A motor outer oil seal installation, withdrawal auxiliary device and method

Abstract

The application provides a motor outer oil seal installation and withdrawal auxiliary device and method, which comprises a pull rod, a thrust device and an intermediate assembly arranged on the pull rod; one end of the pull rod is arranged in a central hole of an end portion of a rotating shaft, the other end is provided with a stop block, the thrust device is located on the side of the stop block close to the rotating shaft; one end of the intermediate assembly is connected with a process screw hole on the outer oil seal by using a fastener, the stop block limits the thrust device, a push rod of the thrust device pushes the other end of the intermediate assembly, and the outer oil seal is installed on the rotating shaft. Further, the intermediate assembly is improved, a part of which is used for connecting with the outer oil seal, and a part of which bears the thrust of the thrust device, which are respectively a backing plate and a adapter plate. The mechanism of the backing plate and the adapter plate is optimized, and the installation and withdrawal operations of the outer oil seal can be completed only by interchanging the installation positions of the backing plate and the adapter plate, thereby saving the tooling manufacturing cost. The outer oil seal installation device is designed to be exquisite, convenient to install and use, and convenient to carry, and can be suitable for different working environments.

Description

Technical Field

[0001] This invention relates to the field of motor manufacturing technology, and more specifically, to an auxiliary device and method for installing and removing an external oil seal for a motor. Background Technology

[0002] Motor bearing assemblies typically consist of components such as end covers, bearings, bearing covers, and external oil seals. The external oil seal is generally a disc-shaped structure that is mounted on the shaft and rotates with the shaft during motor operation. To ensure that the external oil seal does not slip on the shaft during operation, the external oil seal and the shaft are generally fitted with an interference fit.

[0003] In existing technology, the external oil seal is installed using a heat-fitting method. This typically involves heating the external oil seal to a certain temperature, causing the inner bore of the seal to expand and changing the fit between the seal and the shaft from an interference fit to a clearance fit. The seal is then heat-fitted onto the shaft. A pressure-holding device is then used to apply axial pressure to the end face of the external oil seal to ensure that no gap appears between the seal and the bearing inner ring after cooling. To remove the external oil seal, it is heated using flame heating or induction heating to change the fit between the seal and the shaft from an interference fit to a clearance fit, after which the seal is removed. Alternatively, a specialized puller can be designed using the process screw holes on the external oil seal to remove it.

[0004] While the above-described technical solutions can resolve the issues of external oil seal installation and removal, they also have the following drawbacks:

[0005] (1) Special equipment is required to heat the external oil seal, which wastes energy and the equipment purchase cost is relatively high. Some factories may not meet the equipment requirements.

[0006] (2) Waiting is required during the heating of the external oil seal, which affects work efficiency.

[0007] (3) The external oil seal pressure holding tool and the drawing tool are not interchangeable, which increases production costs.

[0008] To address the first and second technical problems, the following two patents provide a cold-press installation method. Patent No. 201921278328.4, entitled "An Oil Seal Installation Device for a Drive Motor of a New Energy Electric Vehicle," includes: a guide sleeve for being fitted over the motor shaft, its head having a top post and a limiting step, wherein the top post is used to abut against the oil seal workpiece and can extend into the oil seal installation hole of the front cover; and a striking block, fitted over the guide sleeve and capable of sliding along the length of the guide sleeve, for applying impact force to the guide sleeve, wherein the striking block repeatedly strikes the head of the guide sleeve to ensure the oil seal workpiece is evenly stressed and enters the oil seal installation hole of the front cover, and the oil seal workpiece is installed in place when the limiting step is in contact with the end face of the oil seal installation hole of the front cover. Because the oil seal is interference-fitted with the motor shaft, a considerable amount of force is required to install the oil seal properly without heating it. This patent uses the impact force generated by striking the striking block to drive the oil seal into the installation position. However, this method often results in problems such as oil seal deformation, misalignment, or crushing due to excessive striking.

