Compact brake caliper having electromechanical actuator, eccentric shaft drive and mechanical actuator, and method for operating such compact brake caliper

Abstract

The invention relates to a compact brake caliper (1), in particular for a disc brake of a rail vehicle, comprising two caliper levers (2, 3), two brake pads (4, 5), an adjusting module (6), an electromechanical brake force generator and an eccentric shaft drive (8). The invention relates to an electromechanical brake force generator (1), which interacts with an eccentric shaft drive (8) as an actuator module (7) and is designed with an actuator module housing (9a), in which an electric motor (10), a hollow shaft (11), a spindle drive (12) having a spindle nut (13) and a spindle (14), a motor brake (15) and a control unit (16) are arranged. A method for operating such a compact brake caliper (1) is also provided.

Description

Technical Field

[0001] The invention relates to a compact brake caliper having an electromechanical actuator according to the preamble of claim 1. The invention also relates to a method for operating such a compact brake caliper. Background Art

[0002] Compact brake calipers are widely used in the braking systems of rail vehicles. Compact brake calipers mainly consist of a force generator for providing the operating force or spring force storage, a transmission module for increasing the clamping force and an adjustment module for compensating for wear. Other components of the brake caliper include a bracket that allows the brake unit to be fixed in the bogie, a brake caliper rod that transmits the clamping force to the brake disc and a brake lining retainer with lining.

[0003] There are various methods for generating braking force in rail vehicles. Long-distance or short-distance trains are often equipped with pneumatic systems.

[0004] Hydraulic brake systems are commonly used in trams.

[0005] An alternative is an electromechanical brake force generator. Compared to pneumatic systems, no compressed air is required here, so all compressed air lines and valves, tanks and compressors can be omitted. Another advantage is that the reaction time when applying and releasing the brakes over the entire length of the train is significantly shortened.

[0006] Most electromechanical brake force generators are designed in the form of brake cylinders, which are connected to the brake pads directly or by means of brake rods. The electric motor works with a reduction gear and a lead screw that converts the rotary motion into a linear motion. The wear of the brake pads and brake discs is compensated by changing the relative position of the lead screw and the lead screw nut in the adjustment module.

[0007] Document DE 199 45 702 A1 describes an electromechanical compact brake caliper for rail vehicles. In this case, most of the braking force is generated by one or two compression springs. A drive motor acting via a transmission tensions these springs when the brake is released or supplements the spring force in the braking position. The wear adjuster is also designed as an electromechanical device and requires corresponding control. Summary of the invention

[0008] The object of the present invention is to provide an improved compact brake caliper having a low-cost electromechanical actuator which maintains the installation space of the compact brake caliper and has a low failure rate.

[0009] A further object is to provide an improved method for operating such a compact brake caliper.

[0010] This object is achieved by the technical solution of claim 1 .

[0011] The further object is achieved by a method according to claim 15 .

[0012] The idea of ​​the invention is to integrate an electromechanical actuator in a compact brake caliper having an eccentric shaft drive.

[0013] The compact brake caliper according to the invention, in particular for a disc brake of a rail vehicle, comprises two caliper levers, two brake pads, an adjustment module, an electromechanical brake force generator and an eccentric shaft drive. The electromechanical brake force generator cooperates with the eccentric shaft drive as an actuator module and is designed with a housing in which an electric motor, a hollow shaft, a spindle drive with a spindle nut and a spindle, a motor brake and a control unit are arranged.

[0014] A particular advantage here is that the actuator has a direct drive, ie the motor torque acts on the spindle drive and is converted by the spindle drive into an axial force.

[0015] It is also particularly advantageous that the axial force acts on the eccentric shaft drive of the eccentric shaft and thus generates the application force of the brake. Advantageously, no additional transmission or mechanical energy storage, such as a compression spring, is required in this way.

[0016] The use in compact brake calipers enables the additional advantageous use of eccentric shaft transmissions. As a result, the size of the electromechanical actuator can be significantly smaller, which has a positive effect on the installation space and the overall costs.

