EP0591875B1 - Ponçeuse à plateau excentrique - Google Patents

Ponçeuse à plateau excentrique Download PDF

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Publication number
EP0591875B1
EP0591875B1 EP93115935A EP93115935A EP0591875B1 EP 0591875 B1 EP0591875 B1 EP 0591875B1 EP 93115935 A EP93115935 A EP 93115935A EP 93115935 A EP93115935 A EP 93115935A EP 0591875 B1 EP0591875 B1 EP 0591875B1
Authority
EP
European Patent Office
Prior art keywords
eccentric
shaft
bearings
bearing
grinder according
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.)
Expired - Lifetime
Application number
EP93115935A
Other languages
German (de)
English (en)
Other versions
EP0591875A1 (fr
Inventor
Günther Berger
Stefan Heess
Mario Dipl.-Ing. Frank
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 EP0591875A1 publication Critical patent/EP0591875A1/fr
Application granted granted Critical
Publication of EP0591875B1 publication Critical patent/EP0591875B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 disc grinder according to the preamble of claim 1.
  • a generic eccentric disc grinder is known, the work spindle of which is supported on the side facing away from the grinding tool by a needle bearing and on the side facing the grinding tool by a ball bearing in the housing.
  • a generic eccentric disc grinder is known from DE-OS 36 25 655. Its grinding plate is driven by a motor. The rotation of the motor is converted via an angular gear on a shaft carrying an eccentric pin into the working movement, which is composed of a rotary movement and a circular movement of the grinding plate.
  • the double-bearing shaft rotatably carries an eccentric pin at its free end. This is arranged with an eccentricity "e” rotatable to the shaft on the shaft in two roller bearings.
  • the eccentric pin is non-rotatably coupled to the grinding plate and, together with the eccentricity "e", circles around the axis of the shaft and rotates with the shaft as a result of the bearing friction.
  • the bearings between the eccentric shaft and the shaft are exposed to high, non-uniform loads. This leads to strong heat development and wear, if there is not exceptionally intensive heat dissipation, for example by means of a cooling fan.
  • the eccentric disc grinder according to the invention with the features of claim 1 has the advantage of significantly lower heat development, consequently less wear, lower weight and vibration and lower manufacturing costs, because the arrangement of the radial force absorbing bearings designed as needle bearings closer to the grinding plate and the arrangement of the Ball bearings absorbing only axial forces far from the sanding plate significantly improves the efficiency of the movement transmission and increases the service life of the device.
  • FIG. 1 shows a sectional illustration of an eccentric disc grinder according to the invention
  • FIG. 2 shows a further exemplary embodiment of an eccentric disc grinder
  • FIG. 3 shows a further developed exemplary embodiment according to FIG. 2.
  • the eccentric disc grinder 1 shown in Figure 1 has a motor housing 2 on which an electrical connection cable 3 and an on and off switch 4 are arranged.
  • An angle drive housing 5 is flanged to the motor housing 2 and contains an angle drive 7 which is operatively connected to a grinding plate 6.
  • the angular drive 7 consists of a small bevel gear 8 which sits on a motor shaft (not shown) and transmits the motor movement to a large bevel gear 9.
  • the bevel gear 9 concentrically encompasses a shaft 11 that is rotatable about an axis of rotation 10.
  • the shaft 11 is mounted in bearings 12, 13 in the angular drive housing 5 in a region facing the grinding plate and in a region facing away from the grinding plate.
  • the shaft 11 carries a fan 14.
  • the fan 14 is used for dust extraction and storage cooling and at the same time as a mass balance. It is made of light material, especially plastic with low thermal conductivity.
  • the fan 14 has on the side facing away from the shaft 11 from the axis of rotation 10 Eccentric bore 15.
  • In the bore 15 there is an eccentric pin 16 with an axis 17.
  • the axis 17 runs parallel to the axis of rotation 10 and is spaced apart with the eccentricity "e”.
  • the eccentric pin 16 is guided concentrically to the axis 17 in an upper, axial fixed bearing 18 designed as a ball bearing and in a lower needle bearing 19 which only absorbs radial forces.
  • the grinding plate 6 is screwed onto the eccentric pin 16 via a bolt 20.
  • the grinding plate 6 is provided with regularly distributed recesses 22 through which grinding dust can be extracted from the workpiece via a pipe socket 21 by means of the fan 14 or an external blower (not shown).
  • the bearings 12, 18 have an inner ring diameter of at least 5 mm, an outer ring diameter of at least 15 mm and a bearing width of at least 5 mm.
  • the bearings 13, 19 have an inner sleeve inner diameter of at least 6 mm, an outer sleeve outer diameter of at least 10 mm and a bearing width of at least 6 mm.
  • the axial distance between the bearings 12, 13 is 10 to 30 mm, the axial distance of the bearings 18, 19 is 5 to 20 mm.
