EP2117776B1 - Ponceuse excentrique - Google Patents

Ponceuse excentrique Download PDF

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Publication number
EP2117776B1
EP2117776B1 EP07822050A EP07822050A EP2117776B1 EP 2117776 B1 EP2117776 B1 EP 2117776B1 EP 07822050 A EP07822050 A EP 07822050A EP 07822050 A EP07822050 A EP 07822050A EP 2117776 B1 EP2117776 B1 EP 2117776B1
Authority
EP
European Patent Office
Prior art keywords
friction
friction surface
backing pad
eccentric
sanding pad
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.)
Active
Application number
EP07822050A
Other languages
German (de)
English (en)
Other versions
EP2117776A1 (fr
Inventor
Heiko Roehm
Andreas Heber
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2117776A1 publication Critical patent/EP2117776A1/fr
Application granted granted Critical
Publication of EP2117776B1 publication Critical patent/EP2117776B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement

Definitions

  • the invention relates to an eccentric grinder according to the preamble of claim 1.
  • an eccentric grinder which has an electric drive motor in a housing, the drive shaft via an eccentric bearing drives a support shaft of a sanding pad on the underside of an abrasive is to be attached.
  • a superimposed circular and rotary working movement of the sanding pad including the abrasive thereon is achieved.
  • the working position of the grinding plate is pressed with the abrasive against the surface of the workpiece to be machined, due to the storage of the support shaft to the drive shaft rotation of the grinding plate about its own axis is only possible to a limited extent.
  • there is the risk that the sanding disc will start to rotate due to the bearing friction with the speed of the drive shaft at idle the eccentric grinder, so when lifting the sanding pad of the workpiece to be machined.
  • a friction brake In order to limit the self-rotation of the sanding plate at idle, a friction brake is provided which has cooperating friction on the sanding pad and on the sanding pad facing bottom of the housing of the eccentric grinder.
  • the friction brake can idle of the eccentric grinder an outer Wälzkranz on the sanding pad on an inner, associated Wälzkranz run on the housing a rolling motion, whereby a self-rotation of the sanding pad is not prevented, however, the speed of the sanding pad against the engine speed on the division of outer and inner ring gear can be reduced , A complete inhibition of self-rotation is not provided in this embodiment.
  • the DE 101 48 339 A1 shows a Exzenterschteifer according to the preamble of claim 1, in the housing, a drive is arranged, the drive shaft via an eccentric bearing drives a support shaft of a sanding pad.
  • the eccentric grinder has a Reibbrems driving comprising an annular Reibbremselement and a support plate, which is part of the grinding plate and on the underside by means of Velcro an intermediate plate is arranged as a support of a sanding pad.
  • the friction brake facing the end face of the support plate has radially from the inside out a sloping course, whereby the self-rotation of the sanding pad inhibited and also a stabilizing effect is achieved so that angular deviations of the sanding pad are compensated by tilting from the drive shaft normal again.
  • connection between the support plate and the intermediate plate takes place by means of a plurality of latching connections, which are arranged on the radially outer edge, with a latching connection portion on the support plate extends radially to the outer edge.
  • the invention has the object of evaluating a generic eccentric grinder in such a way that at the least possible wear of the friction brake, the self-rotation of the sanding pad is prevented in an improved condition of the eccentric grinder.
  • the eccentric grinder according to the invention has a drive in a housing, usually an electric drive, wherein in the context of the invention, a hydraulic or pneumatic drive is considered, drives the drive shaft via an eccentric bearing a support shaft of a sanding pad.
  • an abrasive can be attached, for example, an abrasive paper, which is placed on the surface of a workpiece for machining. Due to the bearing of the sanding disk carrying the support shaft in the drive shaft forcibly transmitted to the sanding disc an eccentric movement.
  • a self-rotation of the sanding pad which is fundamentally made possible by the bearing of the support shaft, is only possible to a limited extent in the grinding operation due to the grinding forces acting on the sanding pad.
  • Reibbrems In order to prevent the idler of the eccentric grinder, so after lifting the grinding disc of the workpiece to be machined, due to the bearing friction high rotation of the grinding disc to the rotational speed of the drive motor, a Reibbrems leverage is provided which prevents the self-rotation of the grinding disc at idle or at least decelerates.
  • This Reibbrems leverage comprises on the one hand a Reibbremselement, which is arranged on the housing of the eccentric grinder, and on the other hand, an associated friction surface on the sanding pad, which is acted upon by the Reibbremselement with a frictional force.
  • the friction surface of the sanding pad has, relative to a horizontal plane perpendicular to the axis of the support shaft, a course sloping from the inside to the outside in the radial direction. This means that the surface facing the housing friction surface on the sanding pad relative to the horizontal plane in the region of the axis of rotation of the sanding pad has the highest elevation, whereas the friction surface falls to the radially outer edge of the sanding pad.
  • This embodiment has the advantage that the side of the sanding disc, which is currently deflected eccentrically, is acted upon by the friction element to a greater extent than the diametrically opposite side of the sanding pad, since due to the gradient of the friction surface towards the center of the sanding pad, the friction brake element on the deflected side has a smaller distance from the Reibbremselement and therefore more or more comes into frictional contact than on the opposite side.