[0009] The patent application, numbered 202011520553.1, is titled "An Oil Seal Installation Fixture." During oil seal installation, the tool provides uniform force and controllable pressing depth. Its working principle involves adjusting the spring compression using a knob handle to control the pressing depth of the oil seal, meeting the installation requirements of different motors and possessing versatility. The positioning block, guide sleeve, and adjusting block are all aligned to ensure the alignment of the oil seal with the shaft, allowing the oil seal to be smoothly pressed into the end cover mounting hole along the shaft. This ensures stable and proper installation of the oil seal, preventing over-pressing and crushing. It also allows for adjustable pressing depth, meeting the installation requirements of different motor specifications and possessing versatility. However, this patent requires additional thrust or pressure at the protruding force application block during pressing, necessitating additional thrust equipment. Furthermore, the positioning block, guide sleeve, and adjusting block need to be aligned before pressing, resulting in low work efficiency.

[0010] The following patents are also related to oil seal installation:

[0011] The application number is 202021106254.9, and the patent name is a skeleton oil seal mounting sleeve for motor assembly.

[0012] The application number is 201621277754.2, and the patent name is an oil seal installation tooling for a permanent magnet synchronous hydraulic generator.

[0013] The application number is 201520071639.9, and the patent name is a axial surface oil seal mounting sleeve gasket structure.

[0014] All of the above patents only involve the installation of oil seals, not the removal of oil seals, and there are no oil seal auxiliary devices that involve both installation and removal. Summary of the Invention

[0015] The technical problem this invention aims to solve is the shortcomings of existing technologies, such as low efficiency and the need for heating equipment in hot-fitting installation, and poor pressing quality and low work efficiency in cold-pressing installation. This invention provides a cold-pressing installation device for motor external oil seals that eliminates the need for heating and waiting, resulting in high pressing efficiency and good pressing quality. Furthermore, this invention also solves the technical problem that existing technologies require two sets of equipment for oil seal installation and removal, leading to high tooling costs.

[0016] The above-mentioned objectives of the present invention are achieved through the following technical solutions:

[0017] An auxiliary device for installing and removing an external oil seal for a motor includes a pull rod, a thrust device sleeved on the pull rod, and an intermediate component. One end of the pull rod is placed in the central threaded hole at the end of a rotating shaft, and the other end is provided with a stop block. The thrust device is located on the side of the stop block near the rotating shaft. One end of the intermediate component is connected to the process threaded hole on the external oil seal using fasteners. The stop block limits the thrust device, and the push rod of the thrust device pushes the other end of the intermediate component to install the external oil seal onto the rotating shaft.

[0018] The thrust device provides power to push the intermediate component, pressing the outer oil seal onto the rotating shaft, where the tie rod serves for positioning and support. This invention's auxiliary device for installing the outer oil seal employs cold-pressing installation, eliminating the need for heating and waiting, reducing energy consumption, and significantly improving work efficiency.

[0019] Furthermore, the intermediate component includes a pad and an adapter plate. One end of the pad is connected to the adapter plate via a connector. The connection of one end of the intermediate component to the process screw hole on the outer oil seal using fasteners means that the adapter plate is connected to the process screw hole on the outer oil seal using fasteners. The pad bears the thrust of the thrust device and then transmits the thrust to the adapter plate to press the outer oil seal into the rotating shaft.

[0020] The intermediate components include a pad and an adapter plate. Pressure is applied to the adapter plate through the pad to press the outer oil seal into the shaft.

[0021] Furthermore, one end of the adapter plate is connected to the process screw hole on the outer oil seal assembly using fasteners, and the other end is detachably connected to the thrust device. The pad and the adapter plate are also detachably connected via connectors. When installing the outer oil seal, the other end of the adapter plate is not connected to the thrust device. The outer oil seal, adapter plate, pad, and thrust device are sequentially fitted onto the pull rod, with the pad connected to the adapter plate. The push rod of the thrust device pushes the pad to move towards the shaft, installing the outer oil seal onto the shaft. When removing the outer oil seal, the other end of the adapter plate is connected to the thrust device. The pad, adapter plate, and thrust device are sequentially fitted onto the pull rod. The push rod of the thrust device passes through the adapter plate, and the thrust acts on one end of the pad. The other end of the pad contacts the end of the shaft, and the resulting reaction force is transmitted to the outer oil seal through the adapter plate, thus pulling the outer oil seal out.

