Wheel-specific brake unit, brake system for a vehicle comprising such a brake unit, and method for mounting such a brake unit on a vehicle

Abstract

The present invention relates to a wheel individual brake unit (10, 10') for a vehicle, comprising a single wheel brake cylinder (12), a motorized piston-cylinder arrangement (14) having an electric motor (16) and at least one piston (18) displaceable by operation of the electric motor (16), and at least one hydraulic line (22) via which the wheel brake cylinder (12) is hydraulically connected to the motorized piston-cylinder arrangement (14) in such a way that brake fluid can be transferred between the motorized piston-cylinder arrangement (14) and the wheel brake cylinder (12) by the displaced at least one piston (18) of the motorized piston-cylinder arrangement (14). The present invention also relates to a brake system for a vehicle. Furthermore, the present invention relates to a method for mounting the wheel individual brake unit (10, 10').

Description

[Technical Field]

[0001] The present invention relates to a wheel-individual brake unit for a vehicle, to a brake system for a vehicle, and to a method for mounting a wheel-individual brake unit. [Background technology]

[0002] Electromechanical braking systems for motor vehicles are known from the prior art, for example from DE 10 200 04 13 56 A1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] German Patent Application Publication No. 102019219002 Summary of the Invention

[0004] The present invention provides a wheel-individual brake unit for a vehicle having the features of claim 1, a brake system for a vehicle having the features of claim 8, and a method for mounting a wheel-individual brake unit having the features of claim 11. [Effects of the Invention]

[0005] The present invention provides a wheel-specific brake unit or a brake system equipped with this wheel-specific brake unit, which has a lower-cost design and can be more easily installed on a vehicle / automobile wheel compared to conventional electromechanical brake systems. Because the wheel-specific brake unit of the present invention is equipped with at least one hydraulic line, it is not necessary to directly install a motorized piston-cylinder device, particularly its electric motor, on each wheel. The formation of the wheel-specific brake unit of the present invention thereby ensures greater flexibility in installing the motorized piston-cylinder device, particularly its electric motor, while ensuring that the motorized piston-cylinder device / electric motor is protected from environmental influences, such as impacts, splashes of water, and high-temperature brake discs. The wheel-specific brake unit of the present invention, or a brake system formed with this wheel-specific brake unit, therefore, has an increased service life and requires less frequent repairs compared to conventional electromechanical brake systems.

[0006] In one advantageous embodiment of the wheel-specific brake unit, the maximum storage volume of the motorized piston-cylinder device is 8 cm 3 The maximum volume to be accommodated is to be understood as the maximum volume of brake fluid that can be sucked into at least one internal volume of a motorized piston-cylinder device defined by at least one displaceable piston. Maximum 8 cm 3 Due to the relatively small maximum volume of the motorized piston-cylinder arrangement, the embodiments of the wheel-individual brake units described herein can be manufactured relatively inexpensively and relatively easily assembled to the respective vehicle.

[0007] Alternatively or additionally, the maximum travel stroke of the at least one piston displaceable by operation of the electric motor of the motorized piston-cylinder device may each be 80 mm or less. This facilitates the miniaturization of the motorized piston-cylinder device or of the wheel individual brake unit embodiments described herein. Furthermore, limiting the maximum travel stroke of the at least one displaceable piston of the motorized piston-cylinder device to a maximum of 80 mm reduces the requirements for an electric motor suitable for operating the motorized piston-cylinder device. This also contributes to reducing the manufacturing costs of the wheel individual brake unit.

[0008] In another advantageous embodiment, the wheel-specific brake unit comprises a printed circuit board that is designed and / or programmed to control the operation of an electric motor that is arranged on and / or on the printed circuit board. Due to the fact that the wheel-specific brake unit is equipped with at least one hydraulic line, the printed circuit board can also be installed in a relatively well-protected position on vehicles equipped with the respective wheel-specific brake unit embodiments described herein.

