Integrated shaft modular motor of injection molding machine

Abstract

The invention belongs to the technical field of injection molding machines, and particularly relates to an integrated shaft modular motor of an injection molding machine, the integrated shaft modular motor comprises a glue injection motor and a bearing assembly, the glue injection motor and the bearing assembly are coaxially arranged, the end faces of the glue injection motor and the bearing assembly are mutually connected, the glue injection motor comprises a shell, a stator, a rotor, a rotating shaft and a rear cover, the stator is arranged on the inner wall of the shell, and the rotor is arranged on the inner wall of the shell; the rotor is rotationally arranged in the stator, the inner wall of the rotor extends towards the center to form a partition plate, a through hole is formed in the center of the partition plate, the shell is covered with the rear cover, the rotating shaft is rotationally arranged in the bearing assembly and the glue injection motor, and a first shaft shoulder abuts against the end face of the bearing assembly; the rotating shaft penetrates through the through hole, the third shaft shoulder abuts against the side wall of the partition plate, the other end of the rotating shaft is sleeved with an expansion sleeve and abuts against the side wall of the other side of the partition plate, and the first shaft shoulder and the expansion sleeve are used for axial limiting of the two sides of the rotating shaft respectively. The integrated shaft can be quickly disassembled, the working efficiency is improved, and meanwhile the connecting stability can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding machines, and in particular relates to an integrated shaft modular motor of an injection molding machine. Background Art

[0002] The injection motor of the injection molding machine is a vital component of the injection molding machine. It is mainly responsible for driving the injection system of the injection molding machine, injecting the molten plastic into the mold through the nozzle for shape forming. In some designs, the output shaft of the injection motor may be directly connected to the injection screw, and the two are ensured to rotate synchronously through keyways, pins or other fasteners. This connection method is simple and direct, and is suitable for occasions with strict requirements on installation space. The drive shaft of some injection motors is connected to the injection screw through a coupling: a coupling is a commonly used connection device used to connect two shafts and transmit torque. The connection between the injection motor and the injection screw can be achieved through a coupling. The coupling can compensate for the misalignment between the two shafts, reduce vibration and impact, and thus improve the stability and reliability of the system.

[0003] The motor output shaft and the injection molding screw are connected by a connecting device, and the connecting device will produce mechanical friction, elastic deformation and vibration due to imbalance. The parts in the connecting device will produce friction when in contact, and this friction will consume part of the power, resulting in power loss. During the power transmission process, the connecting device may undergo elastic deformation due to the action of force, and this deformation will absorb part of the energy, resulting in power loss. If there are imbalance or vibration problems in the connecting device or related parts, these will increase additional power loss. The superposition of multiple factors will lead to increased power loss, and in the prior art, the injection molding screw is directly used as the output shaft of the motor through the design of an integrated shaft, which reduces power loss. However, the injection molding motor needs to be inspected internally during use. Since the output shaft is an integrated shaft, the disassembly of the motor requires the simultaneous disassembly of the entire injection molding screw that is an integrated structure with the output shaft, which causes inconvenience in the inspection process.

[0004] In order to facilitate disassembly, the rotor and the shaft are generally connected by a key. When used on large motors of injection molding machines, this will lead to stress concentration, and the shaft and rotor are prone to wear. At the same time, the matching clearance will also cause the injection molding machine to vibrate, affecting the injection molding accuracy. The rotor and shaft of some motors are connected by splines. If the shaft and the rotor are separated without removing the shaft from the injection molding machine, the friction between the shaft and the rotor is large, making it difficult to disassemble. Based on this, a modular motor with an integrated shaft for an injection molding machine is proposed. The integrated shaft can be quickly disassembled while being used, which improves work efficiency and improves the stability of the connection. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides an integrated shaft modular motor for an injection molding machine.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A modular motor with an integrated shaft for an injection molding machine, comprising an injection molding motor and a bearing assembly, wherein the injection molding motor and the bearing assembly are coaxially arranged and their end faces are connected to each other, the injection molding motor comprises a housing, a stator, a rotor, a rotating shaft and a back cover, wherein the stator is arranged on the inner wall of the housing, and the rotor is rotatably arranged in the stator, a partition extending toward the center of the inner wall of the rotor, a through hole is opened in the center of the partition, and the back cover is covered on the housing, the rotating shaft is rotatably arranged in the bearing assembly and the injection molding motor, and a first shaft shoulder abuts against the end face of the bearing assembly, the rotating shaft passes through the through hole and a third shaft shoulder abuts against the side wall of the partition, the other end of the rotating shaft is sleeved with an expansion sleeve and abuts against the other side wall of the partition, and the first shaft shoulder and the expansion sleeve are respectively used for axial limiting on both sides of the rotating shaft.