[0017] The method according to the invention for operating a compact brake caliper, in particular for a disc brake of a rail vehicle, comprises the following method steps, the compact brake caliper comprising two caliper levers, two brake pads, an adjustment module, an actuator module and an eccentric shaft drive, the actuator module being constructed with a housing in which an electric motor, a hollow shaft, a spindle transmission with a spindle nut and a spindle, a motor brake and a control unit are arranged. (VS1) when the position of the electric motor corresponds to a predetermined value or value range of the release position of the compact brake caliper and the motor brake of the actuator module is in its second operating state (the second operating state means that the hollow shaft of the actuator module is not locked), the compact brake caliper is clamped for service braking or for parking braking by switching on the electric motor of the actuator module in a first rotational direction; (VS2) when the measured values ​​of the force sensor and / or the angle sensor reach or exceed the predetermined value corresponding to the clamping position of the compact brake caliper as the service brake position or as the parking brake position, the electric motor is switched off and the first operating state of the motor brake is simultaneously switched on, in which the hollow shaft is locked and the compact brake caliper is maintained in the clamping position in the service brake position or the parking brake position; and (VS3) S3) When the measured value of the force sensor and / or the angle sensor corresponds to a predetermined value or value range of the clamping position of the compact brake caliper in the service brake position or the parking brake position and the motor brake is in its first operating state (the first operating state indicates that the hollow shaft is locked), the compact brake caliper is released from the service brake position or from the parking brake position by switching on the second operating state of the motor brake (in which the locking of the hollow shaft is released) and switching on the electric motor in a second rotational direction opposite to the first rotational direction, and when the measured value of the force sensor and / or the angle sensor reaches or falls below a predetermined value corresponding to the release position of the compact brake caliper, the electric motor is simultaneously switched off and the first operating state of the motor brake is switched on, in which the hollow shaft is locked and the release position of the compact brake caliper is maintained.

[0018] The use of a control unit and a force sensor as well as an angle sensor has the advantage that the method for operating a compact brake caliper can be easily implemented.

[0019] Another advantage is that the reaction time when applying and releasing the brakes over the entire train length is significantly shortened.

[0020] Further advantageous embodiments are given in the dependent claims.

[0021] In one embodiment, the electric motor has an electrically commutated permanent magnet motor as a hollow shaft motor, which has a stator fixed in a housing and a rotatable rotor fixed on a hollow shaft. The advantage of such a motor is a high motor torque. In addition, a compact design can be advantageously achieved.

[0022] Another embodiment provides that the spindle drive having the spindle nut and the spindle is arranged in a recess in the hollow shaft, wherein the spindle nut is arranged in the hollow shaft in a rotationally fixed manner relative to the hollow shaft.

[0023] In another embodiment, the spindle drive with the spindle nut and the spindle is designed as a ball screw drive. These functional units are high-quality, low-cost, commercially available components.

[0024] Another embodiment provides that the eccentric shaft drive is connected to the eccentric shaft rod in a rotationally fixed manner, and the eccentric shaft rod is coupled to the actuator module via its free end in a cooperative manner. This is particularly advantageous because neither an additional transmission device nor an additional mechanical energy storage device, such as a compression spring, is required.

[0025] It is advantageous if a pressure piece is fixed in a rotationally fixed manner relative to the spindle and coupled to the eccentric shaft at the free end of the spindle that projects from the spindle nut toward the eccentric shaft, since this provides a simple coupling possibility.

[0026] It is also advantageous if the pressure element has a first transmission section, a second transmission section and a guide section, which define a U-shaped gap in the shape of a hook, which cooperates with the free end of the eccentric shaft via a rotatable bearing guide wheel arranged between the first transmission section, the second transmission section and the guide section and forms a coupling between the eccentric shaft and the actuator module. This advantageously allows a simple design.

[0027] In one embodiment, the pressure piece is arranged in a linear guide section of the motor cover of the housing so as to be axially displaceably guided by means of the guide section and is thereby secured against rotation about the spindle axis of the spindle, whereby the spindle is axially displaceable in the direction of the spindle axis and is simultaneously secured against rotation. This advantageously enables a simple structure.

[0028] Another embodiment provides that the motor brake is designed as a passive motor brake, which is fixed in the housing by means of a first section and connected to the hollow shaft in a form-fitting manner by means of a second section. A passive motor brake is advantageous because it does not release the connection between its sections when there is no current.

[0029] The motor brake may also be constructed as an active brake, which may be a technical solution of an independent application.

[0030] Advantageously, the motor brake can be switched from a first operating state, in which a first section fixed in the housing and a second section of the motor brake connected to the hollow shaft form a non-rotatable connection, for example a form-locking or friction-locking connection, and the hollow shaft is locked, to a second operating state and back, and in which the fixed connection between the first section of the motor brake fixed in the housing and the second section thereof connected to the hollow shaft is released, wherein the hollow shaft is rotatable, since in this way a spindle drive with a low-friction ball recirculating spindle / spindle nut can be used which is not self-locking.

[0031] In another embodiment, an angle sensor is coupled to the hollow shaft, detects the angular position of the hollow shaft and is connected to a control device of the control unit for transmitting measurement data of the detected angular position of the hollow shaft. This advantageously allows not only the position of the compact brake caliper lever to be detected, but also the electric motor to be controlled and regulated.

