Oil seal assembly and machining method

Abstract

The invention discloses an oil seal assembly and a machining method, and relates to the technical field of sealing, the oil seal assembly comprises a mounting base, a first oil seal structure, a second oil seal structure and a pressure regulating structure, the mounting base is used for being mounted in a sleeve, and a through hole is formed in the end face, arranged in the circumferential direction, of the mounting base and used for allowing a piston connecting rod to penetrate through; the first oil seal structure is annularly arranged and fixedly arranged in the via hole, the first oil seal structure is used for slidably abutting against the outer side wall of the piston connecting rod, at least part of the first oil seal structure is located in the pressure cavity, an adjusting cavity is formed in the first oil seal structure, and the second oil seal structure is annularly arranged and axially arranged in the via hole at intervals with the first oil seal structure. The second oil seal structure is used for abutting against the outer side wall of the piston connecting rod in a sliding mode, the pressure adjusting structure has a communicating state and a closing state, the adjusting cavity communicates with the pressure cavity in the communicating state, and the adjusting cavity is separated from the pressure cavity in the closing state. Through the arrangement, the assembly error of the oil seal assembly can be reduced, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of sealing, and in particular to an oil seal component and a processing method thereof. Background Art

[0002] Existing shock absorber oil seals are mostly metal frames and rubber vulcanized in one. Compared with traditional double-tube shock absorbers, they have the advantages of simple installation and low cost. However, in the field of high-pressure shock absorbers, integrated oil seals are difficult to meet the demand due to insufficient pressure-bearing capacity, so they are developed into combined oil seals.

[0003] However, the combined oil seals in the prior art are mostly formed by segmented vulcanization, and after assembly, they are sent to the shock absorber manufacturer for overall assembly. The accumulated errors during the assembly process are large, and the interference of the main sealing lip of the oil seal cannot be automatically matched according to different pressure environments. Summary of the invention

[0004] The main purpose of the present invention is to propose an oil seal assembly and a processing method, aiming to improve the problem that the existing oil seal has large error accumulation during the assembly process and cannot automatically match the interference of the main sealing lip of the oil seal according to different pressure environments.

[0005] To achieve the above object, the oil seal assembly proposed in the present invention is used to be installed on a piston structure, wherein the piston structure includes a sleeve and a piston connecting rod arranged in the sleeve, and the oil seal assembly, the head cover and the piston connecting rod define a closed pressure chamber, and the oil seal assembly includes:

[0006] A mounting seat, used for being mounted in the sleeve, wherein a through hole is provided on the end surface of the mounting seat arranged along the circumferential direction, so as to allow the piston connecting rod to pass through;

[0007] a first oil seal structure, which is arranged in an annular shape and fixedly arranged in the through hole, the first oil seal structure is used for slidingly abutting against the outer side wall of the piston connecting rod, and is at least partially located in the pressure chamber, and the first oil seal structure has an adjustment chamber;

[0008] a second oil seal structure, which is arranged in an annular shape and is spaced apart from the first oil seal structure in the axial direction in the through hole, and the second oil seal structure is used for slidingly abutting against the outer side wall of the piston connecting rod; and

[0009] The pressure regulating structure has a connected state and a closed state. In the connected state, the pressure regulating structure enables the regulating chamber to be connected with the pressure chamber. In the closed state, the pressure regulating structure enables the regulating chamber to be separated from the pressure chamber.

[0010] In one embodiment, the first oil seal structure comprises:

[0011] A first frame is arranged in a ring shape, and an outer edge of the first frame is arranged to be pressed against a hole wall of the via hole;

[0012] a first elastic sealing portion, which is arranged in an annular shape, is disposed on the inner edge of the first frame and is used for elastically contacting with the outer side wall of the piston connecting rod; and

[0013] The adjusting ring is elastically arranged and is disposed at one end of the first frame in the axial direction, and partially extends into the pressure chamber. The adjusting ring and the first elastic sealing portion enclose and define the adjusting chamber.

