Tool for preventing damage to oil seal during motor assembly and its usage method

Abstract

The present application relates to a tool for preventing damage to an oil seal during the assembly of an electric motor and a method for using the same, belonging to the technical field of electric motor assembly. The tool includes a bushing having a tapered tube structure that can be inserted into the end cover oil seal of the electric motor and allows the rotor shaft of the electric motor to pass through; a guide rod including a rod portion and a head connected to the end of the rod portion. When the rod portion is inserted into the bushing, the head abuts against the small-diameter end of the tapered tube structure and has a guiding surface that can be matched and engaged with the outer peripheral edge of the small-diameter end of the tapered tube structure. The present application has the effect of preventing damage to the oil seal during the assembly of the electric motor end cover and the shaft.

Description

Technical Field

[0001] This application relates to the technical field of motor assembly, and particularly to a tool for preventing damage to oil seals during motor assembly and its usage method. Background Art

[0002] An oil seal is a common name for a general seal. Simply put, it is the seal of lubricating oil. It is a mechanical component used to seal grease, isolating the components that need lubrication in the transmission components from the output components, so as to prevent the leakage of lubricating oil.

[0003] Oil seals are also commonly used between the motor end cover and the rotating shaft of the rotor. In the existing process of assembling the motor end cover and the rotating shaft, usually the oil seal is first installed on the motor end cover, and then the motor end cover is installed on the rotating shaft of the rotor.

[0004] However, due to the working characteristics of the oil seal, the inner diameter of the oil seal is smaller than the diameter of the rotating shaft before assembly, and the rotating shaft of the rotor is likely to damage the oil seal when passing through the oil seal. Summary of the Invention

[0005] In order to prevent damage to the oil seal during the assembly of the motor end cover and the rotating shaft, this application provides a tool for preventing damage to the oil seal during motor assembly and its usage method.

[0006] In a first aspect, this application provides a tool for preventing damage to the oil seal during motor assembly and its usage method, adopting the following technical solutions:

[0007] A tool for preventing damage to the oil seal during motor assembly includes

[0008] a bushing, including a tapered tube structure that can be inserted into the oil seal of the motor end cover and allows the rotating shaft of the motor rotor to pass through;

[0009] a guide rod, including a rod portion and a head connected to the end of the rod portion. The head can abut against the small-diameter end of the tapered tube structure when the rod portion is inserted into the bushing, and has a guiding surface that can be matched and joined with the outer peripheral edge of the small-diameter end of the tapered tube structure.

[0010] By adopting the above technical solution, when assembling the motor end cover and the rotor shaft, first insert the guide rod into the bushing and make the head abut against the small-diameter end of the tapered tube structure. At this time, the edge of the head guiding surface is engaged with the outer periphery of the small-diameter end of the tapered tube structure; insert the inserted bushing and guide rod into the oil seal of the motor end cover, and make the head advance towards the oil seal. After the head passes through the oil seal, the outer peripheral surface of the tapered tube structure expands the oil seal. At this time, remove the guide rod, sleeve the motor end cover with the bushing onto the rotor shaft, insert the shaft into the bushing, and finally remove the bushing to complete the assembly of the motor end cover and the rotor shaft, preventing damage to the oil seal during the assembly process of the motor end cover and the shaft.

[0011] Optionally, at least part of the inner peripheral surface of the tapered tube structure is a cylindrical surface that cooperates with the rod portion, and the diameter of its inner peripheral surface is 1.005 to 1.01 times the diameter of the rotor shaft. The outer peripheral surface of the tapered tube structure is a conical surface with a taper of 8° to 12°, and the minimum diameter of its conical surface is 1.03 to 1.035 times the diameter of the rotor shaft.

[0012] By adopting the above technical solution, the wobbling generated after the rod portion is inserted into the tapered tube structure can be reduced, and the stability between the tapered tube structure and the rod portion is improved; on the premise of facilitating the stable insertion of the rotor shaft, the expansion degree of the end cover oil seal is minimized as much as possible.

[0013] Optionally, the outer diameter of the rod portion of the guide rod is 1 to 1.005 times the diameter of the rotor shaft.

[0014] By adopting the above technical solution, the rod portion can be more easily inserted into the tapered tube structure, and the stability of the rod portion after being inserted into the tapered tube structure is ensured.

[0015] Optionally, a relief groove is provided at a position on the rod portion close to the head, and the circumferential width of the relief groove is smaller than the circumferential width of the circumferential surface.

[0016] Optionally, the bushing includes a holding flange fixedly provided at the large-diameter end of the tapered tube structure.