[0008] Furthermore, a gasket is provided between the third shaft shoulder and the partition.

[0009] Furthermore, the expansion sleeve includes an inner ring and an outer ring, the partition is located on a side wall of the expansion sleeve and has an annular vertical wall extending axially, the outer ring is arranged in the annular vertical wall, the inclined section of the inner ring is arranged between the outer wall of the rotating shaft and the inner wall of the outer ring, and the connecting section of the inner ring is connected to the side wall of the outer ring by bolts.

[0010] Furthermore, the diameter of the annular vertical wall decreases gradually from the side close to the partition to the side close to the expansion sleeve.

[0011] Furthermore, the diameter of the outer wall of the outer ring of the expansion sleeve decreases gradually from the side close to the partition to the side close to the expansion sleeve.

[0012] Furthermore, a second shoulder is provided on the rotating shaft between the injection motor and the bearing assembly, a front end bearing is abutted on the second shoulder, a fourth shoulder is provided on the rotating shaft between the partition and the rear cover, a rear end bearing is provided on the fourth shoulder.

[0013] Furthermore, the bearing assembly is a thrust angular contact ball bearing, and the thrust angular contact ball bearing in the bearing assembly is provided with five layers.

[0014] Furthermore, the five layers of thrust angular contact ball bearings are respectively the first bearing, the second bearing, the third bearing, the fourth bearing and the fifth bearing from the side close to the injection motor to the side far from the injection motor. The inner ring of the first bearing is close to the side of the injection motor, and the outer ring is far from the injection motor. The inner rings of the second bearing, the third bearing, the fourth bearing and the fifth bearing are far from the side of the injection motor, and the outer rings are close to the side of the injection motor. Thrust angular contact ball bearings in opposite directions are arranged to withstand axial loads during the working process and the disassembly and installation process.

[0015] The beneficial effects of the present invention are:

[0016] (1) By connecting the rotating shaft and the rotor through an expansion sleeve, the expansion sleeve can completely wrap around one section of the side wall of the entire rotating shaft, and the forces in all directions can be balanced when the expansion sleeve applies a clamping force to the rotating shaft; after the rotor and the rotating shaft are connected through the expansion sleeve, when the injection motor needs to be repaired separately, it is only necessary to open the rear cover and then loosen the bolts on the expansion sleeve to remove the injection motor without disassembling the entire rotating shaft at the same time, thereby improving work efficiency and connection stability;

[0017] (2) By reducing the diameter of the annular wall from inside to outside, the outer wall of the outer ring of the expansion sleeve gradually reduces its diameter from the side close to the partition to the side close to the expansion sleeve, so that the outer wall of the outer ring and the annular wall can be completely fitted when they are in contact, so that the expansion sleeve can be subjected to not only radial extrusion force but also axial extrusion force, and at the same time, a larger contact area can be provided when the two are in contact, thereby providing a greater clamping force and friction force;

[0018] (3) In the initial state, the maximum diameter of the outer ring of the expansion sleeve is smaller than the minimum diameter of the annular wall, so the expansion sleeve can be directly placed in the annular wall. After the bolts are tightened to increase the diameter of the outer ring, the outer ring diameter is larger than the minimum diameter of the annular wall, which can prevent the expansion sleeve from falling off from the annular wall due to the vibration of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the enlarged structure of the expansion sleeve of the present invention;

[0023] Figure 4 This is a schematic diagram of the internal tilt angle structure of the present invention;

[0024] Explanation of the reference numerals: 1. bearing assembly; 11. thrust angular contact ball bearing; 12. inner ring; 13. outer ring; 21. rotating shaft; 22. rotor; 23. expansion sleeve; 231. outer ring; 232. inner ring; 233. bolt; 24. stator; 25. front end bearing; 26. rear end bearing; 27. rear cover; 28. gasket. DETAILED DESCRIPTION

