Screw sleeve press-fitting device, screw sleeve and press-fitting method for rail vehicle gearbox housing

Abstract

The present invention relates to the technical field of screw sleeve press-fitting of rail vehicle gearbox, and specifically discloses a screw sleeve press-fitting device, a screw sleeve and a press-fitting method for a rail vehicle gearbox housing. The screw sleeve press-fitting device comprises a core shaft for threaded connection with a locking sealing screw sleeve and a shell for crushing the locking sealing screw sleeve, the core shaft passes through the shell from top to bottom; the outer peripheral surface of the lower part of the core shaft is provided with an external thread, which is adapted to the internal thread of the locking sealing screw sleeve. A compression zone is provided above the threaded zone of the locking sealing screw sleeve, the inner and outer surfaces of the compression zone are both smooth, a locking toothed disc is provided above the compression zone, and a flat flange is provided above the locking toothed disc. Since the aluminum alloy housing and the steel screw sleeve have different thermal expansion coefficients, the thermal deformation is different, which leads to a gap between the aluminum alloy threaded hole and the steel screw sleeve. The screw sleeve press-fitting device, the screw sleeve and the press-fitting method of the present invention can effectively compensate for the generation of the gap, thereby achieving a good sealing effect.

Description

Technical Field

[0001] The invention relates to the technical field of screw sleeve press-fitting of a rail vehicle gear box, and in particular to a screw sleeve press-fitting device, a screw sleeve and a press-fitting method for a rail vehicle gear box body. Background Art

[0002] When aluminum alloy structural parts are connected with steel bolts, the bolts are subjected to large preload and impact loads. Due to the inherent characteristics of aluminum alloy materials, its threads cannot provide sufficient bending stiffness and shear strength, making it difficult to achieve the reliability and self-locking function of threaded connection. For aluminum alloy gearbox housings of rail vehicles, it is necessary to ensure the overall heat dissipation effect of the gearbox and to ensure that each internal rotating part is fully lubricated. Therefore, the gearbox housing usually needs to adopt a complex casting structure. If the threads are machined on the housing and the bolts are directly connected, once the threads are damaged, the housing will be scrapped as a whole, making the manufacturing cost of the gearbox difficult to control.

[0003] For the above reasons, inserting steel screw sleeves into the bolt holes of aluminum alloy housings is one of the effective solutions and is also a method commonly used in the rail vehicle industry. However, the housing and the screw sleeves must have sufficient sealing performance and preload to achieve the desired anti-loosening effect, and must also ensure easy installation and strong applicability.

[0004] CN106895057A discloses a rivet screw sleeve specially used for aluminum profiles, which is mainly composed of a main body, a base is arranged at the rear end of the main body, an annular boss is arranged on the outer wall of the main body in front of the base, a boss is arranged at the front end of the main body, a hole is opened in the front part of the main body, a thread is arranged on the inner wall of the hole, and an expansion locking hole that penetrates the hole is opened at the rear part of the main body.

[0005] CN218693566U discloses a threaded sleeve rivet structure, comprising: a moving block, a pushing rod, a pushing plate, a pushing frame and a positioning rod. Its technical feature is that a movable straight rod is provided, and the force is transmitted by the first movable straight rod and the second movable straight rod. The principle of the lever is adopted to expand the pulling force in the same direction, thereby increasing the pulling force of the driving device on the rivet rod, improving the transmission efficiency of the rivet structure, and reducing the power demand for the driving device.

[0006] CN112833079A discloses a locking screw sleeve, which utilizes an axial elastic reset mechanism and a circumferential limit mechanism arranged on the matching surfaces of the outer screw sleeve and the inner screw sleeve, as well as a screw-in structure arranged on the inner screw sleeve, so that the operator can perform blind insertion operations more conveniently and reliably while ensuring that the tightening torque is appropriate.

[0007] The above technical solution is mainly realized through the self-locking function of the screw sleeve, and the self-locking effect is mostly achieved by inserting a pin into the outer thread slot of the screw sleeve; and the structure is relatively complex and the cost is high. This type of screw sleeve has a very limited effect on aluminum structural parts, and the installation is complicated. At the same time, in the application scenarios of aluminum structural parts at high speed or with vibration, the impact of vibration will lead to poor self-locking effect; and because the screw sleeve is used in the combination of steel and aluminum-based materials, the expansion coefficients of the two metal materials are different, which will cause gaps between the aluminum base material and the steel screw sleeve, and cannot achieve a good sealing effect. In addition, the function of some threaded holes is to observe and maintain structural parts. They are used frequently and are often disassembled. If the self-locking effect of the screw sleeve is poor, it will greatly affect the service life of the aluminum structural parts.

