Direct-drive motor integrated with oil discharge and dual-sealing structure

Abstract

The invention relates to a direct-drive motor integrated with an oil discharge and dual-sealing structure. The motor comprises a motor shell, the motor shell comprises a front end cover and a rear end cover which are matched with each other, and a stator and rotor cavity suitable for containing a stator and a rotor is formed between the front end cover and the rear end cover; the bearing seat is connected with the rear end cover, a bearing is arranged in a bearing chamber of the bearing seat, and a discharge oil way is formed along the bearing seat; the shaft sleeve is rotationally arranged on the motor shell; the main shaft is supported by a bearing, rotationally connected to the bearing seat and connected with the stator through a shaft sleeve; the first oil seal is arranged between the rear end cover and the main shaft; the second oil seal is arranged between the rear end cover and the shaft sleeve, an annular sealing cavity is formed between the first oil seal and the second oil seal, and the rear end cover is provided with an oil discharging hole channel communicated with the annular sealing cavity and the discharging oil way. The problem of oil leakage can be avoided, the structure is compact, and meanwhile high efficiency and high reliability are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of motor design and manufacturing technology, in particular to a direct drive motor integrated with oil discharge and double sealing structure. BACKGROUND

[0002] In traditional industrial equipment such as textile machinery, the driving scheme of "asynchronous motor, belt transmission, gear reducer" is commonly used. In order to ensure the lubrication and reliability of the gear reducer during long-term operation, lubricating oil is usually added inside the gear reducer. However, after long-term continuous operation of the equipment, the oil seal of the output shaft of the gear reducer is prone to sealing performance degradation due to factors such as wear, aging and assembly tolerance, which leads to leakage of lubricating oil along the output shaft.

[0003] In view of the above oil leakage problem, two passive coping methods are mainly adopted in the prior art: one is to install an oil suction pipe or an oil collection structure outside the gear box bearing chamber; the other is to keep the textile machine and the motor indirectly connected to achieve physical isolation to prevent oil from entering the motor. The above schemes have obvious deficiencies: on the one hand, the external oil suction or oil collection device occupies limited installation space of the equipment, making the overall structure complex and increasing the volume, which is not conducive to the compact design of the equipment; on the other hand, since the motor cannot be directly connected with the reducer or the main shaft, the transmission chain is long, resulting in low transmission efficiency.

[0004] In addition, the belt transmission method itself also has the problems of low transmission efficiency, usually less than 95%, easy to slip and lose rotation, and the need for regular tensioning and replacement, which not only increases the energy consumption of the equipment, but also significantly increases the maintenance cost.

[0005] The use of direct drive motor to replace the original "motor, belt, reducer" multi-stage transmission structure can effectively improve the transmission efficiency and simplify the overall structure. However, if the ordinary direct drive motor is directly applied to the working condition environment with the risk of oil leakage, the leaked oil is easy to invade the inside of the motor along the shaft extension direction, which poses a serious threat to the electromagnetic system and bearing system of the motor, and there is a high risk of operation. SUMMARY

[0006] Therefore, the present application provides a direct drive motor integrated with oil discharge and double sealing structure, which can avoid oil leakage problem and has compact structure, high efficiency and high reliability.

[0007] To solve the above technical problems, the present application provides a direct drive motor integrated with oil discharge and double sealing structure, comprising: A motor housing comprising a front end cover and a rear end cover cooperating with each other, a stator and rotor cavity adapted to accommodate the stator and rotor being formed between the front end cover and the rear end cover; A bearing housing is connected to the rear end cover. A bearing is installed in the bearing chamber of the bearing housing, and an oil discharge passage is provided along the bearing housing. The bushing is rotatably mounted on the motor housing; The main shaft is supported by the bearing and rotatably connected to the bearing housing; the main shaft is connected to the stator through the bushing. A first oil seal is disposed between the rear end cover and the main shaft; The second oil seal is disposed between the rear end cover and the bushing, and the first oil seal and the second oil seal form an annular sealing cavity. The rear end cover is provided with an oil drain channel that communicates with the annular sealing cavity and the oil drain passage respectively.

[0008] In one embodiment of the invention, the oil discharge passage extends axially along the bearing housing.

[0009] In one embodiment of the present invention, the oil drain channel is disposed at a downward angle in the oil drain passage.

