A torque transmission device

Abstract

The present invention discloses a torque transmission device, comprising a transmission shaft, an inner sliding cylinder, a copper sleeve, an outer sliding cylinder, a magnetic disk, a power assembly, an adjustment mechanism, two bearing seats, a load and a base, wherein the power assembly, the outer cylinder, the bearing seat and the centrifugal fan are all connected to the base, the transmission shaft is fixed in axial position by two bearing seats and a retaining spring, the magnetic disk, the inner sliding cylinder, the copper sleeve, the outer sliding cylinder and the adjustment mechanism are connected to one end of the transmission shaft, and the other end of the transmission shaft is connected to the load, the power assembly and the magnetic disk have no rigid connection, the power assembly transmits power to the magnetic disk, and the adjustment mechanism can be adjusted to make the magnetic disk move axially on the transmission shaft and rotate together with the shaft to achieve torque transmission. Advantages: the present invention has a simple structure, is stable and reliable, has low power transmission loss, can fine-tune the adjustment mechanism to adjust the speed of one side of the magnetic disk, and achieve smooth stepless speed regulation.

Description

Technical Field

[0001] The present invention relates to the field of power transmission, and in particular to a torque transmission device. Background Art

[0002] The permanent magnet speed regulator is an energy-saving speed regulating device that transmits speed and torque between the power shaft and the output shaft through the interaction between the conductor rotor and the magnet rotor. The output speed and torque can be adjusted by adjusting the air gap between the conductor rotor and the magnet rotor. Compared with the traditional gearbox speed transmission, the permanent magnet speed regulator is more energy-saving and environmentally friendly, with obvious advantages such as simplicity and reliability, strong environmental adaptability, no electromagnetic interference, and a wide speed regulation range.

[0003] Most of the currently used disc-type permanent magnet speed regulators have complex structures and no stall protection measures. The axial movement of their power transmission mechanism is often completed through the contact friction between the wear-resistant ring and the load shaft. When the wear-resistant ring is worn out for a long time, a gap will be generated between it and the shaft, making the movement of the bearing installed therein unstable, greatly shortening the bearing life. In addition, the bearing and wear-resistant ring are inconvenient to replace, which brings inconvenience to maintenance work. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the bearings in the power transmission mechanism of an ordinary disc-type permanent magnet speed regulator wear out too quickly and there is no stall protection measure. A torque transmission device is proposed. The adjustment mechanism uses the characteristics of the matching between balls and ball grooves to move on the shaft to adjust the air gap and transmit power, and ensures that the magnet rotor has a certain movable spacing so that the magnet rotor automatically moves away from the conductor rotor when stalled, preventing overheating and demagnetization. The present invention has a simple structure, easy installation and high reliability.

[0005] The technical solution of the present invention is achieved in the following manner: a torque transmission device includes a transmission shaft, an inner sliding cylinder, a copper sleeve, an outer sliding cylinder, a magnetic disk, a power assembly, an adjustment mechanism, and a load. One end of the transmission shaft is connected to the load, and the other end is connected to the magnetic disk through the inner sliding cylinder, the copper sleeve, and the outer sliding cylinder. A movable air gap is provided between the power assembly and the magnetic disk. The adjustment mechanism is located on the transmission shaft and between the load and the magnetic disk. The adjustment mechanism is connected to the inner sliding cylinder and adjusts the axial position of the magnetic disk on the transmission shaft. The transmission shaft is provided with an axially limited limit member at one end near the magnetic disk, and two first ball grooves in the same plane are provided on the surface of this end. The transmission shaft is provided with two first retaining spring grooves for assembling corresponding retaining springs at one end near the load. Used to limit the axial movement of the shaft; the magnetic disk is indirectly connected to the transmission shaft, and the magnetic disk can move axially; the inner sliding cylinder is a sleeve with a flange, and its flange end is provided with a countersunk hole, and the flange end does not contact the magnetic disk, and the end away from the flange end is provided with two second retaining ring grooves for accommodating external retaining springs, its outer surface is a smooth surface, and its inner wall is provided with two rows of ball channels, and the inner cylinder balls move freely in the channels. The inner cylinder balls are installed from the end without flange and sealed by the inner cylinder dustproof sealing ring, and the two rows of inner cylinder balls are opposite to the first ball grooves The inner cylinder balls are arranged on the inner wall of the sleeve and protrude a part of the inner wall. The inner sliding cylinder is installed on the transmission shaft along the first ball groove, and can move axially along the transmission shaft and rotate with the transmission shaft; the copper sleeve is a flanged copper sleeve, and the flange end does not contact the magnetic disk. The inner wall surface of the copper sleeve is a smooth surface, and the outer surface is provided with two second ball grooves located in the same plane. The copper sleeve is sleeved on the outer surface of the inner sliding cylinder, and the two are relatively fixed; the outer sliding cylinder is a flanged sleeve, which is relatively fixed to the magnetic disk, and the inner wall of the outer sliding cylinder is provided with two rows of ball grooves. Ball channel, the outer cylinder ball rolls freely in the channel, the outer cylinder ball is installed from the end without flange and is sealed by the outer cylinder dustproof sealing ring, the outer cylinder balls are evenly arranged on the inner wall of the sleeve and protrude a part of the inner wall, the position corresponds to the two second ball grooves on the copper sleeve, the outer sliding cylinder is installed on the copper sleeve along the second ball groove, and can move axially along the copper sleeve and rotate with the copper sleeve. The axial movement of the outer sliding cylinder is to automatically remove the magnetic disk carried by the outer sliding cylinder when the load is blocked, thereby preventing the device from overheating and demagnetizing the magnet.

