Hollow rotating shaft for motor

Abstract

The utility model relates to the technical field of motor rotating shafts, in particular to a hollow rotating shaft for a motor. Comprising a shaft body; a hollow groove is formed in the shaft body; a key groove is formed in the surface of the shaft body; by arranging the sleeve, the positioning rod is inserted into the mounting hole in the surface of the sleeve and the through hole in the surface of the shaft body, so that the sleeve and the shaft body are fixedly connected in a riveted mode, the sleeve fixedly connected to the shaft body can increase the length of the shaft body, the sleeve is directly connected to the shaft body, and it can be guaranteed that the centering precision of the sleeve and the shaft body is higher; compared with a coupler, the sleeve is additionally arranged, so that the structural rigidity of the rotating shaft is improved, the bending deformation of the shaft is reduced, and the straightness of the shaft body of the rotating shaft is improved; and the operators do not need to prepare motors with different specifications for standby application, so that repeated alignment and debugging of the replaced motors are avoided, the operation complexity is further reduced, and the practicability of the device is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor shafts, in particular to a hollow shaft used for a motor. Background Art

[0002] The motor shaft refers to the rotating shaft in the motor used to connect the load and output power. It is usually composed of the motor's rotor and bearings. The motor shaft is generally used to transmit torque and is mostly solid. In order to meet some special needs, some shafts are designed to be hollow. Hollow shafts can be used to arrange cables, pipes or other components inside, saving external space and simplifying system design. For example, the hub motor shaft needs to lead out cables to connect to the power supply. In addition, the shaft adopts a hollow design, so that the inertia of the hollow shaft is smaller than that of the solid shaft, so that the motor can respond faster when starting and stopping.

[0003] However, the shaft length of existing motors is often fixed. However, in some equipment or systems, due to the influence of installation space and installation layout, it is difficult for a fixed-length shaft to be accurately connected with other mechanical parts. For example, in a narrow or complex installation space, the position of the motor cannot be adjusted, resulting in the shaft being unable to be correctly connected with other parts. In this case, an additional coupling is required. However, the straightness of the shaft body cannot be controlled by connecting the external output shaft through the coupling, which will affect the normal transmission efficiency of the motor. In this regard, if a motor with a shaft of different length is selected, the operator needs to prepare motors of different specifications as spares, and then repeatedly align and debug the replaced motor, which increases the complexity of the operation and becomes very troublesome.

[0004] In view of this, in order to overcome the above technical problems, the utility model proposes a hollow shaft for a motor, which solves the above technical problems. Utility Model Content

[0005] In order to make up for the deficiencies of the prior art, the utility model proposes a hollow rotating shaft for a motor. The utility model arranges a sleeve so that a positioning rod is inserted into the mounting hole on the surface of the sleeve and the through hole on the surface of the shaft body, thereby fixing the sleeve and the shaft body in a riveted form, so that the sleeve fixed on the shaft body can increase the length of the shaft body, and the sleeve is directly connected to the shaft body, which can ensure that the centering accuracy of the sleeve and the shaft body is higher. Compared with the coupling, the addition of the sleeve helps to improve the structural rigidity of the rotating shaft, thereby reducing the bending deformation of the shaft and improving the straightness of the rotating shaft body; and there is no need for operators to prepare motors of different specifications as spares, which avoids repeated alignment and debugging of the replaced motors, thereby reducing the complexity of operation, and further improving the practicality of the utility model.

[0006] The technical solution adopted by the utility model to solve its technical problems is: the utility model describes a hollow rotating shaft for a motor, comprising a shaft body; a hollow groove is provided inside the shaft body; a key groove is provided on the surface of the shaft body; a through hole connected to the hollow groove is provided on the surface of the shaft body; the through hole is located at the end of the shaft body away from the key groove; a sleeve is sleeved on the surface of the shaft body; a bottom groove opposite to the hollow groove is provided at the bottom of the sleeve; the sleeve is made of carbon steel material; a mounting hole matching the through hole is provided on the surface of the sleeve; two groups of mounting holes are provided; four mounting holes are provided in each group; a positioning rod is slidably connected in the mounting hole; a card groove is provided on the surface of the positioning rod; a groove is provided on the inner wall of the through hole; a card block is slidably connected in the groove.

[0007] Preferably, an annular groove is provided on one side of the shaft body; a push ring is connected to the annular groove in a sliding seal; the push ring is fixedly connected to the groove wall of the annular groove by a connecting spring; and the annular groove and the groove are connected by an oil channel.

