HU192941B - Clamping of brush-spring of micromotors - Google Patents

Abstract

The invention relates to the Buerstenfederbefestigung in plastic bearing plate of micro motors, especially micromotors. The object of the invention is to carry out the brush spring attachment in the end shield so that it can be made from the outside as the last operation of the motor assembly. According to the invention this is achieved in that the brush spring having the shape of a torsion spring is fastened in a slot in the spring clip by clamping and the assembly is secured by nutfoermigen entries in the plastic bearing plate. In this plastic bearing plate is therefore a hole for centering and a groove for preventing rotation of the spring clip. The axial securing takes place by welding the plastic material or by screwing on a cap.

Description

BACKGROUND OF THE INVENTION The present invention relates to a brush spring mounting for miniature motors, in particular micromotors in a plastic bearing shield.

It is known that the brush spring mounting of the dwarf motors is soluble or insoluble in the brush holder or in the insulated part of the clock transmission system.

However, these known solutions have the disadvantage that they require the pre-installation of a power transmission system equipped with a brush-spring already installed. However, this installed brush spring slows down the assembly of dwarf motors, especially micro-motors. This requires increased labor input, which is the final assembly of the engines! costs. In addition, there is a risk that the brushes will be damaged, which could lead to a deterioration or failure. Grinding (factory-ordered) brushes for demanding applications is only possible under difficult conditions.

It is an object of the present invention to overcome the above-mentioned drawbacks and to provide a brush spring anchorage in the bearing shield so that it can be performed externally as the last step of the engine assembly.

The object has been achieved by providing a torsion spring fastening, wherein the torsion spring tongue spring is inserted into a slot formed in a spring bracket, the assembly made from the spring tongue and tongue spring being grooved and grooved in the tongue the brush spring assembly is secured axially in the free plane at the edge of the groove in the end face of the plastic bearing shield by welding or by screwing a cap where the end face of the cap fits snugly against the face of the plastic bearing shield.

Figure 1 b

Figure 2

Figure 3

Figure 4

Figure 4 b

Figure 4c

Figure 5 a Figure 5 b

Figure 5 c

The brush spring mounting according to the invention is described in more detail below in connection with an exemplary embodiment, with reference to the accompanying drawing, wherein:

1 is a side view of a spring bar; an axial view of the end of the spring bar; a side view of the brush spring; illustrated by the spring bar brush assembly with brush guides; a partial view of a plastic bearing shield; the plastic bearing shield a

4 is a sectional view of A-A in the figure; a cross-section of the plastic bearing shield; that is a partial view of the cap; Figure 5A-A is a partial view; that is the cross-section of the cap; the

Figure 6 shows the motor in a semi-sectional half-sectional view.

The spring bar 1 of Fig. 1a has a slit 2 in which the stem 3 of Fig. 4 is clamped in Fig. 2. In this way, the spring bar 1 and the brush spring 4 shown in Fig. 3 form an assembly. The plastic bearing shield 5 of Fig. 4 has a bore 6 and a groove 7 on its end face 19, which are interconnected by a groove 8 and serve to secure an externally mounted unit, namely a spring bracket 1 with a brush spring 4. The latter is thus disposed axially abutment and secured simultaneously in a radial and tangential direction. The plastic bearing shield 5 also has 12 holes. THE

Fig. 4b shows a groove 8 at the front face 19 of the plastic bearing shield 5 (see Fig. 4c). The assembly of the spring bar 1 and the brush spring 4 is locked in the still free shaft region by welding the plastic to the front face 19 of the plastic bearing shield 5 or by means of the end face 9 of the cap 10 shown in FIG. 4. it is secured by the hole 12 of the figure with the screws 13 of the plate 13 of the figure 6. In this way, the end face 9 of the cap 10 rests on the front face 19 of the plastic hinge 5 and closes the groove 8. It is apparent from the sectional view A-A in Fig. 5b that the bore 11 is formed in the cap 10 of Fig. 5a.

Under these prerequisites, it is possible to assemble the motor with a housing 14 and a rotor 15, as well as a ball bearing 16 and a plastic bearing shield 5 (see Figure 6), such that the final assembly of the spring can be retracted. Figure 3 illustrates the attachment of the brush spring to a .17 brush guide and a plug connector 18.

Claims (1)

Patent Claim Point Brush spring attachment for dwarf motors, in particular micromotors coupled to a dwarf motor by means of a plastic bearing shield, characterized in that the torsion spring-shaped brush spring (4) is inserted in a slit (2) formed in a spring bracket (1) The assembly thus formed is internally connected via a groove (8) and a groove (7) connected to the bore (6) formed in the plastic bearing shield (5), and the assembly consisting of the spring shackle (1) and the brush spring (4) a plastic bearing shield (5) at the front face 5 L9Z9II (19) (annual groove (8) for ilene; with welding stitch or (θ) firmly seated on the plastic bearing pedestal by screwing a cap (10) on the front surface (19) of the shield (5).