GB2129869A - Vacuum-operated air intake valves for i.c. engine mixture intakes - Google Patents

Vacuum-operated air intake valves for i.c. engine mixture intakes Download PDF

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Publication number
GB2129869A
GB2129869A GB08228918A GB8228918A GB2129869A GB 2129869 A GB2129869 A GB 2129869A GB 08228918 A GB08228918 A GB 08228918A GB 8228918 A GB8228918 A GB 8228918A GB 2129869 A GB2129869 A GB 2129869A
Authority
GB
United Kingdom
Prior art keywords
valve
carburettion
vacuum
closed
inlet manifold
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Withdrawn
Application number
GB08228918A
Inventor
Arthur Bradley
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 GB08228918A priority Critical patent/GB2129869A/en
Publication of GB2129869A publication Critical patent/GB2129869A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M23/00—Apparatus for adding secondary air to fuel-air mixture
    • F02M23/04—Apparatus for adding secondary air to fuel-air mixture with automatic control
    • F02M23/08—Apparatus for adding secondary air to fuel-air mixture with automatic control dependent on pressure in main combustion-air induction system, e.g. pneumatic-type apparatus
    • F02M23/09—Apparatus for adding secondary air to fuel-air mixture with automatic control dependent on pressure in main combustion-air induction system, e.g. pneumatic-type apparatus using valves directly opened by low pressure
    • 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

Abstract

The vacuum at which the metal ball 14 moves from its seat 13 against the bias of the spring 6 is adjustable by relative movement of the two metal body parts 2 and 3. <IMAGE>