[0008] Therefore, how to achieve sufficient sealing performance and preload between the aluminum alloy gearbox housing and the screw sleeve of a rail vehicle through a simpler structural design has become one of the technical problems that need to be urgently solved in this field. Summary of the invention

[0009] Aiming at the problem that ordinary screw sleeves in the aluminum alloy gearbox housing of rail vehicles are not sufficiently sealed and are easy to fall off due to frequent disassembly, the first object of the present invention is to provide a screw sleeve press-fitting device for the gearbox housing of a rail vehicle.

[0010] The second object of the present invention is to provide a screw sleeve that matches the above-mentioned screw sleeve press-fitting device.

[0011] The third object of the present invention is to provide a method for pressing a screw sleeve of a rail vehicle gear box body.

[0012] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0013] A screw sleeve pressing device for a rail vehicle gearbox housing, comprising a core shaft for threaded connection with a locking and sealing screw sleeve and a shell for compressing the locking and sealing screw sleeve, wherein the core shaft passes through the shell from top to bottom; when subjected to pressure, the shell and the core shaft can slide relative to each other;

[0014] The outer peripheral surface of the lower part of the core shaft is provided with an external thread, which is matched with the internal thread of the locking and sealing screw sleeve; the screw sleeve pressing device is used for pressing the locking and sealing screw sleeve on the aluminum alloy gearbox housing of the rail vehicle.

[0015] Furthermore, a cavity is formed between the inner wall surface of the upper part of the shell and the core shaft, and a core shaft pressure ring formed integrally with the core shaft is provided on the outer peripheral surface of the middle and upper part of the core shaft, and the core shaft pressure ring divides the cavity into an upper cavity of the upper pressure zone and a lower hydraulic oil chamber;

[0016] A spring is installed in the upper cavity of the pressure zone, the upper end of the spring abuts against the inner surface of the top end of the shell, and the lower end of the spring abuts against the upper surface of the core shaft pressure ring; the core shaft pressure ring and the inner wall surface of the shell are clearance-matched; the outer wall of the core shaft below the core shaft pressure ring is coaxially clearance-matched with the shell.

[0017] Furthermore, the hydraulic oil chamber is filled with hydraulic oil. When the hydraulic oil is squeezed, the hydraulic oil will push the housing and the core shaft downward to slide against each other; when the pressure is released, the spring will push the housing upward to return to its original position.

[0018] Furthermore, the screw sleeve pressing device also includes a handle, which is hinged to the front end of the pressing handle, and the interface located at the front end of the handle is connected to the hydraulic oil chamber; the interior of the middle and rear part of the handle is an oil storage chamber, and the interior of the front part of the handle is provided with an oil outlet pipeline and an oil return pipeline, and the oil storage chamber is connected to the hydraulic oil chamber through the oil outlet pipeline and the oil return pipeline.

[0019] Furthermore, a connecting rod is provided at the lower front part of the pressure handle, and a piston chamber is provided inside the front part of the handle. The lower end of the connecting rod is connected to the upper surface of the piston located in the piston chamber, and the lower part of the piston chamber is connected to the middle part of the oil inlet pipeline. A one-way valve is provided on the oil inlet pipeline between the oil storage chamber and the piston chamber and on the oil inlet pipeline between the piston chamber and the hydraulic oil chamber, and a reflux valve is provided on the oil return pipeline; the oil storage chamber and the piston chamber below the piston are filled with hydraulic oil.

[0020] Furthermore, a spindle handle is provided at the top of the spindle; a sealing ring is provided on the contact surface between the spindle outer wall of the spindle and the shell, and a sealing ring is provided on the contact surface between the top of the shell and the spindle. An oil outlet hole is provided at the front end of the oil outlet pipeline, and an oil return hole is provided at the front end of the oil return pipeline. The oil outlet hole and the oil return hole are located in the interface.

[0021] A locking sealing screw sleeve adapted to the screw sleeve press-fitting device of the present invention, wherein a compression zone is provided above the threaded zone of the locking sealing screw sleeve, the inner and outer surfaces of the compression zone are both smooth, a locking toothed disc is provided above the compression zone, and a plane flange is provided above the locking toothed disc. The outer diameter of the plane flange is greater than the maximum outer diameter of the locking toothed disc, and the maximum outer diameter of the locking toothed disc is greater than the outer diameter of the compression zone; a sealing ring is sleeved on the outer wall surface of the compression zone; the outer wall surface of the threaded zone is an external thread, and the inner wall surface is an internal thread.

