Brake assembly, in particular for an electric motor, for braking a shaft, and brake motor comprising an electric motor and a brake assembly

Abstract

The invention relates to a brake assembly, in particular for an electric motor, wherein the brake assembly comprises a brake and a housing part, wherein the brake is surrounded by the housing part in a housing-forming manner, wherein radially outwardly projecting ear regions which are spaced apart from one another in the peripheral direction are formed on a braking surface part of the brake.

Description

[0001] Brake arrangement, in particular for an electric motor, for braking a shaft and brake motor with electric motor and brake arrangement

[0002] Description:

[0003] The invention relates to a brake arrangement, in particular for an electric motor, for braking a shaft and a brake motor with electric motor and brake arrangement.

[0004] It is generally known to provide a brake arrangement for braking a shaft, in particular the rotor shaft of an electric motor of a brake motor.

[0005] The invention is therefore based on the object of developing a safe and simple manufacturing method for a compact brake arrangement.

[0006] According to the invention, the object is achieved in the brake arrangement according to the features specified in claim 1.

[0007] Important features of the invention in the brake arrangement are that the brake arrangement, in particular for an electric motor, is provided for braking a shaft, wherein the brake arrangement has a brake and a housing part, wherein the brake has a lining carrier, in particular a brake lining carrier, which is connected to the shaft in a rotationally fixed manner and is movable in the axial direction, wherein an annular plate is fastened to an annular braking surface part of the brake, wherein electrical connection lines of the brake are spaced apart, in particular at least also, from the lining carrier, in particular axially, by means of the annular plate, wherein the annular plate is arranged radially within the braking surface part and / or wherein the annular plate is radially surrounded by the braking surface part, in particular wherein the brake can be actuated by means of a coil which can be electrically energized via the electrical connection lines.

[0008] The advantage here is that the ear areas on the braking surface protrude radially and are spaced apart from each other circumferentially. Thus, the brake's reaction torque and frictional heat are dissipated to the housing via the ear areas.

[0009] There is therefore an annular gap between the brake and the housing part, which is interrupted several times, namely by the ear areas.

[0010] In an advantageous embodiment, the annular plate has a radially outwardly raised, in particular protruding, securing area, which is arranged axially between the connecting lines and the lining carrier and / or spaced the connecting lines from the lining carrier. Advantageously, the securing area can be designed with a less pronounced curvature than the rest of the annular plate. This allows for a high level of safety, since a wide circumferential angle range can be protected in the circumferential direction.

[0011] In an advantageous embodiment, the annular plate has two tab regions spaced apart from one another in the circumferential direction, which protrude radially from the annular plate. In particular, screws screwed into threaded holes in the braking surface part pass through the tab regions, and the screw heads of the screws press the tab regions against projections projecting radially inward on the braking surface part, in particular, the tab regions being spaced apart from one another. This is advantageous in that a stable fastening of the annular plate can be achieved.

[0012] In an advantageous embodiment, the ends of the connecting cables are provided with first, particularly insulated, wire end ferrules, the ends of the supply cables are provided with second, particularly insulated, wire end ferrules, and the first wire end ferrules are connected to the second wire end ferrules, particularly by plugging them together. This is advantageous because it enables simple manufacturing. First, the supply cables are guided through the cable gland, and then the brake is inserted into the housing part. This then allows the axially projecting ends of the connecting cables to be connected to the ends of the supply cables.

[0013] In an advantageous embodiment, the area circumferentially covered by the securing area encompasses the area circumferentially covered by the two wire end ferrules. This is advantageous because the wire end ferrules are prevented from penetrating the stroke area, i.e., the working area, of the brake lining carrier.

[0014] In an advantageous embodiment, the radial distance area covered by the securing area encompasses the radial distance area covered by the two wire end ferrules in the circumferential direction. Advantageously, the securing area is arranged at the same radial distance as the wire end ferrules, so that the wire end ferrules cannot penetrate the working area of ​​the brake lining carrier.

[0015] In an advantageous embodiment, the ring axis of the ring plate is aligned coaxially with the shaft's rotational axis. This is advantageous because the shaft passes axially through the ring plate, allowing the brake to be attached and connected to the shaft from the axial direction. In particular, the brake pad carrier can be connected to the shaft in a rotationally fixed manner.

[0016] In an advantageous embodiment, the ring plate is flat. This allows for simple production as a stamped part.

