EP3456479B1 - Dispositif d'entraînement pour une machine-outil motorisée - Google Patents

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

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Publication number
EP3456479B1
EP3456479B1 EP18191169.4A EP18191169A EP3456479B1 EP 3456479 B1 EP3456479 B1 EP 3456479B1 EP 18191169 A EP18191169 A EP 18191169A EP 3456479 B1 EP3456479 B1 EP 3456479B1
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EP
European Patent Office
Prior art keywords
drive spindle
transmission arrangement
intermediate shaft
actuator
drive
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
EP18191169.4A
Other languages
German (de)
English (en)
Other versions
EP3456479A1 (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
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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
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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 arrangement for a driven machine tool with a rotating and / or impact driven tool.
  • a machine tool can in particular comprise a drilling or impact drilling machine or a hammer drill with or without a chisel function.
  • a shaft (motor shaft) driven by a drive unit of the machine tool protrudes with its front end into the gear arrangement and drives an intermediate shaft via a drive pinion.
  • the German Offenlegungsschrift discloses DE 196 51 828 A1
  • the intermediate shaft is arranged parallel to the drilling tool axis, but at a distance next to it.
  • the hammer drill further comprises an air cushion percussion mechanism and a wobble drive device which moves back and forth in the direction of the drilling tool axis, the wobble bearing or swash plate of which is mounted on the rotatably drivable intermediate shaft.
  • wobble drive device is understood to mean a rotation / translation converter device in which the rotational movement of an element on the drive side is converted into a linear translation movement of an element on the output side.
  • a rotary element acts on a wobble element, hereinafter referred to as a wobble bearing, in such a way that it is driven back and forth and can thereby set another element in linear translation motion.
  • a drive spindle of the machine tool on which the tool to be rotated can be accommodated, comprises a drill sleeve which, with an external toothed ring, is in engagement with the external toothing of a spur gear of the intermediate shaft seated on the intermediate shaft.
  • the overall length of the gear arrangement is thus significantly influenced by the length and position of the striking mechanism. It must thus be ensured that the wobble bearing does not collide with the driven shaft and / or the spur gear of the intermediate shaft.
  • the distance to be provided for this purpose between the driven shaft, the swash bearing and the spur gear of the intermediate shaft means that the gear arrangement as a whole takes up a relatively large amount of space without this being able to be fully utilized.
  • a hammer drill which has a drive motor with a motor shaft and a tool spindle which is operatively connected to the motor shaft.
  • a striking mechanism which is also operatively connected to the motor shaft, is connected to the tool spindle via a single-stage gear.
  • the single-stage gearbox includes an impact drive wheel that drives the tool spindle via a ring gear.
  • the motor shaft of the drive motor in turn comprises a motor pinion, the toothing of which is in operative engagement with a spur toothing of the striking mechanism drive wheel.
  • the US 4,158,313 A a machine tool comprising a drive spindle for the rotary drive of a tool, a coaxial toothed ring which can be coupled to the drive spindle, and an intermediate shaft which is able to transmit a drive torque from a driven shaft to the drive spindle.
  • the intermediate shaft has a gear wheel which is in engagement with the coaxial ring gear of the drive spindle.
  • gear arrangement additionally includes a further countershaft with a gear.
  • a transmission arrangement according to the preamble of claim 1 in which the fact that the transmission arrangement additionally comprises a countershaft with a gear which, depending on the operating mode of the machine tool, can be brought into engagement with or out of engagement with the coaxial toothed ring of the drive spindle, is a particularly advantageous one Utilization of the available space can be provided.
  • the present invention proposes a gear arrangement with the features of claim 1.
  • the gear arrangement comprises a driven shaft, a drive spindle for the rotary drive of an attached tool, the drive spindle having a coaxial ring gear, and an intermediate shaft, which is able to transmit a drive torque from the driven shaft to the drive spindle.
  • a countershaft with a coaxial gear and a rotation-proof one associated wobble drive device is provided, the wobble drive device being able to convert a rotational movement of the countershaft into a translational movement and to transmit it to the drive spindle for the striking drive of the tool.
