EP4230355A1 - Appareil de travail portatif - Google Patents

Appareil de travail portatif Download PDF

Info

Publication number
EP4230355A1
EP4230355A1 EP22157839.6A EP22157839A EP4230355A1 EP 4230355 A1 EP4230355 A1 EP 4230355A1 EP 22157839 A EP22157839 A EP 22157839A EP 4230355 A1 EP4230355 A1 EP 4230355A1
Authority
EP
European Patent Office
Prior art keywords
section
housing
implement
working device
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.)
Withdrawn
Application number
EP22157839.6A
Other languages
German (de)
English (en)
Inventor
David Klett
Sebastian Piekarek
Jonathan Seiz
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 EP22157839.6A priority Critical patent/EP4230355A1/fr
Publication of EP4230355A1 publication Critical patent/EP4230355A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B25F5/02—Construction of casings, bodies or handles
    • 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
    • B25F5/006—Vibration damping means

Definitions

  • the invention relates to a portable work tool according to the preamble of claim 1.
  • the invention is based on the object of further developing a portable working device in such a way that the probability of damage to the housing in the event of a heavy load or a fall is minimized.
  • the second section of the implement has increased elasticity compared to the other two sections.
  • the second section of the implement is designed in such a way that the second section, acting as a spring element, couples the first section of the implement to the second section of the implement.
  • the compliance of the second section compared to the other two sections increased. Due to the design of the tool according to the invention, the tool can absorb loads and vibrations in such a way that the housing remains undamaged. Under such a load or shock, the first section may vibrate relative to the third section coupled through the second section.
  • the increased elasticity of the second section also allows the first section and the third section to move relative to one another. If the tool is heavily loaded during use, damage to the housing due to a stress-related crack in the housing is avoided.
  • the housing can yield to a load or to a force acting when the working device is used, without the housing breaking in the process.
  • Even large pivoting movements, which can act on the housing due to movements of the shaft and their transmission at great heights, can be intercepted by the elastic second section of the implement.
  • the housing has an overall length extending from the rear end of the housing to the front end of the housing.
  • the overall length is suitably measured in the direction of the longitudinal axis of the housing.
  • the second section of the implement has a length.
  • the length of the second section of the implement is also referred to as the second length.
  • the length of the second section is expediently measured in the direction of the longitudinal axis of the housing.
  • the length of the second section of the implement corresponds in particular to the distance, measured in the direction of the longitudinal axis of the housing, between the first section of the implement and the third section of the implement.
  • the length of the second section of the implement is advantageously at least 10% of the overall length of the housing.
  • the length of the second section of the housing is at least 15% of the total length of the housing of the implement.
  • the length of the second section of the implement is approximately 20% of the overall length of the housing.
  • the length of the second section of the implement is at most 50% of the overall length of the housing.
  • the length of the second section of the implement is at most 35% of the total length of the housing.
  • the length of the second section of the implement is at most 25% of the overall length of the housing.
  • the housing is formed from a thermoplastic material along its longitudinal axis at least in the region of the second section.
  • the thermoplastic material is expediently not reinforced by fibers or balls.
  • the thermoplastic is not fiber or ball reinforced.
  • the housing is preferably formed completely along its longitudinal axis from a thermoplastic material, in particular from a thermoplastic material that is not reinforced by fibers or balls.
  • the entire housing is expediently made of a thermoplastic material, in particular a thermoplastic material that is not reinforced by fibers or balls.
  • the modulus of elasticity of the thermoplastic material is at most 5000 N/mm 2 .
  • the modulus of elasticity of the thermoplastic is at most 3000 N/mm 2 .
  • the tool has almost exclusively, in particular a volume proportion of at least 90% by volume, materials that have a modulus of elasticity of no more than 5000 N/mm 2 , in particular of no more than 3000 N/mm 2 own.
  • the first section is not connected to the third section in the second section by means of components that increase the rigidity caused by the housing alone in the second section in a technically relevant manner.
  • the rigidity of the implement in the second section is expediently determined almost exclusively by the housing.
  • the rigidity of the second section is, viewed technically, solely determined by the housing in the second section.
  • the rigidity of the housing in the second section is determined exclusively by the shape of the housing and the material from which the housing is made.
  • the thermoplastic is expediently an ABS (acrylonitrile butadiene styrene) plastic.
  • the thermoplastic is an ABS (acrylonitrile butadiene styrene)/PA (polyamide) plastic.
  • An AB S/PA plastic consists of a mixture of an ABS plastic with a PA plastic.
  • the thermoplastic is a PA6 plastic.
  • a PA6 plastic is a type 6 PA plastic.
