Sleeve for automobile rear axle, rear axle assembly and using method

Abstract

The invention discloses a casing pipe for an automobile rear axle, a rear axle assembly and a using method, and relates to the technical field of automobile accessories, the casing pipe comprises a pipe body, the pipe body comprises a welding section, a connecting section and a threaded section which are connected in sequence, and the welding section and the connecting section are detachably connected through a mounting mechanism; an oil injection bayonet communicated with an inner cavity of the pipe body is formed in the pipe wall of one end of the connecting section, a second oil injection port is formed in the pipe wall of the other end of the connecting section, a plurality of strip-shaped oil grooves are formed in the pipe wall surface of the threaded section, an annular oil groove and an oil passing groove are formed in the pipe wall cavity of the threaded section, and the oil passing groove is communicated with the second oil injection port; lubricating oil is injected into the inner cavity of the pipe body through the oil injection clamping opening, the surface of the threaded section is lubricated through cooperation of the second oil injection opening, the oil passing groove, the annular oil groove and the like, and the welding section and the connecting section are connected through the detachable mounting mechanism. The problems that lubricating oil is difficult to inject into an inner cavity of a pipe body and the surface of a threaded section during daily maintenance of the casing pipe for the automobile rear axle, and the casing pipe is inconvenient to replace after being damaged are solved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile accessories, and in particular to a sleeve for an automobile rear axle, a rear axle assembly and a use method thereof. Background Art

[0002] The half-axle bushing is an important part of the automobile drive axle assembly. It is integrated with the drive axle housing to fix the axial relative position of the left and right drive wheels, and together supports the frame and the mass of each assembly on it. At the same time, it bears the road reaction force and torque transmitted from the wheels when the car is running, and transmits it to the frame through the suspension. In order to ensure the performance and driving safety of the car, the rear axle bushing of the car needs regular maintenance, and lubrication is essential. High-quality rear axle lubricant can effectively reduce the friction and wear of parts, reduce the noise generated in the rear axle bushing cavity and between the connection end and other automobile parts, and can also effectively dissipate heat.

[0003] The existing rear axle sleeve for automobiles is usually welded to the drive axle housing at one end, and the threaded section at the other end is connected to the wheel hub of the tire through accessories. During daily maintenance, it is difficult to directly add lubricating oil to the inside of the pipe body and the surface of the threaded section, and it is necessary to use mechanical tools or disassemble the lubrication to inject oil into the cavity. In addition, since the sleeve is welded to the rear axle housing, when the stress-bearing part of the sleeve is bent and damaged and needs to be replaced, it is necessary to heat and cut it, trim the port, and then re-weld the sleeve. The process is cumbersome, inconvenient to repair the sleeve, and inefficient. Summary of the invention

[0004] In view of one or more deficiencies in the above-mentioned prior art, the present invention provides a sleeve for a rear axle of an automobile, a rear axle assembly and a method of use. On the one hand, the surface of the rear axle and the threaded section of the sleeve in the inner cavity of the sleeve can be lubricated with oil during installation and operation; on the other hand, the welding section of the sleeve can be quickly assembled and disassembled with other parts, thereby facilitating the maintenance and repair of the internal half-axle and replacing the sleeve when the damage is irreversible.

[0005] In order to achieve the above object, the present invention adopts one or more of the following technical solutions:

[0006] In a first aspect, a sleeve for a rear axle of an automobile is provided, comprising a pipe body, wherein the pipe body comprises a welding section, a connecting section and a threaded section which are fixedly connected in sequence, and the welding section and the connecting section are detachably connected through an installation mechanism;

[0007] An oil filling socket is provided on the tube wall at one end of the connecting section close to the welding section, and the oil filling opening is connected with the inner cavity of the tube body; a second oil filling port is provided on the tube wall at one end of the connecting section close to the threaded section, a plurality of strip oil grooves are provided on the tube wall surface of the threaded section, an annular oil groove connected with the plurality of strip oil grooves is provided in the tube wall cavity of the threaded section, an oil flow groove is connected at the bottom of the annular oil groove, and the other end of the oil flow groove extends into the tube wall cavity of the connecting section and is connected with the second oil filling port.