[0006] The technical solution further defined in the present invention is:

[0007] The power assembly consists of a copper ring, a steel disc, an expansion sleeve, and a motor. The copper ring is connected to the steel disc, with the copper ring surface facing the magnetic disc and a 5-15mm air gap. This design is based on the load and motor's operating speed range. The steel disc is fixed to the motor shaft via an expansion sleeve. Compared to key connections, this design offers advantages such as a compact structure, easy and reliable installation, the ability to transmit high torque, and the ability to limit axial displacement of the steel disc.

[0008] The adjustment mechanism consists of two bearings, an inner tube, a bearing end cap, a handle, an outer tube, and a wear-resistant packing ring. The inner tube is cylindrical, with bearing seat holes at both ends and a hollow center. The two bearing outer rings are mounted in the bearing seat holes at both ends of the inner tube. The two bearing inner rings are mounted on the outer surface of the inner sliding tube, aligned with the retaining ring groove, and the copper sleeve contacts one of the bearing inner rings at the end away from the flange. The bearing end caps are connected to the inner tube by bolts. The inner tube has a threaded hole on the outer surface away from the inner sliding tube. The handle is cylindrical, with a threaded section at one end that mates with the threaded hole on the outer surface of the inner tube. The outer tube is cylindrical with a flange. The inner tube is located inside the outer tube, with a gap between the inner tube and the outer tube wall. The two tubes move in contact via the wear-resistant packing ring. The outer tube has a curved slot through which the handle passes and can move, driving the inner tube to axially expand and contract relative to the outer tube. The design aims to convert the curved motion into linear motion of the inner tube, ultimately driving the axial movement of the magnet disk and changing the size of the air gap.

[0009] The load is set as a centrifugal fan, and the motor, two bearing seats and the load are fixed to the base by bolts, and the motor shaft and the transmission shaft are on the same axis.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] The technical solution of the present invention, through the linear cooperation between the ball and the ball groove, enables the magnetic disk to both move axially and transmit torque. The overall friction resistance of the device is small, the power loss is low, and it is convenient and easy to use, which can greatly improve the life of the bearing. In addition, the outer sliding cylinder drives the movement of the magnetic disk on the copper sleeve to avoid the situation where the air gap remains unchanged during load stall, resulting in temperature increase and magnet demagnetization.

[0012] Compared with wear-resistant rings made of polytetrafluoroethylene, this technical solution not only has less wear and longer service life, but polytetrafluoroethylene wear-resistant rings will wear severely after long-term use, resulting in gaps, which increase vibration and eventually damage the bearings, shortening the service life of the bearings, thereby reducing the service life of the entire equipment, increasing the occurrence of failures, and increasing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the torque transmission device of the present invention.

[0014] Figure 2 This is a partial enlarged view of the structural position of the inner and outer sliding cylinders of the present invention.

[0015] Figure 3 It is a schematic diagram of the structure of the power component of the present invention.

[0016] Figure 4 This is a schematic diagram of the magnetic disk structure of the present invention (disassembled).

