EP2527089B1 - Appareil de meulage manuel motorisé - Google Patents

Appareil de meulage manuel motorisé Download PDF

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Publication number
EP2527089B1
EP2527089B1 EP12163877.9A EP12163877A EP2527089B1 EP 2527089 B1 EP2527089 B1 EP 2527089B1 EP 12163877 A EP12163877 A EP 12163877A EP 2527089 B1 EP2527089 B1 EP 2527089B1
Authority
EP
European Patent Office
Prior art keywords
held
drive shaft
hand
output shaft
bearing
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.)
Not-in-force
Application number
EP12163877.9A
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German (de)
English (en)
Other versions
EP2527089A1 (fr
Inventor
Nils Braselmann
Tobias Lutz
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 EP2527089A1 publication Critical patent/EP2527089A1/fr
Application granted granted Critical
Publication of EP2527089B1 publication Critical patent/EP2527089B1/fr
Not-in-force legal-status Critical Current
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
    • B24B23/028—Angle tools
    • 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
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
    • B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
    • 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
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools

Definitions

  • the invention relates to a motor-driven hand grinder according to the preamble of claim 1.
  • a hand-held power tool in the form of an angle polisher or stone grinder known ( WO 2008/014806 A1 ), in which of an electric drive motor, an angle gear is driven as the first, the speed of the motor shaft stepping gear stage.
  • the angle gear drives a downstream planetary gear, which forms a second likewise geared gear stage and in turn drives the tool spindle.
  • the bevel gear of the bevel gear is rotationally fixed with a sleeve which is provided with an external toothing, which forms the sun gear of the planetary gear.
  • the planet carrier is rotatably connected to the output shaft.
  • a suitable fan of the drive motor whose high speed to ensure adequate cooling. A dust extraction is not available.
  • the motor-driven hand grinder according to the invention with the features in claim 1 has the advantage that due to the design of the reduction gear as planetary gear a compact and low design of the hand grinder is achievable.
  • a large volume flow can be achieved, so that the integrated vacuum is highly effective. Due to the very effective dust extraction, no additional vacuum cleaner is needed, no other device.
  • the large volume flow generated by the fan, which is loaded with Abtragpizaten and dust, can be connected via a hose z. B. are blown into a connected thereto filter device and pressed through it, wherein the dust and the Abtragpify be filtered off. It thus requires only one hand grinder. This leads to a cost saving and better space yield on the device.
  • the grinding head housing has immediately below the at least one suction fan a lower part, the z. B. is formed as a plastic injection molded part.
  • This lower part of the air deflection serving bent baffles and on the top of Sauggebläserad open pockets and a spiral space, which opens into an air outlet opening.
  • the at least one Sauggebläserad has a closed upper-side support plate and protruding from this, backward curved blades. Due to the curved guide walls of the lower part is achieved that the dust air flow is already optimally deflected before entering the Sauggebläserad.
  • the baffles serve not only to deflect the air flow but also to increase the stability of the lower part.
  • the pockets of the suction fan which are closed on the upper side by the support plate of the suction fan wheel, also contribute to the stability. Due to this closed design of the fan, the volume flow that can be generated is even increased. In another advantageous embodiment, the pockets are closed at the top by a cover, whereby the cost of the suction fan can be reduced.
  • the sun gear of the planetary gear is part of the drive shaft and the planetary gear carrier in the ring gear is rotatably connected to the output shaft.
  • the power flow runs from the driven drive shaft via the planet carrier to the output shaft.
  • the sun gear may be integral with the drive shaft, for. B. cut into this. This is very easy. Instead, the sun gear but also consist of a pinion, which is held on the drive shaft by press connection.
  • the planet carrier can be held on the Abtriebswel le by press fit. It may preferably consist of a disc, are held on the press-fit bearing pins for mounting the individual planetary gears.
