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1. WO2000040843 - TWO CYCLE ENGINE WITH A STRATIFIED CHARGE

Publication Number WO/2000/040843
Publication Date 13.07.2000
International Application No. PCT/EP2000/000067
International Filing Date 07.01.2000
Chapter 2 Demand Filed 02.08.2000
IPC
F02B 25/22 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
25Engines characterised by using fresh charge for scavenging cylinders
20Means for reducing the mixing of charge and combustion residues or for preventing escape of fresh charge through outlet ports, not provided for in, or of interest apart from, groups F02B25/02-F02B25/18234
22by forming air cushion between charge and combustion residues
F02B 63/02 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
63Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
02for hand-held tools
F02B 75/02 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
75Other engines, e.g. single-cylinder engines
02Engines characterised by their cycles, e.g. six-stroke
CPC
F02B 2075/025
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
75Other engines
02Engines characterised by their cycles, e.g. six-stroke
022having less than six strokes per cycle
025two
F02B 2075/027
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
75Other engines
02Engines characterised by their cycles, e.g. six-stroke
022having less than six strokes per cycle
027four
F02B 25/22
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
25Engines characterised by using fresh charge for scavenging cylinders
20Means for reducing the mixing of charge and combustion residues or for preventing escape of fresh charge through outlet ports not provided for in, or of interest apart from, subgroups F02B25/02 - F02B25/18
22by forming air cushion between charge and combustion residues
F02B 63/02
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
63Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
02for hand-held tools
Applicants
  • ANDREAS STIHL AG & CO. [DE/DE]; Badstrasse 115 D-71336 Waiblingen, DE (AllExceptUS)
  • ROSSKAMP, Heiko [DE/DE]; DE (UsOnly)
  • NICKEL, Hans [DE/DE]; DE (UsOnly)
  • KLIMMEK, Axel [DE/DE]; DE (UsOnly)
  • STARK, Thomas [DE/DE]; DE (UsOnly)
  • PRETZSCH, Axel [DE/DE]; DE (UsOnly)
Inventors
  • ROSSKAMP, Heiko; DE
  • NICKEL, Hans; DE
  • KLIMMEK, Axel; DE
  • STARK, Thomas; DE
  • PRETZSCH, Axel; DE
Agents
  • WASMUTH, Rolf ; Menzelstrasse 40 D-70192 Stuttgart, DE
Priority Data
199 00 445.508.01.1999DE
Publication Language German (DE)
Filing Language German (DE)
Designated States
Title
(DE) ZWEITAKTMOTOR MIT LADUNGSSCHICHTUNG
(EN) TWO CYCLE ENGINE WITH A STRATIFIED CHARGE
(FR) MOTEUR DEUX TEMPS A STRATIFICATION DE LA CHARGE
Abstract
(DE)
Die Erfindung betrifft einen Zweitaktmotor als Antriebsmotor in einem tragbaren, handgeführten Arbeitsgerät. Der in einem Zylinder (2) ausgebildete Brennraum (3) ist von einem auf- und abgehenden Kolben (5) begrenzt, wobei der Kolben (5) über ein Pleuel (6) eine in einem Kurbelgehäuse (4) drehbar gelagerte Kurbelwelle (7) antreibt. Der Brennraum (3) weist einen Auslass (10) zum Abströmen der Abgase auf und zur Zufuhr eines von einer Gemischaufbereitungseinrichtung (8) bereitgestellten Kraftstoff/Luft-Gemisches und Verbrennungsluft in den Brennraum (3) mündende gaszuführende Kanäle (12, 15) vorgesehen sind. Um die Spülverluste zu senken, ist vorgesehen, dass über die gesamte Dauer des Gaswechsels im auslassnahen Bereich ausschliesslich Luft und im auslassfernen Bereich ausschliesslich Kraftstoff/Luft-Gemisch aus dem Kurbelgehäuse (4) übertritt.
(EN)
The invention relates to a two cycle engine for use as a driving engine in a portable, hand-controlled tool. The combustion chamber (83), which is configured in a cylinder (2), is delimited by a piston (5) which rises and falls. Said piston (5) drives a crankshaft (7) by means of a connecting rod (6), said crankshaft being rotationally mounted in a crankcase (4). The combustion chamber (3) has an outlet (10) for outflowing waste gases and gas-supplying channels (12, 15) which open into the combustion chamber (3) are provided for supplying an air-fuel mixture provided by a mixture-preparing device (8) and combustion air. According to the invention, only air blows by from the crankcase (4) in the proximity of the outlet and only the air-fuel mixture blows by from the crankcase (4) in the area further away from the outlet, for the entire duration of the gas exchange process, in order to reduce scavenging losses.
(FR)
L'invention concerne un moteur deux temps utilisé comme moteur d'entraînement dans un outillage portable guidé à la main. La chambre de combustion (3) conçue dans un cylindre (2) est délimitée par un piston ascendant et descendant (5). Le piston (5) entraîne, par une bielle (6), un vilebrequin (7) monté pivotant dans un boîtier (4) par une bielle (6). La chambre de combustion (3) présente une sortie (10) destinée à l'écoulement des gaz de combustion et à l'apport d'un mélange air/carburant qui est préparé par le dispositif de préparation de mélange (8), et d'air de combustion dans les canaux (12, 15) acheminant le gaz et aboutissant dans la chambre à combustion (3). Pour réduire les pertes de rinçage, sortent du boîtier (4) pendant toute la durée de l'échange gazeux exclusivement de l'air dans la zone proche de la sortie et exclusivement le mélange carburant/air dans la zone éloignée de la sortie.
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