  • the designation type 6 is to be understood in accordance with DIN EN ISO 1043-1. In particular, all these types of plastic are not reinforced, in particular not reinforced by fibers or balls. Provision can also be made for the housing in the second section of the implement to be formed from an ABS plastic in a first area and from an ABB/PA plastic in a second area.
  • a first section arranged in the housing is provided in the first section Reinforcement unit provided.
  • the housing can have the same modulus of elasticity in the first section and in the second section and can be made from the same material. This makes it easier to manufacture the housing of the working device.
  • the rigidity in the first section can be increased in a simple manner by the first stiffening unit.
  • the lower elasticity in the first section of the implement is then brought about by the first stiffening unit arranged in the housing. Due to the interaction of the housing and the first stiffening unit, the rigidity of the implement in the first section is increased compared to the rigidity of the implement in the second section.
  • the drive motor is part of the first stiffening unit.
  • An external peripheral surface of the drive motor is advantageously part of the first stiffening unit.
  • the first stiffening unit is formed entirely by the drive motor.
  • the drive motor is expediently designed as an internal rotor. This makes it possible to use the entire circumference of the motor to increase rigidity.
  • the complete peripheral side of the drive motor is part of the first stiffening unit.
  • a structural element is expediently provided in the first section.
  • the structural element is assigned to the first stiffening unit.
  • the structural element is part of the first stiffening unit.
  • the drive motor is advantageously held in the housing via the structural element.
  • the structural element is expediently arranged between the drive motor and the housing. It can be provided that the structural element is an integral part of the housing.
  • the structural element is formed from a material that has a modulus of elasticity of more than 5000 N/mm 2 .
  • the structural element contributes to increasing the rigidity of the implement in the first section.
  • the structural element is advantageously formed from a metal material.
  • the metal material is in particular a magnesium alloy.
  • the structural element can also be formed from a glass fiber reinforced, in particular a glass fiber reinforced, thermoplastic material.
  • a second stiffening unit is provided to increase the rigidity of the third section of the implement.
  • the second stiffening unit is arranged in the third section of the implement in the housing.
  • the housing can be designed with the same modulus of elasticity in the third section as in the second section.
  • the same material can be used for the housing in the second section and in the third section. This makes it easier to manufacture the housing of the working device.
  • the rigidity in the third section can be increased in a simple manner by the second stiffening unit.
  • the working device has a shaft.
  • the shank is expediently accommodated in the third section of the implement.
  • the shaft is accommodated in the housing.
  • the shaft is advantageously part of the second stiffening unit.
  • the rigidity of the third section of the working implement can be increased by means of the shank using a component that is already provided in the design of the working implement.
  • the shank is advantageously the shank of a pole pruner.
  • the shaft is formed by a guide tube.
  • the working device 1 shows a working device 1.
  • the working device 1 is designed as a pole pruner.
  • the working device is any other portable working device.
  • the working device can also be a motor chain saw or a rock cutter.
  • the implement 1 is portable.
  • the implement 1 is hand-held.
  • the working device 1 has a guide tube 7 .
  • the guide tube 7 has a first end 21.
  • the guide tube 7 has a second end 22.
  • the guide tube 7 carries a tool 9 at the second end 22.
  • the tool 9 is a saw chain.
  • this can also be any other type of tool.
  • the tool can also be a saw blade.
  • the tool 9 is driven by an in 1 not shown drive motor 5 driven.
  • the drive motor 5 is arranged in a housing 2 .
  • the housing 2 has a rear end 2.
  • the housing 2 has a front end 4.
  • the rear end 3 of the housing 2 faces the guide tube 7 .
  • the front end 4 of the housing 2 faces away from the guide tube 7 .
  • the housing 2 has a longitudinal axis 10.
  • the housing 2 extends along the longitudinal axis 10 from the rear end 3 to the front end 4.
  • the tool 9 is arranged at the front end 4 of the housing 2.
  • the inside 1 drive motor 5 not shown in detail is arranged in the housing 2 between the rear end 3 and the front end 4 .
  • the drive motor 5 is an electric motor.
  • the drive motor can also be an internal combustion engine.
  • the electric motor can be a direct current motor in the form of a commutator motor.
  • the electric motor can also be an EC motor.
  • the EC motor can be, for example, a universal motor, a brushless DC motor or an electronically commutated DC motor.
  • the rear end 3 of the housing 2 is supported on the guide tube 7 .
  • the second end 22 of the guide tube 7 is inserted into the housing 2 .
  • a receiving housing 23 is held at the first end 21 of the guide tube 7 .
  • a rechargeable battery is arranged in the receiving housing 23 .
  • Another type of energy source can also be arranged. Provision can also be made to use a stationary supply network as the energy source. Which is connected via an electrical line to the receiving housing, in particular to control electronics accommodated therein.
  • the first end 21 of the guide tube 7 is inserted into the receiving housing 23 .
  • the receiving housing 23 is attached to the first end 21 of the guide tube 7 .
  • an operating handle 8 is provided in the area of the first end 21 of the guide tube 7 .
