GB2339844A - Quieter parallel-twin four-stroke i.c. engine with additional expansion cylinder - Google Patents

Quieter parallel-twin four-stroke i.c. engine with additional expansion cylinder Download PDF

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Publication number
GB2339844A
GB2339844A GB9816325A GB9816325A GB2339844A GB 2339844 A GB2339844 A GB 2339844A GB 9816325 A GB9816325 A GB 9816325A GB 9816325 A GB9816325 A GB 9816325A GB 2339844 A GB2339844 A GB 2339844A
Authority
GB
United Kingdom
Prior art keywords
exhaust
parallel
twin
stroke
cylinder
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Withdrawn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
GB9816325A
Other versions
GB9816325D0 (en
Inventor
John Eric Dowell
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 GB9816325A priority Critical patent/GB2339844A/en
Publication of GB9816325D0 publication Critical patent/GB9816325D0/en
Publication of GB2339844A publication Critical patent/GB2339844A/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Withdrawn legal-status Critical Current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
    • F02B41/00—Engines characterised by special means for improving conversion of heat or pressure energy into mechanical power
    • F02B41/02—Engines with prolonged expansion
    • F02B41/06—Engines with prolonged expansion in compound cylinders
    • 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

Description

4- 2339844 QUIEETER PARALLEL-TWIN FOUR-STROKE ENGINE This invention
relates to the parallel twin four-stroke internal combustion engine using pistons that move together with a common crank angle and fire alternately.
The parallel twin four-stroke engines are used in motorbikes and in auxiliary power units. They are usually noticeable because of the noise. They do vibrate and shake the object they are attached to.
According to the present invention a parallel-twin four-stroke internal combustion engine is modified so that the exhaust gasses are kept to do more work in a main power cylinder and in an additional third cylinder, whose piston lags behind half a stroke, by means of valves and passages, before being released to exhaust.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which:- Figure I shows a parallel-twin four-stroke engine with connecting exhaust reuse passage with valve, a third cylinder and it's exhaust port.
Referring to the drawing, as the crankshaft 10 rotates clockwise, a main piston I I moves upwards in it's cylinder 12, past the exhaust reuse valve 13, and completes the compression stroke. It then moves downward on the power stroke. Meanwhile the third piston 17 has pushed some exhaust gas out the exhaust port 16 and compressed the remaining exhaust gas into the exhaust reuse passage 14 and the end of the second cylinder 15.
As the main piston 11 exposes the exhaust reuse valve 13, the working gas mixes with the compressed gases to give a pressurized gas, which then works on both the main piston I I and on the third piston 17 until the third piston opens the exhaust port 15. The exhaust valve for the cylinder then opens as piston 11 is on it's exhaust stroke.
The second main piston, behind piston I I and parallel to it, is starting it's compression stroke. It has it's own exhaust reuse valve but uses the same exhaust reuse passage 14, cylinder 15, third piston 17 and exhaust port 16. The two main pistons alternate in using the third cylinder to expand their working gases before exhausting.
N. I - The exhaust reuse valve 13 may be actuated by the exhaust pressure from the main cylinder or may be power driven, it may also act as an inlet valve.

Claims (4)

  1. I A parallel-twin four-stroke internal combustion engine is modified so that the exhaust gasses are kept to do more work in a main power cylinder and in an additional third cylinder, whose piston lags behind by half a stroke, by means of valves and passages, before being released to exhaust.
  2. 2 A parallel-twin four-stroke internal combustion engine as claimed in Claim I wherein the valve in the exhaust reuse passage is operated by exhaust pressure from the main cylinder.
  3. 3 A parallel-twin four-stroke internal combustion engine as claimed in Claim I wherein the valve in the exhaust reuse passage is operated by mechanical means.
  4. 4 A parallel-twin four-stroke internal combustion engine as claimed in Claim 1 wherein the valve in the exhaust reuse passage is also used as an inlet valve.
GB9816325A 1998-07-24 1998-07-24 Quieter parallel-twin four-stroke i.c. engine with additional expansion cylinder Withdrawn GB2339844A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9816325A GB2339844A (en) 1998-07-24 1998-07-24 Quieter parallel-twin four-stroke i.c. engine with additional expansion cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9816325A GB2339844A (en) 1998-07-24 1998-07-24 Quieter parallel-twin four-stroke i.c. engine with additional expansion cylinder

Publications (2)

Publication Number Publication Date
GB9816325D0 GB9816325D0 (en) 1998-09-23
GB2339844A true GB2339844A (en) 2000-02-09

Family

ID=10836238

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9816325A Withdrawn GB2339844A (en) 1998-07-24 1998-07-24 Quieter parallel-twin four-stroke i.c. engine with additional expansion cylinder

Country Status (1)

Country Link
GB (1) GB2339844A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2450616A (en) * 2007-06-27 2008-12-31 Ivor Flaherty Internal combustion engine and method of operation

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB169799A (en) * 1920-07-03 1921-10-03 Waldo George Gernandt Improvements in internal combustion engines
GB243084A (en) * 1925-02-12 1925-11-26 Elias Delaroche Rendell Improvements in four stroke cycle compound internal combustion type fluid pressure engines
GB309009A (en) * 1928-01-02 1929-04-02 Harry Ralph Ricardo Improvements in or relating to compound internal combustion engines
GB529619A (en) * 1938-06-23 1940-11-25 Christian Wilhelm Paul Heyland Improvements relating to multi-stage internal combustion engines
GB2000224A (en) * 1977-06-20 1979-01-04 Martin J Compound internal combustion engine
EP0200714A2 (en) * 1985-04-02 1986-11-05 Dr. Brücker & Zeman SOFT COMBUSTION SYSTEMS Gesellschaft bürgerlichen Rechts Internal-combustion piston engine
EP0621403A1 (en) * 1993-04-20 1994-10-26 FIAT AUTO S.p.A. A three cylinder internal combustion engine with an intermediate feed and exhaust cylinder

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB169799A (en) * 1920-07-03 1921-10-03 Waldo George Gernandt Improvements in internal combustion engines
GB243084A (en) * 1925-02-12 1925-11-26 Elias Delaroche Rendell Improvements in four stroke cycle compound internal combustion type fluid pressure engines
GB309009A (en) * 1928-01-02 1929-04-02 Harry Ralph Ricardo Improvements in or relating to compound internal combustion engines
GB529619A (en) * 1938-06-23 1940-11-25 Christian Wilhelm Paul Heyland Improvements relating to multi-stage internal combustion engines
GB2000224A (en) * 1977-06-20 1979-01-04 Martin J Compound internal combustion engine
EP0200714A2 (en) * 1985-04-02 1986-11-05 Dr. Brücker & Zeman SOFT COMBUSTION SYSTEMS Gesellschaft bürgerlichen Rechts Internal-combustion piston engine
EP0621403A1 (en) * 1993-04-20 1994-10-26 FIAT AUTO S.p.A. A three cylinder internal combustion engine with an intermediate feed and exhaust cylinder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2450616A (en) * 2007-06-27 2008-12-31 Ivor Flaherty Internal combustion engine and method of operation

Also Published As

Publication number Publication date
GB9816325D0 (en) 1998-09-23

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Legal Events

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