Electromagnetically actuatable brake assembly having a shaft to be braked

Abstract

The invention relates to an electromagnetically actuatable brake assembly having a shaft to be braked, wherein a brake lining carrier (2) is connected to the shaft for conjoint rotation and the brake lining carrier (2) is arranged so as to be axially movable relative to the shaft, wherein an armature disk (8) is connected to the magnet body (5) for conjoint rotation and is arranged so as to be axially movable, in which magnet body an electrically energisable coil winding (4) is accommodated, wherein spring elements (3) supported on the magnet body (5) apply spring force to the armature disk (8), wherein a brake surface part (1) has a brake surface, wherein the brake lining carrier (2) is arranged axially between the brake surface part (1) and the brake lining carrier (2), wherein the armature disk (8) is arranged axially between the brake lining carrier (2) and the magnet body (5), wherein a brake lining is arranged axially on each of the two sides of the brake lining carrier (2), wherein at least a limiting part (6) is effectively connected to the armature disk (8) and / or a limiting part (6) axially limits the armature disk (8) as soon as the brake linings fall below an axial minimum width.

Description

[0001] Electromagnetically actuated brake assembly with one shaft to be braked

[0002] Description:

[0003] The invention relates to an electromagnetically actuated braking arrangement with a shaft to be braked.

[0004] It is generally known that in order to operate an electromagnetically actuated brake, a coil winding of the brake must be electrically energized.

[0005] A brake arrangement is known from DE 102014000 196 A1.

[0006] From DE 102006009 876 B3 an electromagnetically openable spring pressure brake with a fan device and a microswitch is known.

[0007] An electromagnetic brake is known from DE 699 505 A.

[0008] An electromagnetic brake is known from DE 102019 104 890 A1.

[0009] A quiescent current brake is known from DE 39 15561 C1.

[0010] An electromagnetic brake is known from DE 617 195 A.

[0011] The invention is therefore based on the objective of further developing an electromagnetically actuated brake arrangement with a shaft to be braked, whereby the safety for further components of the system comprising the brake arrangement is to be increased.

[0012] According to the invention, the problem is solved in the brake arrangement according to the features specified in claim 1.

[0013] Key features of the invention for the electromagnetically actuated brake arrangement with a shaft to be braked are that a brake pad carrier is rotationally fixed to the shaft, in particular by means of an annular driver mounted on the shaft, and the brake pad carrier is arranged to be axially movable relative to the shaft.

[0014] ISI \ EIDOPAT 25.08.2025 wherein an armature disk is rotationally fixed to the magnet body and is arranged to be axially movable, in which an electrically energizable coil winding is received, wherein spring elements supported on the magnet body act on the armature disk with spring force, wherein a brake surface part has a brake surface, wherein the brake pad carrier is arranged axially between the brake surface part and the brake pad carrier, wherein the armature disk is arranged axially between the brake pad carrier and the magnet body, wherein a brake pad is attached axially to both sides of the brake pad carrier, wherein at least one limiting part is in operative connection with the armature disk, in particular for axially limiting the armature disk, and / or that a limiting part limits the armature disk axially, in particular on one side.as soon as or where the brake pads fall below a minimum axial width and / or as soon as the axial width of the brake pads is less than a minimum axial width and / or as soon as the common axial width of the brake pads falls below or is less than a minimum axial width.

[0015] An advantage of this design is that the braking function is deactivated when a critical wear threshold is reached, thus protecting other parts of the system. The brake is preferably usable as a holding brake. Therefore, when the wear of the brake pads reaches the critical value, the holding function of the brake fails automatically, and no further braking torque is dissipated by the holding brake. In this way, in the event of damage, protection is achieved for other valuable components of the system, in particular the rotary drive of a wind turbine. In an advantageous embodiment, an electrically energizable coil winding is accommodated in a recess, in particular a cavity, of a magnetic body of the brake assembly. An advantage here is that the magnetic field generated by the coil winding is completely conductive through the magnetic body.

