EP2240304B1 - Outil électrique - Google Patents

Outil électrique Download PDF

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Publication number
EP2240304B1
EP2240304B1 EP08871992.7A EP08871992A EP2240304B1 EP 2240304 B1 EP2240304 B1 EP 2240304B1 EP 08871992 A EP08871992 A EP 08871992A EP 2240304 B1 EP2240304 B1 EP 2240304B1
Authority
EP
European Patent Office
Prior art keywords
gear
switch element
power tool
motor switch
tool according
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
EP08871992.7A
Other languages
German (de)
English (en)
Other versions
EP2240304A1 (fr
Inventor
Heiko Roehm
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
Priority to EP10188513.5A priority Critical patent/EP2305434B1/fr
Publication of EP2240304A1 publication Critical patent/EP2240304A1/fr
Application granted granted Critical
Publication of EP2240304B1 publication Critical patent/EP2240304B1/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
    • 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 power tool, in particular an electric hand tool, according to the preamble of claim 1.
  • Hand-held power tools such as (cordless) screwdrivers, (cordless) drills or (cordless) impact drills have a manual transmission, the engine speed of about 20,000 rev / min in a useful for the application speed range of the work spindle of about 150 to 2,000 U / min down.
  • the manual transmission of known power handheld power tools is configured as a planetary transmission with two or more gears, so that the operator can choose between at least a fast second low torque gear and a slow first high torque gear.
  • a bistable spring arrangement holds the switching ring resiliently in its two opposite switching positions.
  • the bistable spring arrangement is mechanically mounted on a housing-fixed switching device.
  • the switching device has a manual actuator, which is provided with an acting on a swivel bracket reset hook. This causes the actuator when releasing or returning to the off position, the swivel bracket returns to the second switching position.
  • the invention is therefore based on the object, a power tool, in particular an electric hand tool to propose, in which the gear change can be performed quickly and easily, in particular without having to interrupt a started operation.
  • the invention is based on the idea to couple the directly operable by an operator engine switching element (control) for activating the electric motor, in particular mechanically, with the gearbox, in particular a switching mechanism of, preferably designed as a planetary gearbox, such that the transmission through Actuating the motor switching element between at least two gears is switchable.
  • the gearbox in particular a switching mechanism of, preferably designed as a planetary gearbox, such that the transmission through Actuating the motor switching element between at least two gears is switchable.
  • the engine switching element control element
  • the engine switching element is coupled to the transmission such that the switching between two gears takes place only after covering a predetermined Verstellux.
  • a motor switch assigned to the motor switch element and actuatable by the motor switch element may, for example, be a pure on / off switch for opening and closing the motor circuit.
  • the engine switch may be equipped with an engine speed setting function, such that the engine speed, in particular over the travel (adjustment) of the engine switching element is adjustable.
  • the invention makes it possible to dispense with a separate from the engine switching element Gangumschaltelement (another control element), whereby the Eckcollect of the power tool can be minimized if necessary.
  • the invention provides that the transmission ratio between the first gear and the second gear is selected such that a lower rotational speed and a greater torque can be achieved with the first gear than with the second gear.
  • lighter and more compact power tools can be realized by using smaller (lower-power) electric drive motors for the same performance.
  • the first, slower gear increased torque is transferable.
  • an operator starts a second speed gear with a higher speed and lower torque by operating the motor switch element and towards the end of the screwing, in particular without interrupting the screwing, by further pressing the motor switch element of the second gear switched to the first gear, with the then screwing with greater torque is completed. So far, it was necessary that the operator either performed the entire screwing in the slow first gear or interrupted the screwing for switching from the second gear to the first gear towards the end of the screwing operation.
  • the motor switch element as a trigger switch, in particular as a pawl
  • the pusher switch is preferably coupled directly to a switching mechanism of the gearbox, in particular such that after covering a defined travel of the pusher switch switching between two gears, preferably from the second gear in the first gear, is effected.
  • the increased Verfahrwiderstand which must be overcome by the operator, is advantageously generated in a further development of the invention by means of at least one spring which is formed and arranged counteracting the switching from the second to the first gear.
  • the movement resistance increasing spring endeavors to adjust the engine switch element such that a made change gear is reversed.
  • the engine switch element is preferably adjusted to switch from the second gear to the first gear against the spring force of the spring, so that the spring after reducing the operating force by an operator, the engine switch element adjusted and / or acts on the transmission, that the transmission of the first is switched to second gear.