[0022] The screw sleeve press-fitting device and the locking and sealing screw sleeve press-fitting method of the present invention are specifically as follows: the locking and sealing screw sleeve is connected to the pre-processed threaded hole on the aluminum alloy gear box body of the rail vehicle, the mandrel is connected to the locking and sealing screw sleeve, and the mandrel handle is used to pre-tighten it, the reflux valve is closed, and then the pressure handle is pressed, the mandrel pressure ring is compressed to generate an upward force, which drives the locking and sealing screw sleeve and the lower bottom surface of the shell of the screw sleeve press-fitting device to generate extrusion, so that the external thread of the locking and sealing screw sleeve is forced to fit more closely with the internal thread of the aluminum alloy gear box body of the rail vehicle;

[0023] At the same time, the outer shell of the screw sleeve pressing device presses the flat flange downward, so that the locking toothed disc is embedded in the housing. When the bolts are subsequently installed in the locking sealing screw sleeve, the locking toothed disc will resist the rotation torque of the bolts, ensuring that the locking sealing screw sleeve and the housing are always in a locked state and the threaded connection is not loose; the compression area under the locking toothed disc is squeezed and deformed during the downward pressing process, and the compressed and deformed sealing ring fills the gap between the locking sealing screw sleeve and the housing, ensuring the sealing effect of the aluminum alloy gearbox;

[0024] Finally, use a vernier caliper to check the height between the screw sleeve flat flange and the mounting surface; if qualified, mark the anti-loosening line.

[0025] Compared with the prior art, the outstanding effects of the present invention are:

[0026] (1) Aiming at the aluminum alloy gearbox housing of rail vehicles, the present invention innovatively designs a screw sleeve press-fitting device, a screw sleeve and a press-fitting method, which completely overcomes the problem of poor thread self-locking effect caused by the combined effects of bolt preload and vibration impact.

[0027] (2) Since the aluminum alloy housing and the steel screw sleeve have different thermal expansion coefficients and different thermal deformations, a gap is generated between the aluminum alloy threaded hole and the steel screw sleeve. The screw sleeve pressing device, screw sleeve and pressing method of the present invention can effectively compensate for the gap, thereby achieving a good sealing effect.

[0028] (3) Since the gearbox requires regular inspection and maintenance, the bolts need to be frequently disassembled and tightened, which seriously affects the service life of the aluminum structural parts. The threaded sleeve pressing device, threaded sleeve and pressing method of the present invention can effectively reduce the damage to the threads of the threaded holes of the aluminum alloy box body and ensure the preload force and sealing effect of the threads.

[0029] (4) The threaded sleeve pressing device and threaded sleeve of the present invention can be used with threaded holes of different apertures. Once pressed into place, they can be locked, and the locking time is stable and reliable, thereby adapting to the bolt connection and aluminum box sealing requirements of different needs, and also meeting the user's requirements for sealing performance and connection stability.

[0030] (5) The present invention has an ingenious structure, low cost, small space occupation, and can be moved anytime and anywhere. The overall weight of the screw sleeve is only 39g. It can be used not only on aluminum structural parts, but also in other occasions (such as forgings, castings and machined parts that require threaded holes), which is convenient for market promotion.

[0031] The screw sleeve press-fitting device, screw sleeve and press-fitting method of the rail vehicle gearbox housing of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a three-dimensional schematic diagram of a screw sleeve press-fitting device and a screw sleeve of a rail vehicle gearbox housing.

[0033] Figure 2 It is an exploded diagram of the screw sleeve press-fitting device and the screw sleeve of the gear box body of a railway vehicle.

[0034] Figure 3 It is a cross-sectional view of a screw sleeve press-fitting device and a screw sleeve of a rail vehicle gearbox housing.

[0035] Figure 4 This is a half-section view of the locking sealing screw sleeve (before crushing).

[0036] Figure 5 This is a half-section view of the locking sealing screw sleeve (after crushing).

[0037] Figure 6 This is a schematic diagram of the anti-loose wire.

