EP1317606A1 - Two cycle engine having minimal lubrication - Google Patents
Two cycle engine having minimal lubricationInfo
- Publication number
- EP1317606A1 EP1317606A1 EP01974251A EP01974251A EP1317606A1 EP 1317606 A1 EP1317606 A1 EP 1317606A1 EP 01974251 A EP01974251 A EP 01974251A EP 01974251 A EP01974251 A EP 01974251A EP 1317606 A1 EP1317606 A1 EP 1317606A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oil
- stroke engine
- piston
- cylinder
- housing
- 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
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
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
-
- 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
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
- F01M2001/083—Lubricating systems characterised by the provision therein of lubricant jetting means for lubricating 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
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
Definitions
- the invention relates to a two-stroke engine according to the preamble of claim 1 and a working device using the two-stroke engine.
- Such two-stroke engines are preferred because of their high specific power, position-independent usability and their low weight in work tools, especially hand-held tools.
- two principles are known for the lubrication of two-stroke engines, namely a mixture lubrication, in which oil is added to the fuel in a mixture ratio of 1:25 to 1: 100, and a separate lubrication, in which oil from a separate oil tank is supplied by a Oil pump is pumped into the crankcase or the carburetor socket. Both lubrication methods support the position-independent usability and the low weight of the two-stroke engines.
- the invention has for its object to provide a two-stroke engine with reduced lubricating oil requirements.
- the two-stroke engine is characterized in that the oil in the form of an oil aerosol on a tread of a piston skirt of the piston and can be applied to a running surface of the cylinder.
- the oil can be applied to a running surface, that is to say an outer surface of a piston skirt of the piston and / or to a running surface of the cylinder, for which purpose a suitable oil outlet should suitably be provided in or below the running surface of the cylinder.
- the oil can then be discharged in time with the engine in such a way that oil is first applied to the running surface of the piston skirt when the piston is in the region of its bottom dead center, and later, when the piston reaches its top dead center, wetting the running surface of the cylinder.
- the oil aerosol can either be generated by the oil outlet itself or can already be supplied to the oil outlet as an oil aerosol.
- the oil outlet is designed in the form of an inclined nozzle directed into the cylinder.
- the effect of the nozzle then extends into the cylinder, although the nozzle can be arranged below the tread of the cylinder.
- the nozzle is able to wet the inner surface (running surface) of the cylinder with oil.
- An improvement in the economical handling of the lubricating oil is possible according to the invention if the discharge of oil from the oil outlet can be controlled as a function of a load condition of the two-stroke engine. For example, idle operation can take place without any supply of lubricating oil, while an increased supply of oil may be required in full-load operation can to protect the highly stressed components.
- the two-stroke engine according to the invention is used particularly advantageously in an implement, in particular a hand-held implement, in which the two-stroke engine is coupled to a movement converting device arranged in a housing and the two-stroke motor can be lubricated by oil from the housing of the movement converting device.
- the two-stroke engine can even be lubricated exclusively by the oil from the housing, without additional lubricating oil being required, for example in a separate oil tank or by adding it to the fuel.
- the lean or minimal lubrication system significantly reduces the weight of the two-stroke engine and thus the implement. Furthermore, customary measures, such as the preparation of the oil / fuel mixture, the provision, cleaning and maintenance of a separate oil tank or the monitoring of the oil supply by appropriate facilities, are no longer necessary.
- the construction of the two-stroke engine can be significantly simplified, which also increases its reliability.
- Figure 1 shows a section through an inventive two-stroke engine, with a piston at bottom dead center
- Figure 2 shows a section according to Figure 1, wherein the piston is just before top dead center
- FIG. 3 schematically shows the construction of a working device using the two-stroke engine according to the invention.
- Figures 1 and 2 each show a two-stroke engine 1 according to the invention, with a cylinder 2 and a piston 3 movable in the cylinder 2, which rotates a crankshaft or drive shaft 5 in a known manner via a connecting rod 4.