[0017] Figure 5 It is a schematic diagram of the structure of the adjustment mechanism of the present invention.

[0018] Figure 6 It is a schematic diagram of the overall appearance structure of the present invention. DETAILED DESCRIPTION

[0019] The following is a combination of the embodiments of the present invention Figure 1-6 , the technical solutions in the embodiments of the present invention are described in detail.

[0020] Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Example 1

[0024] This embodiment provides a torque transmission device, such as Figure 1 and Figure 5 As shown, it includes a transmission shaft 1, an inner sliding cylinder 2, a copper sleeve 3, an outer sliding cylinder 4, a magnet disk 5, a power component 6, an adjustment mechanism 7, a load 8, a bearing seat 9 and a base 10.

[0025] One end of the transmission shaft 1 connected to the magnetic disk 5 has a thread, and the limiter 1a is set as a locking nut, which cooperates with the thread at the end of the shaft. Its purpose is to limit the displacement of the magnetic disk 5 toward the power component 6 to prevent it from moving and falling off. The other end of the transmission shaft 1 is connected to the load 8, that is, connected to the fan blades of the centrifugal fan. The largest diameter section of the transmission shaft 1 is located between the bearing end faces of the two bearing seats 9, and is installed by a retaining spring to the position of the fixed shaft corresponding to the first retaining spring groove 1c, while limiting the axial movement of the shaft. The transmission shaft 1 is divided into three sections as a whole, and the diameters are from large to small: a section between the two bearing seats 9, a section for assembling the sliding cylinder and the adjustment mechanism 7, and a section connected to the load 8.

[0026] The inner sliding cylinder 2 is a long cylinder with a flange at one end. The flange end is provided with evenly distributed countersunk bolt holes, and the flange end does not contact the magnetic disk 5. Two second retaining ring grooves 2b are opened at the end away from the flange to accommodate external retaining springs, which are used for axial positioning of the bearing 7a. The outer surface of the inner sliding cylinder 2 is a smooth surface, and two rows of ball channels are provided in its inner wall. The inner cylinder balls 2a can roll freely in the channels. The inner cylinder balls 2a are installed from the end without flange and the inner cylinder dustproof sealing ring 2c is sealed to this end by screws. The two rows of inner cylinder balls 2a correspond to the positions of the first ball grooves 1b. The inner cylinder balls 2a are evenly arranged on the inner wall of the sleeve and protrude a part of the inner wall. The inner sliding cylinder 2 is sleeved on the transmission shaft 1 along the first ball groove 1b, and can both move axially along the transmission shaft 1 and transmit torque to rotate with the transmission shaft 1.

[0027] The copper sleeve 3 is a flanged graphite copper sleeve. Its flange end is equipped with evenly spaced threaded holes that correspond to the countersunk holes on the flange end of the inner sliding cylinder 2. This flange end does not contact the magnetic disk 5. This design is designed for ease of assembly and disassembly, as the graphite component provides excellent lubrication. The inner surface of the copper sleeve 3 is smooth, and its outer surface is defined by two coplanar second ball grooves 3a. The copper sleeve 3 fits over the outer surface of the inner sliding cylinder 2, and the two are connected by bolts at the flange. The copper sleeve serves as an indirect connection between the outer sliding cylinder 4 and the inner sliding cylinder 2.

[0028] like Figure 1 and Figure 2As shown, the outer sliding cylinder 4 is a sleeve with a flange, and the flange end is provided with a countersunk bolt hole, which is fixed to the magnet disk 5 by bolts. The inner wall of the outer sliding cylinder 4 is provided with two rows of ball channels, and the outer cylinder balls 4a can roll freely in the channels. The outer cylinder balls 4a are installed from the end without flange and the outer cylinder dustproof sealing ring 4b is sealed to this end by screws. The outer cylinder balls 4a are evenly arranged on the inner wall of the sleeve and protrude a part of the inner wall. The position corresponds to the two second ball grooves 3a. The outer sliding cylinder 4 is sleeved on the copper sleeve 3 along the second ball groove 3a, and can be rolled along the copper sleeve. The sleeve 3 performs axial movement and rotational movement with the copper sleeve 3. The outer sliding cylinder 4 drives the magnetic disk 5 to perform axial displacement. One end limit is completed by the limit member 1a, and the other end limit is completed by the bearing end cover 7c close to the outer sliding cylinder 4. The purpose of this displacement design is to take into account that when the load 8 is stalled, the copper ring 6a and the magnetic disk 5 will produce a speed difference, which will increase the equipment temperature for a long time and demagnetize the permanent magnet rotor b. This displacement can make the magnetic disk 5 automatically displace the conductor rotor when the load 8 is stalled, thereby increasing the air gap and reducing the heat generated by their interaction.

