CA2251764A1 - Hand-guided appliance with an internal combustion engine with direct electronic injection - Google Patents
Hand-guided appliance with an internal combustion engine with direct electronic injection Download PDFInfo
- Publication number
- CA2251764A1 CA2251764A1 CA002251764A CA2251764A CA2251764A1 CA 2251764 A1 CA2251764 A1 CA 2251764A1 CA 002251764 A CA002251764 A CA 002251764A CA 2251764 A CA2251764 A CA 2251764A CA 2251764 A1 CA2251764 A1 CA 2251764A1
- Authority
- CA
- Canada
- Prior art keywords
- hand
- operated tool
- tool according
- fuel injection
- fuel
- 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.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
- F02M53/04—Injectors with heating, cooling, or thermally-insulating means
- F02M53/08—Injectors with heating, cooling, or thermally-insulating means with air cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B17/00—Chain saws; Equipment therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P1/00—Air cooling
- F01P1/02—Arrangements for cooling cylinders or cylinder heads, e.g. ducting cooling-air from its pressure source to cylinders or along 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
- 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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/20—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines characterised by means for preventing vapour lock
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/04—Injectors peculiar thereto
- F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
- F02M69/54—Arrangement of fuel pressure regulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P1/00—Air cooling
- F01P1/06—Arrangements for cooling other engine or machine parts
- F01P1/10—Arrangements for cooling other engine or machine parts for cooling fuel injectors or sparking-plugs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
-
- 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
Abstract
In order to improve a hand-guided appliance with a two-stroke internal combustion engine with direct electronic fuel injection in such a way that the fuel injection is optimised, it is proposed to fit a partition (19) bordering the cylinder (15) which separates the adjacent intake chamber from the cooling air guide and to fit the fuel injection valve (17) above the intake port of the cylinder (15) passing through the partition (19).
Description
CA 022~1764 1998-10-13 S,, C I F I C ~ I I 0 N
Hand-ocerated tool with an internal combustion engine with electronic direct injection TECHNICALAREA
The invention reLates to a hanc-operated tool, more particu-larly cutting bisks, brush cutters or the like, with an i1-ternal combustion engine, preferably a two-stroke ensine with electronic direct injection of the fuel, which is pro-vided with a cooling fan dis~osed on the crankshaft and, within the area of the cylinder, with a cooling air guicance means which brings about a flow along the crankshaft axis.
STATE OF THE ART
When fuel is injectec into the internal com~ustion engire, it is attempted to perform this in such a way that a gccc mixture preparation with a simu~taneous optimization of -,1e waste gas quality is achieved.
In the DE 41 42 354 A1, a tool is disclosed which ~ossesses a block of injection pumps that is secured to a moun~
plate separating the intake sec ion for the combustion a-r from the engine space. However, this leads to an incre_sed thermal stress of the injection ~ump block since the la-ter forms a compact unit with the mounting plate so that the waste heat from the engine space is passed on direct to the parts carrying fuel, whereby a gassing of the fuel re-sults.
Also from the DE 37 35 711 A1, a hand-operated tool is known.
In this tool, the injection pumo is flexibly connected with the engine so as to avoid mechanical and thermal stresses acting upon the injection pump. Elut it is preciselythe fle-xible connection which harbours new problems because the fle-xible pipeline makes an exact control diificult and since, on account of it being routed through non-cooled regions -close to the engine - the risk of the fuel being gassed li-kewise exists.
CA 022~l764 l998-l0-l3 DESCRIPTION OF THE INVENTION
That is why the tecrnicGl problem of the invention is .o oo i-mize two-stroke internal combustion engines of the type in question or their fuel injection.
This technical problem is resolved by the features characteri-zed in the Claim 1.
