EP2653695A2 - Outil doté d'une pompe à carburant - Google Patents

Outil doté d'une pompe à carburant Download PDF

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Publication number
EP2653695A2
EP2653695A2 EP13001921.9A EP13001921A EP2653695A2 EP 2653695 A2 EP2653695 A2 EP 2653695A2 EP 13001921 A EP13001921 A EP 13001921A EP 2653695 A2 EP2653695 A2 EP 2653695A2
Authority
EP
European Patent Office
Prior art keywords
fuel
pump
fuel tank
tank
tool according
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
EP13001921.9A
Other languages
German (de)
English (en)
Other versions
EP2653695A3 (fr
EP2653695B1 (fr
Inventor
Jonas Lank
Helmut Zimmermann
Klaus-Martin Uhl
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.)
Andreas Stihl AG and Co KG
Original Assignee
Andreas Stihl AG and Co KG
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 Andreas Stihl AG and Co KG filed Critical Andreas Stihl AG and Co KG
Publication of EP2653695A2 publication Critical patent/EP2653695A2/fr
Publication of EP2653695A3 publication Critical patent/EP2653695A3/fr
Application granted granted Critical
Publication of EP2653695B1 publication Critical patent/EP2653695B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • 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
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/16—Other means for enriching fuel-air mixture during starting; Priming cups; using different fuels for starting and normal operation
    • 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
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/007—Layout or arrangement of systems for feeding fuel characterised by its use in vehicles, in stationary plants or in small engines, e.g. 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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/046—Arrangements for driving diaphragm-type pumps
    • 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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/16—Feeding by means of driven pumps characterised by provision of personally-, e.g. manually-, operated pumps
    • 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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/18—Feeding by means of driven pumps characterised by provision of main and auxiliary pumps

Definitions

  • the invention relates to a working device with a fuel pump of the type specified in the preamble of claim 1.
  • the invention has for its object to provide a working device with an advantageous arrangement of a structural unit of fuel pump and feed pump.
  • cooling air is usually conveyed by the internal combustion engine, which cools the engine.
  • the fuel pump during the operation of the internal combustion engine and in particular after the switching off of the internal combustion engine, when no longer promotes cooling air If the combustion engine is still hot, overheated, vapor bubbles may form. If vapor bubbles are present in the fuel pump, the fuel pump, in particular when it is designed as a diaphragm pump, no longer promote fuel. An excessive heating of the fuel pump should therefore be avoided. This can be achieved in a simple manner in that the structural unit is arranged at least partially on a tank wall bounding the tank interior of the fuel tank.
  • the fuel tank is usually located in a working equipment in a cool area to prevent excessive heating of the fuel during operation. In operation, the largest heat due to combustion in the cylinder of the internal combustion engine.
  • the fuel tank is usually arranged at the greatest possible distance from the cylinder of the internal combustion engine in order to keep the heat input into the fuel tank low.
  • the fuel itself causes a uniform temperature distribution in the fuel tank and thereby a good output of heat introduced into the fuel tank over cool areas of the fuel tank to the outside.
  • the arrangement on the tank wall ie immediately adjacent to the tank wall, excessive heating of the fuel pump can be prevented.
  • Heat introduced into the fuel pump may be released to the fuel via the tank wall of the fuel tank and out to the outside via cool areas of the fuel tank. The heat is also released by the fuel pump to the ambient air.
  • the fuel pump is cooled both by the fuel in the fuel tank and by the ambient air.
  • the assembly is at least partially disposed in a recess of the fuel tank.
  • the arrangement of the assembly at least partially in a recess of the fuel tank ensures that there is only a small difference in height at the usual parking position of the implement between the pump and the fuel level.
  • the hydrostatic pressure difference to be overcome between the fuel tank and the feed pump which results from the different altitude, is comparatively low in the arrangement of the unit in a recess of the fuel tank.
  • the hydrostatic pressure level between the feed pump and the fuel tank differs only slightly. This can be used to drive the power required for the fuel pump as well as the force to be applied by the operator for actuating the feed pump are kept low.
