EP3772593B1 - Outil de travail motorisé avec carter de ventilateur de refroidissement renforcé - Google Patents

Outil de travail motorisé avec carter de ventilateur de refroidissement renforcé Download PDF

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Publication number
EP3772593B1
EP3772593B1 EP19190671.8A EP19190671A EP3772593B1 EP 3772593 B1 EP3772593 B1 EP 3772593B1 EP 19190671 A EP19190671 A EP 19190671A EP 3772593 B1 EP3772593 B1 EP 3772593B1
Authority
EP
European Patent Office
Prior art keywords
connecting strut
side wall
working device
fan
drive motor
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.)
Active
Application number
EP19190671.8A
Other languages
German (de)
English (en)
Other versions
EP3772593A8 (fr
EP3772593A1 (fr
Inventor
Daniel Sasse
Günter Wolf
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
Priority to EP19190671.8A priority Critical patent/EP3772593B1/fr
Priority to ES19190671T priority patent/ES2945110T3/es
Publication of EP3772593A1 publication Critical patent/EP3772593A1/fr
Publication of EP3772593A8 publication Critical patent/EP3772593A8/fr
Application granted granted Critical
Publication of EP3772593B1 publication Critical patent/EP3772593B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P1/00—Air cooling
    • F01P1/02—Arrangements for cooling cylinders or cylinder heads, e.g. ducting cooling-air from its pressure source to cylinders or along cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P5/06—Guiding or ducting air to, or from, ducted fans
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/626—Mounting or removal of fans
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/008—Cooling means