  • the operating handle 8 has operating elements.
  • the operating elements are an operating lever 17 and a locking lever 18 intended.
  • the operating lever 17 is used to control the drive motor 5.
  • the operating lever 17 is also referred to as the throttle lever.
  • the locking lever 18 serves to secure the operating lever 17.
  • the rechargeable battery is electrically connected to the drive motor 5 via a power line (not shown).
  • the energy line runs inside the guide tube 7.
  • the guide tube 7 shown in the figures can be telescopic.
  • the guide tube has an upper tube section 19 and a lower tube section 20 .
  • the upper tube section 19 has the second end 22 of the guide tube 7.
  • the lower tube section 20 has the first end 21 of the guide tube 7.
  • the upper tube section 19 is connected to the lower tube section 20 via a plug connection.
  • the plug-in connection is realized by a clamping device 24 .
  • the clamping device 24 is preferably held on the lower pipe section 20 .
  • the clamping device 24 has a plug-in receptacle.
  • the upper tube section 19 is inserted into the socket.
  • the upper tube section is clamped in the clamping device 24 by means of a clamping mechanism.
  • the upper pipe section 20 can be fixed to the lower pipe section 19 or separated from it by the clamping mechanism of the clamping device 24 .
  • control electronics 25 are arranged at the first end 21 of the guide tube 7 .
  • the control electronics are arranged in the receiving housing 23 .
  • the drive motor 5 is arranged at the second end of the guide tube 7 .
  • the drive motor 5 is arranged in the housing 2 .
  • the drive motor 5 is electrically connected to the control electronics 25 via a power line (not shown).
  • the control electronics 25 controls the operation of the drive motor 5 via the power line.
  • the drive motor 5 drives the tool 9.
  • the tool 9 designed as a saw chain is arranged on a guide rail 26 .
  • the saw chain runs around the guide bar 26 during operation.
  • the drive motor 5 drives the tool 9 to revolve around the guide rail 26 .
  • the guide rail 26 shows a section of the implement 1 in an enlarged view.
  • the side view after 2 shows the housing 2 viewed perpendicularly to the longitudinal axis 10 of the housing 2.
  • the guide rail 26 protrudes beyond the front end 4 of the housing 2 in the direction of the longitudinal axis 10 of the housing 2.
  • the guide rail 26 has a longitudinal center axis 30. From the synopsis of Figures 2 and 3 It can be seen that the longitudinal center axis 30 of the guide rail 26 runs parallel to the longitudinal axis 10 of the housing 2 . 3 shows a top view of the detail of the illustration 2 .
  • the guide rail 26 is offset from the longitudinal axis 10 of the housing 2 .
  • the longitudinal center axis 30 of the guide rail 26 is an axis of symmetry of the guide rail 26.
  • the guide tube 7 has a longitudinal axis 50.
  • the longitudinal axis 50 of the guide tube 7 runs parallel, in the exemplary embodiment coaxially, to the longitudinal axis 10 of the housing 2.
  • the longitudinal axis 50 of the guide tube 7 runs parallel to the longitudinal center axis 30 of the guide rail 26.
  • the housing 2 has an overall length l.
  • the overall length l is measured in the direction of the longitudinal axis 10 of the housing 2 .
  • the size of the total length l corresponds to the distance between the rear end 3 of the housing 2 and the front end 4 of the housing 2.
  • the distance between the rear end 3 and the front end 4 is measured in the direction of the longitudinal axis 10 of the housing 2.
  • the overall length l extends from the rear end 3 of the housing 2 to the front end 4 of the housing 2.
  • the tool 1 has a first section 11 of the tool 1 , a second section 12 of the tool 1 and a third section 13 of the tool 1 along the longitudinal axis 10 of the housing 2 .
  • the first section 11, the second section 12 and the third section 13 follow one another.
  • the first section 11, the second section 12 and the third section 13 extend along the longitudinal axis 10 of the housing.
  • the first section 11 of the implement 1 extends from the front end 4 of the housing 2 to the second section 12 of the implement 1.
  • the second section 12 of the implement 1 extends from the first section 11 of the implement 1 to the third section 13 of the implement 1.
  • the third section 13 of the implement 1 extends from the second section 12 of the implement 1 to the rear end 3 of the housing 2.
  • the second section 12 of the implement 1 is located between the first section 11 and the third with respect to the direction of the longitudinal axis 10 of the housing 2 Section 13.
  • the first section 11 of the implement 1 is directly adjacent to the second section 12 of the implement 1 .
  • the second section 12 of the implement 1 is directly adjacent to the third section 13 of the implement 1 .
  • the second section 12 of the implement 1 has increased elasticity compared to the first section 11 of the implement 1 and the third section 13 of the implement 1 .
  • the second section 12 has increased resilience compared to the first section 11 and compared to the third section 13 .
  • the rigidity of the first section 11 of the working device 1 and the rigidity of the third section 13 of the working device 1 are each greater than the rigidity of the second section 12 of the working device 1.
  • the second section 12 of the working device 1 connects the first section 11 of the working device 1 to the third section of the implement 1.
  • the first section 11 of the implement 1, the second section 12 of the implement 1 and the third section 13 of the implement 1 form a unit.
  • the second section 12 of the implement 1 couples the first section 11 of the implement 1 to the third section 13 of the implement 1.
  • the second section 12 of the implement 1 couples the first section 11 of the implement 1 to the third section of the implement 1 acting as a spring element.