  • the intermediate shaft has a first gear that can be brought into engagement with the coaxial ring gear of the drive spindle, and a second gear that can be brought into engagement with the coaxial gear of the countershaft, the first and second gear being axially displaceable relative to the Drive spindle and the countershaft are arranged.
  • the fact that an intermediate shaft and a countershaft are provided means that the entire gear arrangement can be made shorter in the direction of the drilling tool axis, since the wobble drive device and the torque transmission to the drive spindle can be spatially separated from one another.
  • the claimed feature is not essential to the invention and is therefore not essential, 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, for example an electric motor or a pneumatic drive unit, and transmits the drive torques in the usual way to the intermediate shaft of the gear arrangement.
  • the drive spindle is used for the rotary drive of a tool which can be received on the machine tool, the intermediate shaft being able to be brought into engagement with the coaxial ring gear of the drive spindle via a first gear wheel and being able to transmit the drive torque from the driven shaft to the drive spindle.
  • the torque can also be transmitted to the countershaft, as a result of which the wobble drive device connected to it in rotation is driven.
  • This can convert a rotational movement of the countershaft into a translational movement and transmit this translational movement to the drive spindle for the striking drive of the tool.
  • Both the first and the second gear wheel of the intermediate shaft are arranged so as to be relatively displaceable in the axial direction (with respect to the longitudinal axis of the intermediate shaft) to the drive spindle and the countershaft.
  • the intermediate shaft comprises a sliding block which is arranged on the intermediate shaft so as to be displaceable in the axial direction between at least two positions and which has the first gearwheel and the second gearwheel.
  • the first gear and the second gear of the intermediate shaft are axially displaced relative to the intermediate shaft and, due to this displacement movement, are also displaced correspondingly relative to the drive spindle and the countershaft.
  • the shift can be released between two maximum positions, ie between at least two positions.
  • one or more intermediate positions can be selected between these maximum positions, as will be described in more detail below.
  • the gear arrangement further comprises an actuator which can be connected to an actuating element of the machine tool and is designed to convert a switching movement of the actuating element into a displacement of the sliding block in the connected state.
  • Switching between different operating modes of the machine tool can thus be achieved by shifting the first gear and / or the second gear.
  • the two gear wheels 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 operating mode in which the coaxial ring gear of the drive spindle is in engagement with the first gear wheel of the intermediate shaft, and the second gear wheel of the intermediate shaft is out of engagement with the coaxial gear wheel of the countershaft, describes an operating mode in which the drive spindle is only driven in rotation (more pure drilling).
  • the first gearwheel and the second gearwheel of the intermediate shaft are each in engagement with the corresponding coaxial gear rim of the drive spindle or the coaxial gearwheel of the countershaft.
  • the drive spindle is therefore not just rotating also driven striking. This corresponds to the percussion drilling operation of the machine tool.
  • the first gearwheel of the intermediate shaft can be disengaged from the coaxial gear ring of the drive spindle, while the second gearwheel meshes with the coaxial gearwheel of the countershaft. In this operating mode, therefore, no more torque is transmitted to the drive spindle, but only a translational movement generated by the wobble drive device for the striking drive of the tool (chisel operation).
  • the actuating element can comprise, for example, a rotary knob, the rotational movement of which, in a known manner, causes a translational movement of the actuator connected to it, 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 actuator connected to it, which in turn displaces the sliding block in the axial direction.
  • alternative configurations are also conceivable, such as an axially displaceable actuating element.
  • the actuator is fixedly connected to the sliding block in the axial direction.
  • the actuator is further arranged in a rotationally fixed manner within the gear arrangement and in particular a toothed projection has, which can be brought into locking engagement with the coaxial ring gear of the drive spindle in a switching position of the actuator.
  • the drive spindle is not only not to be driven in rotation by the drive unit, but also to be held non-rotatably, in order to ensure a defined orientation of the tool, in particular when using a flat chisel.
