EP2653695A2 - Tool comprising a fuel pump - Google Patents
Tool comprising a fuel pump Download PDFInfo
- 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
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 105
- 239000002828 fuel tank Substances 0.000 claims abstract description 102
- 238000002485 combustion reaction Methods 0.000 claims abstract description 29
- 230000005484 gravity Effects 0.000 claims description 7
- 238000013016 damping Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 230000002706 hydrostatic effect Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000003570 air Substances 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 210000003813 thumb Anatomy 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
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)
Abstract
Description
Die Erfindung betrifft ein Arbeitsgerät mit einer Kraftstoffpumpe der im Oberbegriff des Anspruchs 1 angegebenen Gattung.The invention relates to a working device with a fuel pump of the type specified in the preamble of
Aus der
Beispielsweise aus der
Der Erfindung liegt die Aufgabe zugrunde, ein Arbeitsgerät mit einer vorteilhaften Anordnung einer Baueinheit aus Kraftstoffpumpe und Förderpumpe anzugeben.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.
Diese Aufgabe wird durch ein Arbeitsgerät mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a working device with the features of
Beim Betrieb des Arbeitsgeräts heizt sich der Verbrennungsmotor stark auf. Im Betrieb wird üblicherweise Kühlluft vom Verbrennungsmotor gefördert, die den Motor kühlt. Wenn die Kraftstoffpumpe während des Betriebs des Verbrennungsmotors und insbesondere auch nach dem Abschalten des Verbrennungsmotors, wenn keine Kühlluft mehr gefördert wird und der Verbrennungsmotor noch heiß ist, übermäßig erhitzt wird, können sich Dampfblasen bilden. Wenn Dampfblasen in der Kraftstoffpumpe vorhanden sind, kann die Kraftstoffpumpe insbesondere dann, wenn sie als Membranpumpe ausgebildet ist, keinen Kraftstoff mehr fördern. Eine übermäßige Erhitzung der Kraftstoffpumpe soll deshalb vermieden werden. Dies kann auf einfache Weise dadurch erreicht werden, dass die Baueinheit mindestens teilweise an einer den Tankinnenraum des Kraftstofftanks begrenzenden Tankwand angeordnet ist. Der Kraftstofftank ist in einem Arbeitsgerät üblicherweise in einem kühlen Bereich angeordnet, um eine übermäßige Erwärmung des Kraftstoffs im Betrieb zu verhindern. Im Betrieb entsteht die größte Wärme aufgrund der Verbrennung im Zylinder des Verbrennungsmotors. Der Kraftstofftank ist üblicherweise in größtmöglichem Abstand vom Zylinder des Verbrennungsmotors angeordnet, um den Wärmeeintrag in den Kraftstofftank gering zu halten. Der Kraftstoff selbst bewirkt eine gleichmäßige Temperaturverteilung im Kraftstofftank und dadurch eine gute Abgabe von in den Kraftstofftank eingetragener Wärme über kühle Bereiche des Kraftstofftanks nach außen. Durch die Anordnung an der Tankwand, also unmittelbar benachbart zu der Tankwand, kann eine übermäßige Erwärmung der Kraftstoffpumpe verhindert werden. In die Kraftstoffpumpe eingetragene Wärme kann über die Tankwand des Kraftstofftanks in den Kraftstoff und von dort über kühle Bereiche des Kraftstofftanks nach außen abgegeben werden. Die Wärme wird von der Kraftstoffpumpe außerdem an die Umgebungsluft abgegeben. Damit wird die Kraftstoffpumpe sowohl über den Kraftstoff im Kraftstofftank als auch über die Umgebungsluft gekühlt.When operating the implement heats up the engine greatly. During operation, cooling air is usually conveyed by the internal combustion engine, which cools the engine. When 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. Thus, the fuel pump is cooled both by the fuel in the fuel tank and by the ambient air.
Vorteilhaft ist die Baueinheit mindestens teilweise in einer Vertiefung des Kraftstofftanks angeordnet. Durch die Anordnung der Baueinheit mindestens teilweise in einer Vertiefung des Kraftstofftanks wird sichergestellt, dass zwischen der Förderpumpe und dem Kraftstoffpegel nur ein geringer Höhenunterschied bei üblicher Abstellposition des Arbeitsgeräts besteht. Dadurch ist der zwischen dem Kraftstofftank und der Förderpumpe zu überwindende hydrostatische Druckunterschied, der sich aufgrund der unterschiedlichen Höhenlage ergibt, bei der Anordnung der Baueinheit in einer Vertiefung des Kraftstofftanks vergleichsweise gering. Auch das hydrostatische Druckniveau zwischen der Förderpumpe und dem Kraftstofftank unterscheidet sich nur wenig. Dadurch kann die zum Antrieb der Kraftstoffpumpe benötigte Leistung sowie die vom Bediener aufzubringende Kraft zur Betätigung der Förderpumpe gering gehalten werden.Advantageously, 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. As a result, 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. Also, 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.