- a two-stroke engine 1 known to date is often used as a two-stroke engine in hand-held tools, such as rammers, for soil compaction.
- a spark plug 7 is inserted, which generates a spark in a combustion chamber 8 at a given time, as a result of which the air-fuel mixture compressed by the upward movement of piston 3 burns and piston 3 downwards, drives in the direction of its bottom dead center shown in Figure 1 and thereby drives the drive shaft 5 rotating.
- the piston 3 consists essentially of a lower part, which is also referred to as a piston skirt or piston skirt 9, and an upper part, which is referred to as a piston head and in the circumference of which piston rings 10 are inserted.
- the entire cylindrical outer surface of the piston 3 is referred to as the running surface.
- the part of the cylindrical inner surface of the cylinder 2 is referred to as the running surface 11 of the cylinder 2, on which the piston 3 and the piston rings 10 slide.
- a nozzle 12 serving as an oil outlet is inserted at an angle such that its spraying direction extends into the cylinder 2. Oil can thus be brought into the cylinder 2 and above all onto its running surface 11 via the nozzle 12, as can be seen for example from FIG. Alternatively, the nozzle 12 can also be formed in the tread 11 of the cylinder 2.
- the wetting of the running surface 11 of the cylinder 2 presupposes that the piston 3 is in the vicinity of its top dead center position shown in FIG.
- the piston 3 reaches its bottom dead center position shown in FIG. 1, it covers the running surface 11 of the cylinder 2 in such a way that it can no longer be wetted with oil through the nozzle 12. Instead, however, part of the piston skirt 9 is exposed, so that oil now comes out of the nozzle 12 can wet the piston skirt 9.
- the oil supply by means of the nozzle 12 can take place continuously or in pulses, a control according to the position of the piston 3 or also taking into account the operating state of the two-stroke engine 1 is particularly advantageous.
- a particularly effective lubrication is possible if the oil is supplied not as a liquid but as an oil aerosol or mist.
- the finest droplets allow a wide distribution of the oil without affecting the lubricating effect.
- the oil is supplied in liquid form to the nozzle 12 and is atomized there under pressure.
- the oil it is possible for the oil to be supplied to the nozzle 12 or a correspondingly designed outlet as an oil aerosol and then only to be directed onto the running surface 11 of the cylinder 2 or the piston skirt 9.
- nozzle 12 As an alternative to the nozzle 12 or a corresponding non-pressurized outlet, it is also possible to provide a plurality of outlets or nozzles, for example in the form of a nozzle ring, in order to allow oil to penetrate into the tread 11 of the cylinder 2 from below.
- the amount of oil supplied should be such that a Lubrication of the piston 3 in the cylinder 2 is reliably possible. Leakage of the oil into the combustion chamber 8 or into a crank chamber 13 lying under the piston 3 should, however, be avoided in order to minimize the oil consumption. Accordingly, it may be necessary for other moving parts of the two-stroke engine 1, in particular connecting rod bearings, to have separate lubrication, for example permanent lubrication, which is independent of the oil lubrication of the piston 3, or to be made from suitable materials.
- the oil supply is to be adjusted in such a way that the piston rings 10 remain movable and cannot get stuck in the ring grooves receiving them due to insufficient lubrication.
- the two-stroke engine according to the invention can be used particularly advantageously in an implement, in particular a manually operable implement, as is shown schematically in FIG. 3.
- the two-stroke engine 1 is outlined in the left part of FIG. 3. Its drive shaft 5 extends from the housing of the two-stroke engine 1 into a housing 14 which surrounds a movement converting device 15.
- the movement conversion device 15 can have different types of gear drives, cam drives, etc. and essentially serves to convert movement directions, types of movement (translational, rotary; continuous, intermittent, oscillating, shock-like, etc.) and movement speeds.
