Braking system, auxiliary brake control device

Abstract

To provide a brake device capable of reducing a work load relating on operation of a preliminary brake in a case where a regular brake cannot be used.SOLUTION: A brake device 1 includes: a brake mechanism 2 for pushing a shoe 21 against a braked member of a railway vehicle, and braking the railway vehicle; a DC motor 43 different from a motor 33 for driving the brake mechanism 2; a battery 41 different from a vehicle power source 31 for supplying power to the DC motor 43; and a relay circuit 42 for controlling supply of power to the DC motor 43 from the battery 41, according to a preliminary brake command. The battery 41 supplies DC power, the DC motor 43 drives the brake mechanism 2 on the basis of the DC power, and the relay circuit 42 switches a route between the battery 41 and the DC motor 43 according to the preliminary brake command.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the braking technology of railway vehicles.

Background Art

[0002] Patent Document 1 discloses an electric brake actuator including a normal brake mechanism unit that drives a push rod provided with a friction material pressed against the wheels of a railway vehicle by the rotational power of a motor, and a standby brake mechanism unit that moves the push rod using the force of a spring. In this document, when the normal brake mechanism unit cannot operate due to a power failure or the like, the standby brake is actuated by a push rod that moves by the force of a spring accumulated in the standby brake mechanism unit to safely stop the railway vehicle. After the return from a power failure, the normal brake mechanism unit is operated to generate the maximum braking force, and the spring is accumulated again using the reaction force.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technology described in Patent Document 1, when the normal brake mechanism unit cannot operate, the standby brake actuated by the spring cannot be released. Therefore, for example, it is necessary for a worker who has gone to the site to manually return the push rod in the spring accumulation direction to release the standby brake.

[0005] The present invention has been made in view of such a situation, and an object thereof is to provide a braking device or the like that can reduce the work load related to the operation of the standby brake when the normal brake cannot be used.

Means for Solving the Problems

[0006] To solve the above problems, a braking device according to one aspect of the present invention comprises a braking mechanism that brakes a railway vehicle by pressing a friction material against a braked member of the railway vehicle; a backup motor different from the normal motor that drives the braking mechanism; a backup power supply different from the normal power supply that supplies power to the backup motor; and a power supply control unit that controls the supply of power from the backup power supply to the backup motor in response to a backup brake command.

[0007] According to this embodiment, even if the primary motor and / or primary power supply are unavailable, the auxiliary brake can be activated by the auxiliary motor and auxiliary power supply.

[0008] Another aspect of the present invention is a pre-brake control device. This device comprises a pre-brake power supply different from the normal power supply, a pre-brake motor different from the normal motor that drives a friction material pressed against a braked member of a railway vehicle to brake the railway vehicle based on the power supplied from the pre-brake power supply, and a power supply control unit that controls the supply of power from the pre-brake power supply to the pre-brake motor in response to a pre-brake command.

[0009] Furthermore, any combination of the above components, as well as conversions of the expression of the present invention between methods, apparatus, systems, recording media, computer programs, etc., are also valid embodiments of the present invention. [Effects of the Invention]

[0010] According to the present invention, the workload related to operating the auxiliary brake when the regular brake is unavailable can be reduced. [Brief explanation of the drawing]

[0011] [Figure 1] A schematic diagram of the braking device according to the first embodiment is shown. [Figure 2] A schematic diagram of the relay circuit is shown below. [Figure 3] This shows the combination of commands for applying the auxiliary brake and releasing the auxiliary brake from the vehicle's driver's cab. [Figure 4]A schematic diagram of the braking device according to the second embodiment is shown. [Figure 5] A schematic diagram of the braking device according to the third embodiment is shown. [Figure 6] A schematic diagram of the braking system according to the fourth embodiment is shown. [Modes for carrying out the invention]

[0012] Figure 1 schematically shows the configuration of the braking device 1 according to the first embodiment. The braking device 1 comprises a brake mechanism 2, a service brake unit 3, and a reserve brake unit 4 as a reserve brake control device. The reserve brake is sometimes called a safety brake, backup brake, or emergency brake. The service brake unit 3 and the reserve brake unit 4 are controlled by commands from the brake command unit or control unit 5.