[0009] In an advantageous development, the wheel-specific brake units can also have wheel inlet valves arranged in at least one hydraulic line in such a way that, in their closed state, the wheel inlet valves prevent the transfer of brake fluid from the motorized piston-cylinder device into the wheel brake cylinders, and the brake pressure buildup in the wheel brake cylinders can in this case also be controlled by the wheel inlet valves.

[0010] Alternatively or additionally, the wheel individual brake units may include a brake fluid reservoir, and the motorized piston-cylinder device may be hydraulically connected to the brake fluid reservoir such that brake fluid can be drawn from the brake fluid reservoir into the motorized piston-cylinder device. The brake fluid reservoir may thereby be used to "sniff" brake fluid into the motorized piston-cylinder device.

[0011] The wheel individual brake unit may also comprise a wheel outlet valve arranged in the at least one return line such that, in its closed state, the wheel outlet valve prevents transfer of brake fluid from the wheel brake cylinder through the at least one return line into the brake fluid reservoir, whereby switching of the wheel outlet valve can unlock a wheel braked by the wheel brake cylinder of the described embodiment of the wheel individual brake unit.

[0012] A braking system for a vehicle with at least one individual wheel brake unit also ensures the aforementioned advantages. The braking system can be, in particular, a distributed braking system, in which each wheel of the vehicle is equipped with one individual wheel brake unit, in which case each wheel of the vehicle can be braked individually by pressure actuation in wheel brake cylinders arranged on the wheel.

[0013] In an advantageous embodiment of the brake system, the control device, to which at least one wheel individual brake unit is electrically connected, is designed and / or programmed to output at least one control signal to a respective electric motor or a respective printed circuit board of at least one wheel individual brake unit, taking into account at least one brake request signal provided to the control device by at least one brake operating element sensor and / or at least one automatic vehicle speed control device, so that pressure application in each wheel brake cylinder of at least one wheel individual brake unit can be performed in response to an actuation of a brake operating element by the respective vehicle driver, detected by the at least one brake operating element sensor, or in response to the automatic vehicle speed control device.

[0014] Preferably, the brake system comprises a plurality of wheel-specific brake units, each of which is hydraulically decoupled from the other wheel-specific brake units. The fact that the wheel-specific brake units are hydraulically decoupled from one another can be understood as meaning that the wheel-specific brake units are connected to one another at most via their electrical connection to the control device of the brake system and / or via at least one signal line and / or bus line. The fact that the wheel-specific brake units are hydraulically decoupled from one another ensures that, even if one wheel-specific brake unit has a leak, the other wheel-specific brake units of the brake system are still fully functional.

[0015] Furthermore, a method for mounting wheel-specific brake units on a vehicle is also advantageous, during which the following steps are performed: mounting the wheel brake cylinders of the wheel-specific brake units on the wheels of the vehicle, and mounting the motorized piston-cylinder devices of the wheel-specific brake units on the vehicle in a cushioned area relative to the wheels. Mounting the wheel-specific brake units on the respective vehicle, which is achieved by implementing the method described here, ensures in particular that the motorized piston-cylinder devices are protected from mechanical shocks, splashing water and high-temperature brake discs.

[0016] Further features and advantages of the invention will be explained subsequently with reference to the drawings. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic diagram of a first embodiment of a wheel-specific brake unit or of a brake system equipped with such a wheel-specific brake unit; [Figure 2] 2 is a schematic diagram of a second embodiment of a wheel-specific brake unit or of a brake system equipped with such a wheel-specific brake unit; [Figure 3] 3 is a schematic diagram of a third embodiment of a wheel-specific brake unit or of a brake system equipped with such a wheel-specific brake unit. [Figure 4] 1 is a flow chart illustrating one embodiment of a method for installing wheel-specific brake units on a vehicle. DETAILED DESCRIPTION OF THE INVENTION

[0018] FIG. 1 shows a schematic diagram of a first embodiment of a wheel-specific brake unit or of a brake system equipped with such a wheel-specific brake unit.