  • the second section 12 of the implement 1 enables a relative movement of the first section 11 of the implement 1 with respect to the third section 13 of the implement 1.
  • the second section 12 enables a relative movement with respect to a direction transverse to the longitudinal axis 10 of the housing 2 of the first section 11 of the implement 1 and the third section 13 of the implement 1 to each other.
  • the first section 11 of the implement 1 has a first length a.
  • the first length a is measured in the direction of the longitudinal axis 10 of the housing 2 .
  • the first length a corresponds to the distance, measured in the direction of the longitudinal axis 10 of the housing 2, between the front end 4 of the housing and the second section 12 of the implement 1.
  • the second section 12 of the implement 1 has a second length b.
  • the second length b is measured in the direction of the longitudinal axis 10 of the housing 2 .
  • the size of the second length b corresponds to the distance, measured in the direction of the longitudinal axis 10 of the housing, between the first section 11 of the implement 1 and the third section 13 of the implement 1.
  • the third section 13 of the implement 1 has a third length c.
  • the third length c is measured in the direction of the longitudinal axis 10 of the housing 2 .
  • the size of the second length b corresponds to the distance, measured in the direction of the longitudinal axis 10 of the housing 2, between the second section 12 of the implement 1 and the rear end 3 of the housing 2.
  • the front end 4 of the housing 2 is the end of the housing with respect to the direction of the longitudinal axis 10 of the housing 2.
  • the rear end 3 of the housing 2 is the end of the housing 2 with respect to the direction of the longitudinal axis 10 of the housing 2.
  • the rear end 3 of the The housing 2 lies in a plane perpendicular to the longitudinal axis 10 of the housing 2.
  • the front end 4 of the housing 2 lies in a plane perpendicular to the longitudinal axis 10 of the housing 2.
  • the second length b of the second section 12 of the implement 1 is at least 10% of the total length l of the housing 2.
  • the second length b of the second section 12 of the implement 1 is preferably at least 15% of the total length l of the housing 2.
  • the second length is b of the second section 12 of the implement 1 in about 20% of the total length l of the housing 2.
  • the second length b of the second section 12 of the implement 1 is at most 50% of the total length l of the housing 2. In the exemplary embodiment, the second length b of the second section 12 of the implement 1 is at most 35% of the total length l of the housing 2. In particular, the second Length b of the second section 12 of the implement 1 is at most 25% of the total length l of the housing 2.
  • the first length a of the first section 11 of the implement 1 is greater than the second length b of the second section of the implement 1.
  • the third length c of the third section 13 of the implement 1 is greater than the second length b of the second section 12 of the implement 1
  • the first length a is at least twice as large as the second length b.
  • the first length a is at least twice as large as the third length c.
  • the first length a is at least three times, in particular at least four times, as large as the second length b.
  • the third length c is at least twice as large as the second length b.
  • the second length b is in particular from 15% to 25% of the total length l of the housing 2.
  • a spring element is formed by the housing 2, which resiliently couples the first section 11 and the third section 13 to one another.
  • the first section 11, the second section 12 and the third section 13 of the implement 1 divide the housing 2 of the implement 1 into corresponding sections. In the area of the first section 11, the second section 12 and the third section 13, only a single housing, namely the housing 2, is arranged.
  • the first section 11 of the implement 1 and the third section 13 of the implement 1 are connected to one another in a resilient manner exclusively via the part of the housing 2 arranged in the second section 12 of the implement 1 .
  • the resilient coupling of the first section 11 of the implement 1 and the third section 13 of the implement 1 takes place exclusively through the part of the housing 2 in the second section 12 of the implement 1. No spring and also no joint is provided for coupling the first section of the implement 1 to the third section of the implement 1.
  • the housing 2 is formed from a thermoplastic material along its longitudinal axis 10 at least in the region of the second section 12 of the implement 1 .
  • the housing is formed entirely from a thermoplastic material.
  • the housing consists of the thermoplastic material only in the second section of the implement 1 .
  • the thermoplastic is an unreinforced plastic.
  • the plastic is free of fibers or balls.
  • the plastic is not reinforced by fibers or balls.
  • the term "unreinforced" includes plastics with a proportion of glass fibers and balls of less than 5%.
  • Such a thermoplastic is also referred to as a homogeneous thermoplastic.
  • the modulus of elasticity of the thermoplastic is at most 5000 N/mm 2 .
  • the modulus of elasticity of the thermoplastic is at most 3000 N/mm 2 .
  • the thermoplastic is an ABS (acrylonitrile butadiene styrene) plastic.
  • the thermoplastic is an ABS (acrylonitrile butadiene styrene)/PA (polyamide) plastic.
  • An ABS/PA plastic consists of a mixture of an ABS plastic with a PA plastic. It can also be provided that the thermoplastic is a PA6 plastic.
  • a PA6 plastic is a type 6 PA plastic.
  • the housing 2 consists of an 3 marked base body 45 and a housing member 44 formed.
  • the housing element 44 is arranged on the upper side 28 of the housing 2 .
