RU2365005C2 - Composite split brush with locking element - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and covers designs of brushes of electric machines operated at higher mechanical and electrical loads, for example rolling stock traction motors. Radially, every brush is separated into current-feed and plug-in elements with contact surfaces making a movable lock (dovetail or oval) to allow fixing the brush position in brush holder hole, good electric contact and replacement.

EFFECT: longer life (by 30 to 50%), depending upon design of brushes.

1 dwg

Description

The invention relates to electrical engineering and relates to electrographic brushes for electric machines operating in conditions of increased electrical and dynamic loads, for example, traction electric motors of railway and urban transport.

A well-known brush for an electric machine, containing a platform for a pressure device, beveled obliquely relative to the axis at an angle in the upper plane, with certain ratios of the angle of inclination of the platform to the value of specific pressing and certain ratios of the tangential and radial dimensions of the cheek (RF patent No. 2150772, CL H01R 39/18 39/40).

The use of this design of the brush makes it possible to stabilize the current collection process and to eliminate the formation of a “double mirror” on the contact surface of the brushes, however, the brush’s resistance to external disturbing forces from the frictional force in the sliding contact zone is not ensured, which also leads to covering of the collector plates. In addition, this technical solution allows the use of solid brushes only, which does not meet the requirements for switching an electric machine with limiting values of electric power in conditions of high electrical and dynamic loads.

A well-known brush for an electric machine, consisting of two split parts with current-carrying wires, with separate pressing on each part of the pressure element (A. Bordachenko, B. V. Gnezdov. "Collector-brush assembly of traction electric machines of locomotives." M: Transport, 1974, 158 pp., P. 19, Fig. 3.4, 20 prototype). From the point of view of contact stability, uniform distribution of pressure, this is the most favorable solution.

The proposed electric brushes (RF patent No. 2274935 C1, class H01R 39/18, H01R 39/40 2006.01) consist of two split parts: conductive and working with contact planes. The contact planes of the split parts form a wedge directed towards the contact surface with an angle of 124-152 °, and the ratio of the wedge angle to the pressure value is chosen to be 2.48-4.34 degrees kPa. The ratio of the tangential size to the radial size of the working element, measured from the top of the wedge angle to the contact surface, is 0.70-0.85.

These electric brushes showed their performance during field tests, for example, Gorky - Sorting. Electric locomotive VL80S.

The compound brush (RF patent No. 51792 Ul, H01R 39/40 2006.01) also showed good performance on city electric transport in Kazan and other cities of Russia.

A significant drawback of all these brushes is in operation, where it is necessary for maintenance (TS) and technical repairs (TP) to check the brush stroke in the brush holder window by pulling or changing them. When changing brushes to TP, the wearing part is very difficult to remove from the brush holder window, especially if there is no rotary beam at the electric motor, and also to check its height and technical condition.

The objective of the invention is to simplify the change and control of the electric brush during operation on TO and TP and increase reliable information about its condition. The operation of this electric brush is no different from the standard, used in a given period of time on rolling stock of railway and public transport. It steadily transfers pressing to the collector and thereby ensures stable electrical contact between the collector and the composite detachable brush, despite the presence of a lock part. At the same time, all the characteristics of the electric brush are preserved: physical, mechanical, chemical and collector.

The advantage of the proposed model of the electric composite detachable brush is the presence of the locking part, which is made on a movable landing, with the contact planes in the form of a dovetail or oval. This design allows you to fulfill all the requirements of the instructions for maintenance and repair of the collector-brush assembly of traction electric vehicles of rolling stock in operation.

The invention of the proposed composite split brush with a locking part is illustrated in the drawing.

A composite detachable electric brush with a lock part is installed in the sleeve 1 of the brush holder and consists of two parts: the main 2, through which power is supplied from the brush-containing device, and a removable graphite insert 3, sliding on the collector 4, the clamp is pressed against the collector using a spring 5. Position a compound detachable brush in the window of the brush holder is fixed by the locking part 6, which is made on a movable landing, in the form of a dovetail or oval, which also provides good electrical contact As the electric machine is in operation, the replaceable graphite insert must be height-controlled.

Thus, a composite detachable electric brush with a locking part ensures ease of changing the wearing part on all types of scheduled repairs (TO and TP) of the rolling stock.

INFORMATION SOURCES

1. RF patent No. 2150772, cl. H01R 39/18, 39/40.

2. RF patent No. 2274935 C1, cl. H01R 39/18, H01R 39/40 2006.01.

3. BORDACHENKO A.YU. GNESDILOV B.V. Collector-brush assembly of traction electric machines of locomotives. - M.: Transport, 1974, p.19, fig. 3, fig. 4, fig. 20.

4. RF patent No. 51792 U1, H01R 39/40 2006.01.

5. Diesel locomotives type TE10M. Operation and maintenance manual 2139.00.00.000 OM. M .: "Transport", 1985, p. 327.

Claims (1)

An integral detachable electric brush with a lock part is installed in the collector-brush assembly of an electric DC machine, which includes a brush holder and this electric brush installed in it, spring-loaded towards the collector by a pressure mechanism, characterized in that this electric brush is made integral detachable with a lock part, consisting of from the upper part with the current-carrying wire fixed on it and the lower replaceable part with the contact planes on the movable landing made by profile dovetail or oval and the profile plays the role of the castle.