[0008] Preferably, a push plate is provided inside the sleeve; the push plate is fixedly connected to a side of the sleeve close to the bottom groove by installing a spring.

[0009] Preferably, a steel wire rope is fixedly connected to a side of the push plate close to the mounting spring; an end of the steel wire rope away from the push plate passes through a sleeve; and the push plate is made of PTFE material.

[0010] Preferably, a storage groove is provided at one end of the sleeve close to the mounting spring.

[0011] Preferably, a support tube is arranged inside the sleeve; a threaded groove is opened at one end of the sleeve close to the bottom groove; a flange is fixedly connected to the outer wall of the support tube; the flange is threadedly connected in the threaded groove; the outer wall of the support tube is in sliding sealing contact with the inner wall of the hollow groove.

[0012] The beneficial effects of the utility model are as follows:

[0013] The utility model provides a sleeve so that the positioning rod is inserted into the mounting hole on the surface of the sleeve and the through hole on the surface of the shaft body, thereby fixing the sleeve and the shaft body in the form of rivets, so that the sleeve fixed on the shaft body can increase the length of the shaft body, and the sleeve is directly connected to the shaft body, which can ensure that the centering accuracy of the sleeve and the shaft body is higher. Compared with the coupling, the addition of the sleeve helps to improve the structural rigidity of the rotating shaft, thereby reducing the bending deformation of the shaft and improving the straightness of the rotating shaft body; and there is no need for the operator to prepare motors of different specifications as spares, which avoids repeated alignment and debugging of the replaced motor, thereby reducing the complexity of operation, and further improving the practicality of the utility model.

[0014] The utility model arranges the support tube so that the support tube and the sleeve are fixedly connected; thereby, the support tube and the sleeve are combined to form a composite structure, so that the rigidity of the composite structure is greatly improved; the support tube and the sleeve can better share and transfer the load, thereby improving the bending and torsion resistance of the sleeve; and after the support tube and the sleeve are threadedly connected, the formed composite structure can provide better centering accuracy; due to the fixed relationship between the support tube and the sleeve, the centering error of the shaft body will be minimized, further reducing the straightness problem; the shaft body is also more stable under the action of load and is not prone to bending; the practicality of the utility model is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0016] Figure 1 It is a three-dimensional diagram of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the utility model;

[0018] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0019] Figure 4 yes Figure 2 The enlarged view of point B in the middle;

[0020] Figure 5 It is a three-dimensional diagram of the shaft body used in the utility model;

[0021] Figure 6 is a three-dimensional diagram of the sleeve used in the utility model;

[0022] In the figure: 1, shaft body; 11, hollow groove; 12, keyway; 13, through hole; 14, positioning rod; 141, card slot; 15, groove; 151, card block; 16, annular groove; 161, push ring; 162, connecting spring; 17, oil channel; 2, sleeve; 21, bottom groove; 22, mounting hole; 23, push plate; 231, mounting spring; 24, wire rope; 25, storage groove; 26, support tube; 27, threaded groove; 28, flange. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0024] like Figures 1 to 6As shown, the utility model describes a hollow rotating shaft for a motor, comprising a shaft body 1; a hollow groove 11 is provided inside the shaft body 1; a key groove 12 is provided on the surface of the shaft body 1; a through hole 13 connected to the hollow groove 11 is provided on the surface of the shaft body 1; the through hole 13 is located at the end of the shaft body 1 away from the key groove 12; a sleeve 2 is sleeved on the surface of the shaft body 1; a bottom groove 21 opposite to the hollow groove 11 is provided at the bottom of the sleeve 2; the sleeve 2 is made of carbon steel material; a mounting hole 22 matching the through hole 13 is provided on the surface of the sleeve 2; two groups of mounting holes 22 are provided; four mounting holes 22 are provided in each group; a positioning rod 14 is slidably connected in the mounting hole 22; a card groove 141 is provided on the surface of the positioning rod 14; a groove 15 is provided on the inner wall of the through hole 13; a card block 151 is slidably connected in the groove 15.

[0025] As an embodiment of the utility model, an annular groove 16 is opened on one side of the shaft body 1; a push ring 161 is connected to the annular groove 16 in a sliding seal; the push ring 161 is fixedly connected to the groove wall of the annular groove 16 by a connecting spring 162; the annular groove 16 is connected to the groove 15 by an oil channel 17.