Description

SPECIFICATION Carburettion systems This invention relates to carburettion systems for internal combustion engines.
In an internal combustion engine which is provided with a carburettion system, there is a tendency for fuel to be wasted when a high vacuum exists in the inlet manifold. This can occur, for example, during deceleration. The temporarily prevailing high vacuum tends to draw excess fuel/air mixture into the cylinders, when it is not required.
The present invention aims to provide a carburettion system in which this disadvantage may be mitigated.
According to one aspect of the present invention, there is provided a carburettion system for an internal combustion engine, comprising an inlet manifold and disposed therein, downstream of a throttle, a vacuum relief valve which is biassed to be closed but is adapted to open to vent the manifold to atmosphere, in response to the pressure in the inlet manifold falling below a predetermined value.
Preferably, the valve is biassed to be closed by a spring, and the valve may comprise a ball which engages a valve seat towards which the ball is biassed to close the valve. The ball may be of metal.
The valve preferably includes adjustment means for adjusting the force of the bias by which the valve is closed. To this end, the valve may comprise a body having at least two portions between which the means for biassing the valve to be closed is constrained, and these two body portions may be moved towards and away from one another, to provide the adjustment means.
The two body portions are preferably in screwthreaded engagement with one another.
Advantageously, the body may comprise only the two body portions, each of which is formed in one piece of metal.
The valve may advantageously be provided with a filter for filtering air which passes through the valve into the manifold.
The valve may be positioned immediately downstream of the throttle, and may be built into a carburettor of the carburettion system.
For a better understanding of the invention and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying diagrammatic drawing, the single figure of which is a sectional view of a vacuum relief valve of a carburettion system in accordance with the invention.
The illustrated vacuum relief valve 1 comprises a body made up of a lower body portion 2 and an upper body portion 3. Each of the body portions 2 and 3 is manufactured in one piece, of metal. The upper part of the lower body portion 2 is formed with an external screw-thread 4, which engages with a corresponding internal screw-thread on the upper body portion 3.
The lower body portion 2 is hollow, and contains a compression spring 6. At the bottom end of the lower body portion 2 there projects a pipe 7, which communicates with the interior of the body portion 2, and is externally screwthreaded, for engagement with a nut 8. A lock nut 9 engages on the externally screw-threaded upper part 4 of the lower body portion 2.
The upper body portion 3 is formed at its top with an opening 10, which is covered with a metal gauze 11, which serves as an air filter. The opening 10 communicates via a passage 12 with a valve seat 13, at the lower edge of the upper body portion 3. A metal ball 14 co-operates with the valve seat 1 3 to close it, under the influence of the spring 6.
In use, the valve 1 is positioned in an inlet manifold of an internal combustion engine. This may be done as a simple modification to an existing engine, by drilling the inlet manifold, topping the hole thus formed, screwing the pipe 7 into the hole, and locking it in place by means of the nut 8. The valve 1 is positioned as close to the carburettor as possible. It may be built into the body of the carburettor itself.
The upper and lower body portions 2 and 3 are screwed together, such that the metal ball 14 closes the valve seat 13, under the influence of the compression spring 6. The lock nut 9 serves to lock the two body portions 2 and 3 in a desired position.
During operation of the engine, the compression spring 6 normally serves to urge the metal ball 14 against the valve seat 13, thereby to close the valve 1. This occurs particularly during acceleration, when the vacuum in the inlet manifold drops.
When the vacuum in the inlet manifold reaches a predetermined value (i.e. when the pressure in the inlet manifold falls below a predetermined value), the vacuum force acting on the metal ball 14 overcomes the spring force of the compression spring 6, and the valve 1 is opened. Immediately, the vacuum in the inlet manifold is compensated, and the valve 1 tends to close again. It will readily be appreciated that, by adjusting the relative positions of the body portions 2 and 3, the spring force of the compression spring 6 will be adjusted.
Consequently, the valve 1 can be finely tuned to open when the pressure in the inlet manifold falls below any desired value.
Thus, when a vehicle is at a cruising speed, there is a small vacuum in the inlet manifold, and the valve 1 may bleed a smail amount of air into the inlet manifold. If desired, the engine can be so tuned that, in this state, the fuel/air mixture entering the cylinders is substantially unchanged from that which would prevail if the valve 1 were not fitted. However, when the throttle closes, a high vacuum temporary prevails in the inlet manifold, and the valve 1 responds immediately, and opens to vent the inlet manifold to atmosphere. Consequently, the tendency to draw excessive fuel/air mixture into the cylinders is reduced.
It may therefore be appreciated that the illustrated vacuum relief valve may be used with great advantage to improve efficiency of an internal combustion engine, and thereby reduce petrol consumption. As the valve 1 may be made substantially all of metal, it may be relatively robust, and capable of withstanding heat. A particular advantage resides in the facility for adjusting the force of the bias which tends to close the valve, as this greatiy facilitates tuning of the engine.
It will be appreciated that, the higher the vacuum in the inlet manifold, the more the valve 1 will tend to open.

Claims (14)

1. A carburettion system for an internal combustion engine, comprising an inlet manifold and disposed therein, downstream of a throttle, a vacuum relief valve which is biassed to be closed but is adapted to open to vent the manifold to atmosphere, in response to the pressure in the inlet manifold falling below a predetermined value.
2. A carburettion system according to Claim 1, wherein the valve is biassed to be closed by a spring.
3. A carburettion system according to Claim 1 or 2, wherein the valve comprises a ball which engages a valve seat towards which the ball is biassed to close the valve.
4. A carburettion system according to Claim 3, wherein the ball is of metal.
5. A carburettion system according to any predetermined claim, including adjustment means for adjusting the force of the bias by which the valve is closed.
6. A carburettion system according to Claim 5, wherein the valve comprises a body having at least two portions between which the means for biassing the valve to be closed is constrained, and said two body portions may be moved towards and away from one another, thereby to provide said adjustment means.
7. A carburettion system according to Claim 6, wherein said two body portions are in screwthreaded engagement with one another.
8. A carburettion system according to Claim 6 or 7, wherein said body comprises only two said body portions, each of which is formed in one piece of metal.
9. A carburettion system according to any preceding claim, wherein the valve is provided with a filter for fiitering air which passes through the valve into the manifold.
10. A carburettion system according to any preceding claim, wherein the valve is positioned immediately downstream of the throttle.
11. A carburettion system according to Claim 10, wherein the valve is built into a carburettor of the carburettion system.
12. A vacuum relief valve substantially as hereinbefore described with reference to the accompanying drawing.
1 3. A carburettion system having a vacuum relief valve according to Claim 12.
14. An internal combustion engine provided with a carburettion system according to any one of Claims 1 to 11 or to Claim 13.
GB08228918A 1982-10-09 1982-10-09 Vacuum-operated air intake valves for i.c. engine mixture intakes Withdrawn GB2129869A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08228918A GB2129869A (en) 1982-10-09 1982-10-09 Vacuum-operated air intake valves for i.c. engine mixture intakes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08228918A GB2129869A (en) 1982-10-09 1982-10-09 Vacuum-operated air intake valves for i.c. engine mixture intakes

