EP2104596A1 - Mécanisme de percussion d'une machine-outil électrique portative - Google Patents

Mécanisme de percussion d'une machine-outil électrique portative

Info

Publication number
EP2104596A1
EP2104596A1 EP07821957A EP07821957A EP2104596A1 EP 2104596 A1 EP2104596 A1 EP 2104596A1 EP 07821957 A EP07821957 A EP 07821957A EP 07821957 A EP07821957 A EP 07821957A EP 2104596 A1 EP2104596 A1 EP 2104596A1
Authority
EP
European Patent Office
Prior art keywords
piston
guide
mechanism according
hammer tube
striking mechanism
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Withdrawn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
EP07821957A
Other languages
German (de)
English (en)
Inventor
Gerhard Meixner
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 EP2104596A1 publication Critical patent/EP2104596A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/003—Crossed drill and motor spindles
    • 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
    • B25D2217/0023—Pistons
    • 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
    • B25D2250/245—Spatial arrangement of components of the tool relative to each other

Definitions

  • the invention relates to a percussion of an electric hand tool, in particular a drill and / or percussion hammer, with a hammer tube, with a longitudinally displaceably mounted with a guide portion in the hammer tube piston and with a piston outer guide on which a guide portion of the piston is guided longitudinally displaceable.
  • Piston outer guide is known, for example for impact hammers.
  • the percussion movement abruptly propels a tool, such as a chisel, periodically recurring.
  • a tool such as a chisel
  • the piston reciprocated by an electric motor moves - at least partially - in the hammer tube, thereby driving a racket also guided by a hammer tube via an air cushion lying between the piston and the racket.
  • the moving impact mass of the racquet transmits a pulse when impacting on a tool element.
  • the tool element may be the tool itself, a part of a tool holder or a striker located between the tool and the racket.
  • the preferably cylindrical piston is mounted longitudinally displaceably with a guide section in the hammer tube and is driven by the drive of the impact mechanism, for example via a connecting rod. Since the piston lies with its guide area in any position of the reciprocating movement outside of the hammer tube, the percussion mechanism also has a piston outer guide which is also arranged outside the hammer tube. Thus, the piston is mounted longitudinally displaceable on the one hand with a guide portion in the hammer tube and on the other hand guided longitudinally displaceable with a, seen from the tool, in the longitudinal direction of the hammer tube behind the hammer tube piston outer guide.
  • the usual length of a Hammer with cylindrical piston is composed of the length of the racket, the air cushion, the piston and the associated connecting rod or other piston drive element. This length can not be shortened without affecting the function of the percussion easily.
  • a piston end located outside the hammer tube has an overlapping end for reaching over an end region of the hammer tube and the guide region at least partially belongs to the overlapping end or is fastened there.
  • the guide region is arranged at least partially on the outer circumference at the overlapping end. Due to the fact that the piston end projecting out of the hammer tube has an overlapping end for reaching over an end region of the hammer tube and the guide region is at least partially heard or fastened to the overlapping end, the piston outer guide can be arranged at least in part in a longitudinal section of the striking mechanism at the same height as the latter hammer tube.
  • the striking mechanism has the piston drive.
  • This piston output is preferably part of a total drive, which drives the tool to all of the electric hand tool machine enabled movements.
  • a piston drive element is formed or attached to the overlapping, which belongs to a piston drive.
  • the piston drive element is, for example, a connecting rod which is fastened at the cross-over with a splint and with which the piston drive reciprocates the piston in an oscillating manner. Due to the design of the piston drive element at the overlapping the piston drive engages laterally on Cross-over of the piston, which advantageously a particularly short length of the impact mechanism is achieved.
  • the piston drive has an eccentric arrangement for generating the piston movement, which cooperates with the piston drive element.
  • the eccentric arrangement has in particular a crank. Due to the interaction of the crank with the piston drive element, the oscillating reciprocation of the piston becomes rotational movement of the piston drive.
  • the piston drive element is designed as a sliding guide.
  • the slide guide is formed by two opposing webs, between which forms a groove.
  • the webs are preferably formed integrally with the cross-over.
  • the slotted guide is arranged substantially perpendicular to the direction of movement of the piston.
  • the eccentric arrangement has an eccentric projection, which engages in the slotted guide.
  • the overlapping with the piston end forms an over-grip sleeve or at least one Studentsgreifarm.
  • the design of the overlapping as over-grip sleeve offers the advantage that it has a large area for the formation or attachment of the guide area and / or the piston drive element.
  • a cross-over designed as at least one Studentsgreifarm has the advantage that less material is needed.
  • the formation of the overlapping as at least one Kochgreifarm the advantage that it can be designed so that other elements of the electric power tool - especially drive elements - can be arranged in the region of the end of the hammer tube.
  • the piston is designed as a hollow piston with a cavity.
