JP7348508B2 - Disc brake device for railway vehicles - Google Patents

Description

The present disclosure relates to a disc brake device for a railway vehicle.

Disc brake devices are widely used as braking devices for railway vehicles. The disc brake device includes an annular brake disc and a brake lining. For example, the brake disc is fastened to a wheel and rotates together with the wheel. A brake lining is pressed against the brake disc. The brake disc and wheels are braked by the friction between the brake lining and the brake disc.

Brake discs of disc brake devices used in railway vehicles are required to have sufficient cooling performance in order to ensure their durability. In order to ensure cooling performance during braking, a plurality of fins are generally formed radially on the back surface of the brake disc. Each fin contacts the wheel and forms a ventilation path between the back surface of the brake disc and the wheel. The air passage allows air to pass from the inner circumferential side of the brake disc toward the outer circumferential side when the brake disc rotates together with the wheel. The brake disc is cooled by the air flowing through the air passage.

However, while the railway vehicle is running, air flows through the ventilation passage between the brake disc and the wheels, which generates aerodynamic noise. In particular, when a railway vehicle travels at high speed, the amount of ventilation in the ventilation passage increases, causing loud aerodynamic noise.

On the other hand, Patent Document 1 discloses a disc brake device in which circumferentially adjacent fins are connected by a connecting portion. In this disc brake device, the connecting portion forms a portion with the smallest cross-sectional area in each of the air passages between the fins. According to Patent Document 1, aerodynamic noise during high-speed running can be reduced by setting the total minimum cross-sectional area of the ventilation passages to 18,000 mm ² .

In Patent Document 1, a connecting portion for reducing aerodynamic noise is integrally formed with a disc body and fins of a brake disc. Therefore, the rigidity of the portion of the brake disc near the connecting portion is greater than the rigidity of other portions. Therefore, when the brake lining slides against the brake disk during braking and frictional heat is generated, the portion near the connection portion is less likely to be thermally deformed than other portions, and the brake disk is warped. As a result, the load on the bolts that fasten the brake disc to the wheel increases.

Therefore, Patent Document 2 proposes a technique in which a disc brake device is provided with an aerodynamic noise reduction member (control member) separate from the brake disc. The control member has a plate-shaped support portion and a plurality of protrusions protruding from the support portion. According to Patent Document 2, by blocking a portion of the ventilation passage with each protrusion of the control member, it is possible to suppress the flow of air in the ventilation passage and reduce aerodynamic noise generated while the railway vehicle is running. can. Furthermore, since the brake disc and the control member are separate parts, the protrusion of the control member does not affect the rigidity of the brake disc. Therefore, it is possible to prevent the brake disc from being warped due to the protrusion.

Japanese Patent Application Publication No. 2007-205428 International Publication No. 2019/194203

In the disc brake disc device of Patent Document 2, a control member separate from the brake disc is used to reduce aerodynamic noise. The control member is mainly composed of a plate-shaped support part and a plurality of protrusions. Methods for manufacturing this control member include, for example, forming a plate-shaped support part and a plurality of protrusions separately and joining them by welding, etc., or pressing a thin metal material to form the support part. and a method of integrally molding the protrusion. However, no matter which method is adopted, the complex shape of the brake disc must be taken into consideration. That is, it is necessary to accurately arrange the protruding part on the support part so as not to interfere with the large number of fins provided on the back surface of the disk body. Therefore, the labor and cost for processing the control member may increase.

An object of the present disclosure is to simplify the manufacture of a control member in a disc brake device for a railway vehicle that includes a control member for controlling the amount of airflow in an air passage.

A disc brake device according to the present disclosure is a disc brake device for a railway vehicle. The disc brake device includes a rotating member, a brake disc, and a control member. The rotating member is attached to the axle of the railway vehicle. The brake disc includes an annular disc body and a plurality of fins. The disk body has a back surface facing the rotating member. A plurality of fins are arranged radially on the back surface. The control member controls the amount of airflow between adjacent fins in the circumferential direction of the brake disc among the plurality of fins. The control member includes a base plate and a protrusion. The base plate is sandwiched between the rotating member and the fins. The protrusion protrudes from the base plate toward the disc body. A recess that circumferentially traverses the fin is formed on the top surface of each of the adjacent fins. The protrusion extends from one adjacent fin to the other in the circumferential direction through the recess.

