WO1993005561A1 - Outil portatif a moteur electrique - Google Patents

Outil portatif a moteur electrique Download PDF

Info

Publication number
WO1993005561A1
WO1993005561A1 PCT/DE1992/000713 DE9200713W WO9305561A1 WO 1993005561 A1 WO1993005561 A1 WO 1993005561A1 DE 9200713 W DE9200713 W DE 9200713W WO 9305561 A1 WO9305561 A1 WO 9305561A1
Authority
WO
WIPO (PCT)
Prior art keywords
bearing
power tool
tool according
bridge
rotor
Prior art date
Application number
PCT/DE1992/000713
Other languages
German (de)
English (en)
Inventor
Alfred Odendahl
Ernst Kränzler
Thomas Fuchs
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 WO1993005561A1 publication Critical patent/WO1993005561A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/66—Structural association with auxiliary electric devices influencing the characteristic of, or controlling, the machine, e.g. with impedances or switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
    • H02K11/026—Suppressors associated with brushes, brush holders or their supports
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/14—Means for supporting or protecting brushes or brush holders
    • H02K5/143—Means for supporting or protecting brushes or brush holders for cooperation with commutators
    • H02K5/148—Slidably supported brushes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
    • H02K5/1672—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings radially supporting the rotary shaft at both ends of the rotor

