EP2252431A1 - Machine-outil a main, en particulier meuleuse a main - Google Patents

Machine-outil a main, en particulier meuleuse a main

Info

Publication number
EP2252431A1
EP2252431A1 EP08873486A EP08873486A EP2252431A1 EP 2252431 A1 EP2252431 A1 EP 2252431A1 EP 08873486 A EP08873486 A EP 08873486A EP 08873486 A EP08873486 A EP 08873486A EP 2252431 A1 EP2252431 A1 EP 2252431A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
hand tool
housing
tool according
counter
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.)
Granted
Application number
EP08873486A
Other languages
German (de)
English (en)
Other versions
EP2252431B1 (fr
Inventor
Balazs Bogardi
Roland Kaplar
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 EP2252431A1 publication Critical patent/EP2252431A1/fr
Application granted granted Critical
Publication of EP2252431B1 publication Critical patent/EP2252431B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • 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
    • B25F5/02—Construction of casings, bodies or handles

Definitions

  • Hand tool in particular hand-guided grinding machine
  • the invention relates to a hand tool, in particular a hand-held grinding machine according to the preamble of claim 1.
  • an angle grinder which has in a housing a drive motor for the rotatable drive of a tool shaft to which a grinding tool is attached.
  • Such angle grinder are usually driven by an electric motor, wherein the drive shaft of the electric drive motor is arranged perpendicular to the tool shaft and is coupled thereto via a transmission.
  • Vibrations of the drive motor and on the other come from the contact between the grinding tool and the workpiece to be machined. Therefore, in addition to a simple installation and to pay attention to a high stability.
  • lubricants which are used in particular for supporting the drive shaft and the tool shaft, heat up during operation and liquefy thereby causing the risk of an undesired escape of the lubricant.
  • the invention is based on the object on the one hand to simplify the assembly of a hand tool and on the other hand, in particular to form the housing of the power tool stable.
  • the hand tool according to the invention which is in particular a hand-held grinding machine such as an angle grinder, is provided with an at least two-part housing, wherein the two housing parts of the power tool via a
  • Connecting means are to be interconnected.
  • the connecting device has a plug-in connection, which comprises a connection piece on the first housing part and a counterpart connection piece on the second housing part, wherein connection piece and counterpart connection engage one another positively in the mounted position.
  • At least a portion of the nozzle is provided with a draft, which forms an angle relative to the nozzle longitudinal axis, wherein the counter-nozzle is adapted to the draft.
  • This embodiment has the advantage that the connection between the housing parts due to the draft, which occupies an angle relative to the mounting direction, can be produced in a simple manner.
  • the merging of the housing parts during assembly takes place in the direction of the nozzle longitudinal axis, wherein the draft angle ensures an automatic centering of the housing parts.
  • the assembly is thereby considerably simplified.
  • tapeered assumes, wherein the cone extend either over the entire axial length of the nozzle or, according to another embodiment, only over an axial portion, wherein the non-conical portion is formed, for example, cylindrical.
  • an axially projecting draft is integrally formed on the neck, which forms an angle with the nozzle longitudinal axis.
  • the draft which is formed integrally with the neck, the angled portion which is inclined relative to the nozzle longitudinal axis, which also represents the mounting direction at an angle.
  • the nozzle provided with the axially projecting draft can either be cylindrical in itself or cone-shaped, the cone angle advantageously coinciding with the angle of the draft, but possibly also deviating therefrom, in particular having a smaller cone angle than the draft.
  • a plurality of draft angles are formed on the nozzle and corresponding guide recesses on the guide stub, wherein the drafted form rising axially over the neck. This results in the mounted position in the circumferential direction a positive interlocking between the nozzle and counter-nozzle.
  • the nozzle and the counter-nozzle are suitably designed for receiving the drive shaft of a drive motor of the power tool.
  • the drive shaft is passed through the nozzle or the counterpart and through a transmission with the - A -
  • Coupled tool shaft The nozzle or the counter-nozzle also causes storage and stabilization of the drive shaft, including in particular a pivot bearing is inserted into the nozzle.
  • a pivot bearing is inserted into the nozzle.
  • an additional sealing ring which is positioned between the circumference of the pivot bearing and the inner wall of the nozzle and prevents a transfer of liquefied lubricant, in particular lubricating oil.
