EP0474651A1 - Marteau perforateur ou percuteur avec embrayage dans l'entrainement de la percussion. - Google Patents

Marteau perforateur ou percuteur avec embrayage dans l'entrainement de la percussion.

Info

Publication number
EP0474651A1
EP0474651A1 EP90906878A EP90906878A EP0474651A1 EP 0474651 A1 EP0474651 A1 EP 0474651A1 EP 90906878 A EP90906878 A EP 90906878A EP 90906878 A EP90906878 A EP 90906878A EP 0474651 A1 EP0474651 A1 EP 0474651A1
Authority
EP
European Patent Office
Prior art keywords
coupling part
hammer
control
percussion
axially
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.)
Granted
Application number
EP90906878A
Other languages
German (de)
English (en)
Other versions
EP0474651B1 (fr
Inventor
Wolfgang Schmid
Joerg Faelchle
Walter Laubengaier
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 EP0474651A1 publication Critical patent/EP0474651A1/fr
Application granted granted Critical
Publication of EP0474651B1 publication Critical patent/EP0474651B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/003—Clutches specially adapted therefor
    • 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
    • B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface

Definitions

  • the invention is based on a hammer drill or percussion hammer according to the preamble of claim 1.
  • a motor-driven rotary hammer is already known, the percussion mechanism of which is driven by a clutch between a motor-driven one Intermediate shaft and the movement conversion gear for generating the reciprocating piston movement can be switched off.
  • the clutch force is increased by a lever which is acted upon by the reaction forces of the striking mechanism.
  • the amplifying force exerted on the coupling is absorbed by a pin in the housing and a bearing of the intermediate shaft, which is supported in a special metal bearing bracket.
  • the effectiveness of the force amplification can be reduced by tolerances of the lever, the bearing pin and the bearing bracket. I'm under it very much
  • the hammer drill or percussion hammer according to the invention with the characterizing features of claim 1 has the advantage that both the contact pressure and the contact path for switching on the striking mechanism are reduced. This is achieved by a self-energizing clutch, which uses the motor power of the hammer to increase the clutch force.
  • the design of the hammer according to claims 5ff has the advantage that the effectiveness of the clutch force amplification is independent of the effects of non-associated components, such as housings, etc. This is achieved in that the intermediate shaft is free of clutch forces on the outside. This eliminates all tolerances originating from outside, i.e. from housing parts, levers or the like, which impair the function.
  • the plastic housing does not absorb any forces from the clutch force reinforcement.
  • the measures of claims 13 to 15 relate to a further exemplary embodiment which additionally has a braking device for faster disengagement. drawing
  • FIG. 1 shows a longitudinal section through the front part of a rotary hammer in a first embodiment
  • FIG. 2 shows a longitudinal section through a hammer mechanism of a rotary hammer in a second exemplary embodiment.
  • the rotary hammer 2 is surrounded by a housing 3 made of plastic and has a tool holder 4 at the front into which a tool 5 can be inserted. Inside the housing 3 there is a motor, not shown, of which only the motor pinion 7 is visible. The pinion 7 meshes with a gear wheel 9 which is fixedly connected to a shaft 8.
  • the shaft 8, also referred to as an intermediate shaft, is mounted on both sides in bearings 10, 11 in the housing 3. Following the gear 9, a freely rotating but axially fixed coupling part 12 sits on the intermediate shaft, on which a swash plate is arranged as the drive member 13 of a movement conversion gear 14.
  • the design of the swash plate gear 14 and the hammer mechanism 15 driven thereby is described in detail in DE-OS 35 06 695 (US 4,719,976).
  • the coupling part 12 has on the side facing away from the gear 9 an inner cone 17 with a conical surface standing at an acute angle to the shaft axis.
  • the coupling part 12 is axially fixed to the intermediate shaft 8 with a snap ring 18.
  • the outer cone 21 has a conical outer surface corresponding to the inner cone 17 and can be non-positively coupled with it.
  • the coupling part 20 has a radial annular stop surface 22 which points away from the fixed coupling part 12 and which is provided for engaging an actuating element for the coupling.
  • the coupling part 20 also has a drum-shaped control sleeve 23 which surrounds the shaft 8 and which has a substantially helical control surface 24 on its end face facing away from the cone surface 21.
  • the slope of the control surface 24 is not self-locking.
  • the control surface has a jump with a short axially directed section 25.
