EP3456479A1 - Dispositif d'entraînement pour une machine-outil entraînée - Google Patents

Dispositif d'entraînement pour une machine-outil entraînée Download PDF

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Publication number
EP3456479A1
EP3456479A1 EP18191169.4A EP18191169A EP3456479A1 EP 3456479 A1 EP3456479 A1 EP 3456479A1 EP 18191169 A EP18191169 A EP 18191169A EP 3456479 A1 EP3456479 A1 EP 3456479A1
Authority
EP
European Patent Office
Prior art keywords
gear
drive spindle
drive
intermediate shaft
actuator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18191169.4A
Other languages
German (de)
English (en)
Other versions
EP3456479B1 (fr
Inventor
Roland Saupp
Michael Kukla
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.)
Metabowerke GmbH and Co
Original Assignee
Metabowerke GmbH and Co
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 Metabowerke GmbH and Co filed Critical Metabowerke GmbH and Co
Publication of EP3456479A1 publication Critical patent/EP3456479A1/fr
Application granted granted Critical
Publication of EP3456479B1 publication Critical patent/EP3456479B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/006—Mode changers; Mechanisms connected thereto
    • 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
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/061—Swash-plate actuated impulse-driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0015—Tools having a percussion-only mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0023—Tools having a percussion-and-rotation mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0038—Tools having a rotation-only mode