[0029] like Figure 4 As shown, the magnet disk 5 is composed of a disk body 5a, a permanent magnet 5b and a cover plate 5c. The center of the disk body 5a is a through hole, and a uniformly distributed threaded hole is provided around the center, corresponding to the position of the flange end countersunk hole of the outer sliding cylinder 4. The permanent magnet 5b is placed in the uniformly distributed groove of the disk body 5a. The cover plate 5c compresses the permanent magnet and is connected to the disk body 5a by bolts. This structural design is taken into account the overall aesthetics and the convenience of installation. The permanent magnet 5b material in the magnet disk 5 is a neodymium iron boron permanent magnet. Compared with other permanent magnets, its magnetic attraction is strong and its magnetic conductivity is strong, which is suitable as a permanent magnet material in a magnetic rotor. Neodymium iron boron permanent magnet is a known product on the market and can be directly purchased. Further, there are many manufacturers selling neodymium iron boron permanent magnets at present, and this technical solution does not limit specific manufacturers.

[0030] like Figure 3 As shown, the power assembly 6 includes a copper ring 6a, a steel disk 6b, an expansion coupling sleeve 6c and a motor 6d. The motor 6d is fixed to the base 10 by bolts, the copper ring 6a and the steel disk 6b are connected by bolts, and the copper ring 6a surface is opposite to the cover plate 5c of the magnet disk 5 and is provided with a movable air gap of 5-15mm. The steel disk 6b and the motor shaft are connected and fixed by the expansion coupling sleeve 6c. The expansion coupling sleeve transmits large torque, occupies little space, and can also limit the axial displacement of the steel disk 6b. Compared with the key connection, it is more convenient and simple.

[0031] like Figure 5 and Figure 6As shown, the adjustment mechanism 7 includes two bearings 7a, an inner tube 7b, a bearing end cover 7c, a handle 7d, an outer tube 7e, and a wear-resistant packing ring 7f. The inner tube is cylindrical with bearing seat holes at both ends and is hollow in the middle. The outer rings of the two bearings 7a are installed in the bearing seat holes at both ends of the inner tube 7b. The inner rings of the two bearings 7a are installed on the outer surface of the inner sliding tube 2, and their positions are aligned with the second retaining ring groove 2b. Taking into account the high speed and the small amount of radial and axial loads here, the bearing 7a adopts a deep groove ball bearing, and the end of the copper sleeve 3 away from the flange is in contact with the inner ring of the bearing. The retaining spring and the copper sleeve 3 limit the axial displacement of the bearing, and also connect the adjustment mechanism 7 to the inner sliding tube 2. The bearing end cover 7c is connected to the two ends of the inner tube 7b by bolts. The outer surface of the inner tube 7b away from the inner sliding tube 2 is provided with a retaining ring. A threaded hole, the handle 7d is cylindrical, one end of which is provided with a thread, which is matched with the threaded hole on the outer surface of the inner tube 7b. The outer tube 7e is cylindrical with a flange, and one end of the flange is connected to the base 10 by a bolt. The inner tube 7b is located inside the barrel of the outer tube 7e and has a gap with the inner wall of the outer tube 7. The two are in contact and move through the wear-resistant packing ring 7f. The design of the wear-resistant packing ring is to make the structure more compact and increase the moving friction of the inner tube 7b to prevent it from moving accidentally. A curved through groove is opened on the outer tube 7e, and the handle 7d passes through the through groove and can move in the groove. The curved movement of the handle 7d in the groove drives the inner tube to move, and the inner tube 7e then drives the inner sliding tube 2 to move through the bearing 7a, and finally drives the movement of the magnetic disk 5, thereby changing the air gap and adjusting the speed and torque of the transmission shaft 1.

[0032] like Figure 6 As shown, the two bearing seats 9 and the load 8 are fixed to the base 10 by bolts. The bearing seat 9 is a standard UCPH type vertical bearing seat, and the load 8 is a centrifugal fan. The bearing seat 9 and the centrifugal fan are both known products in the technical field and can be purchased directly. Furthermore, there are many manufacturers currently selling centrifugal fans and standard UCPH bearing seats, and the present technical solution is not limited to specific manufacturers.