[0038] Among them, 1-locking sealing screw sleeve, 11-flat flange, 12-locking tooth plate, 13-sealing ring, 14-compression area, 15-external thread, 16-internal thread;

[0039] 2-screw sleeve pressing device, 21-pressing handle, 22-handle, 221-rotating shaft, 222-interface, 223-connecting rod, 224-oil storage chamber, 225-check valve, 226-oil outlet hole, 227-oil return hole, 228-piston, 229-reflux valve; 23-core shaft, 231-core shaft pressure ring, 232-upper cavity of pressure zone, 233-core shaft outer wall, 25-housing, 26-spring, 27-hydraulic oil chamber, 28-core shaft handle;

[0040] 3-Aluminum alloy gearbox housing for rail vehicles, 4-Anti-loosening wire. DETAILED DESCRIPTION

[0041] like Figure 1-3As shown, a screw sleeve pressing device for a rail vehicle gear box body, the screw sleeve pressing device 2 includes a core shaft 23 for threaded connection with a locking sealing screw sleeve 1 and a shell 25 for pressing the locking sealing screw sleeve 1, the core shaft 23 passes through the shell 25 from top to bottom; the outer peripheral surface of the lower part of the core shaft 23 is provided with an external thread, which is adapted to the internal thread of the locking sealing screw sleeve 1.

[0042] A cavity is formed between the inner wall surface of the upper part of the housing 25 and the core shaft 23. A core shaft pressure ring 231 formed integrally with the core shaft 23 is provided on the outer circumference of the upper part of the core shaft 23. The core shaft pressure ring 231 divides the cavity into an upper cavity 232 of the upper pressure zone and a lower hydraulic oil cavity 27.

[0043] A spring 26 is installed in the upper cavity 232 of the pressure zone, and the upper end of the spring 26 abuts against the inner surface of the top end of the shell 25, and the lower end of the spring 26 abuts against the upper surface of the core shaft pressure ring 231; the core shaft pressure ring 231 is clearance-matched with the inner wall surface of the shell 25; the core shaft outer wall 233 below the core shaft pressure ring 231 is coaxially clearance-matched with the shell 25.

[0044] The hydraulic oil chamber 27 is filled with hydraulic oil. When the hydraulic oil is squeezed, the hydraulic oil will push the housing 25 and the core shaft 23 downward to slide against each other. When the pressure is released, the spring 26 will push the housing 25 upward to return to its original position, squeezing the hydraulic oil out and returning the oil.

[0045] It also includes a handle 22, which is hinged to the front end of the pressure handle 21, and an interface 222 located at the front end of the handle 22 is connected to the hydraulic oil chamber 27. The interface 222 of the handle 22 is interference-fitted with the housing 25 and is tightly connected. The interior of the middle and rear part of the handle 22 is an oil storage chamber 224, and the interior of the front part of the handle 22 is provided with an oil outlet pipeline and an oil return pipeline, and the oil storage chamber 224 is connected to the hydraulic oil chamber 27 through the oil outlet pipeline and the oil return pipeline.

[0046] A connecting rod 223 is provided at the lower front part of the pressure handle 21, a piston cavity is provided inside the front part of the grip 22, the lower end of the connecting rod 223 is connected to the upper surface of the piston 228 located in the piston cavity, the lower part of the piston cavity is connected to the middle part of the oil inlet pipeline, a one-way valve 225 is provided on the oil inlet pipeline between the oil storage cavity 224 and the piston cavity, and on the oil inlet pipeline between the piston cavity and the hydraulic oil cavity 27, and a return valve 229 is provided on the oil return pipeline; the oil storage cavity 224 and the piston cavity below the piston 228 are filled with hydraulic oil. An oil outlet hole 226 is provided at the front end of the oil outlet pipeline, and an oil return hole 227 is provided at the front end of the oil return pipeline, and the oil outlet hole 226 and the oil return hole 227 are located in the interface 222.

[0047] A core shaft handle 28 is provided at the top of the core shaft 23; a sealing ring is provided on the contact surface between the core shaft outer wall 233 of the core shaft 23 and the shell 25, and a sealing ring is provided on the contact surface between the top of the shell 25 and the core shaft 23 to ensure the sealing effect.

[0048] like Figure 4-5 As shown, a locking sealing screw sleeve adapted to the above-mentioned screw sleeve press-fitting device has the following specific structure:

[0049] A compression zone 14 is provided above the threaded zone of the locking sealing screw sleeve 1, and both the inner and outer surfaces of the compression zone 14 are smooth. A locking toothed disc 12 is provided above the compression zone 14, and a plane flange 11 is provided above the locking toothed disc 12. The outer diameter of the plane flange 11 is greater than the maximum outer diameter of the locking toothed disc 12, and the maximum outer diameter of the locking toothed disc 12 is greater than the outer diameter of the compression zone 14; a sealing ring 13 is sleeved on the outer wall surface of the compression zone 14; the outer wall surface of the threaded zone is an outer thread 15, and the inner wall surface is an inner thread 16.

