intermediate shaft brake

Abstract

The application relates to an intermediate shaft brake, which comprises a shell, an oil pump and a brake assembly, the shell is internally provided with a brake cavity and an oil pump cavity which are sequentially arranged along a first direction and are communicated with each other, the shell is provided with an oil inlet communicated with the brake cavity and an oil outlet communicated with the oil pump cavity, the oil pump is arranged in the oil pump cavity, the oil pump comprises a rotor shaft which is arranged in the oil pump cavity along the first direction, the rotor shaft can rotate relative to the shell around a first rotation shaft which is parallel to the first direction, one end of the rotor shaft away from the brake cavity extends out of the shell and is used for being connected with an intermediate shaft, the oil pump is configured to discharge oil out of the oil pump cavity through the oil outlet when the rotor shaft rotates around the first rotation shaft, the brake assembly is arranged in the brake cavity and is connected with the rotor shaft, and the brake assembly is used for reducing the rotating speed of the rotor shaft. The intermediate shaft brake has the advantages that the oil pump is arranged in the shell, a pipeline for connecting the oil pump does not need to be arranged outside the intermediate shaft brake, and the space in a gearbox is saved.

Description

Technical Field

[0001] This application relates to the field of gearbox technology, and in particular to an intermediate shaft brake. Background Technology

[0002] An intermediate shaft is located within an automotive transmission and connects the primary and secondary shafts. By shifting gears with a gear lever, it selects which gears to engage with, allowing the secondary shaft to output different speeds, steering, and torques. Related technology provides a transmission including a housing, and an intermediate shaft brake and an oil pump respectively housed within the housing. The friction pads of the intermediate shaft brake are connected to the intermediate shaft to provide braking torque and reduce the intermediate shaft's speed. The oil pump provides lubrication to the intermediate shaft brake.

[0003] However, in related technologies, the oil pump is connected to the intermediate shaft brake via pipelines, which occupies a large space inside the gearbox. Summary of the Invention

[0004] Therefore, it is necessary to address the issue of the space occupied inside the gearbox due to connecting the oil pump and the intermediate shaft brake through pipelines in related technologies, and to provide an intermediate shaft brake that can save space inside the gearbox.

[0005] According to one aspect of this application, an intermediate shaft brake is provided, comprising:

[0006] The housing has a brake chamber and an oil pump chamber arranged sequentially and communicating with each other along a first direction. The housing has an oil inlet communicating with the brake chamber and an oil outlet communicating with the oil pump chamber.

[0007] An oil pump, disposed within the oil pump chamber, includes a rotor shaft extending through the oil pump chamber along a first direction. The rotor shaft is rotatable relative to the housing about a first axis parallel to the first direction. One end of the rotor shaft, away from the brake chamber, extends out of the housing and is used to connect to an intermediate shaft. The oil pump is configured to discharge oil through the oil outlet into the oil pump chamber when the rotor shaft rotates about the first axis.

[0008] A braking assembly is disposed within the braking chamber and connected to the rotor shaft. The braking assembly is used to reduce the rotational speed of the rotor shaft.

[0009] The aforementioned intermediate shaft brake, by placing the oil pump inside the housing, eliminates the need for external piping to connect the oil pump, thus saving space within the gearbox.

[0010] In one embodiment, the oil pump further includes an inner rotor fixedly sleeved on the rotor shaft, and an outer rotor spaced apart from the inner rotor.

[0011] The outer rotor is capable of rotating relative to the housing around a second axis that is parallel to and spaced apart from the first axis while the inner rotor rotates around the first axis.

[0012] The inner rotor partially meshes with the outer rotor and divides the outer rotor into multiple cavities. Each cavity penetrates the outer rotor along the first direction and connects the oil pump cavity and the brake cavity. The inner rotor and the outer rotor cooperate with each other so that when the inner rotor rotates around the first rotating shaft, the oil in the cavity connected to the oil outlet is pumped out of the oil outlet, and the oil in the brake cavity is drawn into another cavity.