  • At least approximately 50% of the height of the structural unit measured in the effective direction of gravity is advantageously arranged below the uppermost area of the upper side and above the lowermost area of the underside of the fuel tank. At least about 50% of the unit relative to the height of the unit thus extend in the area of the fuel tank.
  • at least about 70%, in particular at least about 80%, of the height of the structural unit is arranged below the uppermost region of the upper side and above the lowermost region of the lower side of the fuel tank, ie at a height level between the upper side and the lower side of the fuel tank. The unit thus projects in the parking position over at most half, in particular significantly less than half their height in the height direction beyond the fuel tank addition.
  • the top, the bottom and the back are thereby bounded by the tank wall.
  • the top, bottom and rear of the fuel tank define the tank interior.
  • the recess advantageously extends at the top and the rear of the fuel tank.
  • the rear side of the fuel tank that is, the side of the fuel tank facing away from the tool, is usually a particularly cool region of the fuel tank.
  • the arrangement on the upper side of the fuel tank ensures that the way to the combustion engine or to a fuel injector supplying the internal combustion engine can be kept low, whereby the pressure losses between the fuel pump and the injection valve can be kept low.
  • the internal combustion engine generates vibrations which, even with a low filling level of the fuel in the fuel tank, cause a substantial wetting of the tank wall with fuel.
  • good cooling of the entire tank wall, in particular also the upper side of the fuel tank is achieved by the fuel even at a low filling level.
  • the depression is arranged on the side facing away from the engine side of the fuel tank.
  • the fuel tank is particularly cool, as heat is generated during operation, especially in the cylinder of the internal combustion engine. Due to the arrangement of the assembly on the side facing away from the engine side of the fuel tank, the assembly is arranged at a relatively cool location in a relatively large distance from the engine.
  • a simple structure results when the assembly is held positively on the fuel tank. As a result, a secure fixation of the unit can be achieved in a simple manner.
  • the positive fixation advantageously takes place via a holder.
  • the holder determines the position of the assembly in at least two mutually perpendicular directions in space. This allows the unit to be easily mounted on the fuel tank and is accessible from the two spatial directions, so that there is also sufficient space for operating the pump for the operator and for connecting connecting lines to the unit is available.
  • the fuel tank is advantageously vibration-decoupled from the internal combustion engine via at least one anti-vibration element.
  • a simple structure results when the anti-vibration element is fixed to the holder.
  • the fuel tank is advantageously integrated on a handle housing of the implement. At least one handle of the implement is held on the handle housing.
  • the handle is advantageously integrated in the handle housing.
  • the handle housing is a complex one Component, and in particular forms a supporting housing part of the working device on which other components such as a motor housing are held.
  • the fuel tank forms part of the handle housing.
  • the feed pump has a pump bellows to be operated by the operator.
  • the pump bellows is advantageously arranged close to at least one further operating element of the working device, in particular to a throttle lever of the working device.
  • the pump bellows is advantageously arranged adjacent to a handle of the working device, in particular adjacent to a rear handle of the working device. Adjacent to the pump bellows, a stop switch of the implement is advantageously arranged.
  • the close-to-space arrangement of throttle, pump bellows and stop switch results in a simple, self-explanatory use for the operator.
  • the controls are in close proximity to each other and thus easily located for the operator and easy to use. Immediate physical proximity is given in particular when the operator can hold with one hand the rear handle of the implement and at the same time, for example with the thumb of the same hand, operate the pump bellows or the stop switch.
  • the assembly has a pump housing which limits the fuel pump and the delivery pump.
  • the pump housing is arranged completely in the recess in the longitudinal direction of the working device. In the longitudinal direction of the implement is advantageous only the pump bellows on the back of the fuel tank addition. This results in an attractive outer shape of the implement.
  • the integration of the pump housing in the fuel tank can be easily avoided that in addition to the operator to be operated pump bellows other parts of the assembly beyond the housing of the implement, where the operator could get stuck or that could disturb the operator in the operation ,
  • the fuel pump is advantageously a diaphragm pump, which is driven by the fluctuating pressure in a crankcase of the internal combustion engine.
