Coreless brush motor and gear motor system

Abstract

The utility model relates to the technical field of motors, in particular to a hollow cup brush motor and gear motor system, which comprises a casing, two bearings, a stator assembly and an armature cup assembly, a first mounting hole and a second mounting hole are correspondingly arranged at the closed ends of a cover body and the casing, and the two bearings are respectively mounted in the first mounting hole and the second mounting hole. A first mounting gap is formed between the peripheral side of the coil cup and the inner wall of the mounting cavity, the commutator is inserted into one end, close to the cover body, of the coil cup, the rotating shaft penetrates through the stator assembly and the commutator, the two ends of the rotating shaft are rotationally connected to the two bearings respectively, and at least one end, close to the cover body, of the rotating shaft is an open bearing; and the first mounting gap is communicated with the external working environment. When the hollow cup brush gear motor works in an oil bath environment, the pressure inside and outside the motor can be kept balanced, the running state without pressure difference is achieved, the working load is reduced, the working efficiency is improved, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a hollow cup brushed motor and a geared motor system. Background Technology

[0002] Petroleum exploration refers to the process of finding and identifying oil and gas resources by using various exploration equipment to understand the underground geological conditions. During the process of petroleum exploration, the operating depth can reach thousands of meters, the operating environment is high-temperature and closed, and the motors used in the exploration equipment need to be applied to the high-temperature and high-pressure oil bath environment.

[0003] Existing motors operate in environments with high temperature and high pressure, while their internal environment is at normal pressure and temperature due to the sealed nature of their structure. This results in a significant pressure and temperature difference between the inside and outside of the motor, greatly increasing the additional operating load and thus reducing the motor's efficiency and lifespan. Utility Model Content

[0004] The main purpose of this invention is to propose a hollow cup brushed motor, which aims to solve the problems of high operating load, low working efficiency and low service life of existing motors used in oil exploration equipment.

[0005] To solve the above problems, this utility model proposes a hollow cup brushed motor, comprising:

[0006] The housing includes a shell, a cover, and a brush. The shell forms a mounting cavity with one end open and the other end closed. The cover covers the opening of the mounting cavity, and the brush is inserted into the cover. The closed ends of the cover and the shell are respectively provided with a first mounting hole and a second mounting groove communicating with the mounting cavity.

[0007] Two bearings are respectively installed in the first mounting hole and the second mounting groove;

[0008] Stator assembly, the stator assembly being mounted within the mounting cavity; and

[0009] An armature cup assembly includes a coil cup, a commutator, and a rotating shaft. The coil cup is installed in the mounting cavity and surrounds the outer periphery of the stator assembly. A first mounting gap is formed between the outer periphery of the coil cup and the inner wall of the mounting cavity. The commutator is inserted into one end of the coil cup near the cover. The rotating shaft passes through the middle of the stator assembly and the commutator, and its two ends are rotatably connected to the two bearings respectively.

[0010] At least the bearing located in the first mounting hole is an open bearing, so that the first mounting gap is in communication with the external working environment.

[0011] In one embodiment, the open bearing includes an inner ring, an outer ring, and a plurality of balls. The outer ring is press-fitted into the inner wall of the first mounting hole, the inner ring is sleeved on the rotating shaft, and the plurality of balls are intermittently and tactilely connected between the inner ring and the outer ring.

[0012] The first installation gap is connected to the external working environment through the installation interval between two adjacent balls.

[0013] In one embodiment, the cover has a first mounting groove, the first mounting hole is formed at the bottom of the first mounting groove, the open bearing is installed in the first mounting groove, and the plurality of mounting intervals correspond to and communicate with the first mounting hole.

[0014] In one embodiment, a second mounting gap is formed between the stator assembly and the rotating shaft, and the bearing located in the second mounting groove is also an open bearing, so that the second mounting gap is connected to the external working environment.

[0015] In one embodiment, the housing includes an outer shell and an inner shell. The outer shell has openings at both ends. The inner shell includes a cover plate and a mounting cylinder. The cover plate is installed at the end of the outer shell away from the cover plate and surrounds the outer shell to form the mounting cavity. The mounting cylinder is connected to the end face of the cover plate facing the mounting cavity and is located inside the mounting cavity. The stator assembly is sleeved on the outer periphery of the mounting cylinder. The mounting cylinder has a through hole, and the rotating shaft passes through the through hole.

