Single support belt drive

Abstract

The utility model relates to pulley transmission technical field, concretely relates to a single support belt transmission device, and the body of bearing seat is rotatably provided with transmission shaft, one end of transmission shaft is out of the body and is connected with the shaft coupling, the side of body away from the shaft coupling extends out the cylindrical sleeve, the other end of transmission shaft is out of the sleeve, and the sleeve is rotatably connected with the pulley, the one end of pulley close to the body is coaxially provided with the isolating sleeve, and the outer periphery of isolating sleeve and the inner periphery of rotary seal ring abut, and rotary seal ring is connected with the body, the one end of pulley away from the body is connected with the end cap, and pulley is sealedly connected with the end cap, and the end cap is connected with transmission shaft, and the end face of end cap is equipped with the connecting hole, and the inner periphery of connecting hole and the outer periphery of transmission shaft are sealedly connected. The utility model forms effective sealing from the both ends of pulley, blocks the contaminant and enters the clearance between pulley and sleeve, guarantees lubrication environment stability, prolongs the service life of bearing, avoids the contaminant and leads to the decline of pulley and sleeve rotation cooperation precision.

Description

Technical Field

[0001] This utility model relates to the field of belt drive technology, specifically to a single-support belt drive device. Background Technology

[0002] In traditional single-support pulley systems, the motor output is rigidly connected to one end of the drive shaft via a coupling. The drive shaft is rotatably supported within a fixed bearing housing by a bearing assembly, while the other end of the drive shaft extends outside the bearing housing and is coaxially fixed to the pulley. When the motor starts, torque is transmitted to the drive shaft via the coupling, which in turn drives the pulley to rotate synchronously, ultimately transmitting power to the subsequent actuators. However, the belt, under tension, exerts a radial pressure on the pulley, causing the drive bearing to experience a large off-center load. This leads to abnormal friction in the bearing during operation, resulting in excessively high bearing temperature, accelerated bearing wear, and a shortened bearing life. It can also cause the drive shaft to misalign, affecting the coaxiality of the transmission system and reducing the accuracy of power transmission.

[0003] To address the shortcomings of traditional structures, patent CN202251843U discloses a belt pulley transmission device. This device rotatably supports the belt pulley on a sleeve via a bearing assembly, and the sleeve is fixedly connected to a base. Both ends of the transmission shaft pass through the sleeve, and the transmission shaft is rotatably connected to the sleeve. One end of the transmission shaft is connected to the output end of the motor, and the other end is fixedly connected to the belt pulley via an end cover, which serves as the torque transmission end.

[0004] However, this device lacks an effective sealing structure between the pulley and the sleeve. When applied to industrial equipment such as presses, contaminants such as metal shavings, dust, and cutting fluid droplets in the working environment can easily enter the gap between the pulley and the sleeve, directly contacting the bearing assembly supporting the pulley. This exacerbates bearing wear and corrosion, disrupts the bearing's lubrication environment, and significantly shortens bearing life. Furthermore, it may reduce the rotational fit accuracy between the pulley and the sleeve, causing problems such as transmission jamming and abnormal noises, making it difficult to meet the long-term stable operation requirements of equipment like presses. Utility Model Content

