EP0312162A2 - Zweitakt-Brennkraftmaschine - Google Patents

Zweitakt-Brennkraftmaschine Download PDF

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Publication number
EP0312162A2
EP0312162A2 EP88202227A EP88202227A EP0312162A2 EP 0312162 A2 EP0312162 A2 EP 0312162A2 EP 88202227 A EP88202227 A EP 88202227A EP 88202227 A EP88202227 A EP 88202227A EP 0312162 A2 EP0312162 A2 EP 0312162A2
Authority
EP
European Patent Office
Prior art keywords
piston
skirt
crown member
skirt portion
crown
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.)
Granted
Application number
EP88202227A
Other languages
English (en)
French (fr)
Other versions
EP0312162B1 (de
EP0312162A3 (en
Inventor
Christopher Robin Harland
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 Technology Ltd
Original Assignee
T&N Technology 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 T&N Technology Ltd filed Critical T&N Technology Ltd
Publication of EP0312162A2 publication Critical patent/EP0312162A2/de
Publication of EP0312162A3 publication Critical patent/EP0312162A3/en
Application granted granted Critical
Publication of EP0312162B1 publication Critical patent/EP0312162B1/de
Expired 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
    • F02F3/00—Pistons 
    • F02F3/24—Pistons  having means for guiding gases in cylinders, e.g. for guiding scavenging charge in two-stroke engines
    • 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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/18—Other cylinders
    • F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging
    • 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
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • 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

Definitions

  • the present invention relates to pistons and partic­ularly, though not exclusively, to pistons for two-stroke engines.
  • a piston includes a crown member and a skirt, the skirt comprising an axially extending, uninterrupted skirt portion depending from the crown member on at least that part of the piston which traverses the exhaust port of a co-operating cylin­der and a skirt portion which is axially spaced apart from the crown member on at least part of the area of the piston which traverses the transfer port or ports of the co-operating cylinder.
  • the spaced-apart skirt portion may allow charge circulation around all the transfer ports, if the engine has more than one, or around only a proportion of the transfer ports.
  • the spaced-apart skirt portion may be formed by forming an aperture in the skirt of a conventional full skirted piston.
  • the spaced-apart skirt portion comprises a skirt land supported on struts depending from the gudgeon pin bosses. This has been found to provide a stronger piston than that produced by opening up of a conventional full-skirted piston.
  • Pistons according to the present invention may also be lighter and have lower friction in operation.
  • the uninterrupted skirt portion may depend from the crown and may be additionally supported by the gudgeon pin bosses from ribs or webs etc. extending therebetween.
  • a further advantage conferred by a piston according to the invention is that increased turbulence in the fresh charge may enhance mixing of the fuel, oil and air components producing enhanced combustion.
  • Figures 1 and 2 show a piston.
  • the piston comprises a crown member 11 having one or more piston ring grooves and piston rings 12. Gudgeon-pin bosses 13 depend general­ly from the crown member 11. Depending from the bosses 13 is a skirt land 14 supported by strut members 15 therebetween. On the opposite side of the piston the skirt is an axially extending, uninterrupted portion 16 depending from the crown 11 and further supported by the gudgeon pin bosses 13.
  • the piston is connected to a crankshaft 17 by a connecting rod 18 (shown in part).
  • Axially extending between the skirt land 14 and the crown member is a clear space 20 which in radial extent encompasses the cylinder transfer parts as will be shown below.
  • Figures 3, 4 and 5 show the piston 10 in a cylinder 22 having transfer passages 23 with ports 24 opening into the cylinder volume 25 and an exhaust port and passage 26.
  • the incoming charge 28 of fuel, air and oil enters the engine crankcase region 29 from a suitable carburettor (not shown) and porting 30.
  • the charge 28 is drawn into the crankcase 29 and due to the piston clear space 20 is able to circulate within the crankcase 29, the transfer passages 23 and in the space below the crown 11.
  • Arrows and curved lines 32 indicate circulation of charge.
  • the effect of charge circulation under the crown 11 is to improve cooling of the crown and lubrication of the small-end bearing. Enhanced turbulence may also improve mixing of the charge constituents.
  • the skirt portion 16 main­tains the exhaust port 26 closed to the crankcase whilst the piston is on the induction and compression stroke.
  • the piston behaves in the normal manner of a two-stroke engine to compress the fuel charge in the crankcase 29 and expel it into the combustion volume via the ports 24 as they are uncovered by the piston. Firing and exhaust functions are as in a conventional two-stroke engine.
  • the piston shown in Figure 6 has the gudgeon pin bosses 13 depending from the crown 11 and the skirt portion 16 is largely self-supporting.
  • the piston above has a clear space 20 which allows charge circulation through all the transfer ports on the induction stroke, the clear space in other pistons may only extend to uncover part of the total transfer port area.
  • the engine inlet porting could be by reed valve, disc valve or piston controlled induction, for example.
  • the piston of the present invention may be used with fuel injection, only air being admitted via the induction and transfer porting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP19880202227 1987-10-13 1988-10-06 Zweitakt-Brennkraftmaschine Expired EP0312162B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8724026 1987-10-13
GB878724026A GB8724026D0 (en) 1987-10-13 1987-10-13 Pistons

