Braking device for a hydraulic motor

Abstract

The present invention relates to a braking device 100 for a hydraulic motor 10, a brakeable hydraulic motor, and a vehicle comprising a brakeable hydraulic motor. The braking device 100 comprises at least one brake piston 120a-h and a brake piston housing. The brake piston housing comprises at least one cylinder bore 112a-h in which the brake piston 120a-h is movably received such that the brake piston can be moved from a first position to a second position. In the first position, the brake piston brakes a rotor 30 of the hydraulic motor 10, and in the second position, the brake piston releases the rotor. The brake piston is pre-tensioned in the first position.Furthermore, the cylinder bore 112a-h can be connected to a drive hydraulic circuit of the hydraulic motor 10, so that at least one brake piston 120 is forced into the second position by hydraulic fluid when hydraulic fluid from the drive hydraulic circuit flows into the at least one cylinder bore 112a-h.

Description

Field of the invention

[0001] The present invention relates to a braking device for a hydraulic motor, a brakeable hydraulic motor comprising the braking device and a vehicle, in particular a construction machine, comprising the brakeable hydraulic motor. background

[0002] Hydraulic motors are well-known and are used primarily in construction machinery. For example, hydraulic motors are used as rotary drives for excavator buckets or as rotary drives for grapples on excavators, front loaders, or loading cranes. Well-known hydraulic motors are characterized by their reliability, robustness, and long service life.

[0003] Although conventional hydraulic motors have high holding torques, undesired rotational movement can occur under heavy load or unfavorable load distribution. This undesired rotational movement can lead to uncontrolled sagging of the moving load and / or damage to the hydraulic motor. Furthermore, uncontrolled sagging poses a hazard to the surrounding area and increases the risk of damage to the moving load.

[0004] For example, if logs or pipes are loaded using a grapple connected to a construction machine via a hydraulic motor and the ends are gripped, almost the entire length of the log or pipe acts as a lever. The resulting high leverage can cause the grapple to rotate uncontrollably and the load to sink. To prevent this, hydraulic motors in common applications are equipped with additional brakes. Multi-disk brakes are used in particular. However, these brakes significantly increase the required installation space (particularly in the axial direction of the hydraulic motor's rotation axis). Thus, the use of conventional brakes contradicts the requirement for hydraulic motors of this type to be as compact and lightweight as possible. Description of the invention

[0005] It is therefore the object of the present invention to provide a compact and preferably easy-to-operate braking device for a hydraulic motor, as well as a compact, brakeable hydraulic motor. This object is achieved by a braking device according to claim 1 and a brakeable hydraulic motor according to claim 10. A further aspect of the invention is a vehicle according to claim 15, which comprises a corresponding brakeable hydraulic motor. Further aspects of the invention are set forth in the subclaims and the following description.

[0006] In particular, the object is achieved by a braking device for a hydraulic motor. The braking device comprises at least one brake piston and a brake piston housing. The brake piston housing comprises at least one cylinder bore in which the brake piston is movably received. If multiple brake pistons are provided, each brake piston is received in a corresponding cylinder bore.

[0007] The brake piston(s) is / are received in the cylinder bore(s) in such a way that it / they can be moved from a first position to a second position.

[0008] In the first position, the brake piston brakes a rotor of the hydraulic motor if the braking device is coupled to the hydraulic motor. In particular, the brake piston can block the rotor in the first position. If the hydraulic motor is used, for example, to drive a rotary axis of a gripper, the rotor can be braked / blocked for a certain period of time or for certain work steps if at least one brake piston is in the first position.

[0009] Braking / blocking allows for very high holding torques to be provided. Even with heavy loads and / or unfavorable load distributions (e.g., when gripping pipes or logs at the end), uncontrolled rotation of the hydraulic motor can be avoided. This allows heavier loads to be moved safely without posing a danger to the surrounding area and / or without fear of damage to the hydraulic motor.

[0010] If at least one brake piston is in the second position, it releases the rotor, allowing it to rotate unhindered. If multiple brake pistons are provided, they can be moved from the first to the second position essentially simultaneously to release the rotor. Or, the brake pistons can be moved one after the other (sequentially) from the first to the second position.

