EP1819482A1 - Machine-outil manuelle entrainee par la circulation d'une substance - Google Patents

Machine-outil manuelle entrainee par la circulation d'une substance

Info

Publication number
EP1819482A1
EP1819482A1 EP05803355A EP05803355A EP1819482A1 EP 1819482 A1 EP1819482 A1 EP 1819482A1 EP 05803355 A EP05803355 A EP 05803355A EP 05803355 A EP05803355 A EP 05803355A EP 1819482 A1 EP1819482 A1 EP 1819482A1
Authority
EP
European Patent Office
Prior art keywords
turbine wheel
hand tool
turbine
tool according
housing
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Withdrawn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
EP05803355A
Other languages
German (de)
English (en)
Inventor
Frank Fuchs
Cristian-Aurelian Coclici
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 EP1819482A1 publication Critical patent/EP1819482A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • 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

Definitions

  • the invention relates to a fluid-powered hand tool according to the preamble of claim 1.
  • the invention with the features of claim 1 has the advantage that operated without own electric motor, only with the suction of a vacuum cleaner designed as a grinding machine hand tool for your applications has such a high efficiency that particularly much flow energy of the suction or blowing air into mechanical Performance is feasible and a virtually dust-free grinding, drilling or the like. With constant removal of dust particles forming during the grinding process is secured, so that high chip removal is combined with highly effective extraction of the grinding dust, in short, it is created a particularly advantageous variety of a turbine - Almost as a hybrid between classically flowed through radial turbine and axial turbine - which is configured as a diagonal radial turbine.
  • the hand tool is particularly light and handy.
  • the housing of the power tool consists of tube-like parts that can be connected to one another via flanges, it is particularly dimensionally stable and robust at a low dead weight.
  • FIG. 3 shows a side view of the turbine according to FIG. 2
  • FIG. 4 shows a side view of the turbine wheel of the turbine according to FIG. 2
  • FIG. 5 shows a longitudinal section of the turbine wheel according to FIG. 4
  • FIG. 6 shows a side view of the turbine according to FIG. 2
  • Figure 7 is a bottom view of the turbine wheel
  • Figure 8 is a plan view of the Vorleitgitters
  • FIG. 9 a side view of the turbine wheel with inserted axle shaft
  • FIG. 10 a spatial side view of the turbine wheel obliquely from below
  • FIG. 11 a spatial side view of the turbine wheel obliquely from above.
  • Figure 1 shows a hand tool 10, which is designed as an orbital sander with a view of the viewer with its inside facing housing shell
  • the housing 12 is assembled from the two housing shells with screws, which pass through the outer, not shown housing shell from the outside, are rotatable in ringdome 35 and thereby hold together the two housing shells on a butt joint .
  • Das Housing 12 goes on its upper side 20 in a transversely projecting from the vertical axis 13, hollow cylindrical handle 16, which serves as Saugluftaustritt 18.
  • the housing 12 On its upper side 20, the housing 12 carries a louver 22, which releases or closes an opening 24 to the flow channel 26 in the interior of the housing 12 for the purpose of air inlet regulation as needed.
  • a region 86 of a channel wall 28 is perforated closely adjacent to the opening 24, so that the suction air in the hose-like flow channel 26 can communicate with the outside air.
  • the channel wall 28 is supported by support ribs 30 on the housing shells 14.
  • the support ribs 30 are connected to reinforcing ribs 32 in the interior of the housing shell 14 and via this with the housing outer wall or the housing shell 14.
  • the housing 12 terminates in a straight peripheral bottom edge 34 which, in its vertical downward projection, forms a triangle with outwardly arched sides.
  • a grinding plate 70 is arranged, which is connected via elastic oscillating body 75 to the housing 12 elastically movable.
  • the sanding pad 70 protrudes with its ironing base on the outside beyond the triangular, vertically downwardly projected contour of the lower edge 34 and has on - A -
  • each point of the sanding disc and thus each individual abrasive grain of the sanding sheet describes small circles, the typical microsection of an orbital orbital sander.
  • the axle shaft 72 is driven in rotation by a turbine wheel 38 of an air-driven turbine 36 and is rotatably mounted in the housing 12 or in the guide grille 74 via an upper and a lower roller bearing 64, 66 and engages with its lower end in a third roller bearing 68, with its outer ring rotatably seated in the sanding pad 70. Between the lower and the third roller bearings 66, 68, the axle shaft 72 is rotatably connected to a balancing mass 78, which serves as an unbalance compensation, to keep vibrations of the eccentrically moving sanding pad 70 from the housing 12.