  • the toothed projection can have at least one or more teeth, the outer contour of which or forms an opposite contour to the contour of the tooth circle of the drive spindle. In this way, a reliable locking of the drive spindle is achieved by engaging the counter-contour of the toothed attachment with the outer contour of the toothed circle of the drive spindle.
  • the actuator can in particular be arranged on the sliding block in such a way that an intermediate position in which the projection of the actuator is not yet in engagement with the coaxial ring gear of the drive spindle and fixes it in a rotationally fixed manner, but in which there is no longer any torque transmission from the intermediate shaft to the drive spindle takes place since the first gear is already disengaged from the coaxial ring gear of the drive spindle.
  • This intermediate position enables the setting of, for example, a flat chisel in its desired orientation.
  • the flat chisel remains in its desired orientation, since the drive spindle is now held in a rotationally fixed manner by the actuator, which is also arranged in a rotationally fixed manner, which enables defined machining with a flat chisel becomes.
  • the actuator for the rotationally fixed arrangement within the gear arrangement has a first receiving area for receiving an end section of the countershaft and a second receiving area for receiving an end portion of the intermediate shaft.
  • the two receiving areas of the actuator form bearing points and enable a rotationally fixed arrangement of the actuator within the gear arrangement. Components which are required anyway are used for this rotationally fixed arrangement, which in turn saves installation space and weight.
  • the first receiving section of the actuator comprises a circular recess, the inside diameter of which corresponds essentially to the outside diameter of the end section of the countershaft.
  • the recess is designed in particular as a through hole in order to enable the actuator to be axially displaceable with respect to the intermediate shaft.
  • the second receiving section of the actuator can comprise a laterally open circular recess, the inside diameter of which corresponds essentially to the outside diameter of the end section of the intermediate shaft and whose lateral opening is less than 180 degrees, in particular less than 160 degrees, for example 150 Includes degrees of angle.
  • This laterally opened circular recess can also be designed as a through recess in order to provide the axial displaceability of the actuator in a simple manner.
  • a simplified assembly can be provided through the lateral opening, ie because no circumferential inner peripheral surface is provided. The end section to be accommodated can be inserted laterally through this opening.
  • a flattening can also be provided on the end section to be accommodated. If the actuator is now rotated in the assembled state relative to the accommodated end section, in particular relative to the flattening, a detachment movement of the accommodated end section from the lateral opening can optionally be prevented.
  • a preferred orientation of the lateral opening in the installed state of the actuator can ensure that rotation of the actuator about the axis of rotation of the countershaft and thus about the bearing point formed by the first receiving section of the actuator is prevented.
  • the lateral opening is oriented such that the end section of the intermediate shaft is engaged behind by the actuator in the assembled state and thus counteracts such an undesirable rotary movement.
  • the gear arrangement further has an air cushion percussion mechanism which is connected to the drive spindle.
  • the air cushion percussion mechanism can be partially formed integrally with the drive spindle or separately and can be firmly connected to it in the assembled state.
  • Such an air cushion percussion mechanism can comprise a percussion piston, an anvil as well as an excitation sleeve and a drilling sleeve in the usual way, wherein the excitation sleeve can be slidably received within the drilling sleeve and can form a space receiving the air cushion with it.
  • the percussion piston can be set into a reciprocating movement within the space by means of the excitation sleeve, which movement is transmitted via the striker to a tool accommodated in the tool holder of the drive spindle.
  • One or more parts of the striking mechanism can be formed integrally with the drive spindle or can be firmly connected to it.
  • the driven shaft can be arranged at an angle, in particular at a right angle, to the drive spindle.
  • a compact hammer drill with an L-shaped housing with optimal use of the housing space can be provided.
  • the intermediate shaft has a ring gear connected to it in a rotationally fixed manner, which meshes with a pinion of the driven gear Wave stands. This enables a right-angled arrangement of the intermediate shaft and the driven shaft.
  • the present invention also relates to a machine tool with a housing, in particular in an L-shaped construction, in which the housing can comprise at least a first housing part with a first longitudinal axis and a second housing with a second longitudinal axis, and in which the first and second longitudinal axes are not arranged parallel to each other, and with a gear arrangement with one or more of the features described above.