Definitions

  • the present invention relates to a gear assembly for a power tool with a rotating and / or impact driven tool.
  • a machine tool may in particular comprise a drilling or percussion drill or a hammer drill with or without chisel function.
  • one of a drive unit of the machine tool driven shaft protrudes with its front end in the gear assembly and drives a intermediate shaft via a drive pinion.
  • the German Offenlegungsschrift discloses DE 196 51 828 A1
  • the intermediate shaft is arranged parallel to the Bohrwerkmaschineachse, but at a distance next to this.
  • the hammer drill further comprises a Lucaspolster Kunststofftechnik and a reciprocating in the direction of Bohrwerkmaschinectionachse reciprocating wobble drive device whose swash bearing or swash plate is mounted on the rotatably driven intermediate shaft.
  • wobble drive device is understood to mean a rotation / translation converter device in which the rotational movement of a drive-side element is converted into a linear translational movement of an output-side element.
  • a rotation element acts on a wobble element which is referred to below as a wobble bearing in such a way that it is driven to tilt back and forth and can thereby displace a further element into linear translational motion.
  • a drive spindle of the machine tool on which the tool to be rotated can be accommodated, comprises a drill sleeve, which is in engagement with the external toothing of a spur gear of the intermediate shaft seated on the intermediate shaft with an external toothed ring.
  • the length of the gear assembly is thus significantly influenced by the length and the position of the impact mechanism. So it must be ensured that the swash bearing does not collide with the driven shaft and / or the spur gear of the intermediate shaft.
  • a hammer drill which has a drive motor with a motor shaft and a motor spindle connected to the motor shaft.
  • An impact mechanism which is also operatively connected to the motor shaft, is connected to the tool spindle via a single-stage gearbox.
  • the single-stage gearbox includes a Schlagtechnik drive wheel that drives the tool spindle via a ring gear.
  • the motor shaft of the drive motor in turn comprises a motor pinion whose teeth are in operative engagement with an end toothing of the striking mechanism drive wheel.
  • a machine tool comprising a drive spindle for the rotary drive of a tool, a coaxial gear ring which can be coupled to the drive spindle and an intermediate shaft which is capable of transmitting a drive torque from a driven shaft to the drive spindle.
  • the intermediate shaft has for this purpose a gear which is in engagement with the coaxial sprocket of the drive spindle.
  • a transmission arrangement provided, which additionally comprises a further countershaft with a gear.
  • the present invention proposes a gear arrangement with the features of claim 1.
  • the gear assembly includes a driven shaft, a drive spindle for rotationally driving an attached tool, the drive spindle having a coaxial sprocket, and an intermediate shaft capable of transmitting drive torque from the driven shaft to the drive spindle.
  • a countershaft with a coaxial gear and a rotationally fixed associated Taumeltriebvorraumiques provided, wherein the tumble drive device is capable of converting a rotational movement of the countershaft into a translational movement and to transmit to the drive spindle for the striking drive of the tool.
  • the intermediate shaft has a first gear, which is engageable with the coaxial ring gear of the drive spindle, and a second gear, which is engageable with the coaxial gear of the countershaft, wherein the first and second gear in the axial direction relative to the sliding Drive spindle and the countershaft are arranged.
  • the claimed feature, according to which the tool is detachably attachable to the machine tool not essential for the invention and thus not mandatory, ie the invention can also be implemented in a machine tool, in which the tool is not detachable, but is firmly attached to the machine tool.
  • the driven shaft is driven by a drive unit, such as an electric motor or a pneumatic drive unit, and transmits the drive torque in a conventional manner to the intermediate shaft of the gear assembly.
  • the drive spindle is used for the rotary drive of a tool which can be accommodated on the machine tool, wherein the intermediate shaft can be brought into engagement with the coaxial toothed ring of the drive spindle via a first gearwheel and, via this, is able to transmit the drive torque from the driven shaft to the drive spindle.
  • the torque can be transmitted to the countershaft via the second gear of the intermediate shaft, which is engageable with the coaxial gear of the countershaft, whereby the rotatably connected tumbling drive device is driven.
  • This can convert a rotational movement of the countershaft into a translational movement and to transmit this translational movement to the drive spindle for the striking drive of the tool.
  • Both the first and the second gear of the intermediate shaft are arranged in the axial direction (relative to the longitudinal axis of the intermediate shaft) relatively displaceable to the drive spindle and the countershaft.
  • the intermediate shaft comprises a sliding block which is slidably disposed on the intermediate shaft in the axial direction between at least two positions and having the first gear and the second gear.
  • the first gear and the second gear of the intermediate shaft are displaced axially relative to the intermediate shaft and displace as a result of this sliding movement accordingly also relative to the drive spindle and the countershaft.
  • the shift can be between two maximum positions, ie, released between at least two positions.
  • one or more intermediate position (s) can be selected between these maximum positions, as will be described in more detail later.
  • the gear assembly further comprises an actuator which is connectable to an actuating element of the machine tool and adapted to convert a switching movement of the actuating element in a shift of the sliding block in the connected state.
  • the two gears of the intermediate shaft are not only used for torque transmission, but also for switching between different operating modes of the machine tool.
  • a first mode in which the coaxial ring gear of the drive spindle is in engagement with the first gear of the intermediate shaft, and the second gear of the intermediate shaft is out of engagement with the coaxial gear of the countershaft describes a mode in which the drive spindle is only driven in rotation (purer drilling).