  • a separating spring 26 acts on the coupling part 20 in the sense of an opening of the coupling and is supported against the snap ring 18.
  • control surface 24 there is a corresponding control surface 27 of a control disk 28, which is fixedly or also integrally connected to the shaft 8.
  • the control surface 27 also has a jump with a short axially directed section 29.
  • the control disk 28 is connected in one piece to a spur gear 30 which engages in a gear 31 on the tool spindle 32 of the motor hammer and drives it permanently rotating.
  • an axial bearing 33 provided with rolling elements is arranged on the main spindle and can be pressed against the stop surface 22 of the coupling part 20.
  • the main spindle 32 is connected to the tool 5 via the tool holder 4 and is axially displaceable within limits.
  • the striking mechanism 15 is accommodated within the main spindle.
  • the motor is switched on, which drives the tool spindle via the gear wheels 7, 9, 30 and 31.
  • the coupling part 20 is urged by the spring 26 against the control disk 28, so that the control surfaces 24 and 27 are free from one another and sections 25 and 29 face each other. In this position, the coupling part 20 is rotatably carried along by the control disk 28 and does not move axially relative to the control disk 28.
  • the coupling part 20 is non-positively driven by the control disk 28 via the control surfaces 24 and 27 and at the same time is pressed axially against the force of the spring 26 against the coupling part 12.
  • the coupling part 20 is wedged between the fixed coupling part 12 and the control disk 28, which means that the self-reinforcement
  • the thrust bearing 33 does not have to be pressed onto the coupling part 12. If the striking mechanism 15 is now in the overrun phase, that is to say that it is not being actively driven by the intermediate shaft 8, but rather when it is being returned Since the intermediate shaft drives for a short time, the self-reinforcing effect of the control surfaces 24 and 27 also ceases for a short time. At this moment, the force of the spring 26 is sufficient to drive the coupling parts 12 and 20 apart and thus to release the coupling, which leads to the desired stoppage of the striking mechanism 15.
  • the coupling part 120 is rotatably supported in a needle bearing 140 and an axial bearing 141 on a control sleeve 123.
  • the coupling part 120 carries a lug 142 which, when the coupling is disengaged, can interact with an axially fixed brake plate 143.
  • the control sleeve 123 has in its inner bore 119 a control curve 124 in the form of a helical groove.
  • a corresponding groove is arranged as a cam 127 in the shaft 108.
  • Balls 144 are held in the grooves 124, 127 so that a ball screw is formed.
  • a pressure bracket 145 bears against the end face 122 of the control sleeve 123 and is connected via an axial bearing 133 to an axially displaceable tool spindle 132.
  • a gear 131 which meshes with a spur gear 130 on the shaft 108, is fastened on the tool spindle 132.
  • the function of the clutch 112/120 in the second embodiment corresponds to that of the first embodiment.
  • the pressure lever 145 presses against the control sleeve 123 and moves it in the direction of the coupling part 112.
  • the transmission connection 123, 124, 127, 144 then takes effect the coupling part 112 in a position as shown in Figure 2.
  • the control sleeve 123 is braked with respect to the shaft 108 and moved in the direction of the fixed coupling part 112 because of the differential speed as a result of the ball screw 124, 127, 144.
  • the pressure lever 145 When the tool is lifted off the rock, the pressure lever 145 is also lifted off the end face 122 and the separating spring 126 and the gas forces of the striking mechanism 115 which exert tensile forces on the drive member in phases lead to a release of the coupling 112/120.
  • the clutch When the clutch is released, only the control sleeve 123 rotates with the shaft 108; the coupling part 120 rotates via the bearings 140, 141 relative to the control sleeve 123 and faces the striking mechanism 115. Switching off the striking mechanism is facilitated by the brake plate 143 on which the coupling part 120 is braked by stripes with its nose 142.
  • the invention is not limited to the exemplary embodiments. Rather, the individual features from the exemplary embodiments can also be combined with one another in another way or with features from the cited prior art, such as the arrangement of a needle bearing on the intermediate shaft for mounting the coupling part 12.
  • the clutch 12/20 or 112/120 can also be used instead of purely frictionally positive. B. with more or less flat claws in the axial direction.
  • the separating spring 26 can also be integrated in one of the coupling parts 12, 20, for example in such a way that it consists of spring steel or has spring steel inserts.
  • the invention is also suitable for pure impact hammers. For this, e.g. only the gears 30 and 31 or 130 and 131 to be omitted.