[0011] In the first position, the brake piston is preloaded. In other words, the first position is the brake piston's home position, meaning the rotor is braked or blocked in the home position. To move the brake piston(s) to the second position, they must be actively adjusted.

[0012] For this purpose, the at least one cylinder bore can be connected to a drive hydraulic circuit of the hydraulic motor. The hydraulic connection between the cylinder bore and the drive hydraulic circuit can be a permanent hydraulic connection that is established once when the braking device is coupled to the hydraulic motor. Alternatively, the hydraulic connection can comprise at least one valve, in particular a bypass valve, which can at least temporarily interrupt the hydraulic connection even when the braking device and hydraulic motor are coupled. By opening the at least one valve, the at least one cylinder bore can be connected to the drive hydraulic circuit. In one aspect, each cylinder bore is assigned a corresponding valve. In another aspect, several, preferably all, cylinder bores are assigned to one valve.

[0013] If the at least one cylinder bore is connected to the drive hydraulic circuit, the at least one brake piston can be urged into the second position by hydraulic fluid when the hydraulic fluid flows from the drive hydraulic circuit into the at least one cylinder bore.

[0014] The braking device is thus independent of additional hydraulic circuits and preferably specific hydraulic pumps, because at least one cylinder bore is connected (via valve(s)) to the drive hydraulic circuit. The hydraulic fluid supplied to the hydraulic motor is also used to move the brake piston(s) from the first to the second position, thus releasing the rotor of the hydraulic motor.

[0015] This allows for a simple and compact design of the braking device and the brakeable hydraulic drive. Furthermore, easy operation is also possible.

[0016] In one aspect of the invention, the at least one brake piston is arranged so as to be axially displaceable relative to the rotational axis A of the hydraulic motor. The direction of movement is thus substantially parallel to the rotational axis. Alternatively, the at least one brake piston can be arranged so as to be radially displaceable relative to the rotational axis of the hydraulic motor. This radial displaceability enables a reduced overall length of the hydraulic motor in the longitudinal direction. This is particularly advantageous for use in construction machinery.

[0017] In particular, the at least one brake piston can be movably arranged such that it is arranged closer to the rotational axis of the hydraulic motor in the first position than in the second position. To release the rotor of the hydraulic motor, the at least one brake piston is moved radially outward in this case. To brake / lock the rotor, the brake piston is moved radially inward in the opposite direction. The at least one brake piston can thus act on a circumferential surface of the rotor or an output shaft of the hydraulic motor, which circumferential surface is preferably designed as a friction surface, to brake or lock the rotor.

[0018] In particular, the braking device can comprise multiple brake pistons. If multiple brake pistons are provided, the braking torque or blocking torque can be increased accordingly. The holding torque of the braked hydraulic motor increases accordingly. Furthermore, a more even load distribution can be achieved.

[0019] Particularly preferably, the brake pistons are evenly distributed circumferentially around the rotational axis of the hydraulic motor. For example, the braking device comprises at least three brake pistons, or at least four brake pistons, or at least five brake pistons, or at least six brake pistons, or at least seven brake pistons, or at least eight brake pistons. If, for example, eight brake pistons are provided and these are evenly distributed circumferentially, the translational movement axes of the brake pistons each enclose an angle of 45°.

[0020] In one aspect, the brake piston housing is ring-shaped and designed to engage around the rotor of the hydraulic motor or an output shaft of the hydraulic motor. This allows the braking device to be easily installed or even retrofitted to existing hydraulic motors. The brake piston housing can be formed as a single piece (integral) or it can be composed of multiple housing parts. In particular, the ring shape can be achieved by assembling several (at least two) ring segments. This further simplifies assembly.

[0021] Furthermore, the brake piston housing can comprise a plurality of cylinder bores. The cylinder bores can be connected to one another via a hydraulic channel. Thus, the hydraulic fluid can be supplied to all cylinder bores, preferably at the same pressure. Thus, the brake pistons can be forced from the first to the second position essentially simultaneously.

[0022] The hydraulic channel connecting the cylinder bores can optionally be formed (at least partially) by an inner surface of the brake piston housing and an outer surface of the rotor or an output shaft of the hydraulic motor. In one aspect of the invention, the inner surface of the brake piston housing, the outer surface of the rotor, and / or the output shaft of the hydraulic motor has at least one groove. This at least one groove can at least partially define the hydraulic channel.