- the movement converting device 15 is only sketched schematically in FIG. 3 in the form of a gearwheel and a dashed frame surrounding it.
- the moving components of the movement conversion device 15 are lubricated by oil filled into the housing 14, which is symbolized in FIG. 3 by an oil sump 16.
- oil from the oil sump 16 is constantly flung and swirled in the form of large and small droplets. After a short time, an oil mist made of the finest oil droplets is formed in the housing 14 and wets all parts to be lubricated.
- a part of the oil aerosol is collected by a collecting device 17, which essentially represents an opening in the housing 14, into which the oil aerosol can enter. If necessary, filters or porous sponge-like materials can be provided at this point to filter the oil aerosol.
- the oil aerosol is guided from the collecting device 17 to the nozzle 12 serving as an oil outlet via a conveying device 18.
- the conveying device 18 can be designed in many different ways and, depending on the design of the lubrication system, can transport the oil in liquid form or as an oil aerosol without pressure or under pressure.
- the two-stroke engine 1 is lubricated exclusively by the oil from the housing 14.
- An additional oil supply as in the prior art is therefore no longer necessary. There is no need to fill up an oil-fuel mixture or to provide a separate oil tank.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10045725 | 2000-09-15 | ||
DE10045725A DE10045725B4 (en) | 2000-09-15 | 2000-09-15 | Two-stroke engine with oil lubrication |
PCT/EP2001/010602 WO2002023016A1 (en) | 2000-09-15 | 2001-09-13 | Two cycle engine having minimal lubrication |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1317606A1 true EP1317606A1 (en) | 2003-06-11 |
EP1317606B1 EP1317606B1 (en) | 2006-06-21 |
Family
ID=7656353
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01974251A Expired - Lifetime EP1317606B1 (en) | 2000-09-15 | 2001-09-13 | Two cycle engine having minimal lubrication |
Country Status (5)
Country | Link |
---|---|
US (1) | US6932046B2 (en) |
EP (1) | EP1317606B1 (en) |
JP (1) | JP2004509261A (en) |
DE (2) | DE10045725B4 (en) |
WO (1) | WO2002023016A1 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1325358C (en) * | 2001-12-13 | 2007-07-11 | 普费菲孔施陶卜里股份公司 | Method and device for connecting a plurality of threads, especially the ends of threads |
US20040198464A1 (en) * | 2003-03-04 | 2004-10-07 | Jim Panian | Wireless communication systems for vehicle-based private and conference calling and methods of operating same |
DE102004019630A1 (en) | 2004-04-22 | 2005-11-17 | Wacker Construction Equipment Ag | Oil supply for an internal combustion engine |
US7360511B2 (en) | 2004-06-10 | 2008-04-22 | Achates Power, Inc. | Opposed piston engine |
US7156056B2 (en) | 2004-06-10 | 2007-01-02 | Achates Power, Llc | Two-cycle, opposed-piston internal combustion engine |
US20070017803A1 (en) * | 2005-07-22 | 2007-01-25 | Heraeus, Inc. | Enhanced sputter target manufacturing method |
US7475666B2 (en) * | 2006-09-07 | 2009-01-13 | Heimbecker John A | Stroke control assembly |
US20080060628A1 (en) * | 2006-09-07 | 2008-03-13 | Heimbecker John A | Self-lubricating piston |
DE102008035084A1 (en) * | 2008-07-28 | 2010-02-04 | Wacker Neuson Se | Impact device with impact mechanism lubricator |
US8539918B2 (en) * | 2009-02-20 | 2013-09-24 | Achates Power, Inc. | Multi-cylinder opposed piston engines |