[0026] As an implementation mode of the utility model, a push plate 23 is provided inside the sleeve 2 ; the push plate 23 is fixedly connected to a surface of the sleeve 2 close to the bottom groove 21 by installing a spring 231 .

[0027] As an implementation mode of the utility model, a steel wire rope 24 is fixedly connected to a side of the push plate 23 close to the mounting spring 231; an end of the steel wire rope 24 away from the push plate 23 passes through the sleeve 2; the push plate 23 is made of PTFE material.

[0028] As an implementation mode of the present invention, a storage groove 25 is formed at one end of the sleeve 2 close to the installation spring 231 .

[0029] As an embodiment of the present utility model, a support tube 26 is provided inside the sleeve 2; a threaded groove 27 is provided at one end of the sleeve 2 close to the bottom groove 21; a flange 28 is fixedly connected to the outer wall of the support tube 26; the flange 28 is threadedly connected in the threaded groove 27; the outer wall of the support tube 26 is in sliding sealing contact with the inner wall of the hollow groove 11;

[0030] When working, the shaft length of existing motors is often fixed. However, in some equipment or systems, affected by the installation space and installation layout, it is difficult for a fixed-length shaft to be accurately connected with other mechanical parts. For example, in a narrow or complex installation space, the position of the motor cannot be adjusted, resulting in the shaft being unable to properly connect with other parts. In this case, an additional coupling is required. However, the straightness of the shaft body cannot be controlled by connecting the external output shaft through the coupling, which will affect the normal transmission efficiency of the motor. In this regard, if a motor with a shaft of different length is selected, the operator needs to prepare motors of different specifications as spares, and then repeatedly align and debug the replaced motor, which increases the complexity of the operation and becomes very troublesome.

[0031] In this regard, the utility model sets a sleeve 2 so that the positioning rod 14 is inserted into the mounting hole 22 on the surface of the sleeve 2 and the through hole 13 on the surface of the shaft body 1, thereby fixing the sleeve 2 and the shaft body 1 in a riveted manner, so that the sleeve 2 fixed on the shaft body 1 can increase the length of the shaft body 1, and the sleeve 2 is directly connected to the shaft body 1, which can ensure that the sleeve 2 and the shaft body 1 have a higher centering accuracy. Compared with the coupling, the addition of the sleeve 2 helps to improve the structural rigidity of the shaft, thereby reducing the bending deformation of the shaft and improving the straightness of the shaft body 1; and there is no need for the operator to prepare motors of different specifications as spares, avoiding repeated alignment and debugging of the replaced motor, thereby reducing the complexity of operation, and further improving the practicality of the utility model;