  • the sealing ring expediently has a minimum hardness of 40 ShoreA in order to ensure sufficient tightness on the loads occurring during operation.
  • the two housing parts to be connected are, in particular, a motor housing in which the drive motor is accommodated, as well as a gear housing in which the tool shaft is mounted for driving the tool.
  • the motor housing is advantageously made of plastic, whereas the gear housing may be made of light metal, for example aluminum.
  • the motor housing is made in several parts, for example, by two half-shells are provided, which are interconnected and supplemented to the motor housing, which is connected to the transmission housing via the connector.
  • Fig. 1 is a sectional view of a trained as angle grinder hand tool with a
  • Motor housing for receiving the drive motor and a gear housing for receiving the tool shaft
  • Fig. 2 is a perspective view of the transmission housing and to be connected to the transmission housing
  • Section of the motor housing, shown in an approximate position during assembly, 3 is a representation corresponding to FIG. 2, but in the mounted position of engine and transmission housing,
  • Fig. 4 is a detail view of a section of the
  • FIG. 6 is a sectional view taken along section line VI-VI of Fig. 5,
  • FIG. 7 is a sectional view taken along section line VII-VII of FIG. 5,
  • Fig. 8 is a perspective view of the to be mounted
  • Fig. 9 shows the assembled position of the engine and transmission housing in a sectional view.
  • the hand tool 1 shown in Fig. 1 is as
  • Angle grinder formed, which has a two-part housing with a motor housing 2 and a transmission housing 3.
  • a motor housing 2 In the motor housing 2, an electric drive motor 4 is received, in the gear housing 3, a tool shaft 7 is rotatably mounted, on which the grinding tool 8 is fixed.
  • a protective cover 10 is additionally attached, which engages over the tool 8.
  • the drive or armature shaft 5 of the electric drive motor 4 extends at right angles to the tool shaft 7 and is rotationally coupled to the tool shaft 7 via a gear 6 located in the gear housing 3.
  • the motor housing 2 and the gear housing 3 are connected to one another via a connecting device 11 designed as a plug connection, which is described in more detail in the following figures.
  • Connector executed connecting device 11 a nozzle 12 which is integrally formed on the transmission housing 3, and an associated counter-pipe 13, which is integrally formed with the motor housing 2.
  • connection piece 12 and counterpart connection 13 are inserted into one another, the assembly direction simultaneously represents the axial direction of connection piece 12 or counterpart connection piece 13.
  • This axial direction coincides with the axial direction of the drive or armature shaft of the motor through the opening in the nozzle 12 and the connecting piece 13 is guided.
  • Stub 12 and counter-stub 13 are substantially cylindrical or hollow cylindrical, but they have at least partially a small cone angle, in such a way that taper the tapered portions on the nozzle 12 and counter-stub 13 in the direction of the transmission housing 3. This centering and easier assembly of these two housing components is achieved in the assembly of the motor housing 2 and the gear housing 3.
  • axially projecting draft slopes 14 are provided, each extending over an angular segment in the circumferential direction of the nozzle 12.
  • a total of four such draft 14 is on the side of the nozzle 13 on the motor housing 2 each one
  • both the nozzle 12 including the draft 14 and the counter-nozzle 13 with the guide recesses 15 are completely formed, ie over their respective axial length, with a cone angle.
  • a rotary bearing 16 in which the drive shaft is rotatably mounted, is inserted into the recess in the counterpart connection 13 on the motor housing 2.
  • the counter-pipe 13 is formed on a cross-strut 17, which is integrally formed with the motor housing 2 and extending from a side wall of the motor housing 2, starting in the transverse direction.
  • the inner wall of the connecting piece 12 and the outer wall of the counterpart nozzle 13 are conical with a cone angle ⁇ , which is expediently less than 20 ° and in the exemplary embodiment is approximately 10 °.
  • the inner wall of the die neck 12 is formed over the entire axial length including the draft 14 (Fig. 6) cone-shaped, the outer wall of the nozzle 13, however, only over the axial length of the guide grooves 15.
  • the inner wall of the nozzle 13, in which the pivot bearing 16 is inserted is cylindrical.
  • the rotary bearing 16 is encompassed by a sealing ring 18, which is inserted into the connecting device, consisting of connecting pieces 12 and counter-nozzles 13.
  • the sealing ring 18 is located on the peripheral side of the pivot bearing 16, wherein the nozzle 12 and counter-nozzles 13 are formed in the manner can, that a small circumferential receiving groove for the sealing ring 18 is formed.
  • the sealing ring 18, which has a ShoreA hardness of at least 40, located in the mounted position exactly on the abutting edge between the nozzle 12 and counter-nozzle 13th

