Brush module and assembly method

Abstract

The invention relates to a brush module (10) and to a method for transmitting electric currents between a rotor part of a machine and a stator part of the machine, in particular an electric machine, electric motor or the like, wherein the brush module comprises at least one brush (12) for electrically contacting the rotor part of the machine and a brush holder (13) for receiving and holding the brush, wherein the brush holder is formed with a U-shaped sheet-metal bracket (14) which engages over the brush, wherein the sheet-metal bracket has laterally protruding mounting tabs (15, 16) for fastening the brush holder to a mounting surface (17), wherein the brush holder has a receptacle (19) in which the brush is held in a longitudinally displaceable manner and which has a spring device (21), wherein a pressing force can be exerted on the brush in the direction of a longitudinal axis (29) of the receptacle by means of the spring device, wherein the spring device has a spring element (11), wherein the spring element has a pressing limb (24) for exerting the pressing force on the brush and has a retaining limb (25) for holding the brush in a retaining position (26), wherein the retaining limb is designed to be movable transversely to the longitudinal axis in such a way that the retaining limb releases the brush during a movement transversely to the longitudinal axis and the brush can be moved into a contact position.

Description

[0001] Brush module and assembly method

[0002] The invention relates to a brush module and a method for assembling a brush module for transmitting electrical currents between a rotor part of a machine and a stator part of the machine, in particular an electrical machine, electric motor or the like, wherein the brush module has at least one brush for electrically contacting the rotor part of the machine and a brush holder for receiving and holding the brush, wherein the brush holder is designed with a U-shaped sheet metal angle which engages over the brush, wherein the sheet metal angle has laterally projecting mounting tabs for fastening the brush holder to a mounting surface, wherein the brush holder has a receptacle in which the brush is held so as to be longitudinally displaceable and a spring device, wherein by means of the spring device a pressing force can be exerted on the brush in the direction of a longitudinal axis of the receptacle.

[0003] Such brush modules are well known in the art and are typically used to position and secure a brush, for example, to a slip ring or commutator of an electric motor, or to divert currents from the rotor part or a shaft or axle of the machine. The brush, which may be a carbon brush, for example, is then arranged in a brush holder that essentially surrounds the brush on its longitudinal sides and is held in the brush holder for longitudinal movement. A spring force is applied to the brush by means of a spring device and pressed toward the rotor part, so that the brush is pressed against the rotor part to establish an electrical contact.A disadvantage of the known brush modules is that the brush is always pushed out of the brush holder by the action of the spring force and therefore mounting the brush holder on the electrical machine is difficult.

[0004] For example, precise positioning of a brush holder using screws, which are to be inserted into mounting brackets, is made more difficult due to a spring force caused by the brush being in contact with the rotor part. It is also known to lock the brush in a retaining position in the brush holder using fastening means in order to facilitate installation of the brush module on the machine or the rotor part. For example, the brush can be locked with a pin which must be removed after installation of the brush module. Cylindrical installation aids are also known which are intended to make it easier to slide a brush module or a plurality of brushes arranged around a rotor part onto the rotor part. EP 3 895 259 discloses a brush module which, during installation, is deformed by screwing in such a way that a brush is unlocked and pressed against a rotor part by means of a spring element.The known brush modules require additional components to lock the brush and therefore additional work steps in the manufacture of the brush module and its assembly.

[0005] In particular, cylindrical assembly aids make access to an installation space on the machine and thus installation of the brush module more difficult. Furthermore, the assembly aid is required here as an additional component that must be individually adapted to the diameter of the rotor part. Deforming the brush holder, for example by bending away a sheet metal hook when installing the brush module on the machine, also requires additional work steps, as the brush module must be designed with other components. In addition, the brush is already released during assembly of the brush module, so that an assembly sequence of the machine is mandatory. Releasing the brush after the brush module has been installed in an installation space that may no longer be fully accessible after assembly is not possible in this case.In principle, it would also be possible to complete the brush module during assembly of the brush holder on the machine, i.e., by mounting the brush and the spring assembly on the machine. However, this is only possible in a cumbersome and time-consuming manner due to the often limited installation space on machines.