[0019] The wheel-specific brake unit 10 shown diagrammatically in Fig. 1, or a brake system equipped with this wheel-specific brake unit 10, can be / is fitted to a vehicle / automobile. It should be explicitly noted that the applicability of this wheel-specific brake unit 10 is not limited to a particular vehicle / automobile type. In particular, the applicability of this wheel-specific brake unit 10 is not limited to a specific number of wheels on a vehicle / automobile. A brake system realized with at least one wheel-specific brake unit 10 can also be easily adapted to vehicle / automobile types with a different number of wheels.

[0020] Each wheel-specific brake unit 10 includes a single wheel brake cylinder 12 that can be mounted on one wheel of a respective vehicle / automobile. The wheel having the wheel brake cylinder 12 mounted thereon can be a front wheel, a rear wheel, or another wheel disposed between at least one front wheel and at least one rear wheel of the vehicle / automobile. The wheel-specific brake unit 10 further includes a motorized piston-cylinder device 14 having an electric motor 16 and at least one piston 18 that can be displaced by operation of the electric motor 16. The motorized piston-cylinder device 14 may also be referred to as a plunger device. Preferably, the electric motor 16 is coupled to the at least one displaceable piston 18 via a thread device 20 of the motorized piston-cylinder device 14 such that the at least one piston 18 can be linearly displaced within at least one internal volume of the motorized piston-cylinder device 14 by operation of the electric motor 16. The thread device 20 may, for example, have a planetary transmission and / or a spindle, in particular a recirculating ball spindle. However, it should be noted that the configuration possibilities of the motorized piston-cylinder device 14 are not limited to a particular thread type.

[0021] The wheel brake cylinders 12 are hydraulically connected to the motorized piston-cylinder arrangement 14 via at least one hydraulic line 22 in such a way that brake fluid can be transferred between at least one internal volume of the motorized piston-cylinder arrangement 14 and the wheel brake cylinders 12 by means of at least one displaceable piston 18 of the motorized piston-cylinder arrangement 14. By operating the electric motor 16 of the motorized piston-cylinder arrangement 14, the brake pressure in the wheel brake cylinders 12 can be adjusted wheel-individually. In this way, the braking force exerted on the wheels equipped with the wheel brake cylinders 12 can be selected wheel-individually.

[0022] The at least one hydraulic line 22, which transfers brake fluid between the at least one internal volume of the motorized piston-cylinder arrangement 14 and the wheel brake cylinder 12, can be relatively short. Nevertheless, the fact that the wheel-individual brake unit 10 is equipped with the at least one hydraulic line 22 makes it possible to arrange the motorized piston-cylinder arrangement 14 at a distance from the wheel brake cylinder 12. While the wheel brake cylinder 12 is / is mounted directly on the wheel of the vehicle / motor vehicle that is braked by this wheel brake cylinder 12, the motorized piston-cylinder arrangement 14 is / can nevertheless be arranged in a position on the vehicle / motor vehicle where it is protected from environmental influences, such as impacts, splashes of water and hot brake discs on the wheel. The fact that each wheel-specific brake unit 10 is equipped with at least one hydraulic line 22 therefore allows for increased flexibility when mounting the motorized piston-cylinder device 14 on a vehicle / automobile and improved protection of the mounted motorized piston-cylinder device 14 from environmental influences.

[0023] It should be explicitly stated that there is no additional second wheel brake cylinder hydraulically connected to this motorized piston-cylinder arrangement 14. If the brake system, which will be described in more detail below, comprises, in addition to the wheel brake cylinder 12 of the wheel individual brake unit 10 described here, at least one other wheel brake cylinder of at least one other wheel individual brake unit 10', this at least one other wheel brake cylinder is hydraulically decoupled from the motorized piston-cylinder arrangement 14 of the wheel individual brake unit 10 described here. By the motorized piston-cylinder arrangement 14 being hydraulically decoupled from the at least one other wheel brake cylinder, it should be understood that there is no hydraulic line extending between this motorized piston-cylinder arrangement 14 and this at least one other wheel brake cylinder.

