Sintered friction pad for a disc brake of a rail vehicle

 

(57) Abstract:

The invention relates to the field of railway transport and for the design of the brake pads of disc brakes. A friction pad for a disc brake half rate or speed of a rail vehicle includes five is made in the form located with a gap relative to each other frictional sectors with rounded corners, each of which is rigidly connected with the metal substrate, the shape of which conforms to the shape of this friction element. Friction segment elements are arranged and fixed on Telnice. The Central friction segment element is made symmetrical shape with respect to a plane passing through the axis of rotation radius corresponding to the external arcuate path, and the other of the friction segment elements located on each side of the Central segment of the element is asymmetric shape. The area of contact with the brake disc medium side friction segment element is less than the contact area between the Central friction segment element and more the contact area between the extreme friction segment element. Technically the properties of the friction material lining within the specified time. 2 C.p. f-crystals, 2 Il.

The invention relates to the field of railway transport and for the design of the brake pads of disc brakes for mobile units half rate and high-speed trains.

Known friction pad for a disc brake of a rail vehicle containing a friction element mounted on the metal substrate, associated with Shoe, with the square of the friction element is made of deep radial groove depth, the smaller the thickness of the friction element, separating the last six separate segments (EP 0324911, 61 H 5/00, publ. 19.02.92).

The disadvantage of this friction lining is its fragility, due to the small life. Friction lining for units of rolling stock to ensure the required braking torque have a developed surface area. The size of the area in contact with the brake disc surface of the friction element is calculated from the calculated desired braking torque based on the properties of the friction material used for lining. While such parameters friktionen with appropriate control samples, produced in strict accordance with the technology of obtaining this material. And limits of extruded samples or products determined by the maximum pressure that may develop press, as the process of pressing the charge is directly associated with a specific pressure developed by the press and implemented in a given area pressing. In the manufacture of the friction element with a developed surface, for example a friction element disc brakes for units of rolling stock, in press limited ultimate pressure is not implemented by specific pressure to the desired pressing force. The resulting friction element does not have sufficient density structure of the material, causing the manifestation of those properties that are obtained with small control samples. As for cold pressing well mixed powder charge in the matrix is the process lack of seal and ordering patterns of the pads, when using this pad with the disc brake when braking violated the temperature regime, in which the friction pad is losing their properties such as wear resistance and the friction material or a violation of technology, the pads do channels for improving thermal fatigue of the friction surface, providing heat to the environment. Execution shaped brake friction linings with a developed contact surface, which is the replaceable node of the disk brake, slightly increases the service life, but greatly complicates the process of their manufacture.

Known friction pad for a disc brake of a rail vehicle containing four friction segment element arranged with a gap relative to each other and mounted on a common substrate, associated with Shoe (SU 462754, 61 H 5/00, publ. 20.05.75).

For solving the problem of reduction of the high temperature developed in local areas on the friction surface of each friction segment element is cut to the substrate in order to increase the surface area from which heat is removed, the output into the atmosphere. In addition, the grooves act as ways of heat output.

The disadvantage of this lining is that after receiving friction products performed by mechanical cutting of grooves in the working surface of the lining, resulting in the cut is razlyublyu material when working friction products and weakening friction properties due to the reduced contact area. When cutting grooves often happens chipped extreme layers.

In addition, when mechanical cutting grooves in the material formed microcracks, aggravating the chipping particles pads due to the fact that the friction work is the development of these micro-cracks due to the fact that during the slipping of the friction discs is heating and the heating of the environment. In this regard, in the microcracks particles into the environment during its expansion begin to exert pressure on the walls of the cracks, causing their development.

In this regard, used for disc brake friction lining have small service life and require constant monitoring by the degree of wear and tear.

In accordance with the above we can formulate the following areas, which are basic in the manufacture of friction products for disc brakes of a vehicle train. These include: to avoid violation of the structure of the material should be excluded machined billet pads after its formation at cold pressed to preserve intact the structure of the material and ensure an orderly density mutazioni segment items ordered by the density of the material, in which the properties of the obtained products correspond to the properties of the control samples made from this material, providing heat removal. Achievable technical result is to increase operational durability and reliability while maintaining the same properties of the friction material lining within the specified time.