According to the present disclosure, in a disc brake device for a railway vehicle that includes a control member for controlling the amount of ventilation in an air passage, manufacturing of the control member can be simplified.

FIG. 1 is a longitudinal sectional view showing a schematic configuration of a disc brake device for a railway vehicle according to a first embodiment. FIG. 2 is a back view of the brake disc included in the disc brake device shown in FIG. 1. FIG. 3 is a plan view of a control member included in the disc brake device shown in FIG. 1. FIG. 4 is a sectional view taken along the line IV-IV in FIG. FIG. 5 is a longitudinal sectional view showing a portion of the disc brake device for a railway vehicle according to the second embodiment.

The disc brake device according to the embodiment is a disc brake device for a railway vehicle. The disc brake device includes a rotating member, a brake disc, and a control member. The rotating member is attached to the axle of the railway vehicle. The brake disc includes an annular disc body and a plurality of fins. The disk body has a back surface facing the rotating member. A plurality of fins are arranged radially on the back surface. The control member controls the amount of airflow between adjacent fins in the circumferential direction of the brake disc among the plurality of fins. The control member includes a base plate and a protrusion. The base plate is sandwiched between the rotating member and the fins. The protrusion protrudes from the base plate toward the disc body. A recess that circumferentially traverses the fin is formed on the top surface of each of the adjacent fins. The protrusion extends circumferentially from one side of the adjacent fins to the other through the recess (first configuration).

According to the disc brake device according to the first configuration, the control member can control the amount of airflow between circumferentially adjacent fins on the back surface of the disc body of the brake disc. That is, in the disc brake device, the ventilation passage formed by the circumferentially adjacent fins together with the disc body and the rotating member is partially blocked by the protrusion provided on the control member. This makes it possible to limit the amount of ventilation in the ventilation passage and reduce aerodynamic noise generated when the railway vehicle is running.

In the disc brake device according to the first configuration, each of the fins adjacent to each other in the circumferential direction of the brake disc has a recessed portion on the top surface thereof that circumferentially traverses the fin. The protrusion of the control member extends circumferentially through the recess of the fin. That is, the portion of the circumferentially extending protrusion that corresponds to the fin can be accommodated in the recess of the fin. Therefore, when manufacturing the control member, it is not necessary to consider the position of each fin provided on the back surface of the disk body and to arrange the protrusion so as to avoid the fins. Therefore, the control member can be manufactured relatively simply, and the labor and cost for processing the control member can be reduced.

The protruding portion of the control member is preferably positioned on the inner peripheral side of the brake disc (second configuration).

For example, when removing foreign matter in the air passage formed by the rotating member and the brake disc, air is blown into the air passage from the inner peripheral side of the brake disc without disassembling the disc brake device. On the other hand, in the second configuration, the protruding portion of the control member is positioned on the inner peripheral side of the brake disc. Therefore, even if foreign matter such as dirt or mud becomes clogged between the protrusion of the control member that partially blocks the ventilation passage and the brake disc, the foreign matter can be easily removed. Therefore, the maintainability of the disc brake device can be improved.

The protruding portion of the control member may be positioned on the outer peripheral side of the brake disc (third configuration).

Embodiments of the present disclosure will be described below with reference to the drawings. In each figure, the same or equivalent components are designated by the same reference numerals, and the same description will not be repeated.

[First embodiment]
(overall structure)
FIG. 1 is a longitudinal sectional view showing a schematic configuration of a railway vehicle disc brake device 100 according to the present embodiment. The longitudinal section refers to a section taken by cutting the disc brake device 100 along a plane including the central axis X. The central axis X is the axis of the axle 200 of the railway vehicle. Hereinafter, the direction in which the central axis X extends will be referred to as the axial direction.

As shown in FIG. 1, the disc brake device 100 includes a rotating member 10, a brake disc 20, and a control member 30.

