EP4139592A1 - Mécanisme de percussion électropneumatique - Google Patents

Mécanisme de percussion électropneumatique

Info

Publication number
EP4139592A1
EP4139592A1 EP21717073.7A EP21717073A EP4139592A1 EP 4139592 A1 EP4139592 A1 EP 4139592A1 EP 21717073 A EP21717073 A EP 21717073A EP 4139592 A1 EP4139592 A1 EP 4139592A1
Authority
EP
European Patent Office
Prior art keywords
eccentric wheel
connecting rod
separating element
impact mechanism
hammer
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
EP21717073.7A
Other languages
German (de)
English (en)
Inventor
Ernst-Rudolf Lübkert
Uto Plank
Jochen Erhardt
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 EP4139592A1 publication Critical patent/EP4139592A1/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
    • B25D17/26—Lubricating
    • 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
    • B25D2217/0057—Details related to cleaning or cooling the tool or workpiece
    • B25D2217/0065—Use of dust covers
    • 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
    • B25D2250/345—Use of o-rings
    • 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
    • B25D2250/365—Use of seals

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 designed as an externally toothed gear.
  • the eccentric wheel is coupled on the one hand to the connecting rod and on the other hand is rotatably mounted with respect to the transmission housing.
  • Impact mechanisms of the type mentioned at the outset and hand-held machine tools with such impact mechanisms are basically known from the prior art.
  • an axial gap is provided between an eccentric wheel surface facing the connecting rod and a connecting rod surface facing the eccentric wheel.
  • the axial gap is preferably used to optionally accommodate a lubricating space separating element, or at least a part thereof. It has been found to be advantageous if a radial distance is provided between a contact point farthest away from the axis of rotation in the radial direction, which is between the connecting rod and the eccentric wheel, and the root circle of the eccentric wheel designed as an externally toothed gear.
  • the radial distance is preferably used to optionally accommodate a / the lubricating space separating element, or at least a part thereof.
  • the invention includes the knowledge that by optionally introducing a lubricating space separating element, for example in markets where a lubricating space separation is not required, the lubricating space separating element can be saved. In markets where lubrication space separation is required, a lubrication space separation element with any seals can be installed.
  • a lubrication space separation element with any seals can be installed.
  • the hand-held power tools and / or the hammer mechanisms are delivered without a lubrication space separating element when they are first delivered and, depending on the type of use and wear, the lubrication space separating element is introduced in the event of servicing.
  • the lubrication space separating element is introduced in the event of servicing.
  • the axial gap based on the axis of rotation of the eccentric wheel in the axial direction, is at least 20 percent as large as the thickness of the eccentric wheel in the axial direction. It has been found to be advantageous if the axial gap is at least 5 mm. It has been found to be advantageous for the radial distance between the contact point and the root circle to be at least 5 percent of a root circle diameter (FD) of the root circle. It has been found to be advantageous if the radial distance is at least 5 mm.
  • FD root circle diameter
  • the hammer mechanism has a lubricating space separating element which is received in the axial gap and / or in the radial distance. It has been found to be advantageous if the lubricating space separating element has an annular sealing collar with a dynamic sealing ring which is arranged coaxially to the axis of rotation and is pressed against the radial distance.
  • the lubricating space separating element has an end sealing collar which seals the eccentric wheel at least in sections against a housing wall.
  • the front sealing collar can have a static sealing ring which is arranged coaxially to the axis of rotation and is pressed against an inner edge of the gear unit.
  • the lubricating space separating element has a sleeve-shaped sealing chamber for receiving a pinion of an electric motor. It has been found to be advantageous if the annular sealing collar, the front sealing collar and the sealing chamber are formed in one piece with one another.
  • the lubricating space separating element is free from axial support loads that are brought about directly or indirectly by the connecting rod.
  • a height of the annular sealing collar in the axial direction is less than the axial gap.
  • the cover shell has, on a side facing the eccentric wheel, a retaining lip for securing the connecting rod in the axial direction.
  • a profile of the retaining lip preferably follows, at least in sections, 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 be separated from each other have different diameters.
  • the closure cover can have a support collar which extends in the axial direction and rests on the face sealing collar in the axial direction.
  • an electric handheld power tool in particular a hammer drill and / or chisel hammer, with a hammer mechanism as described above. It has been found to be advantageous if the handheld power tool has an electric motor with a pinion for directly driving the eccentric wheel via its external toothing.
  • the pinion and the external toothing of the eccentric wheel can be located in an engine lubrication chamber.
  • the connecting rod and / or a surface portion of the eccentric wheel facing the cover shell are accommodated in a hammer mechanism lubrication space that is hydraulically separated from the engine lubrication space.
  • a lubricating space separating element with an annular sealing collar, a face sealing collar and a sealing chamber, which are formed in one piece with one another.
  • Figure 1 shows a preferred embodiment of a striking mechanism according to the invention.
  • FIG. 1 A first preferred exemplary embodiment of an electropneumatic hammer mechanism 70 of an electric handheld power tool 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 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 supported by a bearing plate 10 of the transmission housing 60 so that it can rotate about an axis of rotation DA with respect to the transmission housing 60.
