EP4201595A1 - Outil électrique portatif - Google Patents

Outil électrique portatif Download PDF

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Publication number
EP4201595A1
EP4201595A1 EP22214625.0A EP22214625A EP4201595A1 EP 4201595 A1 EP4201595 A1 EP 4201595A1 EP 22214625 A EP22214625 A EP 22214625A EP 4201595 A1 EP4201595 A1 EP 4201595A1
Authority
EP
European Patent Office
Prior art keywords
unit
hand tool
coupling element
projection
gear
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.)
Pending
Application number
EP22214625.0A
Other languages
German (de)
English (en)
Inventor
Simon Frohnauer
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.)
Einhell Germany AG
Original Assignee
Einhell Germany AG
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 Einhell Germany AG filed Critical Einhell Germany AG
Publication of EP4201595A1 publication Critical patent/EP4201595A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/0064—Means for adjusting screwing depth
    • 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 present invention relates to an electric hand tool, in particular a drywall screwdriver, having the features of independent claim 1.
  • Drywall screwdrivers are typically used to join or fasten two materials such as plasterboard, wood or metal. Drywall screwdrivers are usually characterized by their high speeds and the adjustable depth stop, so that a large number of screws can be countersunk within a very short time with the same screwing depth.
  • Electric hand tools are known to be equipped with a drive unit, by means of which an insert receptacle can be driven in rotation about an axis of rotation via a gear unit and via a clutch unit.
  • a drive unit by means of which an insert receptacle can be driven in rotation about an axis of rotation via a gear unit and via a clutch unit.
  • the torques of the drive unit are not transmitted satisfactorily to the insert receptacle, which ultimately leads to a poorer result in the screw connection.
  • the object of the present invention is therefore to provide an electric hand tool in which the interaction between the gear unit and the clutch unit has been optimized in order to achieve better torque transmission and thus also a better result in the screw connection.
  • the invention relates to an electric hand tool, in particular a drywall screwdriver.
  • the electric hand tool has a housing with a drive unit arranged therein, which has a motor shaft about an axis of rotation drives rotating.
  • the housing of the hand-held power tool can include a drive housing and a gear housing.
  • the drive unit of the electric hand tool can be formed by an electric motor.
  • the electric motor can be a brushless electric motor or a brushed motor.
  • the electric hand tool has a gear unit mechanically coupled to the drive unit and an insert receptacle mechanically coupled to the gear unit for receiving a tool insert.
  • a bit insert or the like can be conceivable as a tool insert.
  • the insert receptacle can have an at least essentially cylindrical receiving space which is open on a narrow side at the front and into which the respective tool insert can be inserted or inserted from outside the hand tool.
  • the electric hand tool has a clutch unit.
  • the clutch unit is intended to couple and/or decouple a torque of the transmission unit to the insert receptacle.
  • the clutch unit can be coupled with appropriate pressure on the hand tool, which is applied, for example, by an operator of the electric hand tool when screwing a screw into a material, so that a torque of the gear unit can be transmitted to the insert receptacle.
  • the tool insert inserted into the insert receptacle can be rotated by the drive unit by means of the gear unit about an axis of rotation running longitudinally centrally through the insert receptacle.
  • the axis of rotation of the insert receptacle can preferably run in alignment with or collinear with the axis of rotation of the motor shaft driven in rotation by the drive unit.
  • the coupling unit can be uncoupled again, so that the transmission of torque from the gear unit to the insert receptacle is prevented.
  • the gear unit is formed by a planetary gear, the planetary gear comprising a planet carrier which has a projection on the side facing the clutch unit with driver elements provided thereon.
  • the clutch unit comprises a clutch element with at least one recess in which the projection of the planetary carrier engages with the driver elements provided thereon.
  • the planetary carrier can interact directly and without any further components with the clutch element, so that the torque of the drive unit can ultimately also be transmitted directly, quickly and reliably to the insert receptacle when the clutch unit is coupled.
  • a positive connection can be formed by the engagement of the projection of the planetary carrier in the recess of the coupling element.
  • further mechanical connecting components or the like can be dispensed with.
  • the planet carrier and the coupling element consist of different components. This can be particularly advantageous in that the entire assembly does not have to be replaced in the event of wear and/or maintenance work, but it can be sufficient to merely replace the affected component. This saves resources and at the same time the costs for repairs can be kept as low as possible.
  • the at least one recess of the coupling element corresponds to an outer contour of the projection arranged on the planet carrier with the driver elements provided thereon.
  • the recess can be shaped in such a way that the coupling element can be completely guided, in particular plugged, onto the projection.
  • the projection of the planetary carrier can protrude axially through or beyond the recess of the coupling element in such a way that the Projection with the coupling element arranged thereon protrudes axially or protrudes.
  • the projection may have a cylinder shape, a cone shape, a pyramid shape, or the like.
  • the projection of the planetary carrier can be hollow at least in sections.
  • the projection can include and provide a receptacle at the front, i.e. in the direction of the coupling unit, into which the tool receptacle is inserted.