The rotating member 10 is attached to the axle 200 and rotates around the central axis X together with the axle 200. In the example of this embodiment, the rotating member 10 is a wheel of a railway vehicle. However, the rotating member 10 may be a disk body other than a wheel. The rotating member 10 shown in FIG. 1 includes a boss portion 11, a rim portion 12, and a plate portion 13. The plate portion 13 connects the boss portion 11 into which the axle 200 is inserted and the rim portion 12 that constitutes the outer peripheral portion of the wheel. The inner circumferential edge of the plate portion 13 is connected to the boss portion 11 via an arcuate curved portion 14 when viewed in longitudinal section of the rotating member 10 . The outer peripheral edge of the plate portion 13 is connected to the rim portion 12 via an arc-shaped curved portion 15 when viewed in longitudinal section of the rotating member 10 .

The brake discs 20 are provided on both sides of the disc-shaped rotating member 10. These brake discs 20 are fastened to the plate portion 13 of the rotating member 10 by a fastening member 40 composed of, for example, bolts and nuts. A brake lining 50 is provided outside each brake disc 20 in the axial direction. The control member 30 is arranged between the rotating member 10 and each brake disc 20.

(Detailed composition)
FIG. 2 is a view (back view) of one of the brake discs 20 disposed on both surfaces of the rotating member 10 when viewed from the rotating member 10 side. In FIG. 2, a 1/4 circumference portion of the brake disc 20 is shown. Hereinafter, the circumferential direction and the radial direction of the brake disc 20 will be simply referred to as the circumferential direction and the radial direction.

Referring to FIG. 2, brake disc 20 includes a disc body 21 and a plurality of fins 22. As shown in FIG.

The disk body 21 has an annular shape. The disk body 21 substantially has an annular plate shape with the central axis X as its axis. The disk body 21 has a sliding surface 211 and a back surface 212. The sliding surface 211 is a surface provided on one side of the disk body 21 in the axial direction. A brake lining 50 (FIG. 1) is pressed against the sliding surface 211 in order to generate braking force. The back surface 212 is a surface provided on the other side of the disk body 21 in the axial direction, and faces the rotating member 10 (FIG. 1).

The plurality of fins 22 are arranged radially on the back surface 212 of the disk body 21. These fins 22 extend from the inner circumferential side of the disk body 21 to the outer circumferential side. Each fin 22 protrudes from the back surface 212 toward the rotating member 10 (FIG. 1). Thereby, a space is formed between the rotating member 10, the circumferentially adjacent fins 22, and the disk body 21. These spaces serve as ventilation paths through which air passes when the brake disc 20 rotates together with the rotating member 10.

In this embodiment, some of the fins 22 are formed with fastening holes 23 that pass through the fins 22 and the disk body 21 . A concave keyway 24 is formed in the top surface 221 of the other fins 22 . A fastening member 40 (FIG. 1) is inserted into each fastening hole 23. A key (not shown) for regulating relative rotation between the brake disc 20 and the rotating member 10 (FIG. 1) is fitted into each keyway 24. The number of fins 22, the number of fastening holes 23, and the number of keyways 24 can be set as appropriate. In the example of this embodiment, all the fins 22 are formed with the fastening holes 23 or the key grooves 24, but there may be some fins 22 in which the fastening holes 23 and the key grooves 24 are not formed.

A recess 222 is formed in the top surface 221 of each fin 22 . Each of the recesses 222 circumferentially traverses the fin 22 in which the recess 222 is provided. The recess 222 is arranged on the inner peripheral side of the brake disc 20. These recesses 222 are arranged, for example, on an imaginary circle C concentric with the disc body 21 when viewed from the back of the brake disc 20.

In the example of this embodiment, the recess 222 of the fin 22 having the keyway 24 is arranged inside the keyway 24 in the radial direction so as not to overlap with the keyway 24. However, as long as the key (not shown) fitted into the keyway 24 does not interfere with the recess 222, a part of the recess 222 and a part of the keyway 24 may overlap. The recess 222 of the fin 22 having the fastening hole 23 is arranged inside the fastening hole 23 in the radial direction so as not to overlap with the fastening hole 23.

As shown in FIG. 2, the length of the keyway 24 in the radial direction is typically larger than the diameter of the fastening hole 23. Therefore, the radial positions of the plurality of recesses 222 corresponding to the plurality of fins 22 are usually determined based on the keyway 24 and the key (not shown). However, if the diameter of the fastening hole 23 is larger than the length of the keyway 24 in the radial direction, the radial position of the recess 222 can be determined based on the fastening hole 23.