Publications (1)

Publication Number Publication Date
GB2129869A true GB2129869A (en) 1984-05-23

Family

ID=10533493

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08228918A Withdrawn GB2129869A (en) 1982-10-09 1982-10-09 Vacuum-operated air intake valves for i.c. engine mixture intakes

Country Status (1)

Country Link
GB (1) GB2129869A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2213875A (en) * 1988-01-14 1989-08-23 David Lawrence Nolan I.C. engine intake manifold air inlet valves
WO1996034194A2 (en) * 1995-04-27 1996-10-31 Richard Nigel Bushell Automatic valve for the inlet manifold of an internal combustion engine
EP1039119A2 (en) * 1995-04-27 2000-09-27 Richard Nigel Bushell Automatic air bleed valve
WO2011148132A1 (en) 2010-05-26 2011-12-01 The Urbane Trust Automatic valve for internal combustion engine inlet manifold

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB690635A (en) * 1950-08-30 1953-04-22 Francis Hartley Stroud Control of vacuum in the inlet pipe of an internal combustion engine
GB1299588A (en) * 1969-12-29 1972-12-13 Dorado Res Inc Internal combustion engine supplemental air admission device
GB1302565A (en) * 1969-04-11 1973-01-10
GB1519584A (en) * 1975-07-11 1978-08-02 Mcfarlane J A fuel economiser device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB690635A (en) * 1950-08-30 1953-04-22 Francis Hartley Stroud Control of vacuum in the inlet pipe of an internal combustion engine
GB1302565A (en) * 1969-04-11 1973-01-10
GB1299588A (en) * 1969-12-29 1972-12-13 Dorado Res Inc Internal combustion engine supplemental air admission device
GB1519584A (en) * 1975-07-11 1978-08-02 Mcfarlane J A fuel economiser device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2213875A (en) * 1988-01-14 1989-08-23 David Lawrence Nolan I.C. engine intake manifold air inlet valves
WO1996034194A2 (en) * 1995-04-27 1996-10-31 Richard Nigel Bushell Automatic valve for the inlet manifold of an internal combustion engine
WO1996034194A3 (en) * 1995-04-27 1997-02-20 Richard Nigel Bushell Automatic valve for the inlet manifold of an internal combustion engine
EP1039119A2 (en) * 1995-04-27 2000-09-27 Richard Nigel Bushell Automatic air bleed valve
EP1039120A2 (en) * 1995-04-27 2000-09-27 Richard Nigel Bushell Automatic air bleed valve
EP1039120A3 (en) * 1995-04-27 2000-11-08 Richard Nigel Bushell Automatic air bleed valve
EP1039119A3 (en) * 1995-04-27 2000-11-08 Richard Nigel Bushell Automatic air bleed valve
WO2011148132A1 (en) 2010-05-26 2011-12-01 The Urbane Trust Automatic valve for internal combustion engine inlet manifold

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)