[0050] like Figure 4-6 As shown, the above-mentioned screw sleeve press-fitting device and the above-mentioned locking and sealing screw sleeve press-fitting method are used, specifically: pre-determine whether the bottom hole of the locking and sealing screw sleeve 1 is pre-threaded, then use a level to check whether the installation bottom hole is parallel to the ground, use an air gun to thoroughly clean the screw sleeve installation hole before installing the locking and sealing screw sleeve 1, and then use cutting stock to lubricate the external thread 15 of the locking and sealing screw sleeve 1;

[0051] Manually connect the locking and sealing screw sleeve 1 to the pre-machined threaded hole on the aluminum alloy gearbox housing 3 of the rail vehicle, then screw the mandrel 23 onto the locking and sealing screw sleeve 1, and pre-tighten it with the mandrel handle 28, close the reflux valve 229, and then press the pressure handle 21, the mandrel pressure ring 231 is compressed to generate an upward force, which drives the locking and sealing screw sleeve 1 and the lower bottom surface of the housing 25 of the screw sleeve press-fitting device 2 to generate extrusion, so that the external thread 15 of the locking and sealing screw sleeve 1 is forced to fit more closely with the internal thread of the aluminum alloy gearbox housing 3 of the rail vehicle;

[0052] At the same time, the outer shell 25 of the screw sleeve pressing device 2 presses the flat flange 11 downward, so that the locking toothed disc 12 is embedded in the housing. When the bolts are subsequently installed in the locking sealing screw sleeve 1, the locking toothed disc 12 will resist the rotation torque of the bolts, ensuring that the locking sealing screw sleeve 1 and the housing are always in a locked state and the threaded connection is not loose; the compression area 14 below the locking toothed disc 12 is squeezed and deformed during the downward pressing process, and fills the gap between the locking sealing screw sleeve 1 and the housing with the deformed sealing ring 13, ensuring the sealing effect of the aluminum alloy gearbox;

[0053] Open the reflux valve 229 and remove the screw sleeve pressing device 2;

[0054] Finally, use a vernier caliper to check whether the height between the flat flange 11 of the screw sleeve and the mounting surface is between 1.2 and 1.3 mm; if qualified, mark the anti-loosening line 4 with a green marker.

[0055] During the actual installation process, a force of about 60KN is required to press the screw sleeve in.

[0056] The screw sleeve press-fitting device and locking sealing screw sleeve of the present invention overcome the problem of poor self-locking effect of the thread caused by the combined effect of the bolt preload and vibration impact; effectively compensate for the generation of gaps, thereby achieving a good sealing effect; effectively reduce the thread damage of the threaded hole of the aluminum alloy box, and ensure the preload force and sealing effect of the thread.

[0057] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A screw sleeve press-fitting device for a rail vehicle gearbox housing, characterized in that: The screw sleeve pressing device (2) comprises a core shaft (23) for being threadedly connected to a locking and sealing screw sleeve (1) and a shell (25) for compressing the locking and sealing screw sleeve (1), wherein the core shaft (23) passes through the shell (25) from top to bottom; the outer peripheral surface of the lower part of the core shaft (23) is provided with an external thread, which is matched with the internal thread of the locking and sealing screw sleeve (1); a cavity is formed between the inner wall surface of the upper part of the shell (25) and the core shaft (23); a core shaft pressure ring (231) formed integrally with the core shaft (23) is provided on the outer peripheral surface of the middle and upper part of the core shaft (23), and the core shaft pressure ring (231) divides the cavity into an upper cavity (232) of the upper pressure zone and a lower hydraulic oil cavity (27); a sealing ring is provided on the contact surface between the core shaft outer wall (233) of the core shaft (23) and the shell (25); When the housing (25) is subjected to pressure, the housing (25) and the core shaft (23) may slide relative to each other; The screw sleeve press-fitting device (2) is used for press-fitting a locking and sealing screw sleeve (1) on a rail vehicle aluminum alloy gearbox housing.