[0016] A second mounting gap is formed between the rotating shaft and the inner wall of the through hole. A second mounting groove is opened in the cover plate. The bottom of the second mounting groove is connected to the second mounting gap, so that the second mounting gap is connected to the external working environment through the mounting interval between two adjacent balls.

[0017] In one embodiment, the bottom of the second mounting groove is provided with a clearance groove, and a flow gap is formed between the end face of the open bearing facing the bottom of the second mounting groove and the bottom of the clearance groove. The second mounting gap is connected to the external working environment through the flow gap and the open bearing.

[0018] In one embodiment, the hollow cup brushed motor further includes a positioning ring, which is sleeved on the end of the rotating shaft away from the cover and abuts against the end face of the open bearing opposite to the bottom of the second mounting groove.

[0019] And / or, the hollow cup brushed motor further includes a retaining ring, which is sleeved on one end of the rotating shaft near the cover and abuts against the end face of another open bearing opposite to the bottom of the first mounting groove.

[0020] In one embodiment, the outer casing and the cover plate are detachably connected.

[0021] This utility model also proposes a geared motor system, including a hollow cup brushed motor and a reducer. The hollow cup brushed motor is as described above, and the reducer is installed at the end of the hollow cup brushed motor away from the cover.

[0022] In one embodiment, the reducer has a plurality of pressure relief holes spaced apart on its outer periphery to connect the inside of the reducer with the external working environment.

[0023] This utility model proposes a hollow cup brushed motor, including a housing, two bearings, a stator assembly, and an armature cup assembly. The housing forms a mounting cavity with one open end and one closed end. A cover is fitted onto the opening of the mounting cavity, and the brush is inserted into the cover. The closed ends of the cover and the housing are respectively provided with a first mounting hole and a second mounting hole. The two bearings are respectively installed in the first mounting hole and the second mounting hole. The stator assembly is installed in the mounting cavity. The armature cup assembly includes a coil cup, a commutator, and a shaft. The coil cup is installed in the mounting cavity and sleeved on the outer periphery of the stator assembly. The outer periphery of the coil cup is connected to the mounting cavity. The inner wall of the cavity has a first installation gap. The commutator is inserted into the end of the coil cup near the cover. The shaft passes through the stator assembly and the commutator, and its two ends are rotatably connected to two bearings respectively. At least the bearing near the cover is an open bearing, so that the first installation gap is connected to the external working environment. This allows the pressure inside and outside the hollow cup brushed geared motor to remain balanced when it works in an oil bath environment, achieving a pressure difference-free operating state. This reduces the workload of the hollow cup brushed motor and improves the motor's working efficiency and service life. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of an embodiment of the hollow cup brushed motor of this utility model;

[0026] Figure 2 for Figure 1 A structural schematic diagram from another perspective of the embodiment;

[0027] Figure 3 for Figure 2 Exploded view of part of the structure in the Chinese embodiment;

[0028] Figure 4 for Figure 1 A cross-sectional view of the embodiment;

[0029] Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point A;

[0030] Figure 6 This is a schematic diagram of the structure of an embodiment of the geared motor system of this utility model.

[0031] Explanation of icon numbers:

[0032] 100. Hollow cup brushed motor; 10. Housing; 11. Shell; 11a. Mounting cavity; 111. Outer shell; 112. Inner shell; 1121. Cover plate; 1122. Mounting cylinder; 1123. Second mounting groove; 12. Cover body; 121. First mounting hole; 122. First mounting groove; 13. Brush; 20. Open bearing; 30. Stator assembly; 40. Armature cup assembly; 41. Coil cup; 42. Commutator; 43. Shaft; 50. Clearance groove; 60. Positioning ring; 70. Retaining ring; 200. Reducer; 201. Pressure relief hole.

[0033] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] Petroleum exploration refers to the process of finding and identifying oil and gas resources by using various exploration equipment to understand the underground geological conditions. During the petroleum exploration process, the operating depth can reach thousands of meters, the operating environment is high-temperature and closed, and the motors used in the exploration equipment need to be used in a high-temperature and high-pressure oil bath environment. However, the external environment of the existing motors is high-temperature and high-pressure, while the internal environment is at normal pressure and temperature due to the sealed structure of the motor. This results in a huge pressure difference and temperature difference between the inside and outside of the motor, which greatly increases the additional operating load of the motor, thereby reducing the working efficiency and service life of the motor.

[0038] To address the aforementioned problems, this utility model proposes a hollow cup brushed motor, aiming to solve the issues of high operating load, low working efficiency, and low service life of existing motors used in oil exploration equipment.

