A brake and hydraulic motor

Abstract

This utility model relates to the field of hydraulic technology, and particularly to a brake and a hydraulic motor. A brake includes: a housing comprising a rotating housing and a fixed housing, the fixed housing extending into the rotating housing and rotatably engaging with it; a main shaft, the first end of which rotates and engages with the rotating housing, and the second end extending into the fixed housing and contacting its inner surface; a sealing structure is provided between the main shaft and the fixed housing; a brake assembly disposed between the rotating housing and the fixed housing; and a piston assembly disposed on the main shaft and acting on the brake assembly. A connecting release oil passage is formed on the fixed housing and the main shaft, through which oil enters the release chamber within the piston assembly. The release oil passages on the fixed housing and the main shaft are connected at their contact points. This invention solves the technical problem in the prior art where brake oil enters the brake chamber of a piston machine, allowing contaminants from the brake chamber to enter the piston machine and affecting its normal operation.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic technology, and in particular to a brake and a hydraulic motor. Background Technology

[0002] In many propulsion vehicle applications that incorporate hydraulic motors, the motors have parking brakes. Typically, as is widely known to those skilled in the art today, brake assemblies used with hydraulic motors involve brake components (e.g., friction discs) that are biased to brake engagement by a spring mechanism and moved to brake disengagement by hydraulic pressure.

[0003] For example, application number CN202411349996.7 discloses a radial piston mechanism with a multi-disc brake, specifically disclosing that: the brake disc assembly includes multiple first and multiple second brake discs, which are alternately arranged side-by-side along the axis of rotation. The first brake discs are connected to a first annular section in a way that resists relative rotation. The first annular section has multiple grooves extending parallel to the axis of rotation on its inner circumferential surface, into which the extensions of the first brake discs are respectively form-fitted. The second annular section has similar grooves extending parallel to the axis of rotation on its outer circumferential surface, into which the extensions of the second brake discs are respectively form-fitted. The grooves are preferably arranged uniformly around the axis of rotation. The brake disc assembly is arranged inside the brake chamber. Therefore, the first and second annular sections segmentally define the brake chamber. A brake piston, movable along the axis of rotation and extending annularly around the axis of rotation, is arranged between the brake disc assembly and the disc sections. The brake piston also defines the brake chamber. A spring for pre-tensioning the multi-disc brake to the closed state is arranged between the brake piston and the disc sections. The spring is preferably constructed as a single disc spring. It is conceivable that the spring comprises multiple helical springs arranged uniformly around the axis of rotation. Also noteworthy is the third fluid channel, which permanently connects the brake chamber to the brake interface. This third fluid channel consists of two straight holes that extend entirely within the third housing section.

[0004] The brake in the piston machine described above can perform braking and releasing functions, but the brake fluid introduced through the brake port will pass through the brake chamber where the brake disc is located, and the contaminants generated by the friction of the brake disc will flow into the piston machine, affecting the normal operation of the piston machine. Utility Model Content

[0005] To address the technical problem in existing piston compressors where brake oil enters the brake chamber, causing contaminants from the brake chamber to enter the piston compressor and affecting its normal operation, this invention provides a brake and a hydraulic motor that solve the aforementioned technical problem.

[0006] The technical solution of this utility model is as follows:

[0007] This utility model provides a brake, comprising:

[0008] The outer casing includes a rotating housing and a fixed housing, wherein the fixed housing extends into the interior of the rotating housing and rotates therewith;

[0009] The main shaft has a first end that rotates with the rotating housing, and a second end that extends into the fixed housing and contacts the inner surface of the fixed housing. A sealing structure is provided between the main shaft and the fixed housing.

[0010] A braking assembly is disposed between the rotating housing and the stationary housing;

[0011] A piston assembly is mounted on a main shaft and acts on a braking assembly. A release oil passage is formed on the fixed housing and the main shaft. Oil enters the release chamber inside the piston assembly through the release oil passage. The release oil passage on the fixed housing and the main shaft are connected at their contact points. The sealing structure is located between the connection point of the release oil passage and the piston assembly.

[0012] According to one embodiment of the present invention, the spindle is connected to the rotating housing via a connecting plate, and the connecting plate is fixed to the rotating housing by fasteners.