Vorteilhaft ist in Abstellposition des Arbeitsgeräts mindestens etwa 50% der in Wirkrichtung der Schwerkraft gemessenen Höhe der Baueinheit unterhalb des obersten Bereichs der Oberseite und oberhalb des untersten Bereichs der Unterseite der Kraftstofftank angeordnet. Mindestens etwa 50% der Baueinheit bezogen auf die Höhe der Baueinheit erstrecken sich demnach im Bereich des Kraftstofftanks. Vorteilhaft sind mindestens etwa 70%, insbesondere mindestens etwa 80% der Höhe der Baueinheit unterhalb des obersten Bereichs der Oberseite und oberhalb des untersten Bereichs der Unterseite des Kraftstofftanks, also auf einem Höhenniveau zwischen der Oberseite und der Unterseite des Kraftstofftanks, angeordnet. Die Baueinheit ragt demnach in Abstellposition über höchstens die Hälfte, insbesondere deutlich weniger als die Hälfe ihrer Höhe in Höhenrichtung über den Kraftstofftank hinaus. Die Oberseite, die Unterseite und die Rückseite werden dabei durch die Tankwand begrenzt. Die Oberseite, die Unterseite und die Rückseite des Kraftstofftanks begrenzen den Tankinnenraum. Weitere Bereiche des Griffgehäuses, die den Tankinnenraum nicht begrenzen und damit nicht Teil des Kraftstofftanks sind, stellen keinen Teil der Oberseite, der Unterseite oder der Rückseite des Kraftstofftanks dar.In the parking position of the working device, 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. Advantageously, 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. Other areas of the handle housing, which do not limit the tank interior and thus are not part of the fuel tank, do not form part of the top, bottom or rear of the fuel tank.
Die Vertiefung erstreckt sich vorteilhaft an der Oberseite und der Rückseite des Kraftstofftanks. Die Rückseite des Kraftstofftanks, also die dem Werkzeug abgewandte Seite des Kraftstofftanks, ist üblicherweise ein besonders kühler Bereich des Kraftstofftanks. Durch die Anordnung an der Oberseite des Kraftstofftanks wird erreicht, dass der Weg zum Verbrennungsmotor bzw. zu einem dem Verbrennungsmotor Kraftstoff zuführenden Einspritzventil gering gehalten werden kann, wodurch die Druckverluste zwischen Kraftstoffpumpe und Einspritzventil gering gehalten werden können. Im Betrieb erzeugt der Verbrennungsmotor Vibrationen, die auch bei geringer Füllhöhe des Kraftstoffs im Kraftstofftank eine weitgehende Benetzung der Tankwand mit Kraftstoff bewirken. Dadurch wird auch bei geringer Füllhöhe eine gute Kühlung der gesamten Tankwand, insbesondere auch der Oberseite des Kraftstofftanks, durch den Kraftstoff erreicht. Dadurch ist die Oberseite des Kraftstofftanks auch bei geringer Füllhöhe ein vergleichsweise kühler Bereich des Arbeitsgeräts. Vorteilhaft ist die Vertiefung an der dem Verbrennungsmotor abgewandten Seite des Kraftstofftanks angeordnet. An dieser Seite ist der Kraftstofftank besonders kühl, da Wärme im Betrieb vor allem im Zylinder des Verbrennungsmotors entsteht. Durch die Anordnung der Baueinheit an der dem Verbrennungsmotor abgewandten Seite des Kraftstofftanks ist die Baueinheit an einem vergleichsweise kühlen Ort in vergleichsweise großem Abstand zum Verbrennungsmotor angeordnet.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. During operation, 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. As a result, 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. This is the top the fuel tank even at low level a relatively cool area of the implement. Advantageously, the depression is arranged on the side facing away from the engine side of the fuel tank. On this side, 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.