  • the projection of the planetary carrier has at least two driver elements, preferably three or more driver elements.
  • the driver elements can serve to transmit the torque from the drive unit to the coupling element, so that as a result the coupling element is driven to rotate about an axis of rotation running longitudinally centrally through the insert receptacle.
  • the projection of the planetary carrier has an outer lateral surface, from which the driver elements extend radially outwards.
  • the driver elements can extend radially outwards to the outer edge of the planet carrier.
  • the driver elements can have a spherical shape, a cylindrical shape, a cuboid shape or the like.
  • the shapes of the entrainment elements mentioned here should not be understood as limiting.
  • the entrainment elements can have any other shape that makes sense for torque transmission to the clutch element.
  • the planetary carrier with its projection and the driver elements provided thereon can preferably consist of one component or be formed in one piece.
  • the planet carrier can be formed from a milled part, 3D printed part and/or plastic part. This allows the cost of manufacturing and / or production of the planet carrier lower and Consequently, the overall costs for the drywall screwdriver can also be kept low. In addition, such a planetary carrier can also be less susceptible to wear.
  • the driver elements can also be arranged on the outer lateral surface of the projection by means of a non-positive, positive and/or material connection, i.e. the driver elements can be separate components which can be attached accordingly to the outer lateral surface of the projection .
  • the entraining elements can be exchanged individually and when required or when worn.
  • the planetary gear is formed in one stage.
  • the planetary gear can include a sun wheel, which is driven by the motor shaft of the drive unit to rotate directly or indirectly about an axis of rotation.
  • At least three pins can be assigned to the planetary carrier on the side facing the drive unit, with each pin being assigned a planet wheel.
  • the planet gears can be arranged and/or held on the planet carrier via the pins in particular in such a way that the movement of the sun gear can be transmitted to the planet gears.
  • the planet carrier By rotating the planet wheels, the planet carrier as such can in turn be set in rotation.
  • the pins can preferably have a cylindrical shape.
  • the planetary carrier can include indentations on the side facing the drive unit.
  • the pegs can be inserted into the indentations, i.e. the indentations can have a cross section which corresponds to the cross section of the pegs.
  • the depressions can be open on one side, ie the depressions can protrude at least in sections into the planetary carrier.
  • the depressions can be designed in such a way that they can accommodate the pins at least in sections, preferably in a clamping manner.
  • the depressions can be formed by a blind hole.
  • the indentations can also be designed to be continuous, so that the indentations are each designed to be open on both sides; i.e. the indentations can protrude axially completely through the planet carrier, which means that the indentations are each formed, for example, as a through hole.
  • the pins can be held in a clamped manner by the respective indentations.
  • the at least three pins are permanently or permanently assigned to the planet carrier.
  • Material, non-positive and/or form-fitting connections between the pins and the planetary carrier can be suitable for this, for example.
  • the planet carrier and the pins can also be formed from one component, in particular in one piece.
  • the planetary gear can be supported by a ring gear, with the ring gear being arranged in the outer housing of the electric hand tool so that it is essentially non-rotatable or non-rotatable.
  • the ring gear has at least one or more knobs on its outer circumference. The knobs can be in engagement with an inner lateral surface of the housing.
  • the ring gear can have internal teeth along which the planetary gears can rotate.
  • the advantage of the single-stage planetary gear is that the electric hand tool can be made compact. Due to the load distribution over several planetary carriers, it is also possible that, despite the compact design, high torques can be transferred to the insert holder. In addition, a change in the transmission ratio can be made possible by the planetary gear without separating the power flow.
  • the electric hand tool can comprise a screw-in depth limiting element, via which a screw-in depth can be adjusted.
  • the screw-in depth limiting element can be brought into different positions by the operator of the electric hand tool in order to limit a screw-in depth, for example, to a value corresponding to the respective position.
  • the screw-in depth limiting element can be equipped with an internal thread and can be rotated about it.
  • the screw-in depth limiting element can also provide a detent with a number of detent positions in order to set the screw-in depth.
  • the coupling element is largely flat on the side facing the planet carrier, while it has drivers on the side facing away from the planet carrier.
  • the drivers can, for example, extend axially from the side facing away from the planet carrier and can be designed, for example, as knobs, elevations, or the like.
  • the coupling unit can include additional coupling elements, in particular a further coupling element and a coupling element fixed to the insert receptacle.
  • the further coupling element can have first drivers on the side facing the coupling element, which are designed to correspond to the drivers of the coupling element.
  • the further coupling element can in particular be designed to be axially movable along the insert receptacle and the projection of the planet carrier.
  • the additional clutch element can rotate about an axis of rotation that runs collinear with the axis of rotation of the planet carrier or the clutch element.
  • the driver of the coupling element and the first driver of the further coupling element can engage or couple in particular when an operator presses the drywall screwdriver axially against a workpiece to countersink or screw in a fastener.