  • the Figure 1 shows a transmission arrangement according to the invention, which is generally designated by 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 at its free end 16 facing away from the driven shaft 12 a tool holder (not shown) for holding a tool, for example a drill or chisel.
  • the drive spindle 14 comprises a drill sleeve 18 which engages around it in sections.
  • the drive spindle 14 extends in a longitudinal direction L, which coincides with a tool axis (drilling tool axis).
  • the intermediate shaft 20 and the wobble drive shaft 30 extend parallel to the drive spindle 14.
  • the respective axes of rotation are arranged parallel to the longitudinal direction L and are not described in detail.
  • the intermediate shaft 20 serves to transmit a drive torque from the driven shaft 12 to the drive spindle 14.
  • the intermediate shaft 20 has a ring gear 22 with an end 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 to the intermediate shaft 20 via the external toothing 12a and the toothing 22a of the ring gear 22 (cf. also Figure 3 ).
  • the intermediate shaft 20 also has a switching block or sliding block 44 which engages in a spline toothing 46 on the outer circumference of the intermediate shaft 20 and is thus displaceable along the intermediate shaft 20, but is non-rotatably mounted thereon.
  • the direction of displacement of the sliding block 44 is in the Figures 1 and 3 indicated by the double arrow S.
  • the sliding block 44 has a first ring gear 24 which engages is 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 sliding block 44 is designed to be displaceable along the longitudinal axis of the intermediate shaft 20, which coincides with its axis of rotation and is therefore parallel to the longitudinal axis L 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 ring gear 42 which, depending on the position of the sliding block 44, can be brought into engagement with a ring gear 26 of the wobble drive shaft 30.
  • the torque of the intermediate shaft 20 can be used not only to drive the drive spindle 14 by transferring it via the first ring gear 24 to the ring gear 28 of the drive spindle 14, but also to drive the wobble drive shaft 30 by the torque is transmitted via the second ring gear 42 to the ring gear 26 of the wobble drive shaft 30.
  • a wobble 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 it (cf. also Figure 2 ), a wobble drive device 32 is arranged. This includes a wobble bearing 34, which is connected in a rotationally fixed manner to the wobble drive shaft 30, and a connecting means 36, which is accommodated in the manner of a ball joint in a corresponding receptacle 38a of a reciprocating piston or an excitation sleeve 38.
  • the wobble drive device 32 serves, in a known manner, for a rotational movement of the wobble drive shaft 30 in a translational movement T (cf. Figure 3 ) to convert and if necessary to transmit this to the excitation sleeve 38 via an air spring.
  • the gear arrangement 10 comprises an impact mechanism 40, which can be designed, for example, as an air cushion impact mechanism and can comprise an impact piston, an anvil, as well as the excitation sleeve 38 and a drilling sleeve, wherein the excitation sleeve 38 can be slidably received within the drilling sleeve and with it the air cushion can form the receiving space.
  • the percussion piston is set in a reciprocating movement within this space receiving the air cushion by means of the excitation sleeve 38, which movement is transmitted via the striker (not shown) to a tool accommodated in the tool holder of the drive spindle 14. If the wobble drive shaft 30 is consequently driven via the toothed ring 28, the wobble drive device 32 converts this rotary movement into a translatory movement T, which, with the aid of the striking mechanism 40, produces a striking movement of the tool received.
  • 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 striking drilling operation (hammer drilling position), in which the tool on the one hand performs a rotary movement and on the other hand experiences an impact movement in addition to the rotary movement (hammer drilling operation).
  • the second ring gear 42 can be brought out of engagement with the ring gear 26 of the wobble drive shaft 30.
  • the wobble drive shaft 30 is no longer rotated; the wobble drive device 32 consequently stands still, so that no more translational movement is transmitted to the drive spindle 14.
  • This operating position thus describes an operating mode in which the drive spindle 14 is only driven in rotation by means of the intermediate shaft 20 and the first ring gear 24 of the sliding block 44 (drilling position), so that a tool accommodated in the tool holder is only driven in rotation (drilling operation).