Ein einfacher Aufbau ergibt sich, wenn die Baueinheit formschlüssig an dem Kraftstofftank gehalten ist. Dadurch kann auf einfache Weise eine sichere Fixierung der Baueinheit erreicht werden. Die formschlüssige Fixierung erfolgt vorteilhaft über einen Halter. Vorteilhaft legt der Halter die Lage der Baueinheit in mindestens zwei senkrecht zueinander stehenden Raumrichtungen fest. Dadurch kann die Baueinheit einfach an dem Kraftstofftank montiert werden und ist von den beiden Raumrichtungen aus zugänglich, so dass auch ausreichend Bauraum zur Bedienung der Förderpumpe für den Bediener und zum Anschluss von Verbindungsleitungen an die Baueinheit zur Verfügung steht. Vorteilhaft ist der Kraftstofftank über mindestens ein Antivibrationselement vom Verbrennungsmotor schwingungsentkoppelt. Ein einfacher Aufbau ergibt sich, wenn das Antivibrationselement an dem Halter festgelegt ist. Zur Fixierung der Baueinheit an dem Kraftstofftank wird demnach ein ohnehin vorhandener Halter genutzt, der zur Fixierung des Antivibrationselements dient. Dadurch kann die Anzahl der benötigten Bauelemente für das Arbeitsgerät gering gehalten werden. Eine formschlüssige Fixierung kann jedoch auch auf andere Weise, beispielsweise über eine Schnappverbindung erfolgen. Insbesondere wird die Baueinheit von einem oder mehreren Schnappelementen, die am Kraftstofftank angeformt sind, formschlüssig gehalten. Dadurch können zusätzliche Bauelemente zur formschlüssigen Fixierung der Baueinheit entfallen, und es wird eine einfache Montage erreicht.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. Advantageously, 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. For fixing the assembly to the fuel tank therefore an already existing holder is used, which serves to fix the anti-vibration element. As a result, the number of required components for the implement can be kept low. However, a positive fixation can also be done in other ways, for example via a snap connection. In particular, the assembly of one or more snap elements, which are integrally formed on the fuel tank, held in a form-fitting manner. As a result, additional components for positive fixing of the unit can be omitted, and it is achieved a simple installation.
Der Kraftstofftank ist vorteilhaft an einem Griffgehäuse des Arbeitsgeräts integriert. An dem Griffgehäuse ist dabei mindestens ein Handgriff des Arbeitsgeräts gehalten. Der Handgriff ist vorteilhaft in das Griffgehäuse integriert. Das Griffgehäuse ist ein komplexes Bauteil und bildet insbesondere ein tragendes Gehäuseteil des Arbeitsgeräts, an dem andere Baugruppen wie beispielsweise ein Motorgehäuse gehalten sind. Der Kraftstofftank bildet einen Teil des Griffgehäuses.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.
Es ist vorgesehen, dass die Förderpumpe einen vom Bediener zu betätigenden Pumpenbalg besitzt. Der Pumpenbalg ist vorteilhaft raumnah zu mindestens einem weiteren Bedienelement des Arbeitsgeräts, insbesondere zu einem Gashebel des Arbeitsgeräts angeordnet. Der Pumpenbalg ist vorteilhaft benachbart zu einem Handgriff des Arbeitsgeräts, insbesondere benachbart zu einem hinteren Handgriff des Arbeitsgeräts angeordnet. Benachbart zum Pumpenbalg ist vorteilhaft auch ein Stoppschalter des Arbeitsgeräts angeordnet. Durch die raumnahe Anordnung von Gashebel, Pumpenbalg und Stoppschalter ergibt sich eine einfache, für den Bediener selbsterklärende Benutzung. Die Bedienelemente sind in unmittelbarer räumlicher Nähe zueinander und dadurch für den Bediener leicht auffindbar und leicht bedienbar angeordnet. Unmittelbare räumliche Nähe ist insbesondere dann gegeben, wenn der Bediener mit einer Hand den hinteren Handgriff des Arbeitsgeräts halten und gleichzeitig, beispielsweise mit dem Daumen der gleichen Hand, den Pumpenbalg bzw. den Stoppschalter betätigen kann.It is envisaged that 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.
Vorteilhaft besitzt die Baueinheit ein Pumpengehäuse, das die Kraftstoffpumpe und die Förderpumpe begrenzt. Vorteilhaft ist das Pumpengehäuse in Längsrichtung des Arbeitsgeräts vollständig in der Vertiefung angeordnet. In Längsrichtung des Arbeitsgeräts steht vorteilhaft nur der Pumpenbalg über die Rückseite des Kraftstofftanks hinaus. Dadurch ergibt sich eine ansprechende äußere Gestalt des Arbeitsgeräts. Durch die Integration des Pumpengehäuses in den Kraftstofftank kann auf einfache Weise vermieden werden, dass außer dem vom Bediener zu betätigenden Pumpenbalg weitere Teile der Baueinheit über das Gehäuse des Arbeitsgeräts hinausstehen, an denen der Bediener hängen bleiben könnte oder die den Bediener bei der Bedienung stören könnten.Advantageously, the assembly has a pump housing which limits the fuel pump and the delivery pump. Advantageously, 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 ,
Die Kraftstoffpumpe ist vorteilhaft eine Membranpumpe, die vom schwankenden Druck in einem Kurbelgehäuse des Verbrennungsmotors angetrieben ist.The fuel pump is advantageously a diaphragm pump, which is driven by the fluctuating pressure in a crankcase of the internal combustion engine.