[0039] like Figures 1 to 4 In one embodiment, the hollow cup brushed motor 100 includes a housing 10, two bearings, a stator assembly 30, and an armature cup assembly 40. The housing 11 forms a mounting cavity 11a with one end open and the other closed. A cover 12 covers the opening of the mounting cavity 11a, and a brush 13 is inserted into the cover 12. The closed ends of the cover 12 and the housing 11 are respectively provided with a first mounting hole 121 and a second mounting groove 1123 communicating with the mounting cavity 11a. The two bearings are respectively mounted in the first mounting hole 121 and the second mounting groove 1123. The stator assembly 30 is mounted in the mounting cavity 11a. The pivot cup assembly 40 includes a coil cup 41, a commutator 42, and a rotating shaft 43. The coil cup 41 is installed in the mounting cavity 11a and sleeved on the outer periphery of the stator assembly 30. The outer periphery of the coil cup 41 and the inner wall of the mounting cavity 11a form a first mounting gap. The commutator 42 is inserted into the end of the coil cup 41 near the cover 12. The rotating shaft 43 passes through the middle of the stator assembly 30 and the commutator 42, and its two ends are rotatably connected to two bearings respectively. The bearing located at least in the first mounting hole 121 is an open bearing 20 so that the first mounting gap is connected to the external working environment.

[0040] In this embodiment, the housing 10 serves as the external protective structure of the motor, comprising a shell 11, a cover 12, and brushes 13. The shell 11 is open at one end and closed at the other, forming a mounting cavity 11a, which accommodates other key components of the motor. The cover 12 is fitted over the opening of the mounting cavity 11a, serving to seal and protect the internal components. The brushes 13 are inserted into the cover 12, and their function is to cooperate with the commutator 42 to provide current to the coils in the armature cup assembly 40. The first mounting hole 121 and the second mounting groove 1123 at the closed ends of the cover 12 and the shell 11 are used to install bearings, providing support for the rotation of the shaft 43. Bearings are important components in the motor for achieving rotational connection; the two bearings are respectively installed in the first mounting hole 121 and the second mounting groove 1123, ensuring that the shaft 43 can rotate stably and smoothly. The stator assembly 30 is installed in the mounting cavity 11a, generating a magnetic field, which is an important part of the motor's energy conversion. The armature cup assembly 40 is the core component of the motor, enabling the conversion of electrical energy into mechanical energy. The coil cup 41 is installed within the mounting cavity 11a and fitted onto the outer periphery of the stator assembly 30. The initial mounting gap between the coil cup 41 and the inner wall of the mounting cavity 11a provides space for subsequent heat dissipation and pressure relief operations. The commutator 42 is inserted into the end of the coil cup 41 near the cover 12 to change the current direction, allowing the motor to rotate continuously. The rotating shaft 43 passes through the stator assembly 30 and the commutator 42, with both ends rotatably connected to bearings to transmit the motor's rotational power. At least the bearing near the cover 12 is an open bearing 20, allowing the initial mounting gap to communicate with the external working environment.

[0041] Since the hollow cup brushed motor 100 in this embodiment is used in a high-temperature and high-pressure oil bath environment, the external environmental pressure will increase significantly under these conditions. If the internal pressure of the motor and the external environment cannot be balanced, the huge pressure difference will exert additional forces on the various components of the motor. The presence of the open bearing 20 breaks this pressure isolation. Because the open bearing 20 has no sealing structure, it can directly connect the first installation gap inside the motor with the external oil bath working environment. The pressure inside the motor and the external oil bath environment can quickly become consistent, achieving a pressure-free operating state. This interconnected structure protects the internal components of the motor, such as the stator assembly 30 and the armature cup assembly 40, from the additional load caused by the pressure difference, thereby enabling more efficient and stable operation.

[0042] like Figures 1 to 4 In one embodiment, the open bearing 20 includes an inner ring, an outer ring, and a plurality of balls. The outer ring is press-fitted into the inner wall of the first mounting hole 121, the inner ring is sleeved on the rotating shaft 43, and the plurality of balls are intermittently connected between the inner ring and the outer ring.

[0043] The first installation gap is connected to the external working environment through the installation interval between two adjacent balls.

[0044] In this embodiment, the open bearing 20 mainly consists of an inner ring, an outer ring, and multiple balls. The inner ring is tightly fitted onto the rotating shaft 43 and rotates together with the rotating shaft 43, serving to connect the rotating shaft 43 with other bearing components. The outer ring is fixed to the inner wall of the first mounting hole 121 with a clearance fit, thereby making the entire bearing stably mounted on the motor cover 12. Multiple balls are spaced apart and roll between the inner and outer rings to reduce the frictional resistance between the inner and outer rings and ensure that the rotating shaft 43 can rotate smoothly.

