EP2234769A1 - Machine-outil dotée d'un dispositif de transmission comportant au moins un arbre intermédiaire logé de façon rotative - Google Patents

Machine-outil dotée d'un dispositif de transmission comportant au moins un arbre intermédiaire logé de façon rotative

Info

Publication number
EP2234769A1
EP2234769A1 EP08866421A EP08866421A EP2234769A1 EP 2234769 A1 EP2234769 A1 EP 2234769A1 EP 08866421 A EP08866421 A EP 08866421A EP 08866421 A EP08866421 A EP 08866421A EP 2234769 A1 EP2234769 A1 EP 2234769A1
Authority
EP
European Patent Office
Prior art keywords
drive
tool
drive shaft
gear
shaft
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Withdrawn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
EP08866421A
Other languages
German (de)
English (en)
Inventor
Kurt Sieber
Otto Baumann
Hardy Schmid
Tobias Herr
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2234769A1 publication Critical patent/EP2234769A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
    • 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
    • B25D2211/006—Parallel drill and motor spindles
    • 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
    • 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
    • B25D2250/165—Overload clutches, torque limiters
    • 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

  • Hand tool with a, at least one rotatably mounted intermediate shaft comprehensive gear device
  • the invention relates to a hand tool with hammer and / or drilling function, in particular a hammer drill.
  • This has at least one, arranged in a machine housing drive unit. Furthermore, at least one two-stage or multi-stage transmission device is arranged in the machine housing.
  • Drive unit comprises a drive shaft and is operatively connected via this with a drive-side, first gear stage of a transmission device.
  • the one transmission device comprises a main output and at least one power take-off.
  • the transmission device has at least one rotatably mounted intermediate shaft, from which branches off a power take-off.
  • a rotatably mounted in the machine housing tool drive shaft for the rotary drive of a used in a tool connected to the tool drive shaft tool holder insert can be driven.
  • the one power take-off allows the drive of a striking mechanism for impact drive of the insert tool.
  • a hammer drill is known in which the tool drive shaft, the intermediate shaft and the drive shaft are arranged parallel to each other and each rotatably supported.
  • the drive shaft and the intermediate shaft are operatively connected to each other via a drive-side spur gear pair as the first gear stage.
  • the main output comprises a second gear stage, which is designed as a driven-side spur gear and via which the tool drive shaft of the intermediate shaft is rotatably driven.
  • the tool drive shaft is designed as a hammer tube.
  • a swash plate is further arranged, which converts the rotational movement of the intermediate shaft in an oscillating transverse movement of a wobble finger.
  • About the wobble finger is an axially displaceable hollow piston arranged in the hammer tube percussion, which is designed as Heilpolster Farbwerk driven.
  • Rotary hammers with such a transmission device are characterized by a particularly compact design and are particularly suitable for compact devices with a so mentioned gun housing. Due to the higher mass of hollow pistons compared to solid pistons, however, these rotary hammers are prone to increased susceptibility to vibration. In particular, hollow piston can not be made of easily constructing plastic. Moreover, in the case of swashplates, the frequency of the oscillating transverse movement of the wobble finger is equal to the speed of a shaft driving the swashplate, ie in the present case the intermediate shaft.
  • a rotary hammer in which the drive shaft and the tool drive shaft are arranged parallel to each other.
  • the transmission device has two perpendicularly arranged intermediate shafts, wherein the one drive side and the other is arranged on the output side.
  • the executed as a hammer tube tool drive shaft is connected via a driven side bevel gear pair with the output side intermediate shaft driven.
  • the two intermediate shafts are operatively connected to each other via a pair of spur gears.
  • the drive-side intermediate shaft furthermore has an eccentric wheel, which acts via a connecting rod on a solid piston of an air cushion impact mechanism arranged in the hammer tube. This will be a
  • the drive-side intermediate shaft is rotatably driven by the rotationally driven drive shaft of the drive unit via a drive-side bevel gear pair.