[0014] In one embodiment, a pressure-stabilizing hole is provided on the wall of the regulating chamber, the pressure-stabilizing hole is connected to the regulating chamber and the pressure chamber, the pressure-regulating structure includes a throttle valve, the throttle valve is correspondingly arranged in the regulating chamber, and the switching between the connected state and the closed state is achieved by controlling the opening and closing of the throttle valve; and / or,

[0015] A pressure relief hole is provided on the wall of the regulating chamber, and the pressure relief hole connects the regulating chamber with the outside. The pressure regulating structure also includes a pressure relief valve, and the pressure relief valve is correspondingly arranged in the regulating chamber. The pressure in the regulating chamber is adjusted by controlling the opening and closing of the pressure relief valve.

[0016] In one embodiment, the first frame and the second oil seal structure enclose an oil storage cavity, and the oil storage cavity is located in the through hole to store lubricating oil;

[0017] The pressure relief hole is connected to the regulating chamber and the oil storage chamber.

[0018] In one embodiment, the second oil seal structure comprises:

[0019] A second frame is arranged in an annular shape, and an outer edge of the second frame is tightly against the hole wall of the through hole and is arranged against the first oil seal structure; and,

[0020] The second elastic sealing portion is arranged in an annular shape and is arranged on the inner edge of the second frame. The second elastic sealing portion is used for elastically contacting with the piston connecting rod.

[0021] In one embodiment, the second oil seal structure comprises:

[0022] A second frame is arranged in an annular shape, and an outer edge of the second frame is tightly against the hole wall of the through hole and is arranged against the first oil seal structure; and,

[0023] The second elastic sealing portion is arranged in an annular shape and is arranged on the inner edge of the second frame. The second elastic sealing portion is used for elastically contacting with the piston connecting rod.

[0024] In one embodiment, the through hole includes a plurality of hole segments arranged in sequence along the axial direction, the diameter of the hole segment located in the middle is greater than the diameter of the hole segment located at the edge, and both end surfaces of the two hole segments located at the edge in the axial direction are bearing surfaces;

[0025] The first oil seal structure is located in the hole section located in the middle and one of the hole sections located at the edge, and abuts against the corresponding bearing surface;

[0026] The second oil seal structure is located in the hole section located in the middle and another hole section located at the edge, and abuts against the corresponding bearing surfaces.

[0027] In one embodiment, one of the bearing surfaces is provided with an annular groove, the first oil seal structure is provided with a sealing ring, the sealing ring extends into the groove and abuts against the bottom of the groove; and / or,

[0028] The second sealing structure includes a second skeleton and a second elastic sealing portion. The second skeleton is arranged in an annular shape, and the outer edge thereof is pressed against the hole wall of the hole section located in the middle. The second skeleton has two oppositely arranged ends, one end of which is pressed against the first oil seal structure, and the other end is bent toward the axial direction of the mounting seat to form a bent section. The second elastic sealing portion is arranged in an annular shape, is arranged on the inner edge of the second skeleton, and is at least partially sleeved on the bent section to form a third sealing protrusion, and the third sealing protrusion is pressed against the other bearing surface.

[0029] The present invention also proposes a processing method for an oil seal assembly, based on the above-mentioned oil seal assembly, the through hole includes a plurality of hole segments arranged in sequence along the axial direction, the diameter of the hole segment located in the middle is larger than the diameter of the hole segment located at the edge, and the two end surfaces of the two hole segments located at the edge in the axial direction are bearing surfaces; the first oil seal structure includes a first skeleton, a first elastic sealing portion and an adjusting ring, the first skeleton is arranged in an annular shape, installed therein with the bearing surface, and the outer edge is pressed against the hole wall of the hole segment located in the middle, the first elastic sealing portion is arranged in an annular shape, arranged at the inner edge of the first skeleton, and is used to elastically abut against the outer side wall of the piston connecting rod, the adjusting ring is elastically arranged, and is arranged in the One end of the first skeleton in the axial direction partially extends into the pressure chamber, and the adjustment ring and the first elastic sealing portion enclose and define the adjustment chamber; the second sealing structure includes a second skeleton and a second elastic sealing portion, the second skeleton is arranged in an annular shape, and the outer edge thereof abuts against the hole wall of the hole section located in the middle, the second skeleton has two oppositely arranged ends, one end of which abuts against the first oil seal structure, and the other end is bent toward the axial direction of the mounting seat to form a bent section, the second elastic sealing portion is arranged in an annular shape, is arranged at the inner edge of the second skeleton, and is at least partially sleeved on the bent section to form a third sealing protrusion, and the third sealing protrusion abuts against the other bearing surface;