  • FIG. 2 shows a motor housing 32 on which an electrical connection cable 33 and an on and off switch 34 are arranged.
  • An angular drive housing 35 is flanged to the motor housing 32 and contains an angular drive 37 operatively connected to a grinding plate 36.
  • the angular drive 37 consists of a small bevel gear 38 which sits on a motor shaft 39 and transmits the motor movement to a large bevel gear 40.
  • the large bevel gear 40 concentrically encompasses a hollow shaft 41 with an eccentric, continuous bore 42.
  • the hollow shaft 41 is mounted on its side facing away from the grinding plate 36 in an essentially axial force-absorbing ball bearing 43 and on its side near the grinding plate in an essentially only radial force-absorbing needle bearing 44 in the angular drive housing 35.
  • an eccentric shaft 45 is arranged in a second ball bearing 46 remote from the grinding plate, absorbing axial forces and in a second needle bearing 47 near the grinding plate, essentially absorbing radial forces.
  • a fan 48 is arranged on the hollow shaft 41, which serves for cooling the bearings and for dust extraction as well as for mass and unbalance compensation.
  • the grinding plate 36 is screwed on with a bolt 49.
  • the hollow shaft 41 has a central axis 50 about which it rotates.
  • the eccentric shaft 45 has a shaft axis 51 which coincides with the axis of the eccentric bore 42.
  • the axis 50 has the distance "e” from the shaft axis 51, the eccentricity with which the grinding plate 36 circles.
  • the grinding plate 36 has a plurality of dust extraction openings 52 through which the dust generated between the grinding plate 36 and the workpiece is sucked off by means of the fan 48 and transported away via a pipe socket 53.
  • a roller gear 54 is rotatably arranged that can roll on a roller track 55.
  • the bearings 43, 46 have an inner ring diameter of at least 5 mm, an outer ring diameter of at least 15 mm and a bearing width of at least 5 mm.
  • the bearings 44, 47 have an inner sleeve inner diameter of at least 6 mm, an outer sleeve outer diameter of at least 10 mm and a bearing width of at least 6 mm.
  • the axial distance between the bearings 43, 44 is 30 to 70 mm
  • the axial distance between the bearings 46, 47 is 20 to 60 mm.
  • the bevel gears 38, 40 rotate.
  • the bevel gear 40 rotates together with the hollow shaft 41 and the fan 48 about the central axis 50.
  • the shaft 45 rotates about the axis 50 taken away.
  • the distance of the central axis 50 from the shaft axis 51 determines the measure of the eccentricity "e" with which the shaft 45 and thus the grinding plate 36 is moved.
  • the exemplary embodiment of an eccentric disc grinder 61 shown in FIG. 3 shows the following parts essentially in accordance with FIG. 2: a motor housing 62 with on and off switch 64, an angular drive housing 65, a grinding plate 66, an angular drive 67, a hollow shaft 71 with an eccentric bore 72, an essentially axial force-absorbing ball bearing 73, an essentially only radial force-absorbing needle bearing 74, an eccentric shaft 75 with a second ball bearing 76 remote from the grinding plate, absorbing axial forces, a second needle bearing 77 near the grinding plate, essentially absorbing radial forces, a mass balance 78, one central axis 80, a shaft axis 81, which coincides with the axis of the eccentric bore 72, and which is arranged at a distance "e" from the axis 80, a roller gear 86 and a roller track 87.
  • the bearing 74 is a sealed needle bearing with a cover sleeve, not shown .
  • a labyrinth seal 83 is arranged between an end face 79 of the mass balance 78 and the end face of a collar 82 of the angular drive housing 65, which prevents the ingress of dust to the bearing 74 from the side of the grinding plate 66.
  • the gap between the collar 82 and the hollow shaft 71 and thus the bearing 74 is sealed against lubricant leakage by a felt ring 84 which rotates with the hollow shaft 71 to the angular drive 67.
  • the annular gap between the eccentric shaft 75 and the hollow shaft 71 in front of the needle bearing 77 on the side facing the grinding plate 66 is sealed by a felt seal 85 which is designed as a ring and which rotates with the hollow shaft 71.
  • the bearings 73, 76 have an inner ring diameter of at least 5 mm, an outer ring diameter of at least 15 mm and a bearing width of at least 5 mm.
  • the bearings 74, 77 have an inner sleeve inner diameter of at least 6 mm, an outer sleeve outer diameter of at least 10 mm and a bearing width of at least 6 mm.
  • the axial distance between the bearings 73, 74 is 30 to 70 mm
  • the axial distance between the bearings 76, 77 is 20 to 60 mm.
  • the operation and function of the eccentric disc grinder corresponds to that shown in FIG. 2.
  • the seal between the hollow shaft and the eccentric shaft is achieved in that a felt seal is arranged on the eccentric shaft in a rotationally fixed manner, a return thread being arranged on the hollow shaft. Any dust that may come in is rejected or ejected.
  • a radial shaft seal is arranged.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Claims (13)