[0005] To address the problem that existing single-sided support pulley devices lack an effective sealing structure between the pulley and the sleeve, allowing contaminants from the working environment to easily enter the gap between the pulley and the sleeve, exacerbating bearing wear and corrosion, disrupting the bearing's lubrication environment, and significantly shortening bearing life, while also potentially causing a decrease in the rotational fit accuracy between the pulley and the sleeve, leading to transmission jamming, abnormal noise, and other issues, thus failing to meet the long-term stable operation requirements of equipment such as presses, this utility model provides a single-support belt drive device.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A single-support belt drive device includes a bearing housing, which includes a body. A drive shaft is rotatably mounted inside the body. One end of the drive shaft extends out of the body and is connected to a coupling. A cylindrical sleeve extends from the side of the body away from the coupling. The sleeve is coaxially mounted with the drive shaft. The other end of the drive shaft extends out of the sleeve. A pulley is rotatably mounted on the outer circumference of the sleeve. A cylindrical isolation sleeve is provided at the end of the pulley near the body. The pulley and the isolation sleeve are coaxially connected. The outer circumferential surface of the isolation sleeve abuts against the inner circumferential surface of a rotary sealing ring. The rotary sealing ring is fixedly connected to the body. The end of the pulley away from the body is fixedly connected to an end cover. The end face of the pulley and the end face of the end cover are sealed together. The end cover is fixedly connected to the drive shaft. The end face of the end cover has a connecting hole. The inner circumferential surface of the connecting hole is sealed together with the outer circumferential surface of the drive shaft.

[0007] By adopting the above structural design, an effective seal is formed from both ends of the pulley through a double sealing structure consisting of an isolation sleeve, a rotary sealing ring, and end caps. The rotary sealing ring abuts against the outer circumferential surface of the isolation sleeve, preventing contaminants from entering from the end of the pulley closest to the main body. The sealed connection between the end caps and the pulley and drive shaft prevents contaminants from entering from the end of the pulley furthest from the main body. This solves the problem of contaminants easily entering the gap between the pulley and the sleeve in existing technologies, avoids bearing wear and corrosion, ensures a stable lubrication environment, extends bearing service life, prevents a decrease in the rotational fit accuracy between the pulley and the sleeve caused by contaminants, prevents transmission jamming and abnormal noise, ensures the coaxiality of the transmission system, improves power transmission accuracy, and meets the long-term stable operation requirements of equipment such as presses.

[0008] In a preferred implementation of a single-support belt drive, the sleeve is rotatably connected to the pulley via a cylindrical roller bearing.

[0009] By adopting the above structural design, cylindrical roller bearings possess excellent radial load-bearing capacity, effectively withstanding the radial off-center load generated by the belt tension acting on the pulley. This reduces shaft misalignment caused by off-center loading, lowers abnormal bearing friction, prevents excessive bearing temperature, and further extends bearing service life. Compared to ordinary bearings, cylindrical roller bearings operate more smoothly under radial loads, improving rotational stability between the pulley and the sleeve, reducing vibration and noise during transmission, ensuring the overall smooth operation of the transmission system, and meeting the transmission stability requirements of industrial equipment such as presses.

[0010] As a preferred implementation of a single-support belt drive device, an annular gap one is provided between the inner circumferential surface of the pulley and the outer circumferential surface of the sleeve, and an annular gap two is provided between the inner circumferential surface of the isolation sleeve and the outer circumferential surface of the sleeve, with annular gap one and annular gap two communicating with each other; an oil injection hole is provided at the top of the main body, an oil outlet hole one is provided at the top of the outer circumferential surface of the sleeve, and an oil injection channel is provided inside the bearing housing, with the oil injection hole and oil outlet hole one communicating with each other through the oil injection channel.

[0011] With the above structural design, annular gap one and annular gap two are connected, which not only provides reasonable space for the relative rotation of the pulley and the sleeve, avoiding component interference, but also allows the subsequently added lubricating medium to flow smoothly within annular gap one and annular gap two, laying the foundation for the construction of the lubrication system and achieving a synergistic effect of sealing and lubrication. Secondly, through the oil injection hole on the top of the main body, the oil outlet hole one on the outer circumference of the sleeve, and the oil injection channel in the bearing housing, lubricating medium can be directly injected into the rotating mating parts between the pulley and the sleeve without disassembling the device, simplifying the lubrication operation process and reducing maintenance difficulty. Furthermore, lubricating medium can be replenished at any time, avoiding accelerated bearing wear due to insufficient lubrication, ensuring that the bearing is always in a good lubrication state, maintaining the efficient operation of the transmission system, and further extending the overall service life of the device.