[0032] Another embodiment provides that the hollow shaft is supported via an axial bearing on a force sensor arranged in the housing, which is connected to a control device of the control unit for transmitting the detected measurement data. This is particularly advantageous because the current contact pressure can be detected thereby.

[0033] Advantageously, the actuator module comprising housing, electric motor, hollow shaft, spindle drive with spindle nut and spindle, motor brake and control unit is a completely preassembled structural unit, since in this way the actuator module can be quickly and easily installed and removed during installation and maintenance.

[0034] This is because all electromechanical components of the actuator are assembled in a pre-installable module. The electric motor, spindle drive, motor brake, electronics and all sensors are installed in a separate subassembly and subsequently inserted into the brake caliper housing.

[0035] Yet another embodiment provides that the adjustment module is a mechanical adjustment module and is driven by a push rod in cooperation with an eccentric shaft drive. This is advantageous because the use of a mechanical adjustment module is a technically very reliable and low-cost solution because it has been used for many years in compact pliers.

[0036] In one embodiment of the method, the measured values ​​of the force sensor and the angle sensor are continuously detected, monitored and used for continuous regulation. Thus, advantageous control and monitoring as well as continuous regulation can be achieved.

[0037] Furthermore, in one embodiment, the detected measured values ​​of the force sensor and the angle sensor can advantageously be stored as a curve or an end value or an instantaneous value for monitoring and / or recording the braking and release process of the compact brake caliper and for controlled wear management. This provides new possibilities for monitoring or controlled wear management of the brake unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] An embodiment of the present invention is described below with reference to the accompanying drawings. The present invention is not limited to this embodiment. In particular, the various features of the following embodiments can be used not only in this embodiment but also in other embodiments. The accompanying drawings are as follows:

[0039] Figure 1 A schematic partial cross-sectional view showing an embodiment of a compact brake caliper according to the present invention;

[0040] Figure 2 Show according to Figure 1 A schematic cross-sectional view of an actuator module of an embodiment of a compact brake caliper of the present invention;

[0041] Figure 3 Show according to Figure 1 A schematic bottom view of an embodiment of a compact brake caliper of the present invention;

[0042] Figure 4 Show according to Figure 1 A schematic side view of an embodiment of a compact brake caliper of the present invention; and

[0043] Figure 5 A schematic flow chart of an exemplary embodiment of the method according to the present invention is shown. DETAILED DESCRIPTION

[0044] Figure 1 A schematic partial sectional view of an exemplary embodiment of a compact brake caliper 1 according to the invention is shown.

[0045] Figure 2 Show according to Figure 1 Schematic cross-sectional view of an actuator module 7 of an exemplary embodiment of a compact brake caliper 1 according to the invention.

[0046] Figure 3 Show according to Figure 1 Schematic bottom view of an embodiment of the compact brake caliper of the present invention.

[0047] Figure 4 Show according to Figure 1 Schematic side view of an embodiment of the compact brake caliper of the present invention.

[0048] The coordinates x, y, z are used for orientation in the figures. The coordinate x extends in the longitudinal direction of the compact brake caliper 1 , the coordinate y extends transversely to the longitudinal direction, and the coordinate z forms the vertical direction. Other orientations of the compact brake caliper 1 are of course also possible.

[0049] The compact brake caliper 1 is designed here with an eccentric shaft drive 8 and forms a disk brake for a rail vehicle.

[0050] The compact brake caliper 1 comprises two double-armed caliper levers 2 , 3 , two brake pads 4 , 5 , an adjustment module 6 , an actuator module 7 and an eccentric shaft drive 8 .

[0051] The double-arm clamp rods 2 and 3 are respectively arranged in two horizontal planes (xy planes). Figure 3 The double-arm tongs levers 2, 2' are shown in a side view.

[0052] The double-arm tongs levers 2, 3 are pivotably mounted by means of respective hinges with respective hinge axes B1, B2, which extend in the z direction and divide each tongs lever 2, 3 into two tongs lever sections of equal or different lengths. The hinges B1, B2 are connected both in two horizontal planes and in the vertical direction by respective lever sections (not shown).

[0053] On one side of the caliper lever 2, 3, the brake linings 4, 5 are pivotably mounted on the free ends of the caliper levers 2, 3 via lining holders in a joint with joint axes A1, A2 extending in the z direction. The adjustment module 6 is pivotably articulated in a joint C with joint axes C1, C2 extending in the z direction at the other free ends of the caliper levers 2, 3. The brake linings 4, 5 are arranged on both sides of a brake disk (not shown here) which is designed as an axle brake disk or a wheel brake disk.

