GB2143619A - Reed valves for internal combustion engines - Google Patents

Reed valves for internal combustion engines Download PDF

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Publication number
GB2143619A
GB2143619A GB08319533A GB8319533A GB2143619A GB 2143619 A GB2143619 A GB 2143619A GB 08319533 A GB08319533 A GB 08319533A GB 8319533 A GB8319533 A GB 8319533A GB 2143619 A GB2143619 A GB 2143619A
Authority
GB
United Kingdom
Prior art keywords
valve
engine
fibreglass
epoxide
reed
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
GB08319533A
Other versions
GB2143619B (en
GB8319533D0 (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 GB08319533A priority Critical patent/GB2143619B/en
Publication of GB8319533D0 publication Critical patent/GB8319533D0/en
Priority to US06/632,810 priority patent/US4643139A/en
Priority to JP15195384A priority patent/JPS6040876A/en
Publication of GB2143619A publication Critical patent/GB2143619A/en
Application granted granted Critical
Publication of GB2143619B publication Critical patent/GB2143619B/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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/20—Resin

Landscapes

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

Abstract

A reed valve for an internal combustion engine comprises an aperture closeable by a resilient valve member composed of an epoxide resin laminate. The laminate preferably includes cotton.

Description

SPECIFICATION Reed valves for internal combustion engines This invention relates to reed valves for internal combustion engines, particularly but not exclusively for the air intakes two-stroke engines.
A conventional reed valve comprises an aperture closed by a resilient flexible member composed of steel or of fibreglass. Suction upon the valve by the engine causes the member to deflect, opening the aperture and admitting air to the engine. Open- ing and closing of the valve at a rate equal to the rate o revolution of the engine, creates considerable strain on the flexible member. Fragmentation of the latter is regularly encountered.
Reed valves having steel flexible members are disadvantageous in that entry into the engine of fragments of the member causes considerable damage.
Fibreglass valve members are more prone to fragmentation than steel members although fibreglass fragments are not so damaging to the engine.
According to the present invention there is provided an internal combustion engine reed valve comprising an aperture closeable by a resilient valve member composed of an epoxide resin lami nate.
The laminate preferably comprises a textile material. Preferred textile materials include natural fibres such as cotton or linen or artificial fibres such as Terylene (Registered Trade Marks). Lami- nates comprising paper, asbestos or other fabric may also be used. Use of cotton is especially preferred. Epoxide resin valve members have a greater range of resonant frequencies than fibreglass members. It is important that the valve member is arranged to resonate at the frequencies of actuation of the valve, that is at the range of r.p.m., at which the engine is used.
Epoxide resin textile laminates have a lower density and greater resilience than fibreglass. Resistance to impart fatigue is also greater. The force with which the valve member impinges upon the valve seat is therefore less, resulting in reduced fatigue of the member. Epoxide also has a superior modulus of elasticity to fibreglass. The lower density permits use of thicker laminates having a wider range of mechanical properties e.g. resonant frequencies.
Furthermore, epoxide does not exhibit the tendency to disintegration once damage has occurred that is characteristic of fibreglass valve members.
The reed valve may be spaced from the engine to reduce thermal damage to the epoxide.
A particularly preferred epoxide is TUFNOL 6F/ 45, manufactured by Tufnol Limited.
CLA'MS: 1. An internal combustion engine reed valve comprising an aperture closeable by a resilient valve member composed of an epoxide resin laminate.
2. A valve as claimed in claim 1, wherein the laminate includes a textile material.
3. A valve as claimed in claim 2, wherein the textile material is cotton.
4. A valve as claimed in claim 2, wherein the textile material comprises linen or Terylene (Registered Trade Mark).
5. A valve as claimed in claim 1, wherein the laminate includes paper or asbestos.
6. A valve as claimed in any preceding claim wherein the epoxide is TUFNOL 6Fi45.
7. A valve as claimed in claim 1, substantially as hereinbefore described.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Reed valves for internal combustion engines This invention relates to reed valves for internal combustion engines, particularly but not exclusively for the air intakes two-stroke engines. A conventional reed valve comprises an aperture closed by a resilient flexible member composed of steel or of fibreglass. Suction upon the valve by the engine causes the member to deflect, opening the aperture and admitting air to the engine. Open- ing and closing of the valve at a rate equal to the rate o revolution of the engine, creates considerable strain on the flexible member. Fragmentation of the latter is regularly encountered. Reed valves having steel flexible members are disadvantageous in that entry into the engine of fragments of the member causes considerable damage. Fibreglass valve members are more prone to fragmentation than steel members although fibreglass fragments are not so damaging to the engine. According to the present invention there is provided an internal combustion engine reed valve comprising an aperture closeable by a resilient valve member composed of an epoxide resin lami nate. The laminate preferably comprises a textile material. Preferred textile materials include natural fibres such as cotton or linen or artificial fibres such as Terylene (Registered Trade Marks). Lami- nates comprising paper, asbestos or other fabric may also be used. Use of cotton is especially preferred. Epoxide resin valve members have a greater range of resonant frequencies than fibreglass members. It is important that the valve member is arranged to resonate at the frequencies of actuation of the valve, that is at the range of r.p.m., at which the engine is used. Epoxide resin textile laminates have a lower density and greater resilience than fibreglass. Resistance to impart fatigue is also greater. The force with which the valve member impinges upon the valve seat is therefore less, resulting in reduced fatigue of the member. Epoxide also has a superior modulus of elasticity to fibreglass. The lower density permits use of thicker laminates having a wider range of mechanical properties e.g. resonant frequencies. Furthermore, epoxide does not exhibit the tendency to disintegration once damage has occurred that is characteristic of fibreglass valve members. The reed valve may be spaced from the engine to reduce thermal damage to the epoxide. A particularly preferred epoxide is TUFNOL 6F/ 45, manufactured by Tufnol Limited. CLA'MS:
1. An internal combustion engine reed valve comprising an aperture closeable by a resilient valve member composed of an epoxide resin laminate.
2. A valve as claimed in claim 1, wherein the laminate includes a textile material.
3. A valve as claimed in claim 2, wherein the textile material is cotton.
4. A valve as claimed in claim 2, wherein the textile material comprises linen or Terylene (Registered Trade Mark).
5. A valve as claimed in claim 1, wherein the laminate includes paper or asbestos.
6. A valve as claimed in any preceding claim wherein the epoxide is TUFNOL 6Fi45.
7. A valve as claimed in claim 1, substantially as hereinbefore described.
GB08319533A 1983-07-20 1983-07-20 Reed valves for internal combustion engines Expired GB2143619B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB08319533A GB2143619B (en) 1983-07-20 1983-07-20 Reed valves for internal combustion engines
US06/632,810 US4643139A (en) 1983-07-20 1984-07-20 Reed valves for internal combustion engines
JP15195384A JPS6040876A (en) 1983-07-20 1984-07-20 Reed valve for internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08319533A GB2143619B (en) 1983-07-20 1983-07-20 Reed valves for internal combustion engines