  • the base body 45 is made of ABS/PA plastic.
  • the case member 44 is formed of ABS plastic.
  • the housing element 44 is arranged in the second section 12 of the implement. As a result, the elasticity of the implement 1 in the second section 12 is slightly increased.
  • the rigidity of the housing 2 itself is similar over the entire length l of the housing 2. Nevertheless, the rigidity of the implement 1 in the first section 11 and in the third section 13 of the implement 1 is significantly greater than the rigidity of the implement 1 in the second section 12. This is achieved by stiffening the housing 2 in the first section 11 and in the third section 13 of the Implement 1 reached.
  • a first stiffening unit 14 is arranged in the first section 11 .
  • the first stiffening unit 14 serves to increase the rigidity of the first section 11 of the working device 1 .
  • the first stiffening unit 14 is arranged in the housing 2 of the working device 1 .
  • the first stiffening unit 14 is at least partially made of a material with a modulus of elasticity that is very much greater than the modulus of elasticity of the material of the housing 2 .
  • the modulus of elasticity of the at least one material of the first stiffening unit is at least 5000 N/mm 2 .
  • the modulus of elasticity of the at least one material of the first stiffening unit 14 is at least twice as large, in particular at least 10 times as large, in the exemplary embodiment at least 50 times as large as the modulus of elasticity of the thermoplastic of the housing 2 in the second section 12 of the implement 1.
  • the first Stiffening unit 14 consists exclusively of materials whose modulus of elasticity is at least twice as large as the modulus of elasticity of the thermoplastic material of the housing 2 in the second section 12 of the implement 1.
  • the first stiffening unit consists exclusively of materials whose modulus of elasticity is at least 10 times as great large, in particular at least 50 times as large as the modulus of elasticity of the thermoplastic material of the housing 2 in the second section 12 of the implement 1.
  • the first stiffening unit 14 includes at least one component that is usually built into the construction of a portable working device.
  • the component contributes to the reinforcement of the housing 2 in the first section 11 of the implement 1 .
  • the component comprises a material with a modulus of elasticity that is at least twice as large, in particular 10 times as large, in the exemplary embodiment at least 50 times as large as the modulus of elasticity of the thermoplastic of the housing 2 in the second section 12 of the implement 1.
  • the drive motor 5 shown is part of the first stiffening unit 14.
  • the drive motor 5 has a motor housing.
  • the motor housing has a modulus of elasticity that is at least twice as large, in particular at least 10 times as large, in the exemplary embodiment at least 50 times as large as the modulus of elasticity of the thermoplastic material of the housing 2.
  • the motor housing is made of metal.
  • the drive motor 5 extends at least partially, in the exemplary embodiment completely with its longitudinal direction in the longitudinal direction of the housing 2.
  • the drive motor 5 has an axis of rotation 6. In the exemplary embodiment, the axis of rotation 6 runs coaxially with the longitudinal axis 10 of the housing 2.
  • the axis of rotation 6 of the drive motor 5 runs coaxially to the longitudinal axis 50 of the guide tube 7.
  • the drive motor 5 is designed as an internal rotor.
  • the drive motor 5 has a peripheral surface 27 .
  • the peripheral surface 27 runs around the axis of rotation 6 .
  • the circumferential surface 27 has a circumferential distance u from the inside of the housing 2 measured perpendicular to the axis of rotation 6 of the drive motor 5 .
  • the circumferential distance u is the smallest distance between the circumferential surface 27 and the housing 2 with respect to the direction radially to the axis of rotation 6.
  • the drive motor 5 is not in direct contact with the housing 2. As a result, the drive motor 5 can be well cooled and does not give off its heat directly to the housing 2 .
  • the peripheral surface 27 is connected to the housing 2 exclusively via components of the drive motor 5 .
  • An uninterrupted gap is formed between the housing 2 and the peripheral surface 27 .
  • the peripheral surface 27 can be completely surrounded by cooling air through the gap.
  • the circumferential surface 27 essentially has the shape of a lateral surface of a cylinder
  • the housing 2 has an upper side 28.
  • the upper side 28 of the housing 2 is the side of the housing 2 on which the saw chain runs away from the housing 2 when the working device 1 is in operation.
  • the top 28 extends transversely to the plane of the guide rail 26 of the implement 1.
  • the circumferential surface 27 of the drive motor 5 has the circumferential distance u in the direction from the axis of rotation 6 towards the top 28 of the implement 1.
  • the circumferential distance u is arranged at a different point. Provision can also be made for the circumferential surface 27 to be arranged at a constant circumferential distance u from the inside of the housing 2 over more than 50%, in particular more than 70% of its circumference.
  • the housing 2 has an overall height h.
  • the total height h is measured in the direction perpendicular to the longitudinal axis 10 of the housing 2 in the direction from the longitudinal axis 10 to the upper side 28 of the housing 2 .
  • the total height h is measured in the direction of the circumferential distance u.
  • the circumferential distance u is from 0.5% to 20%, in particular from 1% to 10%, in the exemplary embodiment from 2% to 9% of the total height h.
  • the circumferential distance u is at least 0.5%, in particular at least 1% of the total height h.