[0008] As a further implementation method, an oil injection connecting ring is fixedly connected to the outer wall of the connecting section close to the welding section, the oil injection connecting ring is threadedly connected to a first screw, the bottom of the first screw is fixedly connected to a plug, and the plug is docked with the oil injection bayonet.

[0009] As a further implementation, the oil injection connection ring is sleeved on the outer circumferential surface of the connection section, and a threaded opening connected to the first screw is opened on the tube wall of the oil injection connection ring; the threaded opening is arranged corresponding to the position of the oil injection bayonet.

[0010] As a further implementation method, a sealing mechanism is provided at the tube wall of the connecting section and is clamped with the second oil filling port. The sealing mechanism includes an arc-shaped clamping seat, a second screw and a sealing ring. The sealing ring and the arc-shaped clamping seat are fixedly arranged on the outer wall of the connecting section. The second screw is threadedly connected to the arc-shaped clamping seat. The sealing ring is fixedly arranged on the outer rod wall of the second screw. The second screw is clamped with the arc-shaped clamping seat through the sealing ring.

[0011] As a further implementation, the ends of the first screw rod and the second screw rod are fixedly connected with twisting blocks for holding and facilitating operation.

[0012] As a further implementation, the mounting mechanism includes a mounting ring and a mounting flange respectively fixedly connected to the welding section and the connecting section, and a bolt is fixedly connected to one side of the mounting ring, and the bolt passes through the mounting flange and is fixed to a nut.

[0013] As a further implementation, a plurality of the bolts are provided, and the plurality of bolts are evenly distributed along the circumference of the end surface of the mounting ring.

[0014] As a further implementation method, a second sealing mechanism is also provided between the welding section and the connecting section, and the second sealing mechanism includes a first sealing clamp ring, a second sealing clamp ring and an annular bayonet, the distal ends of the first sealing clamp ring and the second sealing clamp ring are respectively fixedly connected to the side walls of the mounting ring and the mounting flange, and the proximal ends of the first sealing clamp ring and the second sealing clamp ring are clamped through the annular bayonet.

[0015] As a further implementation, the surfaces of the strip oil groove, the annular oil groove and the oil runner are all provided with a Teflon stainless coating.

[0016] In a second aspect, a rear axle assembly is provided, comprising a rear axle housing and a rear axle sleeve as described in any one of the above items, wherein the rear axle sleeve is sleeved on the half-axle of the rear axle housing, and the welding section of the rear axle sleeve is welded to the rear axle housing.

[0017] In a third aspect, a method for using a sleeve for a rear axle of an automobile according to any one of the above items is provided, comprising:

[0018] When the inner cavity of the casing needs to be oiled for maintenance, the first screw is rotated upward to separate the plug at the bottom of the first screw from the oil injection port, and lubricating oil is injected into the inner cavity of the casing through the oil injection port; after the injection is completed, the first screw is rotated downward to re-seal and engage the plug with the oil injection port;

[0019] When the threaded section needs to be oiled for maintenance, the second screw rod is rotated and removed to expose the second oil filling port, and lubricating oil is injected from the second oil filling port. Lubricating oil is added to the surface thread of the threaded section through the strip oil groove, the oil outlet and the annular oil groove; after completion, the second screw rod is rotated and inserted to drive the sealing ring of the rod wall to seal and clamp the second oil filling port.

[0020] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0021] 1. The present invention injects lubricating oil into the inner cavity of the tube body through the oil filling bayonet, thereby lubricating the rear axle of the automobile and effectively protecting the internal half-axle rod; the lubricating oil is added to the surface of the sleeve threaded section through the cooperation of the second oil filling port, the oil groove, the annular oil groove and the strip oil groove, so that the surface thread can be lubricated when the sleeve is installed or even when the rear axle is moving, and oil filling and maintenance can be performed without relying on mechanical tools or disassembly; at the same time, the welding section and the connecting section of the present application are connected by a mounting mechanism that is easy to disassemble, so that the sleeve can be quickly disassembled and replaced when it is damaged.