  • the first gear and the second gear of the intermediate shaft are respectively in engagement with the corresponding coaxial sprocket of the drive spindle and the coaxial gear of the countershaft.
  • the drive spindle is thus not only rotatingly separate also driven beating. This corresponds to the impact drilling operation of the machine tool.
  • the first gear of the intermediate shaft may be disengaged from the coaxial sprocket of the drive spindle while the second gear is in engagement with the co-axial gear of the countershaft. In this mode, therefore, no more torque is transmitted to the drive spindle but only a translation generated by the wobble drive device for the striking drive of the tool (chisel operation).
  • the actuating element may comprise, for example, a rotary knob, the rotational movement of which in a known manner causes a translational movement of the associated actuator, which in turn displaces the sliding block in the axial direction.
  • a rotary knob the rotational movement of which in a known manner causes a translational movement of the associated actuator, which in turn displaces the sliding block in the axial direction.
  • alternative embodiments for this purpose are also conceivable, such as an axially displaceable actuating element.
  • the actuator is firmly connected in the axial direction with the sliding block.
  • the actuator is further rotatably disposed within the gear assembly and in particular a toothed projection has, which can be brought in a switching position of the actuator in locking engagement with the coaxial sprocket of the drive spindle.
  • the toothed projection may have at least one or more teeth whose outer contour forms a counter contour to the contour of the toothed circle of the drive spindle. In this way, a reliable locking of the drive spindle is achieved via the engagement of the mating contour of the toothed attachment with the outer contour of the toothed circle of the drive spindle.
  • the actuator may in particular be arranged on the sliding block, that an intermediate position in which the projection of the actuator is not yet in engagement with the coaxial sprocket of the drive spindle and this rotatably fixed, but no more torque transmission from the intermediate shaft to the drive spindle takes place, since the first gear is already brought out of engagement with the coaxial sprocket of the drive spindle, be provided.
  • This intermediate position allows the setting of, for example, a flat chisel in its desired orientation.
  • the actuator for the rotationally fixed arrangement within the gear arrangement a first receiving area for receiving an end portion of the countershaft and a second receiving area for receiving having an end portion of the intermediate shaft.
  • the two receiving areas of the actuator bearing points and allow a rotationally fixed arrangement of the actuator within the gear assembly.
  • required components are used anyway, which in turn is space and weight saving.
  • the first receiving portion of the actuator comprises a circular recess whose inner diameter substantially corresponds to the outer diameter of the end portion of the countershaft.
  • the recess is designed in particular as a through hole to allow axial displacement of the actuator with respect to the intermediate shaft.
  • the second receiving portion of the actuator may comprise a laterally open circular recess whose inner diameter corresponds substantially to the outer diameter of the end portion of the intermediate shaft and the lateral opening less than 180 degrees, in particular less than 160 degrees, for example 150th Includes angle degree.
  • this laterally open circular recess may be designed as a through-hole to provide the axial displacement of the actuator in a simple manner.
  • the lateral opening ie, in that no circumferential inner peripheral surface is provided, a simplified assembly can be provided.
  • the male end portion can be inserted laterally through this opening.
  • a flattening may be provided on the male end portion.
  • a preferred orientation of the lateral opening in the installed state of the actuator ensure that a rotation of the actuator about the axis of rotation of the countershaft and thus prevents the bearing point formed by the first receiving portion of the actuator.
  • the lateral opening is oriented such that the end portion of the intermediate shaft is engaged behind in the mounted state of the actuator and thus counteracts such unwanted rotational movement.
  • the gear arrangement further comprises a Lucaspolsterschlagtechnik, which is connected to the drive spindle.
  • the air cushion impact mechanism may be partially formed integrally with the drive spindle or formed separately and be firmly connected in the mounted state with this.
  • Such an air cushion percussion device may comprise a percussion piston, an anvil and an exciter sleeve and a drill sleeve in the usual way, wherein the exciter sleeve can be slidably received within the drill sleeve and with this can form a space receiving the air cushion.
  • the driven shaft can, as already mentioned, be arranged at an angle, in particular at a right angle to the drive spindle.
  • a compact rotary hammer can be provided with an L-shaped housing with optimum housing space utilization.
  • the intermediate shaft has a rotatably connected therewith ring gear, which in meshing engagement with a pinion of the driven Wave stands. This allows a right angle arrangement of intermediate shaft and driven shaft.
  • the present invention also relates to a machine tool having a housing, in particular in an L-shaped construction, in which the housing may comprise at least a first housing part with a first longitudinal axis and a second housing with a second longitudinal axis, and wherein the first and second longitudinal axis are not arranged parallel to each other, and with a gear arrangement having one or more of the features described above.
  • the FIG. 1 shows a transmission assembly according to the invention, which is generally designated by the reference numeral 10.
  • the gear arrangement 10 comprises a driven shaft 12, which is driven by a drive unit designed as an electric motor M, a drive spindle 14 and an intermediate shaft 20 and a countershaft 30 designed as a wobble drive shaft.
  • the drive spindle 14 has its free end remote from the driven shaft 12 a tool holder (not shown) for receiving a tool, such as a drill or a chisel on.
  • the drive spindle 14 comprises a drill sleeve 18 which engages in sections thereof.
  • the drive spindle 14 extends in a longitudinal direction L, which coincides with a tool axis (Bohrwerkmaschinemaschinese).
  • Parallel to the drive spindle 14 extend the intermediate shaft 20 and the wobble drive shaft 30.