To this end provision is made according to the invention, par-ticularly in power cnain saws wherein the cylinder is disposed so as to be arrangec! vertically or inclined relative to the chain blade axis, for the intake chamber with the filter to he located on the side of the handle and for the coolins blowe~
f~ t~
CA 022~1764 1998-10-13 cooling air guicance means is alloca.ed to the cylinder, ;his brings about a flow alons the axis of the crankshc ~, ,or a partition adjacent to the cylinder se~aratins the continguous intake chamber from the cooling air guidance means and for dis~osing the fuel injection valve above tle inlet duct for the drawn-in air in the cylinder, by pre-,erance with an inclination toward the cylinder head and while penetrating the partition.
Preferably, an in.ake section secured to .he cylinder wi.h he inlet duct, is constructed so as to overlap the fuel injection valve above the inlet duc. and as a pressure ele-ment for the same.
According to a preferred embociiment, the intake sec~,on is equipped with current supply contacts for the elec.ronic_lly con.rolled ,uel injection valve, in which case tre int-k sec.ion can inc~rporate the fuel supply or ,uel evacua ion ,or the electromagnetically controlled fuel injec.ion valve.
Further,~ore, the intake sec.ion may be provided wi;h an air fil er and/or an air guidance path with a device or cooling the ,uel.
According to a further preferred embodiment, the intake sec-tion is equipped with â multipoint plug on an intake air housing, which also forms the partition to the cylinder, in .he operational state it is in engagement, while the intake air housing possesses the controller for supplying the internal combustion engine.
More especially a power chain saw, with an internal combus-tion engine and a fuel injection system is often--integra-ted into the housing of the tool, as well as the fuel tank and a supply container for lubricating oil and the cooling air guidance means.
.. , .. . . . .. .. . . , . . .. .. . . . . .. . ... .. . , . . . .. . .. . . ., .. .. . .. . . .. ..
_ . .
CA 022~1764 1998-10-13 In fuel injecrion systems in mctor vehicles it is known to dispose the Fressure controlLer in the fuel tank direc~
or in the region o, the fuel cistribution on the engine in ;heengine space.
In a hand-controlled tool, in order to arrange the pressure controller of the fuel pipe system of the fuel injection system of the internal comous.ion engine in a favorable manner from a spa ial, opera.ional and cooling-technic_l point of view, provision is made accordins to the inven ion for disposing the pressure con rol valve of the fuel injec-tion system in or on the fuel tank.
The pressure control valve is in this case prefercbly to be positioned in such a way ~.at the scme ccdi ionally pro-jects into the cis.ribu.~r s 5 ce of the cocling cir or is mounted in the same.
Advantageous fur-her develocments of the invention are chc-racterized in the subclcims.
eRrEF DESCRIPT ON OF THE DRA~-NGS
In the followins, embodiment examples of the invention are explained in greater detail wi h the aid OT the drawinss.
Thus:
F i 9. 1 shows in a schematic view a first embodiment of a power chain saw with the disposition of the pressure controller according to the invention;
F i 9. 2 shows in a schematic view a second embodiment of a power chain saw with the disposition of the pressure controller according to the invention;
F i 9. 3 shows in a schematic view a third embodiment of a power chain saw with the disposition of the pres-sure controller according to the invention, and . .. ., ~,,, , . ... , . . .. , . . . ~ .. ~ .. . . . .. . .. . .. .. . . . . . . ...
CA 022~l764 l998- l0- l3 ~ i 9. 4 shows in a schematic view a fourth embodlment of a power chain saw wi.h the disposition of the pres-sure con.roller accordirs to the invention BEST WAY OF REALIZING THE INVENTION
The power chain saw 1û depicteb in Fig. 1 is in a normal manner equipped with an internal combustion engine not shown in gre3-ter detail in a hcusing 11, a chain blade 12, a handle 13 and other fixtures.