[0010] In one embodiment of the present invention, the bearing housing is provided with a discharge hole communicating with the discharge oil passage.

[0011] In one embodiment of the invention, the discharge hole extends to the circumferential outer wall of the bearing housing.

[0012] In one embodiment of the present invention, the bushing includes a bushing body, an extension body extending radially along the bushing body, the extension body including a disc body, a first ring body extending axially toward one end of the disc body toward the rear end cover, the first ring body extending into the stator and rotor cavity and its outer peripheral wall being adapted to install the rotor, and the bushing body being provided with a second ring body extending axially in the disc body. The rear end cover extends an extension ring toward the space between the first ring body and the second ring body; The first oil seal is disposed between the inner peripheral wall of the extension ring and the main shaft and is directly opposite the end of the second ring body, and the second oil seal is disposed between the outer peripheral wall of the extension ring and the first ring body.

[0013] In one embodiment of the present invention, a mounting plate extends axially from one end of the disc body away from the rear end cover. The mounting plate and the surface of the adjacent bushing body form a mounting surface suitable for mounting a synchronous pulley. A fastener is provided in the middle of the synchronous pulley, passing through the bushing body and connected to the end of the main shaft.

[0014] In one embodiment of the present invention, the spindle and the bushing are engaged by a tapered surface.

[0015] In one embodiment of the present application, the outer end face of the bearing seat is provided with a mounting seat adapted to be connected with the end face of the textile machine.

[0016] The above technical solution of the present application has the following advantages compared with the prior art: The integrated oil discharge and double-sealing structure direct-drive motor of the present application directly embeds the oil discharge function in the motor body structure, cancels the external oil suction device and oil collecting device required in the traditional scheme, integrates the oil discharge and sealing functions with the motor structure, significantly optimizes the overall machine layout, effectively saves the installation space, and is especially suitable for the upgrade and modification scenarios of stock equipment with limited installation space.

[0017] The present application innovatively cooperates the active oil discharge structure with the double-sealing structure, timely drains and discharges the infiltrated oil through the oil discharge channel, avoids the retention and soaking of the oil in the sealing area or the key components, and at the same time, the double-sealing forms a double-protection mechanism of main sealing and standby sealing, significantly reduces the risk of oil intrusion into the motor interior due to the failure of a single oil seal, and greatly improves the overall operation reliability of the system.

[0018] The present application adopts the direct-drive transmission mode, saves the slip loss generated by the belt transmission and the meshing loss of the gear reduction box, makes the power transmission path more direct, and can improve the system comprehensive transmission efficiency by more than 5%, which has a significant energy-saving effect under long-term continuous operation conditions.

[0019] The present application reduces the initial configuration cost by reducing external additional devices, and effectively reduces the failure downtime caused by oil leakage through the active oil discharge and double-sealing structure, thereby reducing the maintenance frequency and significantly reducing the comprehensive operation and maintenance cost of the equipment in the whole life cycle.

[0020] The present application avoids the pollution of the surrounding environment, raw materials and products caused by the overflow of lubricating oil through the effective collection and directional discharge of the leaked oil, improves the workshop operation environment, and meets the development requirements of clean production and green manufacturing. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to make the content of the present application more easily understood, the present application will be further described in detail below according to the specific embodiments of the present application and in conjunction with the drawings.

[0022] Figure 1 is a sectional view of the integrated oil discharge and double-sealing structure direct-drive motor of the present application.

[0023] Figure 2 is a sectional view of the integrated oil discharge and double-sealing structure direct-drive motor of the present application. Figure 1 is a sectional view of the integrated oil discharge and double-sealing structure direct-drive motor of the present application.

[0024] Figure 3 is a sectional view of the integrated oil discharge and double-sealing structure direct-drive motor of the present application.

[0025] Figure 4 is the structural diagram of the bearing seat of the present application.

[0026] Figure 5 is the structural diagram of the shaft sleeve of the present application.

[0027] Explanation of the reference signs in the description: 1, motor housing; 11, front end cover; 111, oil discharge channel; 12, rear end cover; 121, extension ring; 13, stator and rotor cavity; 2, shaft sleeve; 21, shaft sleeve body; 22, extension body; 23, disc body; 24, first ring body; 25, second ring body; 26, mounting disc; 3, main shaft; 4, first oil seal; 5, second oil seal; 6, bearing seat; 61, oil discharge passage; 62, discharge hole; 7, annular sealing cavity; 8, mounting seat; 9, synchronous wheel; 91, fastener. DETAILED DESCRIPTION

[0028] The present application will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present application and implement it, but the embodiments are not limiting to the present application.