  • the engine switch element is preferably returned to its original shift position before the gear shift.
  • the motor switch element is mechanically coupled to a switching mechanism of the gearbox, in particular with a, preferably designed as a pivot lever, lever of the switching mechanism.
  • a resistance increasing the spring acts directly on this lever, which in turn acts on the motor switch element with a restoring force.
  • an embodiment can be realized in which a separate gear changeover element (further operating element) is provided in addition to the gear change element enabling gear changeover.
  • This gear shift element is preferably subordinate to the engine switch element with regard to the gear shift function.
  • an embodiment is preferred in which, by means of the motor switch element, despite the manual setting of the gear changeover switch to the second gear on the first gear, in particular towards the end of the travel (adjustment), can be switched.
  • FIG. 1 shows in the only one Fig. 1 a sectional view of a trained as cordless screwdriver electric hand tool.
  • Fig. 1 is designed as a cordless screwdriver electric hand tool 1 is shown.
  • This comprises an electric drive motor 2 of the torque transmitting connected to a planetary gear designed as a two-stage gearbox 3.
  • a work spindle is driven, which operates a tool holder 4 rotating.
  • the tool holder 4 can be formed depending on the application, for example, as a chuck or polygonal recording, in particular hexagonal recording.
  • an exchangeable accumulator pack 5 designed as a tool foot is provided, which can be fixed to a plastic housing 6 of the electric hand tool 1.
  • a motor current switch 7 which acts as a pure on / off switch or as required, For example, by integration of a variable electrical resistance, can be configured as a speed setting switch.
  • the motor current switch 7 can be actuated with a motor switch element 8 designed as a push-button switch element.
  • the motor switch element 8 is arranged in an upper region of a handle 9, which carries the accumulator pack 5 at its lower end and merges in its upper plane in the drawing plane in a substantially transverse to the handle 9 working housing portion 10.
  • the motor switch element 8 actuates a signal generator for electronics which switches the motor current or regulates the speed.
  • the manual transmission 3 is as a basic setting in a second gear, with a greater speed, but only a smaller torque for driving the tool holder 4 can be realized as in a first gear.
  • the motor switch element 8 To activate the drive motor 2, the motor switch element 8 must be actuated by an operator in the direction of the arrow 11, ie in the direction of the housing 6, whereby the motor switch 7 supplies the drive motor 2 with electrical energy.
  • the motor switch element 8 has an integral extension 12 pointing upward in the plane of the drawing. After the motor switch element 8 has been moved so far into the housing 6 in that the extension 12 has traveled the distance s, the extension 12 bears against a pivotably mounted lever 13 of a gear changeover mechanism of the gearbox 3.
  • the motor current switch 7 is formed in a conventional manner such that the motor current is increased with increasing displacement of the motor switch element 8.
  • the motor switch element 8 must be further adjusted in the direction of the housing 6, so that the extension 12 covers a greater distance than the drawn distance s.
  • the force acting on the motor switch element 8 Verfahrwiderstand is greater than at the beginning of the adjustment. This is due to a designed as a helical compression spring spring 14 which presses on a free end portion of the lever 13 in the drawing plane left to right, that is substantially opposite to the arrow 11, and thus endeavors, the lever 13 in its original switching position (second Gang), or to move him back there.
  • the actuation force to be applied by the operator increases as soon as the motor switch element 8 touches or moves the lever 13 designed as a pivot lever, since in addition the spring 14 acting on the lever 13 in the region of its free end must be compressed. If the motor switch element 8 is moved further and thereby the lever 13 is adjusted by means of the integral extension 12 against the spring force of the spring 14, the manual transmission 3 is moved in a conventional manner from the original second to the first gear and remains in the first switching position, how a sufficient actuating force is exerted on the engine switch element 8 by the operator and thus the lever 13, despite the acting spring force 14, remains in a position not shown on the left in the drawing plane.
  • a separate gear change switch for example, on the top of the working housing portion 10, if necessary, can be arranged, it being preferred to arrange such a separate gear change switch the motor switch element 8 in its Gangumschaltfunktion.
  • an additional main electrical switch which can be placed, for example, in the upper area of the working housing section 10 in the plane of the drawing. If it is dispensed with a separate Gangumschaltelement and an additional main switch, the corner measure of the electric hand tool 1 shown is due to the omission of the separate control element less than in known electric hand tools.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Power Tools In General (AREA)
  • Structure Of Transmissions (AREA)
  • Drilling And Boring (AREA)
  • Gear-Shifting Mechanisms (AREA)
  • Arrangement Or Mounting Of Control Devices For Change-Speed Gearing (AREA)

