Railway disc brake with electrically isolated brake-shoe lining holder

FIELD: transport.

SUBSTANCE: disc brake comprises disc and support. When actuated by brake lever, said support thrusts brake-shoe lining arranged at holder against brake disc. Brake lever and brake-shoe lining are articulated by hinge. Brake lever and brake-shoe lining are electrically isolated.

EFFECT: ruled out feed of inverse current from rail to car body.

16 cl, 7 dwg

 

This invention relates to a disk brake for a rail vehicle containing the brake disc, and a covering disk brake caliper disk brake mechanism, which in the case of control using the brake lever presses the button on the holder brake pads brake pad to the brake disc, and brake lever holder and the brake pads are connected by a swivel.

In rail vehicles with electric drive, the phenomenon that is known as "stray currents", which consists in the fact that the electric currents of the earth and mass flow on almost unpredictable flow paths between the electrical design blocks or between parts of the body of the car. Often such "wandering currents, you can cope with the work, even using sophisticated ground.

One possible reason for these "stray currents" can be electric reverse currents, which are in a moving train in the event of actuation of the disk brake can leak out of the rail wheel and thence through the caliper disc brake and the truck in the back of the wagon.

In a standing motionless rail vehicle also experienced "stray currents" at the moment, when from the front of the path passed by another train.

"Stray currents" may cause harmful interference to on-Board the rail vehicle electronic devices, so that they can issue error messages or even not work. Due to this, may deteriorate the safety of the rail vehicle.

Especially large interference causes this phenomenon, in particular, in high-speed trains. On the one hand, the car body consists of light metal and is particularly well-electrically conductive. On the other hand, brake lining high-speed train in most cases made from a sintered alloy, which is also a good conductor.

To prevent the spread of "stray currents" are trying to eliminate in advance all possible in the rail vehicle entry points and sources of interference.

To prevent input electric reverse current from rail to truck switched to electric isolation mounting caliper disk brake mechanism on the trolley. However, the caliper of the disk brake has a large mass, so that the insulation when the movement is subjected to high mechanical loads. This makes the electrical isolation of the complex.

Efforts were also attempts to exclude a path for current accounts the isolation brake pads. For this purpose, the brake pad was fixed on the holder brake pads using an electrically insulating adhesive bonding. However, because the adhesive during the braking process must be able to withstand high thermal stress, the adhesive bonding is difficult.

The basis for this invention is the task of creating a disk brake for rail vehicles, in which it is possible in a simpler manner prevents the input electric reverse current from the rail in the back of the wagon.

The solution to this problem by using disc brakes with signs of paragraph 1 of the claims. Preferred embodiments of the invention are specified in dependent claims.

Disc brake according to the invention, characterized by the fact that between the brake lever and the holder of the brake pads is formed of electrical insulation. This has the advantage that the weight be isolated structural element is relatively small. Regardless of whether the disk brake in the form of a compact caliper disk brake or caliper disk brake with suspension earrings, a holder brake pads, which weight is about 5 kg, is easy compared to caliper disc brake the EIT mechanism, which has a mass of approximately 150-200 kg As subject isolation structural element has a relatively small mass, the electrical insulation can be made cheaper. This also contributes to the fact that the electrical insulation is removed from the friction surfaces of the brake lining so that it is in the braking process is subjected to less heating action. Due to this insulating material affects a lower temperature. Due to this insulating effect can be achieved with lower costs. Another advantage of the invention is that when the brake pad is completely worn out and the holder of the brake pads has a metal contact with the disk brake, remains stored insulating effect. The same applies to the case of loss of brake pads.

In a preferred embodiment, the pivot joint has one or more insulating parts which are isolated from each other brake lever holder and the brake pads. For isolating the execution swivel for specialists in this field of technology, in principle, have different structural features.

In a simple embodiment, it is possible in this arrangement to apply, for example, having the form of a sleeve of insulating cha the tee.

Structurally, the preferred may be an embodiment in which the hinged connection is made in the form of a hinge.

Piano hinge may be composed of the following structural elements:

the first hinge part which has first protrusions, which are formed on the holder brake pads on the opposite brake pad side;

the second hinge part, which has the second protrusions that are formed on the terminal side of the brake lever;

- while the first and the second protrusion has every holes, which in the assembled state are aligned with each other, with the openings of the first and/or second protrusions corresponding fixed sleeve, which form the anchor sleeve to pass through the hinge rod.

To save a track vehicle isolating steps over a long period of time, preferably when the separate parts of the hinge are located at a distance from each other. A simple way this is achieved due to the fact that on the front end of each sleeve is formed a shoulder which acts as a spacer between the hinge parts.

This is the preferred location in which lying adjacent to each other of the sleeve facing each other his shoulder. Due to it is about being anti-premikanju insulation products abrasion disc brakes. Electrical isolation between the brake lever and the holder of the brake pads is maintained also after a long time. This is of particular advantage, in particular, in high-speed trains, in which the product of abrasion can be electrically conductive.

The fastening sleeve in such a protrusion may be a simple manner by means of press fit.

As the material for the sleeve or insulating washers can serve as polymeric materials and/or ceramic materials.

