EP4171884A1 - Mécanisme de percussion électropneumatique - Google Patents

Mécanisme de percussion électropneumatique

Info

Publication number
EP4171884A1
EP4171884A1 EP21732308.8A EP21732308A EP4171884A1 EP 4171884 A1 EP4171884 A1 EP 4171884A1 EP 21732308 A EP21732308 A EP 21732308A EP 4171884 A1 EP4171884 A1 EP 4171884A1
Authority
EP
European Patent Office
Prior art keywords
eccentric wheel
bearing
impact mechanism
collar
gear housing
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
EP21732308.8A
Other languages
German (de)
English (en)
Inventor
Ernst-Rudolf Lübkert
Uto Plank
Karin Groth
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 EP4171884A1 publication Critical patent/EP4171884A1/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
    • 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
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/068—Crank-actuated impulse-driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/06—Composite materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • 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
    • B25D2250/331—Use of bearings

Definitions

  • the present invention relates to an electropneumatic hammer mechanism for an electric hand tool, in particular a hammer drill and / or chisel hammer.
  • the hammer mechanism is equipped with a gear housing, a guide tube arranged at least in sections in the gear housing, an exciter piston movable in the guide tube, a connecting rod coupled to the exciter piston and an eccentric wheel.
  • the eccentric wheel is coupled to the connecting rod on the one hand and is mounted rotatably with respect to the gearbox housing on the other hand.
  • Impact mechanisms of the type mentioned at the outset and hand-held power tools with such impact mechanisms are basically known from the prior art.
  • the striking mechanism has a bearing body on which the eccentric wheel is rotatably mounted by means of a pair of sliding bearings.
  • the bearing shaft is made of plastic or has one. It has been found to be advantageous if the bearing shaft consists of or has a carbon fiber reinforced plastic.
  • the plastic can have one or more of the base polymers polyketone (PK), polyamides (PA), polybutylene terephthalate (PBT), polyphthalamides (PPA), polyphenylene sulfide (PPS) and / or polyetheretherketone (PEEK).
  • the plastic can have one or more additives to improve the sliding properties (in particular in the case of insufficient lubrication and dry running), in particular molybdenum disulfide, polytetrafluoroethylene (PTFE) and / or graphite.
  • the invention includes the knowledge that a bearing shaft which is made of plastic or has such a material is significantly lighter than bearing shafts made of steel known from the prior art.
  • the bearing body is designed as a bearing shaft different from the eccentric wheel. It has been found to be beneficial if that The eccentric wheel has a central bore which is paired with the bearing shaft via a clearance fit and so the plain bearing pairing is formed.
  • the bearing shaft can therefore offer the eccentric wheel a radial running surface.
  • the bearing shaft has a collar which offers an axial sliding surface for the eccentric wheel. It has been found to be advantageous if the bearing shaft is secured in a form-fitting manner against rotation relative to the gear housing by its collar.
  • the collar can have a wave-shaped circumferential toothing which, with corresponding toothing in the end shield of the gearbox housing, provides a form fit, based on the direction of rotation of the bearing shaft.
  • the eccentric wheel is in direct contact with the collar. Alternatively or additionally, the eccentric wheel can be secured against lifting off the connecting rod in the axial direction by the collar.
  • the bearing shaft is paired with the gear housing on a side of the collar facing the eccentric wheel via a clearance fit.
  • the bearing shaft can be secured on a side of the collar facing the eccentric wheel by a screw connection in the axial direction in the transmission housing.
  • the bearing body can be configured as a bearing journal and / or in one piece with the gear housing. It has been found to be advantageous if the sliding bearing pairing has a sliding bearing bushing arranged between the eccentric wheel and the bearing journal. It has also been found to be advantageous if the plain bearing bush is pressed into the eccentric wheel.
  • the bearing journal has a bevel that corresponds to a bevel of the plain bearing bush.
  • a sliding layer for example a PTFE sliding layer, can be provided between the bearing plate and the eccentric wheel.
  • the gear housing can have a closure cover which has at least one retaining lip on a side facing the eccentric wheel. It has been found to be advantageous if a course of the retaining lip follows, at least in sections, preferably completely, a circular path of an eccentric point of the eccentric wheel.