[0022] Furthermore, the detachable connection between the pad and the adapter plate via a connector means that one end of the pad has an external thread, and one end of the adapter plate has an internal thread that matches the external thread, allowing the adapter plate and the pad to be connected by threads. Preferably, the pad is T-shaped, with the external thread located at the end of the T-shaped pad with the smaller outer diameter.

[0023] Furthermore, the adapter plate has a countersunk hole at one end near the outer oil seal. The diameter of the countersunk hole is larger than the outer diameter of the pad, so that the pad can be partially or completely accommodated in the countersunk hole. The outer diameter of the pad is less than or equal to the outer diameter of the shaft, so that the push rod of the thrust device can pass through the adapter plate to apply a thrust to the pad accommodated in the countersunk hole. The resulting reaction force is transmitted to the outer oil seal through the adapter plate, which can pull the outer oil seal out.

[0024] Furthermore, the other end of the adapter plate being detachably connected to the thrust device means that the thrust device has external threads that are compatible with the internal threads of the adapter plate, allowing the adapter plate and the thrust device to be connected by threads.

[0025] Furthermore, based on the structure for installing the outer oil seal, the present invention makes simple improvements to the pad and adapter plate, enabling the device to also be used for removing the outer oil seal. Specifically: an external thread one is provided on the thrust device, an external thread two identical to the external thread one is provided on the pad, one end of the adapter plate is provided with an internal thread, and the other end has a countersunk hole to accommodate the pad. During oil seal installation, the thrust device, pad, adapter plate, and outer oil seal are arranged sequentially. The external thread two of the pad is adapted to the internal thread of the adapter plate. The thrust device applies pressure to the pad, pressing the outer oil seal onto the rotating shaft. During oil seal removal, the pad is reversed for installation. The thrust device, adapter plate, outer oil seal, and pad are arranged sequentially. The external thread one of the thrust device is adapted to the internal thread of the adapter plate. The thrust device applies pressure to the pad, causing the pad to contact the end of the rotating shaft, transmitting the thrust to the rotating shaft. The resulting reaction force pulls the outer oil seal off the rotating shaft. This invention eliminates the need for heating during both the installation and removal of the external oil seal; the thrust device can be activated directly, significantly improving work efficiency. Furthermore, simple modifications to the gasket and adapter plate resolve the cumbersome and costly technical issues of existing technologies that require separate equipment for installing and removing the oil seal.

[0026] It is important to note that the other end of the adapter plate can be detachably connected to the thrust device, but it is not connected to the push rod of the thrust device.

[0027] Furthermore, the countersunk hole includes a countersunk platform, which is located on the end face of the countersunk hole facing the outer oil seal. The diameter of the countersunk platform is larger than the outer diameter of the shaft to avoid interference with the shaft when installing the outer oil seal.

[0028] Furthermore, the remaining part of the countersunk hole is countersunk platform two, which communicates with countersunk platform one, and the length of the pad is less than or equal to the sum of the depths of countersunk platform one, countersunk platform two, and the countersunk platform at the end of the rotating shaft.

[0029] Furthermore, the thrust device is a jack, and the fact that one end of the thrust device that pushes the intermediate component has an external thread means that the outer shell of the jack has an external thread, and the thrust device push rod refers to the jack push rod.

[0030] Furthermore, the stop is a nut, and the pull rod has threads that match the nut. The stop is installed on the pull rod via a threaded connection. The stop is crucial in that it limits the thrust device during the installation and removal of the outer oil seal, allowing the thrust to be applied. When the stop is a nut, it facilitates the installation and removal of the thrust device, pad, adapter plate, and outer oil seal on the pull rod.

