exclusively to reed valves for two-stroke engines. According to the present invention an inter nal combustion engine reed valve comprises a plurality of reeds abutting in use to close the valve. Preferably the edges of said reeds abut to close the valve. The aperture of the valve is defined by the opposing surfaces of the reeds. Conventional reed valves comprise a valve body having one or more apertures, each of which is closed by a respective reed. The aperture is defined by a surface of the reed and a surface of the valve body. Passage of air or of a mixture of air and fuel through the aperture is impeded by the immoveable valve body, causing turbulence and reducing the kinetic energy of the flow of fluid. Use of the present invention is advantageous in that two surfaces of the reeds which may represent the major proportion of the aperture, can move by flexing to allow passage of fluid. The turbulence caused by a fixed obstacle is therefore avoided. The kinetic energy of the fluid flow is not expended against an immoveable surface. Use of two or more abutting reeds increases the sensitivity of the valve to flutuations in fluid pressure. The reeds are preferably disposed symmetrically about the direction of flow of fluid through the valve. A valve comprising two reeds may be arranged with the reeds disposed in a prismatic configuration. The angle between the reeds is preferably less than 90 , more preferably between 35 and 65 . An angle of approximately 45 has been found to be particularly appropriate. A valve comprising three or more reeds may be arranged with the latter disposed in a pyramidal configuration. The reeds may be composed of an epoxide resin laminate material. Use of the laminate Tufnol (RTM) 6F/45 has been found to be particularly suitable. A valve may comprise a plurality of pairs of prismatically arranged reeds. The plurality of pairs may be disposed side-by-side in an overall prismatic arrangement. immoveable side pieces are preferably provided between the reeds. A prismatic arrangement comprising two reeds may incorporate two triangular side pieces. A prismatic arrangement comprising a plurality of pairs of reeds may incorporate triangular end pieces. Struts may be provided between adjacent reeds to abut and support the side surfaces of the latter when the valve is closed. The side pieces and struts may be provided with flexible valve seats composed, for example, of rubber or other durable material. The invention is further described by means of example with reference to Figs. 1 and 2 of the accompanying drawings, of which: Figure 1 illustrates a valve in accordance with this invention; and Figure 2 is an exploded view of the valve. The valve shown in the Figures is adapted for use with a two stroke engine, for example for an outboard motor for a boat. The valve body 1 contains a generally rectangular inlet 2 and supports two pairs of reeds3, 4, 5, 6. The reeds comprise sheets of a laminate material comprising epoxide resin and cotton manufactured under the Trade Mark Tufnol (RTM) 6F/45. The reeds are secured remote from the aperture of the valve by means of screws 7 to side pieces 8, 9 and struts 10. The edges of the reeds 11 abut when the reeds are not under tension. The reeds are arranged at an angle of 45 although angles between 35 and 65 may be used. The reeds cooperate with the side pieces 8, 9 and struts 10 to seal the aperture 2. Curved plates 1 2 prevent excessive flexing of the reeds.The curved plates 12, which may be replaced in alternative embodiments by the valve housings, serve to allow progressive curvature of the reeds rather than hinging of the latter about the fixing screws. Pressure of fluid (air or a mixture of fuel and air) within the aperture 2, caused for example, by a vacuum induced on the upper exterior part of the valve (as shown in the Figures), causes the reeds to flex towards the plates 12, allowing the passage of air. Release of the pressure allows the resilience of the reeds to close the valve. The characteristics of the valve may be chosen by selection of reeds having an appropriate resilience and thickness. The resonant frequency of the valve may be chosen to match the rate of revolution of an engine by selection of reeds with appropriate dimensions. Use of a plurality of reeds reduces the degree of flexing required of each reed, with a consequent reduction in the stress upon the reeds. CLAIMS
1. An internal combustion engine reed valve comprising a plurality of reeds abutting in use to close the valve.
2. A valve as claimed in claim 1, wherein edges of the reeds abut to close the valve.
3. A valve as claimed in claim 2, wherein an aperture of the valve is defined by opposing surfaces of the reeds.
4. A valve as claimed in claim 2 or 3, wherein the reeds are disposed symmetrically about a direction of flow of fluid through the valve.
5. A valve as claimed in any preceding claim, wherein the reeds are disposed in a prismatic configuration.
6. A valve as claimed in claim 5, wherein the angle between the reeds is less than 90 .
7. A valve as claimed in claim 6, wherein the said angle is between 35 and 65 .
8. A valve as claimed in claim 7, wherein the said angle is 45 .
9. A valve as claimed in any of claims 5 to 8, comprising a plurality of pairs of prismatically arranged reeds.
10. A valve as claimed in claim 9, wherein the pairs of reeds are disposed sideby-side in an overall prismatic arrangement.
11. A valve as claimed in any of claims 5 to 10 comprising immovable side pieces between the reeds.
12. A valve as claimed in any of claims 1 to 4 wherein three or more reeds are disposed in a pyramidal configuration.
1 3. A two stroke internal combustion engine reed valve as claimed in any preceding claim.
14. A valve substantially as hereinbefore described with reference to Figs. 1 and 2 of the accompanying drawings.
GB08319907A 1983-07-20 1983-07-23 Pyramidal reed valves for two-stroke engines Expired GB2143895B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB08319907A GB2143895B (en) 1983-07-23 1983-07-23 Pyramidal reed valves for two-stroke engines
US06/632,810 US4643139A (en) 1983-07-20 1984-07-20 Reed valves for internal combustion engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08319907A GB2143895B (en) 1983-07-23 1983-07-23 Pyramidal reed valves for two-stroke engines