[0012] In a preferred implementation of a single-support belt drive, the oil outlet is connected to either the first annular gap or the second annular gap.

[0013] By adopting the above structural design, oil outlet one is connected to either annular gap one or annular gap two, allowing the lubricating medium to be directly delivered to the critical rotational gaps between the pulley and the sleeve, and between the insulating sleeve and the sleeve. This ensures that the lubricating medium acts precisely on core components such as bearings, avoids waste of lubricating medium, and improves lubrication efficiency. Furthermore, regardless of whether oil outlet one is connected to annular gap one or annular gap two, the connection between annular gap one and annular gap two allows the lubricating medium to flow within both gaps, achieving comprehensive lubrication of all rotating contact parts between the pulley and the sleeve, ensuring that all components receive effective lubrication protection.

[0014] As a preferred implementation of a single-support belt drive device, the oil injection channel includes a vertical channel and a horizontal channel. The vertical channel is located inside the main body, and the horizontal channel is located inside the sleeve. The top end of the vertical channel is connected to the oil injection hole, the bottom end of the vertical channel is connected to one end of the horizontal channel, and the horizontal channel is connected to the oil outlet hole.

[0015] The above structural design comprises a vertical channel and a horizontal channel. The vertical channel extends vertically within the main body, while the horizontal channel extends horizontally within the sleeve, forming a clear and rational lubricant delivery path. This avoids excessive bends in the channel that could obstruct the flow of lubricant, ensuring smooth delivery of the lubricant from the injection port to the outlet port. Furthermore, the vertical channel is compatible with the main body structure, and the horizontal channel is compatible with the sleeve structure, allowing the lubricant channel to be cleverly integrated into the bearing housing without requiring additional external space. This maintains the overall compactness of the device and facilitates manufacturing, reducing production difficulty.

[0016] As a preferred implementation of a single-support belt drive device, the bottom of the inner wall of the main body is provided with an oil outlet hole two, and the main body is provided with a horizontally arranged oil outlet channel, one end of which is connected to the oil outlet hole two; a connecting oil passage is provided between the inner circumferential surface of the rotary sealing ring and the end face of the rotary sealing ring near the main body, the other end of the oil outlet channel is connected to the connecting oil passage, and the connecting oil passage is connected to the annular gap two.

[0017] By adopting the above structural design, waste lubricating medium or impurities in the annular gap can be smoothly discharged through the oil outlet hole two at the bottom of the inner wall of the main body, the horizontally arranged oil outlet channel, and the connecting oil passage on the rotating seal ring. This prevents waste lubricating medium from accumulating in the gap, which would reduce the lubrication effect, and also prevents impurities from wearing down parts, ensuring the cleanliness of the device's interior. Furthermore, the oil discharge structure works in conjunction with the oil injection structure to form a complete lubricating medium circulation system, facilitating regular replacement of the lubricating medium and ensuring a constant supply of fresh, clean lubricating medium to the device. This maintains a long-term stable lubrication environment and further extends the service life of bearings and other rotating parts.

[0018] As a preferred implementation of a single-support belt drive device, the connecting oil passage is L-shaped.

[0019] By adopting the above structural design, the L-shaped connecting oil passage can precisely adapt to the structural characteristics of the rotary seal ring. One end can connect with the inner circumferential surface of the rotary seal ring to align with the annular gap, and the other end can connect with the end face of the rotary seal ring near the main body to align with the oil outlet channel. This allows for the smooth flow of waste lubricating medium without compromising the sealing performance of the rotary seal ring. Furthermore, the L-shaped structure allows for efficient use of space within the rotary seal ring, eliminating the need for additional expansion of the rotary seal ring's volume. This ensures that the rotary seal ring can both perform its sealing function and integrate the oil drainage channel, guaranteeing the compactness of the overall device structure.

[0020] In a preferred embodiment of a single-support belt drive, the pulley and the isolation sleeve are fixedly connected by a screw, and the axis of the screw is parallel to the axis of the drive shaft.