[0013] In one embodiment, the braking assembly includes a rotating part, a friction pad, and a brake pad;

[0014] The rotating part is connected to one end of the rotor shaft near the brake chamber;

[0015] The friction plate is slidably sleeved on the outside of the rotating part along the first direction;

[0016] The brake pad is sleeved on the outside of the rotating part and spaced apart from the rotating part along the radial direction of the rotating part. The brake pad is spaced apart from the friction pad along the first direction, and the brake pad can move relative to the rotating part towards the side closer to the rotor shaft along the first direction to abut against the friction pad and thereby reduce the rotational speed of the rotor shaft.

[0017] In one embodiment, the outer peripheral wall of the rotating part is provided with an external spline, and the inner peripheral wall of the friction plate is provided with an internal spline. The external spline is slidably connected to the internal spline along the first direction.

[0018] In one embodiment, a keyway is defined between every two adjacent teeth of the internal spline, and all the keyways of the internal spline are divided into two groups, each group including at least one keyway of the internal spline, wherein the keyways in one group correspond one-to-one with the teeth of the external spline, and the keyways in the other group form a first oil passage.

[0019] In one embodiment, there are multiple brake pads, which are arranged at intervals along the first direction, and a receiving space is defined between two adjacent brake pads. The friction pads are correspondingly disposed in the receiving space.

[0020] In one embodiment, a positioning element extending longitudinally along the first direction is provided on the cavity wall of the braking cavity;

[0021] The outer peripheral wall of the brake pad is recessed into the brake pad along the radial direction of the rotating part to form a positioning groove, and the positioning member is slidably connected to the positioning groove along the first direction.

[0022] In one embodiment, the rotating part is provided with a second oil passage that extends through the rotating part along the first direction.

[0023] In one embodiment, the intermediate shaft brake further includes a piston assembly;

[0024] The piston assembly is located at one end of the brake chamber away from the oil pump chamber along the first direction, and abuts against the brake pad on the side away from the oil pump chamber along the first direction. The piston assembly is slidably connected to the inner wall of the housing along the first direction, and divides the housing into a first chamber and a second chamber arranged sequentially along the first direction and not communicating with each other. The housing is provided with an air inlet communicating with the first chamber, and the brake assembly is located in the second chamber.

[0025] In one embodiment, the intermediate shaft brake further includes a first elastic element;

[0026] One end of the first elastic member is connected to the end of the rotating part away from the rotor shaft, and the other end of the first elastic member abuts against the piston assembly along the first direction. The first elastic member is configured to provide a spring force that moves the piston assembly along the first direction away from the brake pad.

[0027] In one embodiment, the piston assembly includes a piston body that is movably disposed within the brake chamber along the first direction, and a seal disposed at one end of the piston body near the brake assembly. The seal is sealed to the inner wall of the housing and divides the brake chamber into a first chamber and a second chamber.

[0028] In one embodiment, the housing is further provided with pressure relief channels that are respectively connected to the oil inlet and the oil outlet;

[0029] The intermediate shaft brake also includes a pressure relief valve disposed in the pressure relief channel. The pressure relief valve is configured to connect the oil inlet to the oil outlet through the pressure relief channel when the pressure difference between the oil inlet and the oil outlet is greater than a preset pressure difference. Attached Figure Description

[0030] Figure 1 This is an exploded view of the intermediate shaft brake in one embodiment of this application;

[0031] Figure 2 for Figure 1A partial cross-sectional view of the oil pump and brake assembly in the illustrated embodiment;

[0032] Figure 3 for Figure 1 A schematic diagram of the oil inlet and outlet in the illustrated embodiment;

[0033] Figure 4 for Figure 1 The diagram shows the structure of the oil pump in the embodiment shown.

[0034] Figure 5 for Figure 1 A schematic diagram of the braking assembly in the illustrated embodiment.