[0033] The motor shaft and the transmission shaft 1 are located on the same axis to ensure that the bearing seat 9, the copper ring 6a, the magnetic disk 5 and the load 8 are as concentric as possible to reduce the impact of the different axis errors on the stability of the equipment operation.

[0034] The usage process of this embodiment is:

[0035] Before use, assemble the equipment. First, place the base 10 on a flat surface, install the packing ring 7f into the groove of the outer cylinder 7e, and fix the outer cylinder 7e to the bracket of the base 10 with bolts, and make the curved groove part exposed upward. Then, pass the transmission shaft 1 from the left (the side of the motor base boss) to the right through the outer cylinder 7e and the boss of the fixed outer cylinder 7e. When passing through the first bearing seat 9, use the circlip to cover the two shafts at the maximum diameter of the shaft, and continue to pass through the second bearing seat 9. Adjust the position of the bearing seat so that the bearing end faces of the bearing seat are aligned with the first and second bearing seats respectively. A circlip groove 1c is aligned, at this time, the two shafts are pushed into the circlip grooves respectively with circlips, and then the two bearing seats 9 are fixed to the corresponding positions of the base 10 with bolts, and the torque transmission device and the adjustment mechanism 7 are assembled later. First, the balls of the inner and outer sliding cylinders are assembled, and then the copper sleeve 3 is installed on the outer surface of the inner sliding cylinder 2 and fixed with bolts, and then the outer sliding cylinder 4 is installed on the surface of the copper sleeve 3 along the second ball groove 3a, and connected to the magnet disk 5 with bolts, and then a bearing end cover 7c is put on the sliding cylinder 2, and then a bearing 7a is installed inside. On the sliding cylinder 2, one end of which is in contact with the copper sleeve 3. At this moment, a shaft is installed to fix the bearing 7a with a retaining ring, and then the inner cylinder 7b is installed so that one end of the surface threaded hole is on the right. After the first bearing 7c is completely pressed into the inner cylinder 7b, the second bearing 7c is installed and the same shaft retaining ring is installed. After that, the second bearing end cover 7c is installed and the two bearing end covers 7c are fixed to the inner cylinder 7b with bolts. Then, the assembled torque transmission device and adjustment mechanism 7 are installed along one end of the first ball groove 1b of the transmission shaft 1, and the outer ring of the inner cylinder 7b passes through Wear-resistant packing ring 7f, and the threaded hole on the surface of the inner tube 7b is visible through the curved groove of the outer tube 7e. At this time, the handle 7d is passed through the curved groove and connected to the inner tube 7b by thread. After installation, the limiter locking nut is installed on the thread of the transmission shaft 1. Next, assemble the power assembly 6. First, connect the copper ring 6a and the steel plate 6b with bolts, and then use the expansion coupling sleeve 6c to connect the steel plate 6b and the motor shaft. Finally, install the motor 6d and the load 8 on the base 10 with bolts, turn on the power, and adjust the handle 7d to control the air gap for speed regulation.

[0036] The above embodiments are only for illustrating the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention.