  • a further advantageous embodiment provides that the drive shaft is mounted on a shaft portion by means of a bearing, in particular roller bearing, wherein preferably the inner ring of the bearing is held by press fit on the drive shaft and the outer ring of the bearing is preferably encapsulated and held by a bearing carrier.
  • the output shaft is mounted on a shaft portion between the planet carrier and the at least one sanding pad by means of one or two bearings whose inner ring is held on the output shaft by press fit and the outer ring is received in the grinding head housing and held by a bearing cap.
  • the planetary gear is contained in a gear housing connected to the grinding head housing, which has a gear cover covering the ring gear and the planetary gears and this suppresses.
  • the at least one Sauggebläserad held on the drive shaft with a press fit although instead of a holder by means of a molded seat is possible. It is preferably made of metal, for. B. aluminum, a sheet metal bent part od. Like. Instead, a design as a plastic part with injected metal bushing is possible.
  • the sanding head housing in particular the lower part, surrounds the sanding disk periphery with a radial distance with a lower edge to form an annular space therebetween, this annular space serving for edge-side suction.
  • the lower part may also contain within a downwardly open annular groove individual brush ring body or a brush ring ring, said can be resiliently mounted within the annular groove. Due to this, the respective brush ring body or brush ring adjusts to the surface situation.
  • individual gripping clips are provided on the grinder head housing, in particular on the lower part thereof, which have at least one resilient tongue with an end-like, approximately hook-shaped projection for gripping a brush holder of the brush ring ring or of the individual brush crate bodies.
  • the grinding head housing in particular the lower part, may have approximately arcuate-shaped recesses for the retaining clips, which at the same time form suction bypasses. Ambient air can thus flow into the lower hood region of the hand grinder via these recesses, as a result of which a better suction behavior can be generated.
  • the brush body surface can be freed of dust deposits during operation.
  • the grinding head housing in particular the lower part, has at least one removable wall element which can be fixed by means of a clip connection at a front peripheral region.
  • the wall element may have two spaced clip hooks, which a slot-shaped insertion opening is associated with the grinding head housing, in particular lower part, each clip hook.
  • the planetary gear is preceded by a trained as a reduction gear first gear stage, which is arranged between the drive motor and the drive shaft and reduces the engine output speed to a predetermined speed of the drive shaft with Sauggebläserad thereon.
  • This first gear stage may be formed as a bevel gear with an engine-side pinion and a gear engaged with it ring gear, which is held on the drive shaft with interference fit. Due to this design of the first gear stage, the hand grinder can be made small in height and compact. In this case, the motor housing form a handle.
  • a motor-driven hand grinder 10 is shown schematically in the form of a power tool, as it is used for floor and wall processing.
  • the hand grinder 10 can od as a cleaning machine, concrete and Esstrichschleifer, drywall grinder. Like. Hand tools are formed or used.
  • the hand grinder 10 has an only schematically indicated grinding plate 11 in a grinding head housing 12.
  • the sanding pad 11 is rotatably connected to an output shaft 13, via which the sanding pad 11 is rotatably driven in a working direction with the hand grinder 10 switched on at a speed of z. B. about 1700 U / min. With this speed, the output shaft 13 rotates.
  • the output shaft 13 is drivable by means of a drive motor, which is located in a handle 14 and not shown, via a first gear stage 15 and a drive shaft 16 with a downstream reduction gear 17 as the second gear stage.
  • the first gear stage 15 which is arranged in a gear between the drive motor and the drive shaft 16, the engine output speed, the z. B. 40000 U / min may be, to a predetermined speed of the drive shaft 16, the z. B. 11000 U / min may be reduced.
  • the first gear 15 is formed as a bevel gear with an engine-side pinion 18 and a gear engaged therewith ring gear 19 which is held on the drive shaft 16 with a press fit.
  • At least one Sauggebläserad 20 is rotatably held as part of a dust extraction, preferably with interference fit.
  • the suction fan 20 forms the impeller of a radial fan. It runs like the drive shaft 16 at a high speed z. B. of 11000 U / min and thus forms a powerful fan of an integrated dust extraction, which can promote a large volume flow z. On the order of 1600 l / min.
