EP0963278B1 - Motorisch angetriebenes handaggregat - Google Patents
Motorisch angetriebenes handaggregat Download PDFInfo
- Publication number
- EP0963278B1 EP0963278B1 EP98906813A EP98906813A EP0963278B1 EP 0963278 B1 EP0963278 B1 EP 0963278B1 EP 98906813 A EP98906813 A EP 98906813A EP 98906813 A EP98906813 A EP 98906813A EP 0963278 B1 EP0963278 B1 EP 0963278B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bearing
- axial
- shaft
- hand
- sealing element
- 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
Links
Images
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
- B24B23/04—Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/008—Cooling means
Definitions
- the invention is based on a motor-driven Hand unit according to the preamble of claim 1.
- Such Hand unit is known from GB 1 226 062 A.
- the Hand unit is e.g. designed as an orbital sander.
- the shaft is driven by the rotating fan wheel Grinding dust generated by surface treatment through openings in a sanding plate and in the sandpaper held on it sucked into and out of a dust chamber via an outlet opening into a connected container submitted.
- the bearing is on the fan wheel facing Axial side directly exposed to dust in the dust room. As a result, the bearing clogs up with dust relatively quickly, which makes storage inadequate and the lifespan of the camp is significantly reduced.
- the motor-driven hand-held unit according to the invention with the features of claim 1 has the following compared to the prior art according to GB 1 226 062 A. Benefits. Due to the circumferential axial sealing element sealed the bearing to the dust chamber so that neither dust any bearing grease can get into the bearing Bearing can escape and get into the dust chamber. The The service life of the bearing is considerably increased.
- the one with the axial sealing element, especially the flexible at least one Sealing lip, contacting surface of the bottom part untreated, e.g. B. unprocessed, preferably greased is.
- the bearing in particular Deep groove ball bearings, touching on both sides or has non-contact integrated sealing washers that especially sit on the outer ring and in relation to the axial end face of the inner ring further inside and with Distance from it.
- the shaft with this revolving disc can be arranged on the facing End face of the inner ring and the integrated sealing washer of the bearing with at least little Axial distance radially covered.
- the disc is formed from a thin sheet and if the disc and over this the inner ring of the bearing secured axially on the shaft by means of a locking ring is. This results in a simpler and more cost-effective way Way a seal of the bearing on the opposite Axial side, where in the design of the hand unit as Grinder less dust.
- the shaft on the axial sealing element facing away from the axial side of the fan wheel a z. B. carries eccentric sleeve on the - z. B. by means of an associated sleeve-shaped inner ring - via a bearing a grinding plate is rotatably mounted.
- the warehouse the sanding plate can be formed from an open needle sleeve and on the axial side facing the fan wheel axially sealed by means of at least one sealing element be designed as a radial shaft sealing ring.
- two radial shaft seals are provided, which are arranged axially one behind the other.
- the at least one sealing element of the bearing can be used as in cross section approximately corresponding to a lying U, two striving sealing lips carrying sealing ring formed his. This is a dust seal in a simple manner of the bearing assigned to the grinding plate on that of the dust chamber facing axial side reached.
- a motor-driven hand tool 1 and 2 is a motor-driven hand tool 1, in particular grinding device, e.g. B. Orbital sander, shown which has a housing 2, in its upper housing part 12 an electric motor 3 is included, which has a for this purpose, coaxial shaft 10 is designed as an oscillating member Grinding plate 11 drives.
- the shaft 10 is in the housing part 12 stored by means of a bearing 13.
- the housing part 12 surrounds a fan wheel 14 in this hand tool within a dust space 15 delimited by the housing part 12 is located and rotatably on the shaft 10 by means of a sleeve 18 is arranged so that it rotates with the shaft 10.
- the Bearing 13 is located outside of the dust chamber 15 and is in an approximately cup-shaped receptacle 16 of the housing part 12 recorded such that a bottom part 17 of the receptacle 16 the Bearing 13 covers on the side facing the fan wheel 14 is, the bottom part 17 has a passage 19, through which the shaft 10 extends with the sleeve 18.
- the bearing 13 is designed, for example, as a deep groove ball bearing, the outer ring 20 of which is held non-rotatably in the approximately cup-shaped receptacle 16 and can be axially supported on the bottom part 17 thereof.
- the inner ring 21 sits on the shaft 10 in a rotationally fixed manner.
- the bottom part 17 is dimensioned such that it extends radially approximately to the inner ring 21.
- the bearing 13, in particular in the form of a ball groove bearing, is sealed on the axial side which faces the fan wheel 14 with respect to the fan wheel 14 by means of an axial sealing element 30 which runs together with the shaft 10 and the sleeve 18.