  • the balancing mass 78 carries on its upper, the Vorleitgitter 74 side facing upwardly projecting annular profile 80. This is embraced above by an annular groove 82 with a small distance, which is arranged in the closely adjacent bottom of the Vorleitgitters 74 and 80 together with the Ringprofll a lower, labyrinth-shaped seal seal forms. This prevents dust and chips from being moved into the gap or to the lower bearing 66 as a result of the negative pressure in the cavities in the interior of the handheld power tool 10, in particular between the leveling compound 78 and the precut grid 74, so that this remains unimpaired in the long term.
  • the axle shaft 72 is circumferentially surrounded by the turbine wheel 38 rotatably, wherein an intimate positive connection between the two parts by knurling 73 in a defined peripheral region is made approximately in the middle of the axle shaft 72, in the wells of the casting process liquid plastic enters and thus the Connection causes.
  • the turbine wheel 38 has a bell-shaped outer contour, wherein the lower edge
  • Vorleitgitter 74 with grid blades 75 connects.
  • the grate blades 75 are like the paddles 42 of the turbine wheel 38 configured as standing on its narrow side plastic strip.
  • Vorleitgitter 74 is at least partially overlapped by the also in the housing 12 rotatably fixed turbine housing 60 at a distance from the height of the grate blades 75, so that thus a lower continuation of the annular flow channel 49 of the turbine wheel 38 is formed through which the suction air is drawn or passed , Via the grate blades 75, the suction air flowing in from below to drive the turbine wheel 38 in the flow direction or the flow channel 49 and the vanes 42 of the turbine 38 is directed and Entwirbelt, thereby significantly improved, in particular the input side, efficiency of the turbine 36 becomes.
  • the Vorleitgitter 74 forms with a central recess 76 on its underside a bearing seat for a bearing 66 of the lower portion of
  • Axle shaft 72 which defines this in the housing 12 and leads.
  • Figure 2 shows a longitudinal section of the turbine wheel 38 with the axially downwardly following, fixed in the housing 12 Vorleitgitter 74 as a detail, which are shown assembled in Figure 1. It is - similar to the compact one
  • Citrus squeezer - a frustoconical outwardly arched cone 48 recognizable, the outside carries a plurality of paddles 42, which have the shape with its narrow side on the support cone 48 standing arranged, flat plastic strips and their height gradually increases toward the - virtual - cone point.
  • an annular cross-section flow channel 49 is formed between the support and the deck cone 48, 44. This is divided by the paddles 42 into a plurality of twisted individual channels, in which the suction air can flow to drive the turbine 36 with a particularly low flow resistance.
  • the lower edge of the support cone 48 is approximately below 45 °
  • the inflow angle of the blade is 40 ° and its outflow angle is 30 °.
  • a movement arrow 62 shows that the air flowing along the paddle wheel 42 is deflected by 45 °, measured to the axis 40, wherein the
  • the deck cone 44 adjoins the top of the virtual cone tip 46 with a minimum distance to the channel wall 28 of the air channel 26, through which the suction air is streamlined out to the vacuum source or the vacuum cleaner.
  • the support cone 48 or truncated cone of the turbine wheel 38 is of a central
  • Hollow cylinder 54 penetrated to receive the axle bolt 72.
  • the hollow cylinder 54 forms a projecting, annular collar 52 at the top in the region of a virtual cone tip.
  • the hollow cylinder 54 reaches such a length that the axle shaft 72, with a defined axial projection and defined area of its knurling 73, secured to the turbine wheel with this knurling 73 in the interior of the Hollow cylinder 54 is positioned and is encompassed by this, so that a secure rotational lock between the turbine wheel 38 and the axle shaft 72 is achieved.
  • the truncated cone cone 44 which becomes increasingly concave in the direction of the virtual tip, bears on its in the lower third of its height
  • annular sealing bead 56 This is provided for axial engagement in a cross-ring groove 57 which is disposed on the turbine wheel 38 facing inside of the shell-like turbine housing 60 by engaging the sealing bead 56 acts as an upper labyrinth seal 51, and pressure losses in the interior of the turbine 36th prevented and thus significantly increases their efficiency.