[0016] In an advantageous embodiment, the respective limiting element is detachably connected to the armature disk and projects through a recess, in particular through a recess in the magnet body that extends through the magnet body. The end region of the respective limiting element facing away from the armature disk has a maximum outer diameter that is larger than the smallest clear diameter of the recess in the magnet body. An advantage of this is that a simple and cost-effective mechanism for limiting the stroke of the armature disk can be achieved.

[0017] In a preferred embodiment, the limiting element is a screw. The advantage here is that the limiting element is simple and inexpensive to manufacture. An adjusting screw can be used.

[0018] In an advantageous embodiment, the recess is designed as a stepped bore, particularly a through bore, incorporated into the magnetic body. An advantage here is that the boundary can be defined by the positioning of the step within the stepped bore.

[0019] In an advantageous embodiment, the screw head rests against the step of the stepped bore when the coil winding is de-energized and the brake linings have reached or fallen below their minimum width. The advantage here is that when the axial minimum width of the brake linings is reached, the limiter becomes effective, thus ending the holding brake function.

[0020] In an advantageous embodiment, the respective limiting element is a part detachably connected to the brake surface element or a screw, in particular an adjusting screw, screwed into a threaded bore of the brake surface element, especially wherein the bore axis of the threaded bore is aligned parallel to the axial direction. The advantage here is that a cost-effective and simple means can be used. In particular, only one screw needs to be screwed into the brake surface element, and this screw then protrudes axially from the brake surface element.

[0021] In an advantageous embodiment, the respective limiting element is formed integrally with the brake surface section, in particular projecting axially from the brake surface section. The advantage here is that no additional effort is required for the limiting element; thus, only the limiting element needs to be considered as an additional area in the mold for the brake surface section. This allows the brake surface section to be manufactured as a single metallic casting, so that the limiting function is integrated from the outset.

[0022] In an advantageous embodiment, the respective limiting element is arranged on the side of the braking surface section facing the magnet body. An advantage of this is that the freedom of movement of the armature disk can be limited.

[0023] In an advantageous embodiment, the respective limiting element is arranged radially outside the brake pad carrier, in particular wherein the area covered by the anchor disc in the radial direction overlaps with the area covered by the respective limiting element in the radial direction. It is advantageous that the limiting element projects axially unimpeded from the anchor disc because the brake pad carrier remains radially spaced.

[0024] In an advantageous embodiment, all limiting elements are arranged at the same radial distance to the axis of rotation of the shaft. This is advantageous because it prevents the armature disk from tilting.

[0025] In an advantageous embodiment, the limiting elements are spaced apart from each other in the circumferential direction, in particular uniformly spaced. The advantage here is that with the greatest possible distance between the limiting elements in the circumferential direction, the anchor disk is prevented from tilting.

[0026] In an advantageous embodiment, the brake pad carrier is made of multiple parts. An advantage of this is that simple manufacturing is possible by riveting stamped metal sheets. Furthermore, the tendency to vibrate can be reduced. In an advantageous embodiment, the brake pads are bonded to the brake pad carrier, in particular by being glued to the brake pad carrier. An advantage of this is that a stable, durable, simple, and cost-effective joining technique can be implemented.

[0027] In an advantageous embodiment, the brake surface section is designed as a bearing shield, wherein a bearing for the rotatable support of the shaft is accommodated in the brake surface section, in particular wherein the shaft is a rotor shaft of an electric motor, especially of the system, and the brake surface section is a housing-forming part of the electric motor. It is advantageous that not only can a portion of the frictional heat be dissipated to the environment in the brake surface section, but the bearings of the rotor shaft of the electric motor can also be accommodated.

[0028] In an advantageous embodiment, the contact between the armature disk and at least one of the limiting parts acts as the closing of an electrical contact, which transmits a warning signal and / or an error message. The advantage here is that the armature disk is electrically insulated from the magnet body or at least from the braking surface part and is only electrically connected upon contact with the braking surface part, thus closing an electrical contact that can be transmitted as a warning or error signal. This results in increased safety.

[0029] Further advantages arise from the dependent claims. The invention is not limited to the combination of features of the claims. For those skilled in the art, further meaningful combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent, in particular from the problem statement and / or the problem arising from a comparison with the prior art.