[0032] In the initial state, the shaft body 1 is connected to the motor through the keyway 12 opened on the surface, and the annular groove 16 is filled with hydraulic oil. The sleeve 2 is made of carbon steel material. By adopting the sleeve 2 made of carbon steel material, not only the production cost of the sleeve 2 is reduced, but also the sleeve 2 made of carbon steel material has good mechanical strength and can withstand large loads and pressures, so that the sleeve 2 has good support and stability when connecting other mechanical parts. Moreover, carbon steel can maintain good hardness and toughness under appropriate heat treatment conditions and adapt to different working environments and load requirements; thereby improving the service life and use effect of the sleeve 2; setting the push plate 23 to The push plate 23 is made of PTFE material, so that the surface of the push plate 23 is smooth, so that the friction between the push plate 23 and the inner wall bracket of the sleeve 2 is small, and the influence of the friction on the push plate 23 is reduced, so as to improve the sliding effect of the push plate 23 in the sleeve 2; when it is necessary to increase the length of the shaft body 1 so that the shaft body 1 can be accurately docked with other mechanical parts, the user puts the sleeve 2 on the surface of the shaft body 1, and by adjusting the length of the sleeve 2, while ensuring that the sleeve 2 is accurately docked with other mechanical parts, the mounting hole 22 of the sleeve 2 is aligned with the through hole 13 on the surface of the shaft body 1; after the mounting hole 22 and the through hole 13 are aligned, the shaft body 1 inserted into the sleeve 2 will push the push plate 23 in the sleeve 2 to squeeze the mounting spring. 231 is close to the bottom groove 21 of the sleeve 2; at this time, the push plate 23 is pushed by the restoring force of the installation spring 231 to squeeze the push ring 161, so that the push ring 161 squeezes the connecting spring 162 into the annular groove 16, and the hydraulic oil in the annular groove 16 is squeezed into the groove 15 connected to the annular groove 16, so that the block 151 in the groove 15 will be pushed by the hydraulic oil and extend out of the groove 15; the block 151 extending out of the groove 15 will block the positioning rod 14 from being effectively inserted into the through hole 13, thereby affecting the connection between the sleeve 2 and the shaft body 1; in this regard, by setting a steel wire rope 24, when the user needs to insert the positioning rod 14, first pull the steel wire rope 24 through the sleeve 2, thereby pulling the push plate 23 to move away from the shaft body 1 through the steel wire 24, so that the push plate 23 squeezes the mounting spring 231 to move away from the push ring 161, so that the push ring 161 is no longer squeezed by the push plate 23, so that the push ring 161 extends out of the annular groove 16 under the push of the restoring force of the connecting spring 162, so that the hydraulic oil in the groove 15 flows back to the annular groove 16 through the oil passage 17, so that the block 151 enters the groove 15 under the adsorption of negative pressure, and at this time, the block 151 no longer blocks the through groove, and the user inserts the positioning rod 14 into the mounting hole 22 at this time, so that the positioning rod 14 is inserted into the through hole 13 through the mounting hole 22;Since the surface of the positioning rod 14 is provided with a card groove 141, when the positioning rod 14 is fully inserted into the card groove 141, the card groove 141 on the surface of the positioning rod 14 is directly opposite to the groove 15, and at this time, the wire rope 24 is loosened, so that the installation spring 231 pushes the push plate 23 close to the push ring 161, so that the push ring 161 squeezes the connecting spring 162 into the annular groove 16 under the push of the push plate 23, so that the hydraulic oil in the annular groove 16 is squeezed and enters the groove 15 again, so that the hydraulic oil entering the groove 15 pushes the block 151 to extend out of the groove 15 and enter the card groove 141 on the surface of the positioning rod 14, so that the block 151 clamps the positioning rod 14 into the through hole 13 through the card groove 141 on the surface of the positioning rod 14, so that the positioning rod 14 can stably connect the shaft body 1 and the sleeve 2 Then, insert the support tube 26 into the bottom groove 21 of the sleeve 2 and enter the interior of the sleeve 2 until the support tube 26 is inserted into the hollow groove 11 of the shaft body 1. At this time, the support tube 26 can be in sliding and sealing contact with the hollow groove 11 and the bottom groove 21; when the flange 28 of the support tube 26 moves to the threaded groove 27 of the sleeve 2, rotate the support tube 26 so that the flange 28 of the support tube 26 is threadedly connected in the threaded groove 27, so that the support tube 26 is fixedly connected to the sleeve 2; thereby, the support tube 26 and the sleeve 2 are combined to form a composite structure, which greatly improves the rigidity of the composite structure; so that the support tube 26 and the sleeve 2 can better share and transfer the load, thereby improving the bending and torsion resistance of the sleeve 2; and the support tube 26 is threadedly connected to the sleeve 2 After connection, the formed composite structure can provide better centering accuracy; due to the fixed relationship between the support tube 26 and the sleeve 2, the centering error of the shaft body 1 will be minimized, further reducing the problem of straightness; it also makes the shaft body 1 more stable under load and less likely to bend; the practicality of the utility model is further improved; because the shaft body 1 squeezes the push plate 23 into the interior of the sleeve, the installation spring 231 is compressed, and after the sleeve 2 is connected to the shaft body 1, the pulled wire rope 24 passes through one end of the sleeve 2, and part of the wire rope 24 will extend out of the sleeve 2. The part of the wire rope 24 extending out of the sleeve 2 will not only interfere with the connection between the sleeve 2 and the mechanical structure, but also prevent the flange 28 of the support tube 26 from fitting closely with the sleeve 2, thereby affecting the flange 28 The storage groove 25 is provided, and since the storage groove 25 is provided in an annular shape, the user only needs to wrap the exposed part of the wire rope 24 around the inner ring wall of the storage groove 25, thereby preventing the part of the wire rope 24 extending out of the sleeve 2 from interfering with the connection between the sleeve 2 and the mechanical structure. When the support tube 26 is threadedly connected to the sleeve 2 through the flange 28, the flange 28 will block the storage groove 25, thereby preventing the part of the wire rope 24 stored in the storage groove 25 from leaking out of the storage groove 25; and since the wire rope 24 is stored in the storage groove 25, the wire rope 24 will not block the flange 28 of the support tube 26 from contacting the sleeve 2, thereby improving the tightness of the threaded connection between the flange 28 and the sleeve 2, and improving the connection strength between the support tube 26 and the sleeve 2. ;