- the sealing element 30 is formed from an annular, flexible and in particular rubber-elastic shaft seal and has a sealing body 31 and a flexible sealing lip 32, which are integral with one another.
- the sealing lip 32 strives on an axial side from the sealing body 31 approximately in the shape of a truncated cone and is elastically movable relative to the sealing body 31.
- the sealing element 30 is tensioned on the shaft 10 or on the sleeve 18 and held in an elastically clamping manner.
- the radial dimensioning of the sealing element 30 is selected such that the sealing element 30 seals the passage 19 of the base part 17 with respect to the dust chamber 15.
- the sealing element 30 rests elastically on the base part 17 with its axial side facing the base part 17.
- the sealing lip 32 projects in the direction of the base part 17 and its surface 22, the sealing lip 32 preferably having a slight prestress on the surface 22 of the base part 17 is present. In this way, there is at least a slight contact pressure of the sealing lip 32. Because of the mobility of the sealing lip 32, tolerances, misalignments, angular deviations or the like, in particular of the base part 17, are compensated for by this.
- the sealing lip 32 provides a good seal in the axial direction, namely a sealing of the bearing 13 with respect to the dust chamber 15. When the shaft 10 rotates, the sealing lip 32 is relieved somewhat by the centrifugal force, as a result of which the friction at the contact point with the base part 17 and thus the wear of the sealing lip 32 is reduced.
- the housing part 12 is preferably made of light metal and in particular from die-cast aluminum.
- the one with the flexible sealing lip 32 in contact surface 22 the bottom part 17 is untreated, e.g. raw gray.
- This surface 22 does not have to be polished.
- the surface 22 is only greased, whereby the friction in the area of the contact surface with the Sealing lip 32 is reduced.
- the bearing 13, in particular deep groove ball bearings, has on both sides integrated therein, only indicated schematically in FIG. 2 Sealing discs 23 and 24, which in particular on Outer ring 20 sit and in relation to the axial end face 25 or 26 of the inner ring 21 further inside and at a distance run away.
- Sealing discs 23 and 24 On the shaft 10 is on the axial side of the bearing 13, which faces away from the axial sealing element 30 is, in the drawing above, a disc 27 e.g. out thin sheet rotatably arranged, which rotates with the shaft 10.
- the disc 27 lies on the facing end face 26 of the inner ring 21 and radially covers the integrated Sealing disk 24 with at least a small axial distance, see above that between the rotating disc 27 and the non-rotating Sealing disc 24 there is no friction.
- a locking ring 28 via which Disc 27 and the latter, the inner ring 21 of the bearing 13 is axially secured on the shaft 10.
- the disc 27 acts as a centrifugal disc, the axial sealing of the bearing 13 is sufficient on this side is.
- the shaft 10 supports the axial sealing element 30 Axial side of the fan wheel 14 facing away from e.g. eccentric Sleeve 40, on the by means of an associated, sleeve-shaped Inner ring 41 via a bearing 42 Sanding plate 11 is rotatably mounted.
- the camp 42 of the Sanding plate 11 is in the embodiment shown an open needle sleeve and on the axial side, which faces the fan wheel 14 by means of at least one Sealing element 43 axially sealed between the grinding plate 11 and the sleeve-shaped inner ring 41 is effective.
- the sealing element 43 is designed as a radial shaft sealing ring, in the embodiment shown, two of the same type Radial shaft seals are provided axially are arranged one behind the other.
- Another, not The embodiment shown is the at least one sealing element 43 than approximately U-shaped in cross-section, two striving sealing ring carrying sealing ring formed, one of which has a sealing lip as a sealing sealing lip acts and the other sealing lip acts as a dust lip.
- the bearing is formed by the at least one sealing element 43 42 on the area facing the fan wheel 14 with respect to the Dust chamber 15 and dust accumulating there in a simple manner sealed.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Of Bearings (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
- Fig. 1
- einen schematischen axialen Längsschnitt eines Schwingschleifers,
- Fig. 2
- einen vergrößerten Ausschnitt aus Fig. 1.