Definitions

  • the invention relates to an implement of the type specified in the preamble of claim 1.
  • a tool namely a brush cutter, known with a drive motor.
  • the drive motor drives a working unit, namely a knife blade, in rotation.
  • a fan wheel driven by the drive motor serves to cool the drive motor.
  • a side wall of the fan housing is held on the drive motor.
  • a connection structure which includes the guide tube and the working unit of the working device, connects to the opposite side wall of the fan housing. The fan housing is therefore in the axial direction between the drive motor and the working unit. It has been shown that when a different, in particular a heavier and/or stiffer connection structure is connected, damage or premature wear can occur on the fan housing.
  • the invention is based on the object of creating a working device of the generic type which has a long service life.
  • the drive motor usually forms a rigid structure.
  • the fan space has a comparatively large diameter in order to be able to convey a sufficiently large amount of cooling air.
  • the structure formed from the two side walls and the peripheral wall of the fan space is comparatively soft and deformable.
  • the guide tube is designed as a long, comparatively thin tube. Therefore, the guide tube also forms a soft structure. In the case of a brush cutter, vibrations generated by the engine during operation can therefore be absorbed to a large extent by the guide tube, which is excited to corresponding vibrations.
  • connection structure means all elements that connect to the second side wall.
  • the connection structure also includes the working unit, for example a tool of the working device.
  • a connecting strut is provided which protrudes through the fan space between the circumference of the fan wheel and the peripheral wall and connects the first side wall to the second side wall. Because the connecting strut is arranged between the circumference of the fan wheel and the circumferential wall, ie radially inside the circumferential wall, the distance between the connecting strut and the axis of rotation of the fan wheel is comparatively small compared to stiffening elements arranged outside the fan space. This is for a desired stiffening of the Fan housing requires a connecting strut with a comparatively small cross section. Even with a small increase in the overall weight of the implement, a very significant increase in the stability of the implement can be achieved.
  • a stiffening for example on the outside of the peripheral wall of the fan housing, which would have to be very solid due to the large distance from the axis of rotation of the fan wheel and would therefore lead to a significant increase in the weight of the working device, can be avoided by the connecting strut according to the invention.
  • the terminal structure is advantageously a comparatively heavy structure.
  • the weight of the connection structure is advantageously at least more than 1.5 kg, in particular more than 2 kg, preferably more than 3 kg.
  • the connecting strut is advantageously arranged upstream of the outlet opening.
  • the connecting strut advantageously has an angular distance of less than 90° from the outlet opening around the axis of rotation of the fan wheel.
  • the distance between the peripheral wall and the periphery of the fan wheel increases in the direction of flow of the cooling air being conveyed, at least in a section of the fan space.
  • the peripheral wall preferably runs essentially in a spiral shape around the axis of rotation.
  • the connecting strut is designed as a separate component and has at least one threaded section for the connection with an adjacent component.
  • the connecting strut has an internally threaded section with an internal thread into which a fastening screw is screwed. This allows an adjacent component to be attached to the connecting strut in a simple manner.
  • the connecting strut advantageously has a connecting section whose outside diameter is smaller than an outside diameter of the internally threaded section.
  • the internally threaded section and the connecting section are arranged at least partially, in particular completely, in the fan space.
  • the outside diameter of the connecting strut is reduced in the connecting section in order to provide the largest possible flow cross section.
  • a structurally predetermined minimum external diameter is advantageously provided in order to ensure sufficient strength for the internal thread.
  • the connecting strut has an externally threaded section with an external thread, which is screwed into a screw opening in a side wall.
  • the connecting strut can be screwed to one of the side walls with the externally threaded section.
  • the other side wall can be fixed to the connecting strut using a fastening screw that is screwed into the connecting strut from the outside.
  • the fastening screw can also be used to connect the connection structure. This results in a simple structure.