[0033] The specific workflow is as follows:

[0034] When working, in the initial state, the annular groove 16 is filled with hydraulic oil. By setting the sleeve 2 to be made of carbon steel material, the sleeve 2 made of carbon steel material not only reduces the production cost of the sleeve 2, but also the sleeve 2 made of carbon steel material has good mechanical strength and can withstand large loads and pressures, so that the sleeve 2 has good support and stability when connecting other mechanical parts. Moreover, carbon steel can maintain good hardness and toughness under appropriate heat treatment conditions and adapt to different working environments and load requirements; thereby improving the service life and use effect of the sleeve 2. When the length of the shaft body 1 needs to be increased so that the shaft body 1 can be accurately connected with other mechanical parts, the user puts the sleeve 2 on the surface of the shaft body 1, and by adjusting the length of the sleeve 2, while ensuring that the sleeve 2 can be accurately connected with other mechanical parts, the mounting hole 22 of the sleeve 2 is aligned with the through hole 13 on the surface of the shaft body 1; after the mounting hole 22 and the through hole 13 are aligned, the shaft body 1 inserted into the sleeve 2 will push the push plate 23 in the sleeve 2 to squeeze the mounting spring 231 close to the bottom groove 21 of the sleeve 2; at this time, the push plate 23 is pushed by the restoring force of the mounting spring 231 to squeeze the push ring 161, so that the push plate 23 The ring 161 squeezes the connecting spring 162 into the annular groove 16. At this time, the hydraulic oil in the annular groove 16 is squeezed into the groove 15 connected to the annular groove 16, so that the block 151 in the groove 15 is pushed by the hydraulic oil and extends out of the groove 15; the block 151 extending out of the groove 15 will block the positioning rod 14 from being effectively inserted into the through hole 13, thereby affecting the connection between the sleeve 2 and the shaft body 1; in this regard, by providing a steel wire rope 24, when the user needs to insert the positioning rod 14, first pull the steel wire rope 24 through one end of the sleeve 2, thereby pulling the push plate 23 away from the shaft through the steel wire rope 24 The push plate 23 moves in the direction of the mounting spring 231 away from the push ring 161, so that the push ring 161 is no longer squeezed by the push plate 23, and the push ring 161 extends out of the annular groove 16 under the push of the restoring force of the connecting spring 162, so that the hydraulic oil in the groove 15 flows back to the annular groove 16 through the oil passage 17, so that the block 151 enters the groove 15 under the adsorption of negative pressure, and the block 151 no longer blocks the through groove. At this time, the user inserts the positioning rod 14 into the mounting hole 22, so that the positioning rod 14 is inserted into the through hole 13 through the mounting hole 22;Since the surface of the positioning rod 14 is provided with a card groove 141, when the positioning rod 14 is fully inserted into the card groove 141, the card groove 141 on the surface of the positioning rod 14 is directly opposite to the groove 15, and at this time, the wire rope 24 is loosened, so that the installation spring 231 pushes the push plate 23 close to the push ring 161, so that the push ring 161 squeezes the connecting spring 162 into the annular groove 16 under the push of the push plate 23, so that the hydraulic oil in the annular groove 16 is squeezed and enters the groove 15 again, so that the hydraulic oil entering the groove 15 pushes the block 151 to extend out of the groove 15 and enter the card groove 141 on the surface of the positioning rod 14, so that the block 151 clamps the positioning rod 14 into the through hole 13 through the card groove 141 on the surface of the positioning rod 14, so that the positioning rod 14 can stably connect the shaft body 1 and the sleeve 2 Then, insert the support tube 26 into the bottom groove 21 of the sleeve 2 and enter the interior of the sleeve 2 until the support tube 26 is inserted into the hollow groove 11 of the shaft body 1. At this time, the support tube 26 can be in sliding and sealing contact with the hollow groove 11 and the bottom groove 21; when the flange 28 of the support tube 26 moves to the threaded groove 27 of the sleeve 2, rotate the support tube 26 so that the flange 28 of the support tube 26 is threadedly connected in the threaded groove 27, so that the support tube 26 is fixedly connected to the sleeve 2; thereby, the support tube 26 and the sleeve 2 are combined to form a composite structure, which greatly improves the rigidity of the composite structure; so that the support tube 26 and the sleeve 2 can better share and transfer the load, thereby improving the bending and torsion resistance of the sleeve 2; and the support tube 26 is threadedly connected to the sleeve 2 After connection, the formed composite structure can provide better centering accuracy; due to the fixed relationship between the support tube 26 and the sleeve 2, the centering error of the shaft body 1 will be minimized, further reducing the problem of straightness; it also makes the shaft body 1 more stable under load and less likely to bend; the practicality of the utility model is further improved; because the shaft body 1 squeezes the push plate 23 into the interior of the sleeve, the installation spring 231 is compressed, and after the sleeve 2 is connected to the shaft body 1, the pulled wire rope 24 passes through one end of the sleeve 2, and part of the wire rope 24 will extend out of the sleeve 2. The part of the wire rope 24 extending out of the sleeve 2 will not only interfere with the connection between the sleeve 2 and the mechanical structure, but also prevent the flange 28 of the support tube 26 from fitting closely with the sleeve 2, thereby affecting the flange 28 The storage groove 25 is provided, and since the storage groove 25 is provided in an annular shape, the user only needs to wrap the exposed part of the wire rope 24 around the inner ring wall of the storage groove 25, thereby preventing the part of the wire rope 24 extending out of the sleeve 2 from interfering with the connection between the sleeve 2 and the mechanical structure. When the support tube 26 is threadedly connected to the sleeve 2 through the flange 28, the flange 28 will block the storage groove 25, thereby preventing the part of the wire rope 24 stored in the storage groove 25 from leaking out of the storage groove 25; and since the wire rope 24 is stored in the storage groove 25, the wire rope 24 will not block the flange 28 of the support tube 26 from contacting the sleeve 2, thereby improving the tightness of the threaded connection between the flange 28 and the sleeve 2, and improving the connection strength between the support tube 26 and the sleeve 2. ;