[0022] 2. In the present invention, an oil filling connection ring, a first screw, and a plug are arranged at the oil filling port to cooperate with the oil filling port. The first screw at both ends of the tube wall of the oil filling connection ring can be rotated to move the first screw downward, and then the plug at the bottom is clamped with the oil filling port to achieve sealing, which is convenient for filling lubricating oil into the cavity.

[0023] 3. In the present invention, after the oil is filled through the second oil filling port, it flows through the corresponding oil groove to the annular oil groove in the wall cavity of the threaded section, and finally flows out through a plurality of strip oil grooves, thereby filling the surface thread with lubricating oil when the threaded section is installed.

[0024] 4. The mounting structure of the present invention adopts a mounting ring and a mounting flange to be fixedly connected with the welding section and the threaded section respectively, and then the mounting ring and the mounting flange are connected by a combination of bolts and nuts, so that the pipe body can be quickly installed and disassembled.

[0025] 5. The present invention provides a sealing mechanism at the second oil filling port, and seals the connection between the second oil filling port and the oil groove through an arc-shaped holder, a second screw and a sealing ring, and can be opened by rotating the second screw for oil filling and lubrication.

[0026] 6. The present invention implements lubrication of the tube body cavity and the surface of the threaded section by filling oil, which can effectively reduce the friction between parts, increase the service life of the rear axle bushing, and ensure driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] Figure 1 A schematic diagram of a three-dimensional structure of one or more embodiments of the present invention;

[0029] Figure 2 A front view schematic diagram of one or more embodiments of the present invention;

[0030] Figure 3 A front cross-sectional view of one or more embodiments of the present invention;

[0031] Figure 4 It is a schematic diagram of the three-dimensional structure of the first sealing collar and the second sealing collar according to one or more embodiments of the present invention.

[0032] In the figure: 1. pipe body; 2. welding section; 3. connecting section; 4. threaded section; 5. oil filling connecting ring; 6. first screw; 7. oil filling bayonet; 8. plug; 9. second oil filling port; 10. strip oil groove; 11. annular oil groove; 12. oil groove; 13. mounting ring; 14. bolt; 15. mounting flange; 16. nut; 17. arc-shaped seat; 18. second screw; 19. sealing ring; 20. first sealing clamp ring; 21. second sealing clamp ring; 22. annular bayonet; 23. twisting block. DETAILED DESCRIPTION

[0033] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] Embodiment 1

[0036] In a typical embodiment of the present application, a sleeve for a rear axle of an automobile is provided, such as Figure 1-4 As shown, it comprises a pipe body 1, wherein the pipe body 1 comprises a welding section 2, a connecting section 3 and a threaded section 4 which are fixedly connected in sequence, and the welding section 2 and the connecting section 3 are detachably connected via a mounting mechanism;

[0037] An oil filling port 7 is provided on the tube wall of one end of the connecting section 3 close to the welding section 2, and the oil filling opening 7 is connected to the inner cavity of the tube body 1; a second oil filling port 9 is provided on the tube wall of one end of the connecting section 3 close to the threaded section 4, a plurality of strip oil grooves 10 are provided on the tube wall surface of the threaded section 4, an annular oil groove 11 connected to the plurality of strip oil grooves 10 is provided in the tube wall cavity of the threaded section 4, an oil flow groove 12 is connected to the bottom of the annular oil groove 11, and the other end of the oil flow groove 12 extends into the tube wall cavity of the connecting section 3 and is connected to the second oil filling port 9.

[0038] Specifically, Figure 1 , 3 As shown, the tube body 1 includes a welding section 2, a connecting section 3 and a threaded section 4, one end of the welding section 2 is fixedly connected to the connecting section 3 by means of a mounting mechanism, the other end of the connecting section 3 is fixedly connected to the threaded section 4, an oil injection connecting ring 5 is fixedly connected to the tube wall of the connecting section 3, both ends of the tube wall of the oil injection connecting ring 5 are threadedly connected to a first screw 6 through threaded openings, and oil injection bayonet holes 7 are opened at both ends of the tube wall of the connecting section 3, the first screw 6 at both ends correspond to the positions of the oil injection bayonet holes 7, and are fixedly connected with plugs 8, and the plugs 8 at both ends are engaged with the oil injection bayonet holes 7. In this embodiment, the oil injection bayonet holes 7 arranged at both ends of the tube wall of the connecting section 3 are utilized to facilitate the filling of lubricating oil into the rear axle housing in the inner cavity of the tube wall through the corresponding openings of the oil injection connecting ring 5, thereby protecting the half-axle rod. Among them, the oil injection connecting ring 5 is set, and the first screw 6 at both ends of the tube wall of the oil injection connecting ring 5 is rotated to move the first screw 6 downward, and the plug 8 at the other end is clamped and sealed with the oil injection bayonet 7 to ensure the sealing of the sleeve during normal operation and prevent the leakage of lubricating oil.

