Drum brake device for an electric vehicle and electric vehicle with the drum brake device

Abstract

Drum brake device (1) for an electric vehicle (2), with a brake drum assembly (3), wherein the brake drum assembly (3) forms a brake chamber (14), and with a braking device (4), wherein the braking device (4) has brake shoes (5) and wherein the braking device (4) is designed and / or arranged to press the brake shoes (5) against an inner circumference of the brake drum (11) in the brake chamber (14) in order to generate a braking torque and convert kinetic energy into heat energy, with a cooling device (16) for removing the heat energy via a cooling fluid, wherein the cooling device (16) forms a fluid chamber (18) wherein the cooling fluid is arranged in the fluid chamber (18) and wherein the brake drum device (3) is arranged in the fluid chamber (18) such that the brake chamber (14) is arranged in the fluid chamber (18) and is thereby arranged in a fluid-tight and / or dust-tight manner relative to an environment (101), characterized by a connection axis (9) for connecting the brake device (4) to a stationary brake partner, wherein the brake drum device (3) is mounted relative to the connection axis (9) and is fluid-tight sealed via a first sealing device (25), wherein the brake drum device (3) forms a first sealing partner and the connection axis (9) a second sealing partner, so that the brake chamber (14) is fluid-tight and thus also dust-tight sealed against the fluid chamber (18) by the first sealing device (25), and characterized by a connecting shaft (10) for connecting the brake drum assembly (3) to a rotating brake partner, wherein the connecting shaft (10) is mounted relative to the cooling device (16) and is fluid-tight sealed via a second sealing device (26), wherein the cooling device (16) forms a first sealing partner and the connecting shaft (10) forms a second sealing partner, so that the fluid space (18) is fluid-tight sealed against the environment (101) by the second sealing device (26).

Description

[0001] The invention relates to a braking device for an electric vehicle having the features of the preamble of claim 1. The invention also relates to an electric vehicle having the drum braking device.

[0002] Braking systems are commonly used in vehicles to slow them down in traffic. Disc brake systems are often used, but drum brake systems are also used alternatively, particularly on rear wheels. Drum brake systems are characterized by the fact that they have a brake drum, which is closed at least in the circumferential direction and forms a flat cylindrical surface as a counter surface to a friction lining. Due to the closed counter surface, cooling a drum brake system is more difficult than a disc brake system, which has a free-running counter surface.

[0003] For effective cooling of a drum brake system, publication CN 206582258 U proposes a drum brake with a circumferential water jacket wall adjacent to the counter surface, wherein cooling fluid can be transported in the water jacket wall to actively cool the brake drum. A drum brake device according to the preamble of claim 1 is known from DE 94 47 03 B. Further prior art is disclosed in GB 92 81 90 A, DE 120 62 23 A, CN 108 180 236 A, DE 10 2020 214 433 A1, DE 10 2012 211 522 A1, and DE 10 2014 211 447 A1.

[0004] It is an object of the present invention to propose a drum brake device for an electric vehicle which is characterized by a high level of environmental awareness.

[0005] This object is achieved by a drum brake device having the features of claim 1 and by an electric vehicle having the features of claim 8. Preferred and / or advantageous embodiments of the invention emerge from the subclaims, the following description and the attached figures.

[0006] The subject matter of the invention is a drum brake device that is particularly suitable and / or designed for an electric vehicle. The electric vehicle can be designed as a purely electric vehicle or, alternatively, as a hybrid vehicle. In particular, the electric vehicle is designed as a passenger car, truck, and / or bus. Specifically, the electric vehicle is designed as a BEV (battery electric vehicle).

[0007] The drum brake device has a brake drum device, wherein the brake drum device forms a braking chamber. The brake drum device comprises, in particular, a brake drum, wherein the brake drum has a preferably straight inner cylindrical surface on its inner circumference, which forms a braking surface. The brake drum device forms a rotating braking partner of the drum brake device.

[0008] Furthermore, the drum brake device comprises a braking device, wherein the braking device comprises brake shoes which can be pressed, in particular, in a frictional manner against the braking surface of the brake drum device, in particular the brake drum. The braking device comprises, in particular, a brake actuator which enables the brake shoes to be pressed against the brake drum device in a radial direction with respect to a main axis of rotation. At least the brake shoes are arranged in the braking chamber. Upon frictional contact between the brake shoes and the braking surface of the brake drum device, a braking torque is generated, wherein kinetic energy, in particular of the electric vehicle, is converted into thermal energy, which is initially present in the drum brake device.