[0030] The processing method of the oil seal assembly comprises:

[0031] Provide a cylindrical incoming material, wherein the cylindrical incoming material has a hole section located in the middle and a hole section located at the edge, the diameter of the hole section located in the middle is larger than the diameter of the hole section located at the edge, and the end surface of the hole section located at the edge facing the hole section located in the middle is a bearing surface;

[0032] Install the first oil seal structure into the hole section located in the middle and the hole section located at the edge, so that the first frame is installed into the hole section located in the middle and pressed against the bearing surface of the hole section located at the edge, and the first elastic seal and the adjustment ring are pressed against the side wall of the hole section located at the edge;

[0033] Install the second oil seal structure into the hole section located in the middle, so that the second frame is installed into the hole section located in the middle, and the outer edge is pressed against the side wall of the hole section located in the middle, one end is pressed against the first frame, and the second elastic sealing part is partially installed into the hole section located in the middle;

[0034] The end of the cylindrical incoming material that is axially away from the first oil seal structure is bent toward its own axis to form the mounting seat and obtain another hole segment located at the edge, so that the corresponding bearing surface of the hole segment located at the edge is pressed against the third sealing protrusion.

[0035] In one embodiment, the first frame, the first elastic seal and the adjustment ring are integrally formed by vulcanization; and / or,

[0036] The second frame and the second elastic sealing portion are integrally formed by vulcanization.

[0037] In the technical solution of the present invention, the oil seal assembly is installed in the sleeve, and the piston is inserted into the oil seal assembly, so that the piston structure is sealed by the first oil seal structure, the second oil seal mechanism and the mounting seat, and the air pressure in the pressure chamber is increased so that the air pressure environment in the pressure chamber is always in a high-pressure environment. At this time, in order to buffer the pressure effect of the high pressure in the pressure chamber on the oil seal assembly, the regulating structure is switched to a connected state to connect the regulating chamber and the pressure chamber, so as to drain part of the gas in the pressure chamber into the regulating chamber, thereby adjusting the pressure difference between the pressure chamber and the regulating chamber, so as to adjust the lip interference of the first oil seal structure, while ensuring the sealing ability of the first oil seal structure, avoiding the oil seal assembly from being damaged by excessive pressure, and when the air pressure in the regulating chamber is about to reach the pressure threshold that the regulating chamber can withstand, the regulating structure is switched to a closed state to separate the regulating chamber and the pressure chamber, so as to avoid the pressure in the regulating chamber being too high and compressing the first oil seal structure. In such a configuration, since the mounting seat is directly installed in the sleeve, the first oil seal structure and the second oil seal structure are directly installed on the mounting seat, thereby being able to reduce the error generated during the assembly of the oil seal assembly and save costs. At the same time, the setting of the adjustment chamber enables the oil seal assembly to automatically adjust the sealing ability of the first oil seal structure according to the different pressures in the pressure chamber, which can not only ensure the sealing reliability of the oil seal assembly, but also improve the durability of the oil seal assembly and extend the service life of the oil seal assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0039] Figure 1 A schematic structural diagram of an embodiment of an oil seal assembly provided by the present invention;

[0040] Figure 2 for Figure 1 A schematic cross-sectional view of the oil seal assembly;

[0041] Figure 3 for Figure 2 A cross-sectional schematic diagram of the first oil seal structure and the pressure regulating structure;

[0042] Figure 4 for Figure 2 A partial cross-sectional schematic diagram of the second oil seal structure;

[0043] Figure 5 A schematic flow chart of a method for processing an oil seal assembly provided by the present invention.