[0021] With the above structural design, screw one can fix the pulley and the isolation sleeve along the axial direction of the device, avoiding excessive interference between the fixing force direction and the transmission direction. This ensures a firm connection between the pulley and the isolation sleeve, preventing relative displacement due to vibration during transmission, and guaranteeing the positional stability of the isolation sleeve in the sealing structure, thereby maintaining the sealing effect. Furthermore, the screw connection method is simple in structure, facilitating disassembly and replacement of the pulley or isolation sleeve during later maintenance, reducing maintenance costs. At the same time, the screw connection has high reliability and can withstand vibration and torque during long-term device operation, ensuring connection stability.

[0022] In a preferred embodiment of a single-support belt drive, the pulley and the end cover are fixedly connected by two screws, with the axis of the two screws being parallel to the axis of the drive shaft.

[0023] With the above structural design, the axis of screw two is parallel to the axis of the drive shaft, allowing for a tight axial fixation between the pulley and the end cover. This ensures a consistently tight seal between the pulley end face and the end cover end face, preventing gaps caused by loose connections and guaranteeing the sealing effect of the end cover. It also prevents contaminants from entering from the pulley end furthest from the main body. Furthermore, the robust screw connection ensures synchronous rotation between the end cover and the pulley, assisting the end cover in torque transmission and preventing relative slippage between the end cover and the pulley during torque transmission. This ensures the stability and reliability of power transmission, meeting the torque transmission requirements of the drive system.

[0024] In a preferred implementation of a single-support belt drive, the rotating seal ring is fixedly connected to the body by three screws, and the axis of the three screws is set parallel to the axis of the drive shaft.

[0025] With the above structural design, the axis of screw three is parallel to the axis of the drive shaft, which allows the rotating seal ring to be firmly fixed to the body axially. This ensures that there is no looseness between the rotating seal ring and the body, and that the inner circumferential surface of the rotating seal ring always maintains a tight contact with the outer circumferential surface of the isolation sleeve. This prevents seal failure due to displacement of the rotating seal ring and provides a stable foundation for the seal at the end of the device closest to the body. Furthermore, the fixing method of screw three effectively resists vibration during device operation, preventing the rotating seal ring from shifting or falling off under vibration, ensuring the long-term stable function of the sealing structure. At the same time, the screw connection facilitates future replacement and maintenance of the rotating seal ring, improving the maintainability of the device.

[0026] The beneficial effects of this utility model include: By employing a double-sealing structure consisting of an isolation sleeve, a rotary sealing ring, and end caps, an effective seal is formed from both ends of the pulley. The rotary sealing ring abuts against the outer circumference of the isolation sleeve, preventing contaminants from entering from the end of the pulley closest to the main body. The sealed connection between the end caps and the pulley and drive shaft prevents contaminants from entering from the end of the pulley furthest from the main body. This solves the problem of contaminants easily entering the gap between the pulley and the sleeve in existing technologies, avoiding bearing wear and corrosion, ensuring a stable lubrication environment, extending bearing life, preventing a decrease in the rotational fit accuracy between the pulley and the sleeve caused by contaminants, preventing transmission jamming and abnormal noise, ensuring the coaxiality of the transmission system, improving power transmission accuracy, and meeting the long-term stable operation requirements of equipment such as presses. Attached Figure Description

[0027] To more clearly illustrate the technical solution of this utility model, the drawings used in the description 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 these drawings without creative effort.

[0028] Figure 1 This is a cross-sectional structural diagram of a single-support belt drive device according to a specific embodiment of the present utility model; Figure 2 This is a top view of a single-support belt drive device according to a specific embodiment of the present utility model; Figure 3 This is a schematic diagram of the assembly structure of a single-support belt drive device in a specific embodiment of this utility model.

