Sleeve of braking leverage system of rail transport

FIELD: machine building.

SUBSTANCE: sleeve is made from composite polymer anti-friction material on the basis of polyamide containing carbon fibre or a mixture of carbon fibre with glass fibre as a fibrous filler. In addition, the material contains chaotic carbon nanotubes in the form of single-layer, multi-layer graphite planes with the number of layers of 2 to 70 or inserted into each other and bent into a tube; outside diameter of carbon nanotubes is 0.1 to 100 nm, and their length is 1 to 70 mcm. As a base, the material also contains polyamide mixture with 20-40 wt % of polyethylene caproamide. As material base polyamide, there used is polyamide 6, or Kaprolon B or Ertalon; content of fibre glass in its mixture with carbon fibre of fibrous filler of composite polymer anti-friction material is 3.48 to 10.5 wt % at the following component ratio, wt %: carbon fibre or a mixture of carbon fibre and fibre glass 9.7-42.4; carbon nanotubes 0.05-0.55; polyamide is the rest - up to 100%.

EFFECT: increasing sleeve service life due to considerable reduction of intensity of linear wear of a working layer of sliding at friction on polished steel pair from steel 40X, increasing stability of friction coefficient at friction on the material of counter body from steel 40X, and improving breaking stress at tension, preserving Charpy impact strength on specimens without any notch at simultaneous maintenance of the specified limit of compressive strength, as well as low friction coefficient at increase of its stability.

4 cl, 2 tbl

 

The invention relates to the field of engineering, namely for the manufacture of plugs lever brake system of a rail passenger or freight transportation, including subway cars operated without the use of grease.

Known bushing brake lever rail systems made of composite polymeric antifriction material based on polyamide, containing a fibrous filler carbon fiber or a mixture of carbon fiber with fiberglass (see RF patent №2441787, IPC VN 13/34, F16 33/04, 10.02.2012,).

However, the known bushing brake lever rail systems when its use has the following disadvantages:

- insufficient service life due to high total wear in the friction pair,

- lack of stability of the friction coefficient (0,66-0,72) when the friction material rear body steel 40X,

- high intensity linear internal wear of the working layer of sliding friction steel pair of steel 40X (5×10-5µm/km)

- lack of destructive tension tensile (160 MPa).

The objective of the invention is to develop bushing brake lever rail systems.

The technical result is to increase the service life of the bushing brake lever si is theme of rail transport due to the significant reduction of the intensity of linear wear of the working layer of sliding friction on polished steel pair of steel 40X, the stability of the friction coefficient of the friction material rear body steel 40X, increasing the destructive tensile stress, retention of impact strength by the Charpy samples without incision while maintaining the limit of compressive strength, and low coefficient of friction while increasing its stability.

The technical result in the implementation of the invention is achieved by the fact that the proposed bushing brake lever rail systems made of composite polymeric antifriction material based on polyamide, containing a fibrous filler carbon fiber or a mixture of carbon fiber with fiberglass, while the composite antifriction polymeric material further comprises randomly arranged carbon nanotubes as single-layer, multi-layer with the number of layers from 2 to 70 or nested in one another rolled in a tube of graphite planes, the outer diameter of carbon nanotubes is selected from 0.1 to 100 nm, and their length from 1 to 70 μm, as the basis of composition polymer anti-friction material further comprises a mixture of polyamide with 20-40 wt.% polyethylenepolyamine, at the same time as polyamide fundamentals of polymer composite antifriction material used polyamide , or Caprolon In or Ertalon, the content of fiber mixtures thereof with carbon fiber fibrous filler composite antifriction polymeric material selected from 3,48 to 10.5 wt.%, the next time quantitative content, wt.%:

carbon fiber or mixture

carbon fiber with fiberglassa 9.7-42,4,
carbon nanotubesfrom 0.05 to 0.55,
polyamidethe rest is up to 100%.

The carbon fiber of the fibrous filler composite antifriction polymeric material contains carbon fibers from high molecular weight of hydrate cellulose fibers or polyacrylonitrile fibers. When this carbon fiber polymer composite antifriction material is used in the form of tow, or chopped harness or cut the tape, and fiberglass used in the form of chopped strands, chopped length of string or ribbon carbon fiber and chopped strands of glass fiber selected from 1 mm to 48 mm, While the bushing brake lever rail systems preferably with an outer diameter of 30-50 mm, in the morning with a diameter of 20-40 mm and a length of 12-150 mm

Among the essential features characterizing the proposed bushing brake lever rail systems, distinctive are:

- additional content in the polymer composite antifriction material randomly distributed carbon nanotubes as single-layer, multi-layer with the number of layers from 2 to 70 or nested in one another rolled in a tube of graphite planes,

- select the external diameter of carbon nanotubes from 0.1 to 100 nm, length from 1 to 70 μm,

- as the basis of the composite antifriction polymeric material further comprises a mixture of polyamide with 20-40 wt.% polyethylenepolyamine, at the same time as polyamide fundamentals of polymer composite antifriction material used polyamide 6, or Caprolon In or Ertalon,

- select the content of fiber mixtures thereof with carbon fiber fibrous filler polymer composite antifriction material from 3,48 to 10.5 wt.%,