[0031] The present invention also provides a method for installing and removing an external oil seal of a motor, characterized in that it uses the above-described auxiliary device for installing and removing an external oil seal of a motor, and the steps are as follows:

[0032] (1) Connect the pad to the adapter plate;

[0033] (2) Use fasteners to connect the adapter plate to the process screw holes on the end face of the outer oil seal, so that the pad, adapter plate and outer oil seal form a whole, which is called the outer oil seal assembly;

[0034] (3) Install the tie rod in the center screw hole of the shaft;

[0035] (4) Install the outer oil seal assembly onto the tie rod, with the pad facing outwards;

[0036] (5) Then install the thrust device and the stop block on the tie rod in sequence;

[0037] (6) Apply lifting force through the thrust device to push the outer oil seal assembly toward the shaft until the lifting display pressure suddenly rises. At the same time, observe that the outer oil seal end face is flush with the shaft end face, which indicates that the outer oil seal is installed in place.

[0038] (7) Remove the stop block, thrust device, and pad from the pull rod; loosen the fasteners connecting the mounting hole of the adapter plate and the process screw hole on the outer oil seal end face, and remove the adapter plate from the pull rod; unscrew the pull rod out of the center screw hole of the shaft;

[0039] (8) When removing the outer oil seal, install the pull rod in the center screw hole of the shaft;

[0040] (9) Fit the pad onto the tie rod, wherein the end face of one end of the pad is in contact with the countersunk of the rotating shaft;

[0041] (10) Fit the adapter plate onto the tie rod and connect the adapter plate to the thrust device;

[0042] (11) Mount the thrust device onto the tie rod so that the mounting hole of the adapter plate is aligned with the process screw hole on the outer oil seal end face, and then fix the fastener through the mounting hole of the adapter plate into the process screw hole on the outer oil seal end face.

[0043] (12) Apply a lifting force to the pad by the thrust device, and the resulting reaction force is transmitted to the outer oil seal through the adapter plate, which can pull the outer oil seal out.

[0044] The present invention has the following beneficial effects:

[0045] This invention discloses an auxiliary device and method for installing and removing an external oil seal for a motor. The device includes a pull rod, a stop block, a thrust device, and an intermediate component. The thrust device provides power, and the intermediate component presses the external oil seal into the rotating shaft. This method uses cold pressing to install the external oil seal, eliminating the need for heating and waiting, reducing energy consumption, and significantly improving work efficiency. Furthermore, the intermediate component is improved, with one part connecting to the external oil seal and the other part bearing the thrust of the thrust device. These are a pad and an adapter plate, respectively. The mechanisms of the pad and adapter plate are optimized; simply interchangeing their installation positions completes the installation and removal of the external oil seal, saving tooling manufacturing costs. Specifically: 1. Whether installing or removing the oil seal, the adapter plate remains fixed to the outer oil seal, and the pad always bears the thrust of the push rod; 2. The adapter plate can be fixed to both the thrust device and the pad; 3. The pad can be connected to the adapter plate or housed within it. These three functions are achieved through two simple structural components: the pad and the adapter plate. This invention's outer oil seal installation device is ingeniously designed, easy to install and use, portable, and suitable for various working environments. Attached Figure Description

[0046] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0047] Figure 1 This is a schematic diagram of an auxiliary device for installing and removing an external oil seal on a motor (when installing the external oil seal).

[0048] Figure 2 This is a schematic diagram of the external oil seal installation.

[0049] Figure 3 This is a diagram showing the removal of the external oil seal.

[0050] Figure 4 This is a schematic diagram of the tie rod structure.

[0051] Figure 5 Sectional view of the pad.

[0052] Figure 6 This is the right view of the adapter plate.

[0053] Figure 7 yes Figure 6 Adapter plate, AA direction cross section view.

