EP4324597A1 - Marteau perforateur ou burineur avec une unité de percussion à vibrations réduites - Google Patents

Marteau perforateur ou burineur avec une unité de percussion à vibrations réduites Download PDF

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Publication number
EP4324597A1
EP4324597A1 EP22190886.6A EP22190886A EP4324597A1 EP 4324597 A1 EP4324597 A1 EP 4324597A1 EP 22190886 A EP22190886 A EP 22190886A EP 4324597 A1 EP4324597 A1 EP 4324597A1
Authority
EP
European Patent Office
Prior art keywords
drill
impact mechanism
axis
drive motor
eccentric gear
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.)
Pending
Application number
EP22190886.6A
Other languages
German (de)
English (en)
Inventor
Uto Plank
Josef Fünfer
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Priority to EP22190886.6A priority Critical patent/EP4324597A1/fr
Priority to PCT/EP2023/071490 priority patent/WO2024037881A1/fr
Publication of EP4324597A1 publication Critical patent/EP4324597A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/12—Means for driving the impulse member comprising a crank mechanism
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/003—Crossed drill and motor spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/245—Spatial arrangement of components of the tool relative to each other

Definitions

  • the present invention relates to a drill or chisel hammer with a percussion unit, comprising a drive motor with a motor axis arranged transversely to a percussion axis for generating a rotary drive movement, which a subsequent eccentric gear converts into a linearly alternating working movement along the percussion axis, which via a percussion connected thereto can be transferred to a coaxially adjacent tool, with the center of gravity of the drive motor being arranged at a radial distance from the impact mechanism axis and the center of gravity of the eccentric gear at an opposite radial distance from the impact mechanism axis to reduce vibration.
  • the field of application of the invention extends primarily to hand-held drilling or chiseling hammers, which are primarily equipped with an electric motor drive.
  • Such hand-held electric power tools use a mechanical percussion unit to generate a linearly alternating working movement, i.e. a back and forth movement to act on the tool, which in the case of a chisel hammer is used as a chisel and in the case of a hammer drill as an impact drill for processing preferably mineral materials - such as stone, concrete and the like - is trained.
  • an electric hand-held machine tool that drives a tool Due to the interaction with the workpiece and the operator's hand-arm system as well as the internal mass and rigidity distribution, an electric hand-held machine tool that drives a tool has a complex self-excitation, the resulting self-vibration of which, especially in the handle area, must be largely suppressed.
  • the technical effort involved in passively damping or actively controlled vibration suppression increases with the complexity of the self-excitation to be compensated.
  • the impact unit In order to ensure the most controlled and fatigue-free handling of such hand-held electric power tools, the impact unit should have as little vibration as possible.
  • the invention includes the technical teaching that the radial distance of the drive motor and the radial distance of the eccentric gear of the percussion unit to the percussion axis is dimensioned in such a way that a balanced mass distribution is achieved with respect to the percussion axis. This means that the relative distance of the respective structural components is selected according to their mass, so that the overall center of gravity of the percussion unit lies on the percussion axis.
  • the advantage of the solution according to the invention is, in particular, that a balanced mass distribution with respect to the impact mechanism axis can be achieved solely through an optimized adjustment of the said radial distances. Since there is no acceleration of the percussion unit in the transverse direction, minimal vibration is achieved.
  • the drive motor viewed along the impact mechanism axis, is arranged completely behind an eccentric unit of the eccentric gear.
  • the drive motor's own mass no longer plays a limiting role, as it can be freely positioned in the transverse direction in order to create the desired mass balance compared to the normally lighter eccentric gear.
  • the eccentric gear does not stand in the way of positioning the drive motor in the transverse direction and vibration reduction can also be achieved using this design with relatively heavier drive motors.
  • the drive motor with the exception of the motor shaft, completely radially offset next to the eccentric unit of the eccentric gear when viewed along the impact mechanism axis.
  • This design is suitable for impact units that need to be as short as possible. Since in this case there is little scope for varying the radial distance of the drive motor from the impact mechanism axis, this variant is particularly suitable for relatively light drive motors. In this case, however, a further influence on the balanced mass distribution can also be exerted via the eccentric gear.
  • the transmission gear of the eccentric gear could be designed to be rather heavy for the purpose of mass balancing.
  • this design enables a transmission gear with relatively small gears, since the center distance to be bridged is smaller than in the design described above, so that in particular the overall width of the hand-held electric power tool is reduced.
  • the optimum depends on the design goals and the influencing parameters discussed above.
  • the radial distance between the center of gravity of the motor and the axis of the percussion mechanism is smaller than the radial distance between the center of gravity of the eccentric gear and the axis of the percussion mechanism.
