DE1944660A1 - Electric motor driven machine - Google Patents

Description

Electric motor driven machine

The invention relates to a machine driven by an electric motor, in particular an electric tool with an essentially longitudinally divided, consisting of two asymmetrical shells, in particular plastic shells, the drive motor, the electrical switching and control device and the housing enclosing the electrical connection, the inside has suitable supports and / or limits to axially hold and radially brace the components

There are known electric motor-driven household appliances and hand tools with a shell construction, the housing consists of two essentially symmetrical shells, in which the parting line with the motor shaft and the tool spindle axis lies in a common plane. The housing is usually used directly to support the motor shaft and / or the tool spindle is used, webs being provided in the shells, each half of which is for the motor shaft and / or contain bearing bores required for the tool spindle. When the machine is operated In the case of the bearing points on the gearbox side, this is due to the tooth pressure of the toothing of the pinion and gearwheel considerable bearing pressure, which pushes the two shells apart, and increased wear and tear on the divided ones causes storage points.

There are also handheld power tools with symmetrical plastic shells are known, in which for the transmission-side bearing a bearing block releasably fastened in one of the two shells is provided to provide one for these bearings To create a tight fit and the disadvantage described above Avoid using a power tool with two shells known, one of which is designed as a flange bearing plate with one shell half preferably through

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The whole drive motor is connected to the rear motor shaft bearing by a bracket this flange is attached. The transmission has a separate transmission housing arranged on the face of the surface on. Additional parts are required to mount the motor in these dual-shell power tools and their assembly is complex «In addition, the construction described last uses the full engine weight carried by the flange.

The invention is based on the task of an electric motor To create powered hand tools or household appliances with plastic shells, with as little as possible Molded parts as well as fastening elements are needed, their assembly in order to save assembly costs » is largely simple and in which the disadvantages of most two-shell machines in terms of bearing points on the transmission side be avoided.

This object is achieved according to the invention in that one for receiving motor and gear bearings and for fastening the gear or tool head and / or for Sealing of the gear compartment and / or undivided Hanscn serving to close off the engine compartment on the front side the one shell is injected, glued or otherwise non-releasably non-positively attached. the Supports and limits are designed in the shells so that the assembly and disassembly of the in the stand inserted anchor or runner together with the ventilation wing and the motor bearings with the second shell removed in the first shell by axial displacement or can be done by pivoting or tilting out and axial displacement. The maximum amount of the Limits in the first shell slightly less than

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the maximum determined by the play in the front engine mount radial displaceability of the corresponding support point from the anchor or from the Läuier or than from the play of the front Motor bearing and determined by the existing air gap between armature or rotor and Stänaer maximum radial Movability of the corresponding support point from the stand.

To make assembly easier, the air guide ribs are arranged asymmetrically in the shells »So that the splash is relieved of the weight of a heavy gear or tool head and in this Pail a frictional connection Connection also arises between the Plansch and the second shell, the splash in the area of the second Shell have through holes and can be the gear or tool head and / or the paddle itself by screws connected to the second shell during the Splash is formed in the area of the first shell shared with it for receiving Se? Ir ^ uoverbindungen. In order to better support the splash, the first shell has flat and / or rounded ones in the area of the plan view Stiffeners on. The second shell is provided with corresponding flats or roundings at these points. The puddle contains undivided storage locations if necessary with injected bearing bushes for the front motor bearing, the gear bearing and / or for the work spindle. In order to determine the position of the gear or tool head in relation to the Plansch, the Plansch has one for this Centering, dowel pins or another appropriate snug fit.

Two exemplary embodiments of the invention are shown in the drawings and are described in more detail below.

1 0 9 8 1 1 / Ί ü U

Show it

Fig. 1 shows an insulated hand drill with a commutator motor partly in longitudinal section and partly in view;

Fig. 2 shows the hand drill in front view without gear head ;

3 shows a cross section of the hand drill along the line II-II in FIG. 1;

Fig. 4 shows a longitudinal section along the line IH-III of figure ψ 1, wherein the gearhead omitted

has been;

5 shows the hand drill in plan view and partly in section;

Fig. 6 shows a fully insulated grinding motor without gear for direct drive partly in section and partly in Opinion.

The motor housing of the electrical tools shown in the figures consists of the plastic shells (1 and 2). It closes the stator belonging to the drive motor (3) » the motor armature (4) and the other electrical components a. The protective insulation is ensured by the insulating plastic Yentilationsflügel (5), which the output shaft (6) electrically separates from the armature shaft (?). However, the motor can also be one that is not fully insulated Be a collector or three-phase motor. In both examples, the flange (9 »10) with the shell (i) cast in one piece. The hand drill (Fig. 1-5) has a gear head (11) with a separate gear housing, which is attached to the flange (9). To the deadweight