[0025] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0026] like Figure 1-4 As shown, an integrated shaft modular motor of an injection molding machine of the present invention comprises an injection molding motor and a bearing assembly 1, the injection molding motor and the bearing assembly 1 are coaxially arranged and the end faces are connected to each other, the injection molding motor comprises a housing, a stator 24, a rotor 22, a rotating shaft 21 and a rear cover 27, the stator 24 is arranged on the inner wall of the housing, the rotor 22 is rotatably arranged in the stator 24, a partition is extended toward the center of the inner wall of the rotor 22, the partition and the rotor 22 are an integral structure, a through hole is opened in the center of the partition, the rear cover 27 is covered on the housing, the rotating shaft 21 is rotatably arranged in the bearing assembly 1 and the injection molding motor, and the first shaft shoulder abuts against the end face of the bearing assembly 1, the rotating shaft 21 passes through the through hole and the third shaft shoulder abuts against the side wall of the partition, the other end of the rotating shaft 21 is sleeved with an expansion sleeve 23 and abuts against the other side wall of the partition, and the first shaft shoulder and the expansion sleeve 23 are respectively used for axial limiting on both sides of the rotating shaft 21;

[0027] In this embodiment, the rotating shaft 21 is an integrated structure. Compared with the prior art in which the shaft and the screw are connected by a coupling, and the screw is generally rotatably connected to the thread sleeve to make the thread sleeve reciprocate when the screw rotates, thereby making the injection molding head of the injection molding machine reciprocate. The rotating shaft 21 with an integrated structure integrates the shaft and the screw, and a thread is set at one end of the shaft to replace the screw.

[0028] At the same time, since it is necessary to realize convenient detachable connection between the rotating shaft 21 and the rotor 22 of the motor, and the connection of the rotating shaft 21 is generally through a key connection, when it is applied to a large motor of an injection molding machine, it will cause stress concentration, and the rotating shaft 21 and the rotor 22 are prone to wear. At the same time, the matching clearance will cause the injection molding machine to vibrate, affecting the injection molding accuracy; and the rotor 22 and the rotating shaft 21 of some motors are connected by splines. If the rotating shaft 21 and the rotor 22 are separated without removing the rotating shaft 21 from the injection molding machine, the friction between the rotating shaft 21 and the rotor 22 is large, and it is difficult to disassemble.

[0029] In order to avoid stress concentration and vibration between the rotating shaft 21 and the rotor 22, the rotating shaft 21 and the rotor 22 are connected by an expansion sleeve 23. Since the expansion sleeve 23 can completely surround and wrap a section of the side wall of the entire rotating shaft 21, and the forces in all directions can be balanced when the expansion sleeve 23 applies a clamping force to the rotating shaft 21. The key connection will cause the rotating shaft 21 to be unbalanced when rotating. In equipment such as injection molding machines that require high precision, the superposition of multiple errors will cause a greater impact on the precision.

[0030] Moreover, as a traditional mechanical connection method, key connection connects the shaft 21 and the partition of the rotor 22 through a key to transmit torque and axial force. However, key connection has some problems that may cause wear: the opening of the keyway will weaken the strength of the shaft and the hub, especially under high load and alternating load, such weakening may cause more serious wear; there is relative movement between the key and the keyway, such movement may cause wear and looseness, thereby affecting the stability and reliability of the connection.

[0031] The expansion sleeve 23 connection is a keyless connection method. By tightening the high-strength bolts 233, the inner ring 232 and the outer ring 231 of the expansion sleeve 23 respectively generate a huge clamping force with the shaft 21 and the rotor 22 partition, thereby achieving the connection. The expansion sleeve 23 connection has the following advantages in terms of wear: the expansion sleeve 23 connection does not require the opening of a keyway, so it will not weaken the strength of the shaft 21 and the rotor 22, reducing the possibility of wear; the expansion sleeve 23 connection will not produce relative movement during the working process, thus reducing the risk of wear and loosening; the expansion sleeve 23 connection has high centering accuracy, ensuring the stability and reliability of the connection, and reducing the wear caused by poor centering; the expansion sleeve 23 connection can withstand large loads, including heavy loads and alternating loads, so it is suitable for applications under high loads and harsh working conditions such as the injection motor of the injection molding machine.

[0032] After the rotor 22 and the rotating shaft 21 are connected by the expansion sleeve 23, when the injection motor needs to be repaired separately, it is only necessary to open the rear cover 27, and then loosen the bolts 233 on the expansion sleeve 23 to remove the injection motor without disassembling the entire rotating shaft 21 at the same time, thereby improving work efficiency and connection stability.