  • the design of the piston as a hollow piston saves material and provides additional space available, can be installed in the other components of the electric power tool. As a result, the overall length of the electric power tool can be further reduced. Under a hollow piston is in connection with the striking mechanism according to the invention also to understand a hollow piston whose cavity is formed by the piston and its overlapping arms.
  • the hollow space of the hollow piston has an access opening which faces away from the hammer tube.
  • a part of the piston drive or another element of the electric hand-held power tool protrudes into the cavity of the hollow piston through the access opening.
  • the term hollow piston is not limited in connection with the impact mechanism according to the invention to a well-known in percussion pot piston, which simultaneously receives the racket to its leadership.
  • the invention relates to an electric hand tool, in particular a drill and / or percussion hammer, with a striking mechanism mentioned above.
  • Figure 1 shows a first embodiment of the invention
  • Figure 2 shows a second embodiment of the invention.
  • FIG. 1 shows a schematic side view of a part of an electric hand tool 1, which is designed as a hammer 2.
  • a percussion mechanism 5 arranged in a middle section 3 of a housing 4.
  • the percussion mechanism 5 consists essentially of a hammer tube 13 with a longitudinal axis 14, a hammer tube 13 mounted in the racket 15 and an end portion 16 of the hammer tube 13 arranged piston 17.
  • the piston 17 has a face 15 facing the racket 15, to which a guide section 20 of the piston 17 adjoins.
  • the guide section 20 has a lateral surface 21, which lies opposite an inner surface 22 of the hammer tube 13.
  • the piston 17 has in its outer surface 21 in the guide portion 20 an annular groove 23 in which an O-ring 24 for sealing the piston 17 rests against the inner surface 22 of the hammer tube 13.
  • An inner piston 25, which extends up to a piston end 26 of the piston 17 and has a smaller diameter than the piston 17 in the guide section 20, adjoins the guide section 20 of the piston 17 axially.
  • the piston end 26 has an inner piston 25 that partially overlaps Overarching 27 on.
  • the piston outer guide 31 is disposed outside the hammer tube 13 and engages over the end portion 16 of the hammer tube 13 in a section A and an adjoining the end portion 16 axial region B, which adjoins the end portion 16 of the hammer tube 13.
  • the piston outer guide 31 has in a section with a sectional surface perpendicular to the longitudinal axis 14 a C-shaped contour with which it surrounds the over-gripping sleeve 28 circumferentially, wherein a peripheral region is omitted.
  • the overlapping end 27 has on its outer side 32 a guide 33 arranged transversely to the longitudinal axis 14 of the hammer tube 13.
  • the slotted guide 33 is a Piston drive element 34 and is formed by two opposing webs 35, 35 ', which are formed in one piece with the transfer sleeve 28 in the illustrated embodiment. In this case, a groove 36 is formed between the webs 35, 35 '.
  • the drive unit 8 has the electric motor 9 and the two-stage transmission 10 with the first gear stage 11 and the second gear stage 12. It is part of the striking mechanism 13.
  • the electric motor 9 has an output shaft 37, which is arranged parallel to a rotatably mounted shaft 38 of the first gear stage 11.
  • the first gear stage 11 consists of the shaft 38, which is supported by two mutually spaced bearings and on the two transmission gears 39, 40 spaced from each other with a toothing arranged and rotatably connected to the shaft 38.
  • the transmission gear 40 has a smaller diameter than the transmission gear 39.
  • a toothing is formed, with which a spur gear teeth of the transmission gear 39 meshes.
  • the second gear 12 consists essentially of a rotatably mounted shaft 42 which is supported by two spaced-apart rolling bearings. On the shaft 42, a transmission gear 43 and an eccentric 44 is arranged and rotatably connected to the shaft 42.
  • the eccentric gear 44 has an eccentric to the longitudinal axis of the shaft 42, pin-shaped Exzentervorsprung 45 which engages in the groove 36 of the guide slot 33.
  • the illustrated part of the drive unit 8 is thus a piston drive 46, which converts the rotational movement of the shaft 42 into an oscillating reciprocating motion of the piston 17 with an eccentric arrangement 47.
  • the position of the piston outer guide 31 can be displaced in the direction of the hammer tube 13 with respect to a striking mechanism which is not in accordance with the invention with a piston without an overlapping end with an equally large guide surface of the guide region 29.
  • This displacement allows an axial section A ("overlap region") to be created in which the piston outer guide 31 engages around the end region 16 of the hammer tube 13.
  • the length L of the percussion mechanism 5 decreases by the length I of the section A around that of the piston outer guide 31 extends axially less far behind the end portion 16 of the hammer tube 13.
  • the length L can be further reduced by engaging the eccentric arrangement 47 with the eccentric projection 45 on the piston drive element 34 designed as a slide guide 33 in the region of the overlapping end 27.
  • the electric hand tool 1 of Figure 2 substantially corresponds to that of Figure 1, so that only the differences will be discussed here.
  • the piston 17 of the percussion mechanism 5 shown in FIG. 2 is designed as a hollow piston 48, which has an access opening 49 facing away from the hammer tube 13.
  • the piston drive 46 is arranged in the resulting cavity 50 of the hollow piston 48.
  • This consists of the electric motor 9 with its output shaft 37, on which the eccentric 44 is arranged rotationally fixed.
  • the Exzentervorsprung 45 of the eccentric 44 engages in the arranged on the inner surface 51 of a Kochgreifarms slide link 33 33.
  • the Studentsgreifarm 52 also carries a cross-27 with guide portion 29 for guiding the piston 17.