[0054] An eccentric shaft drive 8 having an eccentric shaft 20 is arranged in a joint axis B1. The eccentric shaft 20 is connected to an eccentric shaft rod 21 in a rotationally fixed manner.

[0055] Document DE 195 14 463 C1 describes the structure and function of a conventional compact brake caliper 1 and a common eccentric shaft drive in detail, and is incorporated herein by reference.

[0056] The eccentric shaft 21 is here coupled via its free end to the actuator module 7 in an interactive manner. This will be described in more detail below.

[0057] The regulating module 6 ensures that the brake clearance (also called air gap) remains constant during the running time when the brake is released.

[0058] After each braking process, the adjustment module 6 compensates for newly occurring wear of the brake pads 4, 5 and the brake disk. The adjustment module 6 is controlled purely mechanically by a drive on the eccentric shaft 20 and by means of a push rod 6a (see Figure 1 and Figure 4 ).

[0059] The general operating principle of the control module 6 is described in EP 2 531 741 B1 or DE 44 31 321 C2, to which reference is hereby made.

[0060] The actuator module 7 forms an electromechanical force generator and is installed in the compact brake caliper 1 in a housing 9 in the region between the adjustment module 6 , ie the articulation axes C1 , C2 and the articulation axes B1 , B2. The housing 9 allows the compact brake caliper 1 to be fastened, for example, to a bogie of a rail vehicle.

[0061] The actuator module 7 as an electromechanical force generator can be completely preassembled and comprises all electrical components in addition to the mechanical components.

[0062] The actuator module 7 comprises an actuator module housing 9a, an electric motor 10, a hollow shaft 11, a spindle drive 12 having a spindle nut 13 and a spindle 14, a motor brake 15 and a control unit 16. The electric motor 10 has an electrically commutated permanent magnet motor (hollow shaft motor) which is characterized by a particularly high motor torque. The electric motor 10 comprises a stator 10a fixed in the actuator module housing 9a and a rotatable rotor 10b.

[0063] The rotor 10 b is fixedly mounted on a flange 11 e of the hollow shaft 11 and is arranged rotatably together with the hollow shaft 11 about a spindle axis 14 a extending in the y direction.

[0064] The hollow shaft 11 includes a first shaft end 11 a , a first bearing section 11 b , a second bearing section 11 c , a second shaft end 11 d , a flange 11 e , a first recess 11 f , and a second recess 11 g .

[0065] The flange 11e of the hollow shaft 11 is circumferentially arranged on the first bearing section 11b of the hollow shaft 11. The free end of the first bearing section 11b faces the eccentric shaft 21 and forms the first axial end 11a of the hollow shaft 11.

[0066] The first bearing section 11 b of the hollow shaft 11 is connected at its other end to the second bearing section 11 c of the hollow shaft 11 .

[0067] The free end of the second bearing section 11 c forms a second axial end 11 d in the form of a wall.

[0068] A first recess 11f is formed in the first bearing section 11b of the hollow shaft 11. The first recess 11f extends through an opening of the first shaft end 11a.

[0069] The spindle nut 13 is arranged in the first recess 11 f of the hollow shaft 11 so as to be non-rotatable relative to the hollow shaft 11 and rotates together with the hollow shaft 11 about the spindle axis 14 a .

[0070] The second bearing section 11c is connected to the first bearing section 11b of the hollow shaft 11, and an extension of the first recess 11f is formed in the second bearing section as a second recess 11g. Here, the inner diameter of the second recess 11g is smaller than the inner diameter of the first recess 11f. The second recess 11g is closed by the wall of the second shaft end 11d at the other end of the hollow shaft 11.

[0071] The spindle nut 13 has an internal thread which meshes with an external thread of the spindle 14. The spindle nut 13 and the spindle 14 form a spindle drive 12 and are designed here as a ball screw drive.

[0072] The spindle 14 extends through the hollow shaft 11 in the y direction, through the spindle nut 13 arranged in the first recess 11f, and further into the second recess 11f of the hollow shaft 11 until it reaches the wall of the second shaft end 11d. The inner diameter of the second recess 11g corresponds to the outer diameter of the spindle 14.

[0073] A pressure piece 17 is fixed to the free end of the spindle 14 which projects out of the spindle nut 13 in the first recess 11 f toward the eccentric shaft 21 .

[0074] The pressing piece 17 is constructed in a hook shape and has a first transmission section 17a, a second transmission section 17b and a guide section 17c. The first transmission section 17a is integrally formed on the end of the guide section 17c facing the free end of the screw 14. The second transmission section 17b is arranged on the other free end of the transmission section 17c. In addition, the first transmission section 17a forms a fixing portion of the pressing piece 17 on the free end of the screw 14. The transmission sections 17a, 17b and the guide section 17c define a U-shaped gap in the shape of a hook, which is also called a gripping portion (Umgriff).