[0013] According to one embodiment of the present invention, at least two fasteners have corresponding fastening holes that are connected to lubricating oil passages, at least one lubricating oil passage introduces lubricating oil to the braking assembly, and at least one lubricating oil passage introduces lubricating oil to the bearing between the fixed housing and the rotating housing.

[0014] According to one embodiment of the present invention, the braking assembly and the bearing are arranged adjacent to each other, and the space in which they are located is connected.

[0015] According to one embodiment of the present invention, the sealing structure includes a shaft seal and an oil seal, which are separated by a retaining ring.

[0016] According to one embodiment of the present invention, the inner surface of the fixed housing and the outer surface of the main shaft form opposing limiting surfaces, and the sealing structure is assembled between the two limiting surfaces.

[0017] According to one embodiment of the present invention, a first release oil passage is formed on the fixed housing, a second release oil passage is formed on the main shaft, and an annular groove is formed on the outer peripheral surface of the main shaft. The first release oil passage and the second release oil passage are connected through the annular groove.

[0018] According to one embodiment of the present invention, the first release oil passage has an inner release port and an outer release port, and the second release oil passage passes through the central axis of the main shaft.

[0019] According to one embodiment of the present invention, the piston assembly includes a piston and a piston ring. The piston and the piston ring are both sealed and sleeved on the main shaft. The outer radial end of the piston extends toward the braking assembly with an extension portion. The extension portion is in a sealed sliding fit with the piston ring. Under the action of the elastic element, the extension portion presses against the braking assembly to generate braking force. The release chamber is formed between the piston and the piston ring. Oil is introduced into the release chamber to release the brake.

[0020] This utility model also provides a hydraulic motor, comprising:

[0021] Brake;

[0022] The motor assembly is mounted on the side of the fixed housing away from the rotating housing;

[0023] The motor assembly drives the main shaft to rotate via the linkage shaft.

[0024] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:

[0025] The brake and hydraulic motor of this utility model have a main shaft extending into a fixed housing, facilitating the installation of a sealing structure between the main shaft and the fixed housing. The contact between the main shaft and the fixed housing facilitates the installation of a release oil passage, allowing oil to be drawn from the release port on the fixed housing to the release chamber, thus releasing the brake assembly. The sealing structure is located between the connection point of the release oil passage and the piston assembly, effectively isolating the connection point of the release oil passage from the cavity containing the brake assembly. This prevents contaminants generated during brake assembly use from entering the release oil passage and consequently the hydraulic motor, thus preventing them from affecting the motor's operation. The sealing structure further includes a shaft seal and an oil seal. The shaft seal ensures that oil from the hydraulic motor cannot enter the cavity containing the brake assembly, while the oil seal ensures that lubricating oil from the cavity containing the brake assembly cannot enter the hydraulic motor.

[0026] The brake and hydraulic motor of this utility model are fixed to the main shaft and the rotating housing through fastener fastening holes. The fastening holes can also extend to form lubrication oil passages. At least one lubrication oil passage is connected to the space where the brake assembly is located, and at least one lubrication oil passage is connected to the space where the bearing is located between the fixed housing and the rotating housing. When lubrication is required, the fasteners can be removed, and the brake assembly and bearing can be lubricated through the fastening holes. Since the spaces where the brake assembly and bearing are located are connected, the lubricating oil can be replaced through the two fastening holes. Lubricating oil is introduced into one fastening hole until clean lubricating oil flows out of the other fastening hole, indicating that the lubricating oil replacement is complete. This process can remove contaminants generated by the brake assembly.

[0027] The brake and hydraulic motor of this utility model are provided with an annular groove formed on the outer circumferential surface of the main shaft. The first release oil passage can be kept in communication with the second release oil passage through the annular groove, so that the oil can enter the release chamber through the release oil passage. The first release oil passage is formed with an inner release port and an outer release port, so the oil entering the release chamber can be taken from inside the motor or from the outside. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the brake of this utility model;

[0029] Figure 2 This is a side view of the brake.