[0039] Specifically, Figure 2 , 3 As shown, the connecting section 3 is provided with a second oil filling port 9 at both ends of the tube wall near the threaded section 4, a plurality of strip oil grooves 10 are provided on the tube wall surface of the threaded section 4, and an annular oil groove 11 is provided in the tube wall cavity of the threaded section 4. The annular oil groove 11 is arranged around the axial direction of the threaded section and is connected to the plurality of strip oil grooves 10. At the same time, the tube wall cavities of the connecting section 3 and the threaded section 4 are provided with interconnected oil grooves 12. The oil groove 12 is located at one end of the threaded section 4 and is connected to the annular oil groove, and is located at one end of the connecting section 3 and is connected to the second oil filling port 9. In this embodiment, the second oil filling port 9 is provided at both ends of the tube wall at the other end of the connecting section 3. After oil is filled through the second oil filling port 9, it flows through the corresponding oil grooves 12 to the annular oil groove 11 in the tube wall cavity of the threaded section 4, and finally flows out through the plurality of strip oil grooves 10, thereby lubricating the surface thread when the threaded section 4 is installed, so that lubricating oil can be added between the threaded section and the automobile parts for maintenance without disassembly.

[0040] In order to seal the second oil filling port 9 during use, Figure 1-3 As shown, sealing mechanisms are also provided at both ends of the tube wall of the connecting section 3 to be clamped with the second oil filling port 9 to ensure the sealing of the sleeve when oil is not filled. Specifically, the sealing mechanism includes an arc-shaped clamping seat 17, a second screw rod 18 and a sealing ring 19. The two ends of the tube wall of the connecting section 3 are fixedly connected with the arc-shaped clamping seat 17. The arc-shaped clamping seats 17 at both ends are threadedly connected with the second screw rod 18 through threaded openings. The second screw rod 18 at both ends corresponds to the position of the oil groove 12. The rod wall of the second screw rod 18 is fixedly connected with the sealing ring 19. The sealing ring 19 is clamped with the arc-shaped clamping seat 17. The second screw rod 18 threadedly connected in the arc-shaped clamping seat 17 is used to move up and down by rotating the second screw rod 18. The sealing ring 19 on the side wall is clamped with the arc-shaped clamping seat 17 to seal. When in use, the second screw 18 is rotated and taken out to facilitate oil filling.

[0041] In addition, in order to facilitate the rapid installation and removal of the casing, such as Figure 1-3 As shown, the mounting mechanism includes a mounting ring 13, bolts 14, a mounting flange 15 and a nut 16. One end of the welding section 2 is fixedly connected to the mounting ring 13, one end side wall of the mounting ring 13 is fixedly connected to a plurality of bolts 14, one end side wall of the connecting section 3 is fixedly connected to the mounting flange 15, the other end of each bolt 14 passes through the mounting flange 15 and is threadedly connected to a nut 16. By using the provided mounting ring 13, a plurality of bolts 14 on the side wall pass through the mounting flange 15 and then pass through the nut 16 for rapid installation, and can be disassembled in case of damage.

[0042] In order to seal between the welding section 2 and the connecting section 3 after installation, Figure 1-4As shown, a first sealing clamp ring 20 is fixedly connected to the side wall of one end of the mounting ring 13, and a second sealing clamp ring 21 is fixedly connected to the side wall of one end of the mounting flange 15. The side wall of the first sealing clamp ring 20 is provided with an annular bayonet 22 for clamping with the second sealing clamp ring 21. In this embodiment, the first sealing clamp ring 20 is clamped with the second sealing clamp ring 21 through the annular bayonet 22 provided on the side wall, so as to seal after installation between the welding section 2 and the connecting section 3.