[0006] The present invention is therefore based on the object of proposing a brush module and a method for assembling a brush module which enables simpler assembly of the brush module and cost-effective production thereof.

[0007] This object is achieved by a brush module having the features of claim 1, a machine having the features of claim 18 and a method for assembling a brush module having the features of claim 19.

[0008] The brush module according to the invention for transmitting electrical currents between a rotor part of a machine and a stator part of the machine, in particular an electric machine, electric motor or the like, has at least one brush for electrically contacting the rotor part of the machine and a brush holder for receiving and holding the brush, wherein the brush holder is formed with a U-shaped sheet metal angle that engages over the brush, wherein the sheet metal angle has laterally projecting mounting tabs for fastening the brush holder to a mounting surface, wherein the brush holder has a receptacle in which the brush is held in a longitudinally displaceable manner and a spring device, wherein by means of the spring device a pressure force can be exerted on the brush in the direction of a longitudinal axis of the receptacle, wherein the spring device has a spring element,wherein the spring element has a pressure leg for exerting the pressure force on the brush and a retaining leg for holding the brush in a retaining position, wherein the retaining leg is designed to be movable transversely to the longitudinal axis such that the retaining leg releases the brush upon movement transversely to the longitudinal axis and the brush can be moved into a contact position.

[0009] The brush module according to the invention is in principle suitable for transmitting electrical currents to any type of machine with a rotor part and a stator part. In addition to electrical machines such as electric motors or the like, in which current is transmitted via slip rings or commutators, the brush module can also be used to divert induced currents on shafts or axles of machines. The rotor part can be in direct or indirect contact with the brush of the brush module, for example via a slip ring. The brush holder of the brush module forms a receptacle in the manner of a shaft with the egg-shaped sheet metal angle, in which the brush or carbon brush is accommodated for longitudinal movement. In principle, however, it is also possible to provide a shaft in addition to the U-shaped sheet metal angle, which accommodates the brush and is then held by the U-shaped sheet metal angle.However, to reduce the number of components, it is preferably provided that the brush rests on the mounting surface on the machine and the U-shaped sheet metal angle directly surrounds the brush like a clamp. A receiving space for the brushes is then formed by three side surfaces of the U-shaped sheet metal angle and by the mounting surface. The mounting tabs are arranged laterally on the U-shaped sheet metal angle such that they project laterally from the sheet metal angle in opposite directions relative to a longitudinal axis of the latter. When the brush module is fastened or in an assembly configuration, the mounting tabs rest against the mounting surface together with the brush or are arranged in a common assembly plane. The brush holder is further designed such that the spring element with the pressure leg exerts the pressure on the brush such that the brush is pressed towards the rotor part.At the same time, the retaining leg of the spring element prevents the brush from actually reaching the rotor part in such a way that the retaining leg holds the brush in a form-fitting manner in the retained position. The pressure force of the pressure leg then acts against the retaining leg. The retaining leg can act on any point on the brush in such a way that the brush cannot be moved further along the brush holder or does not protrude so far from the brush holder that the brush would be a hindrance when the brush module is mounted on a machine. The brush module is further designed in such a way that the retaining leg can be moved or pivoted transversely to the longitudinal axis of the holder. It is provided that during this movement the retaining leg releases the brush so that the brush is no longer held by the retaining leg and only the pressure force of the pressure leg can act on the brush.This moves the brush into the contact position on the rotor part of the machine. The pivoting of the retaining leg can only take place once assembly of the brush module is completely finished. Because the brush module can consist solely of the brush, the U-shaped sheet metal angle, and the spring element, the brush module is simple and cost-effective to manufacture and assemble. Furthermore, no special fastening elements on the brush need to be removed, meaning that full access to the brush module is not required after assembly, and the brush module can also be installed in a very small installation space. Overall, this can also significantly simplify the assembly effort of the brush module or the machine.

