EP1838500A1 - Dispositif de commutation - Google Patents

Dispositif de commutation

Info

Publication number
EP1838500A1
EP1838500A1 EP05763069A EP05763069A EP1838500A1 EP 1838500 A1 EP1838500 A1 EP 1838500A1 EP 05763069 A EP05763069 A EP 05763069A EP 05763069 A EP05763069 A EP 05763069A EP 1838500 A1 EP1838500 A1 EP 1838500A1
Authority
EP
European Patent Office
Prior art keywords
switching
switching device
eccentric
eccentric element
movement
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Withdrawn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
EP05763069A
Other languages
German (de)
English (en)
Inventor
Achim Duesselberg
Andre Ullrich
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 EP1838500A1 publication Critical patent/EP1838500A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • 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
    • B25D2250/045—Cams used in percussive tools
    • 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
    • B25D2250/371—Use of springs

Definitions

  • the invention relates to a switching device according to the preamble of claim 1.
  • a hand tool with a Weg ⁇ device which comprises a rotatably mounted on a housing of the power tool control element and an Ex ⁇ zenterelement, which is connected to the operating element.
  • the eccentric element is in direct or indirect operative connection with a switching piece or a switching plate, which is axially fixedly connected to a switching element of the hand-held power tool.
  • An indirect active compound can spielvati be prepared by a leg spring. Via the eccentric element and the operative connection, a rotational movement is transferred directly or through the leg spring into a translational movement of the switching element of the manual machine, by which an engagement between a profile of the switching element and a complementary profile of a transmission of the hand tool machine is ultimately produced / or solves.
  • This allows certain functional units of the power tool, in a hammer drill, for example, a striking mechanism and a rotary drive, to a drive of
  • Hand tool can be coupled or ist ⁇ coupled from the drive.
  • the invention relates to a switching device with a rotatably mounted operating element and an eccentric element for translating a rotational movement of the operating element into a translational movement of a switching element, in particular a switching shaft of a hand tool.
  • a shape of the eccentric element deviates substantially from a stick shape. Since a dependence of the translational movement on a rotational movement of the operating element is determined by the shape of the eccentric element, this dependence can be shaped by a suitable choice of the shape in a manner that appears appropriate to a person skilled in the art. In particular, a degree of dependence or a sensitivity of the operating element can be determined to improve operating convenience as a function of a switching position of the operating element in a manner that appears appropriate to a person skilled in the art.
  • Eccentric an eccentric with respect to a rotational axis of the control element arranged element are referred to, which preferably does not surround the axis of rotation with its convex hull.
  • the term "pin shape” should be understood to mean an elongate shape whose length in the axial direction is greater than a width or a cross-sectional dimension and / or whose cross-sectional dimensions are smaller than an eccentricity of the eccentric element "Deviation from a pencil shape” should be considered as "essential” if it is used to specifically modify a sinusoidal shape generated by the pencil shape. gene dependence of the translational movement of the Drehbewegng is suitable.
  • a cross section of the eccentric element deviates substantially from a circular shape. This allows a particularly advantageous variability of the dependence between translational movement and rotational movement can be achieved.
  • a cross-sectional dimension of the eccentric element is of a magnitude of an eccentricity of the eccentric element.
  • a cross-sectional dimension should be understood to mean a typical length scale of the cross-section, for example an extent in the circumferential direction or an extent in the radial direction relative to a rotational axis of the operating element. Within one order of magnitude there are two sizes, if they differ by less than a factor 5-10.
  • the eccentric element has a guide surface which is provided for transmitting the rotational movement via a contact point which migrates on the guide surface during the rotational movement.
  • a particularly reliable determination of the dependence can be achieved.
  • Canting between movably mounted elements can be safely avoided, and a closure can be advantageously kept small.
  • the contact point is a contact point of the eccentric element with a further element, which is advantageously in operative connection with the switching element.
  • a synchronization spring of a hand-held power tool gear it is particularly advantageous for a synchronization spring of a hand-held power tool gear to be present at the contact point.
  • the guide surface is in accordance with a predetermined