  • the connecting strut is designed in one piece with at least one side wall.
  • the connecting strut can be fixed to the opposite side wall, for example by means of a screw or the like.
  • the connecting strut is firmly fixed to both side walls to transfer forces generated during operation.
  • the drive motor is in particular an internal combustion engine with a crankcase that is formed from at least one crankcase component.
  • the connecting strut is advantageously fixed to the crankcase component.
  • the crankcase assembly may be formed as a high inertia load-bearing structure. Connecting the connecting strut to the crankcase component results in a firm and stable connection of the connecting strut.
  • the first side wall is preferably fixed directly to the crankcase component and the second side wall is fixed via the connecting strut.
  • the first side wall is molded onto the crankcase component of the drive motor. This results in a simple structure with few individual parts.
  • connection structure to include a gear housing in which a gear is arranged.
  • the drive unit is driven via the gearbox.
  • the implement can, for example, be a harvesting implement such as an olive shaker or the like.
  • the transmission advantageously converts the rotating drive movement of the drive motor into a reciprocating movement.
  • the drive unit is in particular a tool of the implement, for example a hook of an olive shaker, with which branches to be shaken can be gripped.
  • the working device is a pump and the working unit of the working device is the pump unit, which is driven by the drive motor.
  • a different connection structure with a different working unit can also be provided.
  • connection structure is screwed to the second side wall via at least one fastening screw.
  • the distance between the central axis of the fastening screw and the axis of rotation of the fan wheel is less than half the diameter of the fan wheel.
  • the central axis of the fastening screw is therefore located in such a way that the fastening screw intersects with the fan wheel in the viewing direction of the axis of rotation of the fan wheel.
  • the fastening screw cannot be screwed directly onto the first side wall or a structure located behind it. Instead, the forces acting between the motor unit and the working unit must have the Peripheral wall of the intermediate fan housing are transferred. Due to the relatively large distance between the peripheral wall and the axis of rotation, i.e. in particular to the neutral axis, high moments are at work.
  • connection structure is designed in one piece with part of the fan housing, in particular at least with part of the second side wall. At least part of the connection structure is preferably formed in one piece with the second side wall and particularly preferably additionally with part of the peripheral wall.
  • the peripheral wall is advantageously shifted radially outwards by at least half of the smallest diameter of the connecting strut, compared to a spiral course, at least over part of its width.
  • the reduction in the flow cross-section caused by the connecting strut can be at least partially compensated for by shifting the peripheral wall radially outwards.
  • a sufficient throughput of cooling air is achieved despite the connecting strut being arranged between the peripheral wall and the periphery of the fan wheel.
  • radial refers to the radial direction to the axis of rotation of the fan wheel.
  • the present invention is particularly advantageous when the terminal structure includes a housing formed of metal.
  • the connection structure has a high degree of rigidity or inertia.
  • the metal is in particular a light metal, preferably magnesium.
  • a different design of the housing of the connection structure can also be advantageous.
  • the working device 1 shows a working device 1.
  • the working device 1 is a hand-held working device, in the exemplary embodiment an olive shaker.
  • the present invention can also be used for other implements, both stationary and portable implements.
  • the working device can also be a pump, for example.
  • the working device comprises a motor unit 2 which is used to drive a working unit 7 .
  • the working unit 7 is formed by a hook 51 which is driven back and forth in the direction of a double arrow 48 during operation.
  • the hook 51 is held on a shank 6 which is movably guided in a guide tube 47 of the implement 1 .
  • the guide tube 47 is designed in one piece with a gear housing 25 .
  • the gear housing 25 is part of a gear unit 3.
  • a side handle 4 and a loop handle 5 are provided for guiding the implement 1, which are held on the gear unit 3.
  • the side handle 4 and bow handle 5 are advantageously held on the gear unit 3 via vibration damping elements.
  • the motor unit 2 comprises a motor housing 8.
  • the motor housing 8 can be designed as a closed housing. However, it can also be provided that the motor housing 8 is partially open and/or formed by several housing parts and/or covers.
  • a drive motor 9 is arranged in the motor housing 8 .