  • a transmission device allows for the same center distance between the drive shaft and tool drive shaft, the use of a larger percussion caliber as in a swash plate arrangement with a hollow piston percussion.
  • the solid piston can be produced in particularly easy-to-build variants made of plastic.
  • this transmission device comprises at least three gear stages between the drive shaft and the tool drive shaft, which is associated with a correspondingly increased component complexity. This results in an increased susceptibility to tolerances and higher production costs. At the same time this transmission device builds longer, so that a conversion is very complex especially in compact devices with a so-called gun body.
  • the hand tool of the invention has a two- or multi-stage transmission device with a main output and at least one, from a parallel to a tool drive shaft arranged intermediate shaft derived power take-off on.
  • the power take-off comprises at least one pair of bevel gears.
  • the hand tool machine on a striking mechanism, in particular a Lucaspolsterschlagtechnik, with a drivable by a power take-off percussion drive.
  • the percussion drive is designed as a cost-effective, easy mountable eccentric, which is driven by a power take-off, preferably by the bevel gear from the intermediate shaft.
  • the eccentric drive comprises at least one eccentric and at least one connecting rod.
  • the second bevel gear of the pair of bevel gears and the eccentric are arranged on a rotatably mounted percussion drive shaft.
  • the eccentric wheel is driven in rotation by the second bevel gear.
  • the speed of the eccentric wheel can be decoupled from that of the intermediate shaft.
  • the speed of the percussion drive shaft to a multiple, in particular 3 to 6 times lower designed as the speed of the intermediate shaft.
  • a particularly easy to install and tolerances insensitive embodiment of a transmission device according to the invention is achieved by the storage of the first bevel gear and the second bevel gear of the bevel gear pair in a component, in particular in a transmission carrier.
  • the transmission device can be arranged in a separately preassembled transmission carrier.
  • the gear carrier comprises at least two, three or a plurality of bearings for the rotatable mounting of shafts.
  • a transmission device which has a driven-side spur gear pair.
  • the driven-side spur gear pair is preferably arranged as a second or last gear stage in the main output.
  • the output-side spur gear pair between the intermediate shaft and the tool drive shaft is arranged such that a Rotary movement of the rotatably mounted intermediate shaft can be transmitted to the tool drive shaft.
  • a particularly compact and cost-effective design of a transmission device according to the invention can be achieved.
  • a second output-side spur gear of the output-side spur gear pair is further arranged on the tool drive shaft such that it can be driven in rotation by the second output-side spur gear.
  • a meshing engagement of the first output-side bevel gear with the second output-side bevel gear By a meshing engagement of the first output-side bevel gear with the second output-side bevel gear, a rotational movement of the intermediate shaft is transmitted to the tool drive shaft.
  • a ZahnungsInstituts between the first output side spur gear and second output side spur gear is achieved for the respective application favorable ratio of the speed of the intermediate shaft to the speed of the tool drive shaft.
  • the rotational speed of the tool drive shaft is designed to be lower than the rotational speed of the intermediate shaft by a multiple, in particular 3 to 6 times lower.
  • the at least one drive unit of the handheld power tool according to the invention has at least one drive shaft driven in rotation, preferably a motor shaft.
  • the drive shaft is placed in front of a drive side arranged first gear stage of the transmission device according to the invention.
  • the arrangement of the first gear stage between the rotationally driven drive shaft and the intermediate shaft more efficient drive of the intermediate shaft is achieved.
  • the first gear stage comprises at least one drive wheel pair, through which the intermediate shaft can be driven by the drive shaft driven in rotation in a simple, cost-effective and robust manner.
  • a speed of the intermediate shaft of the rotational speed of the driven drive shaft can be decoupled.
  • the speed of the intermediate shaft is designed to be a multiple, in particular 3 to 6 times lower than the speed of the drive shaft. This choice allows the use of low-cost, high-speed drives, in particular electric motors for driving the power tool.