[0043] In addition, considering the convenience of operation, such as Figure 1-3 As shown, in this embodiment, the ends of each of the first screw rod 6 and the second screw rod 18 are fixedly connected with a twisting block 23, and the twisting block 23 is used to facilitate manual rotation of the first screw rod 6 and the second screw rod 18.

[0044] Furthermore, in order to prevent the surfaces of the strip oil groove 10, the annular oil groove 11 and the oil groove 12 from rusting and affecting the flow of the lubricating oil, as Figure 1-3 As shown, the surfaces of the strip oil groove 10, the annular oil groove 11 and the oil groove 12 are all provided with a Teflon stainless coating, and the Teflon stainless coating is used to prevent the surfaces of the strip oil groove 10, the annular oil groove 11 and the oil groove 12 from rusting and affecting the flow of the lubricating oil.

[0045] Embodiment 2

[0046] In another typical embodiment of the present invention, a vehicle rear axle assembly is provided, comprising a vehicle rear axle sleeve and a rear axle housing of embodiment one, wherein the rear axle sleeve is sleeved on the half-axle of the rear axle housing, the welding section of the rear axle sleeve is welded and connected to the rear axle housing, and the threaded section of the rear axle sleeve is installed with the vehicle accessories through a threaded connection.

[0047] Embodiment 3

[0048] In another typical embodiment of the present invention, a method for using the sleeve for the rear axle of an automobile based on the first embodiment is provided, comprising:

[0049] When the inner cavity of the casing needs to be lubricated for maintenance, the first screw rod 6 is rotated upward to separate the plug 8 at the bottom of the first screw rod from the oil injection port 7, and lubricating oil is injected into the inner cavity of the casing through the oil injection port 7; after the injection is completed, the first screw rod 6 is rotated downward to re-seal the plug 8 and the oil injection port 7;

[0050] When the threaded section needs to be oiled for maintenance, the second screw rod 18 is rotated to remove and expose the second oil filling port 9, and lubricating oil is injected from the second oil filling port 9. Lubricating oil is added to the surface thread of the threaded section through the strip oil groove 10, the oil groove 12 and the annular oil groove 11; after completion, the second screw rod 18 is rotated and inserted to drive the sealing ring 19 of the rod wall to seal and clamp the second oil filling port.

[0051] Specifically, during installation, the welding section 2 in the tube body 1 is welded to the rear axle housing, and then the connecting section 2 and the welding section 3 are installed through the installation mechanism.

[0052] When it is necessary to inject lubricating oil into the cavity of the tube body 1, the first screw rods 6 at both ends of the tube wall of the oil injection connecting ring 5 are rotated upward to separate the plug 8 at one end of the first screw rod 6 from the oil injection bayonet 7, and lubricating oil is injected into the oil injection bayonet 7 through the corresponding openings at both ends of the tube wall of the oil injection connecting ring 5. Lubricating oil is injected into the cavity of the tube body 1 to protect the half-axle in the tube body 1, and finally the first screw 6 is rotated downward to engage with the oil injection bayonet 7 through the plug 8 for sealing.

[0053] When it is necessary to inject lubricating oil into the pipe wall thread of the threaded section 4, the second screw 18 in the sealing mechanism is rotated and taken out, and the lubricating oil is injected into the second oil filling port 9, and flows through the corresponding oil groove 12 to the annular oil groove 11 in the pipe wall cavity of the threaded section 4, and finally flows out through a plurality of strip oil grooves 10 to lubricate the thread of the pipe wall of the threaded section 4.