[0030] The invention will now be explained in more detail with reference to schematic illustrations:

[0031] Figure 1 shows a cross-section through a first brake arrangement according to the invention.

[0032] Figure 2 shows a section of a second brake arrangement according to the invention. Figure 3 shows a cross-section through the second brake arrangement according to the invention.

[0033] Figure 4 shows a cross-section through a third brake arrangement according to the invention.

[0034] As shown in the figures, the first brake arrangement has a preferably ferromagnetic magnet body 5 which has an annular recess in which an electrically currentable coil winding is received.

[0035] The rotatably mounted shaft to be braked by the braking arrangement is preferably a rotor shaft of an electric motor to which the braking arrangement is attached. In the latter case, the braking arrangement is part of a brake motor thus formed.

[0036] The ring axis of the recess is coaxial to the winding axis of the coil winding and / or to the axis of rotation of the rotatably mounted shaft to be braked by the braking arrangement.

[0037] A ring-shaped driver is mounted on the shaft and preferably connected to the shaft in a rotationally fixed manner by means of a keyway connection. A ring-shaped brake pad carrier, particularly one consisting of multiple parts, has internal teeth which are mounted onto external teeth of the driver and connected in a rotationally fixed manner, the brake pad carrier being arranged to be axially displaceable relative to the driver.

[0038] A ferromagnetic armature disk, arranged axially between the brake pad carrier (which is provided with a brake pad on both sides) and the magnet body including the coil winding, is rotationally fixed to the magnet body 5 and axially movable. Preferably, bolts extending axially and protruding through recesses in the armature disk are screwed or inserted into the magnet body 5 for this purpose.

[0039] A brake surface part 1, in particular a bearing shield which accommodates a bearing for rotatable support of the shaft, or a friction disc which can be connected to a housing part of the electric motor, is arranged on the side of the brake pad carrier axially away from the armature disc 8.

[0040] The braking surface section 1 has a finely machined braking surface, which is designed to engage with a brake pad 9 attached to the brake pad carrier 2 to generate braking force. When the coil winding is energized, the armature disk is pulled towards the magnet body against the spring force generated by spring elements supported on the magnet body. When the coil winding is not energized, the spring elements push the armature disk away from the magnet body towards the brake pad carrier 2.

[0041] This causes the anchor disc 8 to press against a brake pad of the brake pad carrier 2, which is thus pressed towards the brake surface part 1, thereby pressing the brake pad 9 facing the brake surface part 1 onto the brake surface formed on the brake surface part 1.

[0042] The brake pads 9 each have a uniform axial width.

[0043] According to the invention, the axial working area which is released to the anchor disk 8 is defined by a limiting part 6.

[0044] In the embodiment shown in Figure 1, the limiting part 6 is designed as a screw which protrudes through an axially directed stepped bore of the magnet body 5 and is screwed into a threaded bore of the armature disk 8 with its threaded area.

[0045] The step of the stepped bore limits the axial movement of the screw head, especially if the screw has a larger outer diameter than the clear inner diameter at the step.

[0046] If the brake pads 9 have exceeded a critical level of wear and thus have a correspondingly small axial width, the armature disc 8 is pressed towards the brake pad carrier 2 by the spring elements 3 until the screw, in particular the screw head, limits the movement of the armature disc. Thus, even when the brake is engaged, i.e., when the coil winding is de-energized, no braking force is generated; instead, the armature disc 8 is merely held at the maximum permissible distance to the magnet body 5, while the screw head rests directly against the step of the stepped bore. The limiting element 6 can be designed differently in other embodiments.It is important that the limiting part 6 is connected to the armature disk 8 and protrudes through a continuous recess in the magnet body 5, wherein the limiting part 6 has a region on its end area facing away from the armature disk 8 whose outer radius or largest outer diameter is larger than the smallest clear width of the recess.

[0047] The limiting part 6 can also be connected to the anchor disc 8 by means of a material bond and / or a force bond.

[0048] Although only a single limiting part 6 is shown in Figure 1, further limiting parts 6 of identical design are provided, which differ only in the circumferential angle position with respect to the axis of rotation of the shaft.