[0009] The drum brake device has a cooling device for dissipating the thermal energy generated during the conversion of kinetic energy into thermal energy via a cooling fluid. The cooling fluid can be a water-based cooling fluid or an oil-based cooling fluid, in particular a transmission oil.

[0010] Within the scope of the invention, it is proposed that the cooling device form a fluid chamber, wherein the cooling fluid is arranged, in particular, in an open manner. The fluid chamber can be partially or completely filled with the cooling fluid and / or permanently or only temporarily.

[0011] The brake drum device is arranged in the fluid chamber, so that, on the one hand, the brake drum device is cooled by the cooling fluid. On the other hand, the arrangement of the brake chamber in the fluid chamber ensures that the brake chamber is fluid-tight and thus also dust-tight from the surroundings of the drum brake device. In particular, the brake drum device and / or the brake chamber are encapsulated in the fluid chamber and / or in the cooling device.

[0012] One of the concepts behind the invention is that, in addition to cooling, the cooling device can also be used to reliably prevent brake dust particle emissions from the drum brake device into the environment. While purely mechanical covers for drum brakes have the disadvantage that, due to the fact that drum brakes each have a stationary and a rotating section, transition areas are always present between the sections through which brake dust particles can escape into the environment as emissions.

[0013] In contrast, the invention provides that the brake drum device, and thus the actual brake chamber in which the brake dust particles are generated, is encapsulated in the fluid chamber. Due to the cooling fluid, the fluid chamber must even be fluid-tight from the environment. This ensures that no brake dust particles can enter the fluid chamber from the brake chamber. In the unlikely event that this should happen, the brake dust is trapped in the cooling fluid of the fluid chamber and cannot escape into the environment. This ensures that the drum brake device is designed in an environmentally friendly manner. Furthermore, future legislation will limit particulate matter pollution from automobiles.The invention provides a solution to prevent the emission of brake dust particles into the environment and, optionally, at the same time, by utilizing the waste heat from the brakes, i.e. the thermal energy, to extend the range / increase the efficiency of the electric vehicle.

[0014] In a preferred embodiment of the invention, the drum brake device is designed as a dry brake device. Thus, a fluid-tight seal is arranged between the brake chamber and the fluid chamber, so that the fluid-tight seal reliably prevents the transfer of brake dust from the brake chamber into the fluid chamber.

[0015] According to the invention, the drum brake device has a connection axis for connecting the braking device to a stationary braking partner. For example, the braking device can be connected to a chassis of the electric vehicle via the connection axis. The brake drum is rotatably mounted relative to the connection axis, and in particular on the connection axis, and is sealed in a fluid-tight manner via a first sealing device. The brake drum device forms a first sealing partner, and the connection axis forms a second sealing partner, so that the braking chamber is sealed in a fluid-tight and thus also dust-tight manner from the fluid chamber by the first sealing device.

[0016] According to the invention, the drum brake device has a connecting shaft for connecting the brake drum device to a rotating braking partner. The rotating braking partner can form part of the drive train of the electric vehicle. However, it can also be provided that the rotating braking partner is a wheel or a shaft of a passive axle of the electric vehicle. The cooling device is rotatably mounted relative to the connecting shaft and in particular on the connecting shaft. The cooling device is fluid-tightly sealed by a second sealing device, wherein the cooling device forms a first sealing partner and the connecting shaft forms a second sealing partner, such that the fluid space is fluid-tightly sealed against the environment by the second sealing device.

[0017] The drum brake device is preferably designed as an end section and / or as a termination of a torque path into the drum brake device. In particular, an applied drive torque is not transmitted through the drum brake device. Alternatively or additionally, the drum brake device is connected to a torque path or the torque path only on one side.

[0018] In principle, the sealing devices can be designed as contactless seals. Particularly preferably, they are implemented as contact and / or touch seals, thus improving the sealing effect.

[0019] The shortest and / or only brake dust particle path from the brake chamber to the environment is provided via the first sealing device into the fluid chamber and then via the second sealing device into the environment. Along the brake dust particle path, the brake dust is thus protected from transferring to the environment by the two sealing devices and the cooling fluid in the fluid chamber.