[0017] In an advantageous embodiment, the brake and / or the braking surface part is / are enclosed by the housing part to form a housing. This is advantageous because it makes an explosion-proof design easy to implement.

[0018] In an advantageous embodiment, ear regions which project radially outwards and are spaced apart from one another in the circumferential direction are formed on the braking surface part of the brake, wherein the ear regions are connected to the housing part, in particular wherein the ear regions are each screwed to the housing part with a respective screw, in particular wherein the respective screw is screwed into an axially directed threaded bore of the housing part, in particular wherein the radial direction is related to the axis of rotation of the shaft and / or the axial direction and the circumferential direction are related to the axis of rotation of the shaft. The advantage here is that in the event of a power failure, the brake is applied automatically and the coil only needs to be energized to release the brake.

[0019] In an advantageous embodiment, the radially inwardly projecting projections are circumferentially spaced from the radially outwardly projecting ear regions. This advantageously ensures that the fastening screws, which extend through the tab regions and are screwed into threaded holes in the braking surface part, do not collide with the securing region.

[0020] In an advantageous embodiment, the braking surface part is connected to a magnetic body of the brake, wherein an electrically energizable coil is accommodated in an annular recess of the magnetic body, wherein spring elements supported on the magnetic body press on a ferromagnetic armature disk arranged axially between the lining carrier and the magnetic body, wherein the lining carrier is arranged axially between the armature disk and a braking surface formed on the braking surface part, wherein the armature disk is arranged in a rotationally fixed manner to the magnetic body and is axially displaceable, in particular in that bolts fastened to the magnetic body pass through the armature disk in the axial direction, in particular wherein when the coil is energized, the armature disk rotates counter to the direction determined by the

[0021] spring force generated by spring elements is moved towards the magnetic body and at

[0022] When the coil is de-energized, the spring elements press the armature plate onto the brake lining carrier, so that the lining carrier, on its side facing away from the armature plate, is pressed onto the braking surface of the brake surface part. The advantage of this is that the brake automatically engages in the event of a power failure. This increases safety.

[0023] In an advantageous embodiment, the radial clearance area covered by the brake and / or the ear portions is encompassed by or overlaps the radial clearance area covered by the housing part. Advantageously, the ear portions can be connected to the housing part by axially directed screws.

[0024] In an advantageous embodiment, the brake has an electrically energizable coil, with connecting cables extending radially out of the brake and protruding axially into the annular gap located between the brake and the housing. This is advantageous because, during manufacturing, the brake can be inserted axially into the housing, and only then are the supply lines, which extend radially through the housing, connected to the brake's connecting cables.

[0025] In an advantageous embodiment, the connecting cables are provided with first wire end ferrules at their ends protruding into the annular gap, which are plug-connected to second wire end ferrules. This is advantageous because the supply cables can be routed through the housing part before the brake is inserted, and the connecting cables are only connected to the supply lines afterward.

[0026] In an advantageous embodiment, the second wire end ferrules are arranged at the respective ends of the respective supply lines. This is advantageous because the first wire end ferrules can be easily connected to the second wire end ferrules by plugging them together.

[0027] In an advantageous embodiment, the supply lines extend through a cable gland, which is screwed into a threaded hole in the housing part. This is advantageous in that the supply lines pass through the housing part in a sealed manner, in particular in an explosion-proof manner, by means of the cable gland. In an advantageous embodiment, the first wire end ferrules are insulated, in particular with the outer surface of the first wire end ferrules surrounded by an insulating layer, in particular by an electrically insulating material. This is advantageous in that short circuits can be avoided.

[0028] In an advantageous embodiment, the coil has two partial windings electrically connected in series, with the center tap and the two outer terminals of the two partial windings being routed out as respective connecting lines, so that the number of connecting lines is three, in particular, and the number of supply lines is also three. This is advantageous in that a current can initially be built up very quickly to release the brake, with only one of the partial windings being energized, thus providing a low inductance. Subsequently, a smaller current can be used, energizing the entire coil.

[0029] Important features of the brake motor with electric motor and brake assembly are that the housing part is connected to the motor housing of the electric motor, so that the housing part and the motor housing enclose the brake. An advantage here is that the brake motor can be designed to be explosion-proof, as the brake is enclosed in an additional protective housing.

[0030] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art. The invention will now be explained in more detail with reference to schematic illustrations:

[0031] Figure 1 shows a first method step for producing a brake arrangement of a brake motor according to the invention in plan view, before the electrical connection lines of a coil, in particular a brake coil, of the brake arrangement are connected to supply lines.