  • the assembly advantageously comprises a pressure regulator arranged in the pump housing, which is arranged downstream of the fuel pump in the conveying direction of the fuel.
  • the pressure regulator advantageously has a control diaphragm which separates a control chamber from a rear space.
  • the tank wall adjacent to the assembly has a connection opening.
  • an intake pipe is integrated, which connects the tank interior with the fuel pump. Through the connection opening and the suction line, the fuel pump can be easily connected to the tank interior. This results in a simple structure. A trained as a separate hose suction can be omitted.
  • the assembly is simplified, since no connection of the suction line must be made.
  • the integrated intake pipe is connected to the fuel tank with the connection opening during assembly of the unit. The seal can be done in a simple manner between the pump housing of the unit and the tank wall.
  • Fig. 1 shows as an exemplary embodiment of a working device, a hand-held working device, namely a power saw 1.
  • a hand-held working device namely a power saw 1.
  • another hand-held implement such as a cut-off, a brushcutter or the like.
  • the power saw 1 has a handle housing 2 and a motor housing 92.
  • a rear handle 5 is formed, on which a throttle 6 and a throttle lock 7 are pivotally mounted.
  • a fuel tank 12 is also formed, which is closed by a fuel cap 13.
  • Fig. 2 shows schematically, the handle housing 2 from the motor housing 92 via three anti-vibration elements 19 is vibration-decoupled. In addition, further anti-vibration elements may be provided.
  • an internal combustion engine 18 is arranged in the motor housing 92.
  • the internal combustion engine 18 is of the in Fig. 1 Cover shown hood 3 covered.
  • the hood 3 may be formed in one or more parts and other components of the power saw 1, in particular the intake system of the engine 18, cover.
  • the chainsaw 1 has a handle tube 11 which engages over the hood 3.
  • the chainsaw 1 has a guide rail 16, on which a driven by the engine 18 circumferentially driven saw chain 17 is arranged.
  • a hand guard 10 is mounted on the motor housing 92, which can serve to actuate a braking device for the saw chain 17.
  • the chainsaw 1 has an oil tank 14 which is closed by a fuel cap 15.
  • the oil tank 14 serves to provide lubricating oil for the saw chain 17.
  • the chainsaw 1 has a pumping bellows 8, which is part of a further described in more detail below manually operated feed pump.
  • the pump bellows 8 is arranged in the immediate vicinity of the rear handle 5 and the throttle 6.
  • a stop switch 9 is arranged.
  • the stop switch 9 has a hemispherical, elastic cap, which is easy to operate by the operator with thick gloves.
  • the shape of the cap of the stop switch 9 corresponds approximately to the shape of the pump bellows 8.
  • the pump bellows 8 and the stop switch 9 are arranged so that the operator can grip the pump bellows 8 or the stop switch 9 with his thumb when his right hand on the rear handle. 5 is arranged.
  • the arrangement of pump bellows 8, stop switch 9 and rear handle 5 with the throttle 6 and the throttle lock 7 in close proximity to each other allows easy and ergonomic operation.
  • Fig. 1 three spatial directions x, y and z are shown, which are aligned perpendicular to each other.
  • the first spatial direction x extends in the transverse direction of the motor saw 1, ie in a direction perpendicular to the plane of the guide rail 16.
  • the second spatial direction y extends parallel to the in Fig. 2 shown longitudinal direction 91 of the power saw 1 from the rear handle 5 in the direction of the guide rail 16.
  • the second spatial direction y is parallel to the plane of the guide rail 16.
  • the third spatial direction z is perpendicular to the spatial directions x and y and corresponds to the height direction.
  • the third spatial direction z runs opposite to the effective direction 89 of gravity.
  • the fuel tank 12 extends approximately over the entire measured in the first spatial direction x width of the power saw 1.
  • the fuel tank 12 has a recess 20 in which a pump housing 21 is arranged.