[0033] Specifically, the expansion sleeve 23 includes an inner ring 232 and an outer ring 231. The partition is located on a side wall of the expansion sleeve 23 and has an annular vertical wall extending axially. The outer ring 231 is arranged in the annular vertical wall. The inclined section of the inner ring 232 is arranged between the outer wall of the rotating shaft 21 and the inner wall of the outer ring 231. The connecting section of the inner ring 232 is connected to the side wall of the outer ring 231 by bolts 233. The inclined section of the inner ring 232 is a hollow truncated cone. The widest part of the inclined section is the connecting section. The connecting section is a hollow cylindrical shape. Bolts 233 are arranged on the radial surface of the connecting section to connect with the bolt 233 holes on the radial surface of the outer ring 231.

[0034] The working principle of the expansion sleeve 23 mainly relies on the clamping force generated when tightening the high-strength screw. When the bolt 233 is tightened, the outer ring 231 and the inner ring 232 of the expansion sleeve 23 are respectively subjected to pressure and radially deformed, thereby tightly fitting on the rotating shaft 21 and the annular wall. This tight fit generates sufficient friction, allowing the expansion sleeve 23 to transmit torque and achieve keyless connection.

[0035] At the same time, since the connecting section of the inner ring 232 of the expansion sleeve 23 is located outside the annular vertical wall, when the bolt 233 is tightened, the positions of the outer ring 231 of the expansion sleeve 23 and the rotating shaft 21 are relatively fixed, and the inner ring 232 of the expansion sleeve 23 gradually approaches the outer ring 231 as the relative distance between the inner ring 232 and the outer ring 231 increases. Finally, the side surface of the connecting section of the inner ring 232 gradually abuts against the side surface of the annular vertical wall and becomes more tightened as the bolt 233 is tightened, thereby reducing the fitting clearance and avoiding vibration.

[0036] Since the injection molding machine is a large-scale equipment, the size of the injection motor is also large, and the temperature inside the injection molding machine is also high. The materials of the shaft 21 of the injection motor and the partition of the rotor 22 may be different, and the deformation amounts generated at high temperature are different, which easily produces a matching gap, resulting in insufficient clamping force of the expansion sleeve 23 on the shaft 21. In order to avoid this problem, in one embodiment, the diameter of the annular wall is reduced from the side close to the partition to the side close to the expansion sleeve 23;

[0037] Since the diameter of the annular wall decreases from the inside to the outside, during installation, since only the outer ring 231 of the expansion sleeve 23 needs to be placed in the annular wall, and the inner ring 232 and the outer ring 231 are not yet connected, the outer ring 231 is relatively small in size and can be directly placed in the annular wall. After the inclined section of the inner ring 232 is placed between the inner wall of the outer ring 231 and the outer wall of the rotating shaft 21, the bolt 233 is screwed into the connecting section of the inner ring 232. At this time, the size of the outer ring 231 will gradually increase under the pressure of the inclined section of the inner ring 232 until the outer ring 231 is At the place where the size is larger than the minimum diameter of the annular wall, compared with the general expansion sleeve 23 which can only be subjected to radial extrusion force and static friction force, the expansion sleeve 23 in this solution can also be subjected to axial extrusion force because the diameter of the annular wall decreases from the inside to the outside. Through the forces in two different directions, the clamping force of the annular wall and the outer ring 231 on the rotating shaft 21 is greater than that in normal cases, and can provide greater friction force, so that sufficient clamping force can be provided under the condition of different deformation amounts of the rotating shaft 21 and the rotor 22 caused by temperature rise. After the bolts 233 are gradually tightened, the outer ring 231 of the expansion sleeve 23 will cause the outer diameter of the expansion sleeve 23 to be larger than the opening of the minimum diameter of the annular wall, which can prevent the expansion sleeve 23 from falling off the annular wall, and is more suitable for large injection molding machines and other equipment that are prone to vibration.

