SU1181026A1 - Current collector - Google Patents

Abstract

CURRENT DEVICE, containing a contact ring with protrusions on the working surface, separated channels, and a cylindrical brush, characterized in that, in order to increase reliability, the projections are made in the form of a rhombus, the major axis of which is perpendicular to the axis of rotation, while the cylindrical surface brushes in contact with the edges of the projections of one of the channels.

Description

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Chsh | This invention relates to current collection devices. The aim of the invention is to increase reliability. FIG. 1 shows a current collection device; in fig. 2 shows section A-A in FIG. 1. The working surface 1 of the contact ring 2 is made of rhombic shape 3, separated by channels 4. Brush 5 is in contact with the edge 6 of the protrusions 3 of one of the channels 4. FIG. 2 denotes the diameter d of the cross section of the brush 5, the width h of the channel 4 between the edges of the projections 3, is equal to the chord connecting the contact point with the ring 2 at the cross section of the brush 5; contact force R. When the condition is met, the brush touches the edges of the projections 3. The fulfillment of the condition is necessary. Thus, for example, with the straight coal shape of the channel 4 (Fig. 2) and with the brush 5, the brush 5 will fail and contact of the brush 5 with the edges of the projections will not be ensured. A second condition regarding the width is also necessary. channels 4, so that the width of the channels 4 between the edges of the projections 3 is equal to the chord connecting the brush 5 and the contact ring 2 at the cross-section of the brush 5. When the channel is V-shaped, its width between the edges of the projections may be less than brushes, but when this brush will touch the inclined walls of the protrusions, and not their edges . Collector device operates as follows. When the contact ring 2 rotates, the brush 5, with the contact force P and force of friction at the points of contact of the edges of the projections 3 (Fig. 2), slipping along the edges of the projections 3, deviates in the transverse direction along the generatrix of the contact ring 2 (Fig. 1) . When transversely moving in the brush 5 due to the elastic deformations, a force arises, tending to return the brush 5 to the neutral position. With a certain deviation of the brush 5, the equilibrium state of the brush 5 sets in and the brush 5 tends to reach the surface of the projections 3. When the projections 3 reach the surface, the brush 5 abruptly moves to a neutral position, and acoustic noise and sharply transient contact resistance increase. To prevent the occurrence of limiting equilibrium conditions, the size of the small axis of the protrusion 3 is chosen less than the maximum allowable deflection of the brush 5. Therefore, the brush 5, deviating by an amount equal to half the size of the small axis of the protrusion 3, upon further rotation of the contact ring 2, moves to its original position. Thus, when the contact ring 2 rotates, the brush 5 makes periodic transverse movements, slipping along the edges of the projections 3 and not EXITING to their surface. Improved contacting is achieved due to the fact that on the sharp edges of the projections 3, unfavorable conditions are created for the formation of strong, non-conductive films and the depth of the channels 4 exceeds the thickness of these films, as well as due to the smooth sliding of the brush 5 along the projections 3 and high specific pressures at points contact between the brush 5 and the ring 2. The height of the projections 3 is selected depending on the diameter of the brush 5, so that the latter does not touch the bottom of the channel, and taking into account the wear of the material of the brush 5 and the ring 2 and the thickness of the films formed on the surface slip ring during operation of a collector device. The formation of diamond shaped protrusions 3 on the surface of the contact ring is easily achieved by cutting channels 4 onto the ring surface, for example, similarly to threading, but during forward and reverse cutter cutting.

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Claims (1)

PRECISION DEVICE containing a contact ring with protrusions on the working surface, separated by channels, and a brush of cylindrical shape, characterized in that, in order to increase reliability, the protrusions are made in the form of a rhombus, the large * axis of which is perpendicular to the axis of rotation, while the cylindrical surface of the brush in contact with the edges of the protrusions of one of the channels. contact When fulfilled, the edges of the condition h <d