JPS6053434B2 - Method and device for rubbing the tip of a current collecting brush made of metal-coated carbon fiber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for rubbing the tips of current collecting brushes made of metal-coated carbon fibers.

A large number of metal-coated carbon fibers having a micro diameter (approximately 7 μTTL) coated with aluminum, copper, silver, or an alloy thereof using the ion-blating method are bundled to an appropriate length, and the base end is Together with the conductive metal plate stacked on top of this, they are solid-phase diffusion bonded together by heat pressing, and the tip of the fiber bundle is made into a splitting part where the fibers are separated into brush-like shapes, and the tip of this splitting part is collected. A current collector brush with an electric sliding contact surface exhibits good characteristics in terms of contact voltage drop, current density, and no sparking if each carbon fiber is in uniform sliding contact with the slip ring or commutator. . However, if the carbon fibers are in non-uniform sliding contact, the current will concentrate on some of the carbon fibers and bring them into contact with the coating metal, causing the carbon fibers to stick to each other and reduce the splitting property, or cause melting. The coated metal particles may damage the surface of the slip ring or the like, causing problems such as accelerated wear or generation of sparks. Furthermore, in non-uniform sliding contact, the brush load must be increased in order to increase the contact area, so the long carbon fibers bend and the contact area with the slip ring, etc. increases, and from this point of view, the slip ring, etc. There is a risk of damage to the product. For the reasons mentioned above, it is necessary to sufficiently rub the tip of the current collecting brush made of metal-coated carbon fiber so that it comes into uniform contact with the mating sliding surface.

However, it usually takes a long time to perform the above-mentioned rubbing. An object of the present invention is to provide a method and apparatus for performing the above-mentioned rubbing simply and satisfactorily.

In order to achieve the above object, the gist of the present invention is to attach abrasive paper to a rotating body having the same diameter as the slip ring or commutator on which a brush made of metal-coated carbon fiber comes into sliding contact, and to bring the tip of the brush into sliding contact therewith. .

Embodiments of the present invention will be described below with reference to the drawings. In the figure, 1 is a brush made of metal-coated carbon fiber, 2 is its base end, 3 is a dividing part, and 4 is a rotating body with an outer diameter equal to that of the slip ring or commutator on which the brush 1 slides, and its outer peripheral surface. The abrasive paper 5 is tightly attached to the base.

The proximal end portion 2 is supported by a holder 6, and a spring 7 provided on the holder 6 presses the tip of the fiber splitting portion 3 against the abrasive paper 5. The pressing force is set to such an extent that the carbon fiber composition of the brush 1 is not excessively bent, and the circumferential speed of the rotating body 4 is set to such an extent that the metal covering the carbon fibers is not melted due to frictional heat. At this time, each metal-coated carbon fiber can be quickly rubbed together by the polishing or grinding action of the abrasive paper 5.

Since the abrasive paper 5 is generally thin, the brush 1 is rubbed against the slip or commutator in a good condition in which each carbon fiber is in uniform sliding contact. Normally, slip rings and commutators are prepared with several types of standard dimensions, and the one suitable for the specifications of the rotating electric machine is selected and used, so the rotating body 4 is also prepared according to the standard dimensions. If a slip ring or the like of non-standard size is used, the slip ring or the like that is actually used can be used as the rotating body 4, and the rotating electrical machine can be rotated by other power.

Instead of the abrasive paper 5, a rotating cutter having the same outer diameter as the rotating body 4,
Alternatively, a rotor 4 having a cutter attached to its outer periphery may be used.

The present invention has the above configuration, and has the effect of easily and quickly sliding the sliding surfaces of the current collecting brush made of metal-coated carbon fiber.

[Brief explanation of the drawing]

The drawing is a schematic elevational view of one embodiment of the invention. 1...Brush, 2...Base end, 3...
...Separating section, 4...Rotating body, 5...
Abrasive paper.

Claims (1)

[Scope of Claims] 1. A current collection brush in which a large number of metal-coated carbon fibers are bundled and their base ends are solid phase diffusion bonded to each other, and the tip of the brush-like branching part at the tip slides into contact with a slip ring or a commutator. The tip of the metal-coated carbon fiber is brought into sliding contact with abrasive paper attached to the circumferential surface of a rotating body having the same outer diameter as the slip ring or commutator to rub the tip of the splitting part. How to rub the tips of current collection brushes together. 2. A grinding brush on which the tip of a current collection brush comes into sliding contact with a slip ring or a commutator, in which a large number of metal-coated carbon fibers are bundled and their base ends are solid-phase diffusion bonded to each other, and the tip of the brush-like splitting part at the tip slides in contact with a slip ring or a commutator. A device for rubbing the tip of a current collecting brush made of metal-coated carbon fiber and having a rotating body having the same diameter as the slip ring or commutator with paper attached to the circumferential surface.