- select the following quantities of components of composite polymeric antifriction bushing material, wt.%:

carbon fiber or mixture
carbon fiber with fiberglass a 9.7-42,4,
carbon nanotubesfrom 0.05 to 0.55,
polyamidethe rest is up to 100%

content as carbon fiber fibrous filler polymer composite antifriction material carbon fiber, obtained from the high molecular weight of hydrate cellulose fibers or polyacrylonitrile fibers,

the use of carbon fiber composite antifriction polymeric material in the form of a harness, or chopped harness or cut the tape, and fiberglass in the form of chopped strands, chopped length of string or ribbon carbon fiber and chopped strands of glass fiber selected from 1 mm to 48 mm

- preferred implementation of the bushing brake lever rail systems with an outer diameter of 30-50 mm, with an inner diameter of 20-40 mm and a length of 12-150 mm

Experimental tests of the lever in brake systems of railway transport of friction pairs using the proposed sleeve and the counter-body of steel 40X with hardness HRC 32-38, and then full-scale sea trials of standard kit bushing lever brake system, showed their high efficiency. It was found that increased service life of the bushing lever brake system of a rail t is ansport at 16-18%, in this case the wear of the working layer of the proposed slip sleeve by friction on polished steel pair of steel 40X was 1×10-7-7×10-8µm/km, retained impact strength Charpy samples without an incision at the level of 45-55,8 kJ/m2. retained tensile strength at compression level 160-180 MPa and simultaneously increasing the destructive tensile stress to 174-201 MPa. At the same time it is found that the bushing brake lever rail systems have a coefficient of friction at the friction against the polished surface of the counter-body of steel 40X with hardness HRC 32-38 in the range of 0.11 to 0.16, with increased stability of the coefficient of friction of up to 0.89 to 0.92.

The proposed lever bushing brake system in the pair working since the beginning of full-scale sea trials and does not require its replacement up to the present time.

Table 1 presents the experimental compositions of the composite antifriction polymeric material based on polyamide used for the manufacture of the proposed bushings brake lever rail systems, while table 2 shows the standard specifications bushing brake lever rail systems.

Research impact strength was carried out on pendulum impact-testing machine Charpy method on samples of type 2 without an incision on HOST-80. Study of the characteristics of friction (tribology) proposed bushings brake lever rail systems was carried out on the machine friction umrs 2168.

Manufacturing technology proposed bushings brake lever rail systems for various purposes in the form of a continuous sleeve or split sleeve in the form of segments with working sliding surfaces is not required for its manufacture, use specific technological equipment and includes injection molding in the injection molding machine products specified geometric shapes from the composite antifriction polymeric material based on polyamide.

The proposed bushing brake lever rail systems easy to understand and does not require for its illustrations provide drawings.

The proposed bushing brake lever rail systems are compared with Bush - the prototype of the increased service life due to the significant reduction of the intensity of linear wear of the working layer of sliding friction on polished steel pair of steel 40X, have toughness on Charpy samples without an incision at the level of 45-55,8 kJ/m2, ultimate compressive strength at the level of 160-180 MPa and simultaneously increased the destructive voltage is of tensile to 174-201 MPa. In addition, the proposed bushing brake lever rail systems are characterized by high stability of the friction coefficient of the friction material rear body steel 40X while maintaining a low coefficient of friction and tensile strength under compression.

1. Bushing brake lever rail systems made of composite polymeric antifriction material based on polyamide, containing a fibrous filler carbon fiber or a mixture of carbon fiber with fiberglass, characterized in that the composite antifriction polymeric material additionally soda is incorporated randomly placed carbon nanotubes in the form of a single layer, layered with the number of layers from 2 to 70 or nested in one another rolled in a tube of graphite planes, the outer diameter of carbon nanotubes is selected from 0.1 to 100 nm, and their length from 1 to 70 μm, as the basis of the composite antifriction polymeric material further comprises a mixture of polyamide with 20-40 wt.% polyethylenepolyamine, at the same time as polyamide fundamentals of polymer composite antifriction material used polyamide 6, or Caprolon In or Ertalon, the content of fiber mixtures thereof with carbon fiber fibrous filler composite antifriction polymeric material selected from 3,48 to 10.5 wt.% the next time quantitative content, wt.%:

carbon fiber or mixture
carbon fiber with fiberglassa 9.7-42,4
carbon nanotubes0,05-0,55
polyamidethe rest is up to 100%

2. The sleeve according to claim 1, characterized in that the carbon fibers of the fibrous filler composite antifriction polymeric material contains carbon fiber, receive the TES of the high molecular weight of hydrate cellulose fibers or polyacrylonitrile fibers.

3. The sleeve according to claim 1, characterized in that the carbon fiber composite antifriction polymeric material used in the form of a harness or chopped tow, or chopped tape, and fiberglass used in the form of chopped strands, chopped length of string or ribbon carbon fiber and chopped strands of glass fiber selected from 1 mm to 48 mm

4. The sleeve according to claim 1, characterized in that preferably made with an outer diameter of 30-50 mm, with an inner diameter of 20-40 mm and a length of 12-150 mm



 

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1 tbl

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1 tbl

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EFFECT: higher efficiency and reliability.

4 cl, 5 dwg

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