[0049] As shown in Figure 1, the brake pad carrier 2 can be made of two or more parts by riveting several sheets together. The brake pads 9 are bonded to the brake pad carrier 2 by a material bond.

[0050] As shown in Figures 2 and 3, in contrast to the embodiment shown in Figure 1, the limiting element 6 is not located on the magnet body 5, but on the braking surface part 1. For this purpose, the braking surface part 1 has an axially projecting stop element 20, specifically a projection extending towards the armature disk 8 and / or towards the magnet body 5. This projection and further identical or similar projections spaced apart from one another in the circumferential direction are integrally formed with the braking surface part 1. Preferably, all the projections are arranged on the same, and in particular identical, radius.

[0051] If, in particular due to wear, the brake pads 9 fall below a minimum axial width, the anchor disc 8 is pressed onto the projections by the spring elements 3 in the non-energized operating case and the braking force is thus lost.

[0052] The projections thus act as a one-sided axial limit for the anchor disc 8. It is important that the projections are radially spaced from the brake pad carrier 2 and the brake pads 9. The projections are therefore located radially outside the brake pad carrier 2 and the brake pads 9.

[0053] The area covered in the axial direction by the brake pad carrier 2 together with the brake pads 9 overlaps with the area covered in the axial direction by the projections.

[0054] The radial direction, like the circumferential direction, refers to the axis of rotation of the shaft, which is aligned parallel to the axial direction.

[0055] As shown in Figure 4, instead of the projections formed integrally on the brake surface part 1, separately formed stop elements 20 can also be used, each of which can be designed as a screw or even as an adjusting screw, which are screwed into a respective axially directed threaded bore of the brake surface part 1.

[0056] The stop elements 20 thus function as a one-sided axial limit for the anchor disk 8.

[0057] It is important that the stop elements 20 are radially spaced from the brake pad carrier 2 and the brake pads 9. The stop elements 20 are therefore located radially outside the brake pad carrier 2 and the brake pads 9.

[0058] The area covered in the axial direction by the brake pad carrier 2 together with the brake pads 9 overlaps with the area covered in the axial direction by the stop elements 20.

[0059] Preferably, an electrical contact is closed when the armature disk and one of the limiting parts 6 come into contact, so that a warning signal and / or fault signal can be transmitted, with which the system can be switched off.

[0060] In further embodiments of the invention, the stop elements are attached to the brake pad carrier 2 instead of to the stationary parts, such as the brake surface part 1 and the magnet body 5. List of reference numerals

[0061] 1 Brake surface component, in particular bearing shield or friction disc 2 Brake pad carrier, in particular two- or multi-part

[0062] 3 Spring element

[0063] 4 windings

[0064] 5 magnetic bodies

[0065] 6 Limiting part, in particular screw 7 Step bore

[0066] 8 Anchor disc

[0067] 9 brake pads

[0068] 20 Stop element, in particular adjusting screw or screw

Claims

Patent claims:

1. Electromagnetically actuated brake arrangement with a shaft to be braked, wherein a brake pad carrier is rotatably connected to the shaft, in particular by means of an annular driver mounted on the shaft, and the brake pad carrier is arranged to be axially movable relative to the shaft, wherein an armature disk is rotatably connected to a magnet body and is arranged to be axially movable, in which an electrically energizable coil winding is received, wherein spring elements supported on the magnet body act on the armature disk with spring force, wherein a brake surface part has a brake surface, wherein the brake pad carrier is arranged axially between the brake surface part and the armature disk, wherein the armature disk is arranged axially between the brake pad carrier and the magnet body, wherein a brake pad is attached axially on both sides of the brake pad carrier, characterized in thatthat at least one limiting element for axially limiting the anchor disc comes into operative contact with the anchor disc or is in operative contact with the anchor disc and / or that a limiting element limits the anchor disc axially, in particular on one side, as soon as or wherein the brake linings fall below a minimum axial width and / or as soon as the axial width of the brake linings is less than a minimum axial width and / or as soon as the common axial width of the brake linings falls below or is less than a minimum axial width.