  • a lateral particularly slim design of a drive train of drive unit, gear device, percussion and tool drive shaft can be achieved by a parallel arrangement of the drive shaft and tool drive shaft. If, in addition, the drive wheel pair is designed as a drive-side spur gear pair in this arrangement, then a particularly robust and cost-effective embodiment of a hand tool according to the invention is achieved.
  • the rotatably mounted tool drive shaft and the rotatably driven drive shaft at an angle Wl - in a preferred manner, in particular at right angles - to each other.
  • An effective and easy to produce coupling of the rotatably driven drive shaft and the rotatably mounted intermediate shaft can be achieved - especially in non-parallel arrangement of the drive shaft and tool drive shaft - by forming the Antriebsradfares as an angle gear.
  • bevel, hypoid, spiroplan or worm gear can be used.
  • a particularly versatile embodiment of a hand tool according to the invention is achieved by the integration of at least one shutdown device in the transmission device.
  • the shutdown device allows deactivation of the percussion drive and / or the rotary drive.
  • the hand tool according to the invention can be used in different operating modes.
  • such an embodiment of the hand tool of the invention is achieved, which may include screwdriving, drilling, chiselling and / or percussion drilling.
  • a particularly convenient embodiment of a hand tool according to the invention is achieved by the arrangement of an overload safety clutch in the transmission device for deactivating the rotary drive of the tool drive shaft.
  • the transmission device according to the invention can be advantageously improved by a gear selector device for the rotary drive of the tool drive shaft in their application.
  • the gear selector device has two or more gear ratios between a drive-side input and an output-side output.
  • the gear selector device is arranged in the main output in front of the tool drive shaft.
  • a particularly preferred embodiment of a portable power tool according to the invention comprises a percussion mechanism designed as an air cushion percussion mechanism with a solid piston axially movably mounted in the tool drive shaft.
  • the solid piston on the percussion drive can be driven.
  • the hand tool of the invention has a gun housing.
  • the gun housing accommodates the drive unit, the transmission device, the striking mechanism and the tool drive shaft and is particularly easy to handle.
  • Fig. 1 shows a rotary hammer with pistol-shaped housing as an example of a hand tool of the invention
  • FIG. 3a and 3b are each an arrangement diagram of a further development of a transmission arrangement according to the invention with a rotary drive shut-off Fig. 4a and 4b each an arrangement diagram of a further development of a transmission arrangement according to the invention with a stroke drive shutdown
  • FIG. 5 shows an arrangement diagram of a further development of a transmission arrangement according to the invention with a latching safety clutch
  • Fig. 6 is an arrangement diagram of a further development of a transmission arrangement according to the invention with a gear selector device for the rotary drive
  • Fig. 1 shows a hammer drill 10 with a gun body 12 as an example of a hand tool of the invention.
  • the gun housing 12 includes a drive housing 14 with a gun handle 16 not shown in full, and a transmission housing 18, to which at the front end 20, a tool holder 22 is attached.
  • a drive unit is arranged, of which only one end of a drive shaft 24 is shown.
  • the drive unit comprises an electric motor.
  • the drive shaft 24 may be designed as a motor shaft.
  • the transmission housing 18 encloses a transmission device 26 and a tool drive shaft 28.
  • the tool drive shaft 28 is executed in the hammer drill 10 shown as a hollow cylindrical, rotatably mounted in the gear housing 18 hammer tube 29.
  • This is designed as an air cushion impact 30 percussion 30a with a Schlagtechniksantrieb 31, an axially displaceable solid piston 32, an axially displaceable racket 34 and a likewise axially displaceable striker 36 is arranged.
  • the hammer tube 29 is connected at its end facing the tool holder 22 end face with a tool holder 38 of the tool holder 22.
  • an insertion tool 40 is inserted.