[0029] In the present application, if the direction (up, down, left, right, front and back) is described, it is only for the convenience of describing the technical solution of the present application, and is not indicative or suggestive of the technical features indicated must have a specific orientation, be constructed and operated in a specific orientation, therefore, cannot be understood as a limitation of the present application.

[0030] In the present application, the meaning of "several" is one or more, the meaning of "multiple" is two or more, "greater than", "less than", "exceeding" and the like are understood as not including the number; "above", "below", "within" and the like are understood as including the number. In the description of the present application, if "first", "second" are described, they are only used for the purpose of distinguishing technical features, and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0031] In the present application, unless otherwise explicitly defined, the words such as "arrange", "mount", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected, or they can be integrally formed; they can be mechanically connected, or electrically connected or capable of communicating with each other; they can be connected or interacted between two elements. The skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solutions.

[0032] Referring to Figures 1 to 3 The direct drive motor with integrated oil discharge and double sealing structure of the present application comprises: The motor housing 1 comprises a front end cover 11 and a rear end cover 12 which cooperate with each other, and a stator-rotor cavity 13 is formed between the front end cover 11 and the rear end cover 12 for accommodating the stator and the rotor; The bearing seat 6 is connected to the rear end cover 12, and a bearing is arranged in the bearing chamber of the bearing seat 6, and an oil discharge channel 61 is formed in the bearing seat 6; The shaft sleeve 2 is rotatably arranged in the motor housing 1; The main shaft 3 is rotatably connected to the bearing seat 6 through the bearing support, and the main shaft 3 is connected to the stator through the shaft sleeve 2; The first oil seal 4 is arranged between the rear end cover 12 and the main shaft 3; The second oil seal 5 is arranged between the rear end cover 12 and the shaft sleeve 2, and an annular sealing cavity 7 is formed between the first oil seal 4 and the second oil seal 5, and the rear end cover 12 is provided with an oil discharge channel 111 which communicates with the annular sealing cavity 7 and the oil discharge channel 61, respectively.

[0033] By integrating the oil discharge structure and the double sealing structure in the direct drive motor, the sealing, protection and oil discharge functions are uniformly arranged in the motor housing 1, the rear end cover 12 and the bearing seat 6, thereby realizing the highly integrated design of the motor body structure. This structure does not require additional external oil discharge devices or auxiliary sealing components, and while ensuring the compactness of the motor, it significantly improves the reliability and adaptability of the motor in long-term operation in an oil-contaminated environment, and is particularly suitable for applications directly connected to oil-rich equipment such as gearboxes.

[0034] The bearing is arranged in the bearing seat 6, and the oil discharge channel 61 is prearranged along the bearing seat 6, so that the oil entering the bearing seat 6 area can be discharged in time, avoiding the retention of oil in the bearing chamber. This design effectively reduces the negative impact of oil on the lubrication state and service life of the bearing, reduces the abnormal wear or heating problem of the bearing caused by oil pollution, and improves the running stability of the transmission system from the structural level.

[0035] In one embodiment, the oil discharge passage 61 extends axially along the bearing seat 6.

[0036] In one embodiment, the oil discharge hole 111 is downwardly inclined and arranged in the oil discharge passage 61. The oil discharge hole 111 is downwardly inclined and arranged in the oil discharge passage 61, so that the oil can automatically flow out under the action of gravity without relying on external suction or complex structure. This design enhances the self-adaptability and reliability of the oil discharge process, effectively preventing oil backflow or residue even in the case of equipment shutdown or low-speed operation.

[0037] In one embodiment, referring to Figure 4 The bearing seat 6 is provided with a discharge hole 62 communicating with the oil discharge passage 61.

[0038] In one embodiment, the discharge hole 62 extends to the circumferential outer wall of the bearing seat 6.

[0039] The bearing seat 6 is provided with a discharge hole 62 communicating with the oil discharge passage 61, and the discharge hole 62 is extended to the circumferential outer wall of the bearing seat 6, so that the discharged oil can be directly discharged to the external safe area of the motor. This structure avoids the secondary diffusion of oil in the motor, reduces the difficulty of cleaning and maintenance, and is beneficial to maintaining the cleanliness and maintainability of the motor installation environment.