[0054] In this embodiment, since the sealing mechanism seals the second oil filling port 9, when damage occurs and the tube body 1 needs to be replaced, the connecting section 2 and the welding section 3 are disassembled and separated by the installation mechanism, and the welding section 3 and the threaded section 4 are replaced.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Those skilled in the art should understand that the present invention may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sleeve for a rear axle of an automobile, characterized in that: The pipe body comprises a welding section, a connecting section and a threaded section which are fixedly connected in sequence, and the welding section and the connecting section are detachably connected through a mounting mechanism; An oil filling socket is provided on the tube wall at one end of the connecting section close to the welding section, and the oil filling opening is connected with the inner cavity of the tube body; a second oil filling port is provided on the tube wall at one end of the connecting section close to the threaded section, a plurality of strip oil grooves are provided on the tube wall surface of the threaded section, an annular oil groove connected with the plurality of strip oil grooves is provided in the tube wall cavity of the threaded section, an oil flow groove is connected at the bottom of the annular oil groove, and the other end of the oil flow groove extends into the tube wall cavity of the connecting section and is connected with the second oil filling port.

2. A sleeve for a rear axle of an automobile as claimed in claim 1, characterized in that: An oil injection connecting ring is fixedly connected to the outer wall of the connecting section close to the welding section, the oil injection connecting ring is threadedly connected to a first screw rod, a plug is fixedly connected to the bottom of the first screw rod, and the plug is docked with the oil injection bayonet.

3. A sleeve for a rear axle of an automobile as claimed in claim 2, characterized in that: The oil injection connection ring is sleeved on the outer circumferential surface of the connection section, and a threaded opening connected to the first screw rod is opened on the tube wall of the oil injection connection ring.

4. A sleeve for a rear axle of an automobile as claimed in claim 1, characterized in that: A sealing mechanism is provided at the tube wall of the connecting section and is clamped with the second oil filling port. The sealing mechanism includes an arc-shaped clamping seat, a second screw and a sealing ring. The sealing ring and the arc-shaped clamping seat are fixedly arranged on the outer wall of the connecting section. The second screw is threadedly connected to the arc-shaped clamping seat. The sealing ring is fixedly arranged on the outer rod wall of the second screw. The second screw is clamped with the arc-shaped clamping seat through the sealing ring.

5. A sleeve for a rear axle of an automobile as claimed in claim 4, characterized in that: The ends of the second screw rods are fixedly connected with torsion blocks.

6. The sleeve for a rear axle of an automobile as claimed in claim 1, characterized in that: The mounting mechanism comprises a mounting ring and a mounting flange which are respectively fixedly connected to the welding section and the connecting section. A bolt is fixedly connected to one side of the mounting ring. The bolt passes through the mounting flange and is fixedly connected to a nut.

7. A sleeve for a rear axle of an automobile as claimed in claim 6, characterized in that: A second sealing mechanism is also provided between the welding section and the connecting section, and the second sealing mechanism includes a first sealing clamp ring, a second sealing clamp ring and an annular bayonet, the distal ends of the first sealing clamp ring and the second sealing clamp ring are fixedly connected to the side walls of the mounting ring and the mounting flange respectively, and the proximal ends of the first sealing clamp ring and the second sealing clamp ring are clamped through the annular bayonet.

8. The sleeve for a rear axle of an automobile as claimed in claim 1, characterized in that: The surfaces of the strip oil groove, the annular oil groove and the oil runner are all provided with Teflon stainless coating.

9. An automobile rear axle assembly, comprising a rear axle housing and a sleeve for an automobile rear axle according to any one of claims 1 to 8, characterized in that: The rear axle sleeve is sleeved on the half shaft of the rear axle housing, and the welding section of the rear axle sleeve is welded and connected to the rear axle housing.

10. A method for using the sleeve for a rear axle of an automobile according to any one of claims 1 to 8, characterized in that: include: When the inner cavity of the casing needs to be oiled for maintenance, the first screw is rotated upward to separate the plug from the oil injection port, and lubricating oil is injected into the inner cavity of the casing through the oil injection port; after the injection is completed, the first screw is rotated downward to re-seal and engage the plug with the oil injection port; When the threaded section needs to be oiled for maintenance, the second screw rod is rotated and removed to expose the second oil filling port, and lubricating oil is injected from the second oil filling port. Lubricating oil is added to the surface thread of the threaded section through the strip oil groove, the oil outlet and the annular oil groove; after completion, the second screw rod is rotated and inserted to drive the sealing ring of the rod wall to seal and clamp the second oil filling port.

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