  • the insert tool 40 defines in its longitudinal extent a machine axis 42 around which the hammer tube 29 is arranged coaxially.
  • the transmission device 26 comprises a rotatably mounted intermediate shaft 44, which is aligned parallel to the machine axis 42 and thus to the tool drive shaft 28 and the hammer tube 29.
  • the transmission device 26 is designed in two stages.
  • the transmission device 26 has a drive-side drive wheel pair 50 and output-side spur gear pair 46, which forms a main output.
  • the transmission device comprises a pair of bevel gears 48, which forms a power take-off.
  • the drive wheel pair 50 is designed as a drive-side spur gear pair 51 in the present embodiment.
  • the drive shaft 24 is also aligned parallel to the machine axis 42 and laterally disposed between the tool drive shaft 28, 29 and the intermediate shaft 44.
  • a first drive wheel 52 of the drive wheel pair 50, 51 is disposed on the transmission housing 18 facing the end of the drive shaft 24 and rotatably connected thereto.
  • the first drive wheel 52 meshes with a second drive wheel 54 of the Antriebsradcrues 50, 51, which is arranged on the intermediate shaft 44 and preferably rotatably connected thereto.
  • a first output-side spur gear 56 of the output-side spur gear pair 46 is arranged and in particular rotatably coupled to the intermediate shaft 44.
  • the second output side spur gear 58 to the output side spur gear pair 46 is disposed on the tool drive shaft 28,29 and in particular rotatably coupled thereto.
  • the first output-side spur gear 56 and that second output-side spur gear 58 cooperate in such a way that a rotational movement of the intermediate shaft 44 can be transmitted to the tool drive shaft 28, 29.
  • first and / or second output-side spur gear 56, 58 rotatably mounted on the intermediate shaft 44 and the tool drive shaft 28, 29, by means for rotationally fixing the respective output side spur gears 56, 58 on on the intermediate shaft 44 and the tool drive shaft 28, 29th advantageous extensions of Hand tool according to the invention can be achieved. Examples of this are shown in FIGS. 3a, 3b and 5 and described below.
  • a first bevel gear 60 of the bevel gear 48 is disposed on the intermediate shaft 44, a first bevel gear 60 of the bevel gear 48 and preferably rotatably coupled thereto.
  • the first bevel gear 60 is oriented so that its falling edge 61 of the toothing points in the direction of the drive unit.
  • the bevel gear 48 thus forms a power take-off in the transmission device 26 according to the invention over which the percussion drive 31 can be driven.
  • the percussion drive 31 includes a perpendicular to the tool axis 42 and the
  • Intermediate shaft 44 is arranged between these a percussion drive shaft 62. This is rotatably mounted in the transmission housing 18. At its end facing the intermediate shaft 44, a second bevel gear 64 of the pair of bevel gears 48 is arranged and preferably non-rotatably coupled to the percussion drive shaft 62. The first bevel gear 60 meshes with the second bevel gear 64, so that a rotational movement of the intermediate shaft 44 on the
  • Impact drive shaft 62 can be transferred.
  • the percussion drive shaft 62 carries an eccentric gear 66.
  • an eccentric pin 68 is disposed in a radius R from the axis of rotation of the percussion drive shaft 62.
  • the eccentric pin 68 and the solid piston 32 are operatively connected to each other via a connecting rod 70.
  • first and / or second bevel gear 60, 64 rotatably mounted on the intermediate shaft 44 and the percussion drive shaft 62 can be achieved by means for rotation of the respective bevel gears 60, 64 on the intermediate shaft 44 and the percussion drive shaft 62 advantageous extensions of the hand tool of the invention become. Examples of this are shown in FIGS. 4a and 4b and described below.
  • the transmission device 26 is received in a preassembled transmission carrier 72.
  • the preassembled gear carrier 72 is inserted into the gear housing 18 during assembly.
  • the gear carrier 72 may also initially be arranged on the drive housing 14, preferably flanged.