Eine einfache Gestaltung ergibt sich, wenn das Pumpengehäuse mindestens teilweise am Kraftstofftank angeformt ist. Dadurch kann die Anzahl der benötigten Bauteile verringert werden. Vorteilhaft werden auch Kraftstoffleitungen am Kraftstofftank integriert, so dass zusätzliche Verbindungsleitungen hierfür entfallen können. Vorteilhaft umfasst die Baueinheit einen in dem Pumpengehäuse angeordneten Druckregler, der in Förderrichtung des Kraftstoffs stromab der Kraftstoffpumpe angeordnet ist. Der Druckregler besitzt vorteilhaft eine Regelmembran, die eine Regelkammer von einem Rückraum trennt. Ein vorteilhafter Aufbau ergibt sich, wenn der Rückraum mindestens teilweise von dem Kraftstofftank begrenzt ist.A simple design results when the pump housing is at least partially formed on the fuel tank. As a result, the number of required components can be reduced. Advantageously, fuel lines are integrated on the fuel tank, so that additional connecting lines can be omitted for this purpose. 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. An advantageous construction results when the rear space is at least partially bounded by the fuel tank.
Vorteilhaft besitzt die Tankwand benachbart zu der Baueinheit eine Verbindungsöffnung. In die Baueinheit ist vorteilhaft eine Ansaugleitung integriert, die den Tankinnenraum mit der Kraftstoffpumpe verbindet. Über die Verbindungsöffnung und die Ansaugleitung kann die Kraftstoffpumpe auf einfache Weise mit dem Tankinnenraum verbunden werden. Dadurch ergibt sich ein einfacher Aufbau. Eine als separater Schlauch ausgebildete Ansaugleitung kann entfallen. Die Montage wird vereinfacht, da kein Anschluss der Ansaugleitung erfolgen muss. Die integrierte Ansaugleitung wird bei der Montage der Baueinheit am Kraftstofftank mit der Verbindungsöffnung verbunden. Die Abdichtung kann auf einfache Weise zwischen dem Pumpengehäuse der Baueinheit und der Tankwand erfolgen.Advantageously, the tank wall adjacent to the assembly has a connection opening. In the assembly advantageously 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.
Ein Ausführungsbeispiel der Erfindung wird im Folgenden anhand der Zeichnung erläutert. Es zeigen:
- Fig. 1
- eine perspektivische Darstellung einer Motorsäge,
- Fig. 2
- eine schematische Seitenansicht der Motorsäge aus
Fig. 1 , - Fig. 3
- eine vergrößerte Darstellung des Bereichs der Bedienelemente der Motorsäge aus
Fig. 1 , - Fig. 4
- eine perspektivische Darstellung des Griffgehäuses der Motorsäge aus
Fig. 1 , - Fig. 5
- eine schematische Darstellung des Kraftstoffsystems der Motorsäge aus
Fig. 1 , - Fig. 6
- eine ausschnittsweise Explosionsdarstellung des Bereichs der Bedienelemente der Motorsäge aus
Fig. 1 , - Fig. 7
- eine Explosionsdarstellung des Bereichs der Kraftstoffpumpe des Griffgehäuses aus
Fig. 4 , - Fig. 8
- einen Schnitt durch das Griffgehäuse im Bereich der Kraftstoffpumpe,
- Fig. 9
- den Bereich der Kraftstoffpumpe aus
Fig. 8 in vergrößerter Darstellung, - Fig. 10
und 11 - ausschnittsweise Schnittdarstellungen des Bereichs der Kraftstoffpumpe bei weiteren Ausführungsbeispielen der Motorsäge aus
Fig. 1 .