2. Electromagnetically actuated brake arrangement with a shaft to be braked, wherein a brake pad carrier is rotatably connected to the shaft, in particular by means of an annular driver mounted on the shaft, and the brake pad carrier is arranged to be axially movable relative to the shaft, wherein an armature disk is rotatably connected to a magnet body and is arranged to be axially movable, in which an electrically energizable coil winding is received, wherein spring elements supported on the magnet body act on the armature disk with spring force, wherein a brake surface part has a brake surface, wherein the brake pad carrier is arranged axially between the brake surface part and the armature disk, wherein the armature disk is arranged axially between the brake pad carrier and the magnet body, wherein a brake pad is attached axially on both sides of the brake pad carrier.wherein at least one limiting part for axially limiting the armature disk comes into operative contact with or is in operative contact with the armature disk and / or that a limiting part limits the armature disk axially, in particular on one side, as soon as or wherein the brake linings fall below a minimum axial width and / or as soon as the axial width of the brake linings is less than a minimum axial width and / or as soon as the common axial width of the brake linings falls below or is less than a minimum axial width, wherein the recess is designed as a stepped bore, in particular a through bore, introduced into the magnet body, the screw head rests against the step of the stepped bore when the coil winding is de-energized and the brake linings have reached or fallen below the minimum width.

3. Brake arrangement according to claim 1 or 2, characterized in that an electrically energizable coil winding is received in a recess, in particular a recess, of a magnetic body of the brake arrangement.

4. Brake arrangement according to one of the preceding claims, characterized in that the respective limiting part is detachably connected to the armature disk and projects through a recess, in particular through a recess of the magnet body passing through the magnet body, wherein the end region of the respective limiting part facing away from the armature disk has a largest outer diameter which is larger than the smallest clear diameter of the recess of the magnet body.

5. Brake arrangement according to one of the preceding claims, characterized in that the respective limiting part is a screw.

6. Brake arrangement according to one of the preceding claims, characterized in that the recess is designed as a stepped bore, in particular a through bore, introduced into the magnet body.

7. Brake arrangement according to one of the preceding claims, characterized in that the screw head of the screw rests against the step of the step bore when the coil winding is de-energized and the minimum width of the brake linings has been reached or fallen below.

8. Brake arrangement according to claim 1, 2 or 3, characterized in that the respective limiting part is a part detachably connected to the brake surface part or is a screw, in particular an adjusting screw, screwed into a threaded bore of the brake surface part, in particular wherein the bore axis of the threaded bore is aligned parallel to the axial direction.

9. Brake arrangement according to claim 1, 2 or 3, characterized in that the respective limiting part is formed integrally with the brake surface part, in particular and protrudes axially from the brake surface part.

10. Brake arrangement according to claim 9 or 8, characterized in that the respective limiting part is arranged on the side of the brake surface part facing the magnet body and / or projects axially on the brake surface part and / or that the contact between the armature disk and at least one of the limiting parts acts as closing an electrical contact which transmits a warning signal and / or an error message.

11. Brake arrangement according to one of the preceding claims, characterized in that the respective limiting part is arranged radially outside the brake pad carrier, in particular wherein the area covered by the anchor disc in the radial direction overlaps with the area covered by the respective limiting part in the radial direction.

12. Brake arrangement according to one of the preceding claims, characterized in that the limiting parts are all arranged at the same radial distance to the axis of rotation of the shaft.

13. Brake arrangement according to one of the preceding claims, characterized in that the limiting parts are spaced apart from each other in the circumferential direction, in particular uniformly spaced.

14. Brake arrangement according to one of the preceding claims, characterized in that the brake pad carrier is made in multiple parts and / or that the brake pads are bonded to the brake pad carrier, in particular are glued to the brake pad carrier.

15. Brake arrangement according to one of the preceding claims, characterized in that the brake surface part is designed as a bearing shield, wherein a bearing for the rotatable support of the shaft is accommodated in the brake surface part, in particular wherein the shaft is a rotor shaft of an electric motor, in particular of the system and the brake surface part is a housing-forming part of the electric motor.

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