  • the end shield 10 is integrated into the gear housing 60.
  • the eccentric wheel 20 is rotatably mounted on a bearing body 25 by means of a pair of sliding bearings 28.
  • the bearing body 25 is inserted non-rotatably into the bearing plate 10.
  • the eccentric wheel 20 is designed as an externally toothed 29 gear wheel, which can be rotationally driven by an electric motor 90.
  • the electric motor 90 has a pinion 91 which is paired with the external toothing 29.
  • an axial gap AS is provided between an eccentric wheel surface EO facing the connecting rod 30 and a connecting rod surface PO facing the eccentric gear 20.
  • the axial gap AS based on the axis of rotation DA of the eccentric wheel 20 in the axial direction AR, is, for example, about 30 percent as large as a thickness DE of the eccentric wheel 20 in the axial direction AR.
  • a radial distance RA is provided between a contact point KP which is farthest away from the axis of rotation DA in the radial direction RR and which exists between the connecting rod 30 and the eccentric wheel 20, and the root circle FK of the external toothing 29 of the eccentric wheel 20 .
  • the radial distance RA between the contact point KP and the root circle FK is, for example, 5 percent of a root circle diameter FD of the root circle FK of the eccentric wheel.
  • the connecting rod 30 has a connecting rod pin 31 which engages in the eccentric wheel 20.
  • the contact point KP is located at the transition from the connecting rod pin 31 to the eccentric wheel 20.
  • the striking mechanism 70 has an optionally introduced lubricating chamber separating element 90 within the gear housing 60, which realizes a hydraulic separation between the engine lubricating chamber 92 and the striking mechanism lubricating chamber 62.
  • the pinion 91 and the external toothing 29 of the eccentric wheel 20 are located in the engine lubrication chamber 92.
  • the connecting rod 30 and a wheel surface 26 facing the cover shell 65 are in one Enclosed hammer mechanism lubrication chamber 62, which is hydraulically separated from engine lubrication chamber 92.
  • the lubricating space separating element 80 itself has an annular sealing collar 81, a front sealing collar 83 and a sealing chamber 85.
  • the annular sealing collar 81, the front sealing collar 83 and the sealing chamber 85 are formed in one piece with one another.
  • the lubricating space separating element 80 consists, for example, of plastic.
  • the annular sealing collar 81 serves to seal the eccentric wheel 20 on its side facing the cover shell 65.
  • the annular sealing collar 81 based on the axial direction AR, is accommodated in the axial gap AS between the connecting rod 30 and the eccentric wheel 20.
  • the annular sealing collar 81 rests on the radial distance RA in relation to the radial direction RR.
  • Axial gap AS and radial distance RA are thus occupied by one and the same separating element in the form of annular sealing collar 81.
  • the ring sealing collar 81 is equipped with a dynamic sealing ring 82 which is arranged coaxially to the axis of rotation DA and is pressed against the radial distance RA.
  • the end sealing collar 83 serves to seal the eccentric wheel 20 at least in sections against a housing wall 68.
  • the end sealing collar 83 has a static sealing ring 84 for this purpose, which is pressed against the housing wall 68 in the axial direction AR.
  • the static sealing ring 84 in the embodiment of FIG. 1A is arranged in the area of the eccentric wheel 20 coaxially to the axis of rotation DA. In the area of the pinion 91, the static sealing ring 84 is also pressed against the housing wall 68 in the axial direction AR. In this area, however, the sealing ring 84 extends coaxially to the axis of rotation RO of the pinion 91.
  • the sleeve-shaped sealing chamber 85 of the lubricating space separating element 80 finally serves to accommodate the pinion 91 of the electric motor 90.
  • the gear housing 60 is closed on an upper side 61 - from here the connecting rod 30 and the eccentric wheel 20, among other things, are introduced into the gear housing 60 - by a cover shell 65, which is made of plastic, for example.
  • the cover shell 65 has a holding lip 67 on a side 63 facing the eccentric wheel 20, the course of the holding lip 67 following a circular path 23 of an eccentric point 21 of the eccentric wheel 20.
  • four retaining lips 67 concentric to one another and each having a different diameter are provided. The retaining lips 67 serve to secure the connecting rod 80 in the axial direction AR.
  • the connecting rod 30 also secures the eccentric wheel 20 in the axial direction AR by an annular uprising 33 of the connecting rod pin 31 in the eccentric wheel 20 - the contact point KP is incidentally located on this annular uprising 33 30 and indirectly (via the connecting rod 30) responsible for securing the eccentric wheel 20 in the axial direction AR.
  • This power flow described here manages without the “help” of the lubrication chamber separating element 90.
  • the connecting rod 30 and the eccentric wheel 20 are axially secured even without the lubrication space separating element 90, so that if necessary - for example if there is no regulatory requirement - the lubrication space separating element 90 can be dispensed with.
  • a lubricating space separating element 90 is provided.
  • the cover shell 65 has a support collar 66 which extends in the axial direction AR and which rests on the front sealing collar 83 in the axial direction AR and thus also exerts a pressing effect on the static sealing ring 84 in the axial direction AR .
  • the lubricating space separating element 90 itself is held in the gear housing 60.
  • the eccentric wheel 20 is additionally secured in the axial direction, namely indirectly via the dynamic sealing ring 82 of the annular sealing collar 81, which is formed in one piece with the end sealing collar 83.
  • the height of the annular sealing collar 81 is slightly less than the axial gap AS, the annular sealing collar 81 and thus the entire lubricating chamber separating element 90 is free of axial support loads that are directly or indirectly caused by the connecting rod 30.
  • the lubricating chamber separating element 90 can thus optionally be encompassed by the striking mechanism 70.