  • the sliding block 44 can also be moved to the left in the direction S, so that the first ring gear 24 disengages from the ring gear 28 of the drive spindle 14.
  • the second ring gear 42 remains in rotational engagement 26 with the wobble drive shaft 30, as a result of which the wobble drive device 32 continues to be driven and transmits a translational movement T to the drive spindle 14 (chisel position).
  • a tool received on the tool holder only experiences a purely striking movement, since no torque is transmitted to the drive spindle 14 via the toothed ring 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 also has on its outer circumference (cf. also Figure 4 ) has a toothing section 54, the toothing of which corresponds to the external toothing of the ring gear 28. If the sliding block 44 is shifted to the left for hammer operation or chisel operation, the shift fork 50 can be brought into non-rotatable 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 section of the actuator), an undesired pivoting movement of the shift fork 50 around the first bearing point 52 as a result of an undesired 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. This ensures simple assembly and, at the same time, secure mounting of the shift fork 50.
  • an operating element 60 which is designed in the form of a rotary handle, is also clearly visible. If the user now turns the rotary handle 60, which in the assembled state is attached to the outside of the machine tool housing (not shown) and projects through it, the rotary movement of the rotary handle 60 is converted into a translatory movement (operating movement B) in a known manner via an adjusting wire 62. the shift fork 50 and associated with the sliding block 44 converted.
  • the selector wire 62 is connected in a known manner to the selector fork 50 via holding structures 70, 72 and is mounted thereon.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Claims (12)

  1. Dispositif d'entraînement (10) pour une machine-outil motorisée avec un outil entraîné en rotation et/ou par percussion, qui peut être fixé à la machine-outil de manière amovible, comprenant :
    - un arbre entraîné (12) ;
    - une broche d'entraînement (14) pour entraîner en rotation un outil fixé de manière amovible, dans lequel la broche d'entraînement (14) comprend une couronne dentée coaxiale (28), ainsi que
    - un arbre intermédiaire (20), qui est capable de transmettre un couple d'entraînement de l'arbre entraîné (12) à la broche d'entraînement (14) ; et
    - un arbre de renvoi (30) avec une roue dentée coaxiale (26) et un moyen d'entraînement oscillant (32) fixé en rotation à celui-ci, dans lequel le moyen d'entraînement oscillant (32) est capable de transformer un mouvement de rotation de l'arbre de renvoi (30) en un mouvement de translation (T) et de le transmettre à la broche d'entraînement (14) pour l'entraînement par percussion de l'outil,
    caractérisé en ce que l'arbre intermédiaire (20) comprend une première roue dentée (24) qui peut venir en prise avec la couronne dentée coaxiale (28) de la broche d'entraînement (14), ainsi qu'une seconde roue dentée (42) qui peut venir en prise avec la roue dentée coaxiale (26) de l'arbre de renvoi (30),
    dans lequel la première et la seconde roues dentées (24, 42) sont disposées dans la direction axiale de manière mobile relativement à la broche d'entraînement (14) et à l'arbre de renvoi (30).
  2. Dispositif d'entraînement (10) selon la revendication 1,
    caractérisé en ce que l'arbre intermédiaire (20) comprend un bloc coulissant (44), qui est disposé sur l'arbre intermédiaire (20) dans la direction axiale de manière mobile entre au moins deux positions et qui comprend la première roue dentée (24) et la seconde roue dentée (42).
  3. Dispositif d'entraînement (10) selon la revendication 1 ou 2,
    caractérisé en ce qu'il comprend en outre un actionneur (50), qui peut être relié à un élément d'actionnement (60) de la machine-outil et est configuré pour transformer, dans l'état relié, un mouvement de commutation de l'élément d'actionnement (60) en un déplacement du bloc coulissant (44).
  4. Dispositif d'entraînement (10) selon la revendication 2 et 3,
    caractérisé en ce que l'actionneur (50) est relié de manière solidaire au bloc coulissant (44) dans la direction axiale.