Das Lager 13, insbesondere in der Ausbildung als Kugelrillenlager, ist auf der Axialseite, die dem Lüfterrad 14 zugewandt ist, in Bezug auf das Lüfterrad 14 mittels eines axialen Dichtungselements 30 abgedichtet, das zusammen mit der Welle 10 und der Hülse 18 läuft. Das Dichtungselement 30 ist aus einer ringförmigen, flexiblen und hierbei insbesondere gummielastischen Wellendichtung gebildet und weist einen Dichtungskörper 31 und eine flexible Dichtlippe 32 auf, die miteinander einstückig sind. Die Dichtlippe 32 strebt auf einer Axialseite vom Dichtungskörper 31 etwa umgekehrt kegelstumpfförmig ab und ist relativ zum Dichtungskörper 31 elastisch bewegbar. Das Dichtungselement 30 ist auf der Welle 10 bzw. auf der Hülse 18 mit Vorspannung aufgezogen und elastisch klemmend gehalten. Die radiale Bemessung des Dichtungselements 30 ist so gewählt, daß das Dichtungselement 30 den Durchlaß 19 des Bodenteils 17 gegenüber dem Staubraum 15 abdichtet. Das Dichtungselement 30 liegt mit seiner dem Bodenteil 17 zugewandten Axialseite am Bodenteil 17 elastisch an. Dadurch ist der Durchlaß 19 dicht verschlossen, ohne daß ein etwaiger Luftspalt verbleibt. Aufgrund der Anlage reibt das mit der Welle 10 umlaufende Dichtungselement 30 auf der zugewandten Oberfläche 22 des Bodenteils 17. Die Dichtlippe 32 steht in Richtung zum Bodenteil 17 und dessen Oberfläche 22 über, wobei die Dichtlippe 32 vorzugsweise mit geringer Vorspannung an der Oberfläche 22 des Bodenteils 17 anliegt. Auf diese Weise herrscht ein zumindest geringer Anpressdruck der Dichtlippe 32. Aufgrund der Beweglichkeit der Dichtlippe 32 werden von dieser Toleranzen, Fluchtungsfehler, Winkelabweichungen od dgl., insbesondere des Bodenteils 17, ausgeglichen. Die Dichtlippe 32 bewirkt eine gute Abdichtung in axialer Richtung, und zwar eine Abdichtung des Lagers 13 in Bezug auf den Staubraum 15. Bei umlaufender Welle 10 wird die Dichtlippe 32 durch die Fliehkraft etwas entlastet, wodurch die Reibung an der Kontaktstelle zum Bodenteil 17 und damit der Verschleiß der Dichtlippe 32 reduziert wird.
Claims (8)
- Motorisch angetriebens Handaggregat, insbesondere Schleifgerät, z.B. Schwingschleifer, mit einem Gehäuse, in dem ein Motor zum Antrieb einer Welle (10) enthalten ist, die in einem Gehäuseteil (12) mittels eines Lagers (13) gelagert ist und in axialem Abstand vom Lager (13) ein Lüfterrad (14) trägt, dadurch gekennzeichnet, daß das Lager (13) auf der dem Lüfterrad (14) zugewandten Axialseite in Bezug auf das Lüfterrad (14) mittels eines mit der Welle (10) umlaufenden, axialen Dichtungselements (30) abgedichtet ist, wobei das axiale Dichtungselement (30) aus einer ringförmigen, flexiblen, insbesondere gummielastischen, Weilendichtung gebildet ist und einen Dichtungskörper (31) und zumindest eine flexible Dichtlippe (32) aufweist, die auf einer Axialseite vom Dichtungskörper (31) etwa umgekehrt kegelstumpfförmig abstrebt und relativ zu diesem elastisch bewegbar ist.
- Handaggregat nach Ansprüch 1, dadurch gekennzeichnet, daß das axiale Dichtungselement (30) auf der Welle (10) oder auf einer auf der Welle (10) sitzenden Hülse (18), z.B. einer Hülse (18) des Lüfterrades (14), mit Vorspannung aufgezogen und elastisch klemmend gehalten ist.
- Handaggregat nach Ansprüch 1 oder 2, dadurch gekennzeichnet, daß der Gehäuseteil (12) das Lüfterrad (14) umgibt und einen Staubraum (15) begrenzt und daß das Lager (13) außerhalb des Staubraumes (15) in einer etwa napfförmigen Aufnahme (16) des Gehäuseteils (12) und derart gehalten ist, daß der Bodenteil (17) der Aufnahme (16) das Lager (13) auf der dem Lüfterrad (14) zugewandten Seite im wesentlichen überdeckt.
- Handaggregat nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Lager (13) als Rillenkugellager ausgebildet ist und daß der Bodenteil (17) des Gehäuseteils (12) sich radial etwa bis zum Innenring (21) des Lagers (13) erstreckt.
- Handaggregat nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das axiale Dichtungselement (30) einen Durchlaß (19) des Bodenteils (17) gegenüber dem Staubraum (15) axial abdichtet.