  • the first bevel gear 60 and the percussion drive shaft 62 are rotatably mounted in the gear carrier 72.
  • the intermediate shaft 44 can be rotatably supported at its drive-side end in the gear carrier 72.
  • a rotary mounting of the tool drive shaft 28, 29 may be provided in the gear carrier 72.
  • the entire transmission device 26 now acts as follows: A rotational movement of the drive shaft 24 caused by the drive unit, in particular the electric motor, is transmitted to the intermediate shaft 44 by the drive wheel pair 50, 51. This is also referred to as a first gear stage. The rotational movement of the intermediate shaft 44 can in turn be transmitted via the output-side spur gear pair 46 to the tool drive shaft 28, 29 - as a so-called second gear stage. This transmission branch represents the so-called main output. About the coupling of the tool drive shaft 28, 29 with the tool holder 38 and not shown here suitable clamping means, the insert tool 40 can be set as a rotary drive in rotation.
  • the pair of bevel gears 48 By the pair of bevel gears 48, a rotational movement of the intermediate shaft 44 is transmitted to the percussion drive shaft 62, so that the eccentric 66 can be set in rotation. In this way, the pair of bevel gears 48 acts as a power take-off. Finally, via the connecting rod 70, the rotation of the eccentric wheel 66 is converted into an oscillating transverse movement of the solid piston 32 along the machine axis 42. This serves the impact drive of the air cushion impact mechanism 30, whereby the striker 36 can act on the insert tool 40 in a striking manner.
  • FIG. 2 a shows a schematic representation of the transmission device 26 according to the invention shown by way of example in FIG. 1. Identical components and features are provided with the same reference numerals. The mode of action is identical in this embodiment with that of the embodiment of Fig.l.
  • FIG. 2b shows a further exemplary embodiment of a transmission device 26 according to the invention. Identical components and features are provided with the same reference numerals.
  • the first bevel gear 60 is arranged on the intermediate shaft 44, that the falling edge 61 of the toothing points in the direction of the first pair of spur gears 46.
  • the mode of operation is identical in this embodiment with that of the embodiment of Fig.l and Fig. 2a.
  • the transmission device 26 is executed in the embodiments of FIGS. 3a, 3b, 4a and 4b described below by a shutdown device 74 expanded.
  • the shutdown device 74 includes a coupling device 76 and, if necessary, not shown here controls.
  • FIGS. 3a and 3b Further developments of the transmission device 26 according to the invention shown in FIG. 2a are shown in FIGS. 3a and 3b.
  • the further development is outlined by way of example on the basis of the exemplary embodiment from FIG. 2a. Identical components and features are provided with the same reference numerals.
  • the coupling device 76 is arranged on the intermediate shaft 44 next to the first spur gear 56.
  • the coupling device 76 has a clutch disc 78, which is axially displaceable on the intermediate shaft 44 but rotatably connected thereto.
  • the first output-side spur gear 56 is not directly rotatably connected to the intermediate shaft 44 in this arrangement.
  • the first output-side spur gear 56 has coupling elements, not shown here, which, together with the clutch disc 78, allow a rotational drive of the first spur gear 56.
  • the coupling devices 76 thus allows a switchability of the rotary drive and is therefore referred to below as the rotary drive coupling 80.
  • 3b shows an alternative embodiment of a rotary drive clutch 80.
  • the clutch plate 78 of the clutch device 76 is disposed on the tool drive shaft 28, 29 adjacent to the second driven side spur gear 58.
  • the clutch disc 78 is rotatably connected to the tool drive shaft 28, 29 and mounted on this axially displaceable.
  • the second output-side spur gear 58 is not rotatable with the analogous to the embodiment in Fig. 5a
  • Tool drive shaft 28, 29 connected and equipped with coupling elements which allow a rotational drive of the tool drive shaft 28, 29 with engaged rotary drive coupling 80.