[0024] The electric motor 16 of the motorized piston-cylinder unit 14 can be driven by a printed circuit board (PCB) 24, which is designed and / or programmed accordingly. The electric motor 16 can be arranged on and / or on the printed circuit board 24. Preferably, the power stage (electronic driver module) of the electric motor 16, for example, the B6 driver bridge of the electric motor 16, is integrated into the printed circuit board 24. Optionally, the electric motor 16 can further be equipped with a motor current sensor 26 and / or a rotor position or angular velocity sensor 28. In this case, the motor current sensor 26 and / or the rotor position or angular velocity sensor 28 of the electric motor 16 can be read out by the printed circuit board 24. For example, a magnet wheel of the rotor position or angular velocity sensor 28 can be attached to the shaft of the electric motor 16, and the position of the magnet wheel, and thus the rotor position or angular velocity of the electric motor 16, can be determined by a specialized circuit provided on the printed circuit board 24. The pressure signal of a pressure sensor 30 hydraulically connected to the at least one hydraulic line 22 can also be evaluated by the printed circuit board 24. The printed circuit board 24 may be part of an electronic control unit (ECU) 32 attached to the electric motor 16.

[0025] Optionally, the wheel-specific brake units 10 may include a brake fluid reservoir 34. In this case, the motorized piston-cylinder device 14 may be hydraulically connected to the brake fluid reservoir 34 so that brake fluid can be sucked / "sniffed" from the brake fluid reservoir 34 into the motorized piston-cylinder device 14. The brake fluid reservoir 34 may be formed with a relatively small volume, since the volume stored in the brake fluid reservoir 34 is only required for pressure buildup in a single wheel brake cylinder 12. Preferably, the motorized piston-cylinder device 14 is hydraulically connected to the brake fluid reservoir 34 via a positive pressure valve 36 so that brake fluid flows from the brake fluid reservoir through the positive pressure valve 36 into at least one internal volume of the motorized piston-cylinder device 14 only when there is a "shortage" of volume in the motorized piston-cylinder device 14. It should also be noted here that the wheel-specific brake units 10 may often be omitted from being equipped with brake fluid reservoirs 34 and possibly also with positive pressure valves 36 .

[0026] In the embodiment of Fig. 1, the wheel individual brake unit 10 is part of a brake system for the respective vehicle / automobile. In addition to the wheel individual brake unit 10, the brake system may further comprise at least one further wheel individual brake unit 10', which is configured similarly to the aforementioned wheel individual brake unit 10. The formation of a brake system with exactly four wheel individual brake units 10 and 10' for a vehicle having exactly four wheels, as symbolically shown in Fig. 1, should be taken as exemplary only.

[0027] The braking system also includes a control device 38, to which at least one individual wheel brake unit 10, 10' is electrically connected. The control device 38 is designed and / or programmed to output at least one control signal to the electric motor 16 or the printed circuit board 24 of each of the at least one individual wheel brake unit 10, 10'. For this purpose, the control device 38 can be connected to the at least one individual wheel brake unit 10, 10' via at least one signal line and / or bus line 40, respectively. Since the at least one signal line and / or bus line 40 is easier to install than hydraulic lines, the electrical connection of the at least one individual wheel brake unit 10, 10' to the control device 38 does not require significant installation work. The output of the at least one control signal is preferably performed taking into account at least one brake request signal 42 provided to the control device 38. The at least one brake request signal 42 can be selectively provided to the control device 38 from at least one brake operating element sensor or from at least one automatic vehicle speed control device. The at least one brake operating element sensor is understood to be a sensor type capable of detecting the operation of a brake operating element of the vehicle / automobile, such as a brake pedal. The at least one brake operating element sensor may be, for example, a rod stroke sensor and / or a differential stroke sensor. The at least one automatic vehicle speed control device is designed for autonomous / automatic control of the speed of the vehicle / automobile. The at least one automatic vehicle speed control device may be, for example, a driver assistance system, such as an adaptive cruise control (ACC) and / or an emergency braking system.