Definitions

  • the invention is based on a hand-held machine tool according to the preamble of claim 1.
  • the electric motor is at least partially pre-assembled and inserted transversely to the axis.
  • the electric motor is preassembled in the axial direction and inserted into the preferably pot-shaped housing which can be screwed onto the cover.
  • a generic hand-held power tool is known from US 4,638,196. Its multi-part housing, formed from half-shells, contains a bearing block, preferably made of insulating plastic, and accommodates a bearing bridge, which forms a preassembled assembly with brush holders and brushes, which are fastened with fastenings on the pedestal in the half-shell can be converted into its operative position. On one side, the brushes are electrically connected to a power supply cable via plug contacts of the bearing bridge and via a switch, and on the other side they can be coupled to the stator via further electrical plug contacts, with a separate, electrical reversing switch, ie for right Counterclockwise rotation, via separate cables or plug contacts with the bearing bridge can be connected trically.
  • a separate, electrical reversing switch ie for right Counterclockwise rotation
  • an insulation shield must be arranged on the rotor shaft between the collector and the bearing in order to create a barrier against leakage currents from the collector to the bearing.
  • a perforated disc made of insulating plastic is slid onto the rotor shaft before assembly of the bearing and the bearing is then pressed on.
  • the housing or the bearing bridge is designed such that a fixed insulation shield is arranged near the bearing seat in such a way that it encompasses the rotor shaft between the bearing and the collector in a U-shape.
  • the known hand-held power tool has the disadvantage that, in the final assembly of the bearing bridge, a separate reversing switch and the rotor in the half-shell, the outlay in terms of cabling and assembly is high.
  • the configuration of the bearing bracket with a fixed insulation shield which reduces the assembly effort slightly compared to the known prior art, allows only a certain type of assembly of the known handheld power tool, it being impossible, for example, to first assemble the bearing bracket with the stator and then the one with the Guide the pre-assembled bearing through the stator and anchor it in the bearing bracket.
  • the insulation shield which is advantageous per se, forms an impassable obstacle to assembly: the possible angle of inclination of the rotor in the stator during assembly is too small to allow passage of the collector-side rotor shaft end together with the bearing via the insulation shield.
  • the hand tool according to the invention with the characteristic Features of claim 1 have the advantage over the prior art that a bearing bridge with an integrated reversing switch can be fixed outside the housing on the stator, and that the rotor can be pre-assembled in the bearing bridge through the stator.
  • a particular advantage is that the assembly position mentioned can be fixed particularly precisely and securely in the housing by means of the laterally insertable insulation shield.
  • FIG. 1 an exploded view of the drive area of a hand tool according to the invention
  • FIG. 2 shows a side view of the preassembled motor parts in mounting position over a housing half-shell
  • FIG. 3 shows an embodiment of the bearing bracket of the hand tool according to the invention.
  • the hand-held power tool 1 partially shown in FIG. 1 shows a rotor 3, on the rotor shaft 5 of which a collector 7 and at a distance adjacent to it sits a firmly mounted bearing 9 designed as a ball bearing.
  • a schematically illustrated stator 11 which carries socket elements 13, 15, 17, 19 on its side facing away from the rotor 3.
  • a bearing bracket 21 is shown at an axial distance from these.
  • the bearing bridge 21 On its side facing the stator 11, the bearing bridge 21 carries plug elements 23, 25, 27, 29, which fit into the socket elements 13, 15, 17, 19 of the stator 11.
  • the bearing bridge 21 On opposite sides transverse to the longitudinal axis of the rotor 3, the bearing bridge 21 carries brush holders 31, 33 for receiving carbon brushes, not shown.
  • a hollow socket 35 sits essentially parallel to the brush holders 31, 33 on the underside of the bearing bridge 21. Inside the hollow socket 35, conductor rails (not shown) in the form of extensions of the plug elements 23, 25, 27, 29 are exposed in some areas , without electrical isolation. This is supported by a switching disk 37 with switching contacts (not shown) and a switching cover 39 which are in engagement with a switching lever 41 which can be pivoted about an axis 57. With this, a change in the direction of rotation of the rotor 3 is achieved in each end position.
  • the switching disk 37, the cover 39 and the switch lever 41 are detachably seated in the hollow connector 35.
  • the bearing bridge 21 has a slot 43 which extends transversely to the axis of the rotor 3 and in which an insulation shield 45 can be displaced in a guided manner.
  • a downwardly open, semicircular bearing shell 47 is formed in the bearing bridge 21, which forms half of the seat for the outer ring of the bearing 9 of the rotor 3.
  • the other side of the seat is formed by an upwardly open, semicircular bearing shell 48 of a bearing block 51 seated in a lower half shell 49 of the housing, into which the rotor 3, the stator 11 and the bearing bracket 21 can be inserted completely pre-assembled.
  • the slot 43 in the bearing bridge 21 and the insulation plate 45 are dimensioned such that in the assembled position of the rotor 3 to the bearing bridge 21 the space between the collector 7 and the ball bearing 9 is encompassed by the insulation plate 45 and thus the axial position of the rotor 3 is secured.
  • an on and off switch 53 can be used, on which a cover plate 55 is supported with an axis 57, which form a pivot bearing for the switch lever 41.
  • the electric motor 2 is mounted in the following way:
  • the bearing bridge 21 is coupled to the socket elements 23, 25, 27, 29 of the stator 11 via the plug elements 13, 15, 17, 19. With this, their mutual position is fixed.
  • the rotor 3 preassembled with the bearing 9 is pushed through the stator 11 into its operative position, so that the bearing 9 is seated in the bearing seat of the bearing bracket 21, namely in the bearing shell 47.
  • This pre-assembly position is fixed by inserting the end shield 45 into the slot 43 between the collector 7 and the bearing 9.
  • the pre-assembled parts are then inserted into the half-shell 49, so that the lower region of the outer ring of the bearing 9 is seated in the bearing shell 48. Then, through unspecified through holes in the bearing bridge 21, the latter is connected to the bearing block 51, for example screwed.
  • the displaceable insulation shield 45 overlaps the fixed counter-insulation shield 46 and adheres to it with a non-specified latching connection in a force-locking or positive manner.
  • FIG. 2 shows a side view of the embodiment shown in FIG. 1 with slightly changed proportions as a pre-assembled unit consisting of stator 11, rotor 3 and bearing bracket 21, the coupling of the insulation shield 45 to the counter-insulation shield 46 being clearly visible .
  • the lower half shell 49 of the housing is shown in its assignment to the preassembled unit.
  • the bearing block 51 is in one piece with the fixed counter-insulation shield 46 for axial securing of the rotor 3 connected.
  • the counter insulation shield 46 can be partially overlapped by the displaceable insulation shield 45. In the end position, the two insulation slides 45, 46 hold on to one another in a non-positive or positive manner, in particular latching.
  • the busbars 63, 69 carry coil-like elements 75 to suppress or to minimize sparking between the carbon brushes (not shown) and the collector 7.
  • the busbars carry further electrical or electronic components suitable for power control or for interference suppression.
  • a one-piece bearing bridge which contains the complete seat for the collector-side bearing.
  • slots are machined into the bearing bridge, in particular on angularly opposite sides, in each of which an insulation shield is slidably guided.
  • the insulation shields can grip around the rotor shaft in the installed position between the collector and the bearing and, moreover, can hold onto one another in a captive manner. The rotor is thus axially secured to the bearing bridge or the stator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