[0035] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does 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, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0036] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A hollow shaft for a motor, characterized in that: The invention comprises a shaft body (1); a hollow groove (11) is provided inside the shaft body (1); a key groove (12) is provided on the surface of the shaft body (1); a through hole (13) is provided on the surface of the shaft body (1) and is connected to the hollow groove (11); the through hole (13) is located at an end of the shaft body (1) away from the key groove (12); a sleeve (2) is sleeved on the surface of the shaft body (1); a bottom groove (21) is provided at the bottom of the sleeve (2) and is directly opposite to the hollow groove (11); the sleeve (2) is The sleeve (2) is made of carbon steel; a mounting hole (22) matching with the through hole (13) is provided on the surface of the sleeve (2); two groups of mounting holes (22) are provided; the number of mounting holes (22) in each group is four; a positioning rod (14) is slidably connected in the mounting hole (22); a clamping groove (141) is provided on the surface of the positioning rod (14); a groove (15) is provided on the inner wall of the through hole (13); a clamping block (151) is slidably connected in the groove (15).

2. A hollow shaft for a motor according to claim 1, characterized in that: An annular groove (16) is provided on one side of the shaft body (1); a push ring (161) is connected in a sliding seal in the annular groove (16); the push ring (161) is fixedly connected to the groove wall of the annular groove (16) via a connecting spring (162); and the annular groove (16) and the groove (15) are connected via an oil passage (17).

3. A hollow shaft for a motor according to claim 2, characterized in that: A push plate (23) is arranged inside the sleeve (2); the push plate (23) is fixedly connected to a side of the sleeve (2) close to the bottom groove (21) via a mounting spring (231).

4. A hollow shaft for a motor according to claim 3, characterized in that: A steel wire rope (24) is fixedly connected to one side of the push plate (23) close to the mounting spring (231); one end of the steel wire rope (24) away from the push plate (23) passes through the sleeve (2); and the push plate (23) is made of PTFE material.

5. A hollow shaft for a motor according to claim 4, characterized in that: The sleeve (2) is provided with a storage groove (25) at one end close to the mounting spring (231).

6. A hollow shaft for a motor according to claim 5, characterized in that: A support tube (26) is arranged inside the sleeve (2); a threaded groove (27) is provided at one end of the sleeve (2) close to the bottom groove (21); a flange (28) is fixedly connected to the outer wall of the support tube (26); the flange (28) is threadedly connected in the threaded groove (27); the outer wall of the support tube (26) is in sliding sealing contact with the inner wall of the hollow groove (11).

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