[0035] Explanation of icon numbers:

[0036] 100. Intermediate shaft brake;

[0037] 10. Housing; 11. Braking chamber; 111. First chamber; 112. Second chamber; 113. Positioning element; 12. Oil pump chamber; 13. Oil inlet; 14. Oil outlet; 16. Pressure relief passage; 161. First pressure relief passage; 162. Second pressure relief passage; 17. First oil inlet passage; 18. Second oil inlet passage;

[0038] 20. Oil pump; 21. Rotor shaft; 22. Inner rotor; 23. Outer rotor; 24. Cavity;

[0039] 30. Braking assembly; 31. Rotating part; 311. External spline; 312. Second oil passage; 32. Friction pad; 321. Internal spline; 33. Brake pad; 322. First oil passage;

[0040] 40. Piston assembly; 41. Piston body; 42. Seal;

[0041] 50. First elastic element;

[0042] 60. Pressure relief valve; 61. Second elastic element; 62. Sealing element; 63. Adjusting element;

[0043] A. First direction. Detailed Implementation

[0044] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0045] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and 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 of this application.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0049] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0050] Figure 1 This is an exploded view of the intermediate shaft brake in one embodiment of this application; Figure 2 for Figure 1 A partial cross-sectional view of the oil pump and brake assembly in the illustrated embodiment; Figure 3 for Figure 1 A schematic diagram of the oil inlet and outlet in the illustrated embodiment.

[0051] See Figure 1-3 An intermediate shaft brake 100 provided in one embodiment of this application includes a housing 10, an oil pump 20, and a brake assembly 30.

[0052] The housing 10 contains a brake chamber 11 and an oil pump chamber 12 arranged sequentially and communicating with each other along a first direction A. The housing 10 has an oil inlet 13 communicating with the brake chamber 11 and an oil outlet 14 communicating with the oil pump chamber 12. An oil pump 20 is disposed within the oil pump chamber 12 and includes a rotor shaft 21 passing through the oil pump chamber 12 along the first direction A. The rotor shaft 21 is rotatable relative to the housing 10 about a first axis parallel to the first direction A. One end of the rotor shaft 21, away from the brake chamber 11, extends out of the housing 10 and is used to connect to an intermediate shaft. The oil pump 20 is configured to discharge oil from the oil pump chamber 12 through the oil outlet 14 when the rotor shaft 21 rotates about the first axis. A brake assembly 30 is disposed within the brake chamber 11 and connected to the rotor shaft 21. The brake assembly 30 is used to reduce the rotational speed of the rotor shaft 21.

[0053] The aforementioned intermediate shaft brake 100 has a rotor shaft 21 extending out of the housing 10 and connected to an intermediate shaft at one end, and a brake assembly 30 connected to the other end of the rotor shaft 21. The brake assembly 30 reduces the rotational speed of the rotor shaft 21. By connecting the brake assembly 30 to the intermediate shaft via the rotor shaft 21, the rotational speed of the intermediate shaft is reduced, thus achieving braking of the intermediate shaft. An oil inlet 13 communicating with the brake chamber 11 is provided on the housing 10, and the brake assembly 30 is located within the brake chamber 11, allowing oil to enter the brake chamber 11 through the oil inlet 13 for lubrication. Furthermore, since the oil pump chamber 12 communicates with the brake chamber 11, and the oil pump 20 can discharge oil from the oil pump chamber 12 through the oil outlet 14 when the rotor shaft 21 rotates, the oil in the brake chamber 11 can be discharged through the oil pump chamber 12. By placing the oil pump 20 inside the housing 10, there is no need to install a pipeline outside the intermediate shaft brake 100 to connect to the oil pump 20, thus saving space inside the gearbox. Furthermore, the direct connection between the oil pump chamber 12 and the brake chamber 11 avoids pipeline blockage or oil leakage caused by connecting the oil pump 20 and the intermediate shaft brake 100 with pipelines.

[0054] Figure 4 for Figure 1 A schematic diagram of the oil pump in the illustrated embodiment.

[0055] In some embodiments, such as Figure 2-4 As shown, the oil pump 20 also includes an inner rotor 22 fixedly sleeved on the rotor shaft 21, and an outer rotor 23 spaced out from the inner rotor 22. The outer rotor 23 can rotate relative to the housing 10 around a second rotating shaft parallel to and spaced from the first rotating shaft when the inner rotor 22 rotates around the first rotating shaft. The inner rotor 22 and the outer rotor 23 partially mesh, dividing the outer rotor 23 into multiple cavities 24. Each cavity 24 passes through the outer rotor 23 along a first direction A and connects the oil pump cavity 12 and the brake cavity 11. The inner rotor 22 and the outer rotor 23 cooperate with each other so that when the inner rotor 22 rotates around the first rotating shaft, the oil in the cavity 24 connected to the oil outlet 14 is pumped out of the oil outlet 14, and the oil in the brake cavity 11 is sucked into another cavity 24.