[0023] The braking device can further comprise at least one bypass valve. The bypass valve can be, for example, a check valve and / or a control valve. In particular, the bypass valve is arranged between the at least one cylinder bore and the drive hydraulic circuit of the hydraulic motor, so that the bypass valve directs hydraulic fluid into the at least one cylinder bore when the pressure in the drive hydraulic circuit exceeds a predefined minimum drive pressure.

[0024] In this case, the braking device preferably brakes / blocks the rotor of the hydraulic motor automatically and releases the rotor again when the predefined minimum drive pressure is exceeded. To release the rotor, an operator (e.g. of a construction machine) does not need to take any additional actions. As soon as the hydraulic motor is braked (preferably at a standstill) and the predefined minimum drive pressure is undershot, the brake piston(s) are preloaded into the first position and brake / block the rotor of the hydraulic motor. When the hydraulic motor starts up again, e.g. to perform a desired rotary movement, the drive pressure initially increases. If the predefined minimum drive pressure is (again) exceeded, the brake piston(s) are pushed into the second position and the rotor is released. The desired rotary movement can then be performed.

[0025] The bypass valve can, in particular, be an adjustable bypass valve. Using the adjustable bypass valve, the predefined minimum drive pressure can be set. This allows you to specify the point at which the rotor should be braked / blocked or released again.

[0026] The bypass valve can also be a controlled valve that can be opened and / or closed manually or by a control command. Opening the valve allows the rotor to be released; closing it allows the rotor to be braked / blocked.

[0027] In one aspect, the at least one brake piston is preloaded in the first position by an elastic element. The elastic element can, for example, be a compression spring associated with a brake piston and urging the brake piston into the first position. In particular, the elastic element can be arranged in the cylinder bore.

[0028] For example, the at least one cylinder bore can be a through-bore which, in addition to the actual brake piston, accommodates the elastic element and a threaded element. The elastic element can be arranged in the cylinder bore such that it is supported on the threaded element with a first side and acts on the brake piston with a second side, which is opposite the first side. If multiple cylinder bores are provided, at least some of these cylinder bores (preferably all of them) can accommodate a brake piston, an elastic element and a threaded element. If the threaded element is screwed further into the cylinder bore, the preload force with which the elastic element preloads the brake piston into the first position can be increased. Thus, a higher minimum drive pressure is necessary to urge the brake piston from the first position to the second position.If the threaded element is turned further out of the cylinder bore, the preload force and thus the minimum drive pressure can be reduced accordingly.

[0029] Preferably, the threaded element(s) are arranged on the braking device in such a way that they can be adjusted (i.e., screwed in or out) even when the braking device is coupled to the hydraulic motor. Thus, the preload force can be adjusted even when the braking device is mounted.

[0030] In addition, the cylinder bore can be designed so that the brake piston (and preferably the elastic element) can be removed from the cylinder bore once the threaded element has been completely unscrewed. This allows worn brake pistons to be easily serviced and / or replaced.

[0031] In a further aspect, the at least one brake piston is alternatively or additionally hydraulically preloaded. For this purpose, hydraulic fluid can be directed into the cylinder bore such that the brake piston is forced into the first position. This can be controlled via at least one valve, whereby a corresponding valve can be assigned to each cylinder bore. In another aspect, several, preferably all, cylinder bores are assigned to one valve. In a further aspect, the preload force is adjustable, in particular controllable.

[0032] The at least one brake piston can comprise a base body, wherein the base body has a friction surface that engages with the rotor of the hydraulic motor or an output shaft of the hydraulic motor when the at least one brake piston is in the first position and the braking device is coupled to the hydraulic motor. The friction surface can provide a higher coefficient of friction than the base body and, for example, comprise abrasion-resistant particles. For this purpose, the friction surface can have at least one friction layer, wherein the friction layer, for example, comprises Fermuid and / or consists of Fermuid. In one aspect, the friction layer can be applied to the friction surface through a heat treatment step. Fermuid is a coating material also known under the name "Thermuit" or "Thermouit." For example, a Thermouit coating is offered by Thermouit Brake Lining.Surprisingly, this coating has been shown to result in high braking forces, even when the friction surface is wetted with hydraulic fluid.