[0044] Description of Figure Numbers:

[0045] 100. Oil seal assembly; 1. Mounting seat; 11. Through hole; 2. First oil seal structure; 21. Adjusting chamber; 22. First skeleton; 23. First elastic sealing part; 24. Adjusting ring; 25. Pressure stabilizing hole; 26. Pressure relief hole; 27. Sealing ring; 3. Second oil seal structure; 31. Oil storage chamber; 32. Second skeleton; 33. Second elastic sealing part; 331. Annular mounting body; 332. First sealing protrusion; 333. Second sealing protrusion; 334. Annular elastic member; 335. Third sealing protrusion; 4. Pressure regulating structure; 41. Throttle valve; 42. Pressure relief valve; 5. O-ring.

[0046] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0048] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0050] The present invention provides an oil seal assembly, which aims to improve the problem that the existing oil seal has large error accumulation during the assembly process and cannot automatically match the interference of the main sealing lip of the oil seal according to different pressure environments.

[0051] See also Figure 1-2 In one embodiment of the present invention, the oil seal assembly 100 is used to be installed in a piston structure, and the piston structure includes a sleeve and a piston connecting rod arranged in the sleeve. The oil seal assembly 100, the head cover and the piston connecting rod define a closed pressure chamber. The oil seal assembly 100 includes a mounting seat 1, a first oil seal structure 2, a second oil seal structure 3 and a pressure regulating structure 4. The mounting seat 1 is used to be installed in the sleeve. A through hole 11 is provided on the end surface of the mounting seat 1 arranged along the circumferential direction for the piston connecting rod to pass through. The first oil seal structure 2 is arranged in an annular shape and is fixedly arranged in the through hole 11. The second oil seal structure 3 and the pressure regulating structure 4 are provided in a plurality of positions. An oil seal structure 2 is used to slide against the outer wall of the piston connecting rod and is at least partially in the pressure chamber. The first oil seal structure 2 has an adjusting chamber 21. The second oil seal structure 3 is arranged in an annular shape and is axially spaced from the first oil seal structure 2 in the through hole 11. The second oil seal structure 3 is used to slide against the outer wall of the piston connecting rod. The pressure regulating structure 4 has a connected state and a closed state. In the connected state, the pressure regulating structure 4 connects the adjusting chamber 21 with the pressure chamber. In the closed state, the pressure regulating structure 4 separates the adjusting chamber 21 from the pressure chamber.

[0052] In the technical solution of the present invention, the oil seal assembly 100 is installed in the sleeve, and the piston is inserted into the oil seal assembly 100, so that the piston structure is sealed by the first oil seal structure 2, the second oil seal mechanism and the mounting seat 1, and the air pressure in the pressure chamber is increased so that the air pressure environment in the pressure chamber is always in a high-pressure environment. At this time, in order to buffer the pressure effect of the high pressure in the pressure chamber on the oil seal assembly 100, the regulating structure is switched to a connected state to connect the regulating chamber 21 and the pressure chamber, so that the pressure in the pressure chamber is Part of the gas is drained into the regulating chamber 21, thereby adjusting the pressure difference between the pressure chamber and the regulating chamber 21 to adjust the lip interference of the first oil seal structure 2, while ensuring the sealing ability of the first oil seal structure 2, preventing the oil seal assembly 100 from being damaged by excessive pressure. When the air pressure in the regulating chamber 21 is about to reach the pressure threshold that the regulating chamber 21 can withstand, the regulating structure is switched to a closed state to separate the regulating chamber 21 from the pressure chamber, to prevent the pressure in the regulating chamber 21 from being too high and causing the first oil seal structure 2 to explode. In such a configuration, since the mounting seat 1 is directly mounted in the sleeve, and the first oil seal structure 2 and the second oil seal structure 3 are directly mounted on the mounting seat 1, the error generated during the assembly of the oil seal assembly 100 can be reduced, saving costs. At the same time, the configuration of the adjustment chamber 21 enables the oil seal assembly 100 to automatically adjust the sealing ability of the first oil seal structure 2 according to the different pressures in the pressure chamber, which can not only ensure the sealing reliability of the oil seal assembly 100, but also improve the durability of the oil seal assembly 100 and extend the service life of the oil seal assembly 100.

