RU2286264C2 - Current collector contact shoe and method of its operation - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to device for transmission of electric current from supply source to consumers. Cover plate contains housing made of ferrous metal in which soft-metal cups (for instance, made of copper alloy) are installed on thread. Thread is cut in inner holes of cups, and holes proper are filled up with current-conducting surface-active material. Said material contributes to transfer, in process of operation (friction), of particles on bushing material onto counter-body (contact rail).

EFFECT: provision of conditions for selective transfer (no wear effect) at operation of cover plate rail friction pair, with resulting increased wear resistance.

3 cl, 1 dwg

Description

The invention relates to devices for transmitting electric current from a power source to power-consuming mechanisms and devices, in particular to current collectors transmitting electric energy from a current-carrying rail (bus) to actuators (electric motors and automation devices) in subway cars, in particular to replaceable shoes current collectors in direct contact with the current-carrying rail.

Known designs of shoes that are attached to the spring-loaded part of the current collector using bolts [1]. A common drawback of these shoes is their low wear resistance, which is due to adverse working conditions (friction of steel on steel or cast iron in the absence of lubrication).

The closest prototype in its functional purpose is a contact pair [2], containing a brush made of a non-heat-treated gold-copper alloy and a counterbody made of base metal galvanically coated with a layer of noble metal and using colloidal graphite as a lubricant. The disadvantage of this current collector is its increased cost and the inability to transmit large amounts of electric current.

A new technical result of the invention is to create a current-transmitting shoe design that ensures constant lubrication of the friction zone with a thin layer of copper alloy during its operation, which acts as a solid lubricant and thereby provides more favorable friction conditions compared to existing shoe designs.

The drawing shows the proposed design of the shoe.

The design consists of a steel casing 1, in which from three to twelve cups 2 made of copper alloy and having a thread on both the outer and the inner surfaces are installed in its part in contact with the contact rail. The number, size and location of the glasses is set based on the condition of the most complete overlapping of the friction zone when moving the shoe relative to the rail. Glasses having an external thread M 12, an internal thread M 8, and in an amount of 5 to 7 pcs are most optimal. Inside the glasses located on the periphery (3-5 pieces), there is a filler 3, which is a conductive surfactant that promotes high-quality application of the material of the glasses on the friction surface. Inside the remaining glasses there is a filler 4, which contributes to the occurrence of the wearless effect (selective transfer during friction) during friction of the shoe about the rail [4]. Substances 3 and 4 are kept inside the glasses from falling out with the help of an internal thread. As substance 3, any composition for coating copper alloys by the friction method can be used, for example, composition [3]. As substance 4, for example, copper oleate can be used.

The work of the proposed shoe design is as follows. The shoes are mounted on the spring-loaded current collectors alternately with conventional shoes, made without holes, glasses and fillers, through 1-5 cars. In the process of moving the composition of the cars using the shoes of the proposed design, a thin (1-3 μm) layer of copper alloy is applied to the contact rail. In this case, the friction of the remaining shoes begins to occur in the lubrication mode. The role of the lubricant is played by a thin layer of copper alloy. In addition, since the filler substance has surface-active properties, the friction of all shoes against the rail begins to occur in the mode of selective transfer (wear-free friction) [4], resulting in a sharp decrease in the wear of the shoes and the contact rail. Due to the foregoing, the claimed method and design of the shoe can reduce the wear of the shoes (including ordinary shoes, standing in between the shoes of the claimed design) up to 12 times.

Information sources

1. Subway car model 81-717. Part 1. M .: Vneshtorgizdat, Ed. No. 4000935 a s, p. 61, fig. 3.

2. Auth. testimonial. USSR No. 875491. Contact pair for sliding low-current contacts. Bulletin of inventions 1981, No. 39; MKI H 0 11/02.

3. Auth. testimonial. USSR No. 635155. Surfactant by rubbing. Bulletin of inventions 1978, No. 44; MKI S 23 S 17/00.

4. Improving wear resistance based on selective transfer. Ed. By D.N. Garkunov. M .: Mechanical Engineering, 1977.

Claims (2)

1. The shoe of the current collector, comprising a housing, a metal spreading material of soft metal and lubricant, characterized in that the metal spreading material of soft metal is made in the form of threaded cups installed in the housing of the shoe by external threads, and the lubricant has surface-active and conductive properties and is located inside the cups having an internal thread that keeps the grease inside them from falling out. 2. A method of ensuring the operation of all the shoes of the current collector of the carriage composition in the wear-free mode, characterized in that the shoes equipped with soft metal cups with surface-active and conductive lubricant are installed alternately with monometallic shoes, which facilitates the transfer of the soft metal of the cups through the current-carrying rail to monometallic shoes.