  • the reduction gear 17 as a second gear stage, the high speed of the drive shaft 16 in a stage of about 11000 U / min to z. B. max. 1700 rpm reduced. Also a multi-stage reduction can be provided.
  • the drive shaft 16 is mounted on at least one shaft portion 21 by means of a bearing 22, in particular a rolling bearing, wherein preferably the inner ring 23 of the bearing 22 is held with a press fit on the drive shaft 16 and the outer ring 24 of the bearing 22 is preferably encapsulated by a bearing carrier 25 and is held.
  • the bearing 22 is located axially between the ring gear 19 and the Sauggebläserad 20th
  • the reduction gear 17 is formed of a planetary gear which is disposed between the drive shaft 16 and the output shaft 13.
  • This planetary gear has a sun gear 26 which is either integral with the drive shaft 16, z. B. is cut into this, or consists of a held on the drive shaft 16 by press connection pinion.
  • the reduction gear 17 in the form of the planetary gear also has a z. B. disc-shaped planet carrier 27 which is rotatably connected to the output shaft 13, z. B. is held on this with a press fit.
  • the planet carrier 27 has, for example, three bearing pins 28 held thereon with a press fit for corresponding planetary gears 29, which rotate in the ring gear 30.
  • the center axes of the sun gear 26, the ring gear 30 and the planet carrier 27 of the reduction gear 17 extend coaxially to the drive shaft 16 and output shaft 13.
  • the output shaft 13 is mounted on a shaft portion 31 between the planet gear 27 and the at least one sanding pad 11 by means of two bearings 32, 33, whose respective inner ring is held on the output shaft 13 by press fit and their respective outer ring in a cylindrical sleeve-like part 34 of the grinding head housing 11 and held by a bearing cap 35.
  • the bearings 32, 33 may be encapsulated by a bearing carrier.
  • the grinding head housing 12 consists of a lower part 36 and an upper hood 37, which is connected to the lower part 36 and in which the Sauggebläserad 20 is arranged.
  • the cylindrical part 34 in which the two bearings 32, 33 are received, is an integral part of the lower part 36.
  • the reduction gear 17 is received in the form of the planetary gear and contained in a gear housing, the top side with a gear cover 38 Has bearing cap, which covers the ring gear 30 and the planetary gears 29 and holds down.
  • the at least one suction fan 20 is held on the drive shaft 16 with interference fit and may be formed of a plastic part with injected metal bush or instead made of metal, for.
  • the suction fan 20 has a closed top side support plate 39 and projecting from this, backward curved blades 40.
  • the lower part 36 of the grinding head housing 12 is located directly below the Sauggebläserades 20 and the air deflection serving bent baffles 41, further on the top of Sauggebläserad 20 through open pockets 42 and a spiral space 43, which opens into an air outlet opening 44. How out Fig. 1 it can be seen, in the region of the air outlet opening 44 to the grinding head housing 12, a flexible hose 45 is connected, for. B. by means of a quick coupling element.
  • the Sauggebläserad 20 has a neck 46 with which the Sauggebläserad 20 is held on the drive shaft 16 with a press fit, wherein axially to the neck 46 followed by a larger diameter stepped inner annular groove 47, the disassembly, z. B. for repair purposes.
  • annular groove 47 is a puller stop, which can be supported for disassembly on the drive shaft 16.
  • a shaft seal 48 is held to seal.
  • the drive shaft 16 is with her in Fig. 1 upper end portion by means of a local bearing 49, in particular needle bearing, stored.
  • Due to the angular gear with pinion 18 and ring gear 19 results, viewed in the axial direction of the drive shaft 16 and the output shaft 13, a compact construction with low height, wherein the housing, not shown, the drive motor housing 14 forms. It can be seen that the press connections of the ring gear 19, the inner ring 23 and the Sauggebläserades 20 are relatively easy to produce with the drive shaft 16, because these components are connected in the axial direction to stop.
  • the blade geometry is optimized in terms of efficiency.
  • the dust air flow is already optimally deflected before entering the Sauggebläserad 20. This is done by the air deflection serving curved baffles 41 of the lower part 36.
  • the lower part 36 has z. B. twelve such baffles 41. These serve not only to redirect the air flow but at the same time cause a stabilization of the receiving area for the reduction gear 17 in the form of the planetary gear. Due to the design of the baffles 41 z. B. six circumferentially distributed seats with through holes 51 are formed for screws 52 which engage in aligned screw domes 53 of the gear cover 38 for fixing this.