[0028] If the brake system includes a plurality of wheel-specific brake units 10 and 10', each of these wheel-specific brake units 10 and 10' is hydraulically decoupled from at least one other wheel-specific brake unit 10 and 10'. This means that the wheel-specific brake units 10 and 10' are connected to one another at most via their signal and / or bus lines 40, the control device 38, and / or at least one other signal and / or bus line (not shown). In particular, no hydraulic lines extend from one of the wheel-specific brake units 10 and 10' to at least one other wheel-specific brake unit 10 and 10'. Because the wheel-specific brake units 10 and 10' are hydraulically decoupled, the hydraulic lines between the wheels braked by the wheel-specific brake units 10 and 10', which would conventionally be required in the brake system of FIG. 1, are omitted. This results in a brake system with a very compact and space-saving design. In particular, the modular construction of the brake system allows for relatively low manufacturing costs: the wheel-specific brake units 10 and 10' can also be mounted on the vehicle as separate units, which also facilitates the mounting of the brake system described herein.

[0029] FIG. 2 shows a schematic diagram of a second embodiment of a wheel-specific brake unit or of a brake system equipped with such a wheel-specific brake unit.

[0030] Unlike the previous embodiments, in the brake system of Fig. 2, the power stage (Electronic Driver Module) of each electric motor 16 of the at least one wheel individual brake unit 10 and 10', in particular at least one B6 driver bridge of each electric motor 16 of the at least one wheel individual brake unit 10 and 10', is integrated into the electronic circuitry of the brake system control device 38. This facilitates miniaturization of the at least one wheel individual brake unit 10 and 10' of the brake system. A relatively low current sufficient to operate each electric motor 16 of the at least one wheel individual brake unit 10 and 10' can be provided from the control device 38 to each electric motor 16 or its printed circuit board 24.

[0031] For further features and characteristics of the embodiment of FIG. 2 and its advantages, please refer to the above description of FIG.

[0032] FIG. 3 shows a schematic diagram of a third embodiment of a wheel-specific brake unit or of a brake system equipped with such a wheel-specific brake unit.

[0033] The wheel-specific brake unit 10 shown diagrammatically in Figure 3, as a further development of the embodiment of Figure 1, further comprises a wheel inlet valve 44 and a wheel outlet valve 46. The wheel inlet valve 44 is arranged in the at least one hydraulic line 22 in such a way that in its closed state, the wheel inlet valve 44 prevents the transfer of brake fluid from the motorized piston-cylinder arrangement 14 into the wheel brake cylinder 12. The brake pressure in the wheel brake cylinder 12 can thus also be adjusted to a desired value by switching the wheel inlet valve 44.

[0034] The wheel outlet valves 46 are arranged in at least one return line 48 of the wheel-individual brake units 10, via which the wheel brake cylinders 12 are hydraulically connected to the brake fluid reservoir 34. The positions of the wheel outlet valves 46 are selected in this case such that the wheel outlet valves 46 in their closed state prevent the transfer of brake fluid from the wheel brake cylinders 12 into the brake fluid reservoir 34 via the at least one return line 48. If a wheel of the vehicle / automobile that is braked by the wheel brake cylinders 12 is locked, a brief opening of the wheel outlet valves 46 can trigger the transfer of brake fluid from the wheel brake cylinders 12 into the brake fluid reservoir 34 via the at least one return line 48, so that the wheel can be unlocked.

[0035] For further features and advantages of the embodiment of FIG. 3, please refer to the description of FIG.