This technical result is achieved in that the sintered friction pad for a disc brake of a rail vehicle, mainly half rate or speed, containing friction segment elements associated with celnikom, with each of these elements is located with a gap relative to the adjacent friction segment element, it contains five of the friction segment elements, each of which is made of metal with rounded corners and is rigidly connected with the metal substrate, the shape of which conforms to the shape of this friction element, all of the friction segment elements are made with holes for elements of their attachment to Telnice, and the area adjoining the average lateral friction segment element is smaller than the area at segmentnode element, the Central friction segment element is made symmetrical shape with respect to a plane passing through the axis of rotation radius corresponding to the external arcuate contour formed by all of the friction segment elements on Telnice, and other friction segment elements located on each side of the Central segment of the element is asymmetric shape.

Moreover, the inner loop formed by all of the friction segment elements on Telnice, consists of two symmetrical arcuate sections, stretched from the plane of symmetry of the Central friction segment element before the beginning of the angular transition of the internal circuit of the extreme friction segment element in the side of the path, with each of these arcuate sections formed by the arc of a circle made by the radius of the pivot point which is offset relative to the pivot point of the radius corresponding to the external arcuate contour formed by all of the friction segment elements on Telnice.

As the fastening elements of the friction segment items to Telnice can be used rivets.

Thus the side walls adjacent races shall be located relative to each other with a gap. And as the fastening elements of the friction segment elements can be used rivets.

The present invention is illustrated by a specific example, which, however, is not only possible, but clearly demonstrates the possibility of achieving the desired result.

In Fig. 1 shows a friction pad for a disc brake of a railway train;

in Fig. 2 - section a-a in Fig. 1.

According to the present invention sintered friction pad for a disc brake of a rail vehicle, mainly half rate or speed, contains a friction segment elements associated with celnikom, with each of these elements is located with a gap relative to the adjacent friction segment element. It contains five of the friction segment elements, each of which is made of metal with rounded corners and is rigidly connected with the metal substrate, the shape of which conforms to the shape of this friction element. All of the friction segment elements are made with holes for elements of their attachment to Telnice.

The area adjoining segmentnode element and more the contact area between the extreme friction segment element, the Central friction segment element is made symmetrical shape with respect to a plane passing through the axis of rotation radius corresponding to the external arcuate contour formed by all of the friction segment elements on Telnice, and other friction segment elements located on each side of the Central segment of the element is asymmetric shape.

The inner loop formed by all of the friction segment elements on Telnice, consists of two symmetrical arcuate sections, stretched from the plane of symmetry of the Central friction segment element before the beginning of the angular transition of the internal circuit of the extreme friction segment element in the side of the path, with each of these arcuate sections formed by the arc of a circle made by the radius of the pivot point which is offset relative to the pivot point of the radius corresponding to the external arcuate contour formed by all of the friction segment elements on Telnice.

As the fastening elements of the friction segment items to Telnice used rivets.

Below is an example of a specific implementation Frikz what remained.

Friction plate (Fig. 1) for disc brakes half rate or speed of a rail vehicle is composed of five separate friction segment elements respectively one Central 1, two medium 2 and the two extreme 3 segment elements, each of which is made with rounded corners. Each friction segment element represents the element 4, made of friction material and rigidly connected with the metal substrate 5, the shape of which conforms to the shape of this frictional sector. All of the friction segment elements are made with holes 6 for rivets for attachment segment item to Telnice 7 or cheek disc brakes. As the friction material used cermet composition PMK-79 the following chemical composition, wt.%:

Copper, Cu - 10

Sulfate barium, BaSO4- 7

Graphite, C - 5

Green silicon carbide, SiC - 6

Boron nitride, BN - 3

Iron, Fe (base) - 69

All components are in the form of powders are mixed in the mixer until a uniform distribution of the components in the volume of the prepared mixture. Then the mixture is hung in the sample, then the sample mixture socialsim 630 tons. Resulting molded friction element made of metal is placed on a steel substrate and subjected to sintering in a shaft furnace under pressure. After sintering the obtained friction segment element is subjected to machining (drilling holes for rivets, which is provided by attaching the segment to the cheek or Telnice disc brakes).

Frictional properties of the following sectors:

The coefficient of friction is 0.3 to 0.4

The stability coefficient of friction not less than 0,7

The wear rate of metal-ceramic, Ám/Decel, no more to 12.0

The intensity of wear of the counterbody of cast iron, Ám/Decel, no more than 9,0

Hardness to machining, HRF - 80-105

In the General case on the cheek or Telnice friction segment elements can be arranged so that the side walls located adjacent the friction segment elements are direct fit to each other. In this case, heat from the friction surface is carried out through the rivets on the hull elements disc brakes and side surfaces of the segmental elements directly into the environment. To enhance the process of the heat sink and remove part of sporogony relative to each other with a gap, thus forming the channels for conventional heat sink.