[0054] End cap 11, bearing 12, bearing cover 13, outer oil seal 14, center threaded hole at the end of the shaft 15, countersunk plate at the end of the shaft 16, rotor 17; tie rod 2; nut 3; thrust device 4; pad 5, center hole 51 of the pad, external thread 52 of the pad; adapter plate 6, countersunk plate one 61, countersunk plate two 62, internal threaded hole 63, mounting hole 64; fastening bolt 7. Detailed Implementation

[0055] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0056] As analyzed in the background section, existing technologies employ a heat-shrink installation method. This involves heating the outer oil seal to expand its inner bore before heat-shrinking and installing it onto a rotating shaft. Removing the outer oil seal from the shaft is similar: first heating the outer oil seal to expand its inner bore, then removing it from the shaft. This heat-shrink installation method requires both heating and pressure-holding equipment, resulting in a cumbersome process, numerous working devices, and high costs. To address the technical problems of the heat-shrink installation method, existing technologies have also designed cold-press installation methods and oil seal installation fixtures. However, these fixtures suffer from complexity in use, poor pressurization quality, and require two different sets of equipment for installing and removing the outer oil seal. This application features a method that eliminates the need for heating, offers high efficiency, provides good pressurization quality, and allows for the installation and removal of the outer oil seal using a single, simple set of equipment. It is important to note that the installation and removal of the outer oil seal are in opposite directions. How can this be achieved? Details are as follows:

[0057] In this embodiment, the shaft has a central threaded hole at its tail and a countersunk plate at its end.

[0058] like Figure 1 As shown, an auxiliary device for installing and removing an external oil seal of a motor is provided, including a pull rod 2, a thrust device 4 sleeved on the pull rod 2, and an intermediate component; as shown Figure 2 and Figure 3 As shown, one end of the pull rod 2 is placed in the central threaded hole 15 at the end of the rotating shaft, and the other end is provided with a stop. The thrust device 4 is located on the side of the stop near the rotating shaft. One end of the intermediate component is connected to the process screw hole on the outer oil seal 14 with a fastening bolt 7. The stop limits the thrust device 4. The push rod of the thrust device 4 pushes the other end of the intermediate component to install the outer oil seal 14 onto the rotating shaft.

[0059] like Figure 4As shown, both ends of the pull rod 2 are provided with external threads. One end of the pull rod 2 is threadedly connected to the central threaded hole 15 at the tail of the rotating shaft. A stop block, which is a nut 3, is engaged with the external thread at the other end of the pull rod 2. The pull rod 2 serves to install and fix the pull rod, provides tension when installing the outer oil seal 14, and provides support when removing the outer oil seal 14.

[0060] The intermediate component includes a pad 5 and an adapter plate 6. One end of the pad 5 is connected to the adapter plate 6 via a connector. The intermediate component is connected to the process screw hole on the outer oil seal 14 via the adapter plate 6 using fastening bolts 7. The pad 5 bears the thrust of the push rod of the thrust device 4, and then transmits the thrust to the adapter plate 6 to press the outer oil seal 14 into the rotating shaft.

[0061] One end of the adapter plate 6 is connected to the process screw hole on the outer oil seal assembly using a fastening bolt 7, and the other end is detachably connected to the thrust device 4. The pad 5 is also detachably connected to the adapter plate 6 via a connector. When installing the outer oil seal 14, the other end of the adapter plate 6 is not connected to the thrust device 4. The outer oil seal 14, adapter plate 6, pad 5, and thrust device 4 are sequentially mounted on the pull rod 2, and the pad 5 is connected to the adapter plate 6. The push rod of the thrust device 4 pushes the pad 5 to move towards the shaft, thus installing the outer oil seal 14 onto the shaft. When removing the outer oil seal 14, the other end of the adapter plate 6 is connected to the thrust device 4. The pad 5, adapter plate 6, and thrust device 4 are sequentially mounted on the pull rod. The push rod of the thrust device 4 passes through the adapter plate 6, and the thrust acts on one end of the pad 5. The other end of the pad 5 contacts the end of the shaft, and the resulting reaction force is transmitted to the outer oil seal 14 through the adapter plate 6, thus pulling the outer oil seal 14 out.

[0062] The detachable connection between pad 5 and adapter plate 6 via a connector means that one end of pad 5 has an external thread, and one end of adapter plate 6 has an internal thread that matches the external thread, allowing adapter plate 6 and pad 5 to be connected by threads. Figure 5 As shown, the pad 5 is T-shaped, and the end of the T-shaped pad 5 with a smaller outer diameter has an external thread 52. One end of the adapter plate 6 has an internal thread hole 63 that matches the external thread 52, so that the adapter plate 6 and the pad 5 can be connected by threads.