  • the drive motor 9 is designed as an internal combustion engine in the exemplary embodiment.
  • the drive motor 9 preferably has a 3 starter device 64 shown schematically.
  • a cooling air fan 10 is used to cool the drive motor 9 .
  • the drive motor 9 drives a drive shaft 22 in rotation about an axis of rotation 21 .
  • the cooling air fan 10 is driven via the drive shaft 22 .
  • the axis of rotation 21 corresponds to the axis of rotation of a fan wheel 16 of the cooling air fan 10.
  • the drive shaft 22 is connected to a gear 46 via a clutch 34, a centrifugal clutch in the exemplary embodiment.
  • the gear 46 is arranged in the gear housing 25 .
  • Gear 46 is provided to convert the rotary movement, which is transmitted from the drive shaft 22 via the clutch 34 to the input shaft 63 of the gear 46, into a reciprocating movement of the shaft 6 along the double arrow 48.
  • the gear housing 25 forms a very rigid structure.
  • the transmission housing 25 is preferably made of metal, in particular light metal, preferably magnesium.
  • the transmission housing 25 can be provided with stiffening struts to increase its rigidity. In 4 some of the stiffening struts 53 of the gearbox housing 25 are shown.
  • connection structure 19 which is connected to the cooling air fan 10 and is formed at least partially by the gear housing 25 in the exemplary embodiment.
  • the drive motor 9 includes a cylinder 24 and a crankcase 23.
  • the cooling air fan 10 and in 4 not shown starting device 64 ( 3 ) are located on opposite sides of the cylinder 24.
  • a carburetor 54 is provided for supplying the fuel/air mixture to the drive motor 9 . Any other type of fuel supply device can also be advantageous.
  • the crankcase 23 is formed by a first crankcase component 44 and a second crankcase component 45 .
  • the parting plane between the crankcase components 44 and 45 runs parallel to a 4 schematically entered cylinder longitudinal axis 55 of the cylinder 24.
  • figure 5 shows a section through the cooling air fan 10.
  • the in figure 5 shown section is not offset by the drive shaft 22, but this.
  • the fan housing 11 comprises a first side wall 13 and an opposite second side wall 14.
  • the fan housing 11 is formed by a peripheral wall 15 which extends from the first side wall 13 to the second side wall 14.
  • the first side wall 13, the second side wall 14 and the peripheral wall 15 delimit a fan space 12.
  • the Crankcase 23 is connected to the first side wall.
  • the first crankcase component 44 is formed in one piece with the first side wall 13 .
  • a fan wheel 16 is arranged in the fan space 12 and has a large number of blades 17 for conveying cooling air.
  • the fan wheel 16 is a radial fan that draws cooling air in relation to the axis of rotation 21 of the fan wheel 16 ( 3 ) promotes radially outwards. Cooling air is sucked in through suction openings 56, which are formed in the first side wall 13 and from which in figure 5 one is shown.
  • connection structure 19 is fixed to the second side wall 14 via fastening screws 26, of which figure 5 one is shown. Provision can also be made for the second side wall 14 to be formed in one piece with the connection structure 19 and thereby connected to it. However, this one-piece design is not part of the claimed subject matter. Another type of connection can also be provided.
  • connection structure 19 is connected to the drive motor 9 via the fan housing 11 .
  • the fan case 11 is a structure with low mass and low rigidity.
  • the mass of the fan housing 11 is advantageously less than 1.5 kg, in particular less than 1 kg.
  • the fan housing 11 has a mass of 0.3 to 0.8 kg.
  • the terminal structure 19 is advantageously a high mass structure.
  • the connection structure 19 advantageously has a mass of at least 1.5 kg, in particular at least 3 kg, preferably more than 5 kg.
  • the connection structure 19 has a mass of 7 kg to 9 kg.
  • the mass of the drive motor 9 is advantageously at least 1.5 kg, in particular at least 2 kg, preferably at least 3 kg. In the exemplary embodiment, a mass of 4 kg to 7 kg is provided.
  • the mass of the connection structure 19 is advantageously more than the mass of the drive motor 9.
  • the mass of the connection structure 19 is advantageously 1.1 to 3 times, in particular 1.2 to 2.3 times, preferably 1.3 to 1.8 times the mass of the drive motor 9.
  • the fan wheel 16 carries magnets 57, which are used to induce an ignition spark, as will be described in more detail below.
  • connection structure 19 cannot follow these vibrations due to its high rigidity.
  • the relative movements between the drive motor 9 and the connection structure 19 must therefore be absorbed by the fan housing 11 .
  • the first side wall 13 and the second side wall 14 have an in 6 connecting strut 20 shown mechanically to connect with each other. How 6 shows, the connecting strut 20 protrudes between the circumference 35 of the fan wheel 16 and the peripheral wall 15 through the fan space 12.
  • the connecting strut 20 is screwed into a screw opening 30.