Preferred for production is, in particular, resistant temperature of the plastic. This material can be, for example, polyamide or polytetrafluoroethylene. Such materials are known under the trademark KaptonŽ and TeflonŽ DuPont. They are able to withstand temperatures of 280°C, respectively, 350°C.

The preferred embodiment of the invention in which the holder brake pads suspended on the trolley rail vehicle via a second swivel using a design with hanging earrings, characterized by the fact that the second swivel is made of electrically insulating. Due to this it is achieved that when this design with hanging earrings interrupted the path of current flow between the rail and the body of the car. Such a caliper disk brake the EIT mechanism with hanging earrings has the advantage of what braking force is transmitted almost exclusively through the pendant earrings in the bogie frame. Due to this reduced the load on the brake lever. According to the invention, in this construction the holder brake pads are also electrically separated from the truck. Therefore, the path for current input reverse currents is interrupted in this case.

Preferred relative to manufacturing execution caliper disk brake with hanging earrings may be such that the hinge connection between the holder brake pads and structure with pendant earrings again apply insulating sleeve, respectively, insulating washers.

Regardless of whether the disc brake design in a compact caliper disk brake or caliper disk brake with suspension earrings, a significant advantage of the invention is that the brake pad and/or the holder brake pads can simply be replaced without the need for exposure of the entire disc brakes acceptance with the security check. Such departmental admission is always difficult. Another significant advantage is that you can easily retool already operated disc brake.

For further p is the clarity of the invention is described below, which are the other preferred embodiments of the details and modifications of the invention with reference to the accompanying drawings, which depict:

figure 1 is a first exemplary embodiment of the invention, when the disk brake is designed as a compact caliper disk brake mechanism, and electrical insulation is made between made in the form of a hinge of the hinged parts that connect the holder brake pads with the brake lever;

figure 2 - the holder brake pads located, according to the invention, the insulating bushings in the top view;

figure 3 is a partial section of the holder brake pads, according to figure 2, in side view;

figure 4 - section of the hinged connection between the holder brake pads and brake lever in an enlarged scale;

5 is another exemplary embodiment of the invention, with a disc brake made in the form of a caliper disc brake with hanging earrings and a holder brake pads is connected to the trolley by means of the H-shaped pendant design;

6 is another embodiment of a caliper disk brake with hanging earrings, the holder brake pads is connected to the trolley by means of the I-shaped pendant design;

7 is another embodiment of the su is port disk brake mechanism with hanging earrings the holder brake pads is connected to the trolley by means of the Y-shaped pendant design.

Figure 1 shows in isometric projection of the disk brake 1 according to the invention, for a rail vehicle. The support plate 9 of the disc brake mechanism is fixed with screws on the chassis frame. Caliper 9 disk brake mechanism has a tension device 10, which in the case of actuation of the disk brake 1 brake lever 11 acts on the holder 4 brake pads and presses due to this, the brake pad 3 and the brake disc 5. The connection between the brake lever 11 and the holder 4 brake pads by using swivel 7. This swivel 7 is designed as a hinge. As follows from the following descriptions with reference to figure 4, piano hinge 7 essentially consists of a hinged rod 6 which passes through the holes in the fork lugs 12, respectively, 13 and rests in them. When the protrusions 12 formed on the holder 4 brake pads, and the protrusions 13 on the brake lever 11.

In the example implementation, each of the protrusions 12 forms a support bracket to the sleeve 2. The sleeve 2 is made of plastic. This isolation between the brake lever 11 and the holder 4 brake pads is CPA is additional simple since the mass of the brake pads 3 and the holder 4 brake pads (approximately 4 kg) is much less compared to the weight of the caliper 9 disc brake (approximately 150 kg).

Mount bushing 2 in the hole of the protrusion 12 is carried out by means of press fit (however, it is also possible that the insulating sleeve 2 is pressed into the holes of the protrusions 13).

Figure 4 shows separately the holder 4 brake pads in the top view; figure 3 holder 4 brake pads shown in the side view. According to the invention, between the hinge rod 6 (see figure 4) and the holder 4 brake pads made insulation in the form of sleeves 2. Each sleeve 2 has a shoulder 14 (see figure 3). Sleeve 2 is held by press fit in the hole in the ledge 12. The holes are aligned along the axis 8. Each projection 12 forms a support bracket to the sleeve 2. The location chosen so that in lying adjacent to each other bushings 2 corresponding sleeve 2 are opposite to each other by their shoulder 14.

Figure 4 shows in sectional view in enlarged scale of the hinge connection between the brake lever 11 and the holder 4 brake pads. The hinge 7 is, as mentioned above, on the merits of the rod 6, which is mounted in insulating bushings 2 tabs 12 of the holder 4 brake pads. Between adjacent protrusions 2 is a corresponding protrusion 13 of the brake lever 11. Between the lip 13 and the fork lugs 12 are made in the axial direction of the gap 15, whose width is determined by the shoulder 14 of the sleeve 12. This ensures that even after a long operating time deposits products abrasion does not lead to premikanju electrical insulation in the gap 15.