Landscapes

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

Abstract

La présente invention concerne un mécanisme de percussion (5) d'une machine-outil électrique portative (1), en particulier d'un marteau perforateur et/ou à percussion (2), comprenant un tube de marteau (13), comprenant un piston (17) logé de manière à pouvoir se déplacer longitudinalement avec une section de guidage (20) dans le tube de marteau (13) et comprenant un guidage extérieur de piston (31) sur lequel une zone de guidage (29) du piston (17) est guidée de manière à pouvoir se déplacer longitudinalement. Une extrémité de piston (26) posée à l'extérieur du tube de marteau (13) comprend une extrémité de chevauchement (27) destinée à chevaucher une zone d'extrémité (16) du tube de marteau (13) et la zone de guidage (29) appartient au moins en partie à l'extrémité de chevauchement (27) ou y est fixée.
EP07821957A 2006-12-27 2007-10-29 Mécanisme de percussion d'une machine-outil électrique portative Withdrawn EP2104596A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006061627A DE102006061627A1 (de) 2006-12-27 2006-12-27 Schlagwerk einer Elektrohandwerkzeugmaschine
PCT/EP2007/061597 WO2008080653A1 (fr) 2006-12-27 2007-10-29 Mécanisme de percussion d'une machine-outil électrique portative

Publications (1)

Publication Number Publication Date
EP2104596A1 true EP2104596A1 (fr) 2009-09-30

Family

ID=39008420

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07821957A Withdrawn EP2104596A1 (fr) 2006-12-27 2007-10-29 Mécanisme de percussion d'une machine-outil électrique portative

Country Status (6)

Country Link
US (1) US8096369B2 (fr)
EP (1) EP2104596A1 (fr)
CN (1) CN101568411B (fr)
DE (1) DE102006061627A1 (fr)
RU (1) RU2464157C2 (fr)
WO (1) WO2008080653A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102371573A (zh) * 2010-08-10 2012-03-14 南京德朔实业有限公司 电动工具
EP3697574B1 (fr) 2017-10-20 2025-03-19 Milwaukee Electric Tool Corporation Outil à percussion
US11059155B2 (en) 2018-01-26 2021-07-13 Milwaukee Electric Tool Corporation Percussion tool
DE102021211163A1 (de) * 2021-10-04 2023-04-06 Robert Bosch Gesellschaft mit beschränkter Haftung Handwerkzeugmaschine mit einem mechanischen Schlagwerk