- Fig. 1
- a perspective view of a power saw,
- Fig. 2
- a schematic side view of the chainsaw
Fig. 1 . - Fig. 3
- an enlarged view of the range of the operating elements of the chainsaw
Fig. 1 . - Fig. 4
- a perspective view of the handle housing of the chainsaw
Fig. 1 . - Fig. 5
- a schematic representation of the fuel system of the chainsaw
Fig. 1 . - Fig. 6
- a fragmentary exploded view of the range of the operating elements of the chainsaw
Fig. 1 . - Fig. 7
- an exploded view of the area of the fuel pump of the handle housing
Fig. 4 . - Fig. 8
- a section through the handle housing in the region of the fuel pump,
- Fig. 9
- the area of the fuel pump
Fig. 8 in an enlarged view, - 10 and 11
- Sectional sectional views of the range of the fuel pump in further embodiments of the chainsaw
Fig. 1 ,
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An der Oberseite 63 des Kraftstofftanks 12 ist ein erster Anschlussstutzen 27 angeordnet, an dem eine Ansaugleitung 24 angeschlossen ist. An der Oberseite 63 des Kraftstofftanks 12 ist außerdem ein zweiter Anschlussstutzen 28 vorgesehen, der zum Anschluss einer Rücklaufleitung von einem Kraftstoffventil dienen kann. Die Ansaugleitung 24 mündet ins Pumpengehäuse 21. Am Pumpengehäuse 21 sind außerdem eine Kraftstoffleitung 25 zur Zufuhr von Kraftstoff zu einem Kraftstoffventil sowie eine Impulsleitung 26 zur Verbindung mit einem Kurbelgehäuse des Verbrennungsmotors 18 angeschlossen.On the
Der Speicherraum 38 ist über ein Einlassventil 37 mit einer Regelkammer 41 eines Druckreglers 40 verbunden. Die Regelkammer 41 ist von einer Regelmembran 42 begrenzt, die die Regelkammer 41 von einem Rückraum 43 trennt. Die Regelmembran 42 ist von einer Feder 44 vorgespannt. Das Einlassventil 37 besitzt eine Ventilnadel 39, die an einem Hebel 45 gelagert ist. Der Hebel 45 koppelt die Position der Regelmembran 42 an die Stellung des Einlassventils 37. Sinkt der Druck in der Regelkammer 41, so wird die Regelmembran 42 zur Regelkammer 41 hin ausgelenkt. Diese Bewegung öffnet das Einlassventil 37, so dass Kraftstoff aus dem Speicherraum 38 in die Regelkammer 41 einströmt, bis der Druck in der Regelkammer 41 so hoch ist, dass die Regelmembran 42 das Einlassventil 37 über den Hebel 45 wieder schließt. Der Rückraum 43 ist über eine Öffnung 46 mit einem Referenzdruck beaufschlagt, vorteilhaft mit dem Umgebungsdruck.The
Die Regelkammer 41 ist über die Kraftstoffleitung 25 mit einem Druckdämpfer 53 und einem Kraftstoffventil 60 verbunden. Am Austritt aus der Regelkammer 41 ist ein Kraftstoffsieb 47 angeordnet. Im Pumpengehäuse 21 ist außerdem eine Förderpumpe 48 angeordnet, die den Pumpenbalg 8, ein Einlassventil 49 und ein Auslassventil 50 umfasst. Stromab des Abzweigs zum Einlassventil 49 und stromauf der Mündung des Auslassventils 50 in die Kraftstoffleitung 25 ist ein Rückschlagventil 51 angeordnet, das in Strömungsrichtung vom Druckdämpfer 53 zum Druckregler 40 schließt. Beim Betätigen des Pumpenbalgs 8 wird Kraftstoff aus dem Innenraum des Pumpenbalgs 8 über das Auslassventil 50 in die Kraftstoffleitung 25 gedrückt. Beim Loslassen des Pumpenbalgs 8 wird Kraftstoff aus der Regelkammer 41 über das Einlassventil 49 in den Pumpenbalg 8 angesaugt. Die Förderpumpe 48 dient dazu, das Kraftstoffsystem vor dem Starten des Verbrennungsmotors 18 zu fluten. Dadurch wird sichergestellt, dass beim Starten des Verbrennungsmotors 18 Kraftstoff am Kraftstoffventil 60 ansteht. Die Kraftstoffpumpe 33 kann Kraftstoff erst dann fördern, wenn der Verbrennungsmotor 18 läuft, da sie vom schwankenden Druck im Kurbelgehäuse 61 angetrieben ist.The
Die Kraftstoffpumpe 33, der Druckregler 40 und die Förderpumpe 48 sind in dem gemeinsamen Pumpengehäuse 21 angeordnet und bilden eine Baueinheit 76, die in der Vertiefung 20 (
Der Druckdämpfer 53 ist mit dem Kraftstoffventil 60 zusammen in einem gemeinsamen Ventilhalter 52 angeordnet. Der Druckdämpfer 53 ist vorteilhaft unmittelbar benachbart zum Kraftstoffventil 60 in der Kraftstoffleitung 25 angeordnet. Das Kraftstoffventil 60 führt den Kraftstoff vorteilhaft ins Kurbelgehäuse 61 zu. Der Ventilhalter 52 kann am Kurbelgehäuse 61 fixiert sein.The