[0038] Furthermore, the diameter of the outer wall of the outer ring 231 of the expansion sleeve 23 decreases gradually from the side close to the partition to the side close to the expansion sleeve 23; when the diameter of the outer wall of the outer ring 231 of the expansion sleeve 23 of the annular wall is reduced gradually, it will cause the outer wall of the outer ring 231 and the inner wall of the annular wall to form an angle, and the outer wall of the outer ring 231 and the annular wall cannot be completely in contact with each other. In order to avoid this problem, the inclination of the outer wall of the outer ring 231 is made close to the inclination angle of the annular wall, so that the outer wall of the outer ring 231 and the annular wall can be completely fitted when abutting. Compared with the outer ring 231 of the general expansion sleeve 23, the two can provide a larger contact area when abutting, so as to provide a greater clamping force and friction force, and prevent slipping between the rotor 22 and the rotating shaft 21.

[0039] After the outer wall of the outer ring 231 and the inner wall of the annular wall form a certain angle and the inclination angles are close, in addition to providing a greater clamping force and preventing the expansion sleeve 23 from falling off in the annular wall, it can also prevent the shaft 21 from vibrating horizontally along the axis. In the initial state, the outer ring 231 of the expansion sleeve 23 is placed in the annular wall, and then the inclined section of the inner ring 232 is placed between the side wall of the shaft 21 and the inner wall of the outer ring 231, and then the bolt 233 is gradually tightened. At this time, the inner ring 232 of the expansion sleeve 23 gradually forms a clamping force on the shaft 21, so that the bolt 233 exerts an outward pulling force on the outer ring 231 of the expansion sleeve 23, and the inner wall of the annular wall exerts an inward squeezing force on the outer wall of the outer ring 231 of the expansion sleeve 23. The balance of the two forces can ensure that there is no relative movement between the expansion sleeve 23, the shaft 21 and the annular wall. However, the expansion sleeve 23 in the prior art is only subjected to radial extrusion force but not horizontal force, so it may produce small amplitude vibration under the vibration of the equipment during use, which may cause the expansion sleeve 23 to gradually fall off.

[0040] In order to avoid friction caused by long-term mutual contact and relative rotation between the partitions of the rotating shaft 21 and the rotor 22, which in turn causes wear, in order to reduce the impact of this problem, in one embodiment, a gasket 28 is provided between the third shaft shoulder and the partition; by providing a gasket at the shaft shoulder, the gap between the partitions of the rotor 22 can be easily adjusted to ensure the normal operation of the equipment. At the same time, the movement friction between the partitions of the rotor 22 and the shaft shoulder will cause wear, further affecting the normal operation of the rotating shaft 21. The gasket 28 can reduce the contact area between the two, thereby reducing friction and extending the service life.

[0041] Since the injection motor of large equipment such as injection molding machines is large in size, the size and weight of the rotating shaft 21 are also large, and the falling force generated at its end will cause the two sides of the lower half of the bearing assembly 1 to be subjected to uneven force, which is easy to cause wear. Therefore, in one embodiment, the rotating shaft 21 is provided with a second shaft shoulder between the injection motor and the bearing assembly 1, and the front end bearing 25 is abutted on the second shaft shoulder. A fourth shaft shoulder is provided on the rotating shaft 21 between the partition and the rear cover 27, and the rear end bearing 26 is provided on the fourth shaft shoulder. By respectively providing the front end bearing 25 and the rear end bearing 26 at the front and rear ends of the inner shell of the injection motor, the wear of the bearing assembly 1 can be reduced.

[0042] In order to avoid removing the rotating shaft 21 from the injection molding machine as a whole when the injection molding motor is removed for maintenance, the rotating shaft 21 is connected to the rotor 22 in the injection molding motor through the expansion sleeve 23. When the expansion sleeve 23 is connected, an axial force needs to be applied to the expansion sleeve 23, resulting in the rotating shaft 21 being subjected to an axial force. In machines such as injection molding machines that have high progress requirements, a large axial force can easily cause damage to the bearing. Therefore, in one embodiment, the bearing assembly 1 is a thrust angular contact ball bearing 11, and the thrust angular contact ball bearing 11 in the bearing assembly 1 is provided with five layers. The axial bearing capacity is improved by the multi-layer thrust angular contact ball bearing 11.