On the top side 1L of the housing 11, the cylinder 15 projec.s, which, in the dirr-ction of the chain blade 12, supports an ex-haust 16 and, in .1e direction of the other side, a fuel in-jection valve 17 and an intake section 18. Between the cylin-der 15 and the fue~ injection valve 17 as well as .rhe intake section 18, a bulkheab wall 19 is located, which is consti.u-ted of an intake air housing 20 hith the inlet duc 15a anb the outlet duct 15b and a cooling air housing 21 for the cy-linder 15, in which case the inta~e air housing 20 is compri-sed of a housing cover 20a anc the housing bottom 20b.
The fuel injection valve 17 is cisposed above the intake sec-tion 18 so as to be directed cbliquely upwardly, while bo~h devices penetrate the partition 19.
The electronic controller 22 is mounted in the intake housing 2û. The intake section 18 is ~rovided with an air filter 23.
The throttle valve connection piece 24 is additionally mounted in the intake sec.ion 18.
With the aid of the waste gas sensor 25 disposed within the area of the exhaust 16 or inside the outlet duct 15b of the cylinder 15, it is possible to determine the waste gas tem-perature for the controller 22.
CA 022~1764 1998-10-13 An optimal operational behavior is achieved when the ,uel pump not shown in the drawinc in or on the ,uel tank 2~, is disposed in the intake air stream 27 or in the coolinc air stream 28.
The power chain saw 10 depic.ed in the Figs 2 through L j5 comprised of a basic housing 11, on which a handle 13 and the chain blace 1Z are dis~osed. Inside the basic housi,-g 11, the fuel tank 26, a supply container tor lubricating oil, the cooling air guicance means and the in.ernal co,-bus.ion engine are loca.ed, which are not illus.rated i~
greater detail here as well as other normal means. Loc- ed on the basic housing 11 or, rather, projecting from the same, is the cylinder 15, cn which the magne,ic injec~i~n valve 31 as well as a-mear,s ,or the in.ake o,~ combus.icn air are ciisposed.
The fuel tank 26 is providec on the side 38 of the bas housing 11 loca.ed opposi.e the chain blade 12 wi.hin . e area of the handle 13. The pressure controller 35 is p~ ced in .he basic housing 11, .o be more precise, in tha par., in which also the fuel tank 26 is to be found.
In the embodiment depicted in Fig.2, in the intake air housing 20 mounted on the basic housing 11, the intake sec-tion 32 with the fuel return pipe 34, an electronic consrol-ler 30 and the magnetic injection valve 31 are disposec.
Ihe pressure controller 35 of the fuel injection sys.em is, according to the invention, disposed externally on the 'uel tank 26 in the intake air stream 36. The air stream 29 is produced by the magnet wheel/fan wheel 28 and conducted from the basic housing 11 to the cooling air housing 37.
In the embodiment illustrated in the Fig.3, in contrast to the embodiment shown in the Fig.2, provision has been made . . ... . . . . .. . ..
for the pressur~ controller 3, of the fuel injec.ion system to be disposed sn .he e~.er or of the fuel tank 2~ in tne intake air s.re-m 36 and this, accordins to .'e inven~-lon, so as to projec~ in.o the ir,.ake air housing 20.
In the emoodiment depic.ed in Fig.4 on the otner hand, pro-vision has been made for the pressure controller 35 for the fuel injection sys.em to be dis~osed on the fuel tank 26, which is intesrated into the basic housing 11.
CA 022~1764 1998-10-13 ~, _ LIST OF REFEREi~C-- 'Jb'i~aERS
Power chain saw 10 housing 11 chain blade 12 handle 13 tG p side 1 L
cylinder 15 cylinder inlet duct 1Sa cylinder outlet duc. 1Sr.
exhaust 16 fuel injection valve 17 intake sec'ion 18 bulkhead wall 19 intake air housing 20.
intake air housing, cover 2Qa intake air housing, bc.-am 20r cooling air housing 21 electronic controllar 22 air filter 23 throttle valve connection F ~arr 24 waste gas sensor 25 fuel tank 2S
intake air stream 27 cooling air stream 28 magnet wheel/fan wheel 29 electronic controller 30 magnetic injection valve 31 intake section 32 fuel return flow pipe 34 pressure controller 35 intake air stream 36 cooling air housing 37 side 38 , .. .. .. . . . . . .. ... .. . . . . . . . .