[0033] This task is also achieved by a brakeable hydraulic motor. The brakeable hydraulic motor comprises a hydraulic motor and a braking device as described above.

[0034] The hydraulic motor comprises a stator, a rotor, and optionally an output shaft coupled to the rotor. The coupling between the rotor and output shaft can be rigid or comprise a gear. A braking or blocking torque acting on the output shaft then also acts on the rotor. Thus, the rotor can also be braked or blocked by braking or blocking the output shaft. The hydraulic motor also comprises a drive hydraulic circuit, wherein the hydraulic motor is configured to convert hydraulic pressure in the drive hydraulic circuit into a rotary motion of the rotor.

[0035] For example, the hydraulic motor is a hydraulic motor as described and particularly claimed in EP 2 647 793 A1.

[0036] The braking device is arranged on the hydraulic motor in such a way that the at least one brake piston brakes, preferably blocks, the rotor of the hydraulic motor in the first position and releases the rotor in the second position.

[0037] In particular, the hydraulic motor can be an internal rotor motor. In this case, the at least one brake piston preferably acts on an output shaft of the hydraulic motor. Alternatively, the hydraulic motor can be an external rotor motor. In this case, the at least one brake piston can act directly on the rotor and / or on an output shaft.

[0038] Furthermore, the brake piston housing can be connected to the stator of the hydraulic motor in a rotationally fixed manner. Preferably, the brake piston housing is connected directly to the stator. In an alternative embodiment, the brake piston housing is indirectly connected to the stator.

[0039] In one aspect, the braked hydraulic motor is configured such that the at least one brake piston is actuated with hydraulic fluid from the drive hydraulic circuit, preferably without an additional hydraulic pump being provided for the braking device. Thus, a brakeable hydraulic motor can be provided in a simple manner. In another aspect, an additional hydraulic pump is provided, which can supply the hydraulic motor and thus the braking device with hydraulic fluid if the actual hydraulic pump fails. This allows for an emergency running feature to be provided.

[0040] In one aspect, the at least one brake piston, in the first position, acts radially on a braking surface of the rotor or a braking surface of the output shaft. The braking surface can be formed integrally with the rotor (in particular a rotor housing) or the output shaft. For example, the braking surface can be machined and / or surface-treated, in particular hardened. Furthermore, the braking surface can have a friction layer. The friction layer can comprise Fermuid and / or consist of Fermuid.

[0041] Furthermore, the object is achieved by a vehicle, in particular a construction machine (for example, an excavator, a loading crane, a front loader, or the like). The vehicle comprises a hydraulic pump and at least one brakeable hydraulic motor of the type described above. The hydraulic pump is configured to supply the drive hydraulic circuit of the hydraulic motor with pressurized hydraulic fluid. The brakeable hydraulic motor is preferably assigned to an axle of a work device, in particular to a rotational axis of a gripper. Thus, heavy loads or loads with an unfavorable load distribution can be securely gripped and moved. Short description of the characters

[0042] Specific embodiments of the present invention are illustrated in the accompanying figures. These are intended to assist in understanding the invention. In particular, Fig. 1 is a schematic representation of a construction machine with a rotatable grab; Fig. 2 is a schematic representation of a rotatable grab with a gripped load; Fig. 3 is a schematic longitudinal sectional representation of a hydraulic motor with a braking device; Fig. 4 is a schematic cross-sectional representation of a hydraulic motor with a braking device; Fig. 5 is a schematic cross-sectional representation of a brake piston housing of the braking device; and Fig. 6 is a schematic longitudinal sectional representation of a brake piston with associated elastic element and threaded element. Detailed description of the characters

[0043] Figure 1shows a schematic representation of a construction machine 1, in particular an excavator with a rotatable grab 2. The grab comprises two gripping jaws 2a, 2b, which serve to grip a load 5. The grab 2 is attached to a movable excavator arm via a hydraulic motor 10. By means of the hydraulic motor 10, the grab 2 can be rotated about the rotation axis A2. Accordingly, a gripped load, such as a pipe or a tree trunk, can be rotated.

[0044] The construction machine 1 also comprises a hydraulic pump 3 which is designed to supply the drive hydraulic circuit of the hydraulic motor with pressurized hydraulic fluid.