[0020] In a preferred structural embodiment of the invention, the brake drum device comprises a brake drum and a brake drum cover. The brake drum and the brake drum cover form a drum housing for the braking chamber. In particular, the brake drum is cup-shaped, with the braking surface being arranged on the inner circumference of a radially surrounding cup wall of the brake drum. In a radial plane relative to the main axis of rotation, the brake drum has a drum base, in particular a closed one. The brake drum is preferably formed in one piece and / or from a common material section. The brake drum is connected to the connecting shaft in a rotationally fixed manner, in particular to the drum base. The drum housing is rotatably mounted relative to the connecting axis via the drum cover, with the drum housing being closed except for the passage for the connecting axis and thus fluid-tight.This means that brake dust can only escape from the brake chamber via the first sealing arrangement - if at all.

[0021] In a further development or an alternative of the invention, the cooling device comprises a cooling housing with the fluid chamber. The cooling housing is arranged stationary with the connection shaft. Preferably, the cooling housing and the connection shaft are firmly connected to one another and, in particular, are statically fluid-tight. The connection shaft is rotatably mounted relative to the cooling housing and, in particular, within the cooling housing. Except for the passage for the connection shaft, the cooling housing is statically fluid-tight to the outside and / or toward the environment. Statically fluid-tight means, in particular, that no transitions with sections that move relative to one another are provided.

[0022] It is intended that the cooling housing has a fluid supply and a fluid discharge for the cooling fluid.

[0023] In one possible design, the fluid supply and / or fluid discharge are configured as interfaces in the cooling housing. For example, a hose or pipe can be attached to the respective interface and / or are configured as a hose, pipe, or flange.

[0024] In a preferred embodiment of the invention, the connecting shaft has a fluid passage for axially conveying the cooling fluid, wherein the fluid passage is fluidly connected to the fluid chamber. For example, the connecting shaft has an annular gap, wherein the annular gap forms the fluid passage. In this embodiment, the cooling fluid, for example, in the form of oil, in particular transmission oil, can be passed from an adjacent electric axle or an electric motor through the connecting shaft into the fluid chamber.

[0025] A further subject matter of the invention relates to an electric vehicle with the drum brake device as described above. The drum brake device can be arranged close to a driven or non-driven wheel of the electric vehicle. Alternatively, the drum brake device is integrated into the drive train and is preferably arranged upstream of a differential and / or a transmission gear in the direction of torque flow.

[0026] The electric vehicle optionally has a thermal management arrangement, wherein the thermal management arrangement has at least one consumer, wherein the thermal management arrangement is configured to supply the thermal energy from the drum brake device to the consumer. In this embodiment, the dissipated thermal energy is not simply conducted into the environment; rather, an attempt is made to utilize the thermal energy at the consumer to improve the environmental impact and efficiency of the electric vehicle. For example, the consumer can be configured as a heater, a preheater for a transmission and / or an engine, etc.

[0027] Particularly preferably, the electric vehicle has a recuperation device for recuperating electrical energy from the kinetic energy, wherein the thermal management arrangement is configured to adjust the distribution of the absorption of the kinetic energy between the drum brake device and the recuperation device depending on a temperature condition, in particular of the electric vehicle and / or the environment. This is based on the fact that, especially at cold outside temperatures, temporarily storing the kinetic energy as electrical energy and possibly subsequently converting it back into thermal energy at a consumer, e.g., for heating the interior of the electric vehicle, is not energy-efficient.Rather, it is preferred that in this case, the thermal management arrangement directs the kinetic energy to the drum brake device, which converts the kinetic energy into thermal energy, with the converted thermal energy being fed directly to the consumer via the thermal management arrangement. Thus, it is proposed to install a particularly supplementary braking system on the drive train or on a non-drive axle. This braking system supplements the recuperation of the electric motor in driving situations where it cannot or should not absorb the full braking energy. These include, for example, driving situations with low speed / rpm, stopping at a standstill, or braking at low temperatures.

[0028] The advantage of the additional, encapsulated brake is that braking energy can be transferred to the thermal management system as heat (without having to store the energy in the battery in between). Furthermore, brake dust particles are not released into the environment.