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to increase the flange (9), the stiffeners are on both sides (12) molded on. The flange (9) has injection-molded metal bushings or bores (13-16) for receiving it the front engine mount (17) and the gearbox mount (18). This construction enables it to be used a modular system in which the same type of motor is used to drive different gearboxes or Tool heads can be used. The flange (9) must of course be designed in this case, that the number and position of the gearbox-side bearing bushes or · Bores (14-16) are matched to the various gear heads. Correct fit of the gear head (11) is ensured by the centering (19) located on the flat (9) or by other snug fit elements. At the Connection of heavier gear or tool heads as well as when clamping the tool in a device the load-bearing capacity of the flange (9, 10), which is only connected to the shell (1), may not be sufficient, therefore in this case the gear head (11) or the The flange (10) is screwed to the shell (2) and through-holes (20) are provided in the flange (9). The attachment the gear head (11) on the flange (9) or on the shell (2) and the flange (10) on the shell (2) Furthermore, the shell (2) on the shell (1) can be made with self-tapping screws and drill holes or with metal screws (21) and injected threaded bushings (22). The flange (10) of the one shown in FIG Embodiment is arranged in the same way as the flange (9), but this is not for receiving a gear head ee sonaern for bearing the tool spindle (23) educated.

The stator (3) and the rear motor bearing (24) and thereby the armature (4) are in the shells (1, 2) by supports (25) and boundaries (26-29) of the shell (1) or »boundaries (30,31)

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the shell (2) fixed * When assembling the pre-assembled Motor, i.e. the armature (4) inserted into the stator (3) with ventilation blades (5) and output shaft (6) as well as motor bearings (17, 24) in the shell (1) swiveled in and axially displaced until the front motor bearing (17) reaches its seat in the bearing point (13) and the support point (32) of the rear engine mount (24) over the boundary (28) or the. Support point (33) of the stand (3) gets over the limitation (29). The height of the limits (28, 29) must therefore be slightly smaller than the maximum radial displaceability determined by the play of the front engine mount (17) of the support point (32) or as determined by the play of the front engine mount (17) and the air gap (34) maximum radial displaceability of the support point (33). In order to be able to carry out the assembly the air guide ribs (35 »36) are arranged asymmetrically in the shells (1,2). After plaguing the shell (2) on the Shell (t) the engine parts are clamped by the supports (25) of the shell (2). With one that has become necessary Dismantling is done in reverse order to remove the complete motor.

The advantages achieved with the invention exist in particular in that the number of molded parts for the motor that can be used in the modular system is low, the assembly of the engine is extremely simple and there is a good seal between the gearbox and the engine.

Π3 ⁷ £ 811/1 OU

BAD ORfGiNAL

Claims (4)

Claims 1 · / Elektromotoriscli powered machine in particular Power tool with an essentially longitudinally divided, consisting of two asymmetrical shells, in particular plastic shells, the drive motor, the electric one Switching and control device and the electrical connection enclosing housing, the inside for axial retention and radial bracing of the components has suitable supports and / or limitations, thereby characterized in that on the front side of the for receiving the bearings (17, 18) and for attaching the Gear or tool head (11) and / or for sealing the gear compartment and / or to close off the engine compartment serving undivided splash (9) on the shell (1) injected, glued or otherwise non-releasably non-positively attached and the supports (25) or Limits (26-31) in the shells (1,2) so formed are that the assembly and disassembly of the armature (4) or rotor inserted into the stator (3) together with the ventilation blade (5) and the motor bearings (17,24) with the shell (2) removed in the shell (1) axial displacement or by pivoting or tilting out and axial displacement takes place, with the maximum Height of the boundaries (28, 29) in the shell (1) is slightly smaller than that of the game of the front Motor bearing (17) certain maximum radial displaceability of the support point (32) from the armature (4) or from Runner or as the maximum radial displaceability determined by the play of the front engine mount (17) and the air gap (34) the support point (33) from the stand (3). 1 0 9 8 1 1/1 0 U BATH ORIGINAL 2. Electric motor driven machine according to claim 1, characterized in that the air guide ribs (35 »36) are arranged asymmetrically in the shells (1, 2). 3. Electric motor driven machine according to claims 1 and 2, characterized in that the flange (9) in the Area of the shell (1) is designed to receive screw connections (22), in the area of the shell (2) Has through holes (20) and the gear or tool head (I1) and / or the flange (9) are connected to the shell (2) by screws (21), 4. Electric motor driven machine according to claims 1 to 3 »characterized in that the shell (1) in the Area of the flange (9, 1o) has flat and / or rounded stiffeners (12) and the shell (2) on these Places with corresponding flattening or rounding is provided. 5 «Electric motor driven machine according to the claims 1 to 4 »characterized in that the flange (9) has one or more injected bearing bushes? SE shared warehouse locations (13-16) for the front engine mount (17) mad / or for the gearbox bearing (18) « β. In that the flange (9) has electric motor driven machine according to. "In claims 1 to 5? _I characterized a centering (19) for the transmission of the © Weskssugkopf (11) ,, Electrically driven Ilaseliiae aaeli <t @ s / i • 1 to 4, dadurek gek @ nmg © iclmetg class der Plansch (10) a © or several undivided © Üagerstellea © the injected Bearing bushes (13) for the voräere engine position? Ci?) And / or for the tfes & eeugepiodel (25) has « 1/1014
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