  1. Ponceuse à plateau excentrique (1 ; 31) avec un carter (2, 5, 32, 35), en particulier en plusieurs parties, dans lequel un moteur entraîne un plateau de ponçage (6, 36) excentrique circulaire en le faisant tourner par au moins un arbre (11, 41) quidé dans des roulements (12, 13, 43, 44) et qui porte un tenon d'excentrique ou un arbre d'excentrique (16, 45), le plateau de ponçage (6, 36) pouvant tourner par rapport à l'arbre (11, 41) autour de l'axe (17, 50) du tenon d'excentrique ou de l'arbre d'excentrique (16, 45) dans des roulements (18, 19, 46, 47),
    caractérisée en ce que
    l'arbre (11, 41) et/ou l'arbre d'excentrique (16, 45) est/sont monté(s)sur leur côté tourné vers le plateau de ponçage (6, 36) dans au moins un roulement (19, 13, 47, 44) qui recueille des forces essentiellement radiales, et sur son côté situé à l'opposé du plateau de ponçage (6, 36) dans au moins un roulement (18, 12, 46, 43) qui recueille essentiellement des forces axiales, le roulement (19, 13, 47, 44) qui est disposé près du plateau de ponçage (6, 36) étant un roulement à aiguilles et l'un au moins des roulements (18, 12, 46, 43) qui sont disposés loin du plateau de ponçage (6, 36) étant un roulement à billes.
  2. Ponceuse à plateau excentrique selon la revendication 1,
    caractérisée en ce que
    l'arbre d'excentrique (45) est monté dans un alésage excentré (42) d'un arbre creux (41) ouvert aux deux extrémités.
  3. Ponceuse à plateau excentrique selon la revendication 2,
    caractérisée en ce que
    l'arbre d'excentrique (45)porte une roue à tambour (54), en particulier sur le côté qui est situé à l'opposé du plateau de ponçage (36), roue à tambour qui roule sur une ligne primitive de référence (55).
  4. Ponceuse à plateau excentrique selon l'une des revendications précédentes,
    caractérisée en ce que
    les roulements à billes (12, 18 ; 43, 46) ont un diamètre de bague intérieure d'au moins 5 mm, un diamètre de bague extérieure d'au moins 15 mm et une largeur de roulement d'au moins 5 mm.
  5. Ponceuse à plateau excentrique selon l'une des revendications précédentes,
    caractérisée en ce que
    les roulements à aiguilles (13, 19, 44, 47) ont un diamètre intérieur de manchon intérieur d'au moins 6 mm, un diamètre extérieur de manchon extérieur d'au moins 10 mm et une largeur de roulement d'au moins 6 mm.
  6. Ponceuse à plateau excentrique selon l'une des revendications 1, 4 ou 5,
    caractérisée en ce que