Un outil électrique, notamment un outil portatif (1), comporte un carter constitué notamment de deux demi-coques (49), et un moteur électrique (2) se présentant sous la forme d'un moteur à collecteur réversible, et pourvu d'un arbre (5) portant un rotor (3). Un coussinet (9) situé à l'extrémité côté collecteur de l'arbre (5) est disposé d'une part dans la demi-coque (49) et est entouré d'autre part d'une console terminale (31) qui peut être connectée électriquement à une alimentation et à un stator (11) et peut recevoir le porte-balais (31) pour des balais en charbon. Ledit outil électrique est conçu pour un montage plus facile et plus précis afin que les composants électriques enfichables (23, 25, 27, 29) de la console terminale (21) puissent être enfichés directement dans les composants femelles (13, 15, 17, 19) du stator (11) et que leur positionnement respectif soit déterminé par le fait qu'une plaque d'isolation (45) passant par au moins une fente (43) ménagée dans la console terminale (21), et guidée dans celle-ci de manière coulissante, peut venir se positionner sur l'arbre (5) entre le collecteur (7) et le coussinet (9) et ainsi fixer le rotor (3) et la console terminale (21) axialement l'un par rapport à l'autre, notamment dans une position de prémontage pour le positionnement dans la demi-coque (49).
PCT/DE1992/000713 1991-09-06 1992-08-27 Outil portatif a moteur electrique WO1993005561A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4129720A DE4129720A1 (de) 1991-09-06 1991-09-06 Handwerkzeugmaschine mit einem elektromotor
DEP4129720.2 1991-09-06

Publications (1)

Publication Number Publication Date
WO1993005561A1 true WO1993005561A1 (fr) 1993-03-18

Family

ID=6440057

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1992/000713 WO1993005561A1 (fr) 1991-09-06 1992-08-27 Outil portatif a moteur electrique

Country Status (2)

Country Link
DE (1) DE4129720A1 (fr)
WO (1) WO1993005561A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2342231A (en) * 1998-08-14 2000-04-05 Sb Power Tool Co Brush system with direct stator connectionfor an electric motor

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3872897B2 (ja) * 1998-06-17 2007-01-24 株式会社マキタ 電動工具
JP3672774B2 (ja) 1999-10-12 2005-07-20 株式会社マキタ 携帯用電動工具における電装品の装着構造
JP3676956B2 (ja) * 1999-11-19 2005-07-27 株式会社マキタ 電動工具及びその組み付け方法
DE10058591A1 (de) * 2000-11-25 2002-05-29 Bosch Gmbh Robert Vorrichtung mit Lager
DE20307198U1 (de) * 2003-05-08 2003-09-25 Minebea Co Ltd Rotor für einen Elektromotor
US7503838B2 (en) 2005-03-24 2009-03-17 Black & Decker Inc. Belt sander

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3311557A1 (de) * 1983-03-30 1984-10-04 Black & Decker, Inc. (Eine Gesellschaft N.D.Ges.D. Staates Delaware), Newark, Del. Verfahren zur montage eines elektromotors sowie elektromotor
EP0158065A2 (fr) * 1984-04-07 1985-10-16 Robert Bosch Gmbh Outillage à main avec un moteur électrique
EP0235735A1 (fr) * 1986-03-04 1987-09-09 Kress-elektrik GmbH + Co. Elektromotorenfabrik Outil électrique portatif
EP0235443A1 (fr) * 1985-10-31 1987-09-09 Black & Decker Inc. Moteurs électriques et composants pour ceux-ci

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3311557A1 (de) * 1983-03-30 1984-10-04 Black & Decker, Inc. (Eine Gesellschaft N.D.Ges.D. Staates Delaware), Newark, Del. Verfahren zur montage eines elektromotors sowie elektromotor
EP0158065A2 (fr) * 1984-04-07 1985-10-16 Robert Bosch Gmbh Outillage à main avec un moteur électrique
EP0235443A1 (fr) * 1985-10-31 1987-09-09 Black & Decker Inc. Moteurs électriques et composants pour ceux-ci
EP0235735A1 (fr) * 1986-03-04 1987-09-09 Kress-elektrik GmbH + Co. Elektromotorenfabrik Outil électrique portatif

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2342231A (en) * 1998-08-14 2000-04-05 Sb Power Tool Co Brush system with direct stator connectionfor an electric motor
US6133665A (en) * 1998-08-14 2000-10-17 S-B Power Tool Company Brush system for electric motors
GB2342231B (en) * 1998-08-14 2003-04-02 Sb Power Tool Co Brush system for electric motors

Also Published As

Publication number Publication date
DE4129720A1 (de) 1993-03-11

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