[0017] By adopting the above technical solution, it is more convenient to hold the tapered tube structure, and it is more convenient to remove the bushing after the tapered tube structure is inserted into the end cover oil seal and the shaft is inserted into the tapered tube structure.

[0018] Optionally, anti-slip patterns are provided on the outer peripheral surface of the holding flange.

[0019] By adopting the above technical solution, the friction of the holding flange is increased.

[0020] Optionally, the rod portion of the guide rod is at least 1 cm longer than the bushing.

[0021] By adopting the above technical solution, after the rod part of the guide rod is inserted into the tapered tube structure of the bushing, due to the limit setting of the head of the guide rod and the small-diameter end of the tapered tube structure, the whole workpiece can be picked up only by holding the part of the rod protruding from the bushing, and the overall operation is more convenient.

[0022] Optionally, the manufacturing materials of the guide rod and the bushing are stainless steel or aluminum alloy.

[0023] By adopting the above technical solution, the guide rod and the bushing are made more durable and environmentally friendly and recyclable.

[0024] Optionally, the guiding surface of the head is a spherical crown or a conical surface that can be exposed outside the tapered tube structure after the rod part is inserted into the bushing.

[0025] By adopting the above technical solution, when the guiding surface of the head with a spherical crown or conical surface is inserted into the end cover oil seal, it can further prevent the oil seal from being damaged.

[0026] In a second aspect, the present application provides a method for using a tool to prevent damage to an oil seal during the motor assembly process, adopting the following technical solution:

[0027] The method for using a tool to prevent damage to an oil seal during the motor assembly process includes the following steps:

[0028] S1. Insert the guide rod into the bushing until the head of the guide rod abuts against the small-diameter end of the tapered tube structure of the bushing;

[0029] S2. Adjust the head of the guide rod of this workpiece to face the end cover of the motor, insert it into the end cover oil seal in the motor end cover, and expand the end cover oil seal through the bushing;

[0030] S3. Take out the guide rod from the bushing;

[0031] S4. Set the motor end cover together with the bushing onto the rotor shaft of the motor, and make the rotor shaft pass through the bushing;

[0032] S5. Remove the bushing.

[0033] By adopting the above technical solution, after the rod part of the guide rod is inserted into the tapered tube structure of the bushing, hold one end of the rod protruding from the tapered tube structure, and the whole workpiece can be picked up, and the head of the guide rod is aligned with the end cover of the motor and inserted. The outer peripheral surface of the tapered tube structure expands the end cover oil seal. At this time, the guide rod can be removed, the motor end cover with the bushing is sleeved onto the rotor shaft, the rotor shaft is inserted into the tapered tube structure, and then the tapered tube structure is removed, and the assembly of the motor end cover and the rotor shaft can be completed, preventing damage to the oil seal when the rotor shaft is inserted.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. First, insert the guide rod into the bushing, then insert the assembled bushing and guide rod into the oil seal of the motor end cover. After the head passes through the oil seal, the outer peripheral surface of the tapered tube structure expands the oil seal. At this time, remove the guide rod. After inserting the rotor shaft into the bushing, then remove the bushing, preventing damage to the oil seal during the assembly process of the motor end cover and the shaft.

[0036] 2. The settings of the inner diameter and outer diameter of the tapered tube structure can reduce the shaking generated after the rod part is inserted into the tapered tube structure, improving the stability between the tapered tube structure and the rod part; on the premise of facilitating the stable insertion of the rotor shaft, the expansion degree of the end cover oil seal is minimized as much as possible.

[0037] 3. After the rod part of the guide rod is inserted into the tapered tube structure of the bushing, due to the limit settings of the head of the guide rod and the small-diameter end of the tapered tube structure, only by holding the part of the rod that protrudes from the bushing can the entire workpiece be picked up, making the overall operation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic structural diagram of an embodiment of the present application;

[0039] Figure 2 is an exploded schematic diagram of an embodiment of the present application;

[0040] Figure 3 is a cross-sectional view showing the shape of the bushing;

[0041] Figure 4 is a cross-sectional view showing the shape of the guide rod.

[0042] Description of the reference numerals: 1. Bushing; 11. Tapered tube structure; 12. Holding flange; 121. Anti-slip lines; 2. Guide rod; 21. Rod part; 211. Relief groove; 22. Head. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] The following Figures 1-4 further describes the present application in detail with reference to the

[0044] An embodiment of the present application discloses a tool for preventing damage to the oil seal during the assembly of a motor.