[0030] Figure 3 for Figure 2 AA section view;

[0031] Figure 4 for Figure 2 BB cross-sectional view;

[0032] Figure 5 for Figure 4 Enlarged view of part C;

[0033] Figure 6 This is a schematic diagram of the structure of a hydraulic motor;

[0034] Figure 7 This is a cross-sectional view of a hydraulic motor.

[0035] In the figure: 1-outer shell; 11-rotating shell; 111-first lubricating oil passage; 112-first fixing part; 12-fixed shell; 121-first release oil passage; 1211-inner release port; 1212-outer release port; 122-second fixing part; 13-bearing; 14-labyrinth seal; 15-seal; 2-main shaft; 21-second release oil passage; 22-ring groove; 3-brake assembly; 31-first brake pad; 32-second brake pad; 4-piston assembly; 41-piston; 411-extension; 42-piston ring; 43-release chamber; 44-elastic element; 5-sealing structure; 51-shaft seal; 52-oil seal; 53-retaining ring; 6-connecting plate; 61-second lubricating oil passage; 7-end plate; 8-fastener; 20-motor assembly; 30-linkage shaft; 40-end cover. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0037] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0038] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0039] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0040] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0041] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0042] like Figure 1-5 As shown, this embodiment proposes a brake for a hydraulic motor. The brake includes a housing 1, which comprises a rotating housing 11 and a fixed housing 12. The rotating housing 11 and the fixed housing 12 are rotatably coupled, forming an internal accommodating space within the housing 1. A main shaft 2 is disposed inside the housing 1, and the main shaft 2 rotates with the rotating housing 11. When the main shaft 2 is driven to rotate, the rotating housing 11 can rotate together. A braking assembly 3 is disposed between the rotating housing 11 and the fixed housing 12, and a piston assembly 4 is disposed outside the main shaft 2. When the hydraulic motor is not working, the piston assembly 4 presses against the braking assembly 3, and the braking assembly 3 generates braking force, preventing the main shaft 2 and the rotating housing 11 from rotating. When the hydraulic motor is working, oil is introduced into the release chamber of the piston assembly 3, and the oil force causes the piston assembly 4 to no longer press against the braking assembly 3, releasing the braking effect of the braking assembly 3.

[0043] like Figure 1 , 3 As shown in Figure 4, the outer casing 1 includes a rotating housing 11 and a fixed housing 12, which are rotatably coupled by a bearing 13. Specifically, a portion of the fixed housing 12 can extend into the rotating housing 11, and a bearing 13 is provided between the outer peripheral surface of the fixed housing 12 and the inner peripheral surface of the rotating housing 11.

[0044] As a preferred technical solution of this embodiment, the outer surface of the rotating housing 11 is formed with a first fixing part 112, which facilitates connection with the driven structure; the outer surface of the fixed housing 12 is formed with a second fixing part 122, which facilitates the installation of the brake.

[0045] As a preferred technical solution in this embodiment, bearing 13 is a tapered roller bearing.

[0046] As a preferred embodiment, to ensure the airtightness of the interior of the housing 1 and prevent contaminants from entering the housing 1, a labyrinth seal 14 is formed between the rotating housing 11 and the fixed housing 12. Preferably, the labyrinth seal 14 is located radially outward of the bearing 13. More preferably, a sealing element 15 is also provided between the rotating housing 11 and the fixed housing 12, and the sealing element 15 is located between the labyrinth seal 14 and the bearing 13.

[0047] like Figure 3-4 As shown, the main shaft 2 is located inside the outer casing 1. The main shaft 2 rotates with the rotating housing 11, and the main shaft 2 extends into the fixed housing 12 and contacts the inner surface of the fixed housing 12. Specifically, the first end of the main shaft 2 rotates with the rotating housing 11, and the second end of the main shaft 2 extends into the fixed housing 12 and contacts the inner surface of the fixed housing 12.

[0048] As a preferred embodiment, the spindle 2 is rotated and engaged with the rotating housing 11 via a connecting plate 6. The connecting plate 6 is fixedly mounted on the first end of the spindle 2, and the connecting plate 6 is fixedly connected to the rotating housing 11. Specifically, the connecting plate 6 can be axially fixedly sleeved on the spindle 2 and forms a meshing with the spindle 2. When the spindle 2 rotates, it can drive the connecting plate 6 to rotate. The radially outer end of the connecting plate 6 is in contact with the end face of the rotating housing 11 that is away from the fixed housing 12, and the fastener 8 can fix the two together.