[0040] In one embodiment, referring to Figure 5 The shaft sleeve 2 comprises a shaft sleeve body 21, an extension body 22 extending radially from the shaft sleeve body 21, the extension body 22 comprising a disc body 23, a first ring body 24 extending from one axial end of the disc body 23 towards the rear end cover 12, the first ring body 24 extending into the stator-rotor cavity 13 and its outer peripheral wall being adapted to mount the rotor, and the shaft sleeve body 21 being provided with a second ring body 25 extending axially from the disc body 23. The rear end cover 12 extends an extension ring 121 between the first ring body 24 and the second ring body 25. The first oil seal 4 is arranged between the inner peripheral wall of the extension ring 121 and the main shaft 3 and opposite to the end of the second ring body 25, and the second oil seal 5 is arranged between the outer peripheral wall of the extension ring 121 and the first ring body 24.

[0041] The shaft sleeve 2 adopts a composite structure of the shaft sleeve body 21 and the radial extension body 22, and through the cooperative arrangement of the disc body 23, the first ring body 24 and the second ring body 25, the rotor mounting position, the oil seal mounting position and the transmission connection area are reasonably partitioned in the axial direction. The first ring body 24 extends into the stator-rotor cavity 13 and is used for mounting the rotor, which is beneficial to ensuring the positioning accuracy of the rotor; the second ring body 25 provides a stable counter-sealing surface for the oil seal, effectively improving the assembly consistency and sealing reliability of the sealing structure.

[0042] The rear end cover 12 is provided with an extension ring 121 extending between the first ring body 24 and the second ring body 25, so that the first oil seal 4 and the second oil seal 5 are respectively mounted on the inner and outer circumferential walls of the extension ring 121, and a clear main sealing area and a safety sealing area are formed in structure. This arrangement makes the two oil seals have clear functional division in the axial and radial directions, avoids mutual interference, and is beneficial to realizing stable and reliable double sealing effect.

[0043] In one embodiment, the disc body 23 extends an installation disc 26 at an axial end away from the rear end cover 12, the installation disc 26 and the surface of the shaft sleeve body 21 adjacent thereto form an installation surface suitable for installing a synchronous wheel 9, and the synchronous wheel 9 is provided with a fastener 91 (such as a bolt) penetrating the shaft sleeve body 21 and connected with the end of the main shaft 3. The effective guarantee of the synchronism of the output end and the stability of the transmission reduces the transmission gap and the phase error.

[0044] In one embodiment, the main shaft 3 and the shaft sleeve 2 are connected by taper surface matching. Compared with ordinary cylindrical matching, the taper surface structure has self-centering ability and higher connection rigidity while transmitting torque. This structure can effectively reduce the radial runout, improve the stability of power transmission, and is convenient for assembly and disassembly, and is suitable for the high reliability connection requirements of direct drive motors and external loads.

[0045] In one embodiment, the outer end surface of the bearing seat 6 is provided with a mounting seat 8 suitable for being connected with the end surface of the textile machine. The motor can be directly used as a functional module to be integrated and installed with the textile equipment.

[0046] It should be noted that the first oil seal 4 is a main seal, which is located at the outermost side and close to the installation environment of the motor, and its main function is to directly block the oil splashing from the gear box of the equipment and the initial infiltration along the direction of the rotating shaft; after oil injection into the bearing chamber: The second oil seal 5 is a safety seal, which is arranged inside the first oil seal 4 and serves as a redundant protection structure, and its core function is to form a key secondary isolation barrier when the first oil seal 4 fails locally or oil accumulates under extreme working conditions, preventing oil from further invading the electromagnetic component area inside the motor.

[0047] An annular sealing cavity 7 is formed between the first oil seal 4 and the second oil seal 5, and the lower part of the annular sealing cavity 7 is in communication with the oil collecting cavity of the oil discharge passage 61.

[0048] This structural design achieves integrated sealing and drainage: any trace amount of oil that penetrates the first oil seal 4 will be blocked by the safety seal and temporarily retained in the annular sealing cavity 7. Then, under the action of gravity, it will be automatically discharged through the oil drain channel, effectively preventing the oil from accumulating between the two oil seals for a long time, thereby reducing the continuous pressure of the oil on the oil seal lip and significantly extending the overall service life of the sealing system.