[0056] Thus, when the inner rotor 22 rotates, it drives the outer rotor 23 to rotate together. Since the inner rotor 22 and the outer rotor 23 are partially meshed, the inner rotor 22 divides the outer rotor 23 into multiple cavities 24. As the inner rotor 22 and the outer rotor 23 rotate, the volume of each cavity 24 changes continuously. When the inner rotor 22 and the outer rotor 23 disengage, the volume of the corresponding cavity 24 gradually increases, drawing oil into the cavity 24. When the inner rotor 22 and the outer rotor 23 engage, the volume of the corresponding cavity 24 gradually decreases, expelling the oil from the cavity 24. Therefore, the volume of the cavity 24 connected to the oil outlet 14 gradually decreases as the inner rotor 22 rotates, forcing the oil out of the cavity 24. Simultaneously, as the inner rotor 22 rotates, the volume of the cavity 24 gradually increases, drawing in the oil from the brake chamber 11. With the rotation of the inner rotor 22, the oil drawn from the brake chamber 11 is carried to one side of the oil outlet 14. At this point, the inner rotor 22 engages, the volume of the cavity 24 decreases, and the oil is forced out of the oil outlet 14. As the rotor shaft 21 rotates, the oil in the brake chamber 11 is continuously pumped out of the oil outlet 14 by the oil pump 20.

[0057] In some embodiments, such as Figure 3-4 As shown, the sidewall of the oil pump chamber 12 is recessed radially into the housing 10 along the rotor shaft 21 to form a first oil inlet channel 17, and the sidewall of the brake chamber 11 is recessed radially into the housing 10 along the rotor shaft 21 to form a second oil inlet channel 18. Both the first oil inlet channel 17 and the second oil inlet channel 18 extend along a first direction A. One end of the first oil inlet channel 17 is connected to the oil inlet 13, and one end of the second oil inlet channel 18 is connected to the other end of the first oil inlet channel 17. In this way, oil enters the second oil inlet channel 18 from the oil inlet 13 through the first oil inlet channel 17, and then enters the brake chamber 11 to lubricate the brake assembly 30. Furthermore, when the rotor shaft 21 rotates, the oil pump 20 draws the oil from the side of the brake chamber 11 connected to the oil pump 20 out of the brake chamber 11, making the pressure on the side of the brake chamber 11 connected to the oil pump 20 lower. This allows the oil in the second oil inlet channel 18 to enter the brake chamber 11 under the action of pressure difference, and under the action of pressure difference, the oil flows from the oil inlet 13 to the second oil inlet channel 18, thus supplying oil to the brake chamber 11.

[0058] Figure 5 for Figure 1 A schematic diagram of the braking assembly in the illustrated embodiment.

[0059] In some embodiments, such as Figure 2 and Figure 5As shown, the braking assembly 30 includes a rotating part 31, a friction pad 32, and a brake pad 33. The rotating part 31 is connected to one end of the rotor shaft 21 near the brake chamber 11. The friction pad 32 is slidably sleeved on the outside of the rotating part 31 along a first direction A. The brake pad 33 is sleeved on the outside of the rotating part 31 and is spaced apart from the rotating part 31 along the radial direction of the rotating part 31. The brake pad 33 is spaced apart from the friction pad 32 along the first direction A, and the brake pad 33 can move relative to the rotating part 31 towards the side closer to the rotor shaft 21 along the first direction A to abut against the friction pad 32, thereby reducing the rotational speed of the rotor shaft 21. Thus, by connecting the rotating part 31 to the rotor shaft 21 and slidably connecting the friction pad 32 to the rotating part 31 along the first direction A, the rotating part 31 can drive the friction part to rotate together with the rotor shaft 21 around a first axis. By setting the brake pad 33 to be spaced apart from the rotating part 31 radially and spaced apart from the friction pad 32 along the first direction A, the brake pad 33 does not affect the rotation of the rotor shaft 21 when the rotor shaft 21 is working. By setting the brake pad 33 to be able to move relative to the rotating part 31 along the first direction A, the brake pad 33 can abut against the friction pad 32 along the first direction A, thereby reducing the speed of the friction pad 32 under the action of friction between it and the brake pad 33, thereby reducing the speed of the rotating part 31 and the rotor shaft 21, and achieving braking.

