EP4126465A1 - Outil électrique portatif - Google Patents

Outil électrique portatif

Info

Publication number
EP4126465A1
EP4126465A1 EP21713691.0A EP21713691A EP4126465A1 EP 4126465 A1 EP4126465 A1 EP 4126465A1 EP 21713691 A EP21713691 A EP 21713691A EP 4126465 A1 EP4126465 A1 EP 4126465A1
Authority
EP
European Patent Office
Prior art keywords
guide tube
main shell
shell
machine tool
cover shell
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
EP21713691.0A
Other languages
German (de)
English (en)
Inventor
Ernst-Rudolf Lübkert
Karin Groth
Uto Plank
Manuel Rosenzweig
Andres Wellmann Jelic
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.)
Hilti AG
Original Assignee
Hilti 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 Hilti AG filed Critical Hilti AG
Publication of EP4126465A1 publication Critical patent/EP4126465A1/fr
Pending 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
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0019—Guide-sleeves
    • 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
    • B25D2250/065—Details regarding assembling of the tool
    • 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
    • B25D2250/121—Housing details
    • 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
    • B25D2250/231—Sleeve details
    • 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
    • B25D2250/361—Use of screws or threaded connections

Definitions

  • the present invention relates to an electric handheld power tool, in particular a hammer drill and / or chisel hammer, with an electropneumatic hammer mechanism, which has a gear housing, a guide tube arranged at least in sections in the gear housing, an exciter piston movable in the axial direction in the guide tube, and an exciter piston coupled to the exciter piston Has connecting rods and an eccentric wheel.
  • the eccentric wheel is coupled on the one hand to the connecting rod and on the other hand is mounted rotatably with respect to the gear housing via a bearing plate of the gear housing.
  • Hand machine tools of the type mentioned are basically known from the prior art.
  • the object of the present invention is to provide a hand-held power tool that is easy to assemble and is preferably designed to be comparatively light.
  • the gear housing is at least divided into a main shell and a cover shell different from the main shell in such a way that the guide tube is braced against the main shell at least in sections by the cover shell.
  • the main shell is made of metal and / or the cover shell is made of plastic.
  • the invention includes the knowledge that in hand power tools of the prior art, the gear housing typically has a fully tubular section into which the guide tube has to be threaded in a complex manner.
  • deep machining - which is typically required in gear housings of the prior art - is particularly costly, since a relatively large machining volume has to be removed in a relatively small bore at a great depth.
  • This material to be removed arises from the requirements of die casting:
  • the core for the long inner diameter must have a certain draft so that it can be removed from the mold. This then typically leads to a certain accumulation of mass, which leads to the formation of shrinkage cavities in the die casting.
  • the cavities mean reduced strength in these areas and are often involved in the propagation of the fracture.
  • the preferred configuration of the cover shell made of plastic enables a significant reduction in weight of the gearbox housing and thus of the entire handheld power tool to be achieved.
  • the invention includes the knowledge that plastic can be provided in exactly the area of the gear housing in which the smallest flow of cooling air is located in the handheld power tool (i.e. in the area in which the lowest heat flow is present during operation), namely above the hammer mechanism.
  • the cover shell extends in the axial direction over the entire length of the guide tube.
  • the striking mechanism area can be easily cleaned and is also comparatively easily accessible for a visual inspection.
  • the main shell and the cover shell are designed to be complementary to one another in the radial direction and at least along the guide tube.
  • the bearing plate is formed in one piece with the main shell.
  • machining in the area of the integrated end shield can be tolerated relatively roughly, as a result of which a machining volume is considerably reduced.
  • the main shell has a concave surface section on which at least one radial rib is formed, which serves to support the guide tube radially and / or axially.
  • the radial rib is integrally formed as a blank and / or is designed without machining.
  • the cover shell has a retaining lip on a side facing the eccentric wheel. It has been found to be advantageous if the course of the retaining lip course follows, at least in sections, preferably completely, a circular path of an eccentric point of the eccentric wheel. It has been found to be advantageous if the eccentric wheel is rotatably mounted in the end shield by means of a bearing journal which is encompassed by the hammer mechanism and which is designed to be non-rotatable with respect to and / or different from the eccentric wheel.
  • the eccentric wheel is designed as an externally toothed gear wheel, which can preferably be rotationally driven by an electric motor comprised by the handheld power tool. It has been found to be advantageous if the cover shell is screwed to the main shell.