[0045] Refer to Figure 1 and Figure 2The tool for preventing the oil seal from being damaged during the motor assembly process includes a bushing 1 and a guide rod 2. The bushing 1 includes a conical tube structure 11 for inserting into the end cover oil seal of the motor, and a holding flange 12 fixedly sleeved on the large-diameter end of the conical tube structure 11. The interior of the conical tube structure 11 is used for the rotor shaft of the power supply machine to penetrate; the guide rod 2 includes a rod portion 21 which is cylindrically arranged and used to be inserted into the conical tube structure 11, and a head portion 22 fixed at one end of the rod portion 21. When the rod portion 21 is inserted into the conical tube structure 11, the head portion 22 abuts against the small-diameter end of the conical tube structure 11, and the edges around the head portion 22 match and combine with the outer edges of the small-diameter end of the conical tube structure 11.

[0046] When assembling the motor end cover and the rotor shaft, first insert the rod portion 21 into the conical tube structure 11, and make the head portion 22 abut against the small diameter end of the conical tube structure 11, then insert the head portion 22 of the entire workpiece toward the motor end cover. After the head portion 22 passes through the oil seal, the outer circumference of the conical tube structure 11 expands against the end cover oil seal, then remove the guide rod 2, put the motor end cover on the rotor shaft, make the rotor shaft pass through the conical tube structure 11, and then pull out the conical tube structure 11, thereby preventing the oil seal from being damaged during the assembly process of the motor end cover and the rotor shaft.

[0047] refer to Figure 1 and Figure 3 The inner circumference of the conical tube structure 11 is a cylindrical surface, the inner diameter D1 of the conical tube structure 11 is 1.005 to 1.01 times the diameter of the rotor shaft, the taper C of the outer circumference of the conical tube structure 11 is 8° to 12°, and the minimum diameter D2 of the conical surface is 1.03 to 1.035 times the diameter of the rotor shaft. Firstly, the internal space of the conical tube structure 11 minimizes the gap between the inner circumference of the conical tube structure 11 and the outer circumference of the rotor shaft while facilitating the insertion of the rotor shaft. The conical tube structure 11 is set with a taper and a diameter of the outer circumference, in order to minimize the taper and thickness of the conical tube structure 11 while ensuring its strength, so as to reduce the expansion degree of the end cover oil seal.

[0048] refer to Figure 4 The diameter D3 of the rod 21 is 1 to 1.005 times the diameter of the rotor shaft. On the one hand, it is convenient for inserting the rod 21 into the conical tube structure 11. On the other hand, it can improve the stability of the rod 21 after inserting the conical tube structure 11 and reduce the possible shaking of the rod 21.

[0049] The above multiples and tapers are verified through experiments. When the above ranges are selected, the functions of this application can be better realized.

[0050] Replay Figure 1 The outer peripheral surface of the holding flange 12 is provided with anti-skid patterns 121, which can increase the friction when holding and facilitate the final removal of the cone tube structure 11 from the motor end cover.

[0051] Reference Figure 1 and Figure 2 , the end face of the head 22 facing away from the end face of the bushing 1 is a convex spherical crown or conical surface. When the rod portion 21 is inserted into the tapered tube structure 11 and the head 22 is inserted toward the motor end cover, the end face of the head 22 first passes through the end cover oil seal, which can play a guiding role to avoid damage to the oil seal.

[0052] Reference Figure 1 , the length of the rod portion 21 is at least 1 cm longer than the length of the bushing 1, and the end of the rod portion 21 away from the head 22 is provided with a rounded corner; after the rod portion 21 is inserted into the bushing 1 and the head 22 abuts against the small-diameter end of the tapered tube structure 11, the end of the rod portion 21 away from the head 22 can extend out of the bushing 1. One can simply hold the end of the rod portion 21 protruding from the bushing 1 to pick up the entire workpiece, which is more convenient for operation. The manufacturing materials of the bushing 1 and the guide rod 2 are stainless steel, aluminum alloy, or other sturdy, durable, and recyclable materials.

[0053] Reference Figure 2 , to meet the production requirements, an annular relief groove 211 is provided at one end of the outer peripheral surface of the rod portion 21 close to the head 22; the circumferential width of the relief groove 211 is smaller than the length of the tapered tube structure 11, which can ensure the stability of the rod portion 21 after being inserted into the tapered tube structure 11.