[0045] This embodiment connects the first mounting gap to the external oil bath working environment by using the natural mounting gap formed between adjacent balls of the open bearing 20. The high-temperature, high-pressure external oil bath environment and the first mounting gap inside the motor can establish a pressure transmission path through these ball gaps. External pressure can be quickly transmitted to the inside of the motor through these tiny but numerous ball gaps, allowing the internal pressure of the motor to quickly reach equilibrium with the external environmental pressure, effectively reducing the additional stress on various motor components due to pressure differences. At the same time, no other additional transmission channels need to be designed, reducing the number of parts and lowering maintenance costs and difficulty.

[0046] like Figures 1 to 4 In one embodiment, the cover 12 has a first mounting groove 122, a first mounting hole 121 is formed at the bottom of the first mounting groove 122, an open bearing 20 is installed in the first mounting groove 122, and multiple mounting intervals correspond to and communicate with the first mounting hole 121.

[0047] In this embodiment, the cover 12 includes an integrated end cover and side plate. The side wall surrounds the outer periphery of the end cover and is inserted into the opening of the mounting cavity 11a, thereby allowing the end cover to cover the opening of the mounting cavity 11a. Simultaneously, the annular side wall has a hollow interior, providing a certain conductive space for the motor and the external oil bath working environment. The first mounting groove 122 is formed on the end cover, making the installation of the open bearing 20 more stable and precise, ensuring that the open bearing 20 will not shift during motor operation, thus guaranteeing the normal operation of the motor. At the same time, the first mounting groove 122 can effectively resist the external impact on the open bearing 20, preventing the bearing from loosening or being damaged, further improving the stability of motor operation.

[0048] The connection between the bottom of the first mounting groove 122 and the first mounting hole 121 makes the pressure transmission path more direct and efficient. The pressure inside and outside the motor can be balanced through the transmission space formed by the first mounting hole 121, the bottom of the mounting groove, the side plate enclosure, and the transmission path formed by the first mounting gap, ensuring the stability of the motor under complex working conditions.

[0049] like Figures 1 to 4 In one embodiment, a second mounting gap is formed between the stator assembly 30 and the rotating shaft 43, and the bearing located in the second mounting groove 1123 is also an open bearing 20, so that the second mounting gap is connected to the external working environment.

[0050] In this embodiment, the bearing located near the closed end of the housing 11, i.e., within the second mounting groove 1123, also employs an open bearing 20. This allows the second mounting gap to communicate with the external high-temperature, high-pressure oil bath working environment. The pressure from the external environment can directly act on the second mounting gap through the open bearing 20, thereby enabling the area inside the motor located between the stator assembly 30 and the shaft 43 to achieve pressure balance with the external environment. This completely eliminates potential stress caused by pressure differences in various areas inside the motor, reduces the additional burden on motor components, and makes the operation of each component of the motor more stable.

[0051] like Figures 1 to 4 In one embodiment, the housing 11 includes an outer shell 111 and an inner shell 112. The outer shell 111 is open at both ends. The inner shell 112 includes a cover plate 1121 and a mounting cylinder 1122. The cover plate 1121 is installed on the end of the outer shell 111 away from the cover body 12 and surrounds the outer shell 111 to form a mounting cavity 11a. The mounting cylinder 1122 is connected to the end face of the cover plate 1121 facing the mounting cavity 11a and is located inside the mounting cavity 11a. The stator assembly 30 is sleeved on the outer periphery of the mounting cylinder 1122. The mounting cylinder 1122 has a through hole, and the rotating shaft 43 passes through the through hole.

[0052] A second mounting gap is formed between the rotating shaft 43 and the inner wall of the through hole. A second mounting groove 1123 is opened on the cover plate 1121. The bottom of the second mounting groove 1123 is connected to the second mounting gap so that the second mounting gap is connected to the external working environment through the mounting interval between two adjacent balls.