  • the pump housing 8 protrudes from the pump housing 21.
  • the pump housing 21 is held in the spatial directions y and z by a holder 22 on the fuel tank 12.
  • the holder 22 is fixed with a fastening screw 23 on the handle housing 2.
  • Fig. 4 shows the design of the handle housing 2 in detail.
  • the fuel tank 12 is integrated adjacent to the rear handle 5 on the handle housing 2. At the side facing away from the rear handle 5 side protrudes from the fuel tank 12 from a boom 93 to which at least one of the anti-vibration elements 19 for connection to the motor housing 92 (FIG. Fig. 2 ).
  • the fuel tank 12 has a top 63 which is in the in Fig. 2 shown conventional parking position 67 relative to the effective direction 89 of gravity is at the top.
  • the fuel tank 12 also has a rear handle 65 facing the rear side 65 and a longitudinal side 64 which is approximately parallel to the plane of the guide rail 16 (FIGS. Fig. 2 ) is aligned and at the tank cap 13 is provided.
  • the anti-vibration member 19 extends upwardly from the plane of the upper surface 63 of the fuel tank 12.
  • a second holder 29 is fixed to the anti-vibration element 19, which is designed as a helical spring.
  • the second holder 29 is screwed as well as the first holder 22 in the coil spring of the anti-vibration member 19.
  • the second holder 29 is fixed with a fastening screw 31 on a fastening element 30, the part of the motor housing 92 (FIG. Figures 1 and 2 ).
  • a first connecting piece 27 is arranged, to which a suction line 24 is connected.
  • a second connecting piece 28 is also provided, which can serve to connect a return line from a fuel valve.
  • the suction line 24 opens into the pump housing 21.
  • a fuel line 25 for supplying fuel to a fuel valve and a pulse line 26 for connection to a crankcase of the engine 18 are also connected.
  • Fig. 5 shows the structure of the fuel system in detail.
  • a suction head 32 is arranged, which is connected to the suction line 24.
  • a fuel pump 33 is arranged, which sucks the fuel via the suction head 32 and the suction line 24.
  • the fuel pump 33 is driven by the fluctuating pressure in a crankcase 61 of the engine 18.
  • the fuel pump 33 may be driven by the engine 18 in other ways.
  • the fuel pump 33 is connected via the impulse line 26 to the interior of the crankcase 61.
  • the fuel sucked in via the intake line 24 flows via a suction valve 34 of the fuel pump 33 into a pump chamber 35.
  • the pump chamber 35 is delimited by a pump diaphragm 86, which is deflected as a function of the fluctuating crankcase pressure and thereby the fuel via the intake valve 34 into the pump chamber 35 sucks and via a pressure valve 36 in a storage space 38, which is arranged downstream of the fuel pump 33, expresses.
  • the storage space 38 is connected via an inlet valve 37 to a control chamber 41 of a pressure regulator 40.
  • the control chamber 41 is bounded by a control diaphragm 42 which separates the control chamber 41 from a rear space 43.
  • the control diaphragm 42 is biased by a spring 44.
  • the inlet valve 37 has a valve needle 39, which is mounted on a lever 45. The lever 45 couples the position of the control diaphragm 42 to the position of the inlet valve 37. If the pressure in the control chamber 41 decreases, the control diaphragm 42 is deflected toward the control chamber 41.
  • This movement opens the inlet valve 37, so that fuel from the storage chamber 38 flows into the control chamber 41 until the pressure in the control chamber 41 is so high that the control diaphragm 42 closes the inlet valve 37 via the lever 45 again.
  • the rear space 43 is acted upon via an opening 46 with a reference pressure, advantageously with the ambient pressure.
  • the control chamber 41 is connected via the fuel line 25 with a pressure damper 53 and a fuel valve 60.
  • a fuel strainer 47 is arranged at the exit from the control chamber 41.