  • the pockets 42 formed at the base 36 enhance the stability of the base 36. Since these are open upwardly toward the suction fan 20, no sanding dust can accumulate therein during operation. To ensure this, the Sauggebläserad 30 is closed on the upper side by means of the support plate 39. This in turn has the advantage that thereby a higher volume flow can be promoted by the suction fan 20, z. On the order of 1600 l / min.
  • the grinding head housing 12, in particular the lower part 36, has a lower edge 54, with which the lower part 36 surrounds the circumference of the grinding disc 11 with a radial spacing to form an annular space 55 therebetween.
  • annular space 55 Through the annular space 55 a circumferential gap is formed, through the edge of an extraction of air, laden with dust and other Abtragp
  • the brush ring body 57 has a brush holder 58 with bristles 59 on it and that the brush holder 58 is resiliently mounted in the annular groove 56, which is schematically indicated by a spring 60. Because of this resilient storage, the brush ring body 57 adapts to the situation automatically. The spring travel of this resiliently movable brush holder 56 can also be limited by appropriate means.
  • the grinding head housing 12, in particular the lower part 36, has at least one removable wall element 62 on a front peripheral region 61. This has at both ends in respective slots 63, 64 form-fitting insertable from above engaging portions 65 and 66, respectively.
  • the inserted wall element 62 can be detachably connected to the lower part 36 by means of a clip connection.
  • the wall element 62 has two spaced resilient clip hooks 67, 68. Each of the clip hooks 67, 68 is associated with an approximately slot-shaped through opening 69, 70 in the lower part 36, into which the clip hooks 67, 68 can retract when being attached.
  • Fig. 4 shows a state in which the wall member 62 is lifted from the lower part 36 upwards.
  • the front peripheral region 61 of the local area of the grinding plate 11 is free. This allows close to the edge grinding.
  • the wall element 62 this is in Fig. 4 moved downward, wherein the engaging portions 65, 66 enter positively into the slots 63, 64 of the lower part 36.
  • the Klipshaken 67, 68 pass through the insertion opening 69, 70 by compression and spring behind them, the hook part of the Klipshaken 67, 68, the lower part 36 overlaps the underside, as in Fig. 7 is indicated.
  • the wall element 62 is also provided with a retaining clip 71 which has two resilient tongues 72, 73 with an approximately hook-shaped projection 74, 75 at the end, which is directed radially outward.
  • This projection 74, 75 engages under a respective brush holder 58 of the respective brush ring body 57, so that this thereby against falling out of the annular groove 56th is secured.
  • the abrasive body housing 12, in particular the lower part 36 has approximately arcuate recesses 76 for this Halteklipse 71, said recesses 76 also form Ansaugbypässe. Due to these bypasses ambient air can flow into the lower hood area, whereby a better Absaug is achieved and is further achieved that the surface of the brush ring body 57 are released during operation of dust deposits.
  • the described hand grinder 10 can be used with great advantage, z. B. for sanding drywall, plaster surfaces, plaster surfaces od. Like. It is also suitable for removing carpet adhesive, wallpaper scraps and similar coatings. Also can be by means of this electric hand tool z. B. create perforations of wallpaper and other similar surfaces. Also wood, paint or the like can be sanded with it. Furthermore, various surfaces can be brushed, smoothed, polished and treated in any other way by means of the hand grinder. Even a compacting of still moist plaster surfaces is possible.
  • the hand grinder 10 allows a very effective dust extraction by powerful fan. There is no need for a vacuum cleaner for dust extraction, no other device. It requires only the illustrated hand grinder 10.
  • the large volume flow generated by the fan, which is loaded with Abtragp firmwaren can, for example via the hose 45 z. B. are blown into a connected thereto filter device and pressed through it, wherein the Abtragpiety be filtered off.
  • the individual brush ring body 57 may also be provided a brush ring ring which is held spring-loaded in the same way and secured by means of the retaining clips 71 against falling down. Because of this brush ring body 57 or a single brush ring ring a very good adaptation to the surface to be machined is possible, with a quick and easy replacement can be made in case of wear or damage.