[0053] In this embodiment, the housing 11 has a double-layer structure, wherein the outer shell 111 is a cylindrical structure with openings at both ends. The outer shell 111 provides a basic framework for the installation of the inner housing 112 and the layout of other components inside the motor, and protects the inside of the motor. By designing the outer shell 111 and the inner housing 112 separately, the processing difficulty of the housing 11 is greatly reduced, thereby improving production efficiency. The inner housing 112 consists of a cover plate 1121 and a mounting cylinder 1122. The cover plate 1121 is installed at the end of the outer shell 111 away from the cover body 12, and the two are tightly connected to form a mounting cavity 11a for accommodating the core components of the motor. The mounting sleeve 1122 is connected to the end face of the cover plate 1121 facing the mounting cavity 11a and is located within the mounting cavity 11a. The connection method can be welding or an integrated design. The stator assembly 30 is sleeved on the outer periphery of the mounting sleeve 1122 and bonded using a high-temperature and high-pressure resistant adhesive, such as epoxy resin, to ensure the connection stability between the stator assembly 30 and the mounting sleeve 1122. The mounting sleeve 1122 has a through hole along its axial direction for the shaft 43 to pass through, isolating the shaft 43 from the stator assembly 30. This double-layered housing 11 enhances the overall mechanical strength of the motor, better resisting external impacts and vibrations, and protecting the precision components inside the motor. Simultaneously, it optimizes the internal spatial layout of the motor, making the installation of each component more compact and rational.

[0054] The cover plate 1121 has a second mounting groove 1123 for mounting the open bearing 20. At the same time, the second mounting gap naturally formed between the rotating shaft 43 and the inner wall of the through hole is connected to the bottom of the second mounting groove 1123. This allows the pressure in the external high-temperature and high-pressure oil bath working environment to be transmitted to the second mounting gap through the mounting interval between two adjacent balls of the open bearing 20, thereby achieving internal and external pressure balance of the motor and ensuring the working stability of the motor.

[0055] like Figures 1 to 5 In one embodiment, the bottom of the second mounting groove 1123 is provided with a clearance groove 50. The end face of the open bearing 20 facing the bottom of the second mounting groove 1123 forms a flow gap with the bottom of the clearance groove 50. The second mounting gap is connected to the external working environment through the flow gap and the open bearing 20.

[0056] In this embodiment, a clearance groove 50 is added to the bottom of the second mounting groove 1123. When the open bearing 20 is installed in place, a flow gap is formed between the end face of the bearing near the bottom of the mounting groove and the bottom of the clearance groove 50. This flow gap widens the pressure transmission path, so that the internal pressure of the motor can reach a balance with the external high temperature and high pressure oil bath environment more quickly and evenly, further improving the stability of the motor.

[0057] like Figures 1 to 4In one embodiment, the hollow cup brushed motor 100 further includes a positioning ring 60, which is sleeved on the end of the rotating shaft 43 away from the cover 12 and abuts against the end face of an open bearing 20 away from the bottom of the second mounting groove 1123.

[0058] And / or, the hollow cup brushed motor 100 also includes a retaining ring 70, which is sleeved on one end of the rotating shaft 43 near the cover 12 and abuts against the end face of another open bearing 20 away from the bottom of the first mounting groove 122.

[0059] In this embodiment, the positioning ring 60 is fastened to the end of the rotating shaft 43 away from the cover 12 and abuts against the end face of the open bearing 20 near the closed end of the housing 11, away from the bottom of the second mounting groove 1123, so as to limit the axial displacement of the open bearing 20, ensure that the bearing always maintains a stable position during the operation of the motor, and improve the operating accuracy of the motor.

[0060] With or without the above embodiments, the retaining ring 70 is fastened to one end of the rotating shaft 43 near the cover 12 and abuts against the end face of the open bearing 20 near the cover 12 that is away from the bottom of the first mounting groove 122. Its function is the same as that of the positioning ring 60, and will not be described again here.

[0061] like Figures 1 to 4 In one embodiment, the outer shell 111 and the cover plate 1121 are detachably connected.

[0062] In this embodiment, the outer shell 111 and the inner shell 112 are connected in a detachable manner. For example, threaded holes are opened at corresponding positions on the outer shell 111 and the cover plate 1121, and the two are fixed by a threaded connection. In this example, the outer shell 111 and the inner shell 112 are designed as separate parts to facilitate disassembly and installation, reducing the difficulty of maintenance.

[0063] This utility model also proposes a geared motor system, including a hollow cup brushed motor 100 and a reducer 200. The reducer 200 is installed at the end of the hollow cup brushed motor 100 away from the cover 12. The specific structure of the hollow cup brushed motor 100 is as described in the above embodiments. Since the hollow cup brushed motor 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0064] Specifically, such as Figure 6 In this embodiment, a plurality of pressure relief holes 201 are provided at intervals on the outer periphery of the reducer 200 so that the interior of the reducer 200 is connected to the external working environment.