Claims (14)

  1. Outil électrique, en particulier outil électrique à main, comprenant un moteur d'entraînement électrique (2) pouvant être activé par le biais d'un élément de commutation de moteur (8) et une boîte de vitesses (3) entraînée par le moteur d'entraînement (2) et présentant une première et au moins une deuxième vitesse, un plus grand couple pouvant être transmis avec la première vitesse qu'avec la deuxième vitesse, caractérisé en ce que l'élément de commutation de moteur (8) est accouplé à la boîte de vitesses (3) de telle sorte que celle-ci puisse être commutée au moyen de l'élément de commutation de moteur (8) de la deuxième vitesse dans la première vitesse.
  2. Outil électrique selon la revendication 1, caractérisé en ce que l'élément de commutation de moteur (8) est réalisé sous forme d'élément de commutation à bouton poussoir.
  3. Outil électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que pour la commutation de la deuxième vitesse dans la première vitesse, il faut surmonter une résistance au déplacement plus importante que pour l'activation du moteur d'entraînement (2).
  4. Outil électrique selon la revendication 3, caractérisé en ce que la résistance au déplacement plus importante est produite au moyen d'au moins un ressort (14).
  5. Outil électrique selon la revendication 4, caractérisé en ce que le ressort (14) déplace l'élément de commutation de moteur (8) après qu'un opérateur a réduit la force d'actionnement, en particulier le ramène en arrière, de telle sorte que la boîte de vitesses (3) soit commutée de la première dans la deuxième vitesse.
  6. Outil électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément de commutation de moteur (8) est accouplé mécaniquement à un mécanisme de commutation de la boîte de vitesses (3), en particulier à un levier (13) du mécanisme de commutation.
  7. Outil électrique selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un élément de commutation de vitesse séparé de l'élément de commutation de moteur (8) est prévu.
  8. Outil électrique selon la revendication 7, caractérisé en ce que l'élément de commutation de vitesse séparé est subordonné à l'élément de commutation de moteur (8) dans sa fonction de commutation de vitesse.
  9. Outil électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que la commutation de la deuxième vitesse dans la première vitesse a lieu après que l'élément de commutation de moteur (8) a parcouru une course de réglage prédéfinie dans un boîtier (6) de l'outil électrique.
  10. Outil électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que la boîte de vitesses (3) peut être commutée de la première vitesse à nouveau dans la deuxième vitesse par l'élément de commutation de moteur (8).
  11. Outil électrique selon la revendication 10, caractérisé en ce que la boîte de vitesses (3) peut être commutée de la première vitesse à nouveau dans la deuxième vitesse par l'élément de commutation de moteur (8) après qu'un opérateur a réduit la force d'actionnement.
  12. Outil électrique selon la revendication 6, caractérisé en ce que l'élément de commutation de moteur (8) présente une saillie intégrale (12) qui est accouplée au levier monté pivotant (13) du mécanisme de commutation.
  13. Outil électrique selon la revendication 12, caractérisé en ce que par déplacement de l'élément de commutation de moteur (8) dans le boîtier (6), la saillie (12) vient buter contre le levier (13) après avoir parcouru une course de déplacement déterminée (s).
  14. Outil électrique selon l'une quelconque des revendications 12 ou 13, caractérisé en ce que la commutation entre les deux vitesses a lieu par le fait que l'élément de commutation de moteur (8) est déplacé dans le boîtier (6) dans une mesure telle que la saillie (12) parcourt une plus grande distance que la course de déplacement (s).
EP08871992.7A 2008-01-30 2008-10-16 Outil électrique Active EP2240304B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10188513.5A EP2305434B1 (fr) 2008-01-30 2008-10-16 Machine-outil électrique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008000176A DE102008000176A1 (de) 2008-01-30 2008-01-30 Elektrowerkzeug
PCT/EP2008/063949 WO2009095095A1 (fr) 2008-01-30 2008-10-16 Outil électrique