Der Druckdämpfer 53 besitzt einen Dämpfungsraum 54, in den Kraftstoff aus der Kraftstoffleitung 25 einströmt. Der Dämpfungsraum 54 ist von einer Dämpfungsmembran 55 begrenzt, die den Dämpfungsraum 54 von einem Rückraum 57 trennt. Die Dämpfungsmembran 55 ist von einer Feder 56 vorgespannt. Die Vorspannkraft der Feder 56 bestimmt die Lage der Dämpfungsmembran 55 beim Betriebsdruck. Der Rückraum 57 ist über eine Öffnung 58 mit einem Referenzdruck, vorteilhaft dem Umgebungsdruck, beaufschlagt.The
Vom Kraftstoffventil 60 führt eine Entlastungsleitung 59 zum Kraftstofftank 12 zurück. In der Entlastungsleitung 59 ist ein Rückschlagventil 62 angeordnet. Vorteilhaft öffnet das Rückschlagventil 62 bei einem Druck, der etwas größer als der Betriebsdruck ist. Dadurch kann mit der manuellen Förderpumpe 48 beim Starten des Verbrennungsmotors 18 ein Druck am Kraftstoffventil 60 erzeugt werden, der etwas größer als der Betriebsdruck ist.From the
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Wie
In
Das Pumpengehäuse 21 besitzt einen Gehäusegrundkörper 78, der vom Gehäuseboden 80 durch die Regelmembran 42 und eine Dichtung 88 getrennt ist. Die Dichtung 88 kann auch an der Regelmembran 42 integriert sein. Im Gehäusegrundkörper 78 ist an der dem Gehäuseboden 80 zugewandten Seite die Regelkammer 41 ausgebildet. In der Regelkammer 41 ist der Hebel 45 gelagert. Der Hebel 45 ist von einer Feder 87 beaufschlagt. An der dem Gehäuseboden 80 gegenüberliegenden Seite des Gehäusegrundkörpers ist ein Gehäuseoberteil 79 angeordnet. An der dem Gehäuseoberteil 79 zugewandten Seite mündet die Impulsleitung 26 am Gehäusegrundkörper 78. Zwischen dem Gehäusegrundkörper 78 und dem Gehäuseoberteil 79 ist die Pumpenmembran 86 der Kraftstoffpumpe 33 angeordnet. Im Gehäuseoberteil 79 ist der Pumpenraum 35 ausgebildet. Am Gehäuseoberteil 79 ist an der dem Gehäusegrundkörper 78 abgewandten Seite der Pumpenbalg 8 gehalten. Der Pumpenbalg 8 ist von einem Gehäusedeckel 85 fixiert, der am Gehäuseoberteil 79 verschraubt ist. Im Pumpenbalg 8 ist eine Feder 75 angeordnet, die den Pumpenbalg 8 in seine unbetätigte Stellung federt und sicherstellt, dass der Pumpenbalg 8 nach der Betätigung in seine Ausgangslage zurückkehrt.The
Es kann auch vorgesehen sein, die Ansaugleitung 24 unmittelbar zwischen Pumpengehäuse 21 und der daran angrenzenden Wand des Kraftstofftanks 21 vorzusehen.
Claims (19)
dadurch gekennzeichnet, dass die Baueinheit (76, 90, 96) mindestens teilweise an der Tankwand (94) angeordnet ist.Implement with an internal combustion engine (18) for driving a tool of the working device, with a fuel pump (33) which is driven by the internal combustion engine (18) and fuel from a fuel tank (12) to the internal combustion engine (18) promotes, and with a manually from Operable operator pump (48), wherein the fuel pump (33) and the feed pump (48) form a structural unit (76, 90, 96) which is arranged outside of the fuel tank (12), wherein the fuel tank (12) a the tank interior (95) has a limiting tank wall (94),
characterized in that the assembly (76, 90, 96) is at least partially disposed on the tank wall (94).
dadurch gekennzeichnet, dass die Baueinheit (76, 90, 96) mindestens teilweise in einer Vertiefung (20) des Kraftstofftanks (12) angeordnet ist.Working device according to claim 1,
characterized in that the assembly (76, 90, 96) at least partially in a recess (20) of the fuel tank (12) is arranged.
dadurch gekennzeichnet, dass der Kraftstofftank (12) eine in üblicher Abstellposition (67) des Arbeitsgeräts oben angeordnete Oberseite (63), eine dem Werkzeug abgewandte Rückseite (65), eine in üblicher Abstellposition (67) unten angeordnete Unterseite (66) und mindestens eine Längsseite (64) besitzt.Tool according to claim 1 or 2,
characterized in that the fuel tank (12) in a conventional parking position (67) of the implement top arranged top (63), a tool facing away from the back (65), a conventional parking position (67) arranged below bottom (66) and at least one Long side (64) has.