    la distance axiale des roulements (12, 13) de l'arbre (11) qui sont situés à l'opposé du plateau de ponçage (6, 36) l'un par rapport à l'autre atteint 10 à 30 mm, la distance axiale des roulements (18, 19) de l'arbre d'excentrique (16) qui sont situés du côté du plateau de ponçage (6, 36) l'un par rapport à l'autre atteint 5 à 20 mm.
  7. Ponceuse à plateau excentrique selon l'une des revendications 2, 3, 4 ou 5,
    caractérisée en ce que
    la distance axiale des roulements (46, 47) qui servent d'appui à l'arbre d'excentrique (45) l'un par rapport à l'autre atteint 30 à 70 mm, et la distance axiale des roulements (46, 47) qui servent d'appui à l'arbre (41), l'un par rapport à l'autre atteint 20 à 60 mm.
  8. Ponceuse à plateau excentrique selon l'une des revendications précédentes,
    caractérisée en ce que
    l'arbre (11 ; 41) porte un ventilateur (14, 48) en une matière légère, en particulier en matière plastique avec une faible conductibilité thermique, et sert de préférence de masse d'équilibrage.
  9. Ponceuse à plateau excentrique selon l'une des revendications précédentes,
    caractérisée en ce que
    l'axe du moteur s'étend perpendiculairement à l'arbre d'excentrique (16 ; 45).
  10. Ponceuse à plateau excentrique selon l'une des revendications précédentes,
    caractérisé en ce que
    l'axe du moteur s'étend parallèlement à l'arbre d'excentrique (16, 45).
  11. Ponceuse à plateau excentrique selon l'une des revendications 2 à 10,
    caractérisée en ce que
    le roulement à aiguilles (74, 77) de l'arbre (71) ou l'arbre d'excentrique (75) est un roulement à aiguilles rendu étanche, en particulier par un disque de recouvrement.
  12. Ponceuse à plateau excentrique selon la revendication 11,
    caractérisée en ce que
    le roulement à aiguilles (74) de l'arbre (71) est rendu étanche sur le côté tourné vers le plateau de ponçage (66) par une garniture d'étanchéité à labyrinthe (83) entre l'arbre creux (71) et le carter de l'engrenage d'angle (65) et est rendu étanche sur le côté qui est situé à l'opposé du plateau de ponçage (66) par une garniture d'étanchéité en feutre (84) qui tourne en même temps.
  13. Ponceuse à plateau excentrique selon les revendications 11 ou 12,
    caractérisée en ce que
    le roulement à aiguilles (74) de l'arbre (71) est rendu étanche sur le ôté situé à l'opposé du plateau de ponçage (66) par une bague en feutre (84), disposée de façon à pouvoir essentiellement tourner par rapport à l'arbre d'excentrique (75) et/ou au moins une bague radiale d'étanchéité.
EP93115935A 1992-10-07 1993-10-02 Ponçeuse à plateau excentrique Expired - Lifetime EP0591875B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4233727A DE4233727A1 (de) 1992-10-07 1992-10-07 Exzentertellerschleifer
DE4233727 1992-10-07