[0013] The brake mechanism 2, which constitutes a tread brake, includes a shoe 21 as a friction material that is pressed against the wheel, which is the braked member of the railway vehicle, to brake the railway vehicle. The shoe 21 faces at least a portion of the outer circumference of the wheel, and a brake lining or the like is provided on its facing surface (inner circumference). As will be described later, when the shoe 21 is driven in the radial direction of the wheel by the service brake unit 3 or the reserve brake unit 4 and is pressed when it comes to the brake action position where it contacts the wheel, the rotation of the wheel is slowed down by the frictional force between the brake lining or the like and the wheel, and the railway vehicle is braked.

[0014] The brake mechanism 2 may be configured as a disc brake, and instead of the shoe 21 used in tread brakes, pads may be provided as the friction material. The pads sandwich the brake disc, which rotates integrally with the wheel, from both sides in the direction of the rotation axis, and brake linings or the like are provided on the surface facing the brake disc. When the pads are driven in the direction of the wheel's rotation axis by the service brake unit 3 or the reserve brake unit 4 and pressed when they reach the braking position where they contact the brake disc from both sides, the rotation of the wheel is slowed down by the frictional force between the brake linings or the like and the brake disc, and the railway vehicle is braked. The brake mechanism 2 may be configured as any other type of brake, such as a drum brake.

[0015] Brake mechanism 2 is connected to the service brake unit 3 and the auxiliary brake unit 4, and further includes a power transmission mechanism 22 that transmits power from the service brake unit 3 to the shoe 21 when the service brake unit 3 is functioning, and transmits power from the auxiliary brake unit 4 to the shoe 21 when the service brake unit 3 is not functioning. Thus, the power transmission mechanism 22 that preferentially transmits power from the service brake unit 3 to the shoe 21 and transmits power from the auxiliary brake unit 4 to the shoe 21 only when the service brake unit 3 is not functioning can be configured by a combination of known mechanical elements such as a clutch and a torque diode (trademark). The power transmission mechanism 22 may also include a power boosting mechanism such as a toggle mechanism that amplifies the rotational power generated by the motors of the service brake unit 3 and the auxiliary brake unit 4, and a reduction mechanism that obtains torque according to the reduction ratio of the rotational power. Furthermore, the power transmission mechanism 22 includes a rotation-to-linear conversion mechanism that converts the rotational power generated by the motors of the service brake unit 3 and the auxiliary brake unit 4 into linear power for driving the shoe 21 radially.

[0016] The service brake unit 3 comprises a vehicle power supply 31 as a service power source, a control circuit 32, and a motor 33 as a service motor. The vehicle power supply 31 may be provided outside the service brake unit 3 and / or the braking device 1. The vehicle power supply 31 may also supply power supplied to the railway vehicle from the pantograph to the control circuit 32. The vehicle power supply 31, which is installed in at least one railway vehicle, supplies AC or DC power supplied from overhead catenary lines (overhead lines) or power supply rails (third rails) to various equipment and devices of the railway vehicle, including the control circuit 32 and the motor 33. The control circuit 32 includes an inverter that generates multiphase AC power of a desired frequency and amplitude based on the power supplied from the vehicle power supply 31, and generates AC power such as three-phase AC to be applied to the motor 33 in response to a service brake command from the vehicle's driver's cab, which is the control unit 5. The motor 33 as a service motor is an AC motor and drives the shoe 21 based on the AC power generated by the control circuit 32 in response to a service brake command from the control unit 5.