  • the respective axes of rotation are arranged parallel to the longitudinal direction L and not designated.
  • the intermediate shaft 20 is used in the present transmission assembly 10 for transmitting a drive torque from the driven shaft 12 to the drive spindle 14.
  • the intermediate shaft 20 has a ring gear 22 with a frontal toothing 22a, which is in engagement with an external toothing 12a of the driven shaft 12 ,
  • the drive torque of the electric motor M is transmitted via the external teeth 12a and the teeth 22a of the ring gear 22 to the intermediate shaft 20 (see also FIG. 3 ).
  • the intermediate shaft 20 further includes a switching block or sliding block 44 which engages positively in a splined toothing 46 on the outer circumference of the intermediate shaft 20 and thus slidably along the intermediate shaft 20, but rotatably mounted thereon. In this case, the direction of displacement of the sliding block 44 in the FIGS.
  • the sliding block 44 has a first ring gear 24 which engages with a ring gear 28 which is rotatably connected to the drive spindle 14. In this way, the drive torque is transmitted from the intermediate shaft 20 via the first ring gear 24 of the sliding block 44 to the ring gear 28 of the drive spindle 14.
  • the first ring gear 24 can be brought into or out of engagement with the ring gear 28 of the drive spindle 14 become.
  • the sliding block 44 further includes a second sprocket 42 which can be brought into engagement with a sprocket 26 of the wobble drive shaft 30 depending on the position of the sliding block 44.
  • the torque of the intermediate shaft 20 are not only used to drive the drive spindle 14 by this is transmitted to the ring gear 28 of the drive spindle 14 via the first ring gear 24, but also to drive the Taumeltriebwelle 30 by the torque is transmitted via the second ring gear 42 to the ring gear 26 of the wobble drive shaft 30.
  • a tumble drive device 32 On the wobble drive shaft 30, which extends parallel to the intermediate shaft 20 and is arranged at a predetermined distance from this (see also FIG. 2 ), a tumble drive device 32 is arranged.
  • This includes a wobble bearing 34 which is rotatably connected to the wobble drive shaft 30, and a connecting means 36 which is received in the manner of a ball joint in a corresponding receptacle 38a of a reciprocating piston or a exciter sleeve 38.
  • the wobble drive device 32 is used in a known manner to a rotational movement of the wobble drive shaft 30 in a translational movement T (see. FIG. 3 ) and possibly to transfer these via an air spring on the exciter sleeve 38.
  • the gear assembly 10 finally includes a striking mechanism 40, which may be formed, for example, as a Lucaspolster Kunststofftechnik and a percussion piston, an anvil, and the exciter sleeve 38 and a drill sleeve may include, the exciter sleeve 38 may be slidably received within the drill sleeve and with this one the air cushion can take up receiving space.
  • a striking mechanism 40 which may be formed, for example, as a Lucaspolster Farbwerk and a percussion piston, an anvil, and the exciter sleeve 38 and a drill sleeve may include, the exciter sleeve 38 may be slidably received within the drill sleeve and with this one the air cushion can take up receiving space.
  • the exciter sleeve 38 of the percussion piston is set in a reciprocating motion, which is transmitted via the striker (not shown) to a recorded in the tool holder of the drive spindle 14 tool. Consequently,
  • FIG. 3 shows in particular an operating position in which the sliding block 44 is shown in an operating position in which the first ring gear 24 is in engagement with the ring gear 28 of the drive spindle 14, while the second ring gear 42 is in rotationally fixed engagement with the ring gear 26 of the wobble drive shaft 30 ,
  • This operating position shows a beating drilling operation (hammer drilling position), in which the tool executes a rotational movement on the one hand and, secondly, in addition to the rotational movement, also experiences a striking movement (hammer drilling operation).
  • the sliding block 44 are also moved in the direction S to the left, so that the first ring gear 24 out of engagement with the ring gear 28 of the drive spindle 14 passes.
  • the second ring gear 42 remains in rotational engagement 26 with the wobble drive shaft 30, whereby the wobble drive device 32 is further driven and transmits a translational movement T to the drive spindle 14 (bit position).
  • a recorded on the tool holder tool thus undergoes only a purely beating motion, as no torque is transmitted to the drive spindle 14 via the ring gear 28 (hammer operation or chisel operation).
  • an actuator 50 designed as a shift fork 50 is additionally provided, which is displaceably mounted on the wobble drive shaft 30 at a first bearing point 52 (first receiving section of the actuator).
  • the shift fork 50 In order to avoid unwanted rotation of the drive spindle 14 in hammer operation or chisel operation, the shift fork 50 also has on its outer periphery (see also FIG. 4 ) has a toothed portion 54 which corresponds in its toothing with the external toothing of the ring gear 28. Thus, if the sliding block 44 is moved to the left for hammer operation or bit operation, the shift fork 50 can be brought into rotationally fixed engagement with the ring gear 28 of the drive spindle 14.
  • the shift fork 50 is slidably mounted on the intermediate shaft 20 in a second bearing point 56 (second receiving portion of the actuator), an undesirable pivotal movement of the shift fork 50 about the first bearing point 52 due to an undesirable rotational movement of the ring gear 28 is reliably prevented.
  • the second bearing point 56 is provided with a lateral opening 58 which includes less than 180 degrees of angle.
  • a control element 60 is further provided which is formed in the form of a rotary handle. If the user now rotates on the rotary handle 60, which is mounted on the outside of the machine tool housing (not shown) in the installed state and projects through it, the rotary movement of the rotary handle 60 is converted in a known manner via a positioning wire 62 into a translatory movement (operating movement B). the shift fork 50 and connected thereto the shift block 44 converted. For this purpose, the jumper wire 62 is connected in a known manner via holding structures 70, 72 with the shift fork 50 and stored at this.
EP18191169.4A 2017-09-19 2018-08-28 Dispositif d'entraînement pour une machine-outil motorisée Active EP3456479B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017121720.7A DE102017121720A1 (de) 2017-09-19 2017-09-19 Getriebeanordnung für eine angetriebene Werkzeugmaschine