  • rotary drive clutches 80 can be realized in embodiments according to FIG. 2b of a transmission device 26 according to the invention.
  • FIGS. 4a and 4b A further development of a transmission device 26 according to the invention is shown in FIGS. 4a and 4b.
  • the development is also outlined here by way of example on the basis of the embodiment of FIG. 2a. Identical components and features are provided with the same reference numerals.
  • the coupling device 76 is arranged next to the first bevel gear 60.
  • the coupling device 76 has a clutch disc 78, which is axially displaceable on the intermediate shaft 44 but rotatably connected thereto.
  • the first bevel gear 60 is not directly rotatably connected in this arrangement with the intermediate shaft 44, but has coupling elements not shown here, which together with the engaged clutch disc 78 allow a rotational drive of the first bevel gear 60.
  • the coupling devices 76 in this way allows a switchability of the impact drive and is therefore referred to below as impact drive coupling 82.
  • a coupling device 76 is arranged in addition to the second bevel gear 64.
  • the Coupling device 76 has a clutch disc 78, which is axially displaceable on the percussion drive shaft 62 but rotatably connected thereto.
  • the second bevel gear 64 is not directly rotatably connected in this arrangement with the percussion drive shaft 62, but has coupling elements not shown here, which together with the engaged clutch disc 78 allow a rotational drive of the second bevel gear 64.
  • impact drive clutches 82 may be implemented in embodiments according to FIG. 2b of a gear device 26 according to the invention.
  • a handheld power tool according to the invention may also have two, three or more coupling devices 76.
  • the combination of a rotary drive coupling 80 and a striking drive coupling 82 results in a very flexible embodiment of a handheld power tool 10 according to the invention.
  • rotary drive clutches 80 and / or impact drive clutches 82 are possible beyond the clutch devices 76 described herein with at least one clutch plate 78.
  • those skilled in a plurality of embodiments of coupling devices 76 with clutch disc 78 and coupling elements such as fins, teeth, balls and / or friction surfaces are known, which can be used in a suitable form.
  • the portable power tool 10 according to the invention has an overload safety clutch 83 which acts on the rotational drive of the tool drive shaft 28, 29.
  • the overload safety clutch 83 prevents the user unpleasant rotational forces and / or damage to the hand tool 10 according to the invention in particular in blocking the rotational movement of the insert tool in a workpiece.
  • the overload safety clutch 83 may be designed in one embodiment as Kochrastkupplung, as shown in Fig. 5.
  • the overload safety clutch comprises a clutch spring 84, which is arranged in the direction of the tool holder to the tool drive shaft 28, 29 before the second output-side spur gear 58 and supported on this.
  • the second output-side spur gear 58 has Clutch elements, not shown here, which cooperate with coupling counterparts, also not shown, of a clutch disc 86.
  • the clutch disc 86 is rotatably connected to the tool drive shaft 28, 29.
  • the biased clutch spring 84 presses the coupling elements of the second output-side spur gear 58 with a force F against the clutch counterparts of
  • a further possibility for improving a transmission device 26 according to the invention comprises a gear selector device 88, as shown in FIG. FIG. 6 shows a further development based on the embodiment of a transmission device 26 according to the invention, shown in FIG. 2a, with a gear selection device 88 instead of the output-side spur gear pair 46.
  • the gear selection device 88 shown by way of example has two gears in this example.
  • the gear selection device 88 comprises two drive-side gear-selection spur gears 56a and 56b with different diameters and / or serrations mounted on the intermediate shaft 44 with adjusting means (not shown here) and driven in rotation by the intermediate shaft 44.
  • two output-side gear-selection spur gears 58a and 58b are arranged on the tool drive shaft 28, 29, and connected in a rotationally fixed manner to the latter. In this way, the speed of the tool drive shaft 28, 29 can be adjusted by the user depending on the application of the hand tool of the invention.
  • transmission devices 26 according to the invention can also constitute gear-selection devices 88 as three-or multi-speed versions of advantageous embodiments. Further modifications result from the possibility of combining the transmission device 26 according to the invention via the percussion drive 31 coupled to the described power take-off with different types of striking mechanisms 30, in particular air cushion impact devices 30a. Thus, in particular instead of a solid piston 32 and a hollow piston can be used. Other modifications of a hand tool 10 according to the invention may finally have an eccentric shaft instead of an eccentric wheel 66.
  • the transmission device 26 according to the invention is not limited to hand-held power tools 10 having a housing 12 in the form of a pistol. Rather, a transmission device 26 according to the invention can also be combined in handheld power tools 10 with L-shaped housing, housings with spade handle and / or other housing forms.

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

Abstract

L'invention concerne une machine-outil (10) dotée d'une fonction de martèlement et/ou de perforation, en particulier un marteau perforateur. Cette machine-outil comporte au moins une unité d'entraînement et un arbre d'entraînement d'outil (28, 29) logé de façon rotative et comportant une sonnerie (30). En outre, un dispositif de transmission (26) à deux étages ou plus est en liaison fonctionnelle côté entraînement par l'intermédiaire d'un premier étage de transmission avec l'unité d'entraînement et comporte un arbre intermédiaire (44) logé de manière rotative parallèlement à l'arbre d'entraînement d'outil (28, 29). Le dispositif de transmission (26) présente un arbre de sortie principal et au moins un arbre de sortie auxiliaire dérivé de l'arbre intermédiaire (44), l'arbre d'entraînement d'outil (28, 29) étant en liaison fonctionnelle avec l'arbre de sortie principale pour obtenir l'entraînement rotatif. La sonnerie (30) présente un entraînement de sonnerie (31) réalisé comme un excentrique et en liaison fonctionnelle avec l'arbre de sortie auxiliaire au moins au nombre de un du dispositif de transmission (26). A cet effet, l'arbre de sortie auxiliaire comporte au moins une paire de roues coniques (48), une première roue conique (60) étant disposée sur l'arbre intermédiaire (44).
EP08866421A 2007-12-21 2008-11-03 Machine-outil dotée d'un dispositif de transmission comportant au moins un arbre intermédiaire logé de façon rotative Withdrawn EP2234769A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710062248 DE102007062248A1 (de) 2007-12-21 2007-12-21 Handwerkzeugmaschine mit einer, mindestens eine drehbar gelagerte Zwischenwelle umfassenden Getriebevorrichtung
PCT/EP2008/064845 WO2009083307A1 (fr) 2007-12-21 2008-11-03 Machine-outil dotée d'un dispositif de transmission comportant au moins un arbre intermédiaire logé de façon rotative

Publications (1)

Publication Number Publication Date
EP2234769A1 true EP2234769A1 (fr) 2010-10-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08866421A Withdrawn EP2234769A1 (fr) 2007-12-21 2008-11-03 Machine-outil dotée d'un dispositif de transmission comportant au moins un arbre intermédiaire logé de façon rotative

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DE102010004961A1 (de) * 2010-01-20 2011-07-21 AEG Electric Tools GmbH, 71364 Elektrowerkzeug
CN103079771A (zh) * 2010-08-27 2013-05-01 博世电动工具（中国）有限公司 冲击机构
DE102011007691A1 (de) * 2010-11-29 2012-05-31 Robert Bosch Gmbh Hammerschlagwerk
EP2979819A4 (fr) * 2013-03-26 2016-11-16 Hitachi Koki Kk Outil électrique
WO2022216964A1 (fr) 2021-04-07 2022-10-13 Milwaukee Electric Tool Corporation Outil électrique à percussion
EP4438232A1 (fr) * 2023-03-29 2024-10-02 Hilti Aktiengesellschaft Marteau perforateur à entraînement multiple

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WO2009083307A1 (fr) 2009-07-09

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