[0053] It should be noted that, in an embodiment of the present invention, when the pressure regulating structure 4 is switched to a connected state so that the gas enters the regulating chamber 21 from the pressure chamber, thereby adjusting the pressure difference between the pressure chamber and the regulating chamber 21, the air pressure in the regulating chamber 21 will change with the change of the air pressure in the pressure chamber, thereby adaptively adjusting the lip interference of the first oil seal structure 2 according to different pressures, so as to perform local decompression while ensuring the strength of the rubber itself, thereby achieving sealing to the greatest extent.

[0054] It should also be noted that, since the first oil seal structure 2 is arranged in an annular shape, in order to ensure the decompression effect of the regulating chamber 21, in the present invention, the regulating chamber 21 is also arranged in an annular shape.

[0055] In addition, since the first oil seal structure 2 is at least partially located in the pressure chamber, and the second oil seal structure 3 is located on the side of the first oil seal structure 2 that is axially opposite to the pressure chamber, the environmental pressure of the first oil seal structure 2 is greater than the environmental pressure of the second oil seal structure 3. In order to enable the first oil seal structure 2 and the second oil seal structure 3 to take into account their own working environments respectively, in one embodiment of the present invention, the material of the first oil seal structure 2 can be set to a high-temperature rubber material, and the material of the second oil seal structure 3 can be set to a low-temperature rubber material. With this arrangement, the first oil seal structure 2 can adapt to a high-temperature and high-pressure working environment, and the second oil seal structure 3 can adapt to a low-temperature and low-pressure working environment, thereby ensuring the sealing performance of the oil seal assembly 100.

[0056] In addition, the present invention does not limit the specific structural form of the first oil seal structure 2. Figure 3 In one embodiment of the present invention, the first oil seal structure 2 includes a first skeleton 22, a first elastic sealing portion 23 and an adjusting ring 24. The first skeleton 22 is arranged in an annular shape, and the outer edge of the first skeleton 22 is arranged to be close to the hole wall of the through hole 11. The first elastic sealing portion 23 is arranged in an annular shape, arranged at the inner edge of the first skeleton 22, and is used to elastically abut against the outer side wall of the piston connecting rod. The adjusting ring 24 is elastically arranged and arranged at one end of the first skeleton 22 in the axial direction, and partially extends into the pressure chamber. The adjusting ring 24 and the first elastic sealing portion 23 enclose and define the adjusting chamber 21. It can be understood that the first elastic sealing portion 23 is equivalent to the main sealing lip of the first oil seal structure 2. In this way, the first skeleton 22 provides the first oil seal structure 2 with a supporting strength, and the first elastic sealing portion 23 and the adjusting ring 24 can ensure the sealing performance of the first oil seal structure 2.

[0057] It is understandable that in order to ensure that the first elastic sealing portion 23 can enclose the adjustment ring 24 to define the adjustment cavity 21, in a further embodiment of the present invention, the first elastic sealing portion 23 at least partially extends axially to one axial end of the first skeleton 22, and at least partially protrudes axially from the first skeleton 22 to contact with the adjustment ring 24, thereby achieving the goal of jointly defining the adjustment cavity 21 with the adjustment ring 24.

[0058] It should also be noted that, since the first elastic sealing portion 23 and the adjustment ring 24 enclose and define the adjustment cavity 21, in a further embodiment of the present invention, when the adjustment cavity 21 is deformed, the adjustment ring 24 and the first elastic sealing component are deformed in the radial direction together.

[0059] To ensure the elastic properties of the first elastic sealing portion 23 and the adjusting ring 24 , in another embodiment of the present invention, the first elastic sealing portion 23 and the adjusting ring 24 are both made of rubber.