[0029] This special arrangement is a drum brake system with a housing around the drum that forms a sealed chamber with the outer surface of the brake drum via two bearings. Cooling fluid is supplied to this chamber as needed. This cooling fluid absorbs heat from the brake drum, which is heated by braking energy, and transfers it to the thermal management system of the electric axle and / or the electric vehicle. The actuation / actuator system, as well as the bearings and torque support of the brake shoes, are routed through the interior of one of the two support bearings.

[0030] The brake drum device provides, in particular, that the rotating brake drum forms a closed brake chamber with the aid of a brake drum cover. The cooling housing, which also has a cover and forms a second closed chamber, the fluid chamber, is located around the brake drum device. Cooling fluid flows through this second closed chamber, which is fed into the chamber via a coolant supply and is then discharged again at a suitable location (preferably at the lowest point of the housing) via a coolant outlet. To prevent coolant from entering the brake drum, the chamber at the transition to the rotating parts is sealed by means of a seal (e.g., grooved sealing rings). The arrangement is supported by two support bearings, which can be located either in the dry or wet chamber.The sealing is then arranged differently accordingly (groove seals to the left of the bearing → grease-lubricated bearings / groove seals to the right of the bearing → oil-lubricated bearings).

[0031] The brake shoes, to which the friction linings are attached, are located inside the brake drum and thus the brake chamber. They are pressed against the inner surface of the brake drum, the braking surface, by means of an actuating unit that acts as the brake actuator. The brake torque support and the hydraulic or electromechanical supply line to the actuating unit are routed into the interior of the brake drum via a cylindrical geometry that serves as a connection axis. This has the advantage of being well sealed.

[0032] The second chamber, the fluid chamber, can be completely flooded with coolant or only partially. An alternative arrangement utilizes the existing cooling volume flow that cools the electric motor, preferably an oil cooler. This flow is directed from the electric motor through the rotating shaft, which serves as the connecting shaft towards the drive, into the brake drum. This drum has cooling channels with an outlet on the outer surface of the brake drum. Centrifugal force directs the coolant into the second enclosed chamber, the fluid chamber. A coolant outlet is located there at a suitable location, from which the coolant is transported to the thermal management system.

[0033] All arrangements have the advantage of using the coolant for thermal management and transferring as much of the heat generated by mechanical friction work as possible to the thermal management.

[0034] Further features, advantages, and effects of the invention will become apparent from the following description of preferred embodiments of the invention and the accompanying figures. These show: Fig. 1 is a schematic representation of a drum brake device as an embodiment of the invention; Fig. 2 the drum brake device in the Fig. 1 with partially graphically suppressed components, but with a fluid supply and a fluid discharge for a cooling fluid; Fig. 3 is a schematic representation of a drum brake device as a further embodiment of the invention; Fig. 4 a schematic block diagram of the electric vehicle with a thermal management arrangement.

[0035] The Fig. 1 shows a schematic longitudinal section along a main axis 100 of a drum brake device 1 for an electric vehicle 2. The electric vehicle 2 is in the Fig. 1 is only shown in a very schematic manner.

[0036] The drum brake device 1 can be arranged, for example, to brake non-driven wheels in the electric vehicle 2. Alternatively, it is connected to the drive train of the electric vehicle 2 via a transmission. In particular, the drum brake device 1 can be arranged behind a differential device and / or a transmission device of the electric vehicle 2, in the opposite direction of the drive torque flow.

[0037] The drum brake device 1 is designed as an end section or as a terminal section, wherein a torque path runs into the drum brake device 1 and ends there in every operating state of the drum brake device 1.

[0038] The drum brake device 1 has a brake drum device 3 and a brake device 4, wherein the brake device 4 is arranged at least partially in the brake drum device 3. The brake device 4 has brake shoes 5, which can be pressed in the radial direction to the main axis 100 against a braking surface 6 of the brake drum device 3. The braking surface 6 is designed as a straight cylindrical surface on the inner circumference of the brake drum device 3. Friction linings 7, which can press against the braking surface 6, are optionally arranged on the brake shoes 5. Alternatively, the friction linings 7 are integrated into the brake shoes 5.

[0039] The braking device 4 has a brake actuator 8, wherein the brake actuator 8 is designed to move the brake shoes 5 for braking in the radial direction relative to the main rotation axis 100. The brake actuator 8 can be designed as a mechanical, electrical and / or magnetic brake actuator 8.