  5. Dispositif d'entraînement (10) selon la revendication 3 ou 4,
    caractérisé en ce que l'actionneur (50) est en outre disposé de manière fixe en rotation à l'intérieur du dispositif d'entraînement (10) et comprend en particulier une saillie dentée (54) qui, dans une position de commutation de l'actionneur (50), peut venir en butée d'engagement avec la couronne dentée coaxiale (28) de la broche d'entraînement (14).
  6. Dispositif d'entraînement (10) selon une des revendications 3 à 5,
    caractérisé en ce que l'actionneur (50) disposé de manière fixe en rotation à l'intérieur du dispositif d'entraînement (10) comprend une première zone de réception pour recevoir une section d'extrémité de l'arbre de renvoi (30) et une seconde zone de réception pour recevoir une section d'extrémité de l'arbre intermédiaire (20).
  7. Dispositif d'entraînement (10) selon la revendication 6,
    caractérisé en ce que la première zone de réception de l'actionneur (50) comprend un évidement circulaire dont le diamètre intérieur correspond sensiblement au diamètre extérieur de la section d'extrémité de l'arbre de renvoi (30), et/ou la seconde zone de réception de l'actionneur (50) comprend un évidement circulaire ouvert latéralement, dont le diamètre intérieur correspond sensiblement au diamètre extérieur de la section d'extrémité de l'arbre intermédiaire (20) et dont l'ouverture latérale (58) comprend un angle inférieur ou égal à 180 degrés, en particulier inférieur ou égal à 160 degrés, par exemple 150 degrés.
  8. Dispositif d'entraînement (10) selon l'une des revendications précédentes,
    caractérisé en ce que l'ouverture latérale est orientée de telle sorte que la section d'extrémité de l'arbre intermédiaire (20) à l'état monté de l'actionneur (50) est bloquée à l'arrière de manière à empêcher tout mouvement de rotation non souhaité de l'actionneur (50).
  9. Dispositif d'entraînement (10) selon l'une des revendications précédentes,
    caractérisé en ce qu'il comprend en outre un mécanisme de frappe à coussin d'air (40) qui est relié de manière solidaire à la broche d'entraînement (14).
  10. Dispositif d'entraînement (10) selon l'une des revendications précédentes,
    caractérisé en ce que l'arbre entraîné (12) est disposé à un certain angle, en particulier à angle droit, par rapport à la broche d'entraînement (14).
  11. Dispositif d'entraînement (10) selon l'une des revendications précédentes,
    caractérisé en ce que l'arbre intermédiaire (20) comprend une couronne dentée reliée de manière fixe en rotation à celui-ci, qui est en prise avec un pignon de l'arbre entraîné (12).
  12. Machine-outil comprenant un boîtier, en particulier dans un mode de construction en forme de L, selon laquelle le boîtier comprend au moins une première partie de boîtier avec un premier axe longitudinal et une seconde partie de boîtier avec un second axe longitudinal et les premier et second axes longitudinaux ne sont pas disposés parallèlement l'un à l'autre, et comprenant un dispositif d'entraînement (10) selon l'une des revendications 1 à 11.
EP18191169.4A 2017-09-19 2018-08-28 Dispositif d'entraînement pour une machine-outil motorisée Active EP3456479B1 (fr)

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JP7360891B2 (ja) * 2019-10-21 2023-10-13 株式会社マキタ ハンマドリル
US11318596B2 (en) 2019-10-21 2022-05-03 Makita Corporation Power tool having hammer mechanism
JP7465647B2 (ja) * 2019-10-21 2024-04-11 株式会社マキタ ハンマドリル

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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
DE19955412A1 (de) * 1999-11-18 2001-05-23 Hilti Ag Bohr- und Meisselgerät
DE102008054458A1 (de) 2008-12-10 2010-06-17 Robert Bosch Gmbh Handwerkzeugmaschine
DE102012214938B4 (de) 2012-08-22 2016-11-10 Metabowerke Gmbh Getriebeanordnung für eine angetriebene Werkzeugmaschine sowie Werkzeugmaschine mit einer solchen Getriebeanordnung

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EP3456479A1 (fr) 2019-03-20

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