[0036] All of the above-described embodiments of the wheel individual brake units 10 and 10' can be equipped with a relatively small, low-cost and space-saving motorized piston-cylinder device 14. The maximum storage volume of each motorized piston-cylinder device 14 is 8 cm. 3 (cubic centimeters) or less, preferably 5 cm 3 (cubic centimeter) or less, especially 3 cm 3(cubic centimeters) or less. The maximum travel stroke of the at least one piston 18 of the motorized piston-cylinder device 14, displaceable by operation of the electric motor 16, may also be 80 mm (millimeters) or less, preferably 60 mm (millimeters) or less, in particular 40 mm (millimeters) or less. Such a "small" design of the motorized piston-cylinder device 14 is possible because its volume is only required for the wheel brake cylinder 12 of a single wheel. If the maximum storage volume of the motorized piston-cylinder device 14 mentioned here is 8 cm 3 (cubic centimeters) or less, and the maximum travel stroke of at least one piston 18 of the motorized piston-cylinder device 14 is 80 mm (millimeters) or less, the braking force exerted by the wheel brake cylinder 12 on the assigned wheel can be 20 kN (kilonewtons) or more.

[0037] The possibility of making the motorized piston-cylinder device 14 relatively "small" also allows the use of a relatively small and relatively low-cost electric motor 16. The maximum torque that can be generated by the electric motor 16 can therefore be 2 Nm (Newton meters) or less, for example 1.5 Nm (Newton meters) or less, in particular 1 Nm (Newton meters) or less. The electric motor 16 can alternatively be a DC motor or an EC motor. Relatively low-cost materials, such as plastic, can also be used for the thread device 20.

[0038] Additionally, all of the above-described wheel individual brake units 10 and 10' have a simple design and are therefore inexpensive to manufacture and easily miniaturized. Furthermore, all of the above-described wheel individual brake units 10 and 10', or brake systems equipped with these wheel individual brake units 10 and 10', can be installed in a vehicle / automobile with relatively little effort.

[0039] FIG. 4 shows a flow chart illustrating one embodiment of a method for installing wheel-specific brake units on a vehicle.

[0040] It should be explicitly stated that the applicability of the method described below is not limited to a particular vehicle type / automobile type of vehicle / automobile fitted with wheel-specific brake units.

[0041] All the above-mentioned wheel individual brake units can be mounted on the respective vehicle by the method described below, but the feasibility of the method is not limited to mounting one of the above-described embodiments of the wheel individual brake unit on the respective vehicle.

[0042] In method step S1, the wheel brake cylinders of the wheel-specific brake units are mounted on the wheels of the vehicle. Method step S1 can be performed in such a way that, after the wheel-specific brake units have been mounted, the wheels can be braked by generating brake pressure in the wheel brake cylinders mounted thereon.

[0043] Before, after or simultaneously with method step S1, method step S2 is also performed. In method step S2, the motorized piston-cylinder device of the (same) wheel-specific brake unit is mounted in a damped area of ​​the vehicle relative to the wheel. This ensures that the motorized piston-cylinder device is protected from environmental influences, such as impacts, splash water and high-temperature brake discs of the wheel, during operation of the wheel-specific brake unit. Preferably, the motorized piston-cylinder device is mounted on a damped mass (sprung mass).

[0044] After the wheel-specific brake unit is mounted according to method steps S1 and S2, there is little risk of damage to the motorized piston-cylinder device during operation of the wheel-specific brake unit. Therefore, repair costs for the wheel-specific brake unit mounted according to method steps S1 and S2 are also minimal. The method described here can also be carried out with relatively little effort. [Explanation of symbols]