[0010] The U-shaped sheet metal bracket can form the mount. This makes it possible to dispense with the need for an additional component to form the mount. The U-shaped sheet metal bracket can be designed in such a way that the mount is designed like a shaft for the brush. The brush can then move along the longitudinal axis of the mount toward the rotor part. A longitudinal axis of the brush and the longitudinal axis of the mount can then be essentially aligned.

[0011] The brush module can have a carrier that can form the mounting surface. The carrier can, for example, be designed in the form of a plate, which then forms a flat mounting surface. The carrier can be designed such that it can be easily attached to the stator part of the machine.

[0012] The support can be designed as a ring that at least partially, preferably completely, surrounds the rotor part. The ring can be made of sheet metal and have a circular surface that forms the mounting surface. The ring can also be formed with a radial shoulder, which can then come into contact with an inner surface or an inner diameter of the stator part. The ring can then be easily mounted and centered on the stator part by pressing it in.

[0013] Furthermore, the brush module can have a plurality of brush holders that can be attached to the carrier. The plurality of brush holders can then surround the rotor part of the machine and, in particular, be arranged such that the brush holders are equidistant from one another with respect to a circumference of the rotor part. For example, the brush module can have at least two, three, four, five or more brush holders. Longitudinal axes of the brushes then run orthogonally to a rotation axis of the rotor part. According to a further embodiment, the mounting surface can be an inner surface of a housing part of the machine. The brush module then does not include the mounting surface formed by the machine. The mounting surface can be formed here by a component or housing part of the stator part of the machine, whereby a carrier can be dispensed with.The mounting surface can be flat, allowing the U-shaped sheet metal bracket to be attached to the mounting surface. Preferably, the mounting surface is then located in a mounting plane that is orthogonal to a rotational axis of the rotor part.

[0014] The brush holder can be attached to the mounting surface using screws, rivets, welding, soldering, flanging, or gluing. Through-holes for a screw can be provided in each of the mounting tabs. The through-holes can be designed as a bore, an elongated hole, or a slot. This makes it possible to securely fasten the brush module or the U-shaped sheet metal bracket to the machine with a force-fitting and / or form-fitting connection. If the through-holes are designed with sufficient play, fine adjustment of the brush module in a mounting position is also possible. Furthermore, attachment to the mounting surface can also be easily achieved by welding, in particular resistance welding, spot welding, or similar.

[0015] At a pressure end of the brush facing away from the rotor part, a groove can be formed running in a direction transverse to a longitudinal axis of the brush, wherein the pressure leg can engage in the groove. The groove can, for example, be formed with a V-shaped or U-shaped cross-section in the brush. Furthermore, the groove can run along a width of the brush, i.e. in the circumferential direction or in the radial direction relative to a circumference of the rotor part. The pressure leg can then likewise be oriented in the radial direction and engage in the groove at least in sections. The pressure leg can be centered in the groove by its cross-section. Furthermore, the pressure leg can also be moved along the groove, for example when the brush is moved from the retaining position to the contact position.If the length of the brush is shortened due to abrasive wear of the brush material, it is always ensured that the pressure leg rests on the pressure end of the brush.

[0016] In the retaining position of the brush, the retaining leg can rest against a contact end of the brush facing the rotor part. In the contact position, the contact end can rest directly against the rotor part of the machine for transmitting electrical currents. The contact end can be flat or designed with a radius that is adapted to a diameter of the rotor part to be contacted. If the retaining leg rests against the contact end in the retaining position, the retaining leg can be easily operated manually and moved or pivoted, even in confined spaces, so that the contact end is released from the retaining leg and the brush can be transferred into the contact position.