[0049] As a preferred technical solution in this embodiment, the second end of the main shaft 2 is formed with a blind hole with an end face opening, and the inner surface of the blind hole is formed with teeth to facilitate transmission with the linkage shaft.

[0050] like Figure 3-5 As shown, the braking assembly 3 is disposed between the rotating housing 11 and the fixed housing 12. The braking assembly 3 includes a first brake pad 31 and a second brake pad 32. Multiple first brake pads 31 and second brake pads 32 can be provided. Multiple first brake pads 31 are axially spaced and mounted on the inner surface of the rotating housing 11. Multiple second brake pads 32 are axially spaced and mounted on the outer surface of the fixed housing 12. The first brake pads 31 and second brake pads 32 are axially staggered.

[0051] As a preferred technical solution in this embodiment, the braking component 3 is located on one axial side of the bearing 13, and the space where the braking component 3 is located is connected to the space where the bearing 13 is located.

[0052] like Figure 3-5As shown, piston assembly 4 is mounted on main shaft 2 and located inside housing 1. Piston assembly 4 is positioned near connecting plate 6 and includes piston 41 and piston ring 42. Piston 41 and piston ring 42 are sealed and fitted onto main shaft 2. Piston ring 42 is positioned near brake assembly 3. An extension 411 extends radially outward from piston 41 toward brake assembly 3, and the extension 411 is in a sealing sliding fit with the radially outward end of piston ring 42. Under the action of elastic member 44, extension 411 can press against brake assembly 3 to generate braking force; a release chamber 43 is formed between piston 41 and piston ring 42. The oil in release chamber 43 generates a release force, pushing piston 41 to move against the action of elastic member 44, thus releasing the brake.

[0053] As a preferred technical solution in this embodiment, in order to ensure sealing, sealing rings are provided between the piston 41 and the main shaft 2, between the extension 411 and the piston ring 42, and between the piston ring 42 and the main shaft 2, so as to completely isolate the release chamber 43 from the space where the braking assembly 3 is located.

[0054] As a preferred embodiment, the elastic element 44 is located between the connecting plate 6 and the piston 41, with its two ends acting on the connecting plate 6 and the piston 41 respectively. The elastic element 44 may be, but is not limited to, a spring.

[0055] like Figure 3 As shown, in order to allow the oil to enter the release chamber 43, the fixed housing 12 and the main shaft 2 are provided with a connected oil release channel. Specifically, the fixed housing 12 is provided with a first oil release channel 121, and the main shaft 2 is formed with a second oil release channel 21. The first oil release channel 121 and the second oil release channel 21 are connected at the contact position between the second end of the main shaft 2 and the fixed housing 12.

[0056] As a preferred technical solution of this embodiment, the first end of the first release oil passage 121 extends to the end face of the fixed housing 12 away from the rotating housing 11, forming an inner release port 1211 and an outer release port 1212. The inner release port 1211 can introduce pressure oil from inside the hydraulic motor; the outer release port 1212 can introduce external control oil. In this way, the braking of the braking assembly 3 can be released by self-control and external control.

[0057] As a preferred embodiment, the first release oil passage 121 and the second release oil passage 21 are connected via an annular groove 22. Specifically, an annular groove 22 is formed on the outer peripheral surface of the main shaft 2, the second end of the first release oil passage 121 extends to communicate with the annular groove 22, and the second release oil passage 21 remains in communication with the annular groove 22. The axial width of the annular groove 22 can be slightly larger than the axial width of the opening at the second end of the first release oil passage 121. In this way, even if the main shaft 2 rotates relative to the fixed housing 12, the communication of the release oil passage can be guaranteed.

[0058] As a preferred technical solution in this embodiment, the second release oil passage 21 is located in the solid part of the main shaft 2, and the second release oil passage 21 passes through the central axis of the main shaft 2.

[0059] like Figure 3-5 As shown, in order to ensure complete isolation between the release oil passage and the space where the braking assembly 3 is located, a sealing structure 5 is also provided between the main shaft 2 and the fixed housing 12. The sealing structure 5 includes a shaft seal 51 and an oil seal 52, which are separated by a retaining ring 53.