[0045] In the Figure 1In the example shown, the load 5 is gripped at its ends. Due to the unfavourable load distribution, very high torques act on the gripper and the hydraulic motor 10, since essentially the entire length of the gripped load 5 acts as a lever, as Figure 2 In order to prevent unwanted rotation of the hydraulic motor 10, a braking device 100 is coupled to the hydraulic motor 10. In particular, the braking device 100 surrounds a rotor of the hydraulic motor 10, as shown in particular in the sectional views in Figure 3 and 4 is shown.

[0046] Figure 3 is a schematic longitudinal sectional view of a hydraulic motor 10 coupled to a braking device 100. Figure 4 shows a schematic cross-sectional view of the hydraulic motor 10 and the braking device 100.

[0047] In the example shown, the hydraulic motor 10 is an external rotor motor with a rotational axis A. A stator 20 is arranged centrally and serves to support a rotor 30. The rotor 30 is rotatably mounted on the stator 10 via rolling bearings 50. A drive hydraulic circuit 35 of the hydraulic motor 10 can be supplied with hydraulic fluid via a hydraulic line 32. The pressure of the hydraulic fluid in the drive hydraulic circuit 35 can be converted into a rotary movement of the rotor 30. In addition, the rotor 30 is rigidly connected to a connecting flange 40. A tool, for example a gripper, can then be mounted on the connecting flange 40 so that the tool can be rotated about the rotational axis A by means of the hydraulic motor 10. The stator 10 can, for example, be arranged on a construction machine, for example an arm of an excavator.

[0048] The stator is further connected in a rotationally fixed manner to a brake piston housing 110 of a braking device 100. For this purpose, receptacles 114 for fastening means (e.g., screws, bolts, or rivets) are provided in the brake piston housing 110. The rotor 30 has an outer circumferential surface 36 that includes a friction surface or is designed as a friction surface. Brake pistons 120a-h of the braking device 100 can engage with the friction surface of the rotor to brake or lock the rotor.

[0049] As in Figure 4 As shown, the brake device 100 comprises eight brake pistons 120a-h. The brake piston housing, which here is designed as a single piece and is annular, accordingly comprises eight cylinder bores 112a-h. It is understood that the number of brake pistons and cylinder bores can be varied.

[0050] The brake pistons 120a-h are movably accommodated in the respective cylinder bores 112a-h and can be moved from a first position to a second position. Figures 3 and 4 The first position is shown in each case. In the first position, the brake piston 120a-h is preloaded by an elastic element and brakes / blocks the rotor 30. The brake pistons 120a-h are in contact with the friction surface of the rotor in the first position. This contact generates the braking or blocking torque. This is described in detail with respect to Figure 6 described.

[0051] The cylinder bores 112a-h can be connected to the drive hydraulic circuit 35 via hydraulic channels 60, 160 and valves 130, and thus supplied with hydraulic fluid. When hydraulic fluid flows into the cylinder bores, the brake pistons 120a-h are forced from the first position to the second position. In the second position, the rotor 30 is released. The rotor 30 of the hydraulic motor can rotate unbraked.

[0052] The hydraulic channel 60 is formed by a groove in the outer surface (circumferential surface 36) of the rotor 30 and by an inner surface of the brake piston housing 110. The hydraulic channel 160 is formed by a groove in the inner surface of the brake piston housing 110 and an outer surface (circumferential surface 36) of the rotor 30. These hydraulic channels 60, 160 connect the cylinder bores to one another. Thus, when a predefined minimum drive pressure is exceeded, hydraulic fluid can flow into the cylinder bores 112a-h almost simultaneously, pushing the brake pistons 120a-h into the second position essentially simultaneously. Likewise, with a corresponding pressure drop, the brake pistons can return to the first position (due to the preload force applied by the elastic element) and brake / lock the rotor 30.

[0053] As in Figure 4As shown, the braking device 100 further comprises a bypass valve, which is designed here as a check valve. The bypass valve 130 is located between the cylinder bores 112a-h and the drive hydraulic circuit 35 of the hydraulic motor 10. The bypass valve 130 directs hydraulic fluid into the cylinder bores (via the hydraulic channels 60, 160) when the pressure in the drive hydraulic circuit 35 exceeds the predefined minimum drive pressure. The bypass valve 130 can, in particular, be an adjustable bypass valve, so that the predefined minimum drive pressure can be set by means of the bypass valve 130.