  • a delivery pump 48 is also arranged, which comprises the pump bellows 8, an inlet valve 49 and an outlet valve 50. Downstream of the branch to the inlet valve 49 and upstream of the outlet of the outlet valve 50 into the fuel line 25, a check valve 51 is arranged, which closes in the flow direction from the pressure damper 53 to the pressure regulator 40.
  • the feed pump 48 serves to flood the fuel system before starting the engine 18. This ensures that when starting the internal combustion engine 18 fuel is present at the fuel valve 60.
  • the fuel pump 33 can only deliver fuel when the engine 18 is running, since it is driven by the fluctuating pressure in the crankcase 61.
  • the fuel pump 33, the pressure regulator 40 and the feed pump 48 are arranged in the common pump housing 21 and form a structural unit 76 which is located in the depression 20 (FIG. Fig. 3 ) of the fuel tank 12 is arranged.
  • a good cooling of the assembly 76 and on the other hand an arrangement in the vicinity of the fuel level in the fuel tank 12 is achieved so that only a small geodetic difference in height between the assembly 76 and the fuel level in the fuel tank 12 is.
  • the pressure difference to be overcome due to a difference in height between the fuel tank 12 and assembly 76 is kept low.
  • the pressure damper 53 is arranged with the fuel valve 60 together in a common valve holder 52.
  • the pressure damper 53 is advantageously arranged immediately adjacent to the fuel valve 60 in the fuel line 25.
  • the fuel valve 60 advantageously supplies the fuel to the crankcase 61.
  • the valve holder 52 may be fixed to the crankcase 61.
  • the pressure damper 53 has a damping chamber 54 into which fuel flows from the fuel line 25.
  • the damping chamber 54 is delimited by a damping diaphragm 55, which separates the damping chamber 54 from a rear space 57.
  • the damping membrane 55 is biased by a spring 56.
  • the biasing force of the spring 56 determines the position of the damping diaphragm 55 at the operating pressure.
  • the rear space 57 is acted upon via an opening 58 with a reference pressure, preferably the ambient pressure.
  • a relief line 59 leads back to the fuel tank 12.
  • a check valve 62 is arranged in the discharge line 59.
  • the check valve 62 opens at a pressure that is slightly greater than the operating pressure.
  • FIGS. 6 and 7 show the arrangement of the assembly 76 on the fuel tank 12 in detail.
  • Fig. 6 shows the recess 20 to the back 65 and the top 63 ( Fig. 4 ) open.
  • the recess 20 is bounded by a fastening web 68.
  • an intermediate part 69 can be arranged, which can serve to compensate for tolerances.
  • the intermediate part 69 may also be provided as a pressure piece, with which the fastening screw 23 of the holder 22 presses against the pump housing 21 and this additionally fixed non-positively.
  • a receptacle 72 is provided for a portion of the pump housing 21 at the approximately parallel to the rear 65 extending wall of the recess 20.
  • the pump housing 21 is supported with a seal 70 and a disc 71 on the edge of the receptacle 72 from.
  • the pump housing 21 has a pin 77 which projects laterally in the direction of the holder 22 in the first spatial direction x.
  • the holder 22 engages over the pin 77 and thereby secures the position of the pump housing 21 in the second spatial direction y.
  • the pump housing 21 is thereby fixed to the rear side 65 in the recess 20.
  • the holder 22 also has a retaining contour 73, which is executed rounded in accordance with an upper edge of the pump housing 21 and the pump housing 21 in the third spatial direction z overlaps.
  • the pump housing 21 is fixed in the third spatial direction z in the recess 20.
  • a positive fixation of the pump housing 21 in the spatial directions y and z is achieved.
  • the position of the pump housing 21 is secured by the fastening web 68.
  • Fig. 7 only a partial shell of the handle housing 2 is shown. As a result, a fuel hose 74 arranged in the fuel tank 12 is visible in this view. The arrangement of the fuel hose 74 in the fuel tank 12 is also in Fig. 8 shown.
  • Fig. 8 shows the arrangement of the assembly 76 and the design of the recess 20 in detail.
  • the fuel tank 12 has a tank wall 94, which limits a tank interior 95. In the tank interior 95, the fuel is arranged during operation.
