CS241920B1 - Dovetail commutators' tightening device with central matrix - Google Patents

Abstract

For modern DC machines with great use of interior space and with dovetail commutators with central nut the usual device can no longer be used for tightening the central matrix that the barbs behind the commutator ribs were caught, because commutators have full pouidro 9 drilled, vent holes · Devices it is screwed in for tightening the nut into a nut thread (50) in the housing (4) commutator (2).

Description

( ⁵⁴ ) Dovetail commutator tightening device with central nut

In modern DC machines with large internal use and dovetail commutators with central nut, the conventional central nut tightening device, which has been caught by the teeth of the commutator ribs, can no longer be used, as the commutators have a full housing of 9 drilled ventilation holes. screwed into the nut (50) thread in the commutator housing (4).

241 920

241 920

The invention relates to a device for tightening dovetail commutators with a central nut, in particular for tightening commutators on rotors of DC machines.

In the manufacture of dovetail commutators with a central nut, the procedure is such that it is not usually necessary to tighten the commutator after the commutator has been mounted on the shaft or later in operation.

However, there are rare instances where the commutator needs to be tightened, for example, as a result of overheating after soldering or after an increased speed test. In the case of highly utilized machines, more recently, central matrix commutators with a larger lamella length to commutator diameter ratio have been increasingly used, in which the thermal spacers account for a substantial part of the total stress and where deformation stability is substantially narrower than previously used dovetail commutators. with relatively short lamellar wreath. With such commutators, there is an increased likelihood of tightening during manufacture after the commutator has been mounted on the shaft. The use of such commutators forces the use of the interior of the machine, whereby it is necessary to keep the commutator diameter with respect to the peripheral speed as small as possible, while the relatively long rotor beam requires the greatest possible shaft diameter with respect to critical speeds. When tightening the commutators with the central nut, the clamping ring must be pushed into the lamella ring with a force so that the central nut is released and can be tightened. Until now, the pressing of the commutator ring into the lamella rim has been performed by a device with catches and claws that have slipped between the ribs of the housing and twisted thereafter, so that the force exerted on the tightening ring has been absorbed by the ribs on the commutator housing.

241 920

An example of such a central nut commutator tightening device is given in Doroguš G, J ·, Tram and Trolleybus Elektrodvigatěl, pp. 62-63, Energija, tloskva 1964.

However, the described gripping of the commutator with the central nut by the ribs on the commutator housing is not possible in modern cramped constructions of such commutators where the ribs do not occur and where ventilation holes are drilled in the full housing. Neither of these ventilation openings, eg after threading, can be used to fasten the central nut tightening device, since the pitch diameter of the ventilation openings in the housing is generally larger than the bore of the housing on the outside of the commutator.

These difficulties are eliminated in the dovetail commutator tightening device according to the invention.

The principle of the invention is that the housing of the device is provided with an external thread for screwing into the nut thread in the commutator housing.

The threaded thread in the commutator housing is provided for screwing in the mounting and dismounting attachments, and according to the invention it is also used for screwing in the commutator tightening device with the central nut and the force filling by which the clamping ring is pressed into the lamella ring.

An exemplary embodiment of the invention is illustrated in the accompanying drawings, in which Figures 1 and 2 are a partial longitudinal section through an anchor of a DC machine with dovetail commutator with a central nut.

On the shaft 1 / fig. 1 / a dovetail commutator 2 with a central nut 3 is provided. A nut thread 50 is provided in the bore of the commutator 2 housing 4. The housing 6 of the central nut tightening device 3 has an external thread 51, a flange 7 with push-offs.

241 920 screws 8a with new holes 9 for accessing the notches 12 in the central nut 3 '. 10 and push the commutator withdrawal ring 11 into the lamella ring _o This releases the central nut 3, which can then be tightened by the notches 12 through the kidney holes 9 in the flange 7.

FIG. 2 shows another variant of the method of tightening the central nut 3. On the housing 6 of the commutator tightening device with the central nut is rotatably centered a circular key 13 with teeth 14 which engage notches 12 in the central nut 3. engaging the central nut 3 by springs 15 and pivoting with the levers 16 inserted into the radial holes 17 in the ring key 13 «,

Claims (1)

SUBJECT OF THE INVENTION A device for tightening dovetail commutators with a central nut, consisting of a housing of a device with a flange and pushing screws for resting either directly or by means of a circular plate against a commutator tightening ring, characterized in that the half nut (6) 3) is provided with an external thread 751 (for screwing into the nut thread (50) in the housing (4) of the commutator (2),