  • the first side wall 13 is formed in one piece with the first crankcase component 44 .
  • the connecting strut 20 protrudes through the first side wall 13 into the screw opening 30 formed in the crankcase component 44 .
  • a fastening screw 42 is screwed into the connecting strut 20 through the second side wall 14 .
  • the second side wall 14 is formed on a housing part 27, namely a cover of the fan housing 11.
  • the connection structure 19 is screwed to the housing part 27 via fastening screws 26 . How 7 shows, the housing part 27 is fixed to the first crankcase component 44 via fastening screws 28 .
  • the fastening screws 26 for fixing the connection structure 19 to the housing part 27 are screwed into fastening openings 29, as well 7 shows.
  • the connecting strut 20 has an internal thread 39 for the fastening screw 42 .
  • the first side wall 13 and a part of the peripheral wall 15 are formed on the first crankcase component 44 .
  • the second side wall 14 and another part of the peripheral wall 15 are formed on the housing part 27 .
  • the end faces of the first crankcase component 44 and housing part 27 rest against one another ( 6 ) and thus form the entire peripheral wall 15.
  • a different configuration of the side walls 13 and 14 and of the peripheral wall 15 can also be advantageous.
  • the Figures 8 and 9 show the design of the connecting strut 20 in detail.
  • the connecting strut 20 has an externally threaded section 37 with an external thread 43 at one end.
  • the nominal diameter of the external thread 43 is based on the nominal diameter of the screw opening 30 ( Figures 6 and 7 ) matched in the crankcase component 44.
  • the connecting strut 20 has the support collar 50 for support on the first side wall 13 and a support collar 58 for support on the second side wall 14.
  • the support collar 58 has a gripping contour 49, in the exemplary embodiment a hexagonal contour, on which a tool can grip in order to move the connecting strut 20 with the external thread 43 into the screw opening 30 of the first crankcase component 44 ( Figures 6 and 7 ) to screw in.
  • the internally threaded section 36 and a connecting section 38 extend between the supporting collars 50 and 58.
  • the internally threaded section 36 has an internal thread 39 for the fastening screw 42 ( Figures 6 and 7 ) on.
  • the internally threaded section 36 has an outside diameter e which is larger than the outside diameter f in the connecting section 38 .
  • the connecting strut 20 is preferably solid.
  • the connecting strut 20 has a central axis 31 .
  • the central axis 31 has a distance c from the axis of rotation 21 .
  • the first crankcase component 44 has the fastening openings 59 for the fastening screws 28 ( 7 ).
  • the fastening openings 59 each have a central axis 32 which is at a distance b from the axis of rotation 21 .
  • the distance b can for the different Mounting holes 59 may be different. All fastening openings 59 are outside of the peripheral wall 15.
  • the distance b of at least one central axis 32 of a fastening opening 59 to the axis of rotation 21 is greater than the distance c of the central axis 31 of the connecting strut 20 to the axis of rotation 21.
  • the distance b of all central axes 32 to the axis of rotation 21 is preferably greater as the distance between the central axis 31 and the axis of rotation 21.
  • the peripheral wall 15 is at a distance d from the axis of rotation 21 which increases in the direction of flow 41 at least in an angular range around the axis of rotation 21 .
  • the distance d is increased over a large part of the peripheral wall 15 in the direction of flow 41 .
  • crankcase component 44 from the side remote from the fan compartment 12 .
  • the crankcase component 44 defines a crankcase interior 52.
  • the crankcase interior 52 is also defined by the second crankcase component 45 ( 4 ) limited.
  • the position of the suction openings 56 is also shown.
  • the fan wheel 16 has a diameter h.
  • the distance d between the axis of rotation 21 and the peripheral wall 15 increases from a distance that is only slightly larger than half the diameter h of the fan wheel 16 to a distance d at the outlet opening 18 that is at least 1.2 times, preferably at least 1.3 times, in particular at least 1.4 times half the diameter h, ie the radius of the fan wheel 14 is.
  • a distance a is formed between the circumference 35 and the circumferential wall 15 , which distance increases continuously in the flow direction 41 at least in a region of the circumference 35 , preferably over a large part of the circumference 35 .
  • the cooling air leaves the fan space 12 through an outlet opening 18.
  • the outlet opening is arranged adjacent to the cylinder 42 of the drive motor 9 in the exemplary embodiment.
  • On cylinder 24 is an ignition module 60 fixed.
  • the ignition module 60 is arranged outside the fan space 12 in the exemplary embodiment. In the ignition module 60, the magnets 57 of the fan wheel 12 induce the energy for generating an ignition spark.