[0043] When used in pairs, thrust angular contact ball bearings 11 can significantly improve the bearing's load-bearing capacity. A single bearing may not be able to fully meet the needs of certain heavy-duty or high-load applications, but bearings used in pairs can disperse and balance the load, thereby extending the bearing's service life and improving the reliability of the equipment. Thrust angular contact ball bearings 11 used in pairs can provide higher rigidity. Rigidity is the ability of a bearing to resist deformation, which is critical for applications that require high precision and low vibration. By using bearings in pairs, the rigidity of the bearing can be further enhanced to ensure that the equipment maintains stability and precision during operation. The use of thrust angular contact ball bearings 11 in pairs can also improve rotational accuracy. Through precise installation and adjustment, it can be ensured that the bearing maintains a stable rotation trajectory during operation, thereby reducing vibration and noise and improving the operating efficiency and quality of the equipment.

[0044] Specifically, the five-layer thrust angular contact ball bearing 11 is sequentially the first bearing, the second bearing, the third bearing, the fourth bearing and the fifth bearing from the side close to the injection motor to the side far away from the injection motor. The inner ring 12 of the first bearing is close to the side of the injection motor, and the outer ring 13 is far away from the injection motor. The inner rings 12 of the second bearing, the third bearing, the fourth bearing and the fifth bearing are far away from the side of the injection motor, and the outer rings 13 are close to the side of the injection motor. The thrust angular contact ball bearings 11 in opposite directions are arranged to withstand axial loads during the working process and the disassembly and installation process.

[0045] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An integrated shaft modular motor for an injection molding machine, characterized in that: It includes an injection molding motor and a bearing assembly, which are coaxially arranged with their end faces connected to each other. The injection molding motor includes a housing, a stator, a rotor, a rotating shaft and a back cover. The stator is arranged on the inner wall of the housing, and the rotor is rotatably arranged in the stator. A partition is extended toward the center of the inner wall of the rotor, and a through hole is opened in the center of the partition. The back cover is covered on the housing. The rotating shaft is rotatably arranged in the bearing assembly and the injection molding motor, and a first shaft shoulder abuts against the end face of the bearing assembly. The rotating shaft passes through the through hole and a third shaft shoulder abuts against the side wall of the partition. The rotating shaft is sleeved with an expansion sleeve and the expansion sleeve abuts against the side wall of the partition away from the bearing assembly. The first shaft shoulder and the expansion sleeve are respectively used for axial limiting on both sides of the rotating shaft.

2. The one-shaft modular motor for an injection molding machine according to claim 1, characterized in that: The expansion sleeve includes an inner ring and an outer ring. The partition is located on a side wall of the expansion sleeve and has an annular vertical wall extending axially. The outer ring is arranged in the annular vertical wall. The inclined section of the inner ring is arranged between the outer wall of the rotating shaft and the inner wall of the outer ring. The connecting section of the inner ring is connected to the side wall of the outer ring by bolts.

3. The one-shaft modular motor for an injection molding machine according to claim 2, characterized in that: The diameter of the annular vertical wall decreases gradually from the side close to the partition plate to the side close to the expansion sleeve.

4. The one-shaft modular motor for an injection molding machine according to claim 3, characterized in that: The diameter of the outer wall of the outer ring of the expansion sleeve decreases gradually from the side close to the partition plate to the side close to the expansion sleeve.

5. The one-shaft modular motor for an injection molding machine according to claim 1, characterized in that: A gasket is arranged between the third shaft shoulder and the partition plate.

6. The one-shaft modular motor for an injection molding machine according to claim 1, characterized in that: The rotating shaft is provided with a second shoulder between the injection motor and the bearing assembly, and the front end bearing is abutted on the second shoulder. The rotating shaft between the partition and the rear cover is provided with a fourth shoulder, and the rear end bearing is provided on the fourth shoulder.

7. The one-shaft modular motor for an injection molding machine according to claim 1, characterized in that: The bearing assembly is a thrust angular contact ball bearing, and the thrust angular contact ball bearing in the bearing assembly is provided with five layers.

8. The one-shaft modular motor for an injection molding machine according to claim 7, characterized in that: The five layers of thrust angular contact ball bearings are respectively the first bearing, the second bearing, the third bearing, the fourth bearing and the fifth bearing from the side close to the injection motor to the side far away from the injection motor. The inner ring of the first bearing is close to the side of the injection motor, and the outer ring is far away from the injection motor. The inner rings of the second bearing, the third bearing, the fourth bearing and the fifth bearing are far away from the side of the injection motor, and the outer rings are close to the side of the injection motor. Thrust angular contact ball bearings in opposite directions are arranged to withstand axial loads during the working process and the disassembly and installation process.

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