DE8910428U1 - Slip ring or commutator motor - Google Patents

Description

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Siemens AG 89 G 3 h 4 8 OE C Slip ring or commutator motor J The invention relates to a Schlelfr
tatorraotor gerne?« Preamble of claim 1;
Commutator motor is well known. ing
a or Koramu-
such

In the known commutator motors, the brushes are

Held in hammer or box brush holders and guided in a certain angular position to the ground surface of the slip ring, or commutator; for secure contact between the slip ring and the surface A separate brush pressure spring is used for the slip ring or commutator, which directly pulls or presses the brush against the commutator or slip ring.

A slip ring or commutator motor with a particularly

A brush holder that is easy to manufacture, easy to assemble and also functional over long service lives can be achieved by making the brush box and the brush pressure spring parts of a one-piece stamped and bent part.

In an advantageous manner, even taking into account the concentricity deviations of the commutator or slip ring that cannot always be avoided in small motors manufactured as mass-produced items, a motor with high running quality can be achieved if, after In one embodiment of the invention, the brush in the brush box can be pivoted about an axis which runs radially close to the surface and axially essentially in the axial direction of the commutator or the slip ring, whereby for the pivotable mounting of the brush during the stamping and bending of the brush box with the molded brush pressure spring rags and/or wall parts as

Dk 2 Th / 30.08.1989

···:. 89G3448OE

) 1 bearing mounts for the brush are punched out and bent out. According to one embodiment of the invention, shoulders are provided as corresponding bearing mounts on the brush, which are gripped by the tabs and extend over the brush in the direction of pressure, so that the bearing, which can be pivoted radially close to the surface, is retained even when the brush is pushed back in the direction of pressure due to wear on the brush.

The invention and further advantageous embodiments of the invention are explained in more detail below using schematically illustrated embodiments in the drawing, in which:

FIG 1 shows an axial front view of a brush holder with a brush box and integrally formed brush pressure spring,
FIG 2 the brush holder according to FIG 1 in radial

Top view,

FIG 3 the brush holder according to FIG 2 in section III-III,
FIG 4,5 in two different views the indirect

The pressure end of the brush pressure spring is placed on the brush via a pressure roller. 25

Figs. 1-3 show in three different views a brush holder according to the invention with a brush 8 that rubs against the surface of a commutator, 1, is enclosed by a brush box 2 by bending it on all sides with wall parts and is pressed against the surface of the commutator 1 by a brush pressure spring 27. The brush pressure spring 27 is an integral part of the brush box 2 and essentially consists of a bent part that runs horizontally in Fig. 1 to achieve a certain brush pressure constant, 35

a bending part running essentially vertically in FIG 1 to achieve a certain elasticity corresponding to the pivotable brush 8 and a pressure end which rests directly according to FIG 2 or according to FIG 4,5 indirectly via pressure rollers 10 on the radially upper surface of the brush &thgr;.

In order to achieve good running properties even with a non-circular commutator 1 and to adjust the position of the brush 8 in order to achieve the largest possible contact surface with the commutator 1, the brush 8 is pivotally mounted about an axis which runs radially close to the surface and axially essentially in the axial direction of the commutator 1; For this purpose, tabs 23, 24 engaging in corresponding radially extending steps 81, 82 of the brush 8 are bent out of the brush box 2 on the one hand for tangential contact with one side of the brush <* and on the other hand the wall part 26 of the brush box is bent for tangential contact with the other side of the brush 6} as can be seen in particular from FIG 3, the tabs 23, 24 or the wall part 26 of the brush box 2 intended as a contact for the brush 8 are designed to run radially outwards at an angle, so that a pivot axis for the brush 8 is formed between the radially inner lower edges of the tabs 23, 24 and the wall part 26 inclined towards the brush 8 and the upper end of the brush 8 can be inclined in the sense of the pivoting movement according to the invention.

In order to avoid a permanent brush inclination due to wear of the brush 8 in the direction of rotation of the commutator assumed in the direction of the arrow, the support point of the pressure end of the brush pressure spring 27 is offset off-center in the direction of rotation by a small amount.

Claims (5)

Protection claims 1. Slip ring or commutator motor with at least one brush (8) held in a brush box (2) on the stator side and pressed against the surface of a commutator (1) or a slip ring by a brush pressure spring (27), characterized in that the brush box (2) and the brush pressure spring (27) are parts of a one-piece stamped and bent part. 10 2. Slip ring or commutator motor according to claim 1, characterized in that the brush (8) in the brush box (2) is pivotable about an axis which runs radially close to the surface and axially essentially in the axial direction of the commutator (1) or the slip ring. 3. Slip ring or commutator motor according to claim 2, characterized by bearing points punched out and bent out or bent out of the brush box (2) in the sense of a pivotable bearing receptacle for the brush (8) (tabs 23, 24, wall part 26). 4. Slip ring or commutator motor according to claim 3, characterized by bearing receptacles provided in the brush (8) corresponding to the bent-out or bent-out bearing points (sections 81, 82). 5. Slip ring or commutator motor according to one of claims 1 to 4, characterized in that the brush pressure spring (27) rests with its pressure end indirectly on the brush (8) via at least one pressure roller (10; 10).