2. The screw sleeve press-fitting device for a rail vehicle gearbox housing according to claim 1, characterized in that: A spring (26) is installed in the upper cavity (232) of the pressure zone, the upper end of the spring (26) abuts against the inner surface of the top end of the shell (25), and the lower end of the spring (26) abuts against the upper surface of the core shaft pressure ring (231); the core shaft pressure ring (231) and the inner wall surface of the shell (25) are clearance-matched; the core shaft outer wall (233) below the core shaft pressure ring (231) and the shell (25) are coaxially clearance-matched; The hydraulic oil chamber (27) is filled with hydraulic oil. When the hydraulic oil is squeezed, the hydraulic oil will push the housing (25) and the core shaft (23) downward to slide against each other. When the pressure is released, the spring (26) will push the housing (25) to return upward.

3. The screw sleeve press-fitting device for a rail vehicle gearbox housing according to claim 2, characterized in that: It also includes a handle (22), which is hinged to the front end of the pressure handle (21), and an interface (222) located at the front end of the handle (22) is connected to the hydraulic oil chamber (27).

4. The screw sleeve press-fitting device for a rail vehicle gearbox housing according to claim 3, characterized in that: The interior of the middle and rear part of the handle (22) is an oil storage chamber (224), and the interior of the front part of the handle (22) is provided with an oil outlet pipeline and an oil return pipeline. The oil storage chamber (224) is connected to the hydraulic oil chamber (27) through the oil outlet pipeline and the oil return pipeline.

5. The screw sleeve press-fitting device for a rail vehicle gearbox housing according to claim 4, characterized in that: A connecting rod (223) is provided below the front of the pressure handle (21), and a piston chamber is provided inside the front of the grip (22). The lower end of the connecting rod (223) is connected to the upper surface of the piston (228) located in the piston chamber, and the lower part of the piston chamber is connected to the middle part of the oil inlet pipeline. A one-way valve (225) is provided on the oil inlet pipeline between the oil storage chamber (224) and the piston chamber, and on the oil inlet pipeline between the piston chamber and the hydraulic oil chamber (27), and a return valve (229) is provided on the oil return pipeline; the oil storage chamber (224) and the piston chamber below the piston (228) are filled with hydraulic oil.

6. The screw sleeve press-fitting device for a rail vehicle gearbox housing according to claim 5, characterized in that: A spindle handle (28) is provided at the top of the spindle (23); and a sealing ring is provided on the contact surface between the top of the housing (25) and the spindle (23).

7. The screw sleeve press-fitting device for a rail vehicle gearbox housing according to claim 6, characterized in that: The front end of the oil outlet pipeline is provided with an oil outlet hole (226), the front end of the oil return pipeline is provided with an oil return hole (227), and the oil outlet hole (226) and the oil return hole (227) are located in the interface (222).

8. A press-fitting method using the screw sleeve press-fitting device according to any one of claims 1 to 7, characterized in that: The screw sleeve pressing device also includes a handle, which is hinged to the front end of the pressing handle, and the interface located at the front end of the handle is connected to the hydraulic oil chamber; the interior of the middle and rear part of the handle is an oil storage chamber, and the interior of the front part of the handle is provided with an oil outlet pipeline and an oil return pipeline, and the oil storage chamber is connected to the hydraulic oil chamber through the oil outlet pipeline and the oil return pipeline; a reflux valve is provided on the oil return pipeline; the top of the mandrel is provided with a mandrel handle; During press-fitting, the locking sealing screw sleeve is connected to the pre-processed threaded hole on the aluminum alloy gearbox housing of the rail vehicle, the mandrel is connected to the locking sealing screw sleeve, and the mandrel handle is used to pre-tighten the screw sleeve, and the reflux valve is closed; wherein, a compression zone is provided above the threaded zone of the locking sealing screw sleeve, the inner and outer surfaces of the compression zone are both smooth, a locking toothed disc is provided above the compression zone, and a flat flange is provided above the locking toothed disc; Then press the pressure handle and use the hydraulic pressure to press the flat flange of the outer shell of the screw sleeve pressing device downward, so that the locking toothed disc is embedded in the housing; the compression area below the locking toothed disc is squeezed and deformed during the downward pressing process, and the gap between the locking sealing screw sleeve and the housing is filled with the compressed and deformed sealing ring to ensure the sealing effect of the aluminum alloy gearbox; finally, use a vernier caliper to check the height between the flat flange of the screw sleeve and the installation surface; if qualified, mark the anti-loosening line.

9. The press-fitting method according to claim 8, characterized in that: The outer diameter of the plane flange is larger than the maximum outer diameter of the locking toothed disc, and the maximum outer diameter of the locking toothed disc is larger than the outer diameter of the compression zone; a sealing ring is sleeved on the outer wall surface of the compression zone; the outer wall surface of the threaded zone is an external thread, and the inner wall surface is an internal thread.

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