[0032] Figure 2 shows a second manufacturing step, in which the electrical connection lines are connected to the supply lines.

[0033] In Figure 3, a ring plate 4 of the brake arrangement is shown separately.

[0034] In Figure 4, a connecting cable provided with a first wire end sleeve 22 and a supply cable provided with a second wire end sleeve 20 are shown in a first viewing direction in an oblique view.

[0035] In Figure 5, the connecting cable provided with the first wire end ferrule 22 and the supply cable provided with the second wire end ferrule 20 are shown in a second viewing direction in an oblique view.

[0036] In Figure 6, the connecting cable provided with the first wire end ferrule 22 and the supply cable provided with the second wire end ferrule 20 are shown connected to each other in a side view.

[0037] As shown in the figures, the brake assembly comprises a housing part 3 into which a brake is mounted. Preferably, the brake assembly is mounted on an electric motor to produce an explosion-proof brake motor, or the brake assembly is mounted on another component so that the brake assembly can be operated in an explosion-proof manner.

[0038] The brake has a braking surface part 1 with an axially continuous recess. A shaft (not shown in the figures), in particular a rotor shaft, extends through the braking surface part 1. The axial direction is aligned parallel to the shaft's axis of rotation. The radial direction and the circumferential direction are related to the shaft's axis of rotation.

[0039] A shaft to be braked by the brake assembly protrudes through the recess.

[0040] A disc-shaped brake pad carrier has internal teeth, with which it is mounted on an annular carrier, so that an external toothing of the carrier engages with the internal toothing. The carrier is connected to the shaft in a rotationally fixed manner, in particular by means of a keyway.

[0041] The brake pad carrier is connected to the carrier in a rotationally fixed manner and is arranged for axial displacement. The brake pad carrier has brake pads on both sides axially or is made entirely of brake pad material, i.e., in one piece and / or made of the brake pad material.

[0042] A ferromagnetic armature disk is arranged with a magnetic body that accommodates the coil in an annular recess in the magnetic body, in a rotationally fixed and axially displaceable manner. Preferably, axially directed bolts protrude through the armature disk, with the bolts being connected to the magnetic body.

[0043] The magnetic body is preferably made of ferromagnetic material.

[0044] Spring elements are supported on the magnet body, which press on the armature disc.

[0045] In the axial direction, the armature disc is arranged axially between the brake pad carrier and the magnet body.

[0046] The brake pad carrier is arranged axially between the armature disc and a brake surface machined on the brake surface part.

[0047] The brake surface part, together with the magnet body, forms a housing, either directly or with an annular intermediate ring, which encloses the coil, the armature disc, the spring elements, the brake pad carrier, and the driver. To create an explosion-proof design, the brake is mounted in a housing part 3. For this purpose, the brake surface part 1 has radially outwardly projecting ear regions spaced apart from one another in the circumferential direction, which are screwed to the housing part 3 with a respective screw 2.

[0048] Thus, the brake as a whole is arranged inside the housing part 3, making the brake assembly explosion-proof. Furthermore, the housing-forming function of the brake is improved by the quasi-redundant housing function of the housing part, in particular, it is designed with greater safety.

[0049] The coil is designed as a ring winding whose ring axis is aligned parallel to the axial direction.

[0050] When the coil is energized, the armature disk is pulled towards the magnet body against the spring force generated by the spring elements, so that the brake pad carrier has axial play between the braking surface and the armature disk.

[0051] When the coil is de-energized, the spring elements push the armature disc away from the magnet body and thus toward the brake pad carrier. The brake pad carrier is pressed by the armature disc onto the braking surface formed on the braking surface part 1. In this case, the brake is engaged and generates frictional heat, which is dissipated primarily via the braking surface part 1 to the housing part 3.

[0052] The brake is inserted into the housing part 3 in the axial direction.

[0053] The connecting lines of the coil, in particular the end regions of the winding wire, are led out radially from the brake and protrude in the axial direction beyond the brake, in particular radially between the brake and the housing part 3.

[0054] As shown in Figure 1, the housing part 1 is openly accessible axially at the front, as long as the electric motor is not connected to the housing part or to another component. The connecting cables are not shown in Figure 1.

[0055] An annular gap is formed between the housing part 1 and the brake, which is interrupted in the circumferential direction by the radially projecting ear regions of the braking surface part 1.

[0056] As shown in Figure 2, the connecting lines are accessible from the axial direction, in particular the viewing direction of Figure 1, since they protrude from the annular gap in the viewing direction, in particular in the axial direction, from the braking surface part 1.