  • the guide surface is substantially parabolic. As a result, it is possible to achieve an advantageously antisymmetric course of the dependency, in particular when a vertex of the parabola points outward in the radial direction. If the contact point moves in the region of the vertex of the element, an at least substantial independence of the position of the switching element from a rotational position of the operating element can be achieved, whereby an advantageous tolerance insensitivity can be achieved in this region.
  • the eccentric element has at least two guide surfaces, it can advantageously be achieved that, with a rotational movement of the operating element, two movements of further switching elements are generated in a well-defined manner.
  • the guide surfaces determine a movement of springs of a sauschenkli- gene spring.
  • a position and a bias of the two-legged spring can advantageously be independently be ⁇ tunable. If an eccentricity of the contact point during a switching movement varies by at least 10%, a clearly perceptible comfort gain for an operator can be achieved, whereby this comfort gain can be even more pronounced if the eccentricity of the contact point varies by at least 50% during a switching movement.
  • the switching device comprises a two-legged shift spring.
  • Two configuration parameters for example a rotational position and a bias of the two-legged Wegfe ⁇ , are advantageously independently determined to optimize a course of the switching movement when the switching spring touches the eccentric element in at least one operating configuration in two points of contact, with an advantageous clearance Spiel ⁇ can be ensured when the switching spring is biased by the eccentric element in at least one operating configuration.
  • FIG. 2 shows a switching device of the hand tool of FIG. 1, FIG.
  • Fig. 4 is a switching spring and an operating element of the switching device of Figures 2 and 3 and
  • FIG. 5 shows a graph of the dependence of a position of the switching element on a rotational position of the operating element from FIGS. 1 to 4.
  • FIG. 1 shows a hand tool embodied as a hammer drill with a control element 10 mounted on a housing of the hand tool.
  • the hand tool comprises an electric motor and a transmission with a switching element 18, which are switched by the operator into one of three operating modes with the aid of the control element 10 can.
  • the electric motor via the transmission drives a tool holder 36 rotating.
  • the electric motor additionally drives a striking mechanism 38.
  • the rotary drive of the tool holder 36 decoupled from the electric motor, and the electric motor drives only the percussion 38 at.
  • the percussion mechanism 38 has a striker, not shown here, and a piston which is periodically displaced via a wobble bearing 40 with a wobble finger 42 in operation in a hammer tube.
  • the control element 10 is rotatably mounted on the housing of the power tool via a circumferential groove ( Figure 2) and has a gripping bar on its side projecting beyond an outer side of the housing.
  • the operating element 10 On a side projecting into an interior of the housing or of the hand-held power tool, the operating element 10 has a parabolic or U-shaped eccentric element 12, which points radially outwards with a vertex.
  • the parabolic cross-section of the eccentric element 12 is invariable over a depth of the eccentric element 12 which extends in the axial direction with respect to an axis of rotation of the operating element 10. In this case, the axis of rotation is arranged completely outside of the eccentric 12.
  • the operating element 10 is designed as a plastic casting and the eccentric element 12 is formed on the operating element 10.
  • the switching spring 34 is attached with a loop-shaped spring spiral on a angeform ⁇ to the housing of the power tool machine, inwardly projecting bolt 44 and under Ü Overcoming a small frictional force rotatably mounted on the bolt 44.
  • the switching spring 34 has two legs, which bear against the eccentric element 12 at two substantially opposite points. A first limb bears against a contact point 28 of the guide surface 24 and a second limb
  • a cross-sectional dimension 20 and a distance of Be ⁇ rround as 28, 30 is greater than a distance of the two legs of the switching spring 34 in a rest configuration of the switching spring 34, so that the switching spring 34 by the between the Schen ⁇ angle introduced eccentric 12 is biased.
  • the contact points 28, 30 move on the guide surfaces 24, 26, wherein the switching spring 34 rotates on the bolt 44 to achieve a state of minimum energy.
  • the distance of the contact points 28, 30 changes in a manner determined by the shape of the guide surfaces 24, 26, and with it the bias of the switching spring 34 varies.
  • Free ends of the switching spring 34 engage a switching plate 46 which engages in a circumferential groove of a switching sleeve 48 ein ⁇ .
  • the switching plate 46 is guided on a parallel to a An ⁇ drive shaft 52 extending guide rod 62 in the axial direction.
  • the shift sleeve 48 is plugged onto a distributed region 50 of a drive shaft 52 and mounted rotatably and axially displaceably via an inner profile and an outer profile of the region 50 with respect to a rotational axis of the drive shaft 52 extending perpendicular to the axis of rotation of the operating element 10.