[0040] The braking device 4 is arranged stationary in the electric vehicle 2 via a connecting axle 9. The connecting axle 9 can have any cross-sectional shape, but preferably has a circular cross-section and is implemented as a hollow axle. The connecting axle 9 can actuate the brake actuator 8 or otherwise introduce the braking force into the braking device 4. The braking device 4 thus forms a stationary braking partner of the drum brake device 1.

[0041] The brake drum device 3 is rotationally fixedly connected to a connecting shaft 10. As already described, the connecting shaft 10 can be operatively connected to the drive train and / or driven or non-driven wheels of the electric vehicle 2. Thus, the brake drum device 3 forms a rotating partner of the drum brake device 1.

[0042] The brake drum device 3 has a brake drum 11 and a brake drum cover 12. The brake drum 11 is designed as a pot, which, in the longitudinal section shown, has a horizontal U-shaped form. The braking surface 6 is arranged on the inner circumference of a circumferential radial wall 13a of the brake drum 11. The radial wall is integrally connected to a drum base 13b. The connecting shaft 10 is integrally formed on the drum base 13b. The brake drum cover 12 closes off a braking chamber 14 from the brake drum 11, with the brake drum 11 and brake drum cover 12 forming a drum housing for the braking chamber 14.

[0043] Preferably, the drum base 13b is designed to be closed. The brake chamber 14 is, in particular, only open through an inner axle through-hole 15 for the passage of the connecting axle 9.

[0044] The drum brake device 1 has a cooling device 16, wherein the cooling device 16 is designed to transport the thermal energy converted into thermal energy during a braking operation in the drum brake device 1 via a cooling fluid. The cooling device 16 is formed by a cooling housing 17, wherein a fluid chamber 18 for the cooling fluid is arranged in the cooling housing 17.

[0045] The cooling device 17 has a cooling pot 19 and a cooling cover 20, which together form the cooling housing 18. The cooling pot 19 can be circular in cross-section; at least preferably, the fluid chamber 18 is circular and arranged coaxially and / or concentrically to the brake drum device 3. The cooling pot 19 is closed off by the cooling cover 20, wherein the cooling cover 20 extends in a radial plane to the main axis of rotation 100. The cooling housing 17 has a shaft through-opening 21 for the connecting shaft 10. Furthermore, the cooling housing 17 has an outer axis through-opening 22 for the connecting axis 9. The connecting axis 9 and the connecting shaft 10 are arranged coaxially in this exemplary embodiment.

[0046] The connecting shaft 10 is mounted relative to the cooling housing 17 via a first bearing device 23. The brake drum device 3 is mounted relative to the connecting shaft 9 via a second bearing device 24.

[0047] A first sealing device 25 is arranged between the cooling housing 17 and the connecting shaft 10, with the connecting shaft 9 forming a first sealing partner and the cooling housing 17 forming a second sealing partner. A second sealing device 26 is arranged between the brake drum device 3 and the connecting shaft 9, with the brake drum device 3 forming a first sealing partner and the connecting shaft 9 forming a second sealing partner. The first sealing device 25 seals the fluid chamber 18 in a fluid-tight manner from the surroundings 101, so that the cooling fluid from the fluid chamber 18 cannot pass through the shaft passage opening 21.

[0048] While the bearing devices 23, 24 are each arranged on a dry side and the sealing devices 25, 26 are each arranged on a fluid side, these can also be swapped in position or bearing devices with integrated sealing devices could also be used.

[0049] With the second sealing arrangement 26, the brake chamber 14 is fluid-tightly separated from the fluid chamber 18, so that no cooling fluid can pass from the fluid chamber 18 into the brake chamber 14. The brake chamber 14 is designed as a dry brake chamber, in which, in particular, no cooling fluid is present. Although the connecting shaft 10 is designed as a hollow shaft, it is preferred that it be fluidically closed, so that the brake chamber 14 is also fluidically sealed in the direction of the connecting shaft 10.

