Brake member

FIELD: mechanical engineering.

SUBSTANCE: brake member comprises ring provided with at least one face ring friction surface made of a carbon material and aspiration grooves made in the friction surface. The aspiration grooves are oriented transversally to the peripheral round contours of the face ring friction surface to define cross-pieces from the side of one of the peripheral round contours. The brake member is provided with additional grooves that are interposed between the cross-pieces of the aspiration grooves and whose exits face the peripheral round contour of the friction surface opposite to the direction of the exit of the aspiration grooves.

EFFECT: enhanced reliability and prolonged service life.

12 cl, 8 dwg, 1 tbl

 

The invention relates to means for transmitting rotational movement, in particular to the brakes with the axial location of the brake surfaces.

Known means for brakes, containing a circular ring, at least one end of the annular friction surface of the carbon material is subjected to surface hardening (see, for example, JP 7119777, F 16 D 69/00, 1995).

The drawback of such technical solutions is the use of reinforcing organic coating with additives so that they cannot be used in heavy-duty brakes.

The closest technical solution to the stated is the brake element containing a circular ring, at least one end of the annular friction surface of the carbon material, the suction grooves on the friction surface oriented transversely to the peripheral circular contours with the formation of jumpers from one of the peripheral circular contours (DE 7906416, F 16 D 65/12, publ. 31.05.1979).

Mentioned technical solution, typically used in high-load systems, when operating on the friction surface of developing high temperatures (up to 2500 degrees Celsius) and there is a circulation of air through the suction grooves acting as a centrifugal fan. In the same the conditions at the temperature of the working surface above 600° With the circulation of air through the suction grooves begins the process of oxidation of carbon, causing increased wear of the friction surfaces. In this technical solution is possible to increase the value and stability of the friction coefficient, but there is a significant reduction in resource brake element of a carbon material.

The task, which is aimed by the invention is the creation of an effective and reliable tool that increases the magnitude and stability of the braking torque and the operating life of the friction discs when working heavily loaded brake systems.

The technical result, which can be obtained by carrying out the invention, is to increase the coefficient of friction of the brake discs and its stability by ensuring free access of products of wear and desorbed gases and increase the service life of the friction elements by slowing down the oxidation process.

This technical result is achieved by the brake element containing a circular ring, at least one end of the annular friction surface of the carbon material, the suction grooves on the friction surface oriented transversely to the peripheral circular contours with the formation of bridges by one of peripher is inih circular paths, he has additional slots located between the ridges of the suction grooves and having access to the peripheral side of the circular contour of the friction surface, opposite to the direction of exit of the suction grooves.

And also due to the fact that the suction grooves made with a symmetrical arrangement and/or intersecting relative to the radial direction.

And also due to the fact that the suction grooves are made with varying degrees of reduced cross-section increasing in the direction of the exit.

And also due to the fact that the grooves are made straight.

And also due to the fact that the grooves are made curved.

The invention is illustrated by drawings, where figure 1 shows a schematic General view of the device, figure 2 is a schematic perspective view of the device with the suction grooves intersecting made and/or symmetrical arrangement relative to the radial direction, figure 3 - schematic perspective view of the device with the suction grooves made with the external circuit, 4 is a schematic perspective view of the device with the suction grooves made with a symmetrical arrangement relative to the radial direction, figure 5 - schematic perspective view of the device with the suction grooves made curved and intersecting with the balanced is their location relative to the radial direction, figure 6 - cross section a-a figure 1, figure 7 - section b-B of figure 1, and Fig - section b In figure 1.

The invention is illustrated also by the data table of the coefficient of friction and wear.

The brake element includes a circular ring 1, at least one end of the annular friction surface 2 made of carbon material. The friction surface 2 of the suction grooves 3, oriented transversely to its circular peripheral circuits 4 and 5. The suction grooves 3 is made with a jumper with 6 sides of a single circular peripheral contour, for example 4, and 7 on the other side circular peripheral contour, for example 5. The brake element provided with additional grooves 11 located between the ridges 6 of the suction grooves 3 in the area bounded by a circle that goes around the edge of the jumpers 6 and the peripheral circular path (in this example 4). Additional grooves 11 have exit 12 on the peripheral side of the circular path (in this example 4) of the friction surface 2 opposite to the direction of exit 7 of the suction grooves 3. This design promotes uniform wear of the friction surface 2 and increase the size and stability of the coefficient of friction.

In the particular case, to ensure the same performance brakes regardless of the direction of rotation is occurring and to eliminate a possible reduction in the effectiveness in the case of an error during Assembly of the brake suction grooves can be performed intersecting and/or symmetrical arrangement relative to the radial direction, for example, as grooves 8 and 9 in figure 2. and 3. In addition, the suction grooves 3 or 8 and 9 to ensure the best possible removal of the products of wear can be made straight or curved (figure 3) and with a variable throat section 10, increasing towards the exit 7 either by width or by depth or by both. To reduce stress concentration mentioned flow section may have a shape with rounded edges, and to improve the removal of wear products and to further protect the grooves from the oxidation of the surface grooves are subjected to surface hardening, for example by treatment with pyrocarbon or other hardening agent.