[0029] List of components and reference numerals: 1. Bearing housing; 101. Body; 102. Sleeve; 2. Drive shaft; 3. Pulley; 4. Isolation sleeve; 5. Rotary seal ring; 6. End cover; 601. Connecting hole; 7. Annular gap one; 8. Annular gap two; 9. Cylindrical roller bearing; 10. Oil injection hole; 11. Oil outlet one; 12. Oil injection channel; 1201. Vertical channel; 1202. Horizontal channel; 13. Oil outlet two; 14. Oil outlet channel; 15. Connecting oil passage; 16. Screw one; 17. Screw two; 18. Screw three; 19. Main motor; 20. Coupling. Detailed Implementation

[0030] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] Reference Figure 1-2 This embodiment proposes a single-support belt drive device, including a bearing housing 1, the bearing housing 1 including a body 101, and a drive shaft 2 rotatably mounted inside the body 101, combined with... Figure 3 During assembly, one end of the drive shaft 2 extends out of the body 101 and is connected to the main motor 19 via the coupling 20. A cylindrical sleeve 102 extends from the side of the body 101 away from the coupling 20. The sleeve 102 is coaxially arranged with the drive shaft 2. The other end of the drive shaft 2 extends out of the sleeve 102. The outer circumference of the sleeve 102 is rotatably connected to the pulley 3 via a cylindrical roller bearing 9.

[0032] Reference Figure 1 A cylindrical isolation sleeve 4 is provided at one end of the pulley 3 near the body 101. The pulley 3 and the isolation sleeve 4 are coaxially connected. The outer circumferential surface of the isolation sleeve 4 abuts against the inner circumferential surface of the rotary sealing ring 5. The rotary sealing ring 5 is fixedly connected to the body 101. The pulley 3 and the isolation sleeve 4 are fixedly connected by screw 16, the axis of which is parallel to the axis of the drive shaft 2. The rotary sealing ring 5 is fixedly connected to the body 101 by screw 318, the axis of which is parallel to the axis of the drive shaft 2.

[0033] Reference Figure 1 The end of the pulley 3 furthest from the main body 101 is fixedly connected to the end cover 6. The end face of the pulley 3 and the end face of the end cover 6 are sealed together. The end cover 6 is fixedly connected to the drive shaft 2. The end face of the end cover 6 is provided with a connecting hole 601. The inner circumferential surface of the connecting hole 601 is sealed together with the outer circumferential surface of the drive shaft 2. The pulley 3 and the end cover 6 are fixedly connected by a second screw 17. The axis of the second screw 17 is parallel to the axis of the drive shaft 2.

[0034] Reference Figure 1 An annular gap 7 is provided between the inner circumferential surface of the pulley 3 and the outer circumferential surface of the sleeve 102, and an annular gap 8 is provided between the inner circumferential surface of the isolation sleeve 4 and the outer circumferential surface of the sleeve 102. The annular gap 7 and the annular gap 8 are connected.

[0035] Reference Figure 1The main body 101 has an oil injection hole 10 at its top, and the outer circumferential surface of the sleeve 102 has an oil outlet hole 11 at its top. The oil outlet hole 11 is directly connected to the annular gap 7 and indirectly connected to the annular gap 8. The bearing seat 1 has an oil injection channel 12, and the oil injection hole 10 and the oil outlet hole 11 are connected through the oil injection channel 12. The oil injection channel 12 includes a vertical channel 1201 and a horizontal channel 1202. The vertical channel 1201 is located inside the main body 101, and the horizontal channel 1202 is located inside the sleeve 102. The top end of the vertical channel 1201 is connected to the oil injection hole 10, and the bottom end of the vertical channel 1201 is connected to one end of the horizontal channel 1202. The horizontal channel 1202 is connected to the oil outlet hole 11.

[0036] Reference Figure 1 The bottom of the inner wall of the body 101 is provided with an oil outlet hole 2 13. The body 101 is provided with a horizontally arranged oil outlet channel 14. One end of the oil outlet channel 14 is connected to the oil outlet hole 2 13. A connecting oil passage 15 is provided between the inner circumferential surface of the rotary sealing ring 5 and the end face of the rotary sealing ring 5 near the end of the body 101. The connecting oil passage 15 is L-shaped. The other end of the oil outlet channel 14 is connected to the connecting oil passage 15. The connecting oil passage 15 is connected to the annular gap 2 8.