[0060] Furthermore, the brake pad 33 can move relative to the rotating part 31 in the first direction A toward the side away from the rotor shaft 21 to release the brake on the rotor shaft 21.

[0061] To prevent the brake pad 33 from rotating relative to the housing 10 about the first pivot, in some embodiments, such as Figure 5 As shown, a positioning member 113 extending longitudinally along the first direction A is provided on the cavity wall of the brake chamber 11. The outer peripheral wall of the brake pad 33 is recessed into the brake pad 33 along the radial direction of the rotating part 31 to form a positioning groove (not shown in the figure). The positioning member 113 is slidably connected to the positioning groove along the first direction A. In this way, the brake pad 33 can only move relative to the housing 10 along the first direction A and cannot rotate relative to the housing 10, so as to prevent the brake pad 33 from rotating with the friction pad 32 under the drive of the friction pad 32, so that the brake pad 33 can reduce the speed of the friction pad 32 more quickly and reliably.

[0062] To prevent the friction plate 32 from rotating relative to the rotating part 31, in some embodiments, such as Figure 5 As shown, the outer peripheral wall of the rotating part 31 is provided with an external spline 311, and the inner peripheral wall of the friction plate 32 is provided with an internal spline 321. The external spline 311 is slidably connected to the internal spline 321 along the first direction A. This allows the friction plate 32 to move relative to the rotating part 31 along the first direction A to engage or disengage with the brake plate 33, thereby achieving braking or contact braking. Furthermore, the internal spline 321 and external spline 311 prevent the friction plate 32 from rotating around the rotating part 31, which could lead to braking failure.

[0063] In some embodiments, such as Figure 5 As shown, each pair of adjacent teeth of the internal spline 321 defines a keyway. All the keyways of the internal spline 321 are divided into two groups, each group including at least one keyway of the internal spline 321. The keyways in one group correspond one-to-one with the teeth of the external spline 311, while the keyways in the other group form a first oil passage 322. This allows the teeth of the internal spline 321 to engage with the keyways in one group, and the keyways in the other group to form a first oil passage 322 for oil to flow through, thereby improving the lubrication effect on the brake assembly 30. In actual use, when the rotor shaft 21 rotates around the first shaft, the oil in the first oil passage 322 flows radially along the rotating part 31 into the gap between the friction plate 32 and the brake plate 33, achieving lubrication.

[0064] Optionally, there are two first oil passages 322 (not shown in the figure), and the two first oil passages 322 are located on opposite sides of the first rotating shaft to provide more uniform lubrication to different parts of the brake assembly 30 along its circumference. For example, the number of teeth of the internal spline 321 can be set to 18, and the number of teeth of the external spline 311 can be set to 16. The two keyways of the internal spline 321 that do not mate with the teeth of the external spline 311 form two first oil passages 322, and the two oil passages are located on opposite sides of the first rotating shaft.

[0065] Furthermore, the two first oil passages 322 are symmetrically arranged about the first rotating axis.

[0066] In some embodiments, such as Figure 2 and Figure 5 As shown, the rotating part 31 is provided with a second oil passage 312 that extends through the rotating part 31 along the first direction A. In this way, by providing the second oil passage 312, the side of the brake chamber 11 that is connected to the oil pump chamber 12 is connected to the other side of the brake chamber 11. When an excessive pressure difference occurs on both sides of the brake chamber 11, the oil in the side of the brake chamber 11 away from the oil pump chamber 12 can flow along the second oil passage 312 to the side of the brake chamber 11 with lower pressure, thus avoiding blockage.