[0075] On one side of the push piece 17, the push piece is arranged in a linear guide section 18 of the motor cover 9b of the housing 9 so as to be axially displaceable and guided by means of a guide section 17c and is secured against rotation about the spindle axis 14a. In this way, the spindle 14 can be axially displaced in the direction of its spindle axis 14a extending in the y direction and at the same time secured against rotation.

[0076] The first axial end 11 a of the hollow shaft 11 extends through the opening of the motor cover 9 b toward the eccentric shaft 21 .

[0077] The free end of the eccentric shaft 21 has a rotatable bearing guide wheel 19 which is received in a U-shaped gap of the pressure piece 17 between the transmission sections 17 a , 17 b of the pressure piece 17 and forms a coupling between the eccentric shaft 21 and the actuator module 7 .

[0078] In this way, the spindle 14 of the ball screw drive (spindle drive 12 ) cooperates with the bearing guide wheel 19 located in the eccentric shaft 21 and can transmit compressive and tensile forces to the bearing guide wheel 19 and thus to the eccentric shaft 21 .

[0079] The rotational motion of the rotor 10b generated by the electric motor 10 is transmitted from the hollow shaft 11 to the spindle nut 13. The spindle drive 12, which is composed of the rotatable spindle nut 13 and the spindle 14 which is fixed in rotation relative to each other, converts the rotational motion of the spindle nut 13 into the axial linear motion of the spindle 14.

[0080] In this way, the axial forces generated in the threaded spindle 14 are supported via the hollow shaft 11 and the axial bearing 25 arranged on the first bearing section 11 b in the region of the flange 11 e of the hollow shaft 11 on the force sensor 22 arranged in the actuator module housing 9 a .

[0081] The force sensor 22 is connected to the control device 16a of the control unit 16 for transmitting measured values ​​or measurement data of the detected supporting force. The connection is designed to be electrically conductive.

[0082] The control unit 16 is designed as a module having control, monitoring and power electronics.

[0083] The control device 16 a includes one or more control, monitoring and power electronics units.

[0084] The axial movement of the threaded spindle 14 thus drives the eccentric shaft 21 of the eccentric shaft drive 8 in order to apply or release the compact brake caliper 1 .

[0085] When the brake is applied, i.e. when the compact brake caliper 1 is compressed, the pressure piece 17 is pressed by means of the first transmission section 17a onto the support roller 19 in the y direction and a braking force is built up. When the brake is released, the force transmitted by the first transmission section 17a of the pressure piece 17 to the support roller 19 decreases until it becomes zero. In the further course, the brake pads 4, 5 are moved away from the brake disk until a predetermined air gap is established, in that the support roller 19 is pulled apart in the negative y direction by means of the second transmission section 17b (grip) of the pressure piece 17.

[0086] The hollow shaft 11 is supported in the motor cover 9b by means of a first bearing 24 on a first bearing section 11b of the hollow shaft 11, here next to a flange 11e, so as to be rotatable about the screw axis 14a relative to the actuator module housing 9a, and is supported in the bearing cover 9c in the actuator module housing 9a by means of a second bearing 24a on a second bearing section 11c of the hollow shaft 11 in the region of a second shaft end 11d so as to be rotatable about the screw axis.

[0087] The motor cover 9 b closes the actuator module housing 9 a in the direction of the eccentric shaft 21 .

[0088] The bearing cover 9 c separates a first region of the actuator module housing 9 a , in which the hollow shaft 11 is arranged, from a second region of the housing 9 a , in which the control unit 16 is arranged.

[0089] A motor brake 15 is arranged in the region of the second bearing section 11 c of the hollow shaft 11 .

[0090] The motor brake is fixed by means of a first section in the actuator module housing 9 a , for example screwed securely, and is connected by means of a second section in a form-fitting manner to the hollow shaft 11 , here to the second bearing section 11 c of the hollow shaft 11 .

[0091] The motor brake 15 can be designed in different ways, for example as a switchable electrical, electromagnetic and / or electromechanical clutch. Of course, other designs are also possible.

[0092] The function of the motor brake 15 is to establish a non-rotatable connection, for example a form-locking or friction-locking connection, between a first section fixed in the actuator module housing 9a and a second section connected to the hollow shaft 11 in a first operating state of the motor brake 15, wherein the hollow shaft 11 is locked, and to release the fixed connection between the first section fixed in the actuator module housing 9a and the second section connected to the hollow shaft 11 in a second operating state of the motor brake 15, wherein the hollow shaft 11 can rotate around the screw axis 14a.