- Handaggregat nach einem der Ansprüche 1 bis 5, dadurch gekennzeichet, daß das axiale Dichtungselement (30) mit seiner dem Bodenteil (17) zugewandten Axialseite am Bodenteil (17) elastisch anliegt.
- Handaggregat nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die mindestens eine flexible Dichtlippe (32) des axialen Dichtungselements (30), vorzugsweise mit geringer Vorspannung, am Bodenteil (17) anliegt.
- Handaggregat nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der Gehäuseteil (12) aus Leichtmetall, insbesondere aus Aluminium-Druckguß, besteht.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19708072 | 1997-02-28 | ||
DE19708072 | 1997-02-28 | ||
DE19800046 | 1998-01-02 | ||
DE19800046A DE19800046A1 (de) | 1997-02-28 | 1998-01-02 | Motorisch angetriebenes Handaggregat |
PCT/DE1998/000136 WO1998038014A1 (de) | 1997-02-28 | 1998-01-16 | Motorisch angetriebenes handaggregat |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0963278A1 EP0963278A1 (de) | 1999-12-15 |
EP0963278B1 true EP0963278B1 (de) | 2001-10-31 |
Family
ID=26034371
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98906813A Expired - Lifetime EP0963278B1 (de) | 1997-02-28 | 1998-01-16 | Motorisch angetriebenes handaggregat |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0963278B1 (de) |
JP (1) | JP2001513032A (de) |
CN (1) | CN1077833C (de) |
WO (1) | WO1998038014A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5012661B2 (ja) * | 2008-05-26 | 2012-08-29 | マックス株式会社 | 駆動工具 |
EP2422931A1 (de) * | 2010-08-31 | 2012-02-29 | Jöst GmbH | Universelle Schleiftellereinheit mit Absaughaube für eine Rotationsschleifmaschine |
JP5728303B2 (ja) * | 2011-06-15 | 2015-06-03 | 株式会社マキタ | 打撃工具 |
JP2017502526A (ja) | 2013-10-04 | 2017-01-19 | キング アブドゥラー ユニバーシティ オブ サイエンス アンド テクノロジー | 量子ドットを作製するためのシステム及び方法<関連出願からの優先権主張> 本願は、2013年10月4日に出願された、出願番号が61/886,837であり「量子ドットを作製するためのシステム及び方法」と題する同時係属中の米国仮出願からの優先権を主張するものであり、参照によりその全体が本明細書に組み込まれる。 本願は、2013年10月14日に出願された、出願番号が61/890,536であり「量子ドットを作製するためのシステム及び方法」と題する同時係属中の米国仮出願からの優先権を主張するものであり、参照によりその全体が本明細書に組み込まれる。 本願は、2014年7月15日に出願された、出願番号が62/024,490であり「量子ドットを作製するためのシステム及び方法」と題する同時係属中の米国仮出願からの優先権を主張するものであり、参照によりその全体が本明細書に組み込まれる。 |
DE102015121305A1 (de) * | 2015-12-08 | 2017-06-08 | Festool Gmbh | Hand-Werkzeugmaschine |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1951105A (en) * | 1933-02-03 | 1934-03-13 | American Floor Surfacing Mach | Rotary disk edging machine |
US2893174A (en) * | 1956-03-07 | 1959-07-07 | Sunbeam Corp | Surface treating machine |
ES364647A2 (es) * | 1968-04-08 | 1971-03-01 | Marti Cervera Manuel | Una maquina lijadora para paredes y similares. |
US4612734A (en) * | 1985-04-23 | 1986-09-23 | Shinko Electric Co., Ltd. | Grinding machine |
DE3916495A1 (de) * | 1989-05-20 | 1990-11-22 | Bosch Gmbh Robert | Handwerkzeug mit einem getriebegehaeuse mit dichtring |
US5833524A (en) * | 1994-08-22 | 1998-11-10 | Ryobi Limited | Dust collection system for a power tool |
-
1998
- 1998-01-16 CN CN98802866A patent/CN1077833C/zh not_active Expired - Lifetime
- 1998-01-16 WO PCT/DE1998/000136 patent/WO1998038014A1/de active IP Right Grant
- 1998-01-16 JP JP53714498A patent/JP2001513032A/ja active Pending
- 1998-01-16 EP EP98906813A patent/EP0963278B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CN1077833C (zh) | 2002-01-16 |
EP0963278A1 (de) | 1999-12-15 |
CN1248934A (zh) | 2000-03-29 |
WO1998038014A1 (de) | 1998-09-03 |
JP2001513032A (ja) | 2001-08-28 |
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