[0067] In some embodiments, such as Figure 2 As shown, there are multiple brake pads 33, which are arranged at intervals along the first direction A. A receiving space is defined between two adjacent brake pads 33, and friction pads 32 are correspondingly disposed within the receiving space. This makes the braking assembly 30 brake the rotor shaft 21 more quickly and reliably.

[0068] Specifically, each friction plate 32 is provided with an inner spline 321 for sliding connection with the outer spline 311 of the rotating part 31, and the two sets of keyways of each friction plate 32 are correspondingly arranged with the two sets of keyways of the other friction plate 32, so that the first oil passage 322 formed on each friction plate 32 is opposite to the first oil passage 322 formed on the adjacent friction plate 32 along the first direction A.

[0069] In one embodiment, such as Figure 2 As shown, there are 5 brake pads 33 and 4 friction pads 32. In other embodiments, the number of brake pads 33 and friction pads 32 may be set differently according to usage requirements, and this is not limited here.

[0070] In order to move the brake pad 33 along the first direction A toward the side closer to the rotor shaft 21, in some embodiments, such as Figure 1 As shown, the intermediate shaft brake 100 also includes a piston assembly 40. The piston assembly 40 is located at the end of the brake chamber 11 away from the oil pump chamber 12 along the first direction A, and abuts against the brake pad 33 on the side of the brake pad 33 away from the oil pump chamber 12 along the first direction A. The piston assembly 40 is slidably connected to the inner wall of the housing 10 along the first direction A, dividing the housing 10 into a first chamber 111 and a second chamber 112 arranged sequentially along the first direction A and not communicating with each other. The housing 10 has an air inlet (not shown) communicating with the first chamber 111, and the brake assembly 30 is located in the second chamber 112. Thus, when air enters through the air inlet, it pushes the piston assembly 40 to move along the first direction A toward the side closer to the brake assembly 30, thereby pushing the brake pad 33 toward the side closer to the rotor shaft 21, causing the brake pad 33 to abut against the friction plate 32, thus reducing the rotational speed of the rotating part 31 and the rotor shaft 21.

[0071] In some embodiments, such as Figure 1 As shown, the piston assembly 40 includes a piston body 41 that movably passes through the brake chamber 11 along a first direction A, and a seal 42 disposed at one end of the piston body 41 near the brake assembly 30. The seal 42 is sealed to the inner wall of the housing 10 and divides the brake chamber 11 into a first chamber 111 and a second chamber 112. In this way, the pressure in the first chamber 111 increases when air is introduced through the air inlet, ensuring that the piston assembly 40 can move towards the side closer to the brake pad 33 and preventing oil leakage into the first chamber 111.

[0072] In some embodiments, such as Figure 1-2As shown, the intermediate shaft brake 100 also includes a first elastic element 50. One end of the first elastic element 50 is connected to the end of the rotating part 31 away from the rotor shaft 21, and the other end of the first elastic element 50 abuts against the piston assembly 40 along a first direction A. The first elastic element 50 is configured to provide a spring force that moves the piston assembly 40 along the first direction A away from the brake pad 33. Thus, when it is necessary to release the brake, the gas in the first chamber 111 is discharged from the air inlet, and the piston assembly 40 moves away from the brake pad 33 under the spring force of the first elastic element 50, so that the brake pad 33 no longer presses against the friction plate 32, thereby releasing the brake on the rotating part 31 and the rotor shaft 21.

[0073] In some embodiments, such as Figure 3 As shown, the housing 10 is also provided with a pressure relief channel 16 that communicates with the oil inlet 13 and the oil outlet 14 respectively. The intermediate shaft brake 100 also includes a pressure relief valve 60 disposed in the pressure relief channel 16. The pressure relief valve 60 is configured to connect the oil inlet 13 to the oil outlet 14 through the pressure relief channel 16 when the pressure at the oil inlet 13 is greater than a preset pressure difference. It should be noted that during the operation of the oil pump 20, oil may accumulate at the oil inlet 13 due to poor oil flow or excessively fast oil flow, resulting in high pressure and blockage. Therefore, by setting the pressure relief valve 60, when the pressure difference between the oil inlet 13 and the oil outlet 14 is greater than the preset pressure difference, the pressure relief valve 60 opens, allowing the oil inlet 13 to communicate with the oil outlet 14 through the pressure relief channel 16, thereby preventing the oil inlet 13 from being blocked due to excessive pressure.