Claims

1. A torque transmission device, characterized in that: The invention comprises a transmission shaft (1), an inner sliding cylinder (2), a copper sleeve (3), an outer sliding cylinder (4), a magnetic disk (5), a power assembly (6), an adjustment mechanism (7) and a load (8), wherein one end of the transmission shaft (1) is connected to the load (8), and the other end is connected to the magnetic disk (5) through the inner sliding cylinder (2), the copper sleeve (3) and the outer sliding cylinder (4), an active air gap is provided between the power assembly (6) and the magnetic disk (5), the adjustment mechanism (7) is located on the transmission shaft (1) and is located between the load (8) and the magnetic disk (5), the adjustment mechanism (7) is connected to the inner sliding cylinder (2), and adjusts the axial position of the magnetic disk (5) on the transmission shaft (1), and the transmission The shaft (1) is provided with an axially limiting stopper (1a) at one end close to the magnetic disk (5), and two first ball grooves (1b) in the same plane are provided on the surface of this end. The transmission shaft (1) is provided with two first retaining ring grooves (1c) equipped with corresponding retaining rings at one end close to the load (8) to limit the axial movement of the shaft; the magnetic disk (5) is indirectly connected to the transmission shaft (1), and the magnetic disk (5) can move axially; the inner sliding cylinder (2) is a sleeve with a flange, and a countersunk hole is provided at the flange end thereof, and the flange end does not contact the magnetic disk (5); the end away from the flange end is provided with two second retaining ring grooves (2b) for accommodating external retaining rings, and its outer surface is The inner wall of the inner cylinder has two rows of ball channels, and the inner cylinder balls (2a) roll freely in the channels. The inner cylinder balls (2a) are installed from the end without flange and sealed by the inner cylinder dustproof sealing ring (2c). The two rows of inner cylinder balls (2a) correspond to the positions of the first ball groove (1b). The inner cylinder balls (2a) are evenly arranged on the inner wall of the inner sliding cylinder (2) and protrude a part of the inner wall. The inner sliding cylinder (2) is sleeved on the transmission shaft (1) along the first ball groove (1b); the copper sleeve (3) is a flanged copper sleeve, and the flange end does not contact the magnetic disk (5). The inner wall surface of the copper sleeve (3) is a smooth surface, and the outer surface has two holes located in the same plane. The outer sliding cylinder (2) is provided with a second ball groove (3a), and the copper sleeve (3) is sleeved on the outer surface of the inner sliding cylinder (2), and the two are relatively fixed; the outer sliding cylinder (4) is a sleeve with a flange, which is relatively fixed to the magnetic disk (5), and the inner wall of the outer sliding cylinder (4) is provided with two rows of ball channels, and the outer cylinder balls (4a) roll freely in the channels. The outer cylinder balls (4a) are installed from the end without flange and sealed by the outer cylinder dustproof sealing ring (4b). The outer cylinder balls (4a) are evenly arranged on the inner wall of the outer sliding cylinder (4) and protrude a part of the inner wall, and the position corresponds to the position of the two second ball grooves (3a). The outer sliding cylinder (4) is sleeved on the copper sleeve (3) along the second ball groove (3a).

2. A torque transmission device according to claim 1, characterized in that: The power assembly (6) comprises a copper ring (6a), a steel disk (6b), an expansion coupling sleeve (6c) and a motor (6d). The copper ring (6a) is connected to the steel disk (6b). The surface of the copper ring (6a) is opposite to the magnetic disk (5) and is provided with a movable air gap of 5-15 mm. The steel disk (6b) is connected and fixed to the motor shaft via the expansion coupling sleeve (6c).

3. A torque transmission device according to claim 1 or 2, characterized in that: The torque transmission device further comprises two bearing seats (9) and a base (10), the motor (6d), the two bearing seats (9) and the load (8) are all fixed on the base (10), and the motor shaft and the transmission shaft (1) are on the same axis.

4. The torque transmission device according to claim 1, characterized in that: The adjusting mechanism (7) comprises two bearings (7a), an inner cylinder (7b), a bearing end cover (7c), a handle (7d), an outer cylinder (7e), and a wear-resistant packing ring (7f). The inner cylinder (7b) is cylindrical, has bearing seat holes at both ends, and is hollow in the middle. The outer rings of the two bearings (7a) are installed in the bearing seat holes at both ends of the inner cylinder (7b). The inner rings of the two bearings (7a) are installed on the outer surface of the inner sliding cylinder (2) and are aligned with the second retaining ring groove (2b). The end of the copper sleeve (3) away from the flange contacts the inner ring of one bearing (7a). The bearing end cover (7c) is connected to the inner cylinder (7b) by bolts. The two ends are connected, and the inner tube (7b) is provided with a threaded hole on the outer surface of the end away from the inner sliding tube (2); the handle (7d) is cylindrical, and one end of the handle is provided with a thread, which is matched with the threaded hole on the outer surface of the inner tube (7b); the outer tube (7e) is cylindrical with a flange, and the inner tube (7b) is located inside the outer tube (7e) and has a gap with the inner wall of the outer tube (7e). The two move in contact with each other through a wear-resistant packing ring (7f). The outer tube (7e) is provided with a curved groove, and the handle (7d) passes through the groove and can move in the groove, driving the inner tube (7b) to axially expand and contract relative to the outer tube (7e).

5. The torque transmission device according to claim 1, characterized in that: The load (8) is a centrifugal fan.

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