Landscapes

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

Abstract

Marteau mécanique équipé d'un système de percussion pneumatique enclenché par la pression du marteau sur la zone de travail, conçu pour améliorer l'efficacité du système d'enclenchement et diminuer la force de pression à fournir par l'utilisateur. Cet objectif est atteint au moyen d'un embrayage (12/20) à renforcement automatique, dont la force d'accouplement est fournie principalement par l'arbre intermédiaire (8) au moyen d'un disque de commande (28). Des surfaces de commande (27) sur le disque de commande (28 et 24) sur l'élément d'embrayage mobile (20) transforment le mouvement de rotation en force d'accouplement axiale.
EP90906878A 1989-05-31 1990-05-12 Marteau perforateur ou percuteur avec embrayage dans l'entrainement de la percussion Expired - Lifetime EP0474651B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE3917644 1989-05-31
DE3917644 1989-05-31
DE3931329 1989-09-20
DE3931329A DE3931329C1 (fr) 1989-05-31 1989-09-20
PCT/DE1990/000341 WO1990014929A1 (fr) 1989-05-31 1990-05-12 Marteau perforateur ou percuteur avec embrayage dans l'entrainement de la percussion

Publications (2)

Publication Number Publication Date
EP0474651A1 true EP0474651A1 (fr) 1992-03-18
EP0474651B1 EP0474651B1 (fr) 1994-08-24

Family

ID=25881420

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90906878A Expired - Lifetime EP0474651B1 (fr) 1989-05-31 1990-05-12 Marteau perforateur ou percuteur avec embrayage dans l'entrainement de la percussion

Country Status (6)

Country Link
US (1) US5277259A (fr)
EP (1) EP0474651B1 (fr)
JP (1) JP2930711B2 (fr)
BR (1) BR9007403A (fr)
DE (2) DE3931329C1 (fr)
WO (1) WO1990014929A1 (fr)