Landscapes

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

Abstract

La présente invention concerne un mécanisme de percussion électropneumatique destiné à un outil électrique portatif et plus spécifiquement à un marteau perforateur et/ou un marteau burineur, le mécanisme de percussion comprenant un boîtier de mécanisme, un tube de guidage au moins partiellement disposé dans le boîtier de mécanisme, un piston d'excitateur qui peut être déplacé dans le tube de guidage, une bielle accouplée au piston d'excitateur et un engrenage excentrique conçu sous la forme d'une roue dentée à denture externe, est accouplé à la bielle et est d'autre part monté de manière à pouvoir tourner autour d'un axe de rotation par rapport au boîtier de mécanisme, avec un espace axial formé entre une surface d'engrenage excentrique qui fait face à la bielle et une surface de bielle qui fait face à l'engrenage excentrique, de préférence afin d'éventuellement recevoir une ou plusieurs parties d'un élément de division de chambre de lubrification.
EP21717073.7A 2020-04-21 2021-04-07 Mécanisme de percussion électropneumatique Pending EP4139592A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20170526.6A EP3901498A1 (fr) 2020-04-21 2020-04-21 Mécanisme de percussion électropneumatique
PCT/EP2021/059072 WO2021213804A1 (fr) 2020-04-21 2021-04-07 Mécanisme de percussion électropneumatique

Publications (1)

Publication Number Publication Date
EP4139592A1 true EP4139592A1 (fr) 2023-03-01

Family

ID=70390824

Family Applications (2)

Application Number Title Priority Date Filing Date
EP20170526.6A Withdrawn EP3901498A1 (fr) 2020-04-21 2020-04-21 Mécanisme de percussion électropneumatique
EP21717073.7A Pending EP4139592A1 (fr) 2020-04-21 2021-04-07 Mécanisme de percussion électropneumatique

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP20170526.6A Withdrawn EP3901498A1 (fr) 2020-04-21 2020-04-21 Mécanisme de percussion électropneumatique

Country Status (4)

Country Link
US (1) US20230150103A1 (fr)
EP (2) EP3901498A1 (fr)
CN (1) CN115398130A (fr)
WO (1) WO2021213804A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116587226A (zh) * 2023-07-14 2023-08-15 江苏东成工具科技有限公司 空气压缩装置及其电动工具

Family Cites Families (5)

* 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
DE10034795A1 (de) * 2000-07-18 2002-02-21 Hilti Ag Elektrohandwerkzeuggerät mit elektropneumatischen Schlagwerk
DE102005061399A1 (de) * 2005-12-22 2007-07-05 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Bohr- und/oder Meißelhammer
DE102013221117A1 (de) * 2013-10-17 2015-05-07 Robert Bosch Gmbh Kraftübertragungsbauteil mit Schmierstoffvorratsdepot
EP2873488B1 (fr) * 2013-11-13 2020-08-12 HILTI Aktiengesellschaft Machine-outil manuelle

Also Published As

Publication number Publication date
US20230150103A1 (en) 2023-05-18
EP3901498A1 (fr) 2021-10-27
WO2021213804A1 (fr) 2021-10-28
CN115398130A (zh) 2022-11-25

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