Publications (3)

Publication Number Publication Date
GB8319907D0 GB8319907D0 (en) 1983-08-24
GB2143895A true GB2143895A (en) 1985-02-20
GB2143895B GB2143895B (en) 1987-01-21

Family

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Family Applications (1)

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GB08319907A Expired GB2143895B (en) 1983-07-20 1983-07-23 Pyramidal reed valves for two-stroke engines

Country Status (1)

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GB (1) GB2143895B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0268339A2 (en) * 1986-11-17 1988-05-25 ADLER S.p.A. Non-return reed valve for the delivery of fuel into internal combustion engines, with directed flow and maximum adjustable opening, with elastic resistance plates
WO1989007216A1 (en) * 1988-01-30 1989-08-10 Kitchen, Rodney, Thomas Reed valve
EP0541473A2 (en) * 1991-11-08 1993-05-12 Francisco Jose Marin Tomas Method of producing intake sheets for two-stroke engines

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB474937A (en) * 1936-09-15 1937-11-10 Anders Vilhelm Sorensen Improvements in dampers for furnace flues
GB1507151A (en) * 1976-03-09 1978-04-12 Adaptogas Ltd Gas valves
GB1540803A (en) * 1977-06-14 1979-02-14 Gen Dynamics Corp Rocket exhaust plenum flow control apparatus
US4340016A (en) * 1980-09-05 1982-07-20 Outboard Marine Corporation Two-stroke internal combustion engine and method of operation thereof
US4378762A (en) * 1980-08-29 1983-04-05 Outboard Marine Corporation Two-stroke internal combustion engine and method of operation thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB474937A (en) * 1936-09-15 1937-11-10 Anders Vilhelm Sorensen Improvements in dampers for furnace flues
GB1507151A (en) * 1976-03-09 1978-04-12 Adaptogas Ltd Gas valves
GB1540803A (en) * 1977-06-14 1979-02-14 Gen Dynamics Corp Rocket exhaust plenum flow control apparatus
US4378762A (en) * 1980-08-29 1983-04-05 Outboard Marine Corporation Two-stroke internal combustion engine and method of operation thereof
US4340016A (en) * 1980-09-05 1982-07-20 Outboard Marine Corporation Two-stroke internal combustion engine and method of operation thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0268339A2 (en) * 1986-11-17 1988-05-25 ADLER S.p.A. Non-return reed valve for the delivery of fuel into internal combustion engines, with directed flow and maximum adjustable opening, with elastic resistance plates
EP0268339A3 (en) * 1986-11-17 1989-08-09 ADLER S.p.A. Non-return reed valve for the delivery of fuel into internal combustion engines, with directed flow and maximum adjustable opening, with elastic resistance plates
WO1989007216A1 (en) * 1988-01-30 1989-08-10 Kitchen, Rodney, Thomas Reed valve
EP0541473A2 (en) * 1991-11-08 1993-05-12 Francisco Jose Marin Tomas Method of producing intake sheets for two-stroke engines
EP0541473A3 (en) * 1991-11-08 1993-06-23 Francisco Jose Marin Tomas Method of producing intake sheets for two-stroke engines

Also Published As

Publication number Publication date
GB2143895B (en) 1987-01-21
GB8319907D0 (en) 1983-08-24

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PCNP Patent ceased through non-payment of renewal fee