  • the self-rotation of the grinding disc is effectively inhibited, since the friction element exerts a frictional force on the friction surface on the eccentrically deflected side.
  • a stabilizing effect is achieved, which is due to the fact that the friction element pushes the sanding plate on the eccentrically deflected side slightly downwards, whereby the sanding pad is returned to its normal working position with parallel axis of the support shaft to the drive shaft.
  • a stabilizing friction brake element on the other hand, there is the danger that the sanding pad tilts due to the eccentric drive and the bearing clearance of the drive shaft normal, whereby the bearing friction is amplified and a rotation of the self-rotation of the sanding pad is to be feared. This effect can be avoided by means of the embodiment according to the invention or at least greatly reduced.
  • the friction surface on the sanding pad can, in principle, have any desired cross-sectional geometry, as long as it is ensured that the friction surface falls off towards the outer edge of the sanding pad and has a cone angle of at least 5 °, which can be realized in a structurally particularly simple manner.
  • the friction brake element is expediently designed as a friction ring, which advantageously has a constant cross section in the circumferential direction.
  • This compensation section which is formed for example in cross-section V-shaped, allows in the direction of the friction brake force to be transmitted in Reibbremselement an elastically resilient behavior, which also Fluctuations of the sanding plate during the circulation can be compensated.
  • the friction surface is designed as a separately formed contact component, which is connected to the sanding pad.
  • the design as a separate component has the advantage that the friction surface may consist of a different material than the sanding pad. Suitable materials for the friction surface are various plastics, for example polyamide, polypropylene, polycarbonate or PMMA. Alternatively, the friction surface may also be made of metal, in particular of aluminum or magnesium, or of a foam material.
  • the in Fig. 1 illustrated eccentric grinder 1 has in a housing 2 to an electric drive motor 3, which is supplied via a power supply 4 with electric current.
  • an eccentric arranged bearing On a drive shaft 5 of the drive motor 3 is an eccentric arranged bearing a support shaft 7 mounted, which carries a sanding pad 8, on the underside 9, an abrasive for machining the surface of a workpiece is to be attached.
  • the bearing 6 is formed, for example, as a ball bearing and allows a self-rotation of the support shaft 7 about the rotation axis 11, which also represents the rotation or rotation axis of the sanding pad 8. This axis of rotation 11 is located with eccentric distance e parallel to the axis of rotation 10 of the drive shaft fifth
  • the dust fan 13 is fixedly connected to the drive shaft 5 of the drive motor and has an eccentrically shaped, cup-shaped interior, in which the bearing 6 is accommodated for supporting the support shaft 7.
  • the transported through the holes 12 grinding dust is passed through a housing-side exhaust nozzle 14 in a dust collector, not shown.
  • This friction brake device 15 comprises a friction surface 16 on the sanding pad on the top side associated with the housing 2 and a friction brake element 17, which is firmly connected to the housing 2 and comes into frictional contact with the friction surface 16.
  • the friction brake element 17 is expediently designed as a friction ring and consists of rubber or an elastomer material, for example TPE, EPDM or NBR. Seen in cross-section, the friction ring 17 has an approximately V-shaped compensation section 18, which allows in the direction of Reibkraftbeetzschung an elastic elongation and contraction of the friction ring.
  • the friction surface 16 on the upper side of the grinding plate 8 has radially seen from the inside to the outside, so seen from the axis of rotation 11 in the direction of the radially outer edge 19 of the grinding disc a sloping cross-sectional profile.
  • This sloping course relates to a horizontal plane 20, which is perpendicular to the axis of rotation 11 of the sanding pad 8.
  • the grinding disc 8 When the eccentric grinder is idling, the grinding disc 8 can be tilted slightly out of its position with parallel axes of rotation due to bearing play and the eccentric drive, so that the axis of rotation 11 of the grinding disc is slightly inclined with respect to the axis of rotation 10 of the drive shaft 5.
  • the currently eccentrically deflected side of the sanding pad is raised by a small amount, whereby the friction surface comes into contact with the Reibbremselement 17 at this point and learns from this a frictional force that slows down the self-rotation of the sanding pad 8.
  • the friction brake element 17 presses the slightly raised sanding pad back down into a position with a parallel axis of rotation to the axis of rotation 10 of the drive shaft.
  • the individual presentation after Fig. 2 is the cone angle to take ⁇ , under which the cone-shaped portion of the friction surface 16 relative to the horizontal plane or a plane parallel thereto is inclined.
  • the conical portion of the friction surface 16 is limited to a relatively radially far outside region. It is essential that the friction surface over its entire radial Extending seen starting from the axis of rotation 11 in the radial direction outwards has a sloping course.
  • the friction surface 16 is part of a contact member 21 which is formed separately from the sanding pad 8, but connected to this and the housing 2 facing the top of the sanding pad forms. This opens up the possibility of producing the friction surface 16 from a different material than the sanding pad 8.
  • the friction surface 16 does not extend to the outer edge 19 of the grinding plate 8, but seen in the radial direction is set back relative to the outer edge 19. This is basically sufficient to ensure that the friction brake element acts on the sanding pad in the eccentrically deflected position with a frictional force.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Braking Arrangements (AREA)