  • the further coupling element can have second drivers.
  • the fixed coupling element can also have further drivers on the side facing the further coupling element, which are designed to correspond to the second drivers of the further coupling element.
  • the further coupling element and the fixed coupling element can in particular come into engagement when the coupling unit is decoupled.
  • the clutch unit is mounted at least in sections by a bearing unit.
  • the bearing unit can be formed by a ball bearing or the like.
  • the storage unit can be used in particular to rotatably support the coupling element.
  • the figure 1 shows a perspective view of an electric hand tool 10, which is formed by a battery-powered drywall screwdriver 12.
  • the drywall screwdriver 12 has a housing 14 which is formed, for example, from a plastic material or at least in some areas from a plastic material and/or metal material.
  • the housing 14 is composed of a drive housing 16 with a holding and/or grip area 22 and a gear housing 20 .
  • the drive housing 16 consists of two shell-like housing halves 18, 18', which are connected to one another via latching and/or screw and/or adhesive connections, not shown here.
  • the transmission housing 20 is attached to one end of the drive housing 16 at the front.
  • the holding and/or grip area 22 is ergonomically shaped so that an operator can hold the drywall screwdriver 12 comfortably. To increase the holding comfort, the holding and/or grip area 22 is equipped with a soft grip, at least in some areas.
  • a battery pack receptacle 28 is provided at the end of the holding and/or grip area 22, to which a battery pack 30 can be mechanically coupled via a corresponding battery pack interface, not shown here.
  • the battery pack 30 is in particular a lithium-ion battery pack which is designed as a replaceable or exchangeable battery pack 30 .
  • the battery pack 30 is designed as a replaceable battery pack or as a system battery pack, which means that the battery pack 30 is used not only to supply electrical energy to the drywall screwdriver 12, but also to supply electrical energy to various electrical devices, for example a power tool, electrical garden device, household appliance, vehicle or the like can be.
  • the battery pack 30 has a nominal voltage between about 12 volts and about 40 volts. A preferred nominal voltage of the battery pack 30 is 18 volts.
  • an actuating unit 24 in the form of a single or
  • Off switch 26 provided. By actuating the on/off switch 26, the drywall screwdriver 12 can be supplied with electrical energy, which is made available by the battery pack 30, and can therefore also be used.
  • the drywall screwdriver 12 also includes a screw-in depth limiting element (not shown), via which a screw-in depth can be adjusted.
  • the screw-in depth limiting element can be brought into different positions by the operator of the drywall screwdriver 12 in order to limit a screw-in depth, for example, to a value corresponding to the respective position.
  • the screw-in depth limiting element can be equipped with an internal thread and can be rotated about it.
  • the screw-in depth limiting element can also provide a detent with a number of detent positions in order to set the screw-in depth.
  • the figure 2 shows in a schematic sectional side view an area of the in figure 1 illustrated electric hand tool 10, while the Figures 3A and 3B details individual components of the in figure 2 show the sectional view shown.
  • the drywall screwdriver 12 has a housing 14 with a drive housing 16 and a walking gear housing 20 . Inside the housing 14, in particular inside the drive housing 16, a drive unit 32 is provided inside the housing 14, in particular inside the drive housing 16, a drive unit 32 is provided inside the housing 14, in particular inside the drive housing 16, a drive unit 32 is provided inside the housing 14, in particular inside the drive housing 16, a drive unit 32 is provided inside the housing 14, in particular inside the drive housing 16, a drive unit 32 is provided inside the housing 14, in particular inside the drive housing 16, a drive unit 32 is provided inside the housing 14, in particular inside the drive housing 16, a drive unit 32 is provided inside the housing 14, in particular inside the drive housing 16, a drive unit 32 is provided inside the housing 14, in particular inside the drive housing 16, a drive unit 32 is provided inside the housing 14, in particular inside the drive housing 16, a drive unit 32 is provided inside the housing 14, in particular inside the drive housing 16, a drive unit 32 is provided inside the housing 14, in particular inside the drive housing 16, a drive unit 32 is provided inside the housing 14, in particular inside the drive housing 16,
  • a fan wheel 36 which can be driven by the motor shaft 34 to rotate about an axis of rotation.
  • the fan wheel 36 serves in particular to cool the components or assemblies in the drive housing 16 and in the gear housing 20 by means of an air flow.
  • a further drive shaft 38 is provided as an extension of the motor shaft 34 .
  • the drive shaft 38 is coupled to the end of the motor shaft 34 by means of suitable non-positive and/or positive connections.
  • the drywall screwdriver 12 has a gear unit 40 mechanically coupled to the drive unit 32 and an insert receptacle 78 mechanically coupled to the gear unit 40 for receiving a tool insert (not shown).
  • the tool insert can be formed, for example, by a bit insert or the like.
  • the insert receptacle 78 has an at least essentially cylindrical receiving space that is open on a narrow side at the front and into which the respective tool insert can be inserted or inserted from outside the electric hand tool 10 .
  • the drywall screwdriver 12 includes a clutch unit 58 which is provided for coupling or decoupling a torque of the transmission unit 40 to the insert receptacle 78 .
  • the gear unit 40 is formed by a single-stage planetary gear 42 .
  • the planetary gear 42 includes a sun gear 44 which is assigned to the drive shaft 38 .
  • the sun wheel 44 is preferably attached to the front side of the drive shaft 38 at least in sections.