Publications (3)

Publication Number Publication Date
GB8319533D0 GB8319533D0 (en) 1983-08-24
GB2143619A true GB2143619A (en) 1985-02-13
GB2143619B GB2143619B (en) 1986-05-14

Family

ID=10545983

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08319533A Expired GB2143619B (en) 1983-07-20 1983-07-20 Reed valves for internal combustion engines

Country Status (2)

Country Link
JP (1) JPS6040876A (en)
GB (1) GB2143619B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0679630B2 (en) * 1985-10-28 1994-10-12 ブラザー工業株式会社 sewing machine
JPH0118157Y2 (en) * 1985-11-06 1989-05-26

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1025713A (en) * 1962-02-15 1966-04-14 Harry Lees Improvements in or relating to plate valve assemblies for gas and air compressors
GB1113982A (en) * 1963-11-25 1968-05-15 Bell S Asbestos And Engineerin Improvements in or relating to fluid valves
GB1210521A (en) * 1966-09-01 1970-10-28 North American Rockwell A combination of a starter turbine and a resonant combustion apparatus
US3983900A (en) * 1975-12-09 1976-10-05 Airhart Tom P Reed valves formed of high modulus fiber reinforced resin
GB1495907A (en) * 1975-08-04 1977-12-21 Nippon Oil Seal Ind Co Ltd Reed valve
GB1575579A (en) * 1976-10-21 1980-09-24 Nippon Oil Seal Ind Co Ltd Reed valve assembly

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1025713A (en) * 1962-02-15 1966-04-14 Harry Lees Improvements in or relating to plate valve assemblies for gas and air compressors
GB1113982A (en) * 1963-11-25 1968-05-15 Bell S Asbestos And Engineerin Improvements in or relating to fluid valves
GB1210521A (en) * 1966-09-01 1970-10-28 North American Rockwell A combination of a starter turbine and a resonant combustion apparatus
GB1495907A (en) * 1975-08-04 1977-12-21 Nippon Oil Seal Ind Co Ltd Reed valve
US3983900A (en) * 1975-12-09 1976-10-05 Airhart Tom P Reed valves formed of high modulus fiber reinforced resin
GB1575579A (en) * 1976-10-21 1980-09-24 Nippon Oil Seal Ind Co Ltd Reed valve assembly

Also Published As

Publication number Publication date
GB2143619B (en) 1986-05-14
JPS6040876A (en) 1985-03-04
GB8319533D0 (en) 1983-08-24

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PCNP Patent ceased through non-payment of renewal fee