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP10188513.5A Division-Into EP2305434B1 (fr) 2008-01-30 2008-10-16 Machine-outil électrique
EP10188513.5A Division EP2305434B1 (fr) 2008-01-30 2008-10-16 Machine-outil électrique

Publications (2)

Publication Number Publication Date
EP2240304A1 EP2240304A1 (fr) 2010-10-20
EP2240304B1 true EP2240304B1 (fr) 2014-03-05

Family

ID=40121213

Family Applications (2)

Application Number Title Priority Date Filing Date
EP08871992.7A Active EP2240304B1 (fr) 2008-01-30 2008-10-16 Outil électrique
EP10188513.5A Active EP2305434B1 (fr) 2008-01-30 2008-10-16 Machine-outil électrique

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP10188513.5A Active EP2305434B1 (fr) 2008-01-30 2008-10-16 Machine-outil électrique

Country Status (7)

Country Link
US (1) US9878433B2 (fr)
EP (2) EP2240304B1 (fr)
JP (1) JP5574981B2 (fr)
CN (1) CN101932411B (fr)
DE (1) DE102008000176A1 (fr)
RU (1) RU2497656C2 (fr)
WO (1) WO2009095095A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009001132B4 (de) 2009-02-25 2022-04-28 Robert Bosch Gmbh Elektrowerkzeug
DE102010029267A1 (de) * 2010-05-25 2011-12-01 Robert Bosch Gmbh Elektrowerkzeug, insbesondere Bohrschrauber
DE102011086919A1 (de) * 2010-12-15 2012-06-21 Robert Bosch Gmbh Elektrohandwerkzeugmaschine
DE102011004495B4 (de) * 2011-02-22 2021-11-04 Robert Bosch Gmbh Handwerkzeugmaschine
DE102011077442B4 (de) * 2011-06-14 2025-06-26 Robert Bosch Gmbh Getriebelose Handwerkzeugmaschine
JP2015020257A (ja) 2013-07-22 2015-02-02 株式会社マキタ 電動工具
CN104608100B (zh) * 2013-11-04 2017-04-19 南京德朔实业有限公司 一种多用电动工具及其控制方法
DE102016224577A1 (de) 2016-12-09 2018-06-14 Robert Bosch Gmbh Handwerkzeugmaschine

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Also Published As

Publication number Publication date
CN101932411B (zh) 2013-03-27
CN101932411A (zh) 2010-12-29
RU2010135628A (ru) 2012-03-10
EP2240304A1 (fr) 2010-10-20
WO2009095095A1 (fr) 2009-08-06
US9878433B2 (en) 2018-01-30
JP2011510825A (ja) 2011-04-07
US20110000691A1 (en) 2011-01-06
EP2305434B1 (fr) 2014-01-29
JP5574981B2 (ja) 2014-08-20
RU2497656C2 (ru) 2013-11-10
EP2305434A1 (fr) 2011-04-06
DE102008000176A1 (de) 2009-08-06

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