[0017] The spring element can be a leg spring. The leg spring can be formed with a plurality of coils, for example three coils, and have the pressure leg and the retaining leg. The spring element or leg spring is then formed in one piece. A leg spring is particularly simple and cost-effective to produce and, due to the coils, can be formed with a substantially constant spring characteristic. Alternatively, it is also possible for the spring element to be formed by a leaf spring, which in turn forms the pressure leg and the retaining leg. Furthermore, the spring element can also be a roller track spring with the retaining leg then formed thereon. If the spring element is in one piece, the number of components of the brush module can be further reduced. The pressure leg can be designed to be cranked in a direction towards the brush. Due to the cranking orBy bending the pressure leg towards the brush or towards a pressure end of the brush, it can be ensured that the pressure leg always rests against the pressure end of the brush. Shortening the length of the brush due to abrasive removal or movement into the contact position causes the brush or the pressure end to move along the longitudinal axis of the holder towards the rotor part. To ensure that the pressure end always rests against the brush, the pressure end must be able to engage in the holder even with a significantly shortened brush. This can be advantageously achieved if the pressure leg is offset.

[0018] The retaining leg can be bent in a direction transverse to the longitudinal axis. The retaining leg can then be bent in sections in the direction of the pressure leg. If the retaining leg and the pressure leg are spaced from one another, for example by windings of the spring element, the bent retaining leg can be positioned in opposition to the pressure leg. Thus, in the retaining position, a contact point of the pressure leg can lie substantially in opposition to a contact point of the retaining leg on the brush. Furthermore, it can be provided that the movement of the retaining leg occurs transversely to the longitudinal axis of the brush, opposite to the direction of the bend or orientation of the retaining leg.

[0019] The brush holder can have a mounting lug with a fastening projection for holding the spring element on coils of the spring element. If the spring element is formed by a leg spring, the spring can then be easily held by its coils on the mounting projection. The fastening projection can extend through the coils and be formed by an angled lug. The coils can then surround the lug, whereby the lug can be dimensioned such that a width of the lug essentially corresponds to an inner diameter of the coils of the spring element. A cranked or angled end of the lug can partially overlap the coils of the spring element, so that the spring element is then securely held on the brush holder or the mounting lug and cannot be easily detached from it. At the same time, the spring element can be mounted by simply pushing it onto the fastening projection.Optionally, the fastening projection can be formed by another component, for example a cylinder onto which the windings can be attached.

[0020] The brush holder can form a contact projection on a mounting tab for contact with the outer side of the retaining leg facing away from the brush, wherein the retaining leg can form a stop for the brush and the brush can be positioned in the retaining position. The contact projection can be designed here as a tab on the mounting tab, which largely prevents movement of the retaining leg in the direction of the rotor part. The retaining leg then rests against the tab with its outer side facing away from the brush. As a result, the retaining leg also forms the stop for the brush, since the brush can then no longer be moved further in the direction of the rotor part. The brush is then positioned in the retaining position by contacting the retaining leg.

[0021] The brush holder can form a recess on the U-shaped sheet metal angle for the contact of an inner side of the retaining leg facing the brush and for positioning the retaining leg on the U-shaped sheet metal angle, wherein the retaining leg can form a stop for the brush and the brush can be positioned in the retaining position. The recess can be U-shaped or V-shaped in the manner of a notch in the sheet metal of the U-shaped sheet metal angle. The inner side of the retaining leg can then be centered and precisely positioned relative to the brush by contact with the recess. The positioning of the retaining leg can be such that the retaining leg prevents movement of the brush in the direction of the rotor part and thus forms a stop for the brush and thus positions or holds the brush in the retaining position.The recess ensures that the retaining leg is not accidentally moved and that the brush moves from the retaining position to the contact position. If the brush module forms a stop for an outer side of the retaining leg facing away from the brush, the retaining leg can be held or clamped between the contact projection and the recess with a slight play or by developing a spring force on the retaining leg.