[0017] The service brake command from the vehicle's driver's cab, acting as the control unit 5, is broadly divided into a service brake action command that drives the shoe 21 to the brake action position where it is pressed against the wheel, and a service brake release command that drives the shoe 21 to the brake release position where it is not pressed against the wheel. When the control circuit 32 receives a service brake action command from the control unit 5, it rotates the rotor of the motor 33 in a first direction (hereinafter also referred to as the action direction or forward rotation direction) to generate a first AC current (hereinafter also referred to as the action AC current or forward rotation AC current) that drives the shoe 21 to the brake action position. When the control circuit 32 receives a service brake release command from the control unit 5, it rotates the rotor of the motor 33 in a second direction opposite to the first direction (hereinafter also referred to as the release direction or reverse rotation direction) to generate a second AC current (hereinafter also referred to as the release AC current or reverse AC current) that drives the shoe 21 to the brake release position.

[0018] When the normal brake unit 3 functions properly, specifically when the vehicle power supply 31, the control circuit 32, and the motor 33 all function properly, the control of the brake operation and release, specifically, the drive between the brake operation position and the brake release position of the shoe 21, is performed by the normal brake unit 3. On the other hand, when the normal brake unit 3 does not function properly, specifically when at least one of the vehicle power supply 31, the control circuit 32, and the motor 33 does not function properly, the control of the brake operation and release, specifically, the drive between the brake operation position and the brake release position of the shoe 21, is performed by the emergency brake unit 4.

[0019] The emergency brake unit 4 includes an emergency brake drive device that drives the shoe 21 at the brake operation position to the brake release position in response to an emergency brake release command (shown as "release command" in FIG. 1) from the control unit 5 when the normal brake unit 3 cannot drive the shoe 21 at the brake operation position to the brake release position. Specifically, when the normal brake unit 3 does not function, the emergency brake unit 4 drives the shoe 21 between the brake operation position and the brake release position based on the DC power supplied from the battery 41 as an emergency power supply. The emergency brake unit 4 includes the battery 41, a relay circuit 42 as a power supply control unit, and a DC motor 43 as an emergency motor and a DC motor.

[0020] The battery 41 different from the vehicle power supply 31 supplies DC power. The relay circuit 42 supplies the DC power of the battery 41 to the DC motor 43 in response to an emergency brake command and an emergency brake release command as an emergency brake operation command from the control unit 5. The DC motor 43 drives the shoe 21 between the brake operation position and the brake release position based on the DC power supplied from the battery 41 via the relay circuit 42. Note that the DC motor 43 may be composed of an inverter that converts the DC power supplied from the relay circuit 42 into AC power and a motor similar to the normal motor (motor 33) that generates rotational power based on the AC power converted by the inverter.

[0021] Figure 2 schematically shows the details of the relay circuit 42. In the relay circuit 42, a first path 44 and a second path 45 for connecting the battery 41 and the DC motor 43 are provided in parallel. The first path 44 includes a high-potential line 441 to which the high-potential terminal 411 of the battery 41 is connected, and a low-potential line 442 to which the low-potential terminal 412 of the battery 41 is connected. The high-potential line 441 is connected to the first terminal 431 of the DC motor 43 via a preliminary brake action switch 461 to be described later, and the low-potential line 442 is connected to the second terminal 432 of the DC motor 43 via a preliminary brake action switch 462 to be described later.

[0022] The second path 45 for connecting the battery 41 and the DC motor 43 in parallel with the first path 44 is connected to the high-potential line 441 on the battery 41 side from a preliminary brake action switch 461, an auxiliary switch 463, and a preliminary brake release switch 471 to be described later, and is connected to the second terminal 432 of the DC motor [i]43[ / i] from the preliminary brake action switch 461, the auxiliary switch 463, and the preliminary brake release switch 471. The first parallel line 451, and a second parallel line 452 which is connected to the low-potential line 442 on the battery 41 side from a preliminary brake action switch 462, an auxiliary switch 464, and a preliminary brake release switch 472 to be described later, and is connected to the first terminal 431 of the DC motor 43 from the preliminary brake action switch 462, the auxiliary switch 464, and the preliminary brake release switch 472. Thus, the first parallel line 451 and the second parallel line 452 are connected to the high-potential line 441 and the low-potential line 442 in a staggered manner, respectively.

[0023] The first path 44 and the second path 45 conduct when all the switches provided in each path are closed, supplying DC power to the DC motor 43. As will be described later, the first path 44 and the second path 45 do not conduct simultaneously. Specifically, when the pre-brake operation switches 461 and 462 are closed, the first path 44 conducts, and the high-potential terminal 411 of the battery 41 is connected to the first terminal 431 of the DC motor 43 via the high-potential line 441, and the low-potential terminal 412 of the battery 41 is connected to the second terminal 432 of the DC motor 43 via the low-potential line 442. At this time, a DC current flows in the DC motor 43 in a first direction from the high-potential first terminal 431 to the low-potential second terminal 432, and the rotor of the DC motor 43 rotates in the first direction (or the direction of operation, forward rotation direction), driving the shoe 21 to the brake operation position.

[0024] Furthermore, when the auxiliary switches 463, 464 and the auxiliary brake release switches 471, 472 are closed, the second path 45 becomes conductive, and the high-potential terminal 411 of the battery 41 is connected to the second terminal 432 of the DC motor 43 via the first parallel line 451, and the low-potential terminal 412 of the battery 41 is connected to the first terminal 431 of the DC motor 43 via the second parallel line 452. At this time, a DC current flows in the DC motor 43 in a second direction (opposite to the first direction) from the high-potential second terminal 432 to the low-potential first terminal 431, and the rotor of the DC motor 43 rotates in the second direction (or release direction, reverse direction), driving the shoe 21 to the brake release position.

[0025] The auxiliary relay 46, controlled by an auxiliary brake command from the vehicle's driver's cab (which acts as the control unit 5), comprises an auxiliary brake switch 461 located on a high-potential line 441, an auxiliary brake switch 462 located on a low-potential line 442, an auxiliary switch 463 located on a first parallel line 451, and an auxiliary switch 464 located on a second parallel line 452. These four switches 461 to 464 are mechanically connected and biased upward in Figure 2 by springs or the like. When an auxiliary brake command is given from the vehicle's driver's cab, switches 461 to 464 are not pressed downward, so the upward biasing force closes the auxiliary brake switches 461 and 462 and opens the auxiliary switches 463 and 464. On the other hand, when no auxiliary brake command is given from the vehicle's driver's cab, switches 461 to 464 are pressed downward, so the auxiliary brake switches 461 and 462 open and the auxiliary switches 463 and 464 close. Thus, the pre-brake operation switches 461 and 462 and the auxiliary switches 463 and 464 open and close complementaryly to each other depending on whether or not a pre-brake command is issued.

[0026] Therefore, while the first path 44 is conducting, the auxiliary brake activation switches 461 and 462 are closed, while the auxiliary switches 463 and 464 are open, so the second path 45 does not conduct. Similarly, while the second path 45 is conducting, the auxiliary switches 463 and 464 are closed, while the auxiliary brake activation switches 461 and 462 are open, so the first path 44 does not conduct. Consequently, the first path 44 and the second path 45 do not conduct simultaneously, effectively preventing conflict between the activation of the auxiliary brake due to the conduction of the first path 44 and the release of the auxiliary brake due to the conduction of the second path 45.

[0027] The release relay 47, controlled by a pre-brake release command (indicated as "release command" in Figure 2) from the vehicle's driver's cab, which acts as the control unit 5, comprises a pre-brake release switch 471 provided in series with an auxiliary switch 463 on the first parallel line 451, and a pre-brake release switch 472 provided in series with an auxiliary switch 464 on the second parallel line 452. These two switches 471 and 472 are mechanically connected and biased upward in Figure 2 by a spring or the like. When a pre-brake release command is given from the vehicle's driver's cab, switches 471 and 472 are pressed downward and closed. On the other hand, when no pre-brake release command is given from the vehicle's driver's cab, switches 471 and 472 are not pressed downward, and therefore open due to an upward biasing force.

[0028] Figure 3 shows the combination of a reserve brake command and a reserve brake release command from the vehicle's driver's cab. In the case of "no pressure" when a reserve brake command is given from the vehicle's driver's cab, the reserve brake action switches 461 and 462 close, the first path 44 conducts, and the auxiliary switches 463 and 464 open, preventing conduction of the second path 45. Therefore, regardless of whether a reserve brake release command is given (pressurized or unpressurized), the DC motor 43 rotates forward, and the shoe 21 is driven to the brake action position. In other words, when a reserve brake command is given from the vehicle's driver's cab, the reserve brake is applied regardless of whether a reserve brake release command is given.

[0029] In the case of "pressure" where no reserve brake command is given from the vehicle's driver's cab, and in the case of "pressure" where a reserve brake release command is given from the vehicle's driver's cab, auxiliary switches 463, 464 and reserve brake release switches 471, 472 close, the second path 45 conducts, and reserve brake action switches 461, 462 open, preventing the first path 44 from conducting. As a result, the DC motor 43 reverses direction and drives the shoe 21 to the brake release position. Thus, the reserve brake release switches 471, 472 close in response to the reserve brake release command "pressure," and in the case of "pressure" where no reserve brake command is given to the reserve brake action switches 461, 462, a DC current in the second direction (or release direction, reverse direction) is supplied to the DC motor 43 to drive the shoe 21 to the brake release position.

[0030] In the case of "pressurized" operation, where no auxiliary brake command is given from the vehicle's driver's cab, and in the case of "unpressurized" operation, where no auxiliary brake release command is given from the vehicle's driver's cab, the auxiliary brake action switches 461 and 462 open, preventing the first path 44 from conducting, and the auxiliary brake release switches 471 and 472 open, preventing the second path 45 from conducting. As a result, the DC motor 43 is not supplied with DC power from the battery 41, resulting in a "motor-free" state. This combination of auxiliary brake command "pressurized" and auxiliary brake release command "unpressurized" is taken when the service brake unit 3 is functioning normally and there is no need to use the auxiliary brake unit 4. Thus, when the service brake unit 3 is functioning, the auxiliary brake action switches 461 and 462 open (pressurized) without an auxiliary brake command being given, and the auxiliary brake release switches 471 and 472 open (unpressurized) without an auxiliary brake release command being given.

[0031] According to the first embodiment described above, the brake, which conventionally had to be manually released in the event of a loss of normal power supply, can be easily released with a simple configuration such as a relay circuit 42 composed of switches and a DC motor 43. It is preferable to configure the normal brake unit 3 and the auxiliary brake unit 4 with different circuit boards and house them in different enclosures so that an abnormality occurring in the normal brake unit 3 does not spread to the auxiliary brake unit 4.

[0032] Figure 4 schematically shows the configuration of the braking device 1 according to the second embodiment. Components similar to those in the first embodiment, such as in Figure 1, are denoted by the same reference numerals, and redundant explanations are omitted. The braking device 1 comprises a brake mechanism 2, a service brake unit 3, and a brake release device 6 as a reserve brake unit.

[0033] The power transmission mechanism 22 of the brake mechanism 2 is connected to the service brake unit 3 and the brake release device 6. When the service brake unit 3 is functioning, it transmits power from the service brake unit 3 to the shoe 21. When the service brake unit 3 is not functioning, it transmits power from the brake release device 6 to the shoe 21.

[0034] When the service brake unit 3 is functioning normally, the operation and release of the brakes are controlled by the service brake unit 3. On the other hand, when the service brake unit 3 is not functioning normally, the release of the brakes, specifically the drive of the shoe 21 from the brake operation position to the brake release position, is controlled by the brake release device 6.

[0035] The brake release device 6 is a reserve brake unit that drives the shoe 21 from the brake operating position to the brake release position in response to a brake release command (indicated as "operation" in Figure 4) when the service brake unit 3 is unable to drive the shoe 21 from the brake operating position to the brake release position. Specifically, when the service brake unit 3 is not functioning, the brake release device 6 drives the shoe 21 from the brake operating position to the brake release position based on DC power supplied from the battery 41. The brake release device 6 comprises a battery 41, a switch 61 as a power supply control unit, and a DC motor 43.

[0036] Switch 61 supplies DC power from battery 41 to DC motor 43 in response to a brake release command based on operation by a crew member or other person in the vehicle's driver's cab or other location. Specifically, when a brake release command is given to switch 61, it closes and supplies DC power from battery 41 to DC motor 43, and when a brake release command is not given to switch 61, it opens and does not supply DC power from battery 41 to DC motor 43. Based on the DC current in a second direction (or release direction, reverse direction) supplied from battery 41 via switch 61, DC motor 43 drives shoe 21 from the brake application position to the brake release position.

[0037] According to the second embodiment described above, the brake, which previously had to be manually released in the event of a loss of normal power supply, can be easily released with a simple configuration such as a switch 61 and a DC motor 43. Furthermore, in order to prevent an abnormality occurring in the normal brake unit 3 from spreading to the brake release device 6, which acts as a backup brake unit, it is preferable to configure the normal brake unit 3 and the brake release device 6 with different circuit boards and house them in different enclosures.

[0038] In the second embodiment described above, the portion 10 enclosed by the dotted line constitutes an independent braking unit. That is, the braking unit 10 includes the power transmission mechanism 22 of the brake mechanism 2, the control circuit 32 and motor 33 of the service brake section 3, and the entire brake release device 6. By attaching the shoe 21 and the vehicle power supply 31 to this braking unit 10, the braking device 1 shown in Figure 4 can be constructed.

[0039] In the third embodiment shown in Figure 5, the braking unit 10 includes only the DC motor 43, not the entire brake release device 6. The battery 41 and the switch 61, which serves as the power supply control unit of the brake release device 6, are integrated as a power switch unit and are detachable from the braking unit 10 on which the DC motor 43, which serves as the backup motor, is provided. In this way, by making at least a part of the brake release device 6, which serves as the backup brake unit, detachable from the braking unit 10, the remaining part of the brake release device 6 (power switch unit) only needs to be attached to the braking unit 10 when it is necessary to use the brake release device 6, that is, when the service brake unit 3 is not functioning and it is necessary to release the brakes using the brake release device 6. By making the power switch unit a separate configuration from the braking unit 10, one power switch unit can be shared by multiple braking units 10. As shown in the fourth embodiment shown in Figure 6, the entire brake release device 6, which serves as the backup brake unit, may be detachable from the braking unit 10.

[0040] The present invention has been described above based on embodiments. The embodiments are illustrative, and it will be understood by those skilled in the art that various modifications are possible in combinations of their components and processing processes, and that such modifications also fall within the scope of the present invention.

[0041] The functional configurations of each device described in the embodiments can be realized using hardware resources, software resources, or through the collaboration of hardware and software resources. Hardware resources can include processors, ROMs, RAMs, and other LSIs. Software resources can include operating systems, applications, and other programs.

[0042] In the embodiments disclosed herein, those in which multiple functions are provided in a distributed manner may have some or all of the multiple functions integrated into a single unit, and conversely, those in which multiple functions are integrated may have some or all of the multiple functions provided in a distributed manner. Whether the functions are integrated or distributed, the configuration should be such that the objective of the invention can be achieved. [Explanation of Symbols]

[0043] 1 Brake device, 2 Brake mechanism, 3 Service brake section, 4 Reserve brake section, 5 Control unit, 6 Brake release device, 10 Brake unit, 21 Shoe, 22 Power transmission mechanism, 31 Vehicle power supply, 32 Control circuit, 33 Motor, 41 Battery, 42 Relay circuit, 43 DC motor, 44 First path, 45 Second path, 46 Reserve relay, 47 Release relay, 61 Switch, 411 High potential terminal, 412 Low potential terminal, 431 First terminal, 432 Second terminal, 441 High potential line, 442 Low potential line, 451 First parallel line, 452 Second parallel line, 461 Reserve brake action switch, 462 Reserve brake action switch, 463 Auxiliary switch, 464 Auxiliary switch, 471 Reserve brake release switch, 472 Reserve brake release switch.

Claims

1. A braking mechanism that brakes a railway vehicle by pressing a friction material against a braking member of the railway vehicle, Unlike the primary motor that drives the brake mechanism, there is a backup motor that drives the brake mechanism when the primary motor is unable to drive the brake mechanism, A backup power supply, different from the primary power supply that supplies power to the primary motor, which supplies power to the backup motor, A power supply control unit controls the supply of power from the backup power supply to the backup motor in response to a backup brake command, A braking system equipped with [a specific feature].

2. The aforementioned backup power supply is a DC power supply that provides DC power, The aforementioned backup motor is a DC motor that drives the braking mechanism based on the DC power, The power supply control unit is a relay circuit that switches the path between the DC power supply and the DC motor in response to the pre-brake command. The braking device according to claim 1.

3. The aforementioned relay circuit is A brake action switch is provided on a first path connecting the DC power supply and the DC motor, and closes in response to the pre-brake command to supply DC current in a first direction to the DC motor, thereby pressing the friction material against the member being braked. A brake release switch is provided on a second path connecting the DC power supply and the DC motor in parallel with the first path, and closes in response to a brake release command, and when the pre-brake command is not given to the brake action switch, it drives the friction material to the brake release position by supplying DC to the DC motor in a second direction opposite to the first direction, The braking device according to claim 2, comprising:

4. The braking device according to claim 3, wherein when the regular motor and the regular power supply are functioning, the brake action switch opens without the pre-brake command being issued, and the brake release switch opens without the brake release command being issued.

5. The braking device according to claim 3 or 4, wherein the relay circuit is provided in series with the brake release switch on the second path and includes an auxiliary switch that opens in response to the pre-brake command.

6. The first path comprises a high-potential line to which the high-potential terminal of the DC power supply is connected, and a low-potential line to which the low-potential terminal of the DC power supply is connected. The second path comprises a first parallel line connected to the high-potential line on the DC power supply side of the brake action switch and the brake release switch, and connected to the low-potential line on the DC motor side of the brake action switch and the brake release switch, and a second parallel line connected to the low-potential line on the DC power supply side of the brake action switch and the brake release switch, and connected to the high-potential line on the DC motor side of the brake action switch and the brake release switch. A braking device according to any one of claims 3 to 5.

7. The braking device according to any one of claims 1 to 6, wherein at least one of the backup electric motor, the backup power supply, and the power supply control unit is detachable from the braking device.

8. The braking device according to claim 7, wherein the backup power supply and the power supply control unit are detachable from the braking device on which the backup electric motor is provided.

9. The aforementioned electric motor drives the friction material based on AC power, The system includes an inverter that generates AC power to be applied to the regular motor based on the power supplied from the regular power source. A braking device according to any one of claims 1 to 8.

10. The braking device according to claim 9, wherein the inverter and the power supply control unit are configured by different circuit boards.

11. The braking device according to claim 9 or 10, wherein the inverter and the power supply control unit are housed in separate enclosures.

12. A backup power supply different from the normal power supply that supplies power to a normal electric motor that drives a friction material pressed against a braking member of a railway vehicle to brake the railway vehicle, When the primary motor is unable to drive the friction material, a backup motor, different from the primary motor, drives the friction material based on power supplied from the backup power supply, A power supply control unit controls the supply of power from the backup power supply to the backup motor in response to a backup brake command, A pre-brake control device equipped with a pre-brake control device.

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