  • the assembly 76 is disposed on the tank wall 94.
  • the pump housing 21 abuts against the tank wall 94. As a result, heat introduced into the assembly 76 can be released well to the fuel tank 12.
  • the depression 20 has a depth a measured in the effective direction 89 of gravity a. The depth a is measured from the top of the top 63 from.
  • the structural unit 76 has a height b measured in the effective direction 89 of gravity, that is to say in the spatial direction z, which is somewhat greater than the depth a.
  • the assembly 76 projects slightly beyond the area of the tank wall 94 that forms the top 63 of the fuel tank 12.
  • the depth a is advantageously at least about 50% of the height b.
  • the depth a is in particular at least about 70%, particularly advantageously at least about 80% of the height b.
  • the assembly 76 is in the parking position 67 (FIG. Fig. 2 ) arranged comparatively close to the level of the fuel in the fuel tank 12, so that only a small difference in height and thus only a small hydrostatic pressure difference must be overcome.
  • the arrangement in the region of the upper side 63 results in an advantageous arrangement of suction line 24, fuel line 25 and Pulse line 26. These lines can be routed to the top 63 of the fuel tank 12. There are short lines.
  • the pump housing 21 has a measured in the spatial direction y, ie in the longitudinal direction 91 of the power saw 1 width d, which is smaller than the measured in the direction of space y length c of the recess 20.
  • the pump housing 21 on the rear side 65 of the fuel tank 12 does not protrude beyond the fuel tank 12. Only the pumping bellows 8 projects over the plane defined by the rear side 65 of the fuel tank 12.
  • Fig. 8 also the bottom 66 of the fuel tank 12 is shown.
  • the underside 66 is in the usual parking position 67, the bottom side of the fuel tank 12. It may also be provided, the assembly 76 adjacent to the bottom 66 of the fuel tank 12 or in a central position between the top 63 and bottom 66 to order.
  • at least about 50% of the height b of the assembly 76 relative to the effective direction 89 of gravity in Abstellposition 67 above the lowermost portion of the bottom 66 and below the uppermost portion of the top 63 of the fuel tank 12 is arranged.
  • the upper side 63 and the lower side 66 are formed by the tank wall 94, that is to say by a wall which delimits the tank interior 95.
  • Fig. 9 shows the structure of the assembly 76 in detail.
  • the pump housing 21 has a housing bottom 80 which projects into the receptacle 72. Between the housing bottom 80 and the wall of the fuel tank 12, the seal 70 and the disc 71 are arranged.
  • the bottom 80 limits the pressure regulator 40.
  • a bottom part 84 is fixed, in which an adjusting screw 82 is screwed.
  • a fastening bolt 83 is fixed, which is rotatably held in a support plate 81.
  • the spring 44 is supported, which biases the control diaphragm 42.
  • the housing bottom 80 limits the rear space 43 of the pressure regulator 40.
  • the pump housing 21 has a housing base body 78 which is separated from the housing bottom 80 by the control diaphragm 42 and a seal 88.
  • the seal 88 may also be integrated with the control membrane 42.
  • the control chamber 41 is formed on the housing bottom 80 side facing.
  • the lever 45 is mounted in the control chamber 41.
  • the lever 45 is acted upon by a spring 87.
  • On the housing bottom 80 opposite side of the housing base body a housing upper part 79 is arranged.
  • the impulse line 26 opens on the housing base body 78.
  • the pump diaphragm 86 of the fuel pump 33 is arranged between the housing base body 78 and the upper housing part 79.
  • the pump bellows 8 In the upper housing part 79 of the pump chamber 35 is formed. At the upper housing part 79, the pump bellows 8 is held on the side facing away from the housing base body 78. The pump bellows 8 is fixed by a housing cover 85, which is screwed to the housing upper part 79. In the pump bellows 8, a spring 75 is arranged, which springs the pump bellows 8 in its unactuated position and ensures that the pump bellows 8 returns to its initial position after actuation.