Hand-ocerated tool with an internal combustion engine with electronic direct injection TECHNICALAREA
The invention reLates to a hanc-operated tool, more particu-larly cutting bisks, brush cutters or the like, with an i1-ternal combustion engine, preferably a two-stroke ensine with electronic direct injection of the fuel, which is pro-vided with a cooling fan dis~osed on the crankshaft and, within the area of the cylinder, with a cooling air guicance means which brings about a flow along the crankshaft axis.
STATE OF THE ART
When fuel is injectec into the internal com~ustion engire, it is attempted to perform this in such a way that a gccc mixture preparation with a simu~taneous optimization of -,1e waste gas quality is achieved.
In the DE 41 42 354 A1, a tool is disclosed which ~ossesses a block of injection pumps that is secured to a moun~
plate separating the intake sec ion for the combustion a-r from the engine space. However, this leads to an incre_sed thermal stress of the injection ~ump block since the la-ter forms a compact unit with the mounting plate so that the waste heat from the engine space is passed on direct to the parts carrying fuel, whereby a gassing of the fuel re-sults.
Also from the DE 37 35 711 A1, a hand-operated tool is known.
In this tool, the injection pumo is flexibly connected with the engine so as to avoid mechanical and thermal stresses acting upon the injection pump. Elut it is preciselythe fle-xible connection which harbours new problems because the fle-xible pipeline makes an exact control diificult and since, on account of it being routed through non-cooled regions -close to the engine - the risk of the fuel being gassed li-kewise exists.
CA 022~l764 l998-l0-l3 DESCRIPTION OF THE INVENTION
That is why the tecrnicGl problem of the invention is .o oo i-mize two-stroke internal combustion engines of the type in question or their fuel injection.
This technical problem is resolved by the features characteri-zed in the Claim 1.
To this end provision is made according to the invention, par-ticularly in power cnain saws wherein the cylinder is disposed so as to be arrangec! vertically or inclined relative to the chain blade axis, for the intake chamber with the filter to he located on the side of the handle and for the coolins blowe~
f~ t~
CA 022~1764 1998-10-13 cooling air guicance means is alloca.ed to the cylinder, ;his brings about a flow alons the axis of the crankshc ~, ,or a partition adjacent to the cylinder se~aratins the continguous intake chamber from the cooling air guidance means and for dis~osing the fuel injection valve above tle inlet duct for the drawn-in air in the cylinder, by pre-,erance with an inclination toward the cylinder head and while penetrating the partition.
Preferably, an in.ake section secured to .he cylinder wi.h he inlet duct, is constructed so as to overlap the fuel injection valve above the inlet duc. and as a pressure ele-ment for the same.
According to a preferred embociiment, the intake sec~,on is equipped with current supply contacts for the elec.ronic_lly con.rolled ,uel injection valve, in which case tre int-k sec.ion can inc~rporate the fuel supply or ,uel evacua ion ,or the electromagnetically controlled fuel injec.ion valve.
Further,~ore, the intake sec.ion may be provided wi;h an air fil er and/or an air guidance path with a device or cooling the ,uel.
According to a further preferred embodiment, the intake sec-tion is equipped with â multipoint plug on an intake air housing, which also forms the partition to the cylinder, in .he operational state it is in engagement, while the intake air housing possesses the controller for supplying the internal combustion engine.
More especially a power chain saw, with an internal combus-tion engine and a fuel injection system is often--integra-ted into the housing of the tool, as well as the fuel tank and a supply container for lubricating oil and the cooling air guidance means.
.. , .. . . . .. .. . . , . . .. .. . . . . .. . ... .. . , . . . .. . .. . . ., .. .. . .. . . .. ..