In the process of such a device output products of wear due to inertial and gravitational forces, as well as the movement of desorbed gases in the space of the main suction and additional grooves.

For example, the drawing in the radial direction by four end-to-end suction groove width of 2 mm on the friction surface of the brake system components of the stator-rotor of carbon-carbon composite material with an average diameter of 64 mm leads to an increase of the coefficient of friction by about 30% and increase the amount of wear about three times (table 1), i.e. the resource brakes is reduced by about three times. In the case of NAS is the basis of the suction slots on a circular ring with jumpers (blind) in accordance with the proposed design coefficient of friction increases substantially, and the amount of wear increases slightly (1 and 2 in table 1), i.e. the braking torque increases and resource brakes are almost not changed.

So, for example drawing on four radial groove width of 2 mm and with jumper leads to the decrease of the friction coefficient with a large number of decelerations (p.3 table 1). When viewed disks revealed that the grooves partially clogged wear products. In the case of applying the straight grooves with a jumper at an angle of 45 degrees to the radial direction or curved in an arc with a constant angle of inclination to the radial direction is 45 degrees, the coefficient of friction after 200 braking was almost unchanged (p.4 table 1). The slots were clean.

For example, the direction of rotation on the opposite leads to a decrease of the coefficient of friction of the brake element of the carbon-carbon composite material made in accordance with paragraph 2, to 0,245 is 0.260 after 40-70 braking. Upon examination, it was revealed that the grooves partially clogged wear products. In the case of applying the rectilinear grooves symmetrical positioning and/or intersecting relative to the radial direction of the friction coefficient after 200 braking did not change during the rotation of the disks in any direction (p.5 table 1). The grooves of one of the directions it was clean.

For example, the ri application of the four grooves with a width of 2 mm on the friction surface of the brake elements at an angle of 45 degrees to the radial direction of the friction coefficient was slightly lower than with continuous grooves (p.2 and p.4 table 1, respectively). In the case of coating on the friction surfaces of the brake system components of the stator-rotor additional grooves with a width of 2 mm, the friction coefficient increased to values typical for end-to-end grooves, and the amount of wear is practically not increased (P6 table 1).

So, for example, drawing on the friction surface of the brake elements on four main and 4 additional groove at an angle of 45 degrees to the radial direction with a width increasing in the direction of the external circuit is proportional to the radius, leads to increased friction and reduce the amount of wear (page 7 in comparison with the line 6, table 1, respectively).

So, for example, drawing on the friction surface of the brake elements on four suction groove at an angle of 45 degrees to the radial direction and 4 additional groove with a width and depth which increases in the direction of the external circuit is proportional to the radius, leads to an increase of the friction coefficient with a large amount of braking (p.8 compared to line 7, table 1, respectively).

Table
The brake element
No.Features a pair of friction Average values for the first 10 brakingAverage values for 50-60 brakingAverage values for 200-210 braking
The coefficient. FrictionThe wear on the side, µm/Decel.The coefficient. frictionThe wear on the side, µm/Decel.The coefficient. frictionThe wear on the side, µm/Decel.
1Without slots0,2450,600,2350,500,2400,65
2Four cross-cutting groove0,3201,650,3151,800,3351,85
3Four blind radial groove0,2850,850,22750,700,2550,70
4Four blind groove at an angle of 45°0,2800,750,2850,800,2800,75
5The system is non-symmetrical grooves at an angle of 45°0,2900,800,2950,850,2950,75
6Four blind groove, potoglou 45° and three additional groove0,3250,750,3200,650,3350,70
7Four blind groove of variable width at an angle of 45° and four additional slots0,3350,700,3400,700,3250,60
8Four blind groove of variable width, increasing cross-section at an angle of 45° and four additional slots0,3300,700,3350,650,3400,60

1. The brake element containing a circular ring, at least one end of the annular friction surface of the carbon material, the suction grooves on the friction surface oriented transversely to its circular peripheral contour, with the formation of jumpers from one of the circular peripheral contour, characterized in that it has additional slots located between the ridges of the suction grooves and having access to the peripheral side of the circular contour of the friction surface, opposite to the direction of exit of the suction grooves.

2. The brake element according to claim 1, characterized in that the suction grooves made with symmetry the NYM location and/or intersecting relative to the radial direction.

3. The brake element according to one of claims 1 and 2, characterized in that the suction grooves are made with varying degrees of reduced cross-section increasing in the direction of the exit.

4. The brake element according to one of claims 1 and 2, characterized in that the grooves are made straight.

5. The brake element according to one of claims 1 and 2, characterized in that the grooves are made curved.



 

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