GB2114218A - Crankcase compression four-stroke engine - Google Patents

Crankcase compression four-stroke engine Download PDF

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Publication number
GB2114218A
GB2114218A GB08132095A GB8132095A GB2114218A GB 2114218 A GB2114218 A GB 2114218A GB 08132095 A GB08132095 A GB 08132095A GB 8132095 A GB8132095 A GB 8132095A GB 2114218 A GB2114218 A GB 2114218A
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United Kingdom
Prior art keywords
cylinder
crankcase
engine
air
stroke
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Withdrawn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
GB08132095A
Inventor
Derek Francis Green
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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 GB08132095A priority Critical patent/GB2114218A/en
Publication of GB2114218A publication Critical patent/GB2114218A/en
Withdrawn legal-status Critical Current

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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
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • F02B33/02—Engines with reciprocating-piston pumps; Engines with crankcase pumps
    • F02B33/26—Four-stroke engines characterised by having crankcase pumps
    • 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
    • F02B75/24—Multi-cylinder engines with cylinders arranged oppositely relative to main shaft and of "flat" type
    • F02B75/243—Multi-cylinder engines with cylinders arranged oppositely relative to main shaft and of "flat" type with only one crankshaft of the "boxer" type, e.g. all connecting rods attached to separate crankshaft bearings

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Supercharger (AREA)

Abstract

Mixture drawn into the crankcase 1 is supplied to the cylinder(s) 5a, 5b through valve controlled port(s). When a single piston is associated with the crankcase, mixture is stored in the transfer passage 6 during the exhaust strokes. <IMAGE>