[0060] Of course, the present invention does not limit the specific structural form of the regulating structure. In one embodiment of the present invention, a pressure-stabilizing hole 25 is opened on the wall of the regulating chamber 21, and the pressure-stabilizing hole 25 connects the regulating chamber 21 and the pressure chamber. The pressure regulating structure 4 includes a throttle valve 41, and the throttle valve 41 is correspondingly arranged in the regulating chamber 21. The opening and closing of the throttle valve 41 are controlled to switch between the connected state and the closed state. In this way, when the pressure in the pressure chamber is too large and part of the gas in the pressure chamber needs to be filled into the regulating chamber 21, the throttle valve 41 works to draw part of the gas in the pressure chamber into the regulating chamber 21 in proportion, so as to reduce the pressure between the pressure chamber and the regulating chamber 21 and improve the service life of the oil seal assembly 100.

[0061] It should also be noted that, when only the throttle valve 41 is closed to isolate the pressure chamber and the regulating chamber 21, the other pressure in the regulating chamber 21 is still close to the threshold of the first elastic sealing portion 23 and the adjusting ring 24. Therefore, in order to prevent the first elastic sealing portion 23 and the adjusting ring 24 from being damaged, the pressure in the regulating chamber 21 can also be reduced by other means. In another embodiment of the present invention, a pressure relief hole 26 is opened on the wall of the regulating chamber 21, and the pressure relief hole 26 connects the regulating chamber 21 with the outside world. The pressure regulating structure 4 also includes a pressure relief valve 42, which is correspondingly arranged in the regulating chamber 21. The pressure in the regulating chamber 21 is adjusted by controlling the opening and closing of the pressure relief valve 42. In this way, when the pressure in the regulating chamber 21 approaches the threshold value of the first elastic sealing portion 23 and the adjusting ring 24, the pressure relief valve 42 opens to connect the regulating chamber 21 to the outside. At this time, the gas in the regulating chamber 21 can flow to the outside, thereby reducing the pressure in the regulating chamber 21 and preventing the first elastic sealing portion 23 and the adjusting ring 24 from being damaged.

[0062] Of course, the actions of the throttle valve 41 and the pressure relief valve 42 can also be controlled simultaneously. In another embodiment of the present invention, when the pressure in the regulating chamber 21 approaches the threshold value of the first elastic sealing portion 23 and the adjusting ring 24, the throttle valve 41 is closed to separate the regulating chamber 21 from the pressure chamber. At the same time, the pressure relief valve 42 is opened to connect the regulating chamber 21 with the outside world, so that the gas in the regulating chamber 21 flows to the outside world under the premise of stopping the gas from being filled into the regulating chamber 21, so as to further improve the service life of the first oil seal structure 2.

[0063] In addition, the present invention does not limit the specific position to which the pressure relief hole 26 is connected. In one embodiment of the present invention, the pressure relief hole 26 can be directly connected to the atmospheric environment.

[0064] In another embodiment of the present invention, the first skeleton 22 and the second oil seal structure 3 enclose an oil storage chamber 31, and the oil storage chamber 31 is located in the through hole 11 to store lubricating oil, and the pressure relief hole 26 is connected to the regulating chamber 21 and the oil storage chamber 31. In this way, when the pressure in the regulating chamber 21 is close to the threshold of the first elastic sealing part 23 and the regulating ring 24, the pressure in the regulating chamber 21 can enter the oil storage chamber 31 from the pressure relief valve 42, so as to balance the pressure in the regulating chamber 21. At the same time, when the pressure is released, the pressure in the oil storage chamber 31 will change from normal pressure to low pressure. At this time, the lubricating oil contained in the oil storage chamber 31 can further lubricate the contact position between the second oil seal structure 3 and the piston connecting rod, so as to reduce the wear between the second oil seal structure 3 and the piston connecting rod.

[0065] It should be noted that the setting of the oil storage chamber 31 can not only enable the lubricating oil in the oil storage chamber 31 to lubricate the contact positions between the first oil seal structure 2 and the second oil seal structure 3 and the piston connecting rod, but also can cool the second oil seal structure 3 in a high temperature environment, thereby preventing the second oil seal structure 3 from losing its low-temperature performance due to excessively high temperature.