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

Machine-outil à main qui comporte un boîtier en deux parties destinées à être reliées l'une à l'autre par un système de liaison qui est conçu sous forme de liaison par emboîtement. Ladite liaison par emboîtement comporte un élément mâle situé sur la première partie de boîtier et un élément femelle situé sur la seconde partie de boîtier. Au moins une partie de l'élément mâle et de l'élément femelle forment un angle avec l'axe longitudinal de l'élément mâle.
EP08873486A 2008-03-18 2008-11-18 Machine-outil a main, en particulier meuleuse a main Not-in-force EP2252431B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008000737A DE102008000737A1 (de) 2008-03-18 2008-03-18 Handwerkzeugmaschine, insbesondere handgeführte Schleifmaschine
PCT/EP2008/065710 WO2009115143A1 (fr) 2008-03-18 2008-11-18 Machine-outil à main, en particulier meuleuse à main

Publications (2)

Publication Number Publication Date
EP2252431A1 true EP2252431A1 (fr) 2010-11-24
EP2252431B1 EP2252431B1 (fr) 2012-10-17

Family

ID=40329219

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08873486A Not-in-force EP2252431B1 (fr) 2008-03-18 2008-11-18 Machine-outil a main, en particulier meuleuse a main

Country Status (5)

Country Link
US (1) US20110021120A1 (fr)
EP (1) EP2252431B1 (fr)
CN (1) CN101977730A (fr)
DE (1) DE102008000737A1 (fr)
WO (1) WO2009115143A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5853761B2 (ja) * 2012-02-24 2016-02-09 日産自動車株式会社 駆動力伝達装置
DE102012103935B4 (de) * 2012-05-04 2015-03-19 C. & E. Fein Gmbh Gehäuse mit Schalterabdeckung
EP2821184B1 (fr) 2013-07-05 2018-12-26 Black & Decker Inc. Marteau perforateur
DE102014210915A1 (de) * 2014-06-06 2015-12-17 Robert Bosch Gmbh Elektrowerkzeugmaschine
US11396078B2 (en) * 2019-06-10 2022-07-26 Makita Corporation Grinder

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4266376A (en) * 1979-02-09 1981-05-12 Black & Decker Inc. Portable electrically energized surface finishing tool
DE4102482A1 (de) * 1991-01-29 1992-07-30 Bosch Gmbh Robert Handwerkzeugmaschine
DE4113641A1 (de) * 1991-04-26 1992-10-29 Bosch Gmbh Robert Handwerkzeugmaschine
DE4113820A1 (de) 1991-04-27 1992-10-29 Boehringer Mannheim Gmbh Verwendung von torasemid zur behandlung von hirnoedemen
US5642008A (en) * 1995-10-20 1997-06-24 Waxing Corporation Of America, Inc. Power tool motor assembly
DE10000700A1 (de) 2000-01-10 2001-07-12 Bosch Gmbh Robert Winkelschleifer
DE102004016171A1 (de) * 2004-03-30 2005-10-20 Bosch Gmbh Robert Handwerkzeugmaschine
DE102005061870A1 (de) * 2005-12-23 2007-07-05 Robert Bosch Gmbh Handwerkzeugmaschine
JP4962896B2 (ja) * 2006-03-10 2012-06-27 日立工機株式会社 動力工具

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009115143A1 *

Also Published As

Publication number Publication date
US20110021120A1 (en) 2011-01-27
CN101977730A (zh) 2011-02-16
WO2009115143A1 (fr) 2009-09-24
EP2252431B1 (fr) 2012-10-17
DE102008000737A1 (de) 2009-09-24

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