Description

SPECIFICATION A method of using crankcase compression to supercharge a 4 stroke i.c. engine I This method applies to engines in which the volume of the Crankcase changes by an amount greater than the volume of any one cylinder during one revolution.
II An embodiment of the method as applied to a horizontally opposed twin cylinder engine is described below.
Ill The Induction of the fuel-air mixture into the Cylinders is in two stages. Mixture is first drawn into the Crankcase via a port uncovered by the motion of the Piston, the rotation of the Crankshaft, or a reed valve operated by Crankcase vacuum. (In this it is identical with 2 stroke practice.) From the Crankcase the mixture is passed to the Cylinder under pressure via a Transfer Passage which links the Crankcase to the Inlet Valve(s) of each Cylinder. See FIGURE 1 (which also identifies the various parts). FIGURE 1 shows the engine midway through the Exhaust Stroke, Cylinder I and the Compression Stroke, Cylinder II. Near "Top Dead Centre" the Intake Port opens and the Crankcase is filled with mixture. At, or about, Top Dead Centre the Exhaust Valve in Cylinder I closes and the Inlet Valve opens. This is the second part of the Induction cycle.See FIGURE 2.
As the Pistons descend the Intake Port closes and the mixture in the Crankcase is compressed. Because both Pistons are involved, the displacement of the Crankcase alters by the total volume of the engine. But only one Cylinder is open to the Transfer Passage, thus that Cylinder is charged to a greater pressure than would be possible by normal aspiration. In effect it can be said to be "Supercharged".
FIGURE 3 shows the engine in this condition.
Cylinder I is about to commence the Compression Stroke and Cylinder 11 the Exhaust Stroke.
IV An embodiment of the method as applied to single cylinder engines.
V The principle is the same as that applied to twin cylinder engines described, with the following difference: Asimple non-return valve is interposed between the Crankcase and the Transfer Passage, (which may be largerthan that used on twin cylinder engines).
The valve may take the form of a port uncovered by the motion of the Crankshaft, or opened by pressure differential.
On the first stroke the charge is stored in the Transfer Passage under pressure.
On the second stroke the Inlet Valve opens and the "double charge" enters the Cylinder.
VI There is no limittothe number of cylinders such a n engine may have, provided that each cylinder, or pair of cylinders, is isolated on its own Crankcase.
1. Afour-stroke reciprocating internal combustion engine in which the, or each, cylinder has valve controlled inlet and exhaust ports, means to admit air or air/fuel mixture into a sealed crankcase zone associated with the cylinder, at predetermined periods during the engine cycle and a transfer passage connecting said crankcase zone to the respective inlet port to conduct air or air/fuel mixture compressed behind the respective piston for admission to the combustion space of the cylinder during the induction stroke.
2. An engine as claimed in Claim 1 wherein said means comprise a further port in the wall of the cylinder which is uncovered by said piston as the piston moves towards its top dead centre position.
3. An engine as claimed in Claim 1 wherein said means comprise an intake port uncovered at said predetermined periods by rotation of the crankshaft.
4. An engine as claimed in Claim 1 wherein said means comprise a valve controlled intake passage.
5. An engine as claimed in Claim 4 wherein said valve controlling said intake passage is adapted to open in response to sub-atmospheric pressure within said crankcase zone to allow air or air/fuel mixture to be induced into the crankcase zone.
6. An engine as claimed in any preceding Claim having at least one pair of pistons, and a common sealed crankcase zone associated with the, or each, pair of pistons, with the pistons of the, or each, pair of pistons, with the pistons of the, or each, pair thereof being operated such that when one piston performs its induction stroke the other piston performs its power stroke and such that during each revolution of the crankshaft the volume of the common crankcase zone is altered by an amount equal to the combined swept volumes of the two cylinders, and wherein a transfer passage connects the common crankcase zone to the valve controlled inlet port of each of the two cylinders.
7. An engine as claimed in Claim 6 wherein said pistons of the, or each, pair operate in a pair of opposed cylinders having a common sealed crankcase therebetween.
8. An engine as claimed in any of Claims 1 to 5 wherein the, or each, cylinder has a respective sealed crankcase which communicates with the inlet port(s) of that cylinder through a transfer passage which is controlled by a valve such that air or air/fuel mixture is stored in such passage during the exhaust stroke for admission into the combustion space of the cylinder together with a further charge of air or air-fuel mixture from the crankcase during the subsequent induction stroke.
9. A four stroke reciprocating internal combustion engine substantially as hereinbefore described.
10. Afourstroke reciprocating internal combus tion engine substantially as hereinbefore described with reference to, and as illustrated in, the accom panying drawings.
11. A method of supercharging a four stroke reciprocating internal combustion engine, compris ing admitting air or air/fuel mixture into a sealed crankcase zone associated with a cylinder, or pair of cylinders, of the engine at predetermined periods
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (13)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A method of using crankcase compression to supercharge a 4 stroke i.c. engine I This method applies to engines in which the volume of the Crankcase changes by an amount greater than the volume of any one cylinder during one revolution. II An embodiment of the method as applied to a horizontally opposed twin cylinder engine is described below. Ill The Induction of the fuel-air mixture into the Cylinders is in two stages. Mixture is first drawn into the Crankcase via a port uncovered by the motion of the Piston, the rotation of the Crankshaft, or a reed valve operated by Crankcase vacuum. (In this it is identical with 2 stroke practice.) From the Crankcase the mixture is passed to the Cylinder under pressure via a Transfer Passage which links the Crankcase to the Inlet Valve(s) of each Cylinder. See FIGURE 1 (which also identifies the various parts). FIGURE 1 shows the engine midway through the Exhaust Stroke, Cylinder I and the Compression Stroke, Cylinder II. Near "Top Dead Centre" the Intake Port opens and the Crankcase is filled with mixture. At, or about, Top Dead Centre the Exhaust Valve in Cylinder I closes and the Inlet Valve opens. This is the second part of the Induction cycle.See FIGURE 2. As the Pistons descend the Intake Port closes and the mixture in the Crankcase is compressed. Because both Pistons are involved, the displacement of the Crankcase alters by the total volume of the engine. But only one Cylinder is open to the Transfer Passage, thus that Cylinder is charged to a greater pressure than would be possible by normal aspiration. In effect it can be said to be "Supercharged". FIGURE 3 shows the engine in this condition. Cylinder I is about to commence the Compression Stroke and Cylinder 11 the Exhaust Stroke. IV An embodiment of the method as applied to single cylinder engines. V The principle is the same as that applied to twin cylinder engines described, with the following difference: Asimple non-return valve is interposed between the Crankcase and the Transfer Passage, (which may be largerthan that used on twin cylinder engines). The valve may take the form of a port uncovered by the motion of the Crankshaft, or opened by pressure differential. On the first stroke the charge is stored in the Transfer Passage under pressure. On the second stroke the Inlet Valve opens and the "double charge" enters the Cylinder. VI There is no limittothe number of cylinders such a n engine may have, provided that each cylinder, or pair of cylinders, is isolated on its own Crankcase. CLAIMS
1. Afour-stroke reciprocating internal combustion engine in which the, or each, cylinder has valve controlled inlet and exhaust ports, means to admit air or air/fuel mixture into a sealed crankcase zone associated with the cylinder, at predetermined periods during the engine cycle and a transfer passage connecting said crankcase zone to the respective inlet port to conduct air or air/fuel mixture compressed behind the respective piston for admission to the combustion space of the cylinder during the induction stroke.
2. An engine as claimed in Claim 1 wherein said means comprise a further port in the wall of the cylinder which is uncovered by said piston as the piston moves towards its top dead centre position.
3. An engine as claimed in Claim 1 wherein said means comprise an intake port uncovered at said predetermined periods by rotation of the crankshaft.
4. An engine as claimed in Claim 1 wherein said means comprise a valve controlled intake passage.
5. An engine as claimed in Claim 4 wherein said valve controlling said intake passage is adapted to open in response to sub-atmospheric pressure within said crankcase zone to allow air or air/fuel mixture to be induced into the crankcase zone.
6. An engine as claimed in any preceding Claim having at least one pair of pistons, and a common sealed crankcase zone associated with the, or each, pair of pistons, with the pistons of the, or each, pair of pistons, with the pistons of the, or each, pair thereof being operated such that when one piston performs its induction stroke the other piston performs its power stroke and such that during each revolution of the crankshaft the volume of the common crankcase zone is altered by an amount equal to the combined swept volumes of the two cylinders, and wherein a transfer passage connects the common crankcase zone to the valve controlled inlet port of each of the two cylinders.
7. An engine as claimed in Claim 6 wherein said pistons of the, or each, pair operate in a pair of opposed cylinders having a common sealed crankcase therebetween.
8. An engine as claimed in any of Claims 1 to 5 wherein the, or each, cylinder has a respective sealed crankcase which communicates with the inlet port(s) of that cylinder through a transfer passage which is controlled by a valve such that air or air/fuel mixture is stored in such passage during the exhaust stroke for admission into the combustion space of the cylinder together with a further charge of air or air-fuel mixture from the crankcase during the subsequent induction stroke.
9. A four stroke reciprocating internal combustion engine substantially as hereinbefore described.
10. Afourstroke reciprocating internal combus tion engine substantially as hereinbefore described with reference to, and as illustrated in, the accom panying drawings.
11. A method of supercharging a four stroke reciprocating internal combustion engine, compris ing admitting air or air/fuel mixture into a sealed crankcase zone associated with a cylinder, or pair of cylinders, of the engine at predetermined periods during the engine cycle, and passing therefrom via a transfer passage air or air/fuel mixture compressed behind the respective piston or pistons to a valvecontrolled inlet port of the, or each, cylinder for admission to the combustion space thereof during the induction stroke.
12. A method according to Claim 11 wherein a charge of compressed air or air/fuel mixture is stored temporarily in the transfer passage during the exhaust stroke for admission into said combustion space during the subsequent induction stroke together with a further charge of air or air/fuel mixture which is compressed behind the piston during that induction stroke.
13. A method of supercharging a four stroke reciprocating internal combustion engine, substantially as hereinbefore described.
GB08132095A 1981-10-23 1981-10-23 Crankcase compression four-stroke engine Withdrawn GB2114218A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08132095A GB2114218A (en) 1981-10-23 1981-10-23 Crankcase compression four-stroke engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08132095A GB2114218A (en) 1981-10-23 1981-10-23 Crankcase compression four-stroke engine