[0074] Specifically, such as Figure 3As shown, the pressure relief channel 16 includes a first pressure relief channel 161 with one end connected to the oil inlet 13, and a first pressure relief channel 162 with one end connected to the periphery of the first pressure relief channel 161. The first pressure relief channel 161 and the first pressure relief channel 162 are arranged at an angle, and the end of the first pressure relief channel 162 away from the first pressure relief channel 161 is connected to the oil outlet 14. The pressure relief valve 60 includes a second elastic member 61 that is movably inserted through the first pressure relief channel 161 along its extension direction, and a sealing member 62 disposed at the end of the second elastic member 61 near the oil inlet 13. The second elastic member 61 can provide a spring force to move the sealing member 62 along the extension direction of the first pressure relief channel 161 toward the end near the oil inlet 13, so that the sealing member 62 blocks the end of the first pressure relief channel 161 connected to the oil inlet 13. When the pressure difference between the inlet 13 and the outlet 14 is greater than a preset pressure difference, the pressure at the inlet 13 pushes the sealing member 62 to move along the extension direction of the first pressure relief channel 161 towards the side closer to the second elastic member 61, compressing the second elastic member 61. This allows the inlet 13 to connect with the first pressure relief channel 162 through the first pressure relief channel 161, thereby connecting with the outlet 14, allowing excess oil at the inlet 13 to flow to the outlet 14. When the pressure difference between the inlet 13 and the outlet 14 is less than or equal to the preset pressure difference, the sealing member 62, under the elastic force of the second elastic member 61, seals the end of the first pressure relief channel 161 that connects to the inlet 13.

[0075] Furthermore, such as Figure 3 As shown, the pressure relief valve 60 also includes an adjusting member 63 that is movably inserted through the end of the first pressure relief channel 161 away from the oil inlet 13 along the extension direction of the first pressure relief channel 161. The end of the second elastic member 61 away from the oil inlet 13 abuts against the end of the adjusting member 63 near the oil inlet 13 along the extension direction of the first pressure relief channel 161. The other end of the adjusting member 63 is inserted through the housing 10, and the adjusting member 63 can move relative to the housing 10 along the extension direction of the first pressure relief channel 161 to adjust the initial compression of the second elastic member 61, thereby adjusting the preset pressure difference value.

[0076] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An intermediate shaft brake, characterized in that, include: The housing has a brake chamber and an oil pump chamber arranged sequentially and communicating with each other along a first direction. The housing has an oil inlet communicating with the brake chamber and an oil outlet communicating with the oil pump chamber. An oil pump is disposed within the oil pump chamber. The oil pump includes a rotor shaft passing through the oil pump chamber along the first direction. The rotor shaft is rotatable relative to the housing about a first rotating axis parallel to the first direction. One end of the rotor shaft away from the brake chamber extends out of the housing and is used to connect to an intermediate shaft. The oil pump is configured to discharge oil from the oil pump chamber through the oil outlet when the rotor shaft rotates about the first rotating axis. as well as A braking assembly is disposed within the braking chamber and connected to the rotor shaft; the braking assembly is used to reduce the rotational speed of the rotor shaft. The sidewall of the oil pump chamber is recessed radially into the housing along the rotor shaft to form a first oil inlet channel, and the sidewall of the brake chamber is recessed radially into the housing along the rotor shaft to form a second oil inlet channel. Both the first oil inlet channel and the second oil inlet channel extend along the first direction. One end of the first oil inlet channel is connected to the oil inlet, and one end of the second oil inlet channel is connected to the other end of the first oil inlet channel.