  • the main shell can mainly consist of metal.
  • the cover shell can predominantly consist of plastic.
  • FIG. 1 shows a first preferred exemplary embodiment of a striking mechanism of an electric Fland machine tool
  • FIG. 2 shows a second preferred exemplary embodiment of an impact mechanism of an electric flange machine tool in an exploded view.
  • FIG. 1 A first preferred exemplary embodiment of an electropneumatic striking mechanism 70 of an electric handheld power tool 100 (cf. FIG. 2A designed as a chisel hammer, for example) is shown in FIG. 1.
  • the electropneumatic hammer mechanism 70 has a transmission housing 60 and a guide tube 50, the guide tube 50 being arranged at least in sections in the transmission housing 60.
  • the electro-pneumatic hammer mechanism 70 also has an exciter piston 40 which is movable in the axial direction AR in the guide tube 50, a connecting rod 30 coupled to the exciter piston 40, and an eccentric wheel 20.
  • the eccentric wheel 20 is coupled, on the one hand, to the connecting rod 30 and, on the other hand, is mounted rotatably with respect to the gear housing 60 via a bearing plate 10 of the gear housing 60.
  • the eccentric wheel 20 is rotatably mounted in the bearing plate 10 by means of a bearing journal 25 which is encompassed by the hammer mechanism 70 and which is designed to be non-rotatable with respect to and different from the eccentric wheel 20.
  • the eccentric wheel 20 is designed as an externally toothed gear wheel which can be rotationally driven by an electric motor, not shown here.
  • the gear housing 60 is at least divided into a main shell 61 and a cover shell 65 different from the main shell 61 in such a way that the guide tube 50 is braced at least in sections by the cover shell 65 against the main shell 61.
  • the guide tube 50 has at least one annular retaining collar 51 via which the cover shell 65 is braced against the main shell 61, which in turn is also in contact with the retaining collar 51, in the radial direction RR in relation to the guide tube 50.
  • the cover shell 65 is screwed to the main shell 61 (the screws are not shown in FIG. 1).
  • the main shell 61 consists of metal, for example of die-cast aluminum. Since the bearing plate 10 is here advantageously formed in one piece with the main shell 61, it is also made of die-cast aluminum.
  • the cover shell 65 consists of plastic, for example of polybutylene terephthalate (PBT). As a result of the design of the cover shell 65 made of plastic, a significant overall weight reduction of the gear housing 60 is achieved.
  • the cover shell 65 has a retaining lip 67 on a side facing the eccentric wheel 20, the course of which follows, at least in sections, a circular path 23 of an eccentric point 21 of the eccentric wheel 20.
  • the connecting rod 30, the eccentric wheel 20 and the bearing pin 25 are prevented from lifting secured in the radial direction RR (in Fig. 1 upwards).
  • the radial direction RR and the axial direction AR in the context of this description are always related to the guide tube 50, the axial direction AR being oriented coaxially to the direction of movement of the exciter piston 40.
  • a separating cap 71 which is arranged between the main shell 61 and the cover shell 65 and which encompasses at least the eccentric wheel 20 is optionally provided.
  • FIG. 2A A second preferred exemplary embodiment of an electropneumatic hammer mechanism 70 of an electric flange machine tool 100 (cf. FIG. 2A designed as a chisel hammer, for example) is shown - in an exploded view - in FIG. 2B.
  • the essential difference from the exemplary embodiment in FIG. 1 is the omission of the separating cap 71.
  • the cover shell 65 extends in the axial direction AR over the entire length GL of the guide tube 50.
  • the cover shell 65 is made of plastic, for example - a considerable weight saving compared to prior art striking mechanisms is achieved.
  • This also enables the comparatively easy insertion of the guide tube 50 into the main shell 61, as well as facilitating the assembly of the exciter piston 40, connecting rod 30 and eccentric 20, which are also attached from above (ie from the side of the main shell 61 facing away from the end shield 10) by a generous Opening - namely the removed cover shell 65 - can be inserted into the main shell 61.
  • a complicated threading of the connecting rod pin 31 into the eccentric wheel 20 and the subsequent introduction of the exciter piston 40 into the guide tube 50 is significantly facilitated.
  • the main shell 61 and the cover shell 65 are designed to be complementary to one another in the radial direction RR and at least along the guide tube 50.
  • the inner surfaces of the main shell 61 and the cover shell 65 complement each other to form a solid cylinder in which the guide tube 50 is completely accommodated.
  • the plastic bearing cover 65 stiffens the main shell 61 of the gear housing 60 so that the main shell 61 does not lose rigidity due to the screw connections (indicated in FIG. 2B by the screw holes 62).
  • the main shell 61 has a concave surface section 63 on which four radial ribs 64 are formed here, for example, which serve for the radial and axial support of the guide tube 50.
  • the radial rib 64 are advantageously formed as a blank on the main shell 61 and this remains free of machining.