Claims (6)

  1. Ponceuse excentrique, comprenant un entraînement (3) disposé dans un boîtier (2), dont l'arbre d'entraînement (5) entraîne, par le biais d'un palier excentrique (6), un arbre porteur (7) d'un disque de ponçage (8), un dispositif de frein à friction (15) étant prévu, lequel comprend un élément de frein à friction (17) disposé sur le boîtier (2) et une surface de friction (16) sur le disque de ponçage (8), laquelle peut être sollicitée par une force de friction par l'élément de frein à friction (17), la surface de friction (16) présentant sur le disque de ponçage (8), par rapport à un plan horizontal (20) s'étendant perpendiculairement à l'axe de rotation (11) du disque de ponçage (8), une allure descendant depuis l'intérieur vers l'extérieur dans la direction radiale, l'élément de frein à friction (17) étant réalisé sous forme de bague de friction, la surface de friction (16) étant disposée sur un composant de contact (21) réalisé séparément du disque de ponçage (8), lequel composant de contact est connecté au disque de ponçage (8), le composant de contact (21) étant fabriqué en un matériau différent de celui du disque de ponçage (8) et la surface de friction (16) étant décalée en arrière dans la direction radiale par rapport au bord extérieur (19) du disque de ponçage (8), la surface de friction (16) étant réalisée sous forme conique, caractérisée en ce que la surface de roulement de la surface de friction (16) possède, par rapport à l'horizontale, un angle de conicité(α) d'au moins 5°.
  2. Ponceuse excentrique selon la revendication 1, caractérisée en ce que l'élément de frein à friction (17) est réalisé de manière élastique à ressort.
  3. Ponceuse excentrique selon l'une quelconque des revendications 1 ou 2, caractérisée en ce que l'élément de frein à friction (17) présente dans la direction de la sollicitation par une force de friction une portion de compensation (18) comprimable ou extensible en longueur.
  4. Ponceuse excentrique selon l'une quelconque des revendications 1 à 3, caractérisée en ce que la surface de friction (16) se compose de plastique, par exemple de polyamide (PA), de polypropylène (PP), de polycarbonate (PC) ou de polyméthylméthacrylate (PMMA).
  5. Ponceuse excentrique selon l'une quelconque des revendications 1 à 3, caractérisée en ce que la surface de friction (16) se compose de métal, en particulier d'aluminium ou de magnésium.
  6. Ponceuse excentrique selon l'une quelconque des revendications 1 à 3, caractérisée en ce que la surface de friction (16) se compose d'un matériau moussé.
EP07822050A 2006-12-27 2007-10-30 Ponceuse excentrique Active EP2117776B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006061634A DE102006061634A1 (de) 2006-12-27 2006-12-27 Exzenterschleifer
PCT/EP2007/061696 WO2008080665A1 (fr) 2006-12-27 2007-10-30 Ponceuse excentrique

Publications (2)

Publication Number Publication Date
EP2117776A1 EP2117776A1 (fr) 2009-11-18
EP2117776B1 true EP2117776B1 (fr) 2011-12-14

Family

ID=38912639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07822050A Active EP2117776B1 (fr) 2006-12-27 2007-10-30 Ponceuse excentrique

