DE8905006U1 - Brush holders, in particular hammer brush holders, for a commutator motor - Google Patents

Description

^Brush holders, in particular hammer brush holders» for a commutator motor -^ ₇

The invention relates to a brush holder, in particular a hammer brush holder, for a commutator motor according to the preamble of claim Ij. Such a brush holder is known from EP-Bi-0 175 093.

In the above-mentioned known case, in order to achieve an assembly position with the brushes of a Hamrser brush holder held at a distance from the Koramut a tor surface, it is provided that the two Brush support arms of the hammer brush holder are parts of a one-piece plastic injection molded part with a cast-in bridge that holds the two brush support arms at a mutual distance from the commutator surface without contact and can be broken off after assembly.

Through the German patent application B31092 VIIIb/21d ⁱ a device for the assembly of the brush holder carrying part of electrical machines is known, in which the brushes of a box brush holder are in an assembly position with the commutator surface at a contact-free radial distance by pins that are axially inserted under the brush grinding surface through a bearing shield opening, which are arranged in such a way that they are gripped by the front face of the commutator during motor assembly and pushed outwards so far that the Brushes come into contact with the commutator surface and the pins can be pulled outwards.

The invention is based on the object of providing a brush holder with brushes held movably against the commutator on a brush holder in comparison to the known

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Solutions that are more reliable in operation and easier to install, particularly advantageous for use in automatic production Design that allows the brushes to be temporarily kept at a distance from the commutator surface in the assembly position, that the rotor with its commutator can be mounted without hindrance.

This object is achieved in a brush holder of the type mentioned at the outset by the teaching of claim 1; advantageous embodiments of the invention are the subject of the subclaims.

The inventive design of a brush holder allows for the removal of

Spacer brackets and/or their safe storage

inside or outside the motor a mounting bracket for each individual brush holder with subsequent release into its operating position both in the case of initial production and in the case of later repairs with little effort when dismantling the assembly position} during initial assembly, a separate handling step can be omitted, particularly in the case of advantageous automatic production, to release the brushes into their operating position, especially if during motor assembly the stop is provided by a axially against the brush holder The mounted bearing plate can be pushed away automatically with little pressure during assembly, allowing the snap hooks to be released from the brushes.

A particularly low-effort and space-saving arrangement of the snap hooks according to the invention is, according to one embodiment of the invention, in a hammer brush holder by means of a rocker-like snap hook which is integrally formed on a brush support plate provided as a brush holder via an elastically rotatable rocker axis, with a hook part lying in front of the rocker axis and extending axially to the motor interior.

molded hooks that engage radially behind the hammer brush holders and a hook part located behind the rocker axis with a pressure pin molded axially to the outside of the motor, whereby the axis and the front and rear hook parts are conveniently located in the plane of the brush support plate in the assembly position of the hammer brush holders and can be moved out of this plane by a short angle of rotation about the rotatable axis when the stop is actuated so far that the hooks behind the hammer brush holders unhook and the ^r -e are pulled into their operating position by their pressure springs resting on the commutator surface.

The invention is explained in more detail below using a schematically illustrated embodiment in the drawing; in which:

FIG 1 is an axial plan view of a brush support plate with two hammer brush holders held thereon in the assembly position;
FIG 2 shows a partial section from FIG 1 according to section line H-II;

FIG 3 shows a partial section of the commutator-side end of a commutator motor in a pre-assembly position of the bearing shield relative to the motor housing.

FIG 1 shows a brush support plate 3 with two pivotable hammer brush holders 6,7 attached to pivot pins 34,35. In the middle, the brush support plate 3 has a commutator opening 38 into which, when assembled ready for operation, a commutator 10 attached to a rotor shaft of the motor protrudes. The hammer brush holders, with carbon brushes inserted at their free ends, are pressed against the commutator surface by brush pressure springs 8,9; the brush pressure springs 8,9 are attached in a manner known per se with one end to the hammer brush holders 6,7 and with their other ends with molded-on eyelets are attached to retaining pins 36,37 which are axially molded onto the brush support plate 3.

FIG. 1 shows the assembly position of the hammer brush holders 6, 7, in which they are held at a distance from the commutator surface by the snap hooks 4, 5 integrated into the brush support plate 3 according to the invention. As can be seen from FIG. 1 and in particular from the detailed sectional view according to FIG. 2, snap hooks 4, 5 are an integral part of the brush support plate 3 for holding the hammer brush holders 6, 7 in their assembly position via elastically rotatable rocker axes 41 and 51. A hook 42 or 52 is arranged axially to the inside of the motor and engages radially behind the brush holders 6, 7 on one hook part lying in front of the rocker axes 41 and 51, and a pressure pin 43 or 53 is formed axially to the outside of the motor on a hook part lying behind the rocker axes 41 and 51. In the assembly position, the hook 42 or 52 engages behind the radial inner outer surface of the hammer brush holders 6,7 and thus fixes them in their assembly position. By axially pressing on the pressure pins 43, 53, the snap hook can be rotated against the elastic rotational force of the rocker axes 41,42 in such a way that the hooks 42,52 release the hammer brush holders so that they rest under the tension of the brush pressure springs 9,8 after assembly of the rotor with the commutator inserted into the commutator opening 31 of the brush support plate 3.

According to one embodiment of the invention, the assembly of the bearing plate 2 is used to press the pressure pins 43,53 of the brush support plate mounted in the motor housing 1 via radial tongues 31,32,33 in corresponding recesses 11 of the motor housing 1 axially in the direction of the arrow shown and thereby automatically and without further handling steps or manufacturing means to release the hammer brush holders 6.7 so that they are pulled into their operational position according to FIG with the brushes resting on the commutator surface of the commutator 10 by the brush pressure springs 8,9.

Claims (4)

1. Brush holder, in particular hammer brush holder, for a commutator motor with brushes held on a brush holder via a mechanical spacer in the assembly position at a distance from the commutator surface and in the operating state after removal of the spacer in contact with the commutator surface, characterized in that rocker-like snap hooks (4,5) are integrated into the brush holder (brush tray 3) which hold the brushes (brush holders 6,7) in the assembly position by directly or indirectly engaging behind them, which can be released from the brushes (hammer brush holders 4,5) by a molded-on stop (pressure pin 43,53) which can be actuated from the outside. 2. Brush holder with hammer brush holders (6 or 7) and with a plastic brush support plate (3) according to claim 1, characterized by a rocker-like snap hook (4 or 5) integrally formed on the brush support plate (3) via an elastically rotatable rocker axis (41 or M) with a hook part located in front of the rocker axis (41 or 51) with hooks (42 or 52) formed axially towards the inside of the motor and engaging radially behind the hammer brush holders (6 or 7) and a hook part located behind the rocker axis (41 or 51) with a pressure pin (43 or 53) formed axially towards the outside of the motor. 3. Brush holder according to claim 2, characterized in that the axis (41 or 51) and the front and rear hook parts in the assembly position of the hammer brush holders (6 or 7) lie in the plane of the brush support plate (3). Bk 2 Th / 20.06.1989 G 89 05 006.1 6 '^;""GRftf'G--il9b'b&·* 4. Brush holder according to at least one of claims 1-3, characterized in that the stop (pressure pin A3 or 45) can be pushed away by a bearing plate (2) mounted axially against the brush holder and the snap hooks (4 or 5) can thereby be released from the hammer brush holders (6 or 7).