[0045] 10 Wheel-specific brake units 10' Separate wheel individual brake unit 12 Wheel brake cylinder 14 Piston-cylinder device 16 Electric motor 18 Piston 20 Thread device 22 Hydraulic pipeline 24 Printed Circuit Board (PCB) 26 Motor current sensor 28 Rotor position sensor or angular velocity sensor 30 Pressure Sensor 32 Electrical Control Unit (ECU) 34 Brake fluid reservoir 36 Positive pressure valve 38 Control Device 40 Signal and / or bus lines 42 Brake request signal 44 Wheel inlet valve 46 Wheel outlet valve 48 Return pipe S1 Method Step S2 Method Step

Claims

1. A wheel-specific brake unit (10, 10') for a vehicle, comprising: A single wheel brake cylinder (12); A motorized piston-cylinder device (14) having an electric motor (16) and at least one piston (18) displaceable by operation of the electric motor (16); at least one hydraulic line (22) hydraulically connected to the motorized piston-cylinder arrangement (14) via said hydraulic line (22) such that brake fluid can be transferred between the motorized piston-cylinder arrangement (14) and the wheel brake cylinder (12) by means of at least one displaced piston (18) of the motorized piston-cylinder arrangement (14); A wheel-specific brake unit (10, 10') for a vehicle.

2. The maximum capacity of the motorized piston-cylinder device (14) is 8 cm ３ A wheel-specific brake unit (10, 10') according to claim 1, wherein:

3. 3. A wheel-specific brake unit (10, 10') according to claim 1 or 2, wherein the maximum travel stroke of at least one of the pistons (18) of the motorized piston-cylinder device (14), which can be displaced by operation of the electric motor (16), is respectively less than or equal to 80 mm.

4. 10. The wheel individual brake unit (10, 10') according to any one of the preceding claims, comprising a printed circuit board (24) designed and / or programmed to operatively control the operation of the electric motor (16) arranged in contact with and / or on the printed circuit board (24).

5. The wheel individual brake unit (10, 10') according to any one of the preceding claims, further comprising a wheel inlet valve (44) arranged in at least one of the hydraulic lines (22) such that, in its closed state, the wheel inlet valve (44) prevents the transfer of brake fluid from the motorized piston-cylinder device (14) into the wheel brake cylinder (12).

6. 13. A wheel individual brake unit (10, 10') according to any one of the preceding claims, wherein the wheel individual brake unit (10, 10') comprises a brake fluid reservoir (34) and the motorized piston-cylinder device (14) is hydraulically connected to the brake fluid reservoir (34) such that brake fluid can be sucked from the brake fluid reservoir (34) into the motorized piston-cylinder device (14).

7. 7. The wheel individual brake unit (10, 10') according to claim 6, further comprising a wheel outlet valve (46) arranged in at least one return line (48) such that, in its closed state, the wheel outlet valve (46) prevents the transfer of brake liquid from the wheel brake cylinder (12) through at least one return line (48) into the brake liquid reservoir (34).

8. A braking system for a vehicle comprising at least one wheel individual brake unit (10, 10') according to any one of the preceding claims.

9. 9. A brake system according to claim 8, wherein a control device (38), to which at least one said wheel individual brake unit (10, 10') is electrically connected, is designed and / or programmed to output at least one control signal to the respective electric motor (16) or to the respective printed circuit board (24) of the at least one said wheel individual brake unit (10, 10') under consideration of at least one brake request signal (42) provided to said control device (38) from at least one brake operating element sensor and / or at least one automatic vehicle speed control device.

10. 10. The brake system according to claim 8 or 9, comprising a plurality of wheel-specific brake units (10, 10'), each of which is hydraulically decoupled from at least one other wheel-specific brake unit (10, 10').

11. A method for mounting an individual wheel brake unit (10, 10') according to any one of claims 1 to 7 on a vehicle, comprising the following steps: mounting the wheel brake cylinders (12) of the wheel individual brake units (10, 10') on the wheels of the vehicle; mounting said motorized piston-cylinder device (14) of said wheel-specific brake unit (10, 10') on said vehicle in a cushioned area with respect to said wheel; A method for mounting a wheel-specific brake unit (10, 10') on a vehicle, comprising:

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