dadurch gekennzeichnet, dass mindestens etwa 50% der in Abstellposition (67) in Wirkrichtung (89) der Schwerkraft gemessenen Höhe (b) der Baueinheit (76, 90, 96) in Abstellposition (67) unterhalb des obersten Bereichs der Oberseite (63) und oberhalb des untersten Bereichs der Unterseite (66) des Kraftstofftanks (12) angeordnet ist.Working device according to claim 3,
characterized in that at least about 50% of the measured in the parking position (67) in the effective direction (89) of gravity height (b) of the assembly (76, 90, 96) in the parking position (67) below the uppermost region of the top (63) and is disposed above the lowermost portion of the underside (66) of the fuel tank (12).
dadurch gekennzeichnet, dass die Vertiefung (20) sich an der Oberseite (63) und an der Rückseite (65) des Kraftstofftanks (12) erstreckt.Working device according to claim 3 or 4,
characterized in that the depression (20) extends at the upper side (63) and at the rear side (65) of the fuel tank (12).
dadurch gekennzeichnet, dass die Vertiefung (20) an der dem Verbrennungsmotor (18) abgewandten Seite des Kraftstofftanks (12) angeordnet ist.Tool according to one of claims 2 to 5,
characterized in that the recess (20) on the said internal combustion engine (18) facing away from the fuel tank (12) is arranged.
dadurch gekennzeichnet, dass die Baueinheit (76, 90, 96) formschlüssig an dem Kraftstofftank (12) gehalten ist.Tool according to one of claims 1 to 6,
characterized in that the structural unit (76, 90, 96) is held in a form-fitting manner on the fuel tank (12).
dadurch gekennzeichnet, dass die Baueinheit (76, 90, 96) von einem Halter (22) formschlüssig an dem Kraftstofftank (12) gehalten ist, wobei der Halter (22) die Lage der Baueinheit (76, 90, 96) in mindestens zwei senkrecht zueinander stehenden Raumrichtungen (y, z) festlegt.Working device according to claim 7,
characterized in that the structural unit (76, 90, 96) by a holder (22) is positively held on the fuel tank (12), wherein the holder (22), the position of the assembly (76, 90, 96) in at least two perpendicular mutually adjoining spatial directions (y, z) determines.
dadurch gekennzeichnet, dass der Kraftstofftank (12) über mindestens ein Antivibrationselement (19) von dem Verbrennungsmotor (18) schwingungsentkoppelt ist, wobei das Antivibrationselement (19) an dem Halter (22) festgelegt ist.Tool according to claim 7 or 8,
characterized in that the fuel tank (12) via at least one anti-vibration element (19) from the engine (18) is vibration-decoupled, wherein the anti-vibration element (19) on the holder (22) is fixed.
dadurch gekennzeichnet, dass der Kraftstofftank (12) an einem Griffgehäuse (2) des Arbeitsgeräts integriert ist.Tool according to one of claims 1 to 9,
characterized in that the fuel tank (12) on a handle housing (2) of the working device is integrated.
dadurch gekennzeichnet, dass die Förderpumpe (48) einen vom Bediener zu betätigenden Pumpenbalg (8) besitzt.Tool according to one of claims 1 to 10,
characterized in that the feed pump (48) has a pump bellows (8) to be operated by the operator.
dadurch gekennzeichnet, dass der Pumpenbalg (8) raumnah zu mindestens einem weiteren Bedienelement des Arbeitsgeräts, insbesondere zu einem Gashebel (6) des Arbeitsgeräts angeordnet ist.Tool according to claim 11,
characterized in that the pump bellows (8) is arranged close to space to at least one further operating element of the working device, in particular to a throttle lever (6) of the working device.
dadurch gekennzeichnet, dass die Baueinheit (76, 90, 96) ein Pumpengehäuse (21) besitzt, das die Kraftstoffpumpe (33) und die Förderpumpe (48) begrenzt.Tool according to one of claims 1 to 12,
characterized in that the assembly (76, 90, 96) has a pump housing (21) defining the fuel pump (33) and the delivery pump (48).
dadurch gekennzeichnet, dass das Pumpengehäuse (21) in einer Längsrichtung (91) des Arbeitsgeräts vollständig in der Vertiefung (20) angeordnet ist.Working device according to claim 13,
characterized in that the pump housing (21) in a longitudinal direction (91) of the working device is arranged completely in the recess (20).
dadurch gekennzeichnet, dass die Kraftstoffpumpe (33) eine Membranpumpe ist, die vom schwankenden Druck in einem Kurbelgehäuse (61) des Verbrennungsmotors (18) angetrieben ist.Tool according to one of claims 1 to 14,
characterized in that the fuel pump (33) is a diaphragm pump driven by fluctuating pressure in a crankcase (61) of the internal combustion engine (18).
dadurch gekennzeichnet, dass das Pumpengehäuse (21) mindestens teilweise an dem Kraftstofftank (12) angeformt ist.Tool according to one of claims 13 to 15,
characterized in that the pump housing (21) is at least partially formed on the fuel tank (12).