[0057] The ends of the connecting cables are provided with first, in particular insulated, wire end ferrules 22.

[0058] As shown in Figure 2, a cable gland 21 is screwed into a radially continuous threaded bore of the housing part 3, wherein supply lines, which are also provided with wire end sleeves 20 at their ends, are led through the cable gland and thus through the housing part by means of the cable feedthrough, coming from the outside.

[0059] As a final process step for the production of the brake arrangement, the first wire end sleeves 22 are connected to the second, in particular insulated, wire end sleeves 20 of the supply lines

[0060] A terminal box top section can be placed on the outer surface of the housing part 3 containing the through-threaded hole into which the cable gland is screwed, so that the supply lines do not lead directly into the external environment, but are electrically and mechanically connected to connection elements arranged within the terminal box thus formed. From these connection elements, further supply lines then lead into the external environment, in particular through the wall of the terminal box top section.

[0061] Once the electric motor is mounted to the housing part 3, the connecting cables are no longer directly accessible from the outside. The braking surface part 1 is hollow, specifically ring-shaped. The brake lining carrier 6 moves back and forth in an axial direction when the brake is released and applied. Since the wire end ferrules (20, 22) are attached to the connecting cables and supply lines, there is a risk that the wire end ferrules (20, 22) could enter the aforementioned axial stroke range of the brake lining carrier 6. A ring plate 4 is provided to prevent this risk.

[0062] The annular plate 4 is arranged radially inside the braking surface part 1. In particular, the annular plate 4 is fastened to the braking surface part by means of axially aligned screws passing through the annular plate 4, in particular through lug regions 31 spaced apart in the circumferential direction and projecting radially outward on the annular plate 4, which are screwed into threaded holes of projections projecting radially inward on the braking surface part 1. Thus, the annular plate 4 is arranged axially between the wire end sleeves (20, 22) and the lining carrier 6. The wire end sleeves (20, 22) are thus spaced from the lining carrier 6 by means of the annular plate 4.

[0063] In the circumferential angle range covered by the wire end ferrules (20, 22), the annular plate 4 has a radially raised securing area 31. The radial spacing area covered by the securing area 31 encompasses the radial spacing area covered by the wire end ferrules (20, 22). The securing area 31 separates the wire end ferrules (20, 22) from the lining carrier 6.

[0064] The securing area 30 is spaced circumferentially from the tab areas 32.

[0065] The annular gap is interrupted several times in the circumferential direction, namely by the ear areas of the braking surface part 1.

[0066] Preferably, the wire end ferrules (20, 22) are attached to the annular plate 4 by means of asbestos wires. In particular, the asbestos wires encircle both the annular plate 4 and the wire end ferrules (20, 22). In further embodiments according to the invention, the braking surface part 1 is connected to a bearing shield or bearing flange, which accommodates a bearing, in particular a roller bearing, of the shaft. In particular, three connecting lines lead from the coil to the supply lines because the coil is designed as a split winding. To release the brake arrangement, initially only a first partial winding of the coil is energized, since a current can be built up more quickly due to the lower inductance. Later, the first partial winding and a second partial winding connected in series with it are energized, with a lower current then being sufficient for permanent release of the brake due to the higher inductance of the two partial windings connected in series.

[0067] List of reference symbols

[0068] 1 Brake surface part 2 Screw

[0069] 3 Housing part

[0070] 4 ring sheet

[0071] 5 Terminal box attachment, terminal box base

[0072] 6 Brake pad carrier, ring-shaped 22 First wire end sleeve

[0073] 5 Terminal box base

[0074] 20 second wire end ferrule

[0075] 21 Cable gland

[0076] 30 Securing area 31 Tab area

Claims

Patent claims:

1. Brake arrangement, in particular for an electric motor, for braking a shaft, the brake arrangement comprising a brake and a housing part, the brake comprising a lining carrier, in particular a brake lining carrier, which is connected to the shaft in a rotationally fixed manner and is movable in the axial direction, characterized in that an annular plate is fastened to an annular braking surface part of the brake, electrical connecting lines of the brake being spaced apart, in particular at least also, from the lining carrier, in particular axially, by means of the annular plate, the annular plate being arranged radially within the braking surface part and / or the annular plate being radially surrounded by the braking surface part, in particular the brake being actuable by means of a coil which can be electrically energized via the electrical connecting lines.