[0065] In this example, the design of multiple pressure relief holes is used to maintain the balance between the internal pressure of the reducer 200 and the external environmental pressure. This ensures that the reducer 200 operates continuously and efficiently under stable pressure conditions, and, in conjunction with the pressure relief structure of the hollow cup brushed motor 100, further improves the operational stability of the geared motor system.

[0066] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A hollow cup brush motor, characterized by, The hollow cup brushed motor includes: The housing includes a shell, a cover, and a brush. The shell forms a mounting cavity with one end open and the other end closed. The cover covers the opening of the mounting cavity, and the brush is inserted into the cover. The closed ends of the cover and the shell are respectively provided with a first mounting hole and a second mounting groove communicating with the mounting cavity. Two bearings are respectively installed in the first mounting hole and the second mounting groove; Stator assembly, the stator assembly being mounted within the mounting cavity; and An armature cup assembly includes a coil cup, a commutator, and a rotating shaft. The coil cup is installed in the mounting cavity and surrounds the outer periphery of the stator assembly. A first mounting gap is formed between the outer periphery of the coil cup and the inner wall of the mounting cavity. The commutator is inserted into one end of the coil cup near the cover. The rotating shaft passes through the middle of the stator assembly and the commutator, and its two ends are rotatably connected to the two bearings respectively. At least the bearing located in the first mounting hole is an open bearing, so that the first mounting gap is in communication with the external working environment.

2. The hollow cup brush motor of claim 1, wherein, The open bearing includes an inner ring, an outer ring, and a plurality of balls. The outer ring is press-fitted into the inner wall of the first mounting hole, the inner ring is sleeved on the rotating shaft, and the plurality of balls are intermittently connected between the inner ring and the outer ring. The first installation gap is connected to the external working environment through the installation interval between two adjacent balls.

3. The hollow cup brush motor of claim 2, wherein, The cover has a first mounting groove, the first mounting hole is opened at the bottom of the first mounting groove, the open bearing is installed in the first mounting groove, and the plurality of mounting intervals correspond to and are connected to the first mounting hole.

4. The hollow cup brush motor of claim 3, wherein, A second mounting gap is formed between the stator assembly and the rotating shaft, and the bearing located in the second mounting groove is also an open bearing, so that the second mounting gap is connected to the external working environment.

5. The hollow cup brush motor of claim 4, wherein, The housing includes an outer shell and an inner shell. The outer shell has openings at both ends. The inner shell includes a cover plate and a mounting cylinder. The cover plate is installed at the end of the outer shell away from the cover plate and forms the mounting cavity with the outer shell. The mounting cylinder is connected to the end face of the cover plate facing the mounting cavity and is located inside the mounting cavity. The stator assembly is sleeved on the outer periphery of the mounting cylinder. The mounting cylinder has a through hole, and the rotating shaft passes through the through hole. A second mounting gap is formed between the rotating shaft and the inner wall of the through hole. A second mounting groove is opened in the cover plate. The bottom of the second mounting groove is connected to the second mounting gap, so that the second mounting gap is connected to the external working environment through the mounting interval between two adjacent balls.

6. The hollow cup brush motor of claim 5, wherein, The bottom of the second mounting groove is provided with a clearance groove. The end face of the open bearing facing the bottom of the second mounting groove forms a flow gap with the bottom of the clearance groove. The second mounting gap is connected to the external working environment through the flow gap and the open bearing.

7. The hollow cup brush motor of claim 5, wherein, The hollow cup brushed motor also includes a positioning ring, which is sleeved on the end of the rotating shaft away from the cover and abuts against the end face of the open bearing opposite to the bottom of the second mounting groove. And / or, the hollow cup brushed motor further includes a retaining ring, which is sleeved on one end of the rotating shaft near the cover and abuts against the end face of another open bearing opposite to the bottom of the first mounting groove.

8. The hollow cup brush motor of claim 5, wherein, The outer shell and the cover plate are detachably connected.

9. A reduced speed motor system characterized by, The geared motor system includes a hollow cup brushed motor and a reducer. The hollow cup brushed motor is a hollow cup brushed motor as described in any one of claims 1 to 8. The reducer is installed at the end of the hollow cup brushed motor away from the cover.

10. The reduction motor system of claim 9, wherein, The reducer has multiple pressure relief holes spaced apart on its outer periphery to connect the inside of the reducer with the external working environment.

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