[0093] The motor brake 15 is designed here as a passive motor brake 15. In other words, in the non-activated state, for example as an electrically switchable clutch in the de-energized state, the motor brake 15 is in its first operating state, in which the hollow shaft 11 is locked. With activation, for example as an electrically switchable clutch in the energized state, the motor brake 15 is in its second operating state, in which the hollow shaft 11 is unlocked and can rotate.

[0094] In this way, the motor brake 15 is used to

[0095] - Maintaining the release position of the compact brake caliper 1,

[0096] - fixedly engaged brakes without external energy supply,

[0097] - Holds the parking brake without external energy supply.

[0098] The motor brake 15 may also be configured as an active brake, which may be a technical solution of an independent application.

[0099] The electronic control device 16a of the actuator module is located in the control unit 16 in the second area of ​​the actuator module housing 9a of the preinstallable actuator module 7. The electronic control device is used to evaluate the measurement data of the sensors and to control the actuators, namely the electric motor 10 and the motor brake 15, as well as other electrical and / or electronic functional units not shown here.

[0100] The rotor of the angle sensor 23 is mounted on the second shaft end 11d of the hollow shaft 11, i.e., on the end side of the second shaft end 11d, and is required for controlling the electric motor 10. The angle sensor 23 detects the angular position of the hollow shaft 11 and transmits the relevant measurement data to the control device 16a of the control unit 16, which is connected to the angle sensor 23 (here connected electrically conductively).

[0101] A power supply connection 26 for the necessary connection lines of the control unit 16 of the actuator module 7 is mounted on the control unit 16 on the actuator module housing 9a. Figure 3 , the power connection 26 is shown by way of example to be arranged in the region between the articulation axes C1, C2 on the underside of the compact brake caliper 1. Of course, other positions of the power connection 26 are also possible. It is also conceivable to provide a plurality of power connections 26.

[0102] Figure 5 A schematic flow chart of an exemplary embodiment of a method according to the invention for operating a compact brake caliper 1 according to the invention is shown.

[0103] In a first method step VS1 , the compact brake caliper 1 is applied for service braking or for parking braking. For this purpose, the position of the electric motor 10 of the actuator module 7 and the operating state of the motor brake 15 are first detected by means of the angle sensor 23 .

[0104] If the position of the electric motor 10 corresponds to a predetermined value or value range of the release position of the compact brake caliper 1 and the motor brake 15 is in its second operating state, which means that the hollow shaft 11 is unlocked, the electric motor 10 is switched on in a first rotational direction in which the compact brake caliper 1 is pressed.

[0105] Here, the measured values ​​of the force sensor 22 and the angle sensor 23 are detected.

[0106] As soon as the measured values ​​of the force sensor 22 and the angle sensor 23 respectively reach or exceed the predetermined values ​​corresponding to the clamping position of the compact brake caliper 1 as a service brake position or as a parking brake position, the electric motor 10 is simultaneously shut down in a second method step VS2 and the first operating state of the motor brake 15 is switched on, wherein the hollow shaft 11 is locked and the compact brake caliper 1 is maintained in the clamping position in the service brake position or the parking brake position.

[0107] In a third method step VS3 , the compact brake caliper 1 is released. For this purpose, the position of the electric motor 10 of the actuator module 7 and the operating state of the motor brake 15 are first detected by means of the angle sensor 23 .

[0108] If the measured values ​​of the force sensor 22 and the angle sensor 23 correspond to a predetermined value or value range of the applied position of the compact brake caliper 1 in the service brake position or the parking brake position and the motor brake 15 is in its first operating state (the first operating state indicates that the hollow shaft 11 is locked), the motor brake 15 is switched to its second operating state, in which the hollow shaft 11 is unlocked and the electric motor 10 is switched on in a second rotational direction opposite to the first rotational direction, releasing the compact brake caliper 1 in the second rotational direction.

[0109] In this case, the measured values ​​of the force sensor 22 and the angle sensor 23 are detected.

[0110] As soon as the measured values ​​of force sensor 22 and angle sensor 23 reach or fall below a predetermined value corresponding to the release position of compact brake caliper 1 , electric motor 10 is simultaneously switched off and the first operating state of motor brake 15 is switched on, in which hollow shaft 11 is locked and the release position of compact brake caliper 1 is maintained.

[0111] The measured values ​​of the force sensor 22 and the angle sensor 23 are continuously monitored and can be stored as curves or end values ​​or instantaneous values ​​for monitoring and / or recording braking and release processes and for controlled wear management.

[0112] The embodiment of the compact brake caliper described above is used as a wheel brake caliper. Of course, the compact brake caliper can also be used as an axle brake caliper.