  • the wobble bearing 40 On a first side of the region 50, the wobble bearing 40 is attached to the drive shaft, which on the side facing the region 50 has a sleeve-shaped projection with an outer profile which corresponds to the inner profile of the switching sleeve 48.
  • the swash bearing 40 needle bearing 54, 54 ⁇ On an inner surface, the swash bearing 40 needle bearing 54, 54 ⁇ , via which the swash bearing 40 is rotatably mounted on the drive shaft 52.
  • a toothed wheel 56 is mounted on the drive shaft 52, into which a corresponding toothed wheel 58 engages.
  • the toothed wheel 58 is in active connection with the tool holder 36.
  • the toothed wheel 56 has a sleeve-shaped extension extending in the direction of the region 50 and having an outer profile which corresponds to an inner profile of the switching sleeve 48.
  • Surface at a réelle ⁇ , the gear 56 needle bearings 54, 54 ⁇ , via wel ⁇ 56 che gear rotatably mounted on the drive shaft 52 is mounted.
  • the gear 56 can slide by sliding the shift sleeve 48 in the direction of the sleeve-shaped Fortsatzes of the gear 56 rotatably connected to the drive shaft 52 and 50 are connected to the area.
  • a rotational movement of the drive shaft 52 is transmitted to the gear 56 and from there to the gear 58 and to the tool holder 36, whereby a rotary drive of the tool holder 36 is activated.
  • the switching device has a total of three switching positions. In a middle switching position, the shift sleeve 48 is in engagement with the gear 56, the region 50 and the Tau ⁇ mellager 40, so that the striking mechanism 38 is activated. The hand tool is then switched ge in a Schlagbohrmodus.
  • the switching spring 34 pivots through the force transmitted via the contact point 30 through the second leg into the direction of rotation of the operating element 10 opposite direction, where the free end of the first leg exerts a force on the switching plate 46 and the switching sleeve 48, the moves in the direction of the gear 56.
  • the shift sleeve 48 slides off the sleeve-shaped extension of the tumbler 40 and thereby decouples the percussion mechanism 38 from the drive shaft 52.
  • the eccentric element 12 therefore translates the rotational movement 14 of the operating element 10 into a translational movement 16 of the switching element 18.
  • a free end of the second leg of the switching spring 34 displaces the switching element 18 in the direction of Swash bearing 40 until an end face of the inner profile of the shift sleeve 48 comes to an end face of the outer profile of the sleeve-shaped extension of the swash bearing 40 to the plant.
  • Another rotation of the control element 10 in a clockwise direction leads to a release of the second leg from the contact point 28 on the guide surface 26 of the eccentric 12 and an increased bias of the switching spring 34.
  • the inner profile and the outer profile can slide into one another , so that the switching sleeve 48 is moved by the spring force in the first, middle position and thus brings the Hand ⁇ machine tool in the Schlagbohrmodus and the striking mechanism 38 couples to the drive.
  • FIG. 5 shows the profile of the translatory movement 16 as a function of a rotation angle 32 of the operating element 10 in an angle range between 0 ° and 90 °, wherein the angle 0 ° of the first rotational position is associated with gripping bars extending perpendicular to the axis of rotation of the drive shaft 52.
  • the contact point 30 slides over the guide surface 26, whereby an eccentricity 22 of the contact point 30 or a distance of the contact point 30 from the axis of rotation of the operating element 10 is doubled.
  • the eccentricity 22 is equal to the distance between the two outermost ends of the legs of the eccentric 12 in the rotational angle 32 of the first position. This distance is equal to the length of the two legs of the eccentric 12.
  • the distance forms a typical cross-sectional dimension 20 of the eccentric 12.
  • the contact point 28 remains during the rotational movement 14 from 0 ° to 90 ° in a substantially constant position at the end of the guide surface 24, which forms an edge about which the first leg of the switch spring 34 rotates.
  • a gradient of the graph of the translation movement 16 shown in FIG. 5 reaches a maximum in a switching region 60 in which the end faces of the profiles of the switching sleeve 48 and of the roller bearing 40 or of the toothed wheel 56 come into contact an operator in this area can control the translation movement 16 via the operating element 10 in a particularly effective manner.
  • dashed lines show courses of translational movements which would produce pencil-shaped eccentric elements which are arranged either in the position of the contact point 30 at a rotational position of 0 ° or in the position of the contact point 30 at a rotational position of 90 ° ,
  • the switching device is characterized by an advantageous insensitivity to inaccurate Ein- settings of the rotation angle 32 by the operator.
  • Embodiments of the invention are also conceivable in which a switching spring is arranged on a contact piece which can be displaced axially with a switching element and is not connected to a housing of the handheld power tool.