[0054] Figure 5shows the annular brake piston housing 110 again without any additional components. The brake piston housing 110 has eight cylinder bores 112a-h that are radially aligned. Furthermore, the cylinder bores 112a-h are evenly distributed around the circumference. In the illustrated embodiment, two adjacent cylinder bores form an angle of 45°.

[0055] In Figure 6 A single brake piston 120 is shown. The brake piston comprises a base body with a friction surface. The friction surface is coated with a friction layer 124. The friction layer 124 can comprise Fermuid or be made of Fermuid. The brake piston 120 is received in a corresponding cylinder bore such that the friction layer 124 engages the rotor 30 (particularly its friction surface) when the brake piston 120 is in the first position.

[0056] Furthermore, a receptacle 123 is provided in the base body 122. An elastic element, such as a compression spring 126, can be received in this receptacle 123. A threaded element 128 can be provided on the side of the compression spring 126 opposite the brake piston 120. The brake piston 120, the elastic element 126, and the threaded element 128 are received in the cylinder bore, so that the elastic element 126 is arranged between the brake piston 120 and the threaded element 128. The threaded element 128 is, for example, Figure 3 shown, is screwed into the cylinder bore and then preloads the elastic element 126. This preload causes the brake piston 120 to be pushed into the first position, i.e., preloaded in the first position.

[0057] Some of the embodiments are described in more detail than others with reference to the accompanying figures. However, other embodiments are also included in the present disclosure. The present disclosure should not be understood as being limited only to the embodiments explicitly set forth herein; rather, these embodiments are given as examples to convey the scope of the inventive subject matter to those skilled in the art. The present invention may, of course, be embodied otherwise than as set forth herein without thereby affecting essential features of the invention. The present embodiments are to be considered in all respects as illustrative and not restrictive, so that modifications of the described embodiments may also fall within the scope of protection. List of reference symbols

[0058] 1Vehicle (especially construction machinery) 2Grapple 2aGrapple jaw 2bGrapple jaw 3Hydraulic pump 5Load 10Hydraulic motor 20Stator 30Rotor 32Hydraulic line 35Drive hydraulic circuit 36Outer peripheral surface 40Connecting flange 50Rolling bearing 60Hydraulic channel 100Brake device 110Brake piston housing (cylinder ring) 112a-hCylinder bore 114Hole for fastening device 120Brake piston 120a-hBrake piston 122Base body 123Hole 124Friction layer 126Elastic element (e.g. compression spring) 128Threaded element 130Bypass valve 160Hydraulic channel ARotation axis A 2 Rotation axis of the grab

Claims

1. A braking device (100) for a hydraulic motor (10), wherein the braking device (100) comprises at least one brake piston (120a-h) and a brake piston housing (110), wherein the brake piston housing (110) comprises at least one cylinder bore (112a-h) in which the brake piston (120a-h) is movably received, such that the brake piston (120a-h) can be moved from a first position to a second position, wherein the brake piston (120a-h) brakes a rotor (30) of the hydraulic motor (10) in the first position when the braking device (100) is coupled to the hydraulic motor (10), and wherein the brake piston (120a-h) releases the rotor (30) in the second position, wherein the brake piston (120a-h) is prestressed in the first position, and wherein the cylinder bore (112a-h) is provided with a drive hydraulic circuit (35) of the hydraulic motor (10) so that the at least one brake piston (120) is urged into the second position by hydraulic fluid,when hydraulic fluid flows from the drive hydraulic circuit (35) into the at least one cylinder bore (112a-h).

2. Braking device (100) according to claim 1, wherein the at least one brake piston (120a-h) is arranged radially displaceable with respect to the axis of rotation (A) of the hydraulic motor, and wherein the brake piston (120) is optionally arranged closer to the axis of rotation (A) in the first position than in the second position.

3. Braking device (100) according to claim 1 or 2, wherein the braking device (100) comprises a plurality of brake pistons (120a-h), and wherein the brake pistons (120a-h) are preferably distributed uniformly circumferentially around the axis of rotation (A).