_ . .
CA 022~1764 1998-10-13 In fuel injecrion systems in mctor vehicles it is known to dispose the Fressure controlLer in the fuel tank direc~
or in the region o, the fuel cistribution on the engine in ;heengine space.
In a hand-controlled tool, in order to arrange the pressure controller of the fuel pipe system of the fuel injection system of the internal comous.ion engine in a favorable manner from a spa ial, opera.ional and cooling-technic_l point of view, provision is made accordins to the inven ion for disposing the pressure con rol valve of the fuel injec-tion system in or on the fuel tank.
The pressure control valve is in this case prefercbly to be positioned in such a way ~.at the scme ccdi ionally pro-jects into the cis.ribu.~r s 5 ce of the cocling cir or is mounted in the same.
Advantageous fur-her develocments of the invention are chc-racterized in the subclcims.
eRrEF DESCRIPT ON OF THE DRA~-NGS
In the followins, embodiment examples of the invention are explained in greater detail wi h the aid OT the drawinss.
Thus:
F i 9. 1 shows in a schematic view a first embodiment of a power chain saw with the disposition of the pressure controller according to the invention;
F i 9. 2 shows in a schematic view a second embodiment of a power chain saw with the disposition of the pressure controller according to the invention;
F i 9. 3 shows in a schematic view a third embodiment of a power chain saw with the disposition of the pres-sure controller according to the invention, and . .. ., ~,,, , . ... , . . .. , . . . ~ .. ~ .. . . . .. . .. . .. .. . . . . . . ...
CA 022~l764 l998- l0- l3 ~ i 9. 4 shows in a schematic view a fourth embodlment of a power chain saw wi.h the disposition of the pres-sure con.roller accordirs to the invention BEST WAY OF REALIZING THE INVENTION
The power chain saw 1û depicteb in Fig. 1 is in a normal manner equipped with an internal combustion engine not shown in gre3-ter detail in a hcusing 11, a chain blade 12, a handle 13 and other fixtures.
On the top side 1L of the housing 11, the cylinder 15 projec.s, which, in the dirr-ction of the chain blade 12, supports an ex-haust 16 and, in .1e direction of the other side, a fuel in-jection valve 17 and an intake section 18. Between the cylin-der 15 and the fue~ injection valve 17 as well as .rhe intake section 18, a bulkheab wall 19 is located, which is consti.u-ted of an intake air housing 20 hith the inlet duc 15a anb the outlet duct 15b and a cooling air housing 21 for the cy-linder 15, in which case the inta~e air housing 20 is compri-sed of a housing cover 20a anc the housing bottom 20b.
The fuel injection valve 17 is cisposed above the intake sec-tion 18 so as to be directed cbliquely upwardly, while bo~h devices penetrate the partition 19.
The electronic controller 22 is mounted in the intake housing 2û. The intake section 18 is ~rovided with an air filter 23.
The throttle valve connection piece 24 is additionally mounted in the intake sec.ion 18.
With the aid of the waste gas sensor 25 disposed within the area of the exhaust 16 or inside the outlet duct 15b of the cylinder 15, it is possible to determine the waste gas tem-perature for the controller 22.
CA 022~1764 1998-10-13 An optimal operational behavior is achieved when the ,uel pump not shown in the drawinc in or on the ,uel tank 2~, is disposed in the intake air stream 27 or in the coolinc air stream 28.
The power chain saw 10 depic.ed in the Figs 2 through L j5 comprised of a basic housing 11, on which a handle 13 and the chain blace 1Z are dis~osed. Inside the basic housi,-g 11, the fuel tank 26, a supply container tor lubricating oil, the cooling air guicance means and the in.ernal co,-bus.ion engine are loca.ed, which are not illus.rated i~
greater detail here as well as other normal means. Loc- ed on the basic housing 11 or, rather, projecting from the same, is the cylinder 15, cn which the magne,ic injec~i~n valve 31 as well as a-mear,s ,or the in.ake o,~ combus.icn air are ciisposed.