Landscapes

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

Abstract

La présente invention concerne un dispositif de commutation comprenant un élément de commande (10) monté rotatif et un élément excentrique (12) qui sert à convertir un mouvement de rotation (14) de l'élément de commande (10) en un mouvement de translation (16) d'un élément de commutation (18), en particulier d'un arbre de commande d'une machine-outil manuelle. Selon l'invention, la forme de l'élément excentrique (12) se différencie sensiblement de celle d'une tige.
EP05763069A 2004-09-17 2005-07-06 Dispositif de commutation Withdrawn EP1838500A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004045117A DE102004045117A1 (de) 2004-09-17 2004-09-17 Schaltvorrichtung
PCT/EP2005/053221 WO2006029916A1 (fr) 2004-09-17 2005-07-06 Dispositif de commutation

Publications (1)

Publication Number Publication Date
EP1838500A1 true EP1838500A1 (fr) 2007-10-03

Family

ID=35033312

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05763069A Withdrawn EP1838500A1 (fr) 2004-09-17 2005-07-06 Dispositif de commutation

Country Status (5)

Country Link
US (1) US7395872B2 (fr)
EP (1) EP1838500A1 (fr)
CN (1) CN101022925B (fr)
DE (1) DE102004045117A1 (fr)
WO (1) WO2006029916A1 (fr)

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JP4812471B2 (ja) * 2006-03-09 2011-11-09 株式会社マキタ 作業工具
DE102006056853A1 (de) * 2006-12-01 2008-06-05 Robert Bosch Gmbh Handwerkzeugmaschine
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JP4981506B2 (ja) * 2007-04-12 2012-07-25 株式会社マキタ ハンマードリル
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US8251156B2 (en) * 2008-10-30 2012-08-28 Black & Decker Inc. Compliant shifting mechanism for right angle drill
DE102008056880A1 (de) * 2008-11-12 2010-05-20 Protool Gmbh Handwerkzeugmaschine mit einem in einem Getriebegehäuse angeordneten schaltbaren Schaltgetriebe
DE102008054786A1 (de) * 2008-12-17 2010-07-01 Hilti Aktiengesellschaft Drehschalter
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US20110194796A1 (en) * 2010-02-05 2011-08-11 Schaeffler Technologies Gmbh & Co. Kg Angled Bore Bearing
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DE102010062099A1 (de) * 2010-11-29 2012-05-31 Robert Bosch Gmbh Hammerschlagwerk
DE102010062094A1 (de) * 2010-11-29 2012-05-31 Robert Bosch Gmbh Hammerschlagwerk
EP2809470B1 (fr) 2012-02-03 2020-01-15 Milwaukee Electric Tool Corporation Marteau rotatif
US9630307B2 (en) * 2012-08-22 2017-04-25 Milwaukee Electric Tool Corporation Rotary hammer
US10328560B2 (en) * 2015-02-23 2019-06-25 Brian Romagnoli Multi-mode drive mechanisms and tools incorporating the same
CN104802137B (zh) * 2015-05-14 2016-05-11 浙江海王电器有限公司 一种电锤
US10518399B2 (en) * 2015-09-30 2019-12-31 Chervon (Hk) Limited Clutch device and power tool with clutch device
CN106553160B (zh) * 2015-09-30 2019-08-06 南京德朔实业有限公司 离合装置以及具有该离合装置的电锤
CN107457747B (zh) * 2016-06-06 2020-05-26 冠亿齿轮股份有限公司 气动工具的转向切换及换位使用装置
EP4190496A4 (fr) * 2020-09-25 2024-02-21 Nanjing Chervon Industry Co., Ltd. Marteau électrique

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Also Published As

Publication number Publication date
US7395872B2 (en) 2008-07-08
US20070102174A1 (en) 2007-05-10
WO2006029916A1 (fr) 2006-03-23
CN101022925B (zh) 2010-09-29
CN101022925A (zh) 2007-08-22
DE102004045117A1 (de) 2006-03-23

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