[0022] The brush holder can form a holding projection on the U-shaped sheet metal angle for contacting an inner side of the retaining leg facing the brush, wherein the retaining leg can be moved transversely to the longitudinal axis and in the direction of the holding projection, wherein the retaining leg can release the brush and the pressure leg can position the brush in the contact position. The holding projection can be designed, for example, as a tab that can be angled or cranked. The holding projection can be formed on an upper side or a side of the U-shaped sheet metal angle facing the rotor part. If the retaining leg is moved, for example, from a recess on the U-shaped sheet metal angle transversely to the longitudinal axis of the holder, the brush is then released such that the pressure leg presses the brush into the contact position.To secure the retaining leg, it can now be moved toward the retaining projection, resting its inner side against it. The spring force of the retaining leg then acts in the direction of the retaining projection. This is particularly advantageous when the spring element is a leg spring, as it prevents unwanted relaxation of the leg spring.

[0023] The brush can be made primarily of graphite and formed in one piece. The brush can also be made entirely of graphite or, alternatively, of a mixture of graphite and a metal. Relative to the contact area of ​​the brush with the rotor part, the brush can have a thickness that is equal to or smaller than its width. For example, the thickness-to-width ratio can be approximately 1:2, 1:4, 1:6, or 1:8.

[0024] The machine according to the invention, in particular an electric machine, electric motor, or the like, has at least one brush module according to the invention. Further advantageous embodiments of the machine emerge from the description of the features of the subclaims referring back to device claim 1.

[0025] In the method according to the invention for mounting a brush module on a machine, in particular an electric machine, electric motor or the like, electrical currents are transmitted between a rotor part of the machine and a stator part of the machine by means of the brush module, wherein the rotor part of the machine is electrically contacted by means of at least one brush of the brush module and the brush is received and held by a brush holder of the brush module, wherein the brush holder is formed with a U-shaped sheet metal angle that engages over the brush, wherein the brush holder is fastened to a mounting surface by means of mounting tabs projecting laterally from the sheet metal angle, wherein the brush is held in a receptacle of the brush holder for longitudinal displacement, wherein a pressure force is exerted on the brush in the direction of a longitudinal axis of the receptacle by means of a spring device,The pressure force is exerted on the brush by means of a pressure leg of a spring element of the spring device, and the brush is held in a retaining position by means of a retaining leg of the spring element. The retaining leg is moved transversely to the longitudinal axis in such a way that the retaining leg releases the brush during the movement transversely to the longitudinal axis, and the brush is moved into a contact position. For the advantages of the method according to the invention, reference is made to the description of the advantages of the device according to the invention.

[0026] Further advantageous embodiments of the method emerge from the description of features of the subclaims referring back to device claim 1.

[0027] The invention is explained in more detail below with reference to the accompanying drawings.

[0028] They show:

[0029] Fig. 1 is a partial perspective view of a brush module;

[0030] Fig. 2 is a further perspective partial view of the brush module from Fig. 1;

[0031] Fig. 3 a side view of a spring element;

[0032] Fig. 4 is a plan view of the spring element from Fig. 3;

[0033] Fig. 5 is a further perspective partial view of the brush module from Fig. 1.

[0034] A combination of Fig. 1 to Fig. 5 shows a brush module 10 and a spring element 11 of the brush module 10 in various representations. The brush module 10 is used to transmit electrical currents between a rotor part of a machine and a stator part of the machine. The brush module is formed from a brush 12 for electrically contacting the rotor part of the machine and a brush holder 13 for receiving and holding the brush 12. The brush holder 13 has a U-shaped sheet metal bracket 14 which engages over the brush 12. The sheet metal bracket 14 has laterally projecting mounting tabs 15 and 16 with which the U-shaped sheet metal bracket 14 is fastened to a mounting surface 17 of a carrier 18. The U-shaped sheet metal bracket 14 and the carrier 18 thus form a receptacle 19 for the brush 12, within which the brush 12 is mounted so as to be movable in the direction of a longitudinal axis 20 of the receptacle 19.A spring device 21 of the brush module 10 is formed by the spring element 11, which is a leg spring 22 with windings 23 and a pressure leg 24 and a retaining leg 25.