  • the contact of the radial turbine wheel 38 and the abrasive grate 74 with abrasive dust-laden air may result in a grinding and dusting effect which may affect the performance of the drive and its life.
  • the surfaces in contact with the intake air are structured, in particular, by small, regular golf ball-like recesses, so that they have a small flow resistance with increased surface strength.
  • the side view of the turbine 36 shown in Figure 3 of Figure 2 can be particularly clear as a detail the turbine housing 60, the rotatably supported in the housing 12 and locked to support ribs 30 and clamped the Vorleitgitter 74 and the turbine 38 tightly engages over, in particular already above explained, upper labyrinth seal 51 forms.
  • Figure 6 shows a side view of the turbine wheel 38 with Vorleitgitter 74, wherein the grating blades 75 in their oblique course on the curved support ring 77, outside supported by the support ring 79, can be seen.
  • Figure 7 shows a bottom view of the turbine wheel 38, with the support ring 88, the inner support ribs 92 and outer support ribs 90 being visible and their wall thickness progressively decreasing when viewed radially from the inside out - for casting benefits.
  • Figure 8 shows a plan view of the Vorleitgitters 74 with a view of the inner support ring 77, the grate blades 75 with an entrance angle of 78 ° and the outer support ring 79th
  • Figure 9 shows a side view of the turbine wheel 38 with inserted axle shaft 72, wherein the knurling 73 is highlighted.
  • Figure 10 shows a spatial side view of the turbine wheel 38 without deck cone 44 obliquely from below, the course of the paddles 42 on the support cone 48 and below the support ring 88, the inner outer support ribs 90, 92 and their different wall thickness can be seen.
  • Figure 11 shows a spatial side view of the turbine wheel 38 obliquely from above without deck cone 44 obliquely from above, the course of the paddles 42 are particularly clearly visible on the support cone 48 .
  • the hand tool - similar to the previous embodiments - carries their housing a wireless switch that communicates with a vacuum cleaner associated counter switch and with the switching on and off of the vacuum cleaner and thus the hand tool is conveniently and inexpensively.
  • the air that flows through the power tool 10 does not flow radially inwardly as in a conventional radial turbine before it is axially deflected again in the turbine 36, but flows in both the pilot and in the radial turbine at about 45 degrees to the axis of rotation (see Pictures 3 and 4).
  • This skew flow has the advantage that the efficiency of the turbine is significantly increased since the pressure loss within the turbine 36 and the pilot grate 74 is minimized.
  • the inflow angle of the blade is 60 ° and the outflow angle is 30 ° to keep the outflow losses as low as possible.
  • Inlet areas can vary between 0 ° and 70 ° and the angles in the outlet area can vary between 10 and 60 °.
  • the choice of angles depends on both the amount of air and the expected speed.
  • the Vorleitgitter 74 has the task of imparting the largest possible Vordrall the air flow, and for this reason has grids 75 with an exit angle of 78 ° ( Figure 8).
  • the paddles 42 of the turbine wheel 38 on the support cone 48 are slightly forward and in contrast to the grid blades 75 pulled slightly backwards ( Figure 4 and 6). This whistling between the wheel and the grating blades 42, 75 are prevented, as they sweep past each other with a distance of only 0.5 mm and effectively 'smeared'.
  • the small distance between Vorleitgitter 74 and turbine 36 is necessary so that the turbine 36 can be ideally flowed.
  • An additional support ring 88 between the support ribs 90 at the bottom of the support cone 48 prevents a highly fluctuating and uncontrolled idling speed of the turbine, which can assume very high values (> 20 000 U / min), as a fan effect by purely radially arranged ribs do not occur with it can.
  • Support ring 88 and the support ribs 90 are dimensioned increasingly thin from radially inside to outside, so that during injection molding, the material quickly and with little resistance from the inside out flow and can fill all the cavities of the mold.
  • the additional collar 52 on the inner ring of the turbine wheel 38 is necessary so that the inserted or overmoulded axle shaft 72 can be knurled in the middle. For knurled shafts, it must be ensured during manufacture that they remain as symmetrical as possible, so that incorrect insertion can not occur (FIGS. 1, 9, 10, 11). The lower
  • Bearing 66 is integrated for reasons of space directly into the guide rail 74 and allows a flat design of the power tool 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles For Electric Vacuum Cleaners (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