  • the drive motor is preferably designed as an electric motor and its mass essentially depends on the performance class.
  • the weight can be influenced by using brushless electric motors, which are usually relatively lighter in the same performance class.
  • a single-stage transmission gear is preferably used to translate into slow speed, which is completely is preferably designed as a spur gear stage.
  • the distal end of the motor shaft is designed as a toothed pinion with preferably more than ten teeth.
  • the diameter of the corresponding spur gear of the transmission gear depends on the center distance between the motor axis and the main eccentric gear axis and is essentially dependent on the stroke of the eccentric connecting rod and the motor diameter. As already mentioned, however, this only applies if the first-mentioned design of a striking mechanism unit is implemented.
  • the spur gear of the transmission gear can be made of a heavy steel material or a light plastic material. Since the spur gear is arranged on the outside in the radial direction, its own mass has a significant effect on the mass distribution in relation to the impact mechanism axis.
  • a percussion unit of a drill or chisel hammer according to the invention is designed such that in a target working position held by an operator, the drive motor has a smaller distance from the ground - i.e. the distance to the floor - than the eccentric gear. Since the drive motor protrudes further from the impact mechanism axis in the radial direction, this lower positioning is easier for the operator to handle than lateral or upper positioning.
  • a lower positioning of the drive motor causes the opposite eccentric gear to be arranged above the impact mechanism axis.
  • the entire percussion unit is surrounded by a device housing with a handle and has a tool holder for the chisel or impact drill on the distal end.
  • the percussion unit of a chisel hammer consists of a drive motor 1 with a motor axis A M arranged transversely to a percussion axis As to generate a rotary drive movement.
  • the drive motor 1 is designed as an electric motor and has a pinion toothing on the distal end of a motor shaft 2, which engages on a spur gear 3 of a single-stage transmission gear 4.
  • the single-stage transmission gear 4 is part of an eccentric gear 5 connected downstream of the drive motor 1.
  • the eccentric gear 5 has an eccentric wheel 6 connected downstream of the transmission gear 4 with a connecting rod 7 and an exciter piston 8 arranged on the impact mechanism side.
  • the exciter piston 8 is also part of a percussion mechanism 9, which transmits the working movement to a tool - not shown - which is arranged coaxially therewith.
  • the center of gravity S M of the drive motor 1 is arranged at a radial distance s M from the percussion axis As and the center of gravity S G of the eccentric gear 5 is arranged at an opposite radial distance s G from the percussion axis As.
  • the radial distance s M of the drive motor 1 and the radial distance s G of the eccentric gear 5 are dimensioned such that a balanced mass distribution is achieved with respect to the impact mechanism axis As.
  • the drive motor 1 is arranged completely behind the eccentric gear 5 as viewed along the percussion axis As.
  • the radial distance s M is smaller than the radial distance s G , so that a drive motor 1 of a relatively high mass can be positioned in a correspondingly balanced manner relative to the eccentric gear 5.
  • the drive motor 1 with the exception of the motor shaft 2, is arranged completely radially offset next to the eccentric gear 5 when viewed along the impact mechanism axis As.
  • the striking mechanism unit is more compact in comparison to the design described above, but the resulting larger radial distance s M compared to the other distance s G can be achieved on the one hand by an electric motor that is as light as possible and on the other hand by a particularly heavy spur gear 3 of the transmission gear 4 be balanced.
  • the more compact design is particularly evident in a relatively small center distance s A between the motor axle and the spur gear axle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
EP22190886.6A 2022-08-18 2022-08-18 Marteau perforateur ou burineur avec une unité de percussion à vibrations réduites Pending EP4324597A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22190886.6A EP4324597A1 (fr) 2022-08-18 2022-08-18 Marteau perforateur ou burineur avec une unité de percussion à vibrations réduites
PCT/EP2023/071490 WO2024037881A1 (fr) 2022-08-18 2023-08-03 Marteau perforateur ou marteau burineur doté d'une unité de mécanisme de marteau à vibrations réduites

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22190886.6A EP4324597A1 (fr) 2022-08-18 2022-08-18 Marteau perforateur ou burineur avec une unité de percussion à vibrations réduites

Publications (1)

Publication Number Publication Date
EP4324597A1 true EP4324597A1 (fr) 2024-02-21

Family

ID=82943289

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22190886.6A Pending EP4324597A1 (fr) 2022-08-18 2022-08-18 Marteau perforateur ou burineur avec une unité de percussion à vibrations réduites

Country Status (2)

Country Link
EP (1) EP4324597A1 (fr)
WO (1) WO2024037881A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1238759A1 (fr) * 2001-03-07 2002-09-11 Black & Decker Inc. Marteau
EP1431005A2 (fr) 2002-12-19 2004-06-23 HILTI Aktiengesellschaft Outil à main électrique à percussion

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1238759A1 (fr) * 2001-03-07 2002-09-11 Black & Decker Inc. Marteau
EP1431005A2 (fr) 2002-12-19 2004-06-23 HILTI Aktiengesellschaft Outil à main électrique à percussion

Also Published As

Publication number Publication date
WO2024037881A1 (fr) 2024-02-22

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