[0035] The retaining leg 25 serves to position or release the brush 12 in the retaining position 26 shown in Fig. 1 and Fig. 2, so that the brush 12 can assume the contact position 27 shown in Fig. 5 on the rotor part not shown here.

[0036] The carrier 18 is designed here as a ring 28 with a radially circumferential shoulder 29, wherein the shoulder 29 can be pressed into a stator part of the machine (not shown in detail here). Additional brush holders 13 can also be located on the ring 28.

[0037] At a pressure end 30 of the brush 12 facing away from the rotor part, a groove 31 is formed into which the pressure leg 24 engages. The pressure leg 24 is formed with a cranked section 32, so that a continuous application of a pressure force in the direction of the rotor part to the pressure end 30 is ensured, regardless of a shortened length of the brush 12 due to wear. In the retaining position 26 of the brush 12, the retaining leg 25 rests against a contact end 33 of the brush 12 facing the rotor part and has a cranked section 34 that extends in the direction of the pressure leg 24.

[0038] Furthermore, a fastening projection 35 is provided on the mounting tab 16, which is formed by a tab 36 with an angled end 37. The tab 36 extends through the coils 23, which are partially covered by the end 37, so that the leg spring 22, in its illustrated position, is captively fastened to the U-shaped sheet metal angle 14. Furthermore, a contact projection 38 in the form of a tab 39 is formed on the mounting tab 16. The retaining leg 25 rests against the tab 39 with an outer side 40. Furthermore, the retaining leg 25 rests with an inner side 41 against a recess 42 in a front edge 43 of the U-shaped sheet metal angle 14. The retaining leg 25 can thus be securely fixed and clamped between the recess 42 or the front edge 43 and the contact projection 38.

[0039] To release the brush 12, the retaining leg 25 is pivoted out of the recess 42 such that the contact end 33 is released and the brush 12 can reach the rotor part of the machine due to the pressure force. The retaining leg 25 is then secured to a retaining projection 44 formed on the U-shaped sheet metal bracket 14. The retaining projection 44 is formed by a tab 45 with an angled end 46. The end 46 engages over the retaining leg 25 such that it is securely positioned.

Claims

Patent claims 1. Brush module (10) for transmitting electrical currents between a rotor part of a machine and a stator part of the machine, in particular an electric machine, electric motor or the like, wherein the brush module has at least one brush (12) for electrically contacting the rotor part of the machine and a brush holder (13) for receiving and holding the brush, wherein the brush holder is formed with a U-shaped sheet metal angle (14) which engages over the brush, wherein the sheet metal angle has laterally projecting mounting tabs (15, 16) for fastening the brush holder to a mounting surface (17), wherein the brush holder has a receptacle (19) in which the brush is held in a longitudinally displaceable manner and a spring device (21), wherein by means of the spring device a pressing force can be exerted on the brush in the direction of a longitudinal axis (20) of the receptacle, characterized in that the spring device has a spring element (11),wherein the spring element has a pressure leg (24) for exerting the pressure force on the brush and a retaining leg (25) for holding the brush in a retaining position (26), wherein the retaining leg is designed to be movable transversely to the longitudinal axis in such a way, is that the retaining leg releases the brush during a movement transverse to the longitudinal axis and the brush can be moved into a contact position (27).

2. Brush module according to claim 1, characterized in that the U-shaped sheet metal angle (14) forms the receptacle (19).

3. Brush module according to claim 1 or 2, characterized in that the brush module (10) has a carrier (18) which forms the mounting surface (17).

4. Brush module according to claim 3, characterized in that the carrier (18) is designed as a ring (28) which at least partially, preferably completely, surrounds the rotor part.