  • the circumferential distance u is at most 10% of the total height h.
  • the circumferential distance u is at least 0.1 mm, in the exemplary embodiment at least 0.25 mm.
  • the circumferential distance u is at most 2 mm.
  • the circumferential distance u is in particular at most 1 mm, in the exemplary embodiment at most 0.75 mm.
  • the circumferential distance u is approximately 0.5 mm.
  • the peripheral surface 27 of the drive motor 5 does not touch the housing 2 . However, it can also be provided that the housing 2 bears against the peripheral surface 27 .
  • the circumferential distance u corresponds to an adjustment path between the inside of the housing 2 and the circumferential surface 27 of the drive motor 5. When a force is applied to the housing 2, it can move in the first section 11 with respect to the longitudinal axis 10 of the housing 2 in the area of the drive motor 5 initially deform with great elasticity.
  • the inside of the housing 2 approaches the peripheral surface 27 of the drive motor 5 until it finally has contact with the peripheral surface 27 . From this moment on, the rigidity of the housing 2 and the rigidity of the implement 1 in the first section 11 are significantly increased.
  • the motor housing of the drive motor 5 ensures this increase in rigidity.
  • a vertical direction 40 runs from the axis of rotation 6 to the top side 28 of the housing 2. If, with the first section 11 of the working device 1 held in place, a force F is applied in the direction opposite to the vertical direction 40 on the third section 13 of the Working implement 1 acts, the position of the longitudinal axis 50 of the guide tube 7 changes relative to the position of the axis of rotation 6 of the drive motor 5. As an example, the new position of the longitudinal axis 50 when the force F is applied is identified by the reference symbol 50' in 4 drawn. The longitudinal axis 50 ′ is now no longer arranged coaxially with the axis of rotation 6 .
  • the direction vectors associated with the longitudinal axis 50' and the axis of rotation 6 are oriented at an angle ⁇ to one another.
  • the angle ⁇ is measured starting from the axis of rotation 6 of the drive motor 5 in the vertical direction 40 .
  • the inside of the housing 2 contacts the peripheral surface 27 of the drive motor 5 after the angle ⁇ has reached a maximum size of 1° to 10°, in particular 1° to 3°. After the angle ⁇ has reached a maximum value of 1° to 10°, in particular 1° to 3°, the rigidity of the housing 2 with respect to the direction of the axis of rotation 6 of the drive motor 5 in the area of the drive motor 5 is increased.
  • the specified angle ranges also apply to a force acting on the third section 13 of the implement 1 with a vector component in any other direction radially to the longitudinal axis 10 of the housing 2.
  • the inside of the housing 2 then comes into contact after the maximum value for the angle has been exceeded with the drive motor 5 and the rigidity of the first section 11 of the working device 1 is increased.
  • the specified angular ranges also apply in an analogous manner when a force is applied to the first section 11 of the implement while the third section 13 of the implement 1 is held in place.
  • the implement 1 has a structural element 16 .
  • the structural element 16 is arranged in the first section 11 of the implement 1 .
  • the structural element 16 holds the drive motor 5 in the housing 2.
  • the structural element 16 is assigned to the first stiffening unit 14.
  • the structural element 16 is part of the first stiffening unit 14.
  • the structural element 16 is formed from a material that has a modulus of elasticity of more than 5000 N/mm 2 . It can also be provided that the modulus of elasticity of the material of the structural element is at least twice as large, in particular at least 10 times as large as the modulus of elasticity of the thermoplastic material in the second section 12 of the implement 1.
  • the structural element 16 is formed from a metal material. In the exemplary embodiment, the structural element 16 is formed from a magnesium alloy. It can also be provided that the structural element 16 is formed from a glass fiber reinforced plastic.
  • the structural element 16 is attached to the housing 2 .
  • the structural element 16 is attached to the inside of the housing 2 .
  • the structural element 16 is attached to the housing 2 by means of an attachment means 29 .
  • the fastening means 29 consists of screws and corresponding holes in the structural element 16 and the housing 2. It can also be provided that the structural element 16 is formed integrally with the housing 2.
  • the structural element 16 increases the rigidity of the first section 11 of the implement 1.
  • the structural element 16 stiffens the housing 2 in the first section 11 of the implement 1.
  • the structural element 16 has a distance, measured in the vertical direction 40, from the inside of the upper side 28 of the housing 2.
  • the rigidity of the first section 11 of the implement 1 is further increased when loaded by the action of a force with a vector component opposite to the vertical direction 40 .
  • the structural element 16 increases the rigidity of the housing 2 in the first section 11 of the implement 1 from the start of the load due to its contact with the outer sides of the housing 2 adjoining the top 28.
  • the drive motor 5 is attached to the structural element 16 .
  • the drive motor 5 is held solely by the structural element 16 .
  • the structural element 16 is arranged between the drive motor 5 and the front end 4 of the housing 2 with respect to the direction of the longitudinal axis 10 of the housing 2 .
  • the structural element 16 is also referred to as a support plate, in particular as a support plate for the drive motor 5 .
  • Structural element 16 holds an in 4 gear 36, not shown in detail, which is arranged between the drive motor 5 and the tool 9.