[0050] Thus, the brake chamber 14 is arranged in the fluid chamber 18, so that, firstly, no brake dust can escape from the brake chamber 14 via the second sealing arrangement 26. Secondly, any brake dust could only enter the fluid chamber 18 upon overcoming the second sealing device 26, so that the brake dust would be immediately bound by the cooling fluid. Even in the event that the cooling fluid could not bind the brake dust, a further barrier would be created by the first sealing device 25. A possible brake dust path would thus run from the brake chamber 14, in which the brake dust is generated by the braking process, via the second sealing device 26 as a first barrier, via the fluid chamber 18 as a second barrier, and subsequently via the first sealing device 25 as a third barrier, so that the escape of brake dust from the drum brake device 1 into the environment 101 is practically impossible.

[0051] The Fig. 2 shows the drum brake device 1 in the Fig. 1 with some of the components of the brake drum device 3 suppressed graphically. In contrast, a fluid supply 27 is shown, which transports the cooling fluid into the fluid chamber 18, as well as a fluid discharge 28 is shown, which can transport the cooling fluid out of the fluid chamber 18. The fluid supply 27 and the fluid discharge 28 are each designed as interfaces for pipes, channels, etc. The fluid supply 27 is located in an upper partial region of the drum brake device 1, while the fluid discharge 28 is located in a bottom region, so that the cooling fluid can be guided through the drum brake device 1 and in particular through the cooling device 16 or the fluid chamber 18 under the control of gravity.

[0052] The Fig. 3 shows a second embodiment of the invention as a drum brake device 1, wherein the same reference numerals refer to the same parts or sections and only the differences are discussed below.

[0053] In this exemplary embodiment, the fluid supply 27 is designed differently. The fluid supply 27 is integrated into the connecting shaft 10, which has an annular channel 29 running in the axial direction as the fluid supply 27. The fluid supply 27 merges into a double-walled region 30 of the brake drum 11, which forms a cooling jacket for the brake drum 11. Openings are provided on the outer circumference and / or on the radial outside so that the cooling fluid can leave the brake drum 11 and enter the fluid chamber 18.

[0054] The fluid removal can be achieved through the fluid discharge 28, as already described in the Fig. 2 described above.

[0055] The Fig.4 shows a schematic block diagram of the electric vehicle 2, wherein the electric vehicle 2 has the drum brake device 1 as previously described. Furthermore, the electric vehicle 2 has a thermal management arrangement 31, wherein the thermal management arrangement 31 is designed as a control device for energy management. The electric vehicle 2 further has a recuperation device 32 for recuperating kinetic energy into electrical energy, which can be stored in a battery 33. The battery 33 can be designed to supply the electric vehicle 2 with electrical energy for propulsion. Furthermore, the electric vehicle 2 comprises at least one utility consumer 34, wherein the utility consumer 34 is designed as a heat source, for example for the interior as an interior heater, a window heater, or the like.The electric vehicle 2 has a sensor system 35, which is designed, for example, as an outside temperature sensor or as an inside temperature sensor. During operation of the vehicle 2, kinetic energy of the vehicle 2 must be dissipated in braking situations. The kinetic energy is distributed via the thermal management arrangement 31. For distribution, the thermal management arrangement 31 takes into account an outside temperature and / or an inside temperature. In the event that one or both temperatures are low, for example, below 0°, kinetic energy is allocated to the drum brake device 1, so that it is provided by converting the kinetic energy into thermal energy. This thermal energy is made available directly to the consumer 34.

[0056] In the event that temperatures are comparatively high, for example 20°C or higher, the kinetic energy is provided to the recuperation device 32, which converts it into electrical energy and stores it back in the battery 33. If necessary, the electrical energy can be used to supply the consumer 34. However, it is clear from the block diagram that with the energy path via the recuperation device 32, the energy must be converted twice: once from kinetic energy to electrical energy and subsequently from electrical energy to thermal energy. In contrast, with the energy path via the drum brake device 1, the kinetic energy only needs to be converted once into thermal energy, which can then be provided directly to the consumer 34. The thermal management arrangement 31 thus succeeds in implementing more efficient energy management for the electric vehicle 2. List of reference symbols 1 drum brake device 2 electric vehicles 3 Brake drum device 4 Braking device 5 brake shoes 6 braking surface 7 Friction lining 8 Brake actuator 9 Connection axis 10 connection shaft 11 Brake drum 12 brake drum covers 13a Radial wall 13b Drum base 14 Brake chamber 15 inner axle passage opening 16 Cooling device 17 Cooling housing 18 Fluid chamber 19 Cooling pot 20 cooling lids 21 Shaft passage opening 22 outer axle passage opening 23 first storage facility 24 second storage facility 25 first sealing device 26 second sealing device 27 Fluid supply 28 Fluid drainage 29 Ring Canal 30 double wall area 31 Thermal management arrangement 32 Recuperation device 33 Battery 34 consumers 35 Sensor technology 100 Main axis of rotation 101 Surroundings