dadurch gekennzeichnet, dass die Baueinheit (76, 90, 96) einen in einem Pumpengehäuse (21) angeordneten Druckregler (40) umfasst, der in Förderrichtung des Kraftstoffs stromab der Kraftstoffstoffpumpe (33) angeordnet ist, wobei der Druckregler (40) eine Regelmembran (42) besitzt, die eine Regelkammer (41) von einem Rückraum (43) trennt.Tool according to one of claims 1 to 16,
characterized in that the structural unit (76, 90, 96) comprises a pressure regulator (40) arranged in a pump housing (21), which is arranged downstream of the fuel pump (33) in the conveying direction of the fuel, the pressure regulator (40) comprising a control diaphragm (40). 42) which separates a control chamber (41) from a rear space (43).
dadurch gekennzeichnet, dass der Rückraum (43) mindestens teilweise von dem Kraftstofftank (12) begrenzt ist.Tool according to claim 16,
characterized in that the rear space (43) is at least partially bounded by the fuel tank (12).
dadurch gekennzeichnet, dass die Tankwand (94) benachbart zu der Baueinheit (96) eine Verbindungsöffnung (97) besitzt und dass in die Baueinheit (96) eine Ansaugleitung (98) integriert ist, die den Tankinnenraum (95) mit der Kraftstoffpumpe (33) verbindet.Tool according to one of claims 1 to 18,
characterized in that the tank wall (94) adjacent to the assembly (96) has a connection opening (97) and that in the assembly (96) an intake pipe (98) is integrated, the tank interior (95) with the fuel pump (33). combines.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012007617.7A DE102012007617B4 (en) | 2012-04-18 | 2012-04-18 | Implement with a fuel pump |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2653695A2 true EP2653695A2 (en) | 2013-10-23 |
EP2653695A3 EP2653695A3 (en) | 2013-10-30 |
EP2653695B1 EP2653695B1 (en) | 2015-06-10 |
Family
ID=48183986
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13001921.9A Active EP2653695B1 (en) | 2012-04-18 | 2013-04-12 | Tool comprising a fuel pump |
Country Status (4)
Country | Link |
---|---|
US (1) | US9181864B2 (en) |
EP (1) | EP2653695B1 (en) |
CN (1) | CN103375320B (en) |
DE (1) | DE102012007617B4 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2873848A1 (en) * | 2013-11-19 | 2015-05-20 | Andreas Stihl AG & Co. KG | Manually operated working device having a pump, pump and pump bellows |
EP3181856A3 (en) * | 2015-12-15 | 2017-07-05 | Andreas Stihl AG & Co. KG | Manually operated working device having a control device |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US9322371B2 (en) * | 2014-04-09 | 2016-04-26 | Champion Engine Technology, LLC | Slide-in mountable fuel pump assembly |
CN103993997B (en) * | 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 | A kind of new work engine fuel oil drives equipment |
US10451019B2 (en) * | 2015-07-09 | 2019-10-22 | Caterpillar Inc. | Starter device for a prime mover |
DE102015016484A1 (en) * | 2015-12-15 | 2017-06-22 | Andreas Stihl Ag & Co. Kg | Manually operated feed pump and fuel system with a feed pump |
DE102018004881A1 (en) * | 2018-06-19 | 2019-12-19 | Andreas Stihl Ag & Co. Kg | Carburetor and hand-held implement with an internal combustion engine with a carburetor |
DE112021005043T5 (en) * | 2020-10-26 | 2023-09-14 | Husqvarna Ab | Fuel supply assembly, two-stroke engine and power tool |
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- 2013-04-12 EP EP13001921.9A patent/EP2653695B1/en active Active
- 2013-04-12 US US13/862,162 patent/US9181864B2/en active Active
- 2013-04-18 CN CN201310135051.0A patent/CN103375320B/en active Active
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DE10120127A1 (en) | 2001-04-25 | 2002-10-31 | Stihl Maschf Andreas | carburetor |
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EP2873848A1 (en) * | 2013-11-19 | 2015-05-20 | Andreas Stihl AG & Co. KG | Manually operated working device having a pump, pump and pump bellows |
EP3181856A3 (en) * | 2015-12-15 | 2017-07-05 | Andreas Stihl AG & Co. KG | Manually operated working device having a control device |
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 |
---|---|
CN103375320A (en) | 2013-10-30 |
US9181864B2 (en) | 2015-11-10 |
DE102012007617A1 (en) | 2013-10-24 |
CN103375320B (en) | 2017-06-13 |
EP2653695A3 (en) | 2013-10-30 |
US20130276724A1 (en) | 2013-10-24 |
DE102012007617B4 (en) | 2014-11-13 |
EP2653695B1 (en) | 2015-06-10 |
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