Publications (2)

Publication Number Publication Date
EP0591875A1 EP0591875A1 (fr) 1994-04-13
EP0591875B1 true EP0591875B1 (fr) 1997-07-16

Family

ID=6469860

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93115935A Expired - Lifetime EP0591875B1 (fr) 1992-10-07 1993-10-02 Ponçeuse à plateau excentrique

Country Status (3)

Country Link
US (1) US5425666A (fr)
EP (1) EP0591875B1 (fr)
DE (2) DE4233727A1 (fr)

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US7722444B2 (en) 2005-05-13 2010-05-25 Black & Decker Inc. Angle grinder

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GB9423848D0 (en) * 1994-11-25 1995-01-11 Black & Decker Inc Improved oscillating hand tool
DE19513383C2 (de) * 1995-04-08 1997-11-20 Supfina Grieshaber Gmbh & Co Vorrichtung zum beidseitigen Feinstbearbeiten oder Superfinishen von scheibenförmigen Werkstücken
US5595531A (en) * 1995-07-26 1997-01-21 Ryobi North America Random orbit sander having speed limiter
US5823862A (en) * 1997-02-21 1998-10-20 Dynabrade, Inc. Dual action sander
GB9809030D0 (en) * 1998-04-29 1998-06-24 Black & Decker Inc Powered oscillating hand tool
US6213851B1 (en) * 1998-07-07 2001-04-10 Delta International Machinery Corp. Abrading apparatus
US6758731B2 (en) * 2001-08-10 2004-07-06 One World Technologies Limited Orbital sander
US7022002B2 (en) 2004-03-03 2006-04-04 Dynabrade, Inc. Modular counterweight apparatus for an orbital abrading machine
US7785173B2 (en) * 2005-07-05 2010-08-31 Supfina Machine Co. Superfinishing machine and method
US20070141962A1 (en) * 2005-12-19 2007-06-21 Dodd Harry D Method for grinding a workpiece
US20080012453A1 (en) * 2006-07-17 2008-01-17 Abeo, Llc Motor having a hollow drive shaft
DE102006054265B3 (de) 2006-11-17 2008-04-10 Festool Gmbh Handwerkzeugmaschine
DE102007008658A1 (de) * 2007-02-20 2008-08-21 Flender Industriegetriebe Gmbh & Co. Kg Kegelradgetriebe, insbesondere Kegelstirnradgetriebe
DE102007018466A1 (de) * 2007-04-19 2008-10-23 Robert Bosch Gmbh Motorisch angetriebene Werkzeugmaschine
ES2332568B1 (es) * 2008-07-23 2011-04-18 Airbus Operations, S.L. Sistema de repasado orbital post-afeitado de remaches.
CN201563409U (zh) * 2009-09-15 2010-09-01 南京德朔实业有限公司 电动剪刀
DE102010027205A1 (de) * 2010-07-06 2012-01-12 C. & E. Fein Gmbh Handwerkzeug
DE102010046629A1 (de) * 2010-09-17 2012-03-22 C. & E. Fein Gmbh Handwerkzeug
DE102012201593A1 (de) * 2012-02-03 2013-08-08 Robert Bosch Gmbh Handwerkzeugmaschinenvorrichtung
JP2014079874A (ja) * 2012-09-26 2014-05-08 Makita Corp 動力工具
DE102013100085A1 (de) * 2013-01-07 2014-07-10 C. & E. Fein Gmbh Oszillierend angetriebene Werkzeugmaschine
DE102013104271A1 (de) * 2013-04-26 2014-10-30 C. & E. Fein Gmbh Werkzeugmaschine
DE102013218434B4 (de) * 2013-08-08 2021-03-04 Magna powertrain gmbh & co kg Lagerung
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch
JP7117832B2 (ja) * 2017-07-24 2022-08-15 京セラインダストリアルツールズ株式会社 ポリッシャ
US10971966B2 (en) 2018-05-14 2021-04-06 Black & Decker Inc. Power tool with partition assembly between transmission and motor
US11813729B2 (en) 2018-05-14 2023-11-14 Black & Decker Inc. Power tool with partition assembly between transmission and motor
EP3646987B1 (fr) * 2018-10-29 2023-06-14 Guido Valentini Outil électrique de ponçage ou de polissage orbital aléatoire portatif, guidé à la main
CN109333346B (zh) * 2018-11-29 2023-09-12 东莞市凯保精密机械有限公司 中心注水式打磨机
EP3693132B1 (fr) * 2019-02-08 2023-09-06 Guido Valentini Outil électrique de ponçage ou de polissage orbital aléatoire guidé à la main portatif

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
US7722444B2 (en) 2005-05-13 2010-05-25 Black & Decker Inc. Angle grinder
US8087977B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Angle grinder
US8087976B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Trigger assembly for angle grinder

Also Published As

Publication number Publication date
EP0591875A1 (fr) 1994-04-13
DE59306919D1 (de) 1997-08-21
US5425666A (en) 1995-06-20
DE4233727A1 (de) 1994-04-14

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