[0037] Work process: After the main motor 19 starts, the torque is transmitted to one end of the transmission shaft 2 through the coupling 20, driving the transmission shaft 2 to rotate around its own axis within the body 101 of the bearing housing 1.

[0038] The end of the drive shaft 2 away from the coupling 20 extends out of the sleeve 102 and is fixedly connected to the end cover 6. The end cover 6 is also fixed to the end of the pulley 3 away from the body 101. As the drive shaft 2 rotates, the end cover 6 synchronously drives the pulley 3 to rotate around the outer circumference of the sleeve 102, realizing the transmission of torque from the drive shaft 2 to the pulley 3.

[0039] When pulley 3 rotates, it transmits power to the subsequent actuator (such as the transmission components of a press) through the outer belt, completing the entire power transmission process. During this process, sleeve 102 is rotatably connected to pulley 3 through cylindrical roller bearing 9.

[0040] A coaxially connected isolation sleeve 4 is provided at one end of the pulley 3 near the body 101. The outer circumferential surface of the isolation sleeve 4 abuts tightly against the inner circumferential surface of the rotary sealing ring 5 fixed on the body 101. When the pulley 3 drives the isolation sleeve 4 to rotate, a dynamic seal is formed between the rotary sealing ring 5 and the isolation sleeve 4, preventing contaminants such as metal shavings, dust, and cutting fluid droplets in the working environment from entering the mating area of ​​the sleeve 102 and the pulley 3 through the gap between the pulley 3 and the body 101.

[0041] The end of the pulley 3 furthest from the body 101 is fixedly connected to the end cover 6, and a static seal is achieved between their end faces using a sealing structure (such as a sealing gasket, sealant, sealing ring, etc.). Simultaneously, the inner circumferential surface of the connecting hole 601 of the end cover 6 is also sealed to the outer circumferential surface of the drive shaft 2 using a sealing structure (such as an O-ring, sealing ring, etc.). This double-seal design prevents contaminants from entering from the end of the pulley 3 furthest from the body 101, further ensuring the cleanliness of the mating area between the sleeve 102 and the pulley 3.

[0042] When lubrication is required, grease or oil is injected through the oil injection hole 10 at the top of the body 101. The lubricating medium flows along the oil injection channel 12 in the bearing housing 1, first downward through the vertical channel 1201 in the body 101, then into the horizontal channel 1202 in the sleeve 102, and finally through the oil outlet hole 11 at the top of the outer circumference of the sleeve 102, into the annular gap 7 between the pulley 3 and the sleeve 102, and the annular gap 8 between the isolation sleeve 4 and the sleeve 102 that is connected to the annular gap 7.

[0043] The lubricating medium flows within the annular gap 7 and the annular gap 8, making full contact with the mating surfaces of the cylindrical roller bearing 9, the pulley 3, and the sleeve 102 to form a lubricating film, reducing friction and wear between components, and carrying away the heat generated during operation to maintain the normal operating temperature of the cylindrical roller bearing 9 and the transmission components.

[0044] As the device operates, the waste lubricating medium or impurities mixed in within the annular gap 8 will flow into the horizontally arranged oil outlet channel 14 inside the main body 101 through the L-shaped connecting oil channel 15 on the rotating seal ring 5, and finally be discharged from the outside of the device through the oil outlet hole 13 at the bottom of the inner wall of the main body 101. Regularly discharging the waste lubricating medium and replenishing it with new medium can continuously maintain a good lubrication environment and extend the service life of the device.