  • a plurality of retaining lips, each configured concentrically to one another, can be provided. The retaining lips can have different diameters from one another. In this way, the connecting rod and the eccentric wheel are preferably secured against lifting in the axial direction.
  • the eccentric wheel can preferably be designed as an externally toothed gear wheel, which can preferably be rotationally driven by an electric motor comprised by a handheld power tool.
  • the object is also achieved by an electric hand machine tool, in particular a hammer drill and / or chisel hammer, which is equipped with an impact mechanism of the type described above.
  • FIG. 1 shows a first embodiment of a striking mechanism according to the invention
  • FIG. 2 shows a second exemplary embodiment of a striking mechanism according to the invention.
  • FIG. 1A A first preferred exemplary embodiment of an electropneumatic hammer mechanism 70 of an electric handheld power tool 100 (cf. FIG. 1B designed as a chisel hammer, for example) is shown in FIG. 1A.
  • 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 electropneumatic hammer mechanism 70 also has an exciter piston 40 that is movable 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 rotatably supported with respect to the transmission housing 60 via a bearing plate 10 of the transmission housing 60.
  • the end shield 10 is integrated into the gear housing 60.
  • 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 striking mechanism 70 has a bearing body 25 on which the eccentric wheel 20 is rotatably mounted by means of a pair of sliding bearings 28.
  • the bearing body 25 is designed as a bearing shaft 26 different from the eccentric wheel 20.
  • the bearing shaft 26 consists, for example, of a carbon fiber-reinforced PEEK plastic that has been provided with polytetrafluoroethylene (PTFE) to improve the tribological properties.
  • the eccentric wheel 20 has a central bore 22 which is paired with the bearing shaft 26 via a clearance fit SP, as a result of which the sliding bearing pairing 28 is formed.
  • the bearing shaft 26 has a collar 27 which extends in the radial direction RR.
  • the collar 27 provides an axial sliding surface AG for the eccentric wheel 20.
  • the bearing shaft 26 is secured by its collar 27 in a form-fitting manner against rotation relative to the gear housing 60, more precisely relative to the bearing plate 10 of the gear housing 60.
  • the form fit is provided by a wave-shaped circumferential toothing 27 ‘on the collar 27.
  • the eccentric wheel 20 is in direct contact with the collar 27.
  • the eccentric wheel 20 is secured against lifting off the connecting rod 30 (downward in FIG. 1A) by the collar 27 in the axial direction AR.
  • the bearing shaft 26 is paired with the gear housing 60, more precisely with the end shield 10 of the gear housing 60, via a shield clearance fit SS.
  • a screw connection 11 secures the bearing shaft 26 in the axial direction AR in the gear housing 60.
  • the gear housing 60 has a closure cover 65 which, on a side facing the eccentric wheel 20, has four retaining lips 67, the courses of which - directly or concentrically - follow a circular path 23 of an eccentric point 21 of the eccentric wheel 20. In this way, the connecting rod 30 and the eccentric wheel 20 are secured against lifting in the axial direction AR (upward in FIG. 1A).
  • 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. 1B A second preferred exemplary embodiment of an electropneumatic striking mechanism 70 of an electric handheld power tool 100 (cf. FIG. 1B embodied as a chisel hammer, for example) is shown in FIG. 2.
  • the electropneumatic hammer mechanism 70 also 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 that is movable 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 rotatably supported with respect to the transmission housing 60 via a bearing plate 10 of the transmission housing 60.
  • the end shield 10 is integrated into the gear housing 60.
  • the eccentric wheel 20 is designed as an externally toothed gearwheel which is rotationally driven by an electric motor, not shown here, of the handheld power tool 100.
  • a sliding bearing pairing 28 which is located between the eccentric wheel 20 and the bearing journal 24, has a sliding bearing bushing 29.
  • the plain bearing bush 29 is pressed into a central bore 22 of the eccentric wheel 20.
  • a PTFE sliding layer 12 is provided between the end shield 10 and the eccentric wheel 20.
  • the gear housing 60 also has a closure cover 65 which, on a side facing the eccentric wheel 20, has a retaining lip 67, the course of which follows a circular path 23 of an eccentric point 21 of the eccentric wheel 20.
  • a closure cover 65 which, on a side facing the eccentric wheel 20, has a retaining lip 67, the course of which follows a circular path 23 of an eccentric point 21 of the eccentric wheel 20.
  • three further concentric retaining lips 67 are provided. In this way, the connecting rod 30 and the eccentric wheel 20 are secured against lifting in the axial direction AR (upward in FIG. 2).