The area of contact with the brake disc medium side friction segment element is less than the contact area between the Central friction segment element and more the contact area between the extreme friction segment element.

The surface area of the friction lining disk brake is selected from the conditions of maintenance on the brake disk of the desired braking torque, which is implemented in the specified temperature range not exceeding the maximum permissible limits heating of the friction material. Another condition that ensures operational reliability and durability of the friction linings is receiving sealed with a given density and composition structure of the material itself.

The last condition is limited to the real possibilities of achieving the desired surface pressure during pressing of the friction part of the overlay. So, when using the composition type PMK-79 to obtain a molded friction segment with the required density structure of the material you create during pressing of the charge unit pressure from 5 to 7 t/cm2. The implementation is limited to a set amount of friction segments, in combination the components of the pad with the desired surface area. For the friction lining disk brake train half rate or speed of the composition is equal to the number of selected five as the most optimal. When performing covers of the four radial elements cannot be obtained when pressing the desired structure of the extruded segment, since the area of each segment exceeds for forging equipment limit on the area where a possible implementation of the specific pressure of 5-7 t/cm2. When the number of segments up to six or seven and more realized the condition for obtaining the friction segment elements with the given internal structure, but this decreases the surface area of the plates, the dimensions of which are aligned with the dimensions of Telnice or host disk brake, to which the strap is attached. The reduction in area due to the fact that the segment elements are stacked on a substrate or base (Telnice) with a gap relative to each other. These gaps form radial channels for heat sink and output of wear particles from the working surface of the lining in the mode of clamping pads and the brake disc. Increase which reduces the dimensions of the working area, defined, as already mentioned, the overall size of the disk brake.

The Central friction segment element 1 has a symmetrical shape relative to the plane 8, passing through the axis of rotation of the radius R corresponding to the external arcuate contour of a circular sector formed by all of the friction segment elements on Telnice. Other friction segment elements 2 and 3 located on each side of the Central segment element 1 made asymmetrical shapes. The area of contact with the brake disc medium side friction segment element is less than the contact area between the Central friction segment element and more the contact area between the extreme friction segment element. The performance friction pads allows for the efficient and smooth its interaction with the brake disc. This feature by configuring the marginal areas of the friction pads for disc brakes of a railway train is reflected in FR N 2681925, F 16 D 69/04, 61 H 5/00, 02.04.99, DE N 4231549, F 16 D 69/04.

The inner loop formed by all of the friction segment elements on Telnice, consists of two balanced the enta 1 prior to the beginning of the angular transition of the internal circuit of the extreme friction segment element 3 in lateral outline. Each of these arcuate sections formed by the arc of a circle, made of radius r, the pivot point which is offset relative to the pivot point of the radius R corresponding to the external arcuate path.

The present invention is industrially applicable as its production does not require the use of special technology than what is currently used for the production of friction elements of the brake mechanisms.

1. Sintered friction pad for a disc brake of a rail vehicle, mainly half rate or speed, containing friction segment elements associated with celnikom, with each of these elements is located with a gap relative to the adjacent friction segment element, characterized in that it contains five of the friction segment elements, each of which is made of metal with rounded corners and is rigidly connected with the metal substrate, the shape of which conforms to the shape of this friction element, all of the friction segment elements are made with holes for elements of their attachment to Telnice, and the size medium fit what about the item and more the contact area between the extreme friction segment element, the Central friction segment element is made symmetrical shape with respect to a plane passing through the axis of rotation radius corresponding to the external arcuate contour formed by all of the friction segment elements on Telnice, and other friction segment elements located on each side of the Central segment of the element is asymmetric shape.

2. Pickguard for p. 1, characterized in that the inner loop formed by all of the friction segment elements on Telnice, consists of two symmetrical arcuate sections, stretched from the plane of symmetry of the Central friction segment element before the beginning of the angular transition of the internal circuit of the extreme friction segment element in the side of the path, with each of these arcuate sections formed by the arc of a circle made by the radius of the pivot point which is offset relative to the pivot point of the radius corresponding to the external arcuate contour formed by all of the friction segment elements on Telnice.

3. Pickguard for p. 1, characterized in that the fastening elements of the friction segment items to use Telnice

 

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