  • the sun gear 44 is thus driven in rotation about an axis of rotation by the drive shaft 38 .
  • the axis of rotation runs at least approximately in alignment with the axis of rotation of the motor shaft 34 and the insert receptacle 78.
  • the transmission unit 40 further comprises a planetary carrier 46.
  • the planetary carrier 46 has three indentations (not shown) on the side facing the drive unit 32.
  • the depressions are open on both sides, so that a continuous depression is formed.
  • a peg with a cylindrical shape is inserted at least in sections into the depressions, ie the depressions have a cross section which corresponds to the shape of the peg.
  • the pins are preferably clamped in the respective depressions of the planetary carrier 46 .
  • a planet gear 48 is assigned to each pin, with the planet gears 48 being able to rotate about an axis of rotation.
  • the axis of rotation of the planet gears 48 corresponds in each case to a central axis of the pins.
  • the planet gears 48 are each arranged via the journals on the side of the planet carrier 46 facing the drive unit 32 such that the movement of the sun gear 44 is transmitted to the planet gears 48 and thus to the entire planet carrier 46 .
  • the planetary gear 42 itself is supported by a ring gear 50 which is arranged in the housing 14 of the drywall screwdriver 12 in a manner secured against rotation or in a rotationally fixed manner.
  • the protection against torsion or the torsional strength of the ring gear 50 is achieved by knobs that are provided on the outer surface of the ring gear 50 .
  • the nubs can engage in appropriate or corresponding receptacles in the inner lateral surface of the housing 14 and thus generate and/or produce the anti-twist security.
  • Ring gear 50 has internal teeth on the inner lateral surface, along which planetary gears 48 roll and can cause planetary carrier 46 to rotate when they are driven by sun gear 44 .
  • the planetary carrier 46 On the side facing away from the drive unit 32 or on the side facing the clutch unit 58, the planetary carrier 46 has an axially extending projection 52 with driver elements 54 provided thereon.
  • the projection 52 has an at least approximately cylindrical shape.
  • the projection 52 is hollow, so that its free end forms a receptacle 56 .
  • the insert receptacle 78 can be held in the receptacle 56, preferably clamped.
  • the projection 52 of the planet carrier 46 has three driver elements 54 on its outer circumference.
  • the driver elements 54 extend radially outwards to the outer edge of the planet carrier 46.
  • the driver elements 54 are preferably cuboid (cf. Figure 3A and 3B ).
  • the coupling unit 58 includes a coupling element 60 which has a recess 62 .
  • the recess 62 is shaped in such a way that the projection 52 of the planet carrier 46 engages with the driver elements 54 provided thereon.
  • This interaction between planetary carrier 46 and clutch element 60 consequently transmits the torque from drive unit 32 to clutch element 60 when clutch unit 58 is engaged, so that clutch element 60 is driven in rotation via an axis of rotation running longitudinally centrally through insert receptacle 78.
  • the axis of rotation of the insert receptacle 78 preferably runs in alignment or collinear with the axis of rotation of the motor shaft 34.
  • the recess 62 of the coupling element 60 is formed in such a way that the coupling element 60 is pushed or placed and/or held completely onto the projection 52 of the planetary carrier 46 . This takes place in particular in such a way that the projection 52 of the planetary carrier 46 protrudes beyond the coupling element 60 when the coupling element 60 is fully fitted.
  • the coupling unit 58 in particular the coupling element 60, is supported at least in sections by a bearing unit 80.
  • the bearing unit 80 is formed by a ball bearing or the like in order to rotatably support the coupling element 60 .
  • clutch element 60 On the side facing planet carrier 46 , clutch element 60 has a largely flat surface, so that clutch element 60 can also rest completely on planet carrier 46 .
  • the coupling element 60 On the side facing away from the planet carrier 60, the coupling element 60 has three drivers 64, which are formed as knobs or elevations or the like.
  • Coupling unit 58 includes additional coupling elements, in particular a further coupling element 66 and a coupling element 68 fixed to insert receptacle 78.
  • further coupling element 66 On the side facing coupling element 60, further coupling element 66 has first drivers 70, which at least approximately correspond to drivers 64 of coupling element 60 are trained.
  • the further coupling element 66 On the side facing away from the coupling element 60 or on the side facing the fixed coupling element 68 , the further coupling element 66 has second catches 72 .
  • the second drivers 72 can at least temporarily, in particular in the decoupled state of the coupling unit 58, come into engagement with corresponding additional drivers 74 which are provided on the side of the fixed coupling element 68 facing the additional coupling element 66.
  • a spring element 76 is provided or clamped between the coupling element 60 and the further coupling element 66, via which the coupling element 60 and the further coupling element 66 are held at an axial distance.
  • further coupling element 66 moves axially against a spring force of spring element 76 in the direction of coupling element 60 and engages with its first drivers 70 on coupling element 60.
  • torque is transmitted from the drive unit to the insert receptacle 78 .
  • the further coupling element 66 decouples from the coupling element 60 again and is moved axially in the direction of the fixed coupling element 68 by the spring element 76, so that it engages with the corresponding further drivers 74 of the fixed coupling element 68 comes and consequently a torque transmission to the insert holder 78 is prevented.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Surgical Instruments (AREA)
  • Retarders (AREA)
EP22214625.0A 2021-12-21 2022-12-19 Outil électrique portatif Pending EP4201595A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202021106961.9U DE202021106961U1 (de) 2021-12-21 2021-12-21 Elektrisches Handwerkzeug