The fuel tank 26 is providec on the side 38 of the bas housing 11 loca.ed opposi.e the chain blade 12 wi.hin . e area of the handle 13. The pressure controller 35 is p~ ced in .he basic housing 11, .o be more precise, in tha par., in which also the fuel tank 26 is to be found.
In the embodiment depicted in Fig.2, in the intake air housing 20 mounted on the basic housing 11, the intake sec-tion 32 with the fuel return pipe 34, an electronic consrol-ler 30 and the magnetic injection valve 31 are disposec.
Ihe pressure controller 35 of the fuel injection sys.em is, according to the invention, disposed externally on the 'uel tank 26 in the intake air stream 36. The air stream 29 is produced by the magnet wheel/fan wheel 28 and conducted from the basic housing 11 to the cooling air housing 37.
In the embodiment illustrated in the Fig.3, in contrast to the embodiment shown in the Fig.2, provision has been made . . ... . . . . .. . ..
for the pressur~ controller 3, of the fuel injec.ion system to be disposed sn .he e~.er or of the fuel tank 2~ in tne intake air s.re-m 36 and this, accordins to .'e inven~-lon, so as to projec~ in.o the ir,.ake air housing 20.
In the emoodiment depic.ed in Fig.4 on the otner hand, pro-vision has been made for the pressure controller 35 for the fuel injection sys.em to be dis~osed on the fuel tank 26, which is intesrated into the basic housing 11.
CA 022~1764 1998-10-13 ~, _ LIST OF REFEREi~C-- 'Jb'i~aERS
Power chain saw 10 housing 11 chain blade 12 handle 13 tG p side 1 L
cylinder 15 cylinder inlet duct 1Sa cylinder outlet duc. 1Sr.
exhaust 16 fuel injection valve 17 intake sec'ion 18 bulkhead wall 19 intake air housing 20.
intake air housing, cover 2Qa intake air housing, bc.-am 20r cooling air housing 21 electronic controllar 22 air filter 23 throttle valve connection F ~arr 24 waste gas sensor 25 fuel tank 2S
intake air stream 27 cooling air stream 28 magnet wheel/fan wheel 29 electronic controller 30 magnetic injection valve 31 intake section 32 fuel return flow pipe 34 pressure controller 35 intake air stream 36 cooling air housing 37 side 38 , .. .. .. . . . . . .. ... .. . . . . . . . .
Claims (19)
1. Hand-operated tool, more particularly a power chain saw (100), cutting disk, brush cutter or suchlike, with an internal combustion engine, preferably a two-stroke engine with electronic direct fuel injection which is provided with a cooling blower or fan mounted on the crankshaft and, within the area of the cylinder (15), with a colliing air guidance means, which brings about an air flow along the axis of the crankshaft, characterized in that a bulkhead wall (19) proceeds on the cylinder (15), separating the adjacent intake air housing (20) with the intake section (18) from the cooling air guidance means and in that a fuel injection valve (17) is disposed above the cylinder intake duct (15a) so as to penetrate the bulkhead wall (19), in that the intake air housing (20) is provided with the fuel feed and/or fuel outlet for the electronically controlled fuel injection valve (17) and in that the fuel pump and the pressure controller (35) of the fuel injection system in the fuel tank 26, which is integrated into the basic housing (11) or which are disposed externally on the fuel tank (26) in the intake air system (27) or in the cooling air stream (28).
2. Hand-operated tool according to Claim 1, characterized in that the fuel injection valve (17) is installed so as to be inclined toward the cylinder head on the cylinder (15).
3. Hand-operated tool, according to either Claim 1 or 2, characterized in that the injection duct (25) of the fuel injection valve (17) is located opposite the side of the waste gas outlet aperture in the cylinder (15b) and above the inlet aperture (15a) in the cylinder.