[0054] The implementation principle of the tool for preventing damage to the oil seal during the motor assembly in the embodiment of the present application is as follows: When assembling the motor end cover and the rotor shaft, insert the rod portion 21 into the tapered tube structure 11 so that the head 22 abuts against the small-diameter end of the tapered tube structure 11. Hold the end of the rod portion 21 protruding from the bushing 1 and insert the head 22 of the entire workpiece toward the motor end cover. After the convex spherical crown or conical surface of the head 22 passes through the oil seal, the outer peripheral surface of the tapered tube structure 11 expands the end cover oil seal. Then remove the guide rod 2, sleeved the motor end cover onto the rotor shaft. After the rotor shaft passes through the tapered tube structure 11, then remove the tapered tube structure 11 by holding the flange 12, and the assembly of the motor end cover and the rotor shaft can be completed, preventing damage to the oil seal during the assembly of the motor end cover and the rotor shaft.

[0055] The embodiment of the present application also discloses a method for using a tool for preventing damage to the oil seal during the motor assembly.

[0056] The method for using a tool for preventing damage to the oil seal during the motor assembly includes the following steps:

[0057] S1. Insert the guide rod 2 into the bushing 1 until the head 22 of the guide rod 2 abuts against the small-diameter end of the tapered tube structure 11 of the bushing 1;

[0058] S2. Adjust the head 22 of the guide rod 2 of this workpiece towards the end cover of the motor, insert it into the end cover oil seal inside the motor end cover, and expand the end cover oil seal through the bushing 1;

[0059] S3. Take out the guide rod 2 from the bushing 1;

[0060] S4. Set the motor end cover together with the bushing 1 onto the rotor shaft of the motor, such that the rotor shaft passes through the bushing 1;

[0061] S5. Remove the bushing 1.

[0062] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A tool for preventing damage to oil seals during the motor assembly process, characterized in that: Comprising A bushing, including a tapered tube structure capable of being inserted into the end cover oil seal of the motor and allowing the rotor shaft of the motor to pass through; A guide rod, including a rod portion and a head connected to the end of the rod portion, the head being able to abut against the small-diameter end of the tapered tube structure when the rod portion is inserted into the bushing, and having a guiding surface capable of matingly engaging with the outer peripheral edge of the small-diameter end of the tapered tube structure; At least a part of the inner peripheral surface of the tapered tube structure (11) is a cylindrical surface that cooperates with the rod portion (21), the diameter of its inner peripheral surface being 1.005 to 1.01 times the diameter of the rotor shaft, and the outer peripheral surface of the tapered tube structure (11) is a conical surface with a taper of 8° to 12°, the minimum diameter of its conical surface being 1.03 to 1.035 times the diameter of the rotor shaft; A relief groove (211) is provided at a position on the rod portion (21) close to the head (22), and the circumferential width of the relief groove (211) is smaller than the circumferential width of the cylindrical surface in the tapered tube structure (11).

2. The tool for preventing damage to the oil seal during the motor assembly process according to claim 1, wherein: The outer diameter of the rod portion (21) of the guide rod (2) is 1 to 1.005 times the diameter of the rotor shaft.

3. The tool for preventing damage to the oil seal during the motor assembly process according to any one of claims 1 to 2, characterized in that: The bushing (1) includes a holding flange (12) fixedly provided at the large-diameter end of the tapered tube structure (11).

4. The tool for preventing damage to the oil seal during the motor assembly process according to claim 3, characterized in that: Anti-slip patterns (121) are provided on the outer peripheral surface of the holding flange (12).

5. The tool for preventing damage to the oil seal during the motor assembly process according to any one of claims 1 to 2, characterized in that: The rod portion (21) of the guide rod (2) is at least 1 cm longer than the bushing (1).

6. The tool for preventing damage to the oil seal during the motor assembly process according to any one of claims 1 to 2, characterized in that: The manufacturing materials of the guide rod (2) and the bushing (1) are stainless steel or aluminum alloy.

7. The tool for preventing damage to the oil seal during the motor assembly process according to any one of claims 1 to 2, characterized in that: The guiding surface of the head (22) is a spherical crown or a conical surface that can be exposed outside the tapered tube structure (11) after the rod portion (21) is inserted into the bushing (1).

8. The method of using the tool for preventing damage to the oil seal during the motor assembly process according to any one of claims 1 to 7, characterized in that: Comprising the following steps: S1. Insert the guide rod (2) into the bushing (1) until the head (22) of the guide rod (2) abuts against the small-diameter end of the tapered tube structure (11) of the bushing (1); S2. Adjust the head (22) of the guide rod (2) of this workpiece towards the end cover of the motor, insert it into the end cover oil seal inside the motor end cover, and expand the end cover oil seal through the bushing (1); S3. Remove the guide rod (2) from the bushing (1); S4. Sleeve the motor end cover together with the bushing (1) onto the rotor shaft of the motor, so that the rotor shaft passes through the bushing (1); S5. Remove the bushing (1).

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