Claims

[1] Drum brake device (1) for an electric vehicle (2), with a brake drum device (3), wherein the brake drum device (3) forms a brake chamber (14), and with a braking device (4), wherein the braking device (4) has brake shoes (5) and wherein the braking device (4) is designed and / or arranged to press the brake shoes (5) against an inner circumference of the brake drum (11) in the braking chamber (14) in order to generate a braking torque and to convert kinetic energy into thermal energy, with a cooling device (16) for removing the heat energy via a cooling fluid, wherein the cooling device (16) forms a fluid chamber (18), wherein the cooling fluid is arranged in the fluid chamber (18) and wherein the brake drum device (3) is arranged in the fluid chamber (18), so that the brake chamber (14) is arranged in the fluid chamber (18) and is thereby arranged in a fluid-tight and / or dust-tight manner with respect to an environment (101), characterized by a connection axis (9) for connecting the brake device (4) to a stationary brake partner, wherein the brake drum device (3) is mounted relative to the connection axis (9) and is sealed fluid-tight via a first sealing device (25), wherein the brake drum device (3) forms a first sealing partner and the connection axis (9) forms a second sealing partner, so that the brake chamber (14) is sealed fluid-tight and thus also dust-tight from the fluid chamber (18) by the first sealing device (25), and characterized bya connecting shaft (10) for connecting the brake drum device (3) to a rotating brake partner, wherein the connecting shaft (10) is mounted relative to the cooling device (16) and is sealed in a fluid-tight manner via a second sealing device (26), wherein the cooling device (16) forms a first sealing partner and the connecting shaft (10) forms a second sealing partner, so that the fluid space (18) is sealed in a fluid-tight manner from the environment (101) by the second sealing device (26). [2] Drum brake device (1) according to claim 1, characterized by that the drum brake device (1) is designed as a dry brake device. [3] Drum brake device (1) according to one of the preceding claims, characterized bythat a theoretical brake dust path into the environment (101) leads from the brake chamber (14) via the first sealing device (25) into the fluid chamber (18) and subsequently via the second sealing device (26) into the environment. [4] Drum brake device (1) according to one of the preceding claims 1 to 3, characterized by in that the brake drum device (3) has a brake drum (11) and a brake drum cover (12), wherein the brake drum (11) and the brake drum cover (12) form a drum housing for the brake chamber (14), wherein the brake drum (11) is connected to the connecting shaft (10) in a rotationally fixed manner, wherein the drum housing is rotatably mounted relative to the connecting axis (9) via the brake drum cover (12), and wherein the drum housing is designed to be statically fluid-tight except for the passage for the connecting axis (9). [5] Drum brake device (1) according to one of the preceding claims 1 to 4, characterized byin that the cooling device (16) forms a cooling housing (17) with the fluid space (18), wherein the cooling housing (17) is arranged stationary with the connection axis (9) and wherein the connection shaft (10) is rotatably mounted relative to the cooling housing (17), wherein the cooling housing (17) is designed to be statically fluid-tight in the direction of the environment (101) except for the passage for the connection shaft (9). [6] Drum brake device according to one of the preceding claims, characterized by that the cooling device (16) with a or the cooling housing (17) has a fluid supply (27) and a fluid discharge (28), wherein the fluid supply (27) and / or the fluid discharge (28) are designed as interfaces in the cooling device (16) and / or in the cooling housing (17). [7] Drum brake device according to one of claims 1 to 6, characterized bythat the connecting shaft (10) has a fluid passage for passing the cooling fluid, wherein the fluid passage is fluidly connected to the fluid space (18). [8] Electric vehicle (2) characterized by the drum brake device (1) according to one of the preceding claims, with a consumer (34) and with a thermal management arrangement (31), wherein the thermal management arrangement (31) is designed to supply the kinetic energy of the drum brake device (1) for supplying the consumer (34) with thermal energy.

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