  • the connecting strut 20 is arranged upstream of the outlet opening 18 in relation to the direction of flow 41 . Accordingly, the cooling air first flows past the connecting strut 20 and then through the outlet opening 18 .
  • the connecting strut 20 is arranged in front of the outlet opening 18 in the direction of flow 41 .
  • the connecting strut 20 is at an angular distance ⁇ from the outlet opening 18 around the axis of rotation 21 of the fan wheel 16 .
  • the angular distance ⁇ is advantageously less than 90°, in particular less than 60°.
  • An angle ⁇ of less than 45° is preferably provided.
  • the angular distance ⁇ is less than 30°, preferably less than 15°.
  • the distance a between the circumference 35 of the fan wheel 16 and the circumferential wall 15 is comparatively large in the circumferential angular range in which the connecting strut 20 is arranged.
  • the distance a at the outlet opening 18 is advantageously at least 15 mm, in particular at least 20 mm.
  • the distance a at the outlet opening 18 is advantageously at least 10%, in particular at least 15%, preferably at least 20% of the diameter h of the fan wheel 16.
  • the fan space 12 has a width m on the connecting strut 15, which is 6 is registered.
  • the width m is significantly smaller than the diameter h of the fan wheel 16 ( 12 ).
  • the width m is advantageously less than half the diameter h of the fan wheel 16, in particular less than 30% of the diameter h of the fan wheel 16.
  • the diameter h of the fan wheel 16 is advantageously 80 cm to 170 cm, in particular 90 cm to 150 cm.
  • the peripheral wall 15 is offset radially outward of the connecting strut 20 to the outside.
  • 12 is the spiral course of the peripheral wall 15 shown schematically with a dashed line 61 .
  • the peripheral wall 15 is offset by an offset k to the axis of rotation 21 radially outwards.
  • the offset k preferably compensates for the reduction in the flow cross section through the connecting strut 20 at least partially, preferably completely.
  • the offset k is advantageously at least 3 mm, in particular at least 5 mm.
  • the offset k is in particular less than 20 mm, preferably less than 15 mm.
  • the offset k is advantageously from 3% to 20%, in particular from 5% to 15% of the diameter h of the fan wheel 14.
  • the peripheral wall 15 is over at least part of its width m measured parallel to the axis of rotation, preferably over its entire width m. relative to the axis of rotation 21 shifted radially outwards.
  • the fastening screws 26 each have a central axis 33 .
  • the central axis 33 is at a distance g from the axis of rotation 21, which is 13 is located for one of the fastening screws 26.
  • the fastening screws 26 can have different distances g from the axis of rotation 21 . However, the same distance g for some or all fastening screws 26 can also be advantageous.
  • the position of the central axis 31 of the connecting strut 20 is shown schematically in a projection in the direction of the axis of rotation 21 .
  • the distance c between the central axis 31 of the connecting strut 20 and the axis of rotation 21 is greater than the distance g of the central axis 33 of the fastening screw 26.
  • all central axes 33 of the fastening screws 26 are within the projection in the viewing direction of the axis of rotation 21 Peripheral wall 15, i.e. between the axis of rotation 21 and the peripheral wall 15.
  • the distance g of at least one central axis 33 is less than half the diameter h of the fan wheel 16. It is therefore not possible with the same position of the central axes 33 of the fastening screws 26, the connection structure 19 through the Fan space 12 through, set directly on the first crankcase component 44 or the first side wall 13.
  • the distance g of at least one, in particular all, central axes 33 is significantly smaller than the distance b of one, in particular all, central axes 32 of the fastening screws 28 with which the housing part 27 is fixed to the first crankcase component 44 .
  • connecting strut 20′ shows an alternative embodiment for a connecting strut 20'.
  • the structure of the connecting strut 20′ corresponds to the structure of the connecting strut 20 in the area arranged between the side walls 13 and 14.
  • the connecting strut 20′ is, however, formed in one piece with the crankcase component 44 . It can be provided that the connecting strut 20 ′ is also formed in one piece with the second side wall 14 .
  • the connecting strut 20' is connected in one piece to one of the side walls 13, 14 and is fixed, in particular screwed, to the other of the side walls 13, 14.
  • the connecting strut 20' is preferably integrally formed on the first side wall 13 and the crankcase component 44 and is screwed to the second side wall 14 using a fastening screw 42, as shown in FIG 14 shown.
  • connecting strut 20, 20' can be designed to be flow-optimized in order to offer the lowest possible flow resistance to air flowing past.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Percussive Tools And Related Accessories (AREA)