[0049] In addition, this direct drive motor adopts an adsorption-type direct drive structure. The output end of the main shaft 3 directly connects to the load mechanical main shaft 3 through a tapered fit with the tapered sleeve 2, eliminating intermediate transmission mechanisms such as belts and gearboxes, achieving high-efficiency and high-rigidity direct power transmission, and significantly reducing transmission losses and system complexity.

[0050] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A direct drive motor integrated with oil discharge and double seal structure, characterized in that, The motor housing (1) comprises a front end cover (11) and a rear end cover (12) matched with each other, and a stator-rotor cavity (13) is formed between the front end cover (11) and the rear end cover (12) and is adapted to accommodate a stator and a rotor. The bearing seat (6) is connected with the rear end cover (12), a bearing is arranged in a bearing chamber of the bearing seat (6), and a discharge oil path (61) is formed in the bearing seat (6). The shaft sleeve (2) is rotationally arranged in the motor housing (1). The main shaft (3) is rotationally connected to the bearing seat (6) through the bearing and is connected to the stator through the shaft sleeve (2). The first oil seal (4) is arranged between the rear end cover (12) and the main shaft (3). The second oil seal (5) is arranged between the rear end cover (12) and the shaft sleeve (2), an annular sealing cavity (7) is formed between the first oil seal (4) and the second oil seal (5), and a discharge hole (111) is arranged on the rear end cover (12) and is in communication with the annular sealing cavity (7) and the discharge oil path (61), respectively. The discharge oil path (61) extends axially along the bearing seat (6).

2. The direct drive motor of claim 1, wherein the integrated oil discharge and double seal structure comprises a seal groove formed in the rotor core, a seal ring mounted in the seal groove, and a seal ring groove formed in the stator core. The discharge hole (111) is arranged on the discharge oil path (61) in a downward inclined manner.

3. The direct drive motor of claim 2, wherein the integrated oil drain and double seal structure comprises a first seal, a second seal, and a third seal. The bearing seat (6) is provided with a discharge hole (62) in communication with the discharge oil path (61).

4. The direct-drive motor with integrated oil drainage and double sealing structure according to claim 1, characterized in that, The discharge hole (62) extends to the circumferential outer wall of the bearing seat (6).

5. The direct drive motor of claim 4, wherein, The shaft sleeve (2) comprises a shaft sleeve body (21), an extension body (22) extending radially along the shaft sleeve body (21), the extension body (22) comprises a disc body (23), a first ring body (24) extending from one axial end of the disc body (23) towards the rear end cover (12), the first ring body (24) extends into the stator-rotor cavity (13) and the outer circumferential wall thereof is adapted to mount the rotor, and the shaft sleeve body (21) is provided with a second ring body (25) extending axially from the disc body (23).

6. The direct drive motor of claim 4, wherein the integrated oil drain and double seal structure comprises a seal groove formed in the rotor core, a seal ring mounted in the seal groove, and a seal ring groove formed in the stator core. The rear end cover (12) extends an extension ring (121) between the first ring body (24) and the second ring body (25). The first oil seal (4) is arranged between the inner circumferential wall of the extension ring (121) and the main shaft (3) and faces the end portion of the second ring body (25), and the second oil seal (5) is arranged between the outer circumferential wall of the extension ring (121) and the first ring body (24). The disc body (23) extends an installation disc (26) from one axial end thereof away from the rear end cover (12), the installation disc (26) and the surface of the shaft sleeve body (21) adjacent thereto form an installation surface adapted to mount a synchronous wheel (9), and the synchronous wheel (9) is provided with a fastener (91) penetrating through the shaft sleeve body (21) and connected to the end portion of the main shaft (3).

7. The direct drive motor of claim 6, wherein the integrated oil drain and double seal structure comprises a first seal, a second seal, and a third seal. The main shaft (3) and the shaft sleeve (2) are connected through a conical surface.

8. The direct drive motor of claim 6, wherein the integrated oil drain and double seal structure comprises a seal groove formed in the rotor core, a seal ring mounted in the seal groove, and a seal ring groove formed in the stator core. An installation seat (8) adapted to be connected with an end surface of a textile machine is mounted on the outer end surface of the bearing seat (6).

9. A direct-drive motor with integrated oil drainage and double sealing structure according to claim 1, characterized in that, ​

Images