[0063] The other end of the adapter plate 6 is detachably connected to the thrust device 4, which means that the thrust device 4 has an external thread that matches the internal thread of the adapter plate 6, so that the adapter plate 6 and the thrust device 4 can be connected by the thread.

[0064] like Figure 7As shown, the adapter plate 6 has a countersunk hole at one end near the outer oil seal 14. The diameter of the countersunk hole is larger than the outer diameter of the pad 5, so that the pad 5 can be partially or completely accommodated in the countersunk hole. The outer diameter of the pad 5 is less than or equal to the outer diameter of the rotating shaft, so that the push rod of the thrust device 4 can pass through the adapter plate 6 to apply a thrust to the pad 5 accommodated in the countersunk hole. The resulting reaction force is transmitted to the outer oil seal 14 through the adapter plate 6, which can pull the outer oil seal 14 out.

[0065] The thrust device 4 has an external thread that matches the internal thread hole 63 of the adapter plate 6, so that the adapter plate 6 and the thrust device 4 can be connected by threads.

[0066] like Figure 7 As shown, the countersunk hole includes a countersunk platform 61, which is located on the end face of the countersunk hole facing the outer oil seal 14. The diameter of the countersunk platform 61 is larger than the outer diameter of the shaft to avoid interference with the shaft when installing the outer oil seal 14.

[0067] The remaining part of the countersunk hole is countersunk platform 2 62, which communicates with countersunk platform 1 61. The length of the pad 5 is less than or equal to the sum of the depths of countersunk platform 1 61, countersunk platform 2 62 and the countersunk platform 16 at the end of the shaft.

[0068] The thrust device 4 is a jack. The fact that the end of the thrust device 4 that pushes the intermediate component has an external thread means that the outer shell of the jack has an external thread. The push rod of the thrust device 4 refers to the push rod of the jack.

[0069] This application optimizes the structure of the intermediate component that bears the thrust between the jack and the outer oil seal 14, enabling the installation and removal of the motor's outer oil seal 14 using a single device. The components bearing the thrust are the pad 5 and the adapter plate 6. The pad 5 bears the thrust of the jack, and the adapter plate 6 transmits the thrust and is threadedly connected to the outer oil seal 14. The thrust of the jack is transmitted from the pad 5 to the adapter plate 6. The ingenuity of this application lies in the fact that, whether installing or removing the outer oil seal 14, the jack always pushes the pad 5, and the adapter plate 6 is always connected to the outer oil seal 14, even though the installation and removal directions of the outer oil seal 14 are opposite. First, the pad 5 and the adapter plate 6 bear the thrust to press the outer oil seal 14 into the shaft. The jack's push rod contacts the pad 5, one end of the adapter plate 6 is connected to the pad 5, and the other end is connected to the process screw hole on the outer oil seal 14. The thrust of the jack presses the outer oil seal 14 into the shaft. When installing the outer oil seal 14, the adapter plate 6 pushes the outer oil seal 14 into the rotating shaft. When removing the outer oil seal 14, the adapter plate 6 needs to provide a pulling force to pull the outer oil seal 14 out of the rotating shaft. Therefore, in this application, the other end of the adapter plate 6 can also be connected to a jack. A countersunk hole is opened in the center of the adapter plate 6 to accommodate the pad 5. One end of the pad 5 bears the thrust of the jack, and the other end contacts the rotating shaft. When the jack pushes the pad 5, the resulting reaction force is transmitted to the outer oil seal 14 through the adapter plate 6, pulling the outer oil seal 14 out. Preferably, the pad 5 is T-shaped. When installing the oil seal, the end of the T-shaped pad 5 with the smaller outer diameter has an external thread, which is threaded to the adapter plate 6 facing the rotating shaft. When removing the outer oil seal 14, the T-shaped pad 5 is turned around, with the end with the larger outer diameter facing the rotating shaft.