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

Claims (9)

  1. Appareil de meulage manuel (10) motorisé, comprenant au moins un disque de meulage (11) dans un boîtier de tête de meulage (12), lequel disque de meulage est relié de manière solidaire en rotation à un arbre de sortie (13) qui est entraîné au moyen d'un moteur d'entraînement par l'intermédiaire d'un arbre d'entraînement (16) avec un réducteur (17) monté en aval, et comprenant au moins une roue de ventilateur d'aspiration (20) sur l'arbre d'entraînement (16) en tant que partie d' un dispositif d'aspiration de poussière, caractérisé en ce que le réducteur (17) est formé d'un engrenage planétaire (26, 29, 27, 30) disposé en liaison d'entraînement entre l'arbre d'entraînement (16) et l'arbre de sortie (13), et en ce que l'au moins une roue de ventilateur d'aspiration (20) comprend une plaque de support (39) supérieure fermée et des pales (40) faisant saillie à partir de celle-ci et courbées vers l'arrière et le boîtier de tête de meulage (12) comprend une partie inférieure (36) immédiatement en dessous de l'au moins une roue de ventilateur d'aspiration (20), laquelle partie inférieure comprend des parois de guidage (41) courbées servant à dévier l'air ainsi que des cavités (42) ouvertes en direction de la roue de ventilateur d'aspiration (20) sur le côté supérieur et un espace spiral (43) qui débouche dans une ouverture de sortie d'air (44).
  2. Appareil de meulage manuel selon la revendication 1, caractérisé en ce que la roue solaire (26) de l'engrenage planétaire fait partie de l'arbre d'entraînement (16) et le porte-planétaire (27) supportant les roues planétaires (29) tournant dans la couronne (30) est relié de manière solidaire en rotation à l'arbre de sortie (13).
  3. Appareil de meulage manuel selon la revendication 1 ou 2, caractérisé en ce que les axes médians de la roue solaire (26), de la couronne (30) et du porte-planétaire (27) de l'engrenage planétaire s'étendent de manière coaxiale à l'arbre d'entraînement (16) et à l'arbre de sortie (13).
  4. Appareil de meulage manuel selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la roue solaire (26) fait corps avec l'arbre d'entraînement (16), par exemple est découpée dans celui-ci, ou est constituée d'un pignon maintenu sur l'arbre d'entraînement (16) par une liaison à ajustement serré.
  5. Appareil de meulage manuel selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le porte-planétaire (27) est maintenu sur l'arbre de sortie (13) par ajustement serré et est constitué de préférence d'un disque pourvu de goupilles de palier (28), qui y sont maintenues par ajustement serré, pour les roues planétaires (29).
  6. Appareil de meulage manuel selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'arbre d'entraînement (16) est supporté, au niveau d'un tronçon d'arbre (21), au moyen d'un palier (22), en particulier d'un palier à roulement, la bague intérieure (23) du palier (22) étant maintenue de préférence par ajustement serré sur l'arbre d'entraînement (16) et la bague extérieure (24) du palier (22) étant de préférence surmoulée et maintenue par un support de palier (25).
  7. Appareil de meulage manuel selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'arbre de sortie (13) est supporté, au niveau d'un tronçon d'arbre (31) entre le porte-planétaire (27) et l'au moins un disque de meulage (11), au moyen d'un ou de deux paliers à roulement (32, 33) dont la bague intérieure est maintenue sur l'arbre de sortie (13) par ajustement serré et dont la bague extérieure est reçue dans le boîtier de tête de meulage (12) et maintenue au moyen d'un couvercle de palier (35).
  8. Appareil de meulage manuel selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'engrenage planétaire est contenu dans un boîtier d'engrenage relié au boîtier de tête de meulage (12), lequel boîtier d'engrenage comprend un couvercle d'engrenage (38) recouvrant la couronne (30) et les roues planétaires (29) et maintenant celles-ci vers le bas.
  9. Appareil de meulage manuel selon l'une quelconque des revendications 1 à 8, caractérisé en ce que l'au moins une roue de ventilateur d'aspiration (20) est maintenue sur l'arbre d'entraînement (16) par ajustement serré et est constituée de préférence de métal ou d'une pièce en plastique pourvue d'une douille métallique moulée par injection.
EP12163877.9A 2011-05-27 2012-04-12 Appareil de meulage manuel motorisé Not-in-force EP2527089B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110076627 DE102011076627A1 (de) 2011-05-27 2011-05-27 Motorgetriebenes Handschleifgerät

Publications (2)

Publication Number Publication Date
EP2527089A1 EP2527089A1 (fr) 2012-11-28
EP2527089B1 true EP2527089B1 (fr) 2013-11-20

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EP12163877.9A Not-in-force EP2527089B1 (fr) 2011-05-27 2012-04-12 Appareil de meulage manuel motorisé

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DE (1) DE102011076627A1 (fr)

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CN110405560A (zh) * 2019-08-15 2019-11-05 傲基科技股份有限公司 集尘组件和墙面打磨机
CN110900400B (zh) * 2019-12-03 2021-03-19 永康市灵威电器有限公司 角磨机防尘组件
CN113245932A (zh) * 2020-02-11 2021-08-13 广东博智林机器人有限公司 腻子打磨器
CN112605813B (zh) * 2021-01-12 2022-09-13 安徽跃腾工艺制造有限公司 一种金属雕刻后去毛刺抛光除废设备
CN113084618B (zh) * 2021-03-01 2022-05-10 吾尚良品环境服务(上海)有限公司 一种环保型石材养护打磨机用的环保型打磨头

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CN201320717Y (zh) * 2008-12-25 2009-10-07 上海卓特工具有限公司 新型电磨

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CN107309755A (zh) * 2017-07-26 2017-11-03 苏州标杆知识产权运营有限公司 一种多角度打磨机
CN111673591A (zh) * 2020-06-11 2020-09-18 滕治富 一种船舶维修用打磨抛光装置

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