Landscapes

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

Abstract

L'invention concerne un mécanisme de percussion électropneumatique pour un outil électrique portatif, en particulier un marteau perforateur et/ou marteau burineur, le mécanisme de percussion comprenant un carter d'engrenage, un tube de guidage disposé au moins partiellement dans le carter d'engrenage, un piston d'excitation qui peut être déplacé axialement dans le tube de guidage, une tige de liaison qui est accouplée au piston d'excitation, et un engrenage excentrique qui est accouplé à la tige de liaison et est monté rotatif par rapport au carter d'engrenage, le mécanisme de percussion comportant un corps de palier sur lequel l'engrenage excentrique est monté rotatif au moyen d'une paire de paliers coulissants.
EP21732308.8A 2020-06-29 2021-06-15 Mécanisme de percussion électropneumatique Pending EP4171884A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20182763.1A EP3932622A1 (fr) 2020-06-29 2020-06-29 Mécanisme à percussion électropneumatique
PCT/EP2021/066032 WO2022002575A1 (fr) 2020-06-29 2021-06-15 Mécanisme de percussion électropneumatique

Publications (1)

Publication Number Publication Date
EP4171884A1 true EP4171884A1 (fr) 2023-05-03

Family

ID=71266423

Family Applications (2)

Application Number Title Priority Date Filing Date
EP20182763.1A Withdrawn EP3932622A1 (fr) 2020-06-29 2020-06-29 Mécanisme à percussion électropneumatique
EP21732308.8A Pending EP4171884A1 (fr) 2020-06-29 2021-06-15 Mécanisme de percussion électropneumatique

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP20182763.1A Withdrawn EP3932622A1 (fr) 2020-06-29 2020-06-29 Mécanisme à percussion électropneumatique

Country Status (4)

Country Link
US (1) US12151351B2 (fr)
EP (2) EP3932622A1 (fr)
CN (1) CN115666865B (fr)
WO (1) WO2022002575A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3901498A1 (fr) * 2020-04-21 2021-10-27 Hilti Aktiengesellschaft Mécanisme de percussion électropneumatique
US12417297B2 (en) 2023-06-22 2025-09-16 International Business Machines Corporation Securing sensitive data in a container management system

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2605998C3 (de) * 1976-02-14 1981-12-24 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Bohrhammer mit in einem Zylinder untergebrachten Antriebs- und Schlagelementen
DE2743153A1 (de) * 1977-09-24 1979-04-05 Impex Essen Vertrieb Kurbeltrieb fuer elektromotorisch angetriebene handschlaggeraete
EP0698744A4 (fr) * 1994-03-10 1996-07-31 Enomoto Co Ltd Element coulissant
DE10009705A1 (de) * 2000-02-29 2001-08-30 Gerstweiler Herbert Auf Achse geführtes Schlaggerät
DE102004025951A1 (de) * 2004-05-27 2005-12-22 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Bohr- und/oder Schlaghammer
DE102004046627A1 (de) * 2004-09-25 2006-03-30 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Bohr- und/oder Schlaghammer
JP4887492B2 (ja) * 2006-05-30 2012-02-29 国立大学法人静岡大学 非接触支持装置
JP5015697B2 (ja) * 2007-08-30 2012-08-29 株式会社マキタ 打撃工具
JP5356097B2 (ja) * 2009-04-01 2013-12-04 株式会社マキタ 打撃工具
CN102248520B (zh) * 2011-06-14 2013-07-10 常熟市迅达粉末冶金有限公司 一种功能切换装置
RU2012140965A (ru) * 2011-10-04 2014-03-27 Макита Корпорейшн Электроинструмент (варианты)
CN206000878U (zh) * 2016-07-29 2017-03-08 东莞市金隆机械设备有限公司 一种油漆烘干箱用轴承组件
CN215617869U (zh) * 2018-04-04 2022-01-25 米沃奇电动工具公司 一种适于向工具头施加轴向冲击的旋转锤
CN210686872U (zh) * 2019-08-16 2020-06-05 江苏金泰新减速机有限公司 一种可调式精密行星齿轮减速机

Also Published As

Publication number Publication date
CN115666865B (zh) 2025-07-22
EP3932622A1 (fr) 2022-01-05
US12151351B2 (en) 2024-11-26
US20230311288A1 (en) 2023-10-05
CN115666865A (zh) 2023-01-31
WO2022002575A1 (fr) 2022-01-06

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