[0070] The specific implementation method for installing the outer oil seal 14 is as follows:

[0071] (1) Screw the end of the pad 5 with the external thread into the internal thread hole 63 of the adapter plate 6 until the threaded end faces of the two are in contact;

[0072] (2) Align the mounting hole 64 of the adapter plate 6 with the process screw hole on the end face of the outer oil seal 14, and fix the fastening bolt 7 through the mounting hole 64 of the adapter plate 6 into the process screw hole on the end face of the outer oil seal 14, so that the pad 5, the adapter plate 6, and the outer oil seal 14 form a whole, which is called the outer oil seal assembly;

[0073] (3) Install the tie rod 2 in the center screw hole 15 of the rotating shaft;

[0074] (4) Install the outer oil seal assembly onto the tie rod 2, with the pad 5 facing outwards;

[0075] (5) Install the hollow jack and nut 3 on the pull rod 2 in sequence;

[0076] (6) Apply lifting force with a hollow jack to push the outer oil seal assembly toward the shaft until the lifting display pressure suddenly rises. At the same time, observe that the end face of the outer oil seal 14 is flush with the end face of the shaft, which means that the outer oil seal 14 is installed in place.

[0077] The specific implementation method for removing the outer oil seal 14 is as follows:

[0078] (1) Install the tie rod 2 in the center screw hole 15 of the rotating shaft;

[0079] (2) Mount the pad 5 onto the tie rod 2, wherein the threaded end of the pad 5 faces outward and the inner end face is in contact with the rotating shaft countersunk 16;

[0080] (3) Install the internal threaded hole of the adapter plate 6 onto the external thread of the hollow jack to form a whole;

[0081] (4) Mount the hollow jack onto the tie rod 2 so that the mounting hole 64 of the adapter plate 6 is aligned with the process screw hole on the end face of the outer oil seal 14. Then, pass the fastening bolt 7 through the mounting hole 64 of the adapter plate 6 and fix it in the process screw hole on the end face of the outer oil seal 14.

[0082] (5) Apply lifting force to the pad 5 by using a hollow jack. The resulting reaction force is transmitted to the outer oil seal 14 through the adapter plate 6, which can pull the outer oil seal 14 out.

[0083] Compared with the prior art, the advantages of this invention are that the outer oil seal 14 is installed by cold pressing, which eliminates the need for heating and reduces energy consumption. Furthermore, the same set of equipment is used when removing the outer oil seal 14, saving on tooling manufacturing costs. The entire outer oil seal 14 installation device is ingeniously designed, has a simplified structure, low manufacturing cost, and is easy to install, improving work efficiency. It is applicable to the installation and removal of outer oil seals 14 with similar structures.

[0084] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims

1. An auxiliary device for installing and removing an external oil seal of a motor, characterized in that, The assembly includes a pull rod, a thrust device sleeved on the pull rod, and an intermediate component. One end of the pull rod is placed in the central threaded hole at the end of the rotating shaft, and the other end is equipped with a stop block. The thrust device is located on the side of the stop block closer to the rotating shaft. One end of the intermediate component is connected to the process threaded hole on the outer oil seal using fasteners. The stop block limits the thrust device, and the push rod of the thrust device pushes the other end of the intermediate component to install the outer oil seal onto the rotating shaft. The intermediate component includes a pad and an adapter plate. One end of the pad is connected to the adapter plate via a connector. The connection between one end of the intermediate component and the process threaded hole on the outer oil seal using fasteners means that the adapter plate is connected to the process threaded hole on the outer oil seal using fasteners. The pad bears the thrust of the thrust device and then transmits the thrust to the adapter plate to press the outer oil seal into the rotating shaft. One end of the adapter plate is connected to the process screw hole on the outer oil seal assembly using fasteners, and the other end is detachably connected to the thrust device. The pad and the adapter plate are also detachably connected via connectors. When installing the outer oil seal, the other end of the adapter plate is not connected to the thrust device. The outer oil seal, adapter plate, pad, and thrust device are sequentially fitted onto the pull rod, and the pad is connected to the adapter plate. The push rod of the thrust device pushes the pad to move towards the shaft, installing the outer oil seal onto the shaft. When removing the outer oil seal, the other end of the adapter plate is connected to the thrust device. The pad, adapter plate, and thrust device are sequentially fitted onto the pull rod. The push rod of the thrust device passes through the adapter plate, and the thrust is applied to one end of the pad. The other end of the pad contacts the end of the shaft. The adapter plate has a countersunk hole at one end near the outer oil seal. The diameter of the countersunk hole is larger than the outer diameter of the pad, so that the pad can be partially or completely accommodated in the countersunk hole. The outer diameter of the pad is less than or equal to the outer diameter of the shaft, so that the push rod of the thrust device can pass through the adapter plate to apply a thrust to the pad accommodated in the countersunk hole. The resulting reaction force is transmitted to the outer oil seal through the adapter plate, which can pull the outer oil seal out.