[0113] The invention is not restricted to the embodiments described above but can be modified within the scope of the claims.

[0114] Reference numerals list

[0115] 1Compact brake caliper

[0116] 2, 2'; 3 clamp rod

[0117] 4, 5 Brake linings

[0118] 6 Adjustment module

[0119] 6a Putter

[0120] 7 Actuator module

[0121] 8 Eccentric shaft drive

[0122] 9 Housing

[0123] 9a Actuator module housing

[0124] 9b Motor cover

[0125] 9c Bearing cap

[0126] 10 Electric Motor

[0127] 10a Stator

[0128] 10b Rotor

[0129] 11 Hollow shaft

[0130] 11a Shaft end

[0131] 11b, 11c support section

[0132] 11d Shaft end

[0133] 11e Flange

[0134] 11f, 11g concave parts

[0135] 12 Screw drive

[0136] 13 Screw nut

[0137] 14 Lead screw

[0138] 14a Screw axis

[0139] 15 Motor brake

[0140] 16 Control Unit

[0141] 16a Control device

[0142] 17 Press piece

[0143] 17a, 17b transfer section

[0144] 17c Guide section

[0145] 18 Linear guides

[0146] 19 Support guide wheel

[0147] 20 Eccentric shaft

[0148] 21 Eccentric shaft

[0149] 22 Force Sensor

[0150] 23 Angle sensor

[0151] 24, 24a bearings

[0152] 25 Axial bearing

[0153] 26 Power connector

[0154] A1, A2; B1, B2; C1, C2 hinge axis

[0155] B'1 eccentric axis

[0156] VS1, VS2, VS3 method steps

[0157] x, y, z coordinates

Claims

1. A compact brake caliper (1) for a disc brake, in particular for a rail vehicle, comprising two caliper levers (2, 3), two brake pads (4, 5), an adjustment module (6), an electromechanical brake force generator and an eccentric shaft drive (8), characterized in that: The electromechanical braking force generator acts as an actuator module (7) in cooperation with an eccentric shaft drive (8) and is constructed with an actuator module housing (9a), in which an electric motor (10), a hollow shaft (11), a spindle transmission (12) having a spindle nut (13) and a spindle (14), a motor brake (15) and a control unit (16) are arranged.

2. The compact brake caliper (1) according to claim 1, characterized in that The electric motor (10) has an electrically commutated permanent magnet motor as a hollow shaft motor having a stator (10a) fixed in an actuator module housing (9a) and a rotatable rotor (10b) fixed on a hollow shaft (11).

3. The compact brake caliper (1) according to claim 1 or 2, characterized in that A spindle transmission (12) having a spindle nut (13) and a spindle (14) is arranged in recesses (11f, 11g) of a hollow shaft (11), wherein the spindle nut (13) is arranged in the hollow shaft (11) in a rotationally fixed manner relative to the hollow shaft (11).

4. The compact brake caliper (1) according to any one of the preceding claims, characterized in that The spindle drive (12) having a spindle nut (13) and a spindle (14) is designed as a ball screw drive.

5. Compact brake caliper (1) according to any one of the preceding claims, characterized in that The eccentric shaft drive (8) is connected to an eccentric shaft (21) in a rotationally fixed manner, and the eccentric shaft is coupled to the actuator module (7) via its free end in a cooperative manner.

6. The compact brake caliper (1) according to claim 5, characterized in that At the free end of the threaded spindle (14) that protrudes from the spindle nut (13) toward the eccentric shaft (21), a pressure piece (17) is fixed in a rotationally fixed manner relative to the threaded spindle (14) and is coupled to the eccentric shaft (21).

7. The compact brake caliper (1) according to claim 6, characterized in that The pressing piece (17) comprises a first transmission section (17a), a second transmission section (17b) and a guide section (17c), wherein the first transmission section, the second transmission section and the guide section define a U-shaped gap in the shape of a hook, and the gap cooperates with the free end of the eccentric shaft (21) through a rotatable supporting guide wheel (19) arranged between the first transmission section (17a) and the second transmission section (17b) and forms a coupling between the eccentric shaft (21) and the actuator module (7).

8. The compact brake caliper (1) according to claim 7, characterized in that The pressure piece (17) is arranged in a linear guide device (18) of the motor cover (9b) of the actuator module housing (9a) so as to be axially movably guided by means of a guide section (17c) and is thereby prevented from rotating about the spindle axis (14a) of the spindle (14), whereby the spindle (14) can be axially moved in the direction of the spindle axis (14a) and is simultaneously prevented from rotating.