Publications (1)

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GB2114218A true GB2114218A (en) 1983-08-17

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0295823A2 (en) * 1987-06-18 1988-12-21 George M. Barrett Internal combustion engine assembly
GB2263307A (en) * 1992-01-07 1993-07-21 Christopher John Mccann Four-stroke engine with a charge pump.
GB2328476A (en) * 1997-08-20 1999-02-24 Decorule Ltd A hybrid engine for a vehicle with a balanced flat I.C. engine and a generator with rotating permanent magnets
DE19829430A1 (en) * 1998-07-01 2000-01-05 Horst Ruediger Two-stroke diesel engine
GB2349418A (en) * 1999-04-29 2000-11-01 Leonard Thomas Biddulph Crankcase-supercharged four-stroke i.c. engine with at least one pair of cylinders
WO2001049997A1 (en) * 1999-12-30 2001-07-12 Ecoforce Pty. Ltd. Internal combustion engines
CN107448282A (en) * 2017-09-25 2017-12-08 苏州光耀智能发电机有限公司 A kind of rotary dynamical system based on free-piston

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0295823A2 (en) * 1987-06-18 1988-12-21 George M. Barrett Internal combustion engine assembly
EP0295823A3 (en) * 1987-06-18 1989-09-27 George M. Barrett Internal combustion engine assembly
GB2263307A (en) * 1992-01-07 1993-07-21 Christopher John Mccann Four-stroke engine with a charge pump.
GB2328476A (en) * 1997-08-20 1999-02-24 Decorule Ltd A hybrid engine for a vehicle with a balanced flat I.C. engine and a generator with rotating permanent magnets
GB2328476B (en) * 1997-08-20 2002-02-06 Decorule Ltd Reciprocatory engine
DE19829430A1 (en) * 1998-07-01 2000-01-05 Horst Ruediger Two-stroke diesel engine
GB2349418A (en) * 1999-04-29 2000-11-01 Leonard Thomas Biddulph Crankcase-supercharged four-stroke i.c. engine with at least one pair of cylinders
WO2001049997A1 (en) * 1999-12-30 2001-07-12 Ecoforce Pty. Ltd. Internal combustion engines
JP2003519326A (en) * 1999-12-30 2003-06-17 エコフォース プロプライエタリー リミテッド Internal combustion engine
US6712039B2 (en) 1999-12-30 2004-03-30 Ecoforce Pty Ltd Internal combustion engines
CN107448282A (en) * 2017-09-25 2017-12-08 苏州光耀智能发电机有限公司 A kind of rotary dynamical system based on free-piston
CN107448282B (en) * 2017-09-25 2023-09-08 苏州光耀智能发电机有限公司 Rotary swing type power system based on free piston

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