2. The intermediate shaft brake according to claim 1, characterized in that, The oil pump also includes an inner rotor fixedly sleeved on the rotor shaft, and an outer rotor spaced apart from the inner rotor. The outer rotor is capable of rotating relative to the housing around a second axis that is parallel to and spaced apart from the first axis while the inner rotor rotates around the first axis. The inner rotor partially meshes with the outer rotor and divides the outer rotor into multiple cavities. Each cavity penetrates the outer rotor along the first direction and connects the oil pump cavity and the brake cavity. The inner rotor and the outer rotor cooperate with each other so that when the inner rotor rotates around the first rotating shaft, the oil in the cavity connected to the oil outlet is pumped out of the oil outlet, and the oil in the brake cavity is drawn into another cavity.

3. The intermediate shaft brake according to claim 1, characterized in that, The braking assembly includes a rotating part, a friction pad, and a brake pad; The rotating part is connected to one end of the rotor shaft near the brake chamber; The friction plate is slidably sleeved on the outside of the rotating part along the first direction; The brake pad is sleeved on the outside of the rotating part and spaced apart from the rotating part along the radial direction of the rotating part. The brake pad is spaced apart from the friction pad along the first direction, and the brake pad can move relative to the rotating part towards the side closer to the rotor shaft along the first direction to abut against the friction pad and thereby reduce the rotational speed of the rotor shaft.

4. The intermediate shaft brake according to claim 3, characterized in that, The outer peripheral wall of the rotating part is provided with an external spline, and the inner peripheral wall of the friction plate is provided with an internal spline. The external spline is slidably connected to the internal spline along the first direction.

5. The intermediate shaft brake according to claim 4, characterized in that, The internal spline defines a keyway between each pair of adjacent teeth. All the keyways of the internal spline are divided into two groups, each group including at least one keyway of the internal spline. The keyways in one group correspond one-to-one with the teeth of the external spline, and the keyways in the other group form a first oil passage.

6. The intermediate shaft brake according to claim 3, characterized in that, The number of brake pads is multiple, and the multiple brake pads are arranged at intervals along the first direction. An accommodating space is defined between two adjacent brake pads, and the friction pads are correspondingly disposed in the accommodating space.

7. The intermediate shaft brake according to claim 3, characterized in that, The wall of the braking chamber is provided with a positioning element that extends longitudinally along the first direction. The outer peripheral wall of the brake pad is recessed into the brake pad along the radial direction of the rotating part to form a positioning groove, and the positioning member is slidably connected to the positioning groove along the first direction.

8. The intermediate shaft brake according to claim 3, characterized in that, The rotating part is provided with a second oil passage that runs through the rotating part along the first direction.

9. The intermediate shaft brake according to claim 3, characterized in that, The intermediate shaft brake also includes a piston assembly; The piston assembly is located at one end of the brake chamber away from the oil pump chamber along the first direction, and abuts against the brake pad on the side away from the oil pump chamber along the first direction. The piston assembly is slidably connected to the inner wall of the housing along the first direction, and divides the housing into a first chamber and a second chamber arranged sequentially along the first direction and not communicating with each other. The housing is provided with an air inlet communicating with the first chamber, and the brake assembly is located in the second chamber.

10. The intermediate shaft brake according to claim 9, characterized in that, The intermediate shaft brake also includes a first elastic element; One end of the first elastic member is connected to the end of the rotating part away from the rotor shaft, and the other end of the first elastic member abuts against the piston assembly along the first direction. The first elastic member is configured to provide a spring force that moves the piston assembly along the first direction away from the brake pad.

11. The intermediate shaft brake according to claim 9, characterized in that, The piston assembly includes a piston body that is movably disposed within the brake chamber along the first direction, and a seal disposed at one end of the piston body near the brake assembly. The seal is sealed to the inner wall of the housing and divides the brake chamber into a first chamber and a second chamber.

12. The intermediate shaft brake according to any one of claims 1 to 11, characterized in that, The housing is also provided with pressure relief channels that are respectively connected to the oil inlet and the oil outlet; The intermediate shaft brake also includes a pressure relief valve disposed in the pressure relief channel. The pressure relief valve is configured to connect the oil inlet to the oil outlet through the pressure relief channel when the pressure difference between the oil inlet and the oil outlet is greater than a preset pressure difference.

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