2. The auxiliary device for installing and removing the external oil seal of the motor according to claim 1, characterized in that, The detachable connection between the pad and the adapter plate via a connector means that one end of the pad has an external thread, and one end of the adapter plate has an internal thread that matches the external thread, so that the adapter plate and the pad can be connected by threads.

3. The auxiliary device for installing and removing the external oil seal of the motor according to claim 1, characterized in that, The other end of the adapter plate is detachably connected to the thrust device, which means that the thrust device has external threads that are compatible with the internal threads of the adapter plate, so that the adapter plate and the thrust device can be connected by threads.

4. The auxiliary device for installing and removing the external oil seal of the motor according to claim 1, characterized in that, The countersunk hole includes a countersunk platform, which is located on the end face of the countersunk hole facing the outer oil seal. The diameter of the countersunk platform is larger than the outer diameter of the shaft to avoid interference with the shaft when installing the outer oil seal.

5. The auxiliary device for installing and removing the external oil seal of the motor according to claim 4, characterized in that, The remaining part of the countersunk hole is countersunk platform two, which communicates with countersunk platform one. The length of the pad is less than or equal to the sum of the depths of countersunk platform one, countersunk platform two, and the countersunk platform at the end of the shaft.

6. The auxiliary device for installing and removing the external oil seal of the motor according to claim 3, characterized in that, The thrust device is a jack. The fact that one end of the thrust device pushes the intermediate component has an external thread means that the outer shell of the jack has an external thread. The thrust device push rod refers to the jack push rod.

7. A method for installing and removing an external oil seal for a motor, characterized in that, The steps for using the auxiliary device for installing and removing the external oil seal of the motor according to any one of claims 1 to 6 are as follows: (1) Connect the pad to the adapter plate; (2) Use fasteners to connect the adapter plate to the process screw holes on the end face of the outer oil seal, so that the pad, adapter plate and outer oil seal form a whole, which is called the outer oil seal assembly; (3) Install the tie rod in the center screw hole of the shaft; (4) Install the outer oil seal assembly onto the tie rod, with the pad facing outwards; (5) Then install the thrust device and the stop block on the tie rod in sequence; (6) Apply lifting force through the thrust device to push the outer oil seal assembly toward the shaft until the lifting display pressure suddenly rises. At the same time, observe that the outer oil seal end face is flush with the shaft end face, which indicates that the outer oil seal is installed in place. (7) Remove the stop block, thrust device, and pad from the pull rod; loosen the fasteners connecting the mounting hole of the adapter plate and the process screw hole on the outer oil seal end face, and remove the adapter plate from the pull rod; unscrew the pull rod out of the center screw hole of the shaft; (8) When removing the outer oil seal, install the pull rod in the center screw hole of the shaft; (9) Fit the pad onto the tie rod, wherein the end face of one end of the pad is in contact with the countersunk of the rotating shaft; (10) Fit the adapter plate onto the tie rod and connect the adapter plate to the thrust device; (11) Mount the thrust device onto the tie rod so that the mounting hole of the adapter plate is aligned with the process screw hole on the outer oil seal end face, and then fix the fastener through the mounting hole of the adapter plate into the process screw hole on the outer oil seal end face. (12) Apply a lifting force to the pad by the thrust device, and the resulting reaction force is transmitted to the outer oil seal through the adapter plate, which can pull the outer oil seal out.

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