US3771503A - Two-stroke internal combustion engines - Google Patents

Two-stroke internal combustion engines Download PDF

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Publication number
US3771503A
US3771503A US00229317A US3771503DA US3771503A US 3771503 A US3771503 A US 3771503A US 00229317 A US00229317 A US 00229317A US 3771503D A US3771503D A US 3771503DA US 3771503 A US3771503 A US 3771503A
Authority
US
United States
Prior art keywords
disc
crank
engine
cylinders
periphery
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.)
Expired - Lifetime
Application number
US00229317A
Other languages
English (en)
Inventor
J Pirault
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.)
Federal Mogul Shoreham Ltd
Original Assignee
Vandervell Products 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 Vandervell Products Ltd filed Critical Vandervell Products Ltd
Application granted granted Critical
Publication of US3771503A publication Critical patent/US3771503A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F11/00—Arrangements of sealings in combustion engines

Definitions

  • crankcase A t r i pre compressed in the crankcase prior to ad- [51] Int. Cl. F02b 33/04 mission to the cylinders
  • the crankcase is divided into [58] Field of Search 123/73 R1 73 73 two separate pre-compression chambers, are for each 123/73 197 A 55 57 56 56 B cylinder, by a sealing disc rotatably mounted on the crankshaft and in sealing engagement around its pe- [56] References Cited riphery with the crankcase.
  • This invention relates to two-stroke internal combustion engines of the kind having at least two mutually angled cylinders containing pistons, a crankcase in which mixture is compressed before admission to the cylinders for combustion, and a crankshaft in the crankcase to which the pistons are connected.
  • crankcase separates the crankcase into two chambers, one for each cylinder, in which mixture is pre-compressed prior to admission to the cylinders.
  • the invention provides a two-stroke internal combustion engine having at least two mutually angled cylinders containing pistons, a crankcase in which mixture is compressed before admission to the cylinders for combustion, and a crankshaft in the crankcase to which the pistons are connected characterised in that the two pistons are connected to a common crankpin of the crankshaft, a disc is rotatably mounted on the crank pin between the two connections andmeans are provided for sealing the periphery of the disc to the crankcase and permitting relative rotation of the disc with the crankshaft about the axis of the crankshaft with respect to the crankcase.
  • Said sealing means may comprise an annular inwardly facing channel around the crankcase in which the periphery of the disc engages and the disc may be arranged to be axially slidable on the crankshaft between the connections to the pistons so that the periphery of the disc may sealably engage one or the other side of the annular channel according to the difference in pressure in the crankcase on either side of the disc.
  • the outer periphery of the disc and the inner periphery of the disc around the crankshaft may be formed from a polymeric material.
  • the whole disc may be formed from polymeric material.
  • the remainder of the disc may be formed from metal.
  • the polymeric material oroethylene.
  • the cylinders of the engine are arranged in V-formation.
  • the engine may have several cylinders in which case each pair of pistons is connected to a common crankpin of the crankshaft and a disc is provided on the crankpin between each pair of connections.
  • FIG. 1 is a part-section, part-elevation view through a two-stroke internal combustion engine
  • FIG. 2 is a view looking in the direction of the arrow A on FIG. 1;
  • FIG. 3 is a detailed view of part of the crankshaft of the engine.
  • FIG. 1 of the drawings shows a V twin twostroke engine having mutually inclined cylinders 10 and 11 containing pistons 12 and 13.
  • the cylinders are connected to a common crankcase 14 in which a crankshaft 15 is rotatably mounted.
  • the pistons 1 2, 13 are connected by connecting rods 16, 17 respectively to a common crankpin 18 of the crankshaft.
  • a metal disc 19 is rotatably mounted on the crankpin 18 between the connecting rods 16, 17 and the periphery of the disc engages in an annular channel 20 formed around the crankcase.
  • the outer periphery of the disc is coated with polytetrafluoroethylene as indicated at and the inner periphery of the disc is also coated with polytetrafluoroethylene as indicated at 19b.
  • the disc 19 divided the crankcase 14 into two compartments in communication with the cylinders 10, 11 respectively below the pistons 12, 13. Fuel air mixture is drawn into the chambers in succession as the pistons 12, 13 rise in their respective cylinders and is then compressed as the pistons fall and are delivered into the combustion chambers above the pistons through passageways 22, 23 cut in the cylinder walls 10, 11 respectively.
  • a two strgke internal cornbustion engine having at least two mutually angled cylinders 'cd'iiaifiifigisis tons, a crank case in which mixture is compressed before admission to the cylinders for combustion, a crank shaft located in the crank case, said crank shaft having a crank pin to which both said pistons are connected, a disc rotatably mounted on and axially slidable along said crank pin between said connections, and means to seal the periphery of the disc with the crank case comprising an annular inwardly facing channel encircling the crank case, said periphery of the disc engaging in the channel whereby a difference in pressure on either side of the disc forces the periphery of the disc against one or the other side of the channel to form a seal therewith.
  • a two stroke internal combustion engine having at least two mutually angled cylinders containing pistons, a crank case in which mixture is compressed before admission to the cylinders for combustion, a crank shaft located in the crank case, said crank shaft having a crank pin to which both said pistons are connected, a disc rotatably mounted on and axially slidable along the crank pin between said connections and means to seal the periphery of the disc to the crank case while permitting the disc to rotate with the crank pin with respect to the crank shaft.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
US00229317A 1971-05-26 1972-02-25 Two-stroke internal combustion engines Expired - Lifetime US3771503A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1730571 1971-05-26

Publications (1)

Publication Number Publication Date
US3771503A true US3771503A (en) 1973-11-13

Family

ID=10092854

Family Applications (1)

Application Number Title Priority Date Filing Date
US00229317A Expired - Lifetime US3771503A (en) 1971-05-26 1972-02-25 Two-stroke internal combustion engines

Country Status (4)

Country Link
US (1) US3771503A (enExample)
JP (1) JPS5333688B1 (enExample)
GB (1) GB1337474A (enExample)
IT (1) IT956216B (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11255321B1 (en) * 2019-04-30 2022-02-22 Northwest Uld, Inc. UAV propulsion system with dual rotary valves and multi-compartment crankcase

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4266514A (en) * 1979-08-06 1981-05-12 Brunswick Corporation Intake manifold system for a two-cycle V-engine
JPS63162087A (ja) * 1986-12-25 1988-07-05 アイシン精機株式会社 かんばん自動洗浄乾燥機

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US974544A (en) * 1910-11-01 John W Akerman Internal-combustion engine.
US1336232A (en) * 1920-04-06 oe geneva
US2265677A (en) * 1939-03-24 1941-12-09 Robert W Baird Fuel injection, compression ignition, oil engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US974544A (en) * 1910-11-01 John W Akerman Internal-combustion engine.
US1336232A (en) * 1920-04-06 oe geneva
US2265677A (en) * 1939-03-24 1941-12-09 Robert W Baird Fuel injection, compression ignition, oil engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11255321B1 (en) * 2019-04-30 2022-02-22 Northwest Uld, Inc. UAV propulsion system with dual rotary valves and multi-compartment crankcase

Also Published As

Publication number Publication date
GB1337474A (en) 1973-11-14
JPS5333688B1 (enExample) 1978-09-16
IT956216B (it) 1973-10-10

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