Publications (2)

Publication Number Publication Date
EP3456479A1 true EP3456479A1 (fr) 2019-03-20
EP3456479B1 EP3456479B1 (fr) 2020-02-12

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EP18191169.4A Active EP3456479B1 (fr) 2017-09-19 2018-08-28 Dispositif d'entraînement pour une machine-outil motorisée

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EP (1) EP3456479B1 (fr)
DE (1) DE102017121720A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3812097A1 (fr) * 2019-10-21 2021-04-28 Makita Corporation Marteau rotatif
US11318596B2 (en) 2019-10-21 2022-05-03 Makita Corporation Power tool having hammer mechanism

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7360891B2 (ja) * 2019-10-21 2023-10-13 株式会社マキタ ハンマドリル

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1101570A2 (fr) * 1999-11-18 2001-05-23 HILTI Aktiengesellschaft Appareil de forage et de percussion
EP2700477A1 (fr) * 2012-08-22 2014-02-26 Metabowerke GmbH Agencement d'engrenage pour une machine-outil et machine-outil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4158313A (en) 1977-07-13 1979-06-19 Smith Arthur W Electric hand tool
DE3932413A1 (de) * 1989-09-28 1991-04-11 Bosch Gmbh Robert Bohrhammer
DE19651828A1 (de) 1996-12-13 1998-06-18 Bosch Gmbh Robert Mehrganggetriebe für Handwerkzeugmaschinen
DE102008054458A1 (de) 2008-12-10 2010-06-17 Robert Bosch Gmbh Handwerkzeugmaschine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1101570A2 (fr) * 1999-11-18 2001-05-23 HILTI Aktiengesellschaft Appareil de forage et de percussion
EP2700477A1 (fr) * 2012-08-22 2014-02-26 Metabowerke GmbH Agencement d'engrenage pour une machine-outil et machine-outil

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3812097A1 (fr) * 2019-10-21 2021-04-28 Makita Corporation Marteau rotatif
CN112757231A (zh) * 2019-10-21 2021-05-07 株式会社牧田 锤钻
US11318596B2 (en) 2019-10-21 2022-05-03 Makita Corporation Power tool having hammer mechanism
US11529727B2 (en) 2019-10-21 2022-12-20 Makita Corporation Power tool having hammer mechanism
US11826891B2 (en) 2019-10-21 2023-11-28 Makita Corporation Power tool having hammer mechanism

Also Published As

Publication number Publication date
DE102017121720A1 (de) 2019-03-21
EP3456479B1 (fr) 2020-02-12

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