US9328692B2 (en) * | 2009-02-20 | 2016-05-03 | Achates Power, Inc. | Opposed piston engines with controlled provision of lubricant for lubrication and cooling |
US8550041B2 (en) * | 2009-02-20 | 2013-10-08 | Achates Power, Inc. | Cylinder and piston assemblies for opposed piston engines |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1603173A (en) * | 1924-12-06 | 1926-10-12 | Miller Improved Gas Engine Com | Internal-combustion engine |
DE833880C (en) * | 1949-11-01 | 1952-03-13 | Willy Lehmann | Additional lubrication for working piston |
US3204619A (en) * | 1962-07-02 | 1965-09-07 | American Mach & Foundry | Internal combustion engine |
GB1296830A (en) * | 1969-02-21 | 1972-11-22 | ||
JPS6220611A (en) * | 1985-07-19 | 1987-01-29 | Honda Motor Co Ltd | Lubricating device for 2-cycle engine |
GB2211581B (en) * | 1987-11-06 | 1991-11-06 | Ind Tech Res Inst | A lubricating device for two-stroke engine |
DE4034162C1 (en) * | 1990-10-26 | 1992-06-04 | Michael L. 8830 Treuchtlingen De Zettner | |
US5241932A (en) * | 1991-12-02 | 1993-09-07 | Ryobi Outdoor Products | Operator carried power tool having a four-cycle engine |
DE4243571C2 (en) | 1992-12-22 | 1997-05-28 | Opel Adam Ag | Oil supply for the piston of a reciprocating piston internal combustion engine |
JPH06229219A (en) | 1993-02-03 | 1994-08-16 | Yamaha Motor Co Ltd | Lubricating device for two-cycle engine |
DE4323262A1 (en) * | 1993-07-12 | 1995-01-26 | Fev Motorentech Gmbh & Co Kg | Method and arrangement for supplying lubricant to a reciprocating piston machine |
US5375573A (en) * | 1993-09-09 | 1994-12-27 | Ford Motor Company | Lubrication of two-stroke internal combustion engines |
US5581891A (en) * | 1994-08-12 | 1996-12-10 | Black & Decker Inc. | Hedge trimmer with combination shearing and sawing blade assembly |
EP0781901A1 (en) * | 1995-12-29 | 1997-07-02 | Yamaha Hatsudoki Kabushiki Kaisha | Lubrication arrangement for engines |
US5826556A (en) * | 1997-04-24 | 1998-10-27 | Brunswick Corporation | Engine lubrication circuit with alternating lubrication paths |
IT1298936B1 (en) * | 1998-02-23 | 2000-02-07 | Gilardoni Vittorio S P A | METHOD AND DEVICE FOR INJECTING FUEL AND / OR LUBRICANT FLUIDS IN AN INTERNAL COMBUSTION ENGINE |
ES2197686T3 (en) * | 1998-11-05 | 2004-01-01 | Hans Jensen Lubricators A/S | LUBRICATION SYSTEM FOR LARGE DIESEL ENGINES. |
WO2000053900A1 (en) | 1999-03-11 | 2000-09-14 | Outboard Marine Corporation | Oil injection system |
-
2000
- 2000-09-15 DE DE10045725A patent/DE10045725B4/en not_active Expired - Fee Related
-
2001
- 2001-09-13 JP JP2002527638A patent/JP2004509261A/en active Pending
- 2001-09-13 DE DE50110278T patent/DE50110278D1/en not_active Expired - Lifetime
- 2001-09-13 EP EP01974251A patent/EP1317606B1/en not_active Expired - Lifetime
- 2001-09-13 US US10/363,845 patent/US6932046B2/en not_active Expired - Fee Related
- 2001-09-13 WO PCT/EP2001/010602 patent/WO2002023016A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO0223016A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2004509261A (en) | 2004-03-25 |
DE10045725B4 (en) | 2005-05-04 |
DE10045725A1 (en) | 2002-04-04 |
US6932046B2 (en) | 2005-08-23 |
DE50110278D1 (en) | 2006-08-03 |
EP1317606B1 (en) | 2006-06-21 |
US20040011308A1 (en) | 2004-01-22 |
WO2002023016A1 (en) | 2002-03-21 |
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