Landscapes

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

Abstract

L'invention se rapporte à un outil électrique portatif, en particulier à un marteau perforateur et/ou à un marteau burineur, comprenant un mécanisme de percussion électropneumatique qui présente un carter d'engrenage, un tube de guidage qui est au moins partiellement disposé dans le carter d'engrenage, un piston d'excitation qui peut être déplacé dans le sens axial dans le tube de guidage, une bielle qui est accouplée au piston d'excitation, et un engrenage à excentrique qui est accouplé à la bielle et qui est monté rotatif par rapport au carter d'engrenage par l'intermédiaire d'un flasque de roulement du carter d'engrenage, le carter d'engrenage étant divisé au moins en une coque principale et en une coque de couvercle qui diffère de la coque principale de telle sorte que le tube de guidage soit au moins en partie précontraint contre la coque principale par la coque de couvercle.
EP21713691.0A 2020-04-03 2021-03-25 Outil électrique portatif Pending EP4126465A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20168023.8A EP3888851A1 (fr) 2020-04-03 2020-04-03 Machine-outil rotative électrique
PCT/EP2021/057773 WO2021198023A1 (fr) 2020-04-03 2021-03-25 Outil électrique portatif

Publications (1)

Publication Number Publication Date
EP4126465A1 true EP4126465A1 (fr) 2023-02-08

Family

ID=70189736

Family Applications (2)

Application Number Title Priority Date Filing Date
EP20168023.8A Withdrawn EP3888851A1 (fr) 2020-04-03 2020-04-03 Machine-outil rotative électrique
EP21713691.0A Pending EP4126465A1 (fr) 2020-04-03 2021-03-25 Outil électrique portatif

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP20168023.8A Withdrawn EP3888851A1 (fr) 2020-04-03 2020-04-03 Machine-outil rotative électrique

Country Status (4)

Country Link
US (1) US12257683B2 (fr)
EP (2) EP3888851A1 (fr)
CN (1) CN115210045B (fr)
WO (1) WO2021198023A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4733007A1 (fr) 2024-10-25 2026-04-29 Hilti Aktiengesellschaft Outil électrique avec parties de boîtier d'un mécanisme de percussion pneumatique connectées de manière amovible

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3161242A (en) * 1960-05-31 1964-12-15 Skil Corp Rotary-hammer devices and tool element accessories therefor
DE1298954B (de) * 1963-04-26 1969-07-03 Impex Essen Vertrieb Schlaggeraet
US4113035A (en) * 1977-04-21 1978-09-12 Licentia Patent-Verwaltungs-G.M.B.H. Hammer drill with drive and percussion elements accommodated in a cylinder
DE4430161A1 (de) * 1994-08-25 1996-02-29 Bosch Gmbh Robert Handwerkzeugmaschine
JP2002283254A (ja) * 2001-01-19 2002-10-03 Hitachi Koki Co Ltd 衝撃工具
DE10261030A1 (de) * 2002-12-24 2004-07-08 Robert Bosch Gmbh Bohrhammer
JP4270887B2 (ja) * 2003-01-10 2009-06-03 株式会社マキタ 電動往復動式工具
JP2008012666A (ja) * 2006-07-01 2008-01-24 Black & Decker Inc ハンマードリル用のシリンダー支持構造体
DE102007000059A1 (de) * 2007-01-31 2008-09-18 Hilti Aktiengesellschaft Handwerkzeugmaschine mit Schwingungstilger
JP5015697B2 (ja) * 2007-08-30 2012-08-29 株式会社マキタ 打撃工具
DE102009002976A1 (de) * 2009-05-11 2010-11-18 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Elektrohandwerkzeugmaschine
DE102009027560A1 (de) * 2009-07-09 2011-01-13 Robert Bosch Gmbh Bohrhammer- und/oder Meißelgerät
DE102013221094A1 (de) * 2013-10-17 2015-04-23 Robert Bosch Gmbh Handwerkzeugmaschinengetriebevorrichtung
JP6223848B2 (ja) * 2014-02-06 2017-11-01 株式会社マキタ 打撃工具
EP3023354A1 (fr) * 2014-11-21 2016-05-25 HILTI Aktiengesellschaft Fermeture d'entraînement de machine-outil manuelle et machine-outil manuelle
JP2016112639A (ja) * 2014-12-15 2016-06-23 株式会社マキタ 動力工具
DE102015205149A1 (de) 2015-03-23 2016-09-29 Robert Bosch Gmbh Handwerkzeugmaschine
JP6987599B2 (ja) * 2017-10-20 2022-01-05 株式会社マキタ 打撃工具
WO2019130982A1 (fr) * 2017-12-28 2019-07-04 工機ホールディングス株式会社 Machine de travail à percussion

Also Published As

Publication number Publication date
CN115210045B (zh) 2025-08-05
EP3888851A1 (fr) 2021-10-06
US12257683B2 (en) 2025-03-25
WO2021198023A1 (fr) 2021-10-07
CN115210045A (zh) 2022-10-18
US20230142832A1 (en) 2023-05-11

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