Country Status (7)

Country Link
US (1) US8105132B2 (fr)
EP (1) EP2117776B1 (fr)
CN (1) CN101568407B (fr)
AT (1) ATE536959T1 (fr)
DE (1) DE102006061634A1 (fr)
RU (1) RU2464151C2 (fr)
WO (1) WO2008080665A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006061634A1 (de) * 2006-12-27 2008-07-03 Robert Bosch Gmbh Exzenterschleifer
JP5931084B2 (ja) * 2011-10-26 2016-06-08 ケヰテック株式会社 偏心回転軸を有する研磨具
CN103862367A (zh) * 2012-12-07 2014-06-18 郑明达 用于车用研磨机的偏心座
JP6529210B2 (ja) 2013-04-04 2019-06-12 スリーエム イノベイティブ プロパティズ カンパニー 研磨ディスクを用いる研磨方法およびこれに用いる物品
US9387578B2 (en) * 2013-10-28 2016-07-12 Black & Decker Inc. Handle arrangement for sander
CN104589189B (zh) * 2015-02-02 2017-07-14 浙江金美电动工具有限公司 双轨迹偏心结构抛光机
US20180009084A1 (en) * 2016-07-07 2018-01-11 Stone Pro Equipment Company Abrading Disc
US10632589B2 (en) 2016-08-29 2020-04-28 Black & Decker Inc. Power tool
CN107225477A (zh) * 2017-06-06 2017-10-03 浙江亚特电器有限公司 一种使用安全的圆砂机
CN110860999A (zh) * 2018-08-28 2020-03-06 中核苏阀科技实业股份有限公司 大口径闸阀闸板的双偏心带轴承自动8字平面研磨装置

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1779682A (en) * 1928-11-16 1930-10-28 Stratmore Company Surfacing apparatus
DE3906549A1 (de) 1989-03-02 1990-09-06 Bosch Gmbh Robert Exzenterschleifer
US5018314A (en) * 1989-06-08 1991-05-28 Makita Electric Works, Ltd. Sander
US5237781A (en) * 1992-03-23 1993-08-24 Kris Demetrius Hand held disc type surfacing machine
DE4233729A1 (de) * 1992-10-07 1994-04-14 Bosch Gmbh Robert Exzentertellerschleifer mit Schleiftellerbremse
GB9423848D0 (en) * 1994-11-25 1995-01-11 Black & Decker Inc Improved oscillating hand tool
US6059644A (en) * 1998-11-18 2000-05-09 3M Innovative Properties Company Back-up pad for abrasive articles and method of making
DE19941620A1 (de) * 1999-09-01 2001-03-08 Bosch Gmbh Robert Handwerkzeugmaschine
DE19952108B4 (de) * 1999-10-29 2007-09-20 Robert Bosch Gmbh Exzentertellerschleifmaschine
DE20023967U1 (de) * 2000-03-14 2008-02-28 Robert Bosch Gmbh Elektrohandschleifmaschine, insbesondere Exzenterschleifer
GB2376651B (en) * 2000-03-14 2003-05-14 Bosch Gmbh Robert Hand-held electric sanding machine,in particular eccentric sander
DE10031761A1 (de) * 2000-06-29 2002-01-10 Bosch Gmbh Robert Exzentertellerschleifmaschine mit einem zylindrischen Gehäuse
DE10126675A1 (de) * 2001-06-01 2002-12-05 Bosch Gmbh Robert Elektrohandschleifmaschine, insbesondere Exzenterschleifer
DE10148339A1 (de) * 2001-09-29 2003-04-10 Bosch Gmbh Robert Handschleifmaschine mit Schleifteller
TWM256252U (en) * 2004-03-09 2005-02-01 Ren-Ben Jang Improved structure of polishing plate
US7357701B2 (en) * 2005-04-07 2008-04-15 Dan Gautier Water driven rotary tool
DE102006061634A1 (de) * 2006-12-27 2008-07-03 Robert Bosch Gmbh Exzenterschleifer

Also Published As

Publication number Publication date
US20100062695A1 (en) 2010-03-11
EP2117776A1 (fr) 2009-11-18
RU2464151C2 (ru) 2012-10-20
CN101568407B (zh) 2013-02-06
WO2008080665A1 (fr) 2008-07-10
ATE536959T1 (de) 2011-12-15
RU2009128745A (ru) 2011-02-10
CN101568407A (zh) 2009-10-28
DE102006061634A1 (de) 2008-07-03
US8105132B2 (en) 2012-01-31

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