2. Brake arrangement according to claim 1, characterized in that the annular plate has a radially outwardly raised securing region which is arranged axially between the connecting lines and the lining carrier and / or spaced the connecting lines from the lining carrier.

3. Brake arrangement according to one of the preceding claims, characterized in that the annular plate has two tab regions which are spaced apart from one another in the circumferential direction and which protrude radially from the annular plate, in particular wherein screws screwed into threaded bores of the braking surface part pass through the tab regions, in particular and the screw heads of the screws press the tab regions onto projections projecting radially inwards on the braking surface part, in particular wherein the tab regions are spaced apart from one another.

4. Brake arrangement according to one of the preceding claims, characterized in that the ends of the connecting lines are provided with first, in particular insulated, wire end ferrules, the ends of supply lines are provided with second, in particular insulated, wire end ferrules, the first wire end ferrules are connected to the second wire end ferrules, in particular are plug-connected.

5. Brake arrangement according to one of the preceding claims, characterized in that the area covered by the securing area in the circumferential direction comprises the area covered by the two wire end ferrules in the circumferential direction and / or the radial spacing area covered by the securing area comprises the radial spacing area covered by the two wire end ferrules in the circumferential direction.

6. Brake arrangement according to one of the preceding claims, characterized in that the ring axis of the ring plate is aligned coaxially with the axis of rotation of the shaft and / or that the ring plate is flat.

7. Brake arrangement according to one of the preceding claims, characterized in that the brake and / or the braking surface part is or are surrounded by the housing part to form a housing.

8. Brake arrangement according to one of the preceding claims, characterized in that ear regions which project radially outwards and are spaced apart from one another in the circumferential direction are formed on the braking surface part of the brake, wherein the ear regions are connected to the housing part, in particular wherein the ear regions are each screwed to the housing part with a respective screw, in particular wherein the respective screw is screwed into an axially directed threaded bore of the housing part, in particular wherein the radial direction is related to the axis of rotation of the shaft and / or the axial direction and the circumferential direction are related to the axis of rotation of the shaft.

9. Brake arrangement according to one of the preceding claims, characterized in that the projections projecting radially inwards are spaced apart in the circumferential direction from the ear regions projecting radially outwards, and / or that the radial spacing region covered by the brake and / or by the ear regions is encompassed by or overlaps with the radial spacing region covered by the housing part, and / or that the brake has an electrically energizable coil, the connecting lines of which are led radially out of the brake and project in the axial direction in an annular gap arranged between the brake and the housing part.

10. Brake arrangement according to one of the preceding claims, characterized in that the connecting lines are provided at their ends with first wire end ferrules which are plug-connected to second wire end ferrules, and / or that the second wire end ferrules are arranged at the respective ends of respective supply lines.

11. Brake arrangement according to one of the preceding claims, characterized in that the supply lines protrude through a cable gland which is screwed into a threaded bore of the housing part passing through the housing part.

12. Brake arrangement according to one of the preceding claims, characterized in that the first wire end ferrules are insulated, in particular wherein the outer surface of the first wire end ferrules is surrounded by an insulating layer, in particular by an electrically insulating material.

13. Brake arrangement according to one of the preceding claims, characterized in that the coil has two partial windings electrically connected in series with one another, wherein the center tap and the two outer terminals of the two partial windings are led out as respective connecting lines, so that the number of connecting lines is three, in particular and the number of supply lines is also three.

14. Brake arrangement according to one of the preceding claims, characterized in that the braking surface part is connected to a magnetic body of the brake, wherein an electrically energizable coil is accommodated in an annular recess of the magnetic body, wherein spring elements supported on the magnetic body press on a ferromagnetic armature disk arranged axially between the lining carrier and the magnetic body, wherein the lining carrier is arranged axially between the armature disk and a braking surface formed on the braking surface part, wherein the armature disk is arranged in a rotationally fixed manner with respect to the magnetic body and is axially displaceable, in particular by bolts attached to the magnetic body passing through the armature disk in the axial direction, in particular wherein when the coil is energized, the armature disk is moved towards the magnetic body against the spring force generated by the spring elements, and when the coil is not energized, the spring elements press the armature disk onto the lining carrier,so that the lining carrier is pressed on its side facing away from the armature plate onto the braking surface of the braking surface part.

15. Brake motor with electric motor and brake arrangement according to one of the preceding claims, characterized in that the housing part is connected to a motor housing of the electric motor, so that the housing part encloses the brake with the motor housing.

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