FIG. 3 is a diagram (plan view) of the control member 30 viewed from the brake disc 20 side. In FIG. 3, a 1/4 circumference portion of the control member 30 is shown. In FIG. 3, in addition to the control member 30 (solid line), the brake disc 20 is shown with a chain double-dashed line.

The control member 30 is a separate member from the brake disc 20. The control member 30 controls the amount of ventilation between the fins 22 adjacent in the circumferential direction. Control member 30 includes a base plate 31 and a protrusion 32 .

The base plate 31 has a generally annular plate shape and is arranged substantially coaxially with the disk body 21 . The base plate 31 is sandwiched between the rotating member 10 (FIG. 1) and the plurality of fins 22. That is, the rotating member 10 contacts one surface of the base plate 31, and the top surface 221 of the fin 22 contacts the other surface of the base plate 31.

In the example of this embodiment, the radial length of the base plate 31 is slightly shorter than the radial length of the disk body 21. However, the radial length of the base plate 31 may be longer than the radial length of the disc body 21 or may be equal to the radial length of the disc body 21. The radial length of the base plate 31 can be set as appropriate within the range from the inner circumferential edge to the outer circumferential edge of the plate portion 13 (FIG. 1) of the rotating member 10.

A plurality of openings 311 are formed in the base plate 31 in correspondence with the fastening holes 23 of the brake disc 20 to allow the fastening members 40 (FIG. 1) to be inserted therethrough. Further, the base plate 31 is formed with a plurality of openings 312 corresponding to the key grooves 24 of the brake disc 20 in order to allow the above-mentioned keys (not shown) to be inserted therein.

Of both surfaces of the base plate 31, a protrusion 32 is formed on the surface on the brake disc 20 side. The protrusion 32 protrudes from the base plate 31 toward the disk body 21. The protrusion 32 is arranged at a position corresponding to the recess 222 of the fin 22 in the radial direction. In this embodiment, since the recess 222 is arranged on the inner circumferential side of the brake disc 20, the protrusion 32 is also positioned on the inner circumferential side of the brake disc 20. The inner peripheral side of the brake disc 20 refers to, for example, a region of the brake disc 20 that is radially inner than the axis of the fastening hole 23. A region of the brake disc 20 that is radially outer than the axis of the fastening hole 23 is the outer peripheral side of the brake disc 20 .

The protrusion 32 extends from one side of the circumferentially adjacent fins 22 to the other side, passing through the recess 222 in the circumferential direction. In the example of this embodiment, the protrusion 32 passes through the recesses 222 of all the fins 22 and extends in the circumferential direction. In other words, the protrusion 32 has a generally annular shape when the control member 30 is viewed from above.

The control member 30 can be made of a thin metal material having a thickness of 1.0 mm to 3.0 mm. The control member 30 is formed, for example, by pressing this thin material. In this case, the base plate 31 and the protrusion 32 are integrally formed. However, it is also possible to form the base plate 31 and the protrusion 32 separately and then fix the protrusion 32 to the base plate 31 by welding or the like.

Hereinafter, the relationship between the brake disc 20 and the control member 30 will be explained in more detail with reference to FIG. 4. FIG. 4 is a sectional view taken along the line IV-IV in FIG. In FIG. 4, for convenience of explanation, the rotating member 10 is also shown together with the brake disc 20 and the control member 30.

Referring to FIG. 4, in the brake disc 20, the recess 222 is a part that is depressed from the top surface 221 of the fin 22 toward the disc body 21 side. However, in order to ensure the heat capacity of the disk body 21, the recess 222 does not enter the disk body 21. That is, the bottom surface 222b of the recess 222 is substantially on the same plane as the back surface 212 of the disk body 21, or is located closer to the top surface 221 of the fin 22 than the back surface 212 is.

In the example of this embodiment, the recessed portion 222 has a generally L-shape in a longitudinal cross-sectional view of the brake disc 20 . The recessed portion 222 is defined by a bottom surface 222b and a side surface 222s on the keyway 24 side.

The protrusion 32 of the control member 30 protrudes from the base plate 31 toward the back surface 212 of the disk body 21 . A portion of this protrusion 32 that corresponds to the fin 22 is arranged within the recess 222 . The tip of the protrusion 32 does not come into contact with the back surface 212 of the disk body 21 or the bottom surface 222b of the recess 222. That is, a gap is formed between the tip of the protrusion 32 and the brake disc 20 to allow air to pass therethrough. The distance in the axial direction from the tip of the protrusion 32 to the back surface 212 of the disk body 21 is, for example, 0.5 mm to 4.5 mm.

The radially outer surface of the protrusion 32 may be in contact with the side surface 222s of the recess 222, or may be in non-contact. When the protrusion 32 is brought into contact with the side surface 222s of the recess 222 in advance, deformation of the protrusion 32 can be suppressed when the control member 30 rotates together with the rotating member 10 and the brake disc 20. Furthermore, when assembling the control member 30 to the brake disc 20, the control member 30 can be easily positioned.

The shape of the protrusion 32 can be determined as appropriate. The protrusion 32 may be formed hollow or solid. The surface of the protruding portion 32 preferably has a smooth shape without corners, from the viewpoint of smoothly guiding the air within the ventilation path. A portion of the protrusion 32 located at the boundary with the base plate 31 has, for example, a generally arcuate shape in a longitudinal cross-sectional view of the control member 30 . That is, the inner end 32i of the protrusion 32 has an R stop at the radially inner boundary with the base plate 31, and the outer end 32e of the protrusion 32 has an R stop at the radially outer boundary with the base plate 31. be.

The positions of the inner end 32i and outer end 32e of the protrusion 32, that is, the position and range of the protrusion 32, can be determined as appropriate. In the example of this embodiment, the inner end 32i is arranged slightly outside the inner peripheral edge of the disk body 21 in the radial direction. However, as long as the tip of the protrusion 32 is within the range of the disk body 21, the inner end 32i may be arranged radially inward than the inner peripheral edge of the disk body 21. The outer end 32e is arranged slightly inside the inner end 24i of the keyway 24 in the radial direction.

(effect)
In the disc brake device 100 according to the present embodiment, the protruding portion 32 of the control member 30 protrudes toward the disc body 21 side, and partially closes the ventilation path defined by the rotating member 10 and the disc body 21 and fins 22 of the brake disc 20. It's blocking the target. This makes it possible to limit the amount of ventilation in the ventilation passage and reduce aerodynamic noise generated when the railway vehicle is running.

In the disc brake device 100 according to the present embodiment, each fin 22 of the brake disc 20 has a recess 222 on the top surface 221 that crosses the fin 22 in the circumferential direction. The protrusion 32 of the control member 30 passes through the recess 222 of the fin 22 and extends circumferentially across the plurality of fins 22 . That is, a portion of the circumferentially extending protrusion 32 that corresponds to the fin 22 is accommodated in the recess 222 . Therefore, when manufacturing the control member 30, it is not necessary to consider the position of each fin 22 and form the protrusion 32 avoiding the fins 22. Therefore, the control member 30 can be manufactured simply, and the labor and cost for processing the control member 30 can be reduced.

In this embodiment, the protruding portion 32 of the control member 30 is positioned on the inner peripheral side of the brake disc 20. Therefore, by blowing air into the ventilation passage from the inner peripheral side of the brake disc 20, foreign matter stuck between the protrusion 32 and the brake disc 20 can be relatively easily removed. Therefore, the maintainability of the disc brake device 100 can be improved.

[Second embodiment]
FIG. 5 is a longitudinal sectional view showing a portion of the disc brake device 100A according to the second embodiment. The disc brake device 100A according to this embodiment basically has the same configuration as the disc brake device 100 according to the first embodiment. However, the disc brake device 100A differs from the disc brake device 100 in the position of the protrusion 32 of the control member 30A.

As shown in FIG. 5, the protruding portion 32 of the control member 30A is positioned on the outer peripheral side of the brake disc 20A. Correspondingly, the recesses 222 provided in each fin 22 of the brake disc 20A are also positioned on the outer peripheral side of the brake disc 20A.

In the example of this embodiment, the recess 222 has a substantially rectangular shape when viewed in longitudinal section of the brake disc 20A. That is, the recess 222 is defined by a bottom surface 222b and side surfaces 222s arranged on both sides of the bottom surface 222b.

The protruding portion 32 of the control member 30A protrudes from the base plate 31 toward the back surface 212 of the disk body 21 similarly to the first embodiment. The recess 222 accommodates a portion of the protrusion 32 that corresponds to the fin 22 . The protrusion 32 does not come into contact with the back surface 212 of the disk body 21 and the bottom surface 222b of the recess 222. However, the protrusion 32 may come into contact with at least one of both side surfaces 222s of the recess 222. When the protrusion 32 is brought into contact with one or both of the side surfaces 222s of the recess 222, deformation of the protrusion 32 during rotation is suppressed. Further, the control member 30A can be easily positioned with respect to the brake disc 20A.

In this embodiment, the inner end 32i of the protrusion 32 is arranged slightly outside the outer end 24e of the keyway 24 in the radial direction. The outer end 32e of the protrusion 32 is arranged inside the outer peripheral edge of the disk body 21 in the radial direction.

Also in the disc brake device 100A according to the present embodiment, the ventilation path defined by the rotating member 10, the fins 22 of the brake disc 20A, and the disc body 21 is partially blocked by the protrusion 32 of the control member 30A. . Therefore, it is possible to limit the amount of ventilation in the ventilation passage, and it is possible to reduce aerodynamic noise generated when the railway vehicle is running.

The protrusion 32 of the control member 30A can pass through the recess 222 of the fin 22 and extend in the circumferential direction across the plurality of fins 22, as in the first embodiment. Therefore, when manufacturing the control member 30A, it is not necessary to consider the position of each fin 22 and form the protrusion 32 avoiding the fins 22. Therefore, the control member 30A can be manufactured simply, and the labor and cost for processing the control member 30A can be reduced.

Although the embodiments according to the present disclosure have been described above, the present disclosure is not limited to the above embodiments, and various changes can be made without departing from the spirit thereof.

In the first embodiment described above, the protruding portion 32 of the control member 30 is positioned on the inner peripheral side of the brake disc 20. In the second embodiment, the protruding portion 32 of the control member 30A is positioned on the outer peripheral side of the brake disc 20A. However, the position of the protrusion 32 is not limited to the examples shown in these embodiments. For example, the protrusion 32 can be appropriately moved in the radial direction within the range from the inner circumferential edge to the outer circumferential edge of the plate portion 13 of the rotating member 10. That is, the inner end 32i and outer end 32e of the protruding portion 32 can be placed at any position within the range from the inner peripheral edge to the outer peripheral edge of the plate portion 13. However, the protrusion 32 is arranged so as not to interfere with the key and the fastening member 40.

In the above embodiment, the recess 222 provided in the fin 22 has an L-shape or a rectangular shape when viewed in longitudinal section of the brake disc 20, 20A. However, the shape of the recess 222 is not limited to this. The recess 222 may have a shape that follows the protrusion 32 of the control member 30, 30A.

In the embodiment described above, the base plate 31 and the protrusion 32 of the control members 30, 30A have a substantially annular shape when viewed from above. However, the control members 30 and 30A may be divided into a plurality of parts in the circumferential direction. The control members 30 and 30A may be divided into two or four parts in the circumferential direction, for example.

100, 100A: Disc brake device 10: Rotating member 20, 20A: Brake disc 21: Disc body 212: Back surface 22: Fin 221: Top surface 222: Recessed portion 30, 30A: Control member 31: Base plate 32: Projection portion

Claims (3)

A disc brake device for a railway vehicle,
a rotating member attached to the axle of the railway vehicle;
A brake disc including an annular disc body having a back surface facing the rotating member, and a plurality of fins arranged radially on the back surface;
A control member that controls the amount of airflow between adjacent fins in the circumferential direction of the brake disc among the plurality of fins, the control member including a base plate sandwiched between the rotating member and the fins, and a control member that controls airflow between adjacent fins in the circumferential direction of the brake disc; the control member including a protrusion protruding toward the main body;
Equipped with
A recess that crosses the fin in the circumferential direction is formed on the top surface of each of the adjacent fins,
In the disc brake device, the protrusion extends from one of the adjacent fins to the other, and extends in the circumferential direction through the recess. The disc brake device according to claim 1,
In the disc brake device, the protruding portion is positioned on the inner peripheral side of the brake disc. The disc brake device according to claim 1,
In the disc brake device, the protruding portion is positioned on an outer peripheral side of the brake disc.

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