5. Brush module according to claim 3 or 4, characterized in that the brush module (10) has a plurality of brush holders (13) which are fastened to the carrier (18).

6. Brush module according to claim 1 or 2, characterized in that the mounting surface (17) is an inner surface of a housing part of the machine.

7. Brush module according to one of the preceding claims, characterized in that the brush holder (10) is fixed to the mounting surface (17) by means of Screws, rivets, welding, soldering, flanging or gluing.

8. Brush module according to one of the preceding claims, characterized in that a groove (31) running in a direction transverse to a longitudinal axis of the brush is formed on a pressure end (30) of the brush (12) facing away from the rotor part, the pressure leg (24) engaging in the groove.

9. Brush module according to one of the preceding claims, characterized in that the retaining leg (25) in the retaining position (26) of the brush (12) rests against a contact end (33) of the brush facing the rotor part.

10. Brush module according to one of the preceding claims, characterized in that the spring element (11) is a leg spring (22).

11. Brush module according to one of the preceding claims, characterized in that the pressure leg (24) is designed to be cranked in a direction towards the brush (12).

12. Brush module according to one of the preceding claims, characterized in that the retaining leg (25) is designed to be cranked in a direction transverse to the longitudinal axis (20).

13. Brush module according to one of the preceding claims, characterized in that the brush holder (13) forms a fastening projection (35) on a mounting tab (16) for holding the spring element (11) on windings (23) of the spring element.

14. Brush module according to one of the preceding claims, characterized in that the brush holder (13) forms a contact projection (38) on a mounting tab (16) for contacting an outer side (40) of the retaining leg (25) facing away from the brush (12), wherein the retaining leg forms a stop for the brush and positions the brush in the retaining position (26).

15. Brush module according to one of the preceding claims, characterized in that the brush holder (13) forms a recess (42) on the U-shaped sheet metal angle (14) for the abutment of an inner side (41) of the retaining leg (25) facing the brush (12) and positioning of the retaining leg on the U-shaped sheet metal angle, wherein the retaining leg forms a stop for the brush and positions the brush in the retaining position (26).

16. Brush module according to one of the preceding claims, characterized in that the brush holder (13) forms a holding projection (44) on the U-shaped sheet metal angle (14) for abutting an inner side (41) of the retaining leg (25) facing the brush (12), wherein the retaining leg is movable transversely to the longitudinal axis (20) and in the direction of the holding projection, wherein the retaining leg releases the brush and the pressure leg (24) positions the brush in the contact position (27).

17. Brush module according to one of the preceding claims, characterized in that the brush (12) consists predominantly of graphite and is formed in one piece.

18. Machine, in particular an electric machine, electric motor or the like, wherein the machine has at least one brush module (10) according to one of the preceding claims.

19. A method for mounting a brush module (10) on a machine, in particular an electric machine, electric motor, or the like, wherein the brush module transmits electrical currents between a rotor part of the machine and a stator part of the machine, wherein the rotor part of the machine is electrically contacted by at least one brush (12) of the brush module, and the brush is received and held by a brush holder (13) of the brush module, wherein the brush holder is formed with an egg-shaped sheet metal bracket (14) that engages over the brush, wherein the brush holder is fastened to a mounting surface (17) by means of mounting tabs (15, 16) projecting laterally from the sheet metal bracket, wherein the brush is held in a receptacle (19) of the brush holder for longitudinal displacement, wherein a pressure force is exerted on the brush in the direction of a longitudinal axis (20) of the receptacle by means of a spring device (21) of the brush holder,characterized in that the pressure force is exerted on the brush by means of a pressure leg (24) of a spring element (11) of the spring device and the brush is held in a retaining position (26) by means of a retaining leg (25) of the spring element, wherein the retaining leg is moved transversely to the longitudinal axis in such a way that the retaining leg, during the movement transversely to the longitudinal axis, Brush is released and the brush is moved into a contact position (27).

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