  • the implement 1 includes a second stiffening unit 15.
  • the second stiffening unit 15 serves to increase the rigidity of the third section 13 of the working implement 1.
  • the second stiffening unit 15 is arranged in the third section 13 of the working implement 1.
  • the second stiffening unit 15 is arranged in the housing 2 .
  • the first stiffening unit 14 includes at least one component that is usually built into the construction of a portable working device.
  • the component contributes to the reinforcement of the housing 2 in the third section 13 of the implement 1 .
  • the component comprises a material with a modulus of elasticity that is at least twice as large, in particular 10 times as large, in the exemplary embodiment at least 50 times as large as the modulus of elasticity of the thermoplastic of the housing 2 in the second section 12 of the implement 1.
  • the second stiffening unit 15 is formed exclusively from materials that have a modulus of elasticity of more than 5000 N/mm 2 .
  • the working device 1 comprises a shaft.
  • the shank is part of the second stiffening unit 15.
  • the shank is accommodated in the third section 13 of the implement 1.
  • the shank is accommodated in the housing 2 of the working device 1 .
  • the shank serves to guide the working device 1.
  • the shank is a shank of the guide tube 7.
  • the shank is made of metal.
  • the modulus of elasticity of the material of the shaft is at least twice, in particular 10 times, in the exemplary embodiment 50 times the modulus of elasticity of the thermoplastic of the housing 2.
  • the guide tube 7 rests at least partially on the inside of the housing 2 . In this way, the guide tube 7 stiffens the housing 2 in the third section 13 of the implement 1.
  • the shank has an end face 31 .
  • the end face 31 faces the housing 2 .
  • the shank is inserted into the housing 2 with an end face 31 .
  • a recess 32 is provided in the end face 31 of the shank.
  • a holding element 33 is introduced into the depression 32 .
  • the holding element 33 is formed from a material that has a modulus of elasticity of more than 5000 N/mm 2 .
  • the holding element 33 is fastened to the housing 2 by fastening means 34 .
  • the holding element 33 is inserted into the depression 32 .
  • the holding element 33 is fastened to the shaft by means of the fastening means 34 . In this way the shank is held in the housing.
  • the holding member 33 is fixed to the inside of the housing 2 .
  • the holding element 33 stiffens the housing 2 in the third section 13 of the implement 1.
  • the holding element 33 rests at least partially on the inside of the housing 2.
  • the peripheral surface 27 of the drive motor 5 is delimited in the direction of the axis of rotation 6 of the drive motor 5 in the direction of the rear end 3 of the housing 2 by an end face 35 .
  • the second section 12 of the implement 1 extends in the direction of the longitudinal axis 10 of the housing 2 from the end face 35 of the peripheral surface 27 of the drive motor 5 to the end face 31 of the shaft.
  • no separate component of the implement 1 arranged in the housing 2 contributes to the reinforcement of the housing 2 in the second section 12, even when a large force F acts on the third section 13 with the first section 11 held in place.
  • the rigidity of the implement 1 is second Section 12 is determined solely by the rigidity of the housing 2 in the second section 12 of the implement 1 alone.
  • the rigidity is determined solely by the rigidity of the housing 2 for values of the angle ⁇ from 0° to 10°, in particular from 0° to 30°, in the exemplary embodiment in the second section 12 of the implement 1 for values from 0° to 50°.
  • the first section 11 of the implement 1 extends with respect to the direction of the longitudinal axis 10 of the housing 2 from the front end 4 of the housing 2 to the end face 35 of the peripheral surface 27 of the drive motor 5.
  • the third section 13 of the Working device 1 extends with respect to the longitudinal axis 10 of the housing 2 from the end face 31 of the shaft to the rear end 3 of the housing 2.
  • FIG 5 is again shown that the longitudinal center axis 30 of the guide rail 26 offset to the axis of rotation 6 of the drive motor 5 runs.
  • the torque of the drive motor 5 is transmitted to the tool 9 via the gear 36 .
  • the gear 36 includes a pinion gear.
  • the drive pinion rotates about the pinion axis 37.
  • the pinion axis 37 runs perpendicular to the plane of the guide rail 26.
  • the pinion axis 37 runs perpendicular to the axis of rotation 6.
  • the pinion axis 37 runs perpendicular to the longitudinal central axis 30.
  • a drive pinion 38 belonging to the pinion axis 37 is in 6 shown. During operation, the drive pinion 38 rotates about the pinion axis 37 and drives the tool 9 .
  • Fastening means 29 comprises at least one screw 43.
  • An oil system 39 is arranged on the structural element. It can also be provided that the oil system 39 is part of the first stiffening unit 14 .
  • FIG. 7 shows the drive motor 5 and the structural element 16 in a side view.
  • Part of the fastening means 29 is at least one hole 42 in the structural element 16.
  • the hole 42 cooperates with the screw 43 for fastening the structural element 16 to the housing 2.
  • three attachment points of the attachment means 29 are provided.
  • a screw 43 and a hole 42 are provided at each attachment point.
  • the drive motor 5 is fastened to the structural element 16 by means of a fastening element 41 .
  • the drive motor 5 and the structural element 16 form the first stiffening unit 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Motor Or Generator Frames (AREA)
EP22157839.6A 2022-02-21 2022-02-21 Appareil de travail portatif Withdrawn EP4230355A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22157839.6A EP4230355A1 (fr) 2022-02-21 2022-02-21 Appareil de travail portatif