4. Hand-operated tool according to any of Claims 1 through 3, characterized in that the intake section (18) serves for accomodating the fuel feed and/or fuel outlet for the electronically controlled fuel injection valve (17).
5. Hand-operated tool according to Claim 1 to 4, characterized in that the intake section (18) is provided with an air filter (23) and/or an air guidance path with a means for cooling the fuel.
6. Hand-operated tool according to any of Claims 1 to 5, characterized in that the electronically controlled fuel injection valve projects into the intake air housing (20) and, in the region of the bulkhead wall (19), is provided with a sealing element.
7. Hand-operated tool according to any of Claims 1 to 6, characterized in that the bulkhead wall (19), within the region of the penetration of the fuel injection valve, is configured with a convexity.
8. Hand-operated tool according to any of Claims 1 to 8, characterized in that the intake air housing (20) is comprised of a bottom (20a) and a cover (20b) with the electronic controller which, with the aid of a plug system, is connected with the cable harness of the control elements (sensors) with the bottom. (20a).
9. Hand-operated tool according to any of Claims 1 to 8, characterized in that the intake air housing (20) is provided with the head wall(19).
10. Hand-operated tool according to any of Claims 1 to 9, characterized in that the intake air housing (20) is, in its interior, provided with the control wirins for the electronically controlled fuel injection valve (17).
11. Hand-operated tool according to any of Claims 1 to 10, characterized in that the intake section (18) serves to accommodate the control wiring for the electronically controlled fuel injection valve (17).
12. Hand-operated tool according to any of Claims 1 to 11, characterized in that the throttle valve connection piece is contructed so as to accommodate an intake air temperature sensor.
13. Hand-operated tool according to any of Claims 1 to 12, characterized in that the cover (20b) is provided with the electonic control.
14. Hand-operated tool according to any of Claims 1 to 13, characterized in that the energy supply of the electronic control unit (22) is disposed in the cooling air housing (21).
15. Hand-operated tool according to any of Claims 1 to 14, characterized in that the fuel pump is disposed on the power drive side.
16. Hand-operated tool according to any of Claims 1 to 15, characterized in that the fuel pump is constructed so as to project into the intake air housing (20).
17. Hand-operated tool according to any of Claims 1 to 16, characterized in that a temperature sensor for the cylinder (15) and/or the cooling air housing is disposed.
18. Hand-operated tool according to any of Claims 1 to 17, characterized in that a sensor for determining the crank angle is disposed in the cooling air stream (28).
19. Hand-operated tool according to any of Claims 1 to 18, characterized in that a sensor (25) for determining the waste gas temperature is disposed in the waste gas stream.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1996114462 DE19614462A1 (en) | 1996-04-12 | 1996-04-12 | Hand=held tool with internal combustion engine with direct electronic injection |
| DE29606668 | 1996-04-12 | ||
| DE29606668.0 | 1996-04-12 | ||
| DE19614462.0 | 1996-04-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2251764A1 true CA2251764A1 (en) | 1997-10-23 |
Family
ID=26024677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002251764A Abandoned CA2251764A1 (en) | 1996-04-12 | 1997-04-14 | Hand-guided appliance with an internal combustion engine with direct electronic injection |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0891474B1 (en) |