Figure 5, 6, 7 shows embodiments of the invention, in which the holder 4 brake pads are additionally connected with designs 24, 25, 26 with hanging earrings with trolley 28. In the disk brake of this design the braking force is almost entirely directed through the structure 24, 25, 26, with pendant earrings in the bogie frame 28. Mount caliper disk brake mechanism must perceive essentially only its own weight and residual moments braking effort.

Shown in the figure 5 embodiment, the pendant earrings attached to the holder brake pads on the outside, so that the electrical insulation can be executed again in a simple way with the sleeves 22 with the shoulder.

In the shown figure 6 embodiment, on the basis of the screws on the outer end lying horizontally finger swivel 27 required outside the corresponding insulating washer 23.

Shown in Fig.7. a Y-shaped structure 26 with hanging earrings also provided lying " snar the LM insulating washer 23.

The insulating effect between the holder 4 brake pads and a corresponding construction 24, 25, 26 with hanging earrings may be made, of course, also by means of insulating sleeves and insulating washers.

Using the disk brake according to the invention, it is possible both when the compact design of the caliper disk brake mechanism and the design of the caliper disk brake with hanging earrings effectively prevent the entrance of reverse currents, so that "stray currents" can be distributed much less.

As at performance in a compact caliper disk brake mechanism and caliper disk brake with pendant earrings can be simple and economical to carry out the electrical isolation of the holder brake pads.

Another great advantage of the invention is the fact that you can just equip operated disc brakes. Difficult delivery with a proof of security is not required, since there are already admitted brake pads.

An additional advantage is that even with strong wear of the brake linings is saved insulating effect even when the brake pad wears down below the permissible amount of wear.

The list of items

1 Disk t is RMOS

2 Bushing, insulating part

3 Brake pad

4 Holder brake pads

5 Brake disc

6 Hinge pin, finger

7 Swivel

8 Axis

9 Caliper disk brake mechanism

10 Tensioner

11 Brake lever

12, the Protrusion 4

13, the Protrusion 11

14 Shoulder

15 Gap

22 Sleeve for construction with hanging earrings

23, the Insulating washer

24 H-shaped design with hanging earrings

25 I-shaped design with hanging earrings

26 Y-shaped design with hanging earrings

27 Second swivel

28 Truck.

1. Disc brake for rail vehicles, comprising:
- brake disc (5),
- covering the brake disk (5) caliper (9) disk brake mechanism
which in the case of actuation by means of the brake lever (11) presses the button on the holder (4) brake pads brake pad (3) to the brake disk (5), the brake lever (11) and the holder (4) brake pads are connected by a swivel (7), characterized in that the brake lever (11) and the holder (4) brake pads are made of electrically isolated from each other.

2. Disc brake according to claim 1, characterized in that the swivel (7) has at least one ring is the dominant part, which electrically separates the brake lever (11) and the holder (4) brake pads.

3. Disc brake according to claim 2, characterized in that at least one insulating part is made in the form of a sleeve (2).

4. Disc brake according to claim 3, characterized in that the pivot joint (7) is designed as a hinge.

5. Disc brake according to claim 4, characterized in that piano loop includes:
the first hinge part which has first protrusions (12), which are formed on the holder (4) brake pads facing away from the brake pads (3);
the second hinge part, which has the second protrusions (13), which is formed on the end side of the brake lever (11);
while the first and second projection (12, 13) has openings, which in the assembled state are aligned with each other, with the openings of the first and/or second protrusions (12, 13) is fixed to the corresponding sleeve (2), which form the anchor sleeve to pass through the hinge rod (6).

6. Disc brake according to claim 5, characterized in that each sleeve (2) on the front end has a shoulder (14).

7. Disc brake according to claim 6, characterized in that the sleeve (2) lying adjacent to each other of the projections (12) are located opposite each other with their shoulder (14).

8. Disc brake according to claim 4 or 6, characterized in that the fastening sleeve (2) is Tertii the first or the second projection (12, 13) is carried out using a press fit.

9. Disc brake according to claim 3, characterized in that each sleeve (2) is made of polymeric material.

10. Disc brake according to claim 3, characterized in that each sleeve (2) made of a ceramic material.

11. Disc brake according to claim 9 or 10, characterized in that each sleeve (2) has a wall thickness greater than 2 mm

12. Disc brake according to claim 6, characterized in that the shoulder (14) of the sleeve (2) has an axial width greater than 2 mm

13. Disc brake according to claim 9, characterized in that the sleeve (2) is made of polyamide or polytetrafluoroethylene.

14. Disc brake according to claim 1, characterized in that the holder (4) brake pads suspended on a carriage (28) of the rail vehicle by means of a second swivel (27) and structures (24, 25, 26) with hanging earrings, while between the holder (4) brake pads, and design (24, 25, 26) with pendant earrings made of electrical insulation.

15. Disc brake according to 14, characterized in that the electrical insulation between the holder (4) brake pads, and design (24, 25, 26) with hanging earrings are formed by means of the sleeve (22), which is made of an insulating material.

16. Disc brake according to item 15, wherein the second pivot joint (27) is designed as a hinge.



 

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