Claims (14)

  1. Appareil de travail comprenant un moteur d'entraînement (9), une roue de ventilateur (16) servant au refoulement d'air de refroidissement pour le moteur d'entraînement (9) et une unité de travail (7) entraînée par le moteur d'entraînement (9), la roue de ventilateur (16) étant disposée dans un espace de ventilateur (12) qui est délimité au moins partiellement par une paroi périphérique (15), une première paroi latérale (13) et une deuxième paroi latérale (14), l'espace de ventilateur (12) présentant une ouverture de sortie (18) pour l'air de refroidissement refoulé, la distance (a) de la paroi périphérique (15) à la périphérie (35) de la roue de ventilateur (16) dans le sens d'écoulement (41) de l'air de refroidissement augmentant en direction de l'ouverture de sortie (18) au moins sur une région de la périphérie (35) de la roue de ventilateur (16), la première paroi latérale (13) se situant entre le moteur d'entraînement (9) et la deuxième paroi latérale (14) et une structure de raccordement (19) se raccordant à la deuxième paroi latérale (14), laquelle structure de raccordement entoure l'unité de travail (7),
    caractérisé en ce qu'au moins une barre de liaison (20, 20') est prévue, laquelle fait saillie à travers l'espace de ventilateur (12) entre la périphérie (35) de la roue de ventilateur (16) et la paroi périphérique (15) et relie la première paroi latérale (13) à la deuxième paroi latérale (14) et en ce que la structure de raccordement (19) est vissée par le biais d'au moins une vis de fixation (26) sur la deuxième paroi latérale (14), la distance (g) de l'axe médian (33) de la vis de fixation (26) à l'axe de rotation (21) de la roue de ventilateur (16) étant inférieure à la moitié du diamètre (h) de la roue de ventilateur (16).
  2. Appareil de travail selon la revendication 1,
    caractérisé en ce que la barre de liaison (20, 20') est disposée en amont de l'ouverture de sortie (18) par rapport au sens d'écoulement (41) de l'air de refroidissement refoulé.
  3. Appareil de travail selon la revendication 1 ou 2,
    caractérisé en ce que la barre de liaison (20, 20') présente, par rapport à l'ouverture de sortie (18), une distance angulaire (α) de moins de 90° autour de l'axe de rotation (21) de la roue de ventilateur (16).
  4. Appareil de travail selon l'une des revendications 1 à 3,
    caractérisé en ce que la barre de liaison (20) est réalisée comme composant séparé et présente au moins une partie filetée servant à la liaison à un composant adjacent.
  5. Appareil de travail selon la revendication 4,
    caractérisé en ce que la barre de liaison (20) présente une partie filetée intérieure (36) dotée d'un filetage intérieur (39) dans lequel une vis de fixation (42) est vissée.
  6. Appareil de travail selon la revendication 5,
    caractérisé en ce que la barre de liaison (20) présente une partie de liaison (38) dont le diamètre extérieur (f) est inférieur à un diamètre extérieur (e) de la partie filetée intérieure (36), la partie filetée intérieure (36) et la partie de liaison (38) étant disposées au moins partiellement dans l'espace de ventilateur (12).
  7. Appareil de travail selon l'une des revendications 4 à 6,
    caractérisé en ce que la barre de liaison (20) présente une partie filetée extérieure (37) dotée d'un filetage extérieur (43) qui est vissé dans une ouverture pour vis (30) dans une paroi latérale.
  8. Appareil de travail selon l'une des revendications 1 à 3,
    caractérisé en ce que la barre de liaison (20') est réalisée d'un seul tenant avec au moins une paroi latérale.
  9. Appareil de travail selon l'une des revendications 1 à 8,
    caractérisé en ce que le moteur d'entraînement (9) est un moteur à combustion interne doté d'un carter de vilebrequin (23) qui est formé à partir d'au moins un composant de carter de vilebrequin (44, 45).
  10. Appareil de travail selon la revendication 9,
    caractérisé en ce que la barre de liaison (20, 20') est fixée au composant de carter de vilebrequin (44).
  11. Appareil de travail selon la revendication 9 ou 10,
    caractérisé en ce que la première paroi latérale (13) est formée sur le composant de carter de vilebrequin (44) du moteur d'entraînement (9).
  12. Appareil de travail selon l'une des revendications 1 à 11,
    caractérisé en ce que la structure de raccordement (19) comporte un carter de transmission (25) dans lequel une transmission (46) est disposée, l'unité de travail (7) étant entraînée par le biais de la transmission (46).
  13. Appareil de travail selon l'une des revendications 1 à 12,
    caractérisé en ce que la paroi périphérique (15) est décalée radialement vers l'extérieur radialement à l'extérieur de la barre de liaison (20, 20') par rapport à une allure en forme de spirale au moins sur une partie de sa largeur, d'un décalage (k) qui vaut au moins la moitié du plus petit diamètre (f) de la barre de liaison (20, 20').
  14. Appareil de travail selon l'une des revendications 1 à 13,
    caractérisé en ce que la structure de raccordement (19) comporte un carter qui est formé à partir de métal.
EP19190671.8A 2019-08-08 2019-08-08 Outil de travail motorisé avec carter de ventilateur de refroidissement renforcé Active EP3772593B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19190671.8A EP3772593B1 (fr) 2019-08-08 2019-08-08 Outil de travail motorisé avec carter de ventilateur de refroidissement renforcé
ES19190671T ES2945110T3 (es) 2019-08-08 2019-08-08 Implemento motorizado con carcasa de ventilador de refrigeración reforzada

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19190671.8A EP3772593B1 (fr) 2019-08-08 2019-08-08 Outil de travail motorisé avec carter de ventilateur de refroidissement renforcé

Publications (3)

Publication Number Publication Date
EP3772593A1 EP3772593A1 (fr) 2021-02-10
EP3772593A8 EP3772593A8 (fr) 2021-03-17
EP3772593B1 true EP3772593B1 (fr) 2023-04-19

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ID=67587450

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19190671.8A Active EP3772593B1 (fr) 2019-08-08 2019-08-08 Outil de travail motorisé avec carter de ventilateur de refroidissement renforcé

Country Status (2)

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EP (1) EP3772593B1 (fr)
ES (1) ES2945110T3 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10021707A1 (de) 2000-05-04 2001-11-08 Stihl Maschf Andreas Handgeführtes Arbeitsgerät
MY143612A (en) * 2005-06-23 2011-06-15 Honda Motor Co Ltd Air-cooled engine

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Publication number Publication date
ES2945110T3 (es) 2023-06-28
EP3772593A8 (fr) 2021-03-17
EP3772593A1 (fr) 2021-02-10

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