Families Citing this family (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4231985A1 (de) * 1992-09-24 1994-03-31 Bosch Gmbh Robert Bohr- und/oder Schlaghammer
DE4239294A1 (de) * 1992-11-23 1994-05-26 Black & Decker Inc Bohrhammer mit pneumatischem Schlagwerk
CO4130343A1 (es) * 1993-02-03 1995-02-13 Sencorp Herramienta electromecanica para guiar grapas
DE4344849A1 (de) * 1993-12-29 1995-07-06 Fein C & E Werkzeugmaschine
EP0746449B1 (fr) * 1994-02-28 2000-01-05 Atlas Copco Berema Aktiebolag Systeme de soupapes dans des moteurs a air comprime
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
DE19717712A1 (de) * 1997-04-18 1998-10-22 Black & Decker Inc Bohrhammer
DE19955412A1 (de) * 1999-11-18 2001-05-23 Hilti Ag Bohr- und Meisselgerät
DE10106034B4 (de) * 2001-02-09 2009-11-26 Robert Bosch Gmbh Handwerkzeugmaschine
DE10140319A1 (de) * 2001-08-16 2003-03-13 Bosch Gmbh Robert Handwerkzeugmaschine, insbesondere Bohr- und/oder Meißelhammer
GB0213289D0 (en) * 2002-06-11 2002-07-24 Black & Decker Inc Rotary hammer
GB0214772D0 (en) * 2002-06-26 2002-08-07 Black & Decker Inc Hammer
GB2394437A (en) * 2002-10-23 2004-04-28 Black & Decker Inc Hammer including a piston with wear-reducing washers
GB2396130B (en) * 2002-12-10 2005-09-28 Black & Decker Inc Apparatus for producing self-exciting hammer action, and rotary power tool incorporating such apparatus
GB0311045D0 (en) * 2003-05-14 2003-06-18 Black & Decker Inc Rotary hammer
DE10332694B3 (de) * 2003-07-18 2004-10-28 Eisenbach, Bernhard, Dipl.-Ing. Werkzeugmaschine zum drehbaren und zuschaltbaren Antrieb von einem oder mehreren Werkzeugen
DE102004026845A1 (de) * 2004-06-02 2005-12-22 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Bohr- und/oder Schlaghammer
EP1674207B1 (fr) * 2004-12-23 2008-12-10 BLACK & DECKER INC. Outil motorisé
GB2422569A (en) * 2005-01-26 2006-08-02 Black & Decker Inc Rotary hammer
GB2423050A (en) * 2005-02-10 2006-08-16 Black & Decker Inc Hammer with ramps causing pivotal oscillation
DE102005047600A1 (de) * 2005-10-05 2007-04-12 Robert Bosch Gmbh Handwerkzeugmaschine mit einer Welle und mit einem auf der Welle gelagerten Hubantriebslager
DE102006056849A1 (de) * 2006-12-01 2008-06-05 Robert Bosch Gmbh Handwerkzeugmaschine
DE102007001494B3 (de) * 2007-01-10 2008-07-10 Aeg Electric Tools Gmbh Handgeführter Bohrhammer
DE102007009985A1 (de) * 2007-03-02 2008-09-25 Robert Bosch Gmbh Handwerkzeugmaschine
DE102009027560A1 (de) * 2009-07-09 2011-01-13 Robert Bosch Gmbh Bohrhammer- und/oder Meißelgerät
JP5395620B2 (ja) * 2009-11-02 2014-01-22 株式会社マキタ 打撃工具
CN101758486B (zh) * 2010-01-21 2011-09-28 浙江海王电器有限公司 轻型单钮多功能电锤
US8636081B2 (en) 2011-12-15 2014-01-28 Milwaukee Electric Tool Corporation Rotary hammer
DE102010062094A1 (de) * 2010-11-29 2012-05-31 Robert Bosch Gmbh Hammerschlagwerk
EP2809470B1 (fr) * 2012-02-03 2020-01-15 Milwaukee Electric Tool Corporation Marteau rotatif
DE102013208900A1 (de) * 2013-05-14 2014-11-20 Robert Bosch Gmbh Handwerkzeugvorrichtung
JP6325360B2 (ja) * 2014-06-12 2018-05-16 株式会社マキタ 打撃工具
US9909666B2 (en) 2014-12-01 2018-03-06 Caterpillar Inc. Hammer having piston sleeve with spiral grooves
CN206200893U (zh) * 2016-10-20 2017-05-31 布兰特·戈登·麦克阿瑟 一种可配合家用电钻使用的电动凿具

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2449191C2 (de) * 1974-10-16 1988-03-24 Robert Bosch Gmbh, 7000 Stuttgart Hammer
JPS5969808U (ja) * 1982-09-07 1984-05-11 株式会社マキタ 震動ドリルにおける震動装置
DE3311265A1 (de) * 1983-03-28 1984-10-11 Hilti Ag, Schaan Elektropneumatischer bohr- und meisselhammer
DE3429140A1 (de) * 1984-08-08 1986-02-20 Black & Decker Inc., Newark, Del. Bohrhammer mit einem pneumatischen schlagwerk
DE3503507A1 (de) * 1985-02-02 1986-08-07 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
DE3506695A1 (de) * 1985-02-26 1986-08-28 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
DE3732288C2 (de) * 1987-09-25 1993-10-14 Atlas Copco Elektrowerkzeuge Elektropneumatischer Drehschlagbohrhammer mit einer Vorrichtung zum Stillsetzen des Schlagwerkes
JPH024072A (ja) * 1988-06-20 1990-01-09 Fujitsu Ltd パケット交換方式

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9014929A1 *

Also Published As

Publication number Publication date
JPH04506036A (ja) 1992-10-22
DE3931329C1 (fr) 1990-06-28
DE59006913D1 (de) 1994-09-29
WO1990014929A1 (fr) 1990-12-13
US5277259A (en) 1994-01-11
EP0474651B1 (fr) 1994-08-24
BR9007403A (pt) 1992-06-16
JP2930711B2 (ja) 1999-08-03

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