4. Braking device (100) according to one of the preceding claims, wherein the brake piston housing (110) is annular and is designed to encompass the rotor (30) of the hydraulic motor (110) or an output shaft of the hydraulic motor (110).

5. Braking device (100) according to one of the preceding claims, wherein the brake piston housing (110) comprises a plurality of cylinder bores (112a-h), and wherein the cylinder bores (112a-h) are connected to one another via a hydraulic channel (60, 160), wherein the hydraulic channel (60, 160) is optionally formed by an inner circumferential surface of the brake piston housing (110) and an outer circumferential surface of the rotor (30) or an output shaft of the hydraulic motor (10), and wherein further optionally the inner circumferential surface of the brake piston housing (110), the outer circumferential surface of the rotor (30) and / or the output shaft of the hydraulic motor (10) can have a groove which at least partially defines the hydraulic channel (60, 160).

6. Braking device (100) according to one of the preceding claims, wherein the braking device (100) further comprises at least one bypass valve (130), in particular a check valve and / or a control valve, wherein the bypass valve (130) is arranged between the at least one cylinder bore (112a-h) and the drive hydraulic circuit of the hydraulic motor (10), and wherein the bypass valve (130) directs hydraulic fluid into the at least one cylinder bore (112a-h) when the pressure in the drive hydraulic circuit exceeds a predefined minimum drive pressure, wherein the bypass valve (130) can be an adjustable bypass valve (130) such that the predefined minimum drive pressure can be set by means of the bypass valve (130), or when the bypass valve (130) is opened in a controlled manner.

7. Braking device (100) according to one of the preceding claims, wherein the at least one brake piston (120a-h) is prestressed in the first position by an elastic element (126) and / or hydraulically.

8. Braking device (100) according to claim 7, wherein a preload force with which the at least one brake piston (120a-h) is preloaded in the first position is adjustable, in particular controllable.

9. Braking device (100) according to one of the preceding claims, wherein the at least one brake piston (120a-h) comprises a base body (122), and wherein the base body (122) has a friction surface which engages with the rotor (30) of the hydraulic motor (110) or an output shaft of the hydraulic motor (110) when the at least one brake piston (120a-h) is in the first position and the braking device (100) is coupled to the hydraulic motor (10), and wherein the friction surface has at least one friction layer (124), wherein the friction layer (124) optionally comprises Fermuid and / or consists of Fermuid.

10. A brakeable hydraulic motor, comprising a hydraulic motor (10) and a braking device (100) according to one of the preceding claims, wherein the hydraulic motor (10) comprises a stator (20), a rotor (30) and optionally an output shaft coupled to the rotor (30) and a drive hydraulic circuit, and wherein the hydraulic motor (10) is designed to convert hydraulic pressure in the drive hydraulic circuit into a rotary movement of the rotor, and wherein the braking device (100) is arranged on the hydraulic motor (10) such that the at least one brake piston (120a-h) brakes the rotor (30) of the hydraulic motor (10) in the first position and releases the rotor (30) in the second position.

11. Brakeable hydraulic motor according to claim 10, wherein the hydraulic motor (10) is an internal rotor motor or an external rotor motor.

12. Brakable hydraulic motor according to claim 10 or 11, wherein the brake piston housing (110) is connected to the stator (20) in a rotationally fixed manner.

13. Brakable hydraulic motor according to one of claims 10 to 12, wherein the at least one brake piston (120a-h) is actuated with hydraulic fluid from the drive hydraulic circuit and preferably no additional hydraulic pump is provided for the braking device (100).

14. Brakable hydraulic motor according to one of claims 10 to 14, wherein the at least one brake piston (120a-h) acts radially on a braking surface of the rotor (30) or a braking surface of the output shaft in the first position.

15. Vehicle (1), in particular a construction machine, comprising a hydraulic pump (3) and at least one brakeable hydraulic motor according to one of claims 10 to 14, wherein the hydraulic pump (3) is designed to supply the drive hydraulic circuit of the hydraulic motor (10) with pressurized hydraulic fluid, and wherein the brakeable hydraulic motor is preferably assigned to an axis of a working device, in particular to a rotational axis (A2) of a gripper (2).

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