Family Cites Families (24)

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Publication number Priority date Publication date Assignee Title
GB446939A (en) * 1935-07-16 1936-05-08 Karl Axel Ragnar Erfass Improvements in or relating to motor or power driven hammers
SU114007A1 (ru) * 1956-03-05 1957-11-30 Н.М. Батуев Электропневматический молоток
DE2242944B2 (de) * 1972-08-31 1981-04-23 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
DE2702128C3 (de) * 1977-01-20 1981-01-22 Metabowerke Kg, Closs, Rauch & Schnizler, 7440 Nuertingen Motorisch angetriebener Hammer, bei dem in einem Zylinder ein Kolben verschiebbar geführt ist
ATE4530T1 (de) * 1979-08-31 1983-09-15 Black & Decker Inc. Tragbares werkzeug, z.b. rotierender hammer oder dgl.
DE2938513A1 (de) * 1979-09-24 1981-04-09 Hilti AG, 9494 Schaan Bohrhammer
ATE11750T1 (de) * 1980-11-18 1985-02-15 Black & Decker Inc. Schlagbohrgeraet.
EP0067682B1 (fr) * 1981-06-17 1985-03-20 Black & Decker Inc. Outils portatifs à moteur comportant des moyens de guidage pour des organes en mouvement linéaire
DE3224176C2 (de) * 1982-06-29 1995-02-02 Bosch Gmbh Robert Motorisch angetriebene schlagende Handwerkzeugmaschine
US4712625A (en) * 1986-01-14 1987-12-15 Willy Kress Drilling and percussion hammer
ATE84850T1 (de) * 1989-01-11 1993-02-15 Sulzer Ag Hydraulischer bohrhammer.
DE4215288A1 (de) * 1991-07-08 1993-01-14 Bosch Gmbh Robert Bohrhammer
DE19510964A1 (de) * 1995-03-24 1996-09-26 Hilti Ag Handgerät zur trockenen materialabtragenden Bearbeitung von spröden und/oder duktil versagenden Bauteilen und Adapter für ein Hammerbohrgerät
GB9524180D0 (en) * 1995-11-27 1996-01-31 Black & Decker Inc Hammer mechanism
DE19810088C1 (de) * 1998-03-10 1999-08-26 Bosch Gmbh Robert Bohr- und/oder Schlaghammer mit in Abhängigkeit von der Einstecktiefe eines Werkzeuges aktivierbarem Schlagwerk
US6223833B1 (en) * 1999-06-03 2001-05-01 One World Technologies, Inc. Spindle lock and chipping mechanism for hammer drill
US6354267B1 (en) * 2000-03-28 2002-03-12 Borgwarner Inc. Injection molded throttle body
DE10030962C2 (de) * 2000-06-24 2002-06-20 Hilti Ag Elektrohandwerkzeuggerät mit Schlagwerk
EP1302281B1 (fr) * 2001-10-15 2007-05-02 HILTI Aktiengesellschaft Conduit d'air de refroidissement d'un outil de percussion
DE10152959B4 (de) * 2001-10-26 2007-03-15 Robert Bosch Gmbh Handwerkzeugmaschine
DE10261030A1 (de) * 2002-12-24 2004-07-08 Robert Bosch Gmbh Bohrhammer
DE102004020177B4 (de) * 2004-04-24 2024-07-18 Robert Bosch Gmbh Handwerkzeugmaschine mit einem drehenden und/oder schlagenden Antrieb
DE102006059076A1 (de) * 2006-12-14 2008-06-19 Robert Bosch Gmbh Schlagwerk einer Elektrohandwerkzeugmaschine
DE102006060320A1 (de) * 2006-12-20 2008-06-26 Robert Bosch Gmbh Schlagwerk für eine Handwerkzeugmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008080653A1 *

Also Published As

Publication number Publication date
RU2009128746A (ru) 2011-02-10
US8096369B2 (en) 2012-01-17
US20100326689A1 (en) 2010-12-30
WO2008080653A1 (fr) 2008-07-10
DE102006061627A1 (de) 2008-07-10
CN101568411A (zh) 2009-10-28
CN101568411B (zh) 2011-12-21
RU2464157C2 (ru) 2012-10-20

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