[0066] In addition, the present invention does not limit the specific structural form of the second oil seal structure 3. Figure 4 In one embodiment of the present invention, the second oil seal structure 3 includes a second skeleton 32 and a second elastic sealing portion 33. The second skeleton 32 is arranged in an annular shape. The outer edge of the second skeleton 32 is pressed against the hole wall of the through hole 11 and is arranged against the first oil seal structure 2. The second elastic sealing portion 33 is arranged in an annular shape and is arranged at the inner edge of the second skeleton 32. The second elastic sealing portion 33 is used to elastically abut against the piston connecting rod. It can be understood that the second skeleton 32 provides an installation reference for the second elastic sealing portion 33. At the same time, the second skeleton 32 abuts against the first skeleton 22 of the first oil seal structure 2 to enclose the oil storage cavity 31 with the first skeleton 22. The second elastic sealing portion 33 provides a second seal for the piston connecting rod.

[0067] In order to ensure the sealing effect of the second elastic seal, in one embodiment of the present invention, the second elastic seal includes an annular mounting body 331 and an annular elastic member 334, the annular mounting body 331 is elastically arranged, and the inner edge of the annular mounting body 331 is formed with a first sealing protrusion 332 and a second sealing protrusion 333, the first sealing protrusion 332 and the second sealing protrusion 333 are axially spaced apart, and the first sealing protrusion 332 is arranged close to the first oil seal structure 2, the first sealing protrusion 332 and the second sealing protrusion 333 are both used to elastically abut the side wall of the piston connecting rod, and the annular elastic member 334 is sleeved on the outer edge of the annular mounting body 331 to limit the elastic deformation of the annular mounting body 331 in the radial direction of the mounting seat 1. With such a configuration, the first sealing protrusion 332 can slide against the piston connecting rod, thereby further improving the sealing performance of the oil seal assembly 100. At the same time, the lubricating oil in the oil storage chamber 31 can be restricted to the oil storage chamber 31 to prevent the lubricating oil from leaking out of the oil storage chamber 31. The second sealing protrusion 333 can play a dustproof role to isolate the first sealing protrusion 332, the oil storage chamber 31, the first oil seal assembly 100 and the pressure chamber from the outside world, thereby preventing external dust and impurities from entering the interior of the oil seal assembly 100, thereby affecting the normal sealing ability of the oil seal assembly 100.

[0068] The provision of the annular elastic member 334 can further enhance the pressing force of the first sealing protrusion 332 and the second sealing protrusion 333 on the piston connecting rod, and increase the radial pressure of the first sealing protrusion 332 and the second sealing protrusion 333, thereby further enhancing the sealing effect of the second oil seal structure 3.

[0069] It should be further explained that, in order to improve the installation stability of the first oil seal structure 2, in one embodiment of the present invention, the through hole 11 includes a plurality of hole segments arranged in sequence along the axial direction, the diameter of the hole segment located in the middle is larger than the diameter of the hole segment located at the edge, and the two end surfaces of the two hole segments located at the edge in the axial direction are bearing surfaces, the first oil seal structure 2 is located in the hole segment located in the middle and one of the hole segments located at the edge, and abuts against the corresponding bearing surfaces. Such a configuration can further limit the movement of the first oil seal structure 2 in the axial direction, thereby improving the installation stability of the first oil seal structure 2.

[0070] Specifically, in this embodiment, the first skeleton 22 is installed in the hole section located in the middle and is pressed against the bearing surface of the hole section located at the edge, the first elastic seal and the adjustment ring 24 are pressed against the side wall of the hole section located at the edge, and the first elastic seal and the adjustment ring 24 are at least partially protruded from the hole section located at the edge.

[0071] In order to further improve the sealing performance of the oil seal assembly 100, the sealing performance between the first oil seal structure 2 and the mounting seat 1 can be further improved. In a further embodiