EP2142343A1 - Outil à main - Google Patents

Outil à main

Info

Publication number
EP2142343A1
EP2142343A1 EP08708786A EP08708786A EP2142343A1 EP 2142343 A1 EP2142343 A1 EP 2142343A1 EP 08708786 A EP08708786 A EP 08708786A EP 08708786 A EP08708786 A EP 08708786A EP 2142343 A1 EP2142343 A1 EP 2142343A1
Authority
EP
European Patent Office
Prior art keywords
gear unit
gear
overload clutch
hand tool
overload
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
EP08708786A
Other languages
German (de)
English (en)
Other versions
EP2142343B1 (fr
Inventor
Aldo Di Nicolantonio
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 EP2142343A1 publication Critical patent/EP2142343A1/fr
Application granted granted Critical
Publication of EP2142343B1 publication Critical patent/EP2142343B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools

Definitions

  • the invention relates to a hand tool, in particular an electric hand tool, preferably a drill, a hammer drill or a cordless screwdriver according to the preamble of claim 1.
  • Hand tools with a are well known.
  • hand tools For working with different materials and / or tools, in particular drilling tools, it is known to equip hand tools with a, in particular designed as a two-speed spur gear transmission gear.
  • an overload clutch As a torque limiting device in the drive train, with which the maximum transmitted to the tool shaft and / or the rotationally driven tool torque is limited.
  • a maximum torque (release torque) is exceeded, the power flow between the drive (electric motor) and the tool shaft rotatably driven tool as soon as possible interrupted, whereby the operator, the hand tool and the workpiece to be machined or product are protected.
  • a disadvantage of the known hand tools is that regardless of the choice of gear ratio always the same maximum torque is transmitted. A choice between different maximum torques for different gear ratios is not possible if the overload clutch is arranged on the tool spindle. If the overload clutch is on a countershaft, the transmitted torque is determined by the transmission ratio. An independent choice of triggering torque is not possible.
  • the invention is therefore based on the object to provide an alternative design of a hand tool, can be reliably selected with only one switch between at least two different, maximum transmittable torques.
  • the invention is based on the idea of providing at least one second overload clutch in addition to the first overload clutch and assigning it exclusively to a first gear unit so that the second overload clutch is automatically activated when the first gear unit is connected to the drive train for torque transmission purposes.
  • the second overload clutch with the first gear unit forms a functional unit that can be activated or deactivated exclusively as a whole. This makes it possible, by means of a single switch, in particular rotary switch, to change to the first gear unit with the tuned to this second, in particular non-adjustable, overload clutch. A separate switch for switching between the overload clutches is not needed with advantage.
  • the second overload clutch is automatically deactivated or displaced out of the drive train. It is within the scope of the invention to provide, in addition to the first and the second overload clutch, further overload clutches and preferably to associate each overload clutch with a separate gear unit.
  • the at least two overload clutches are dimensioned differently, so that different sized maximum torques can be transmitted.
  • the maximum torque to be transmitted so the triggering torque of the first overload clutch, greater than that of the second overload clutch.
  • An advantage is an arrangement in which at least two gears of the first gear unit have different diameters and at least one gear of the second gear unit has the same diameter as at least one of the gears of the first gear unit.
  • the first overload clutch may be permanently and exclusively operatively connected to the second gear unit.
  • both overload clutches are used exclusively alternatively.
  • the second overload clutch is automatically active, wherein by switching to the second gear unit, only the first overload clutch, which forms a functional unit with the second gear unit, is active.
  • first overload clutch of all gear units, so preferably arrange them in the drive train such that it is always active torque limiting active.
  • a Ü bridging device for the first overload clutch can be provided.
  • the first overload clutch is harder than the second overload clutch.
  • the first overload clutch can be designed as a form-locking latching coupling and the second overloading clutch as a frictionally engaging clutch.
  • the first overload clutch is assigned to all or one group of gear units, it is preferred that when the second gear unit is operated to transmit torque, only the first overload clutch is active. If the first gear unit is switched by means of the single switch, the second overload clutch operatively connected to the first gear unit is additionally automatically activated, so that the triggering torque of the weaker, second overload clutch can be transmitted overall only as maximum torque.
  • the second gear unit is not exclusively associated with an overload clutch. However, embodiments are also conceivable in which the second overload clutch acts on all gear wheel torque-limiting and a plurality of gear units are each configured with its own overload clutch.
  • the gear units transmitting torque at different times are arranged on a motor shaft or a countershaft arranged in the drive train between the motor shaft and the tool shaft.
  • the countershaft is driven by the motor shaft via a spur gear.
  • the first gear unit is assigned to this spur gear, that acts on all disposed on the countershaft gear units.
  • At least one driven gear unit connected to the tool shaft in a rotationally fixed manner but axially adjustable relative to the tool shaft.
  • a plurality of different sized output gears as output gear unit rotatably coupled to each other.
  • 1a is a schematic representation of a hand tool with a two-speed transmission and with two overload clutches
  • FIG. 1b shows a switch for simultaneously setting the gear ratio and the maximum torque to be transmitted for the hand tool shown in FIG. 1a, FIG.
  • FIG. 2b shows an operating switch belonging to the hand tool according to FIG. 2a, FIG.
  • Fig. 3a shows an alternative hand tool with a transmission gear and two overload clutches
  • Fig. 3b shows a switch for a hand tool according to Fig. 3a.
  • FIG. 1 schematically shows a hand tool 1, for example a power drill.
  • the drive train 2 of the hand tool 1 comprises a tool shaft 3 which carries a tool, for example a drill chuck with drill, at its left-hand end in the drawing plane (not shown).
  • a motor shaft 4 of a designed as an electric motor drive 5 is arranged.
  • the first gear unit 7 is a single gear consisting of the first output gear unit 9th and the second gear unit 8, a second, consisting of a single gear output gear unit 10 assigned.
  • either the first or the second output gear unit 9, 10 is rotationally fixed, i. torque transmitting, connectable to the tool shaft 3.
  • a positive connection is produced via corresponding driving balls 12, 13.
  • the second driven gear unit 10 is rotatably connected to the tool shaft 3, whereas the first driven gear unit 9 is rotatable relative to the tool shaft 3.
  • the second gear unit 8 is exclusively associated with a first overload clutch 14 designed as a friction clutch, by means of which the torque is transmitted from the motor shaft to the second gear unit 8, wherein the first overload clutch 14 transmits the maximum limited torque limit.
  • the first overload clutch 14 comprises a movable in the axial direction relative to the motor shaft 4 and rotatably connected to the motor shaft 4 Reibteller 15 which is spring-loaded via springs 16 in the direction of the second gear unit 8.
  • the first overload clutch 14 only ever active torque transmitting or limiting active when the second gear unit 8 is operated to transmit torque.
  • a switch 17 designed as a rotary switch is provided (see FIG. 1b). This is from the switch position shown (K2, 14), in which the first overload clutch 14 is active and a power flow K2 is realized (active second gear unit 8), in a rotated by 90 ° switch position (Kl, 18), whereby (means a shift linkage, not shown) of the wedge 11 is moved in the drawing plane to the left.
  • K2, 14 the switch position shown
  • K2 active second gear unit 8
  • Kl, 18 90 ° switch position
  • the first output gear unit 9 is non-rotatably connected to the tool shaft (positively locking), so that the first gear unit 7 with an associated second overload clutch 18 is active in transmitting torque.
  • the second overload clutch 18 is also provided with a Reibteller 19 which is spring-loaded by means of springs 20 in the axial direction of the first gear unit 7.
  • the first or the second overload clutch (14, 18) for example, be designed as a positive locking detent coupling.
  • the force flux K1 is active via the tool shaft 3, the friction plate 19, the first gear unit 7, the first output gear unit 9 and the tool shaft 3 to the tool, not shown.
  • Both overload clutches 14, 18 are exclusively alternative, in each case together with the associated gear unit 7, 8 active. By switching between the two gear units 7, 8 is simultaneously selected between two different loaned maximum torques, preferably by means of the first overload clutch 14, a higher maximum torque is transferable.
  • a hand tool 1 In Fig. 2a, an alternative embodiment of a hand tool 1 is shown.
  • the also designed as an electric motor drive 5 drives the motor shaft 4 rotating.
  • a first spur gear 21 On the motor shaft 4 is seated a first spur gear 21 which cooperates with a second spur gear 22 to transmit torque.
  • the second spur gear 22 is arranged coaxially to a countershaft 23, wherein the torque is transmitted from the second spur gear 22 to the countershaft 23 via a first overload clutch 14 designed as a positive-locking detent clutch.
  • the first gear unit 7 is associated with a second overload clutch 18 (friction clutch).
  • Each gearwheel 7a, 7b of the first gearwheel unit 7 is assigned an output gearwheel unit 9a, 9b, each consisting of an output gearwheel, which can be operated independently of one another to transmit torque.
  • the second gear unit 8 is associated with a driven gear unit 10 with a single output gear. By adjusting a wedge, not shown, is alternatively between the three output gear units 9a, 9b, 10 selectable.
  • the first overload clutch 14 is designed harder than the second overload clutch 18th
  • the first gear unit 7 are both overload clutches 14, 18 cumulatively active and it is therefore only the triggering torque of the weaker, second overload clutch 18 effective.
  • the second switch position (K2, 18) the second power flow K2 via the second gear 7b of the first gear unit 7 is realized.
  • a low speed of the tool shaft 3 is realized with a low release torque.
  • This setting is suitable, for example, for drilling with diamond drill bits with very large diameters.
  • the third shift position (K3, 14) the power flow K3 extends via the second gear unit 8 and the output gear unit 10, wherein the second gear unit 8 is non-rotatably mounted on the countershaft 23 without an overload clutch.
  • only the first overload clutch 14 is active with a high release torque.
  • the diameter of the gear 7b of the first gear unit 7 corresponds to the diameter of the gear of the second gear unit 8.
  • a single output gear unit 9 is provided on the tool shaft 3 with two gearwheels 24, 25 coupled to one another in a rotationally fixed manner.
  • the output gear unit 9 is axially adjustable by means of the switch 17 shown in Fig. 3b and a shift linkage, not shown, on the tool shaft 3 and rotatably connected in each adjustment position with the Malawiwel- Ie 3.
  • the second gear unit 8 without its own overload clutch and the first gear unit 7 with two gear wheels 7a, 7b are rotatably mounted on the countershaft 23, the diameter of the gear 7a of the first gear unit 7 corresponding to the diameter of the gearwheel of the second gear unit 8.
  • the first gear unit 7 is the second, designed as a friction clutch overload clutch 18 exclusively assigned. From the motor shaft 4 driven by the drive 5, the torque is transmitted to the countershaft 23 via the two spur gears 21, 22 and via the first overload clutch 14 assigned to the second spur gear 22. In the switch position shown (FIG. 3b) (K1, FIG.
  • the force flux K1 initially extends via the spur gears 21, 22 and the first overload clutch 14 to the countershaft 23 and from there via the second gear unit 8 connected in a rotationally fixed manner to the countershaft 23 the first, larger gear 24 of the output gear unit 9 and from there to the tool shaft 3.
  • a low speed of the tool shaft 3 is combined with a hard release torque (first overload clutch 14).
  • This setting is suitable, for example, for screwing in large, long wood screws.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Boring (AREA)
  • Portable Power Tools In General (AREA)
  • Sawing (AREA)

Abstract

Outil à main (1), en particulier outil électrique à main, qui comporte un dispositif d'entraînement (5), un arbre d'outil (3), un premier embrayage de surcharge (14) et un mécanisme multiplicateur (6) pourvu d'une première et d'au moins une deuxième unité à roue(s) dentée(s) (7, 8), les unités à roue(s) dentée(s) (7, 8) pouvant être éventuellement entraînées à transmission de couple. Selon la présente invention, au moins un deuxième embrayage de surcharge (18) se trouve en liaison de coopération permanente et exclusive avec la première unité à roue(s) dentée(s) (7).
EP08708786A 2007-03-28 2008-02-07 Outil à main Not-in-force EP2142343B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007014756A DE102007014756A1 (de) 2007-03-28 2007-03-28 Handwerkzeug
PCT/EP2008/051506 WO2008116689A1 (fr) 2007-03-28 2008-02-07 Outil à main

Publications (2)

Publication Number Publication Date
EP2142343A1 true EP2142343A1 (fr) 2010-01-13
EP2142343B1 EP2142343B1 (fr) 2012-01-11

Family

ID=39295593

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08708786A Not-in-force EP2142343B1 (fr) 2007-03-28 2008-02-07 Outil à main

Country Status (7)

Country Link
US (1) US20090321102A1 (fr)
EP (1) EP2142343B1 (fr)
JP (1) JP5080635B2 (fr)
CN (1) CN101657301B (fr)
AT (1) ATE540783T1 (fr)
DE (1) DE102007014756A1 (fr)
WO (1) WO2008116689A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008040031A1 (de) * 2008-06-30 2009-12-31 Robert Bosch Gmbh Mehrgang-Getriebevorrichtung und Werkzeugmaschine
CN103291855B (zh) * 2013-06-07 2015-07-08 南京唯高机械制造有限公司 一种变速进给箱
DE102013212548A1 (de) * 2013-06-28 2014-12-31 Robert Bosch Gmbh Handwerkzeugmaschinengetriebevorrichtung
CN108167398A (zh) * 2018-01-25 2018-06-15 中铁二院工程集团有限责任公司 一种齿轨列车动力切换装置

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1453032A (en) * 1920-05-03 1923-04-24 Soden-Fraunhofen Graf Alfr Von Change-speed gear
US1415515A (en) * 1920-08-11 1922-05-09 Hendey Machine Company Change-gear mechanism
US2042235A (en) * 1933-12-29 1936-05-26 Lloyd Z Peck Speed change power transmission
US2911841A (en) * 1958-07-02 1959-11-10 Vance V Miller Portable electric hand drill
DE1948055A1 (de) * 1969-09-23 1971-04-01 Impex Essen Vertrieb Elektrisch betriebener Bohrhammer
US4033197A (en) * 1975-04-08 1977-07-05 Kuboto Tekko Kabushiki Kaisha Transmission for tractor
IT1066884B (it) * 1976-08-09 1985-03-12 Star Utensili Elett Trapano del tipo a percussione
DE3043575A1 (de) * 1980-11-19 1982-06-24 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Elektrowerkzeug mit einem zweiganggetriebe und mit einer auf der vorgelegewelle angeordneten ueberlastkupplung
US4513631A (en) * 1983-06-16 1985-04-30 General Motors Corporation Dual input clutch transmission
JPH03202283A (ja) * 1989-12-28 1991-09-04 Makita Corp 電動工具
DE4302083A1 (de) * 1993-01-19 1994-07-21 Black & Decker Inc Kraftgetriebenes Werkzeug, insbesondere Elektrowerkzeug
GB2392966B (en) * 2002-09-13 2006-05-31 Black & Decker Inc Rotary tool with overload clutch
GB0505457D0 (en) * 2005-03-18 2005-04-20 Black & Decker Inc Torque overload clutch for rotary hammer drills
GB2427006A (en) * 2005-06-10 2006-12-13 Black & Decker Inc Overload clutch with two predetermined torque levels
US7793560B2 (en) * 2007-09-11 2010-09-14 Black & Decker Inc. Transmission and variable radially expanding spring clutch assembly

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008116689A1 *

Also Published As

Publication number Publication date
JP5080635B2 (ja) 2012-11-21
DE102007014756A1 (de) 2008-10-02
EP2142343B1 (fr) 2012-01-11
ATE540783T1 (de) 2012-01-15
WO2008116689A1 (fr) 2008-10-02
JP2010522644A (ja) 2010-07-08
US20090321102A1 (en) 2009-12-31
CN101657301A (zh) 2010-02-24
CN101657301B (zh) 2013-03-13

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