La présente invention concerne une machine-outil manuelle comprenant un boîtier (12) et un outil (70) qui est disposé pour pouvoir être entraîné en rotation et/ou en oscillation et qui selon l'invention peut fonctionner au moyen d'une circulation d'air d'aspiration, en particulier au moyen d'un aspirateur. La machine-outil est rendue particulièrement efficace par la présence en tant que système d'entraînement, d'une turbine (36) qui comprend une roue de turbine (38) et présente des moyens pour stabiliser l'air entrant et sortant, en particulier une grille pré-directrice (74) et/ou une grille post-directrice, le flux d'air qui parcourt la roue de turbine (38), poursuivant son acheminement ou étant dévié en formant un angle aigu par rapport à l'axe vertical (40) de la roue de turbine (38), en particulier un angle inférieur à 50°.
EP05803355A 2004-12-03 2005-10-13 Machine-outil manuelle entrainee par la circulation d'une substance Withdrawn EP1819482A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004058581A DE102004058581A1 (de) 2004-12-03 2004-12-03 Handwerkzeugmaschine
PCT/EP2005/055230 WO2006058806A1 (fr) 2004-12-03 2005-10-13 Machine-outil manuelle entrainee par la circulation d'une substance

Publications (1)

Publication Number Publication Date
EP1819482A1 true EP1819482A1 (fr) 2007-08-22

Family

ID=35478795

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05803355A Withdrawn EP1819482A1 (fr) 2004-12-03 2005-10-13 Machine-outil manuelle entrainee par la circulation d'une substance

Country Status (5)

Country Link
US (1) US20090017738A1 (fr)
EP (1) EP1819482A1 (fr)
CN (1) CN101068658A (fr)
DE (1) DE102004058581A1 (fr)
WO (1) WO2006058806A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101708589B (zh) * 2009-11-07 2012-01-25 何钢亮 气动涡轮式手持高扭矩磨机
ITMI20111434A1 (it) * 2011-07-29 2013-01-30 Guido Valentini Platorello a doppia camera di aspirazione
KR20150015229A (ko) * 2013-07-31 2015-02-10 삼성전자주식회사 디스플레이 장치 및 제어 방법
DE102013222313A1 (de) 2013-11-04 2015-05-07 Robert Bosch Gmbh Gerätesystem
US10293472B2 (en) * 2014-05-16 2019-05-21 Robert Bosch Tool Corporation Speed limiting governor of a rotating shaft in air
DE102016009961A1 (de) * 2016-08-16 2018-02-22 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Verfahren zum Bestimmen der Position eines Fahrzeugs und Computersystem dafür
DE102017206975A1 (de) * 2017-04-26 2018-10-31 Robert Bosch Gmbh Zubehörvorrichtung für eine Handwerkzeugmaschine
CN113245956B (zh) * 2021-06-11 2022-08-02 中国科学院长春光学精密机械与物理研究所 一种具备公自转的主动射流抛光方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19917693A1 (de) * 1999-04-20 2000-10-26 Benjamin Blumenschein Vorrichtung zum schnelldrehenden Antrieb eines Werkzeugs
DE19932101A1 (de) * 1999-07-09 2001-01-11 Wolfgang Kofink Schleifklotz mit Saugluftantrieb
US6347985B1 (en) * 2000-06-22 2002-02-19 Michael Loveless Low profile vacuum driven sander

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006058806A1 *

Also Published As

Publication number Publication date
US20090017738A1 (en) 2009-01-15
CN101068658A (zh) 2007-11-07
DE102004058581A1 (de) 2006-06-08
WO2006058806A1 (fr) 2006-06-08

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