| JP (1) | JP2001507632A (en) |
| CA (1) | CA2251764A1 (en) |
| DE (1) | DE59700729D1 (en) |
| WO (1) | WO1997039228A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8641816B2 (en) | 2009-11-03 | 2014-02-04 | Dow Global Technologies Llc | Vinyl ether compounds and methods of their preparation and use |
| US9016165B2 (en) | 2011-12-07 | 2015-04-28 | Andreas Stihl Ag & Co. Kg | Power tool with Bowden cable |
| US9175594B2 (en) | 2011-12-07 | 2015-11-03 | Andreas Stihl Ag & Co. Kg | Power tool |
| US9181864B2 (en) | 2012-04-18 | 2015-11-10 | Andreas Stihl Ag & Co. Kg | Work apparatus having a fuel pump |
| US9534528B2 (en) | 2011-12-07 | 2017-01-03 | Andreas Stihl Ag & Co. Kg | Internal combustion engine with fuel system |
| US10329994B2 (en) | 2011-12-07 | 2019-06-25 | Andreas Stihl Ag & Co. Kg | Power tool |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19808887A1 (en) * | 1998-03-03 | 1999-09-09 | Dolmar Gmbh | Hand tool with 2-stroke internal combustion engine and separate lubrication as well as a combined feed / metering pump for such a hand tool |
| US8375711B2 (en) | 2009-01-19 | 2013-02-19 | Vaculift, Inc. | Compact vacuum material handler |
| DE102015013784A1 (en) * | 2015-10-20 | 2017-04-20 | Andreas Stihl Ag & Co. Kg | Hand-held implement |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56110509A (en) * | 1980-02-05 | 1981-09-01 | Yanmar Diesel Engine Co Ltd | Air-cooled type internal combustion engine |
| DE3735711C2 (en) * | 1987-10-22 | 1995-03-16 | Stihl Maschf Andreas | Two-stroke engine with pneumatically operated injection pump for driving an implement |
| FR2657398B1 (en) * | 1990-01-22 | 1994-06-10 | Renault | VEHICLE REGULATION METHOD OF A DIRECT INJECTION ENGINE AND CONTROLLED IGNITION AND SYSTEM FOR IMPLEMENTING THE PROCESS AND USE FOR A TWO-STROKE ENGINE. |
| DE4142354C2 (en) * | 1991-12-20 | 2003-04-17 | Stihl Maschf Andreas | Hand-held implement with an internal combustion engine and an injection pump |
| JP3178922B2 (en) * | 1992-12-03 | 2001-06-25 | 小松ゼノア株式会社 | Engine intake system |
| DE9309436U1 (en) * | 1993-06-25 | 1994-11-03 | Dolmar Gmbh | Hand machine with an internal combustion engine arranged in a housing as the drive and an injection device therefor |
-
1997
- 1997-04-14 EP EP97919351A patent/EP0891474B1/en not_active Expired - Lifetime
- 1997-04-14 DE DE59700729T patent/DE59700729D1/en not_active Expired - Fee Related
- 1997-04-14 JP JP53673997A patent/JP2001507632A/en active Pending
- 1997-04-14 WO PCT/EP1997/001845 patent/WO1997039228A1/en active IP Right Grant
- 1997-04-14 CA CA002251764A patent/CA2251764A1/en not_active Abandoned
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8641816B2 (en) | 2009-11-03 | 2014-02-04 | Dow Global Technologies Llc | Vinyl ether compounds and methods of their preparation and use |
| US9016165B2 (en) | 2011-12-07 | 2015-04-28 | Andreas Stihl Ag & Co. Kg | Power tool with Bowden cable |
| US9175594B2 (en) | 2011-12-07 | 2015-11-03 | Andreas Stihl Ag & Co. Kg | Power tool |
| US9534528B2 (en) | 2011-12-07 | 2017-01-03 | Andreas Stihl Ag & Co. Kg | Internal combustion engine with fuel system |
| US10329994B2 (en) | 2011-12-07 | 2019-06-25 | Andreas Stihl Ag & Co. Kg | Power tool |
| US9181864B2 (en) | 2012-04-18 | 2015-11-10 | Andreas Stihl Ag & Co. Kg | Work apparatus having a fuel pump |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0891474A1 (en) | 1999-01-20 |
| DE59700729D1 (en) | 1999-12-23 |
| WO1997039228A1 (en) | 1997-10-23 |
| EP0891474B1 (en) | 1999-11-17 |
| JP2001507632A (en) | 2001-06-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |