WO2019042841A1

WO2019042841A1 - Electro-mechanical brake actuator with internal power electronics unit and energy store

Info

Publication number: WO2019042841A1
Application number: PCT/EP2018/072660
Authority: WO
Inventors: Christian Mosbach; Marc-Gregory Elstorpff; Claus Müller; Alexander Süßmann
Original assignee: Knorr-Bremse Systeme für Schienenfahrzeuge GmbH
Priority date: 2017-08-31
Filing date: 2018-08-22
Publication date: 2019-03-07
Also published as: EP3676141A1; CN111051166B; CN111051166A; DE102017215289A1

Abstract

The invention relates to a brake actuator (1) for a rail vehicle, comprising a housing (11); a pressing part (8) which is configured so as to be pressed onto a brake disc (9); means (5, 6) for moving the pressing part (8); a logic unit (2) in or on the housing (11), said logic unit being configured to control the means (5, 6) for moving the pressing part (8); a control connection (3) on the housing (11); a supply connection (4) on the housing (11) for supplying the brake actuator (1) with energy; and a power electronics unit (99) with an energy store, said power electronics unit being arranged in or on the housing (11) and being paired solely with the one brake actuator (1).

Description

DESCRIPTION

Electro-mec hanischer brake actuator with internal power electronics and

energy storage

The present invention relates to an electro-mechanical brake actuator according to the preamble of claim 1.

DE 10 2009 042 965 A1 discloses an electro-mechanical brake actuator according to the preamble of claim 1 comprising: a housing; a pressing member configured to be pressed against a brake disk; means for moving the pressing member configured to move the pressing member toward and away from the brake disk; a logic unit in the housing configured to control the means for moving the pressing member; a control port on the housing for connection to a superordinate controller of the

Rail vehicle located outside the housing; one

Supply port on the housing for powering the brake actuator; and a Anpresskrafterfassungseinheit in the housing for detecting an actual contact pressure of the Anpressteils on the brake disc. Such electro-mechanics (EM) is basically considered substitution technology for pneumatic and hydraulic braking systems.

Electro-mechanical brake actuators are supplied with energy (in this case with an electrical supply voltage) from an external energy store via the supply connection. The external energy storage supplies several actuators simultaneously. The inventors have found out that before the

Background functional safety and system availability is unfavorable. The failure of an external energy storage or the central supply line before a diversion to the actuators leads to failure of the active actuators

Braking effect ("dangerous error") and in passive systems to one

Forced operation ("safe state"), which, however, as a rule, the availability of the rail vehicle is no longer guaranteed. In addition, a line defect in a supply line to an actuator or at the supply terminal to failure of an actuator with the same disadvantages described above. Furthermore, the electrical power requirement of electro-mechanical actuators characteristic load peaks and on average low power consumption.

Main consumers usually form electromagnets and electric motors. The energy supply from the external energy storage in the actuators must be designed for the load peaks. This increases, for example, the cross sections in the electrical supply lines of the supply connection.

It is the object of the present invention to provide an electro-mechanical

To provide brake actuator for a rail vehicle, which can eliminate the disadvantages described above. This object is achieved by the electro-mechanical brake actuator for a rail vehicle with the features of claim 1. The present invention is further developed in the subclaims.

The brake actuator for a rail vehicle has a housing; a pressing member configured to be pressed against a brake disk; a means to

Moving the pressing member configured to press the pressing member to

To move the brake disc towards and away from it; a logic unit in or on the housing configured to control the means for moving the pressing member; a control port on the housing for connection to a parent control of the rail vehicle located outside the housing; and a supply terminal on the housing for supplying the

Brake actuator with energy. A power electronics with energy storage is arranged in or on the housing and associated with only one brake actuator.

Preferably, the logic unit is configured to control the power electronics so that power flows of consumers in the brake actuator are controlled as needed. The brake actuator can advantageously predefined operations or load profiles in case of failure of the external power supply

run independently. The energy storage of the power electronics allows advantageously to buffer power peaks by a part of the power requirement from the energy storage of the power electronics and another part can be fed from an external, higher-level power supply of the rail vehicle.

The energy store of the power electronics is preferably an accumulator or a capacitor. The power electronics can amplifier, inverter and / or

Have rectifier circuits, inter alia, with switching transistors that can provide desired supply voltages.

Preferably, the means for moving the Anpressteils a spindle drive or a linear drive with its own logic unit. More preferably, the spindle drive or linear drive with appropriate sensors is force or position-controlled. These

Linear actuators are classified as active elements, i. that they build up power in the energized state. Advantageously, the contact pressure can be varied thereby. Alternatively, the means for moving the pressing member may be a passive component. The passive means for moving the Anpressteil then a

Have spring storage, which presses the Anpressteil to the brake disc. The

Spring accumulator is actuated by an actuator such as an electro-mechanical force generator, a pneumatic cylinder or a hydraulic cylinder when releasing the brake so that the Anpressteil removed from the brake disc. The braking energy is taken from the spring accumulator and does not have to be actively built up, which is advantageous, for example, in the event of a power failure.

Preferably, the brake actuator has a Anpresskrafterfassungseinheit in the housing for detecting an actual contact pressure of the Anpressteils on the brake disc, whereby a control of the contact pressure or a Nachspeisung the brake actuator can be effected. Preferably, the power electronics have a supply input connected to the supply terminal and at least one supply output connected to the logic unit and / or the means for moving the pressing member. The power electronics are preferably controlled via a control line from the logic unit.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 shows a first embodiment of a brake actuator for a

Rail vehicle according to the present invention;

Fig. 2 shows a second embodiment of a brake actuator for a

Rail vehicle according to the present invention;

Fig. 3 shows a third embodiment of a brake actuator for a

Rail vehicle according to the present invention; and

Fig. 4 shows a fourth embodiment of a brake actuator for a

Rail vehicle according to the present invention.

Fig. 1 shows a first embodiment of a brake actuator for a

Rail vehicle according to the present invention. The brake actuator 1 for a rail vehicle has a housing 1 1; a pressing member 8 configured to be pressed to a brake disk 9; a means 5, 6 for moving the

Pressing piece 8 configured to move the pressing part 8 toward and away from the brake disk 9; a logic unit 2 in the housing 1 1, which is configured to control the belt 5, 6 for moving the pressing member 8; a control terminal 3 on the housing 1 1 for connection to a higher-level control of the rail vehicle, which is located outside of the housing; a supply terminal 4 on the housing 1 1 for supplying the brake actuator 1 with energy; and a Anpresskrafterfassungseinheit 10 in the housing 1 1 for detecting an actual contact pressure F of the Anpressteils 8 on the brake disc 9. In addition, the Brake actuator 1, a power electronics 99 with energy storage, which is arranged in the housing 1 1 and only the one brake actuator 1 is assigned. By the

Arrangement of the power electronics 99 and the logic unit 2 in the housing 1 1 are the same protected against external influences. Alternatively, the power electronics 99 and the logic unit 2 can be arranged completely outside the housing 11 but on the housing 11. It is also conceivable to arrange the power electronics 99 partly in and partly outside the housing 11. For example, the

Energy storage of the power electronics 99 outside of the housing 1 1 but be arranged on the housing 11, while the remaining part of the power electronics 99 is disposed in the housing 11. This is particularly advantageous if the

Energy storage is a replaceable battery or a removable battery that should be accessible from the outside of the housing 1 1. In Fig. 1 are

Supply lines shown as solid lines, and control lines are shown as dashed lines. The power electronics 99 has a

Supply input, which is connected to the supply terminal 4, and at least a first and a second supply output, wherein the first supply output is connected to the logic unit 2 and the second

Supply output to the means 5, 6 is connected to move the Anpressteils 8. In addition, the power electronics 99 is controlled by the logic unit 2 via a control line.

The brake actuator 1 can advantageously in case of failure of an external

Power supply previously defined operations or load profiles

run independently. In the event of failure of the external, higher-level power supply, an emergency supply is also guaranteed. The power electronics have amplifier, converter and / or rectifier circuits, inter alia, with switching transistors, which can provide desired supply voltages.

The energy storage of the power electronics 99 also advantageously allows to buffer power peaks by a part of the power requirement from the

Energy storage of power electronics 99 and another part of an external, higher-level power supply of the rail vehicle can be fed. This allows the cross sections in the electrical supply lines of the Supply connection 4 are reduced, which on the one hand costs the

Wiring and on the other hand, the size can be reduced.

The logic unit 2 is configured to control the power electronics 99 so that power flows of consumers in the brake actuator 1 are controlled as needed. As a result, for example, energy consumption can be optimized.

The energy storage of the power electronics 99 is an accumulator, but it can also be a capacitor such as a super-cap can be used.

The means 5, 6 for moving the Anpressteils 8 has an active linear drive 5 with its own logic unit (not shown) and a lever mechanism 6, which is shown only schematically. The linear drive 5 is force or position-controlled with corresponding sensors (not shown). Reference numeral 7 denotes a

Brake assembly consisting of the Anpressteil 8, the brake disc 9 and a Anpresshalter that holds the Anpressteil 8,

Alternatively, the means 5, 6 for moving the pressing part 8 may be a passively operated component, as mentioned in the introduction to the description.

Fig. 2 shows a second embodiment of a brake actuator for a

Rail vehicle according to the present invention. The second embodiment is similar to the first embodiment, and only its differences from the first embodiment will be described below. The power electronics 99 has only one supply output, which is connected to both the logic unit 2 and the means 5, 6 for moving the Anpressteils 8.

Fig. 3 shows a third embodiment of a brake actuator for a

Rail vehicle according to the present invention. The third embodiment is similar to the first embodiment, and only its differences from the first

Embodiment will be described below. The power electronics 99 has only one supply output, both with the logic unit 2 and the means 5, 6 is connected for moving the pressing part 8. The supply output is also connected directly to the supply input of the power electronics 99.

Fig. 4 shows a fourth embodiment of a brake actuator for a

Rail vehicle according to the present invention. The fourth embodiment is similar to the first embodiment, and only its differences from the first embodiment will be described below. The power electronics 99 has only one supply output, which is connected to the means 5, 6 for moving the Anpressteils 8. The supply input of the power electronics 99 is also connected directly to a supply input of the logic unit 2.

The above-described configurations of the inputs and outputs of

Power electronics 99 are not limiting and may be modified by those skilled in the art.

LIST OF REFERENCE NUMBERS

1 brake actuator

2 logic unit

3 control connection

4 supply connection

5 linear drive

6 lever mechanism

7 brake assembly

8 press part

9 brake disc

10 contact force detection unit

1 1 housing

99 Power electronics with energy storage

F actual contact force

Claims

1 . Brake actuator (1) for a rail vehicle, comprising:

a housing (11);

a pressing member (8) configured to be pressed against a brake disk (9);

a means (5, 6) for moving the pressing member (8) configured to move the pressing member (8) toward and away from the brake disc (9);

a logic unit (2) in or on the housing (11), which is configured to control the means (5, 6) for moving the pressing part (8);

a control port (3) on the housing (1 1) for connection to a superordinate control of the rail vehicle, which is located outside of the housing; and

a supply connection (4) on the housing (1 1) for supplying the

Brake actuator (1) with energy,

marked by

a power electronics (99) with energy storage, which is arranged in or on the housing (11) and is associated with only one brake actuator (1).

2. brake actuator (1) according to claim 1,

wherein the logic unit (2) is configured to control the power electronics (99) to control power flows of consumers in the brake actuator (1) as needed.

3. brake actuator (1) according to claim 1 or 2,

wherein the energy storage of the power electronics (99) is an accumulator or a capacitor.

4. brake actuator (1) according to one of the preceding claims,

wherein the means (5, 6) for moving the pressing part (8) is a spindle drive or a linear drive with its own logic unit.

5. brake actuator (1) according to claim 4,

wherein the spindle drive or linear drive with appropriate sensors is force or position-controlled. 6. brake actuator (1) according to one of claims 1 to 3,

wherein the means (5,

6) for moving the pressing member (8) comprises a spring accumulator configured to press the pressing member (8) against the brake disc (9) and having an actuator configured to release the pressing member (8) upon release of the brake from the brake disc (9) to remove.

7. brake actuator (1) according to one of the preceding claims,

further comprising a Anpresskrafterfassungseinheit (10) in the housing (11) for detecting an actual contact pressure (F) of the pressing part (8) on the brake disc (9).

8. brake actuator (1) according to one of the preceding claims,

wherein the power electronics (99) have a supply input connected to the

Supply terminal (4) is connected, and at least one supply output, with the logic unit (2) and / or the means (5, 6) for moving the

Anpressteils (8) is connected, and wherein the power electronics via a

Control line is controlled by the logic unit (2).

9. brake actuator (1) according to claim 8,

wherein the supply input and the supply output are directly connected.