[0045] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A single-support belt drive device, comprising a bearing housing (1), the bearing housing (1) comprising a body (101), a drive shaft (2) rotatably disposed within the body (101), one end of the drive shaft (2) extending out of the body (101) and connected to a coupling (20), characterized in that, A cylindrical sleeve (102) extends from the side of the main body (101) away from the coupling (20). The sleeve (102) is coaxially arranged with the drive shaft (2). The other end of the drive shaft (2) passes through the sleeve (102). A pulley (3) is rotatably provided on the outer circumference of the sleeve (102). A cylindrical isolation sleeve (4) is provided at the end of the pulley (3) close to the main body (101). The pulley (3) and the isolation sleeve (4) are coaxially connected. The outer circumferential surface of the isolation sleeve (4) is in contact with the rotating shaft. The inner circumferential surface of the rotary seal (5) abuts against the body (101), and the rotary seal (5) is fixedly connected to the body (101); the end of the pulley (3) away from the body (101) is fixedly connected to the end cover (6), the end face of the pulley (3) is sealed to the end face of the end cover (6), the end cover (6) is fixedly connected to the drive shaft (2), and the end face of the end cover (6) is provided with a connecting hole (601), and the inner circumferential surface of the connecting hole (601) is sealed to the outer circumferential surface of the drive shaft (2).

2. The single-support belt drive device according to claim 1, characterized in that, The sleeve (102) is rotatably connected to the pulley (3) via a cylindrical roller bearing (9).

3. The single-support belt drive device according to claim 1, characterized in that, An annular gap one (7) is provided between the inner circumferential surface of the pulley (3) and the outer circumferential surface of the sleeve (102), and an annular gap two (8) is provided between the inner circumferential surface of the isolation sleeve (4) and the outer circumferential surface of the sleeve (102). The annular gap one (7) and the annular gap two (8) are connected. The top of the body (101) is provided with an oil injection hole (10), the top of the outer circumference of the sleeve (102) is provided with an oil outlet hole (11), and the bearing seat (1) is provided with an oil injection channel (12). The oil injection hole (10) and the oil outlet hole (11) are connected through the oil injection channel (12).

4. A single-support belt drive device according to claim 3, characterized in that, Oil outlet hole one (11) is connected to annular gap one (7) or annular gap two (8).

5. A single-support belt drive device according to claim 3, characterized in that, The oil filling channel (12) includes a vertical channel (1201) and a horizontal channel (1202). The vertical channel (1201) is located inside the body (101), and the horizontal channel (1202) is located inside the sleeve (102). The top end of the vertical channel (1201) is connected to the oil filling hole (10), and the bottom end of the vertical channel (1201) is connected to one end of the horizontal channel (1202). The horizontal channel (1202) is connected to the oil outlet hole (11).

6. A single-support belt drive device according to claim 3, characterized in that, The bottom of the inner wall of the body (101) is provided with an oil outlet hole 2 (13), and the body (101) is provided with a horizontally arranged oil outlet channel (14). One end of the oil outlet channel (14) is connected to the oil outlet hole 2 (13). A connecting oil passage (15) is provided between the inner circumferential surface of the rotating sealing ring (5) and the end face of the rotating sealing ring (5) near the end of the body (101). The other end of the oil outlet channel (14) is connected to the connecting oil passage (15), and the connecting oil passage (15) is connected to the annular gap 2 (8).

7. A single-support belt drive device according to claim 6, characterized in that, The connecting oil passage (15) is L-shaped.

8. A single-support belt drive device according to claim 1, characterized in that, The pulley (3) and the isolation sleeve (4) are fixedly connected by screw one (16), and the axis of screw one (16) is set parallel to the axis of the drive shaft (2).

9. A single-support belt drive device according to claim 1, characterized in that, The pulley (3) and the end cover (6) are fixedly connected by screw two (17), and the axis of screw two (17) is set parallel to the axis of the drive shaft (2).

10. A single-support belt drive device according to claim 1, characterized in that, The rotating sealing ring (5) is fixedly connected to the body (101) by screw three (18), and the axis of screw three (18) is set parallel to the axis of the transmission shaft (2).

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