Publications (3)

Publication Number Publication Date
EP0312162A2 true EP0312162A2 (de) 1989-04-19
EP0312162A3 EP0312162A3 (en) 1989-08-30
EP0312162B1 EP0312162B1 (de) 1992-04-01

Family

ID=10625260

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880202227 Expired EP0312162B1 (de) 1987-10-13 1988-10-06 Zweitakt-Brennkraftmaschine

Country Status (3)

Country Link
EP (1) EP0312162B1 (de)
DE (1) DE3869725D1 (de)
GB (2) GB8724026D0 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19538407A1 (de) * 1995-10-16 1997-04-17 Mahle Gmbh Gegossener Leichmetallkolben für einen 2-Takt-Motor
WO1999034109A1 (en) * 1997-12-30 1999-07-08 Ab Volvo Internal combustion engine
FR2840023A1 (fr) * 2002-05-24 2003-11-28 Stihl Ag & Co Kg Andreas Moteur a deux temps
EP2470812A4 (de) * 2009-08-27 2015-04-08 Federal Mogul Products Inc Monolithischer kolben mit niedrigreibungsschaft

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR545665A (fr) * 1922-01-06 1922-10-18 Piston pour moteurs à explosion à deux temps
GB308506A (en) * 1928-05-02 1929-03-28 Butterfields Ltd Improvements in the manufacture of pistons
FR1489476A (fr) * 1966-08-12 1967-07-21 Trw Inc Piston de moteur à jupe ondulée et à fonctionnement silencieux
BE758114A (fr) * 1969-10-29 1971-04-01 Emmaboda Glasverk Ab Prefectionnements aux pinces a vis pour empaqueter les feuillesde verr
GB8423050D0 (en) * 1984-09-12 1984-10-17 Ae Plc Pistons

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19538407A1 (de) * 1995-10-16 1997-04-17 Mahle Gmbh Gegossener Leichmetallkolben für einen 2-Takt-Motor
US5979391A (en) * 1995-10-16 1999-11-09 Mahle Gmbh Cast light metal piston for a two-stroke engine
WO1999034109A1 (en) * 1997-12-30 1999-07-08 Ab Volvo Internal combustion engine
FR2840023A1 (fr) * 2002-05-24 2003-11-28 Stihl Ag & Co Kg Andreas Moteur a deux temps
US6895910B2 (en) 2002-05-24 2005-05-24 Andreas Stihl Ag & Co. Kg Two-cycle engine having scavenging
EP2470812A4 (de) * 2009-08-27 2015-04-08 Federal Mogul Products Inc Monolithischer kolben mit niedrigreibungsschaft

Also Published As

Publication number Publication date
GB8724026D0 (en) 1987-11-18
EP0312162B1 (de) 1992-04-01
GB2210951B (en) 1992-01-29
DE3869725D1 (de) 1992-05-07
GB2210951A (en) 1989-06-21
EP0312162A3 (en) 1989-08-30
GB8823517D0 (en) 1988-11-16

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