Publications (1)

Publication Number Publication Date
EP4201595A1 true EP4201595A1 (fr) 2023-06-28

Family

ID=80222001

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22214625.0A Pending EP4201595A1 (fr) 2021-12-21 2022-12-19 Outil électrique portatif

Country Status (3)

Country Link
EP (1) EP4201595A1 (fr)
AU (1) AU2022291460B2 (fr)
DE (1) DE202021106961U1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2392403A (en) * 2002-08-30 2004-03-03 Johnson Electric Sa Spindle locking device for an electric power tool
EP1815948A2 (fr) * 2006-02-03 2007-08-08 Black & Decker, Inc. Boîtier et boîte de vitesse pour foreuse ou visseuse
US20100043603A1 (en) * 2008-08-25 2010-02-25 Black & Decker Inc. Powered ratchet assembly and related method
DE102011078385A1 (de) * 2011-06-30 2013-01-03 Robert Bosch Gmbh Trockenbauschrauber

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2392403A (en) * 2002-08-30 2004-03-03 Johnson Electric Sa Spindle locking device for an electric power tool
EP1815948A2 (fr) * 2006-02-03 2007-08-08 Black & Decker, Inc. Boîtier et boîte de vitesse pour foreuse ou visseuse
US20100043603A1 (en) * 2008-08-25 2010-02-25 Black & Decker Inc. Powered ratchet assembly and related method
DE102011078385A1 (de) * 2011-06-30 2013-01-03 Robert Bosch Gmbh Trockenbauschrauber

Also Published As

Publication number Publication date
DE202021106961U1 (de) 2022-01-20
AU2022291460A1 (en) 2023-07-06
AU2022291460B2 (en) 2024-03-14

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