9. Compact brake caliper (1) according to any one of the preceding claims, characterized in that The motor brake (15) is designed as a passive motor brake (15), which is fixed in an actuator module housing (9a) by means of a first section and is connected to the hollow shaft (11) in a form-fitting manner by means of a second section.

10. The compact brake caliper (1) according to claim 9, characterized in that The motor brake (15) can be switched from a first operating state to a second operating state and back, in which a first section fixed in the actuator module housing (9a) forms a non-rotatable connection with a second section of the motor brake connected to the hollow shaft (11), such as a form-locking or friction-locking connection, and the hollow shaft (11) is locked, and in which the fixed connection between the first section of the motor brake fixed in the actuator module housing (9a) and the second section of the motor brake connected to the hollow shaft (11) is released, wherein the hollow shaft is rotatable.

11. Compact brake caliper (1) according to any one of the preceding claims, characterized in that An angle sensor (23) is coupled to the hollow shaft (11), detects the angular position of the hollow shaft (11) and is connected to a control device (16a) of a control unit (16) for transmitting measurement data of the detected angular position of the hollow shaft (11).

12. Compact brake caliper (1) according to any one of the preceding claims, characterized in that The hollow shaft (11) is supported via an axial bearing (25) on a force sensor (22) arranged in an actuator module housing (9a), which is connected to a control device (16a) of a control unit (16) for transmitting detected measurement data.

13. Compact brake caliper (1) according to any one of the preceding claims, characterized in that The actuator module (7) comprising an actuator module housing (9a), an electric motor (10), a hollow shaft (11), a spindle drive (12) with a spindle nut (13) and a spindle (14), a motor brake (15) and a control unit (16) is a completely preassembled structural unit.

14. Compact brake caliper (1) according to any one of the preceding claims, characterized in that The adjusting module (6) is a mechanical adjusting module (6) and is driven via a push rod (6a) in cooperation with an eccentric shaft drive (8).

15. A method for operating a compact brake caliper (1), in particular for a disc brake of a rail vehicle, the compact brake caliper comprising two caliper levers (2, 3), two brake linings (4, 5), an adjustment module (6), an actuator module (7) and an eccentric shaft drive (8), the actuator module (7) being constructed with an actuator module housing (9a), in which an electric motor (10), a hollow shaft (11), a spindle drive (12) with a spindle nut (13) and a spindle (14), a motor brake (15) and a control unit (16) are arranged, characterized in that: The method comprises the following steps: (VS1) for driving braking or for parking braking, the compact brake caliper (1) is pressed by switching on the electric motor (10) of the actuator module (7) in a first rotational direction when the position of the electric motor (10) corresponds to a predetermined value or a value range of a release position of the compact brake caliper (1) and the motor brake (15) of the actuator module (7) is in its second operating state, which indicates that the hollow shaft (11) of the actuator module (7) is unlocked; (VS2) when the measured values ​​of the force sensor (22) and / or the angle sensor (23) respectively reach or exceed a predetermined value corresponding to the clamping position of the compact brake caliper (1) as a service brake position or as a parking brake position, the electric motor (10) is turned off and the motor brake (15) is simultaneously switched on to a first operating state, in which the hollow shaft (11) is locked and the compact brake caliper (1) is held in the clamping position in the service brake position or the parking brake position; (VS3) When the measured values ​​of the force sensor (22) and / or the angle sensor (23) correspond to a predetermined value or value range of the clamping position of the compact brake caliper (1) in the service brake position or in the parking brake position and the motor brake (15) is in its first operating state indicating that the hollow shaft (11) is locked, the compact brake caliper (1) is released from the service brake position or from the parking brake position by connecting the motor brake (15) to a second operating state in which the locking of the hollow shaft (11) is released and the electric motor (10) is connected in a second rotational direction opposite to the first rotational direction, and when the measured values ​​of the force sensor (22) and / or the angle sensor (23) reach or fall below a predetermined value corresponding to the release position of the compact brake caliper (1), the electric motor (10) is simultaneously turned off and the first operating state of the motor brake (15) is connected, in which the hollow shaft (11) is locked and the release position of the compact brake caliper (1) is maintained.

16. The method according to claim 15, characterized in that The measured values ​​of the force sensor (22) and the angle sensor (23) are continuously detected, monitored and used for continuous regulation.

17. The method according to claim 15 or 16, characterized in that The detected measured values ​​of the force sensor (22) and the angle sensor (23) are stored as curves or final values ​​or instantaneous values ​​for monitoring and / or recording braking and release processes of the compact brake caliper (1) and for controlled wear management.

18. The method according to any one of claims 15 to 17, characterized in that The compact brake caliper (1) is configured according to any one of claims 1 to 14.

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