FR2248411A1 - Two-stroke engine with inlet via crank case - has exhaust ports and overflow ducts from crank case to cylinder in cylinder wall - Google Patents

Two-stroke engine with inlet via crank case - has exhaust ports and overflow ducts from crank case to cylinder in cylinder wall

Info

Publication number
FR2248411A1
FR2248411A1 FR7435002A FR7435002A FR2248411A1 FR 2248411 A1 FR2248411 A1 FR 2248411A1 FR 7435002 A FR7435002 A FR 7435002A FR 7435002 A FR7435002 A FR 7435002A FR 2248411 A1 FR2248411 A1 FR 2248411A1
Authority
FR
France
Prior art keywords
ducts
crank case
cylinder
ports
cylinder wall
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Withdrawn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
FR7435002A
Other languages
French (fr)
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.)
HALDER ENGINES Ltd
Original Assignee
HALDER ENGINES Ltd
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 HALDER ENGINES Ltd filed Critical HALDER ENGINES Ltd
Publication of FR2248411A1 publication Critical patent/FR2248411A1/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Withdrawn legal-status Critical Current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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • F02B25/14—Engines characterised by using fresh charge for scavenging cylinders using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke
    • 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
    • F01L7/12—Rotary or oscillatory slide valve-gear or valve arrangements specially for two-stroke engines
    • 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

Abstract

The inlet port in the crank case is provided with an inlet valve. Exhaust is via a number of exhaust ports arranged around the circumference of the cylinder wall. The overflow consists of a number of longitudinal ducts spaced around the circumference of the cylinder wall. The arrangement of ports and ducts may be symmetrical, and ports may alternate with ducts. The distance from the cylinder head to the highest point of the ducts is pref. greater than that to the top of the ports. The relative position of ports and ducts is preferably such that, on its downward stroke, the piston opens at least half the cross-sectional port area before reaching the highest point of the ducts. The inlet valve may be a rotary disc valve coupled to the crank shaft.
FR7435002A 1973-10-18 1974-10-17 Two-stroke engine with inlet via crank case - has exhaust ports and overflow ducts from crank case to cylinder in cylinder wall Withdrawn FR2248411A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4862473 1973-10-18

Publications (1)

Publication Number Publication Date
FR2248411A1 true FR2248411A1 (en) 1975-05-16

Family

ID=10449304

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7435002A Withdrawn FR2248411A1 (en) 1973-10-18 1974-10-17 Two-stroke engine with inlet via crank case - has exhaust ports and overflow ducts from crank case to cylinder in cylinder wall

Country Status (5)

Country Link
JP (1) JPS50111428A (en)
AU (1) AU7447674A (en)
DE (1) DE2449368A1 (en)
FR (1) FR2248411A1 (en)
IT (1) IT1024299B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2588043A1 (en) * 1985-10-02 1987-04-03 Gilardoni Vittorio Spa METHOD FOR INCREASING THE PERFORMANCE OF TWO-STROKE INTERNAL COMBUSTION ENGINES AND PISTON-CYLINDER UNIT FOR SUCH ENGINES

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2910822C2 (en) * 1979-03-20 1982-12-09 Norbert 8000 München Dylla Air-cooled, rotary valve controlled four-stroke combustion engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2588043A1 (en) * 1985-10-02 1987-04-03 Gilardoni Vittorio Spa METHOD FOR INCREASING THE PERFORMANCE OF TWO-STROKE INTERNAL COMBUSTION ENGINES AND PISTON-CYLINDER UNIT FOR SUCH ENGINES
EP0217374A1 (en) * 1985-10-02 1987-04-08 Dott. Vittorio Gilardoni S.p.A. Piston-cylinder unit for a two-stroke internal combustion engine

Also Published As

Publication number Publication date
JPS50111428A (en) 1975-09-02
DE2449368A1 (en) 1975-04-24
IT1024299B (en) 1978-06-20
AU7447674A (en) 1976-04-29

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Legal Events

Date Code Title Description
ST Notification of lapse