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22157839.6A EP4230355A1 (fr) 2022-02-21 2022-02-21 Appareil de travail portatif

Publications (1)

Publication Number Publication Date
EP4230355A1 true EP4230355A1 (fr) 2023-08-23

Family

ID=80447100

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22157839.6A Withdrawn EP4230355A1 (fr) 2022-02-21 2022-02-21 Appareil de travail portatif

Country Status (1)

Country Link
EP (1) EP4230355A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0641099B2 (ja) * 1985-09-27 1994-06-01 日立工機株式会社 手持ち動力工具の防振装置
US20060113098A1 (en) * 2004-10-29 2006-06-01 Hiroto Inagawa Power tool
DE102006027785A1 (de) * 2006-06-16 2007-12-20 Robert Bosch Gmbh Handwerkzeugmaschine
US20110011608A1 (en) * 2005-10-04 2011-01-20 Dietmar Saur Power tool

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0641099B2 (ja) * 1985-09-27 1994-06-01 日立工機株式会社 手持ち動力工具の防振装置
US20060113098A1 (en) * 2004-10-29 2006-06-01 Hiroto Inagawa Power tool
US20110011608A1 (en) * 2005-10-04 2011-01-20 Dietmar Saur Power tool
DE102006027785A1 (de) * 2006-06-16 2007-12-20 Robert Bosch Gmbh Handwerkzeugmaschine

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