[0060] As a preferred technical solution in this embodiment, the inner surface of the fixed housing 12 and the outer peripheral surface of the main shaft 2 are formed with opposing limiting surfaces, and the sealing structure 5 is assembled between the two limiting surfaces.

[0061] As a preferred technical solution in this embodiment, the sealing structure 5 is located between the annular groove 22 and the piston assembly 4. The shaft seal 51 can ensure that the oil in the release oil passage cannot enter the space where the brake assembly 3 is located, and the oil seal 52 can ensure that the lubricating oil in the space where the brake assembly 3 is located cannot enter the release oil passage.

[0062] like Figure 4 As shown, an end plate 7 is stacked on the outside of the connecting plate 6. Multiple fasteners 8 fix the end plate 7, the connecting plate 6, and the rotating housing 11 together. To lubricate the brake assembly 3 and the bearing 13, at least two fastening holes of the fasteners 8 are provided with lubrication oil passages. At least one lubrication oil passage can introduce lubricating oil to the brake assembly 3, and at least one lubrication oil passage can introduce lubricating oil to the bearing 13. The fasteners 8 can be, but are not limited to, bolts.

[0063] As a preferred technical solution in this embodiment, since the spaces where the braking assembly 3 and the bearing 13 are located are connected, the fastening hole and the lubrication oil passage can be used to replace the lubricating oil in the aforementioned space. Figure 4 As shown, one fastener 8 has a fastening hole connected to a first lubricating oil passage 111, which allows lubricating oil to be introduced to the bearing 13. The other fastener 8 has a fastening hole connected to a second lubricating oil passage 61, which allows lubricating oil to be introduced to the outside of the piston assembly 4 and then to the brake assembly 3. When changing the lubricating oil, the fasteners 8 in the two fastening holes connected to the first and second lubricating oil passages 111 and 61 can be removed. Then, lubricating oil can be introduced into the fastening hole connected to the first lubricating oil passage 111. The lubricating oil flows through the first lubricating oil passage 111 to the bearing 13, then to the brake assembly 3, and finally flows out through the second lubricating oil passage 61 and the corresponding fastening hole. When clean lubricating oil flows out, the lubricating oil change is complete. Preferably, two fastening holes with an angle difference of approximately 180° can be selected to connect the lubricating oil passages.

[0064] like Figure 6-7As shown, this embodiment also provides a hydraulic motor, which includes the aforementioned brake, and also includes a motor assembly 20, a linkage shaft 30 and an end cover 40. The motor assembly 20 is mounted on the side of the fixed housing 12 away from the rotating housing 11. The motor assembly 20 drives the main shaft 2 to rotate through the linkage shaft 30. The end cover 40 is stacked on the side of the motor assembly 20 away from the fixed housing 12.

[0065] The motor assembly 20 includes a stator and a rotor that rotate relative to each other. The rotor is located on the inner circumference of the stator. One end of the linkage shaft 30 is driven by the rotor, and the other end of the linkage shaft 30 extends into the second end of the main shaft 2 and is driven by the main shaft 2.

[0066] Based on the above technical solution, the working principle of the hydraulic motor in this embodiment is as follows:

[0067] When the hydraulic motor is not working, there is no high-pressure oil in the release chamber 43 between the piston 41 and the piston ring 42. Under the action of the elastic element 44, the piston 41 squeezes the brake assembly 3, and the first brake pad 31 and the second brake pad 32 are pressed together. This causes the friction between the first brake pad 31 and the second brake pad 32 to hinder the relative rotation between the rotating housing 11 and the fixed housing 12. The fixed housing 12 and the rotating housing 11 will then form a brake, and the hydraulic motor will self-lock.

[0068] When the hydraulic motor is operating normally, the high-pressure oil from the motor assembly 20 enters the release chamber 43 between the piston 41 and the piston ring 42 through the inner release port 1211, the first release oil passage 121, the annular groove 22, and the second release oil passage 21. At this time, the high-pressure oil exerts a force on the piston 41 in the opposite direction to the action of the elastic element 44. The piston 41 moves against the force of the elastic element 44, and the piston 41 has no squeezing effect on the brake assembly 3. At this time, the hydraulic motor automatically releases the brake. In addition, high-pressure oil can also be introduced into the release chamber 43 through the outer release port 1212 to release the brake.

