DE971979C - Electrical machine, in particular small electric motor, with at least one sliding contact and with an insulating material plate which is fastened perpendicular to the armature axis in the machine housing and serves as a sliding contact carrier - Google Patents

Description

ISSUED MAY 6, 1959

B 22287VIIIb / 2idi

The invention relates to an electrical machine, in particular a small electric motor at least one sliding contact with one attached perpendicular to the armature axis in the machine housing and an insulating plate serving as a sliding contact carrier is provided with an opening which the circumferential part of the machine carrying the grinding surface protrudes. Such a one Arrangement offers the advantage that the sliding contact carrier is easy and without cumbersome holding means can be attached in the housing of the electrical machine. In the known embodiments However, this type still has the disadvantage that for receiving and holding the sliding contacts or brushes, which because of the im Continuous operation progressive wear caused by springs against the sliding contact surface, for example a commutator must be flexibly supported, suitable sliding contact carriers must be provided are. Box-shaped guide members are used for this in the known embodiments or swivel arms in which the sliding contacts are mounted in a longitudinally displaceable manner or fastened so that they can be swiveled are and which require a complex and relatively expensive production.

A much simpler and particularly easy to assemble design is according to the invention created by the fact that the insulating material

909 504/11

Plate with radially directed, opening into the passage opening for the rotating machine part Slits are provided, on the flanks of which in their longitudinal direction on both sides with Sliding contact pieces provided with matching grooves are guided in a longitudinally displaceable manner. In itself it is known to provide the sliding contact pieces on electrical machines with grooves that engage in guide ribs of the associated contact carriers. However, grooved sliding contact pieces can be used in conjunction with an insulating plate of the type characterized above a structurally particularly simple and advantageous brush guide.

Further features of the invention characterized in the claims and the particular advantages of the subject invention are the following description refer to, which relate to the two embodiments shown in the drawing games relates. It shows

FIG. 1 in longitudinal section along line I-I in FIG. 2 the first embodiment,

Fig. 2 shows a cross section along line H-II in

Fig · ι.
Fig. 3 shows a detail;

Fig. 4 shows a longitudinal section through the second embodiment,

Fig. 5 shows a detail of this embodiment and

FIG. 6 shows a section along line VI-VI in FIG. 5.

The first. Embodiment according to FIG. 1

and 2 are on the stator 10 of a small electric motor two cap-shaped housing parts 11 and 12 with Fixed by screws 13. A bearing 14 is located in each of the two housing caps for a shaft 15 on which an armature 16 and a commutator 17 are attached. About each Screw 13, a tubular spacer 18 is pushed, one end face of which on the stand 10 is supported. A helical spring 19 is used against the other end of this pipe section an insulating plate 20 pressed on. This plate has j an opening 21, whose. Edge the commutator 17 surrounds at a distance and in the two radial guide slots 22 for matching with. Grooves 23 (Fig. 3) provided sliding contact pieces or brushes 24 open. These contact pieces are under Action of screw springs25, which in each an enlarged part 26 of the radial slots are accommodated. Each of these springs is supported on the one hand at the end of the relevant slot and on the other hand at the outer end of the associated Contact piece 24 from. A peg-like extension 27 on the insulating plate at the end of each slot 22 protrudes into the end turns of the associated spring 25.

In the second embodiment according to FIGS. 4 to 6, the carrier of the contact pieces 24 is a Pressed part, the bottom of which forms the insulating plate 20. The slots 22 are here completely carried out. The cylindrical edge 28 holds the two Bottom halves together and is provided with supports 29. One of these supports has an end attachment 32 (Fig. 6), which protrudes into a corresponding recess 31 of the electric motor stand 30. Each dei both bottom halves, has a sleeve-shaped elevation 33 in which a helical spring 19 is supported, and around which the turns 35 of a torsion spring are placed. One end 36 each Torsion spring is on. supported by a retaining tab 37 protruding through the insulating plate, while the other end 34 of this spring on the outer end face of the sliding contact piece 24 forming brush. The retaining tabs 37 are designed as cable lugs on which power supplies 38 are connected.

In this embodiment, too, the current collector does not need any holding means when assembling the motor, and special operations would have to be carried out to attach them. The current collector only needs to be inserted in such a way that the end faces of the supports 29 rest on the stand 30 and the end extension 32 engages in the recess 31. In this position, the current collector is held in place by the springs 19, which rest against the surface 39 after the housing cap 11 has been fastened. In the embodiment according to FIGS are attached, which are _{screwed onto the g 0} shaft of the screw 13 against the insulating plate.

Claims (9)

PATENT CLAIMS: 1.Electric machine, in particular a clay electric motor, with at least one sliding contact, with one fixed perpendicular to the armature axis in the machine housing and serving as a sliding contact carrier Serving insulating material plate is provided with an opening through which the circumferential part of the grinding surface carrying the Machine protrudes through, characterized in that the insulating plate (20) with radially directed, opening into the passage opening (21) for the rotating machine part (17) Slots (22) is provided, on the flanks of which in their longitudinal direction on both sides with matching Sliding contact pieces (24) provided with grooves (23) are guided so as to be longitudinally displaceable. 2. Electrical machine according to claim 1, wherein each sliding contact piece under the action a helical spring, characterized in that the insulating plate (20) on End of each slot (22) has a protruding into the slot extension (27) which in the End turns of the associated spring (25) engages and serves as a fixed spring abutment (Fig. 2). iao 3. Electrical machine according to claim 1, characterized in that the insulating plate (20) is provided with axially directed supports (29) which are attached to a fixed component of the machine, in particular on their stand (30), are supported (Fig. 4 and 6). 4 · Electrical machine according to claim 3, characterized in that one of the supports {29) has a front extension (32) projecting into a recess (31) in the stand (30) (Figures 4 and 6). 5. Electrical machine according to claim 1, 3 and 4, characterized in that the insulating plate (20) is a pressed part which has a bottom and a stiffening edge (28), and that the radial slots (22) and the opening (21) are provided in the bottom (FIGS. 4 to 6). 6. Electrical machine according to claim 1 to 5, characterized in that for fastening the insulating plate (20) coil springs (19) serve on the one hand on the bearing cover (11) on the machine and on the other hand on the plate (20) are supported (Fig. 1 and 6). 7. Electrical machine according to claim 6 “thereby characterized in that the ends of the coil springs facing the insulating material plate (20) (19) of sleeve-shaped elevations (33) of the insulating plate (20) are bordered (Fig. 6). . 8. Electrical machine according to claim 7, wherein the one end of each sliding contact piece a torsion spring acts, the central part of which is helically wound and the other End is supported on a fixed abutment, characterized in that the turns (3.5) of the torsion springs surround the sleeve-shaped elevations (33) of the insulating plate (20) (Figures 4 to 6). 9. Electrical machine according to claim 8, characterized in that a through the insulating plate (20) protruding retaining tab (37) serves as an abutment of the torsion spring end (36) to be firmly supported. Considered publications:
German Patent Nos. 250089, 603 159; USA. Patents No. 863 683, 1 546 373, ι 923 864, 2 584 214. 1 sheet of drawings © 609547/226 6.56 (909 504/11 4.59)