  • Fig. 10 shows an embodiment of a fuel tank 12 arranged on the assembly 90.
  • the same reference numerals designate like elements as in the preceding figures.
  • the assembly 90 has a pump housing 21, in which a pressure regulator 40, a fuel pump 33 and a manually operated feed pump 48 are arranged.
  • the pump housing 21 has a housing base body 78, an upper housing part 79 and a housing cover 85.
  • the housing bottom which delimits the rear space 43 of the pressure regulator 40, is formed by the fuel tank 12.
  • the spring 44 which biases the control diaphragm 42, is supported on the fuel tank 12. As a result, a separate housing bottom 80 can be omitted.
  • Fig. 11 shows an embodiment of a structural unit 96, the construction of which essentially corresponds to that of the structural unit 76. Like reference numerals denote corresponding elements.
  • the assembly 96 is disposed in the recess 20 on the tank wall 94.
  • in the Area of the receptacle 72 has the tank wall 94 within the seal 70 has a connection opening 97 in which the fuel hose 74 may be held.
  • a suction line 98 is integrated, which in Fig. 11 is shown schematically and connects the arranged in the receptacle 72 portion of the pump housing 21 with the fuel pump 33.
  • the fuel pump 33 can suck fuel from the tank interior 95.
  • a separate, serving as a suction hose can be omitted. This results in a simple structure.
  • the receptacle 72 can be easily sealed from the environment via the seal 70 and the disc 71.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Reciprocating Pumps (AREA)
EP13001921.9A 2012-04-18 2013-04-12 Outil doté d'une pompe à carburant Active EP2653695B1 (fr)

Applications Claiming Priority (1)

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DE102012007617.7A DE102012007617B4 (de) 2012-04-18 2012-04-18 Arbeitsgerät mit einer Kraftstoffpumpe

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EP2873848A1 (fr) * 2013-11-19 2015-05-20 Andreas Stihl AG & Co. KG Appareil de travail manuel doté d'une pompe, pompe et soufflet de pompe
EP3181856A3 (fr) * 2015-12-15 2017-07-05 Andreas Stihl AG & Co. KG Appareil de travail manuel comprenant un dispositif de commande

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CN103993997B (zh) * 2014-04-16 2016-06-15 中国航空工业集团公司沈阳飞机设计研究所 一种新型发动机燃油驱动设备
US10451019B2 (en) * 2015-07-09 2019-10-22 Caterpillar Inc. Starter device for a prime mover
DE102015016484A1 (de) * 2015-12-15 2017-06-22 Andreas Stihl Ag & Co. Kg Manuell zu betätigende Förderpumpe und Kraftstoffsystem mit einer Förderpumpe
DE102018004881A1 (de) * 2018-06-19 2019-12-19 Andreas Stihl Ag & Co. Kg Vergaser und handgeführtes Arbeitsgerät mit einem Verbrennungsmotor mit einem Vergaser
DE112021005043T5 (de) * 2020-10-26 2023-09-14 Husqvarna Ab Kraftstoffzufuhranordnung, Zweitaktmotor und angetriebenes Werkzeug

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EP2873848A1 (fr) * 2013-11-19 2015-05-20 Andreas Stihl AG & Co. KG Appareil de travail manuel doté d'une pompe, pompe et soufflet de pompe
EP3181856A3 (fr) * 2015-12-15 2017-07-05 Andreas Stihl AG & Co. KG Appareil de travail manuel comprenant un dispositif de commande
US10322519B2 (en) 2015-12-15 2019-06-18 Andreas Stihl Ag & Co. Kg Hand-guided power tool with a control device

Also Published As

Publication number Publication date
CN103375320B (zh) 2017-06-13
DE102012007617A1 (de) 2013-10-24
EP2653695A3 (fr) 2013-10-30
EP2653695B1 (fr) 2015-06-10
US20130276724A1 (en) 2013-10-24
CN103375320A (zh) 2013-10-30
US9181864B2 (en) 2015-11-10
DE102012007617B4 (de) 2014-11-13

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