[0069] If lubricating oil needs to be added, it can be introduced into the bearing 13 through the fastening hole connected to the first lubricating oil passage 111, and also into the brake assembly 13 through the fastening hole connected to the second lubricating oil passage 61. When the cleanliness of the lubricating oil in the brake oil chamber is insufficient and needs to be replaced, the following operation can be performed: place the motor horizontally, and pour lubricating oil into one of the fastening holes connected to the lubricating oil passage. When clean lubricating oil overflows from the other fastening hole connected to the lubricating oil passage, the lubricating oil in the space where the brake assembly 3 and bearing 13 are located can be replaced.

[0070] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A brake, characterized in that, include: The outer casing (1) includes a rotating shell (11) and a fixed shell (12), wherein the fixed shell (12) extends into the rotating shell (11) and rotates therewith; The main shaft (2) has a first end that rotates with the rotating housing (11) and a second end that extends into the fixed housing (12) and forms contact with the inner surface of the fixed housing (12). A sealing structure (5) is provided between the main shaft (2) and the fixed housing (12). Braking assembly (3) is disposed between rotating housing (11) and fixed housing (12); The piston assembly (4) is mounted on the main shaft (2) and acts on the braking assembly (3). A release oil passage is formed on the fixed housing (12) and the main shaft (2). Oil enters the release chamber (43) in the piston assembly (4) through the release oil passage. The release oil passage on the fixed housing (12) and the main shaft (2) are connected at the contact position of the two. The sealing structure (5) is located between the connection of the release oil passage and the piston assembly (4).

2. The brake according to claim 1, characterized in that, The main shaft (2) is connected to the rotating housing (11) via a connecting plate (6), and the connecting plate (6) is fixed to the rotating housing (11) by fasteners (8).

3. A brake according to claim 2, characterized in that, At least two fasteners (8) have fastening holes that correspond to and connect to lubricating oil passages. At least one lubricating oil passage introduces lubricating oil to the brake assembly (3) and at least one lubricating oil passage introduces lubricating oil to the bearing (13) between the fixed housing (12) and the rotating housing (11).

4. A brake according to claim 3, characterized in that, The braking assembly (3) and the bearing (13) are arranged adjacent to each other, and the space in which they are located is connected.

5. A brake according to any one of claims 1-4, characterized in that, The sealing structure (5) includes a shaft seal (51) and an oil seal (52), which are separated by a retaining ring (53).

6. A brake according to claim 5, characterized in that, The inner surface of the fixed housing (12) and the outer surface of the main shaft (2) form opposing limiting surfaces, and the sealing structure (5) is assembled between the two limiting surfaces.

7. A brake according to any one of claims 1-4, characterized in that, A first release oil passage (121) is formed on the fixed housing (12), a second release oil passage (21) is formed on the main shaft (2), and an annular groove (22) is formed on the outer peripheral surface of the main shaft (2). The first release oil passage (121) and the second release oil passage (21) are connected through the annular groove (22).

8. A brake according to claim 7, characterized in that, The first release oil passage (121) has an inner release port (1211) and an outer release port (1212), and the second release oil passage (21) passes through the central axis of the main shaft (2).

9. A brake according to any one of claims 1-4, characterized in that, The piston assembly (4) includes a piston (41) and a piston ring (42). Both the piston (41) and the piston ring (42) are sealed and fitted on the main shaft (2). The outer radial end of the piston (41) extends toward the brake assembly (3) with an extension (411). The extension (411) is in a sealed sliding fit with the piston ring (42). Under the action of the elastic element (44), the extension (411) presses against the brake assembly (3) to generate braking force. The release chamber (43) is formed between the piston (41) and the piston ring (42). Oil is introduced into the release chamber (43) to release the brake.

10. A hydraulic motor, characterized in that, include: The brake according to any one of claims 1-9; The motor assembly (20) is mounted on the side of the fixed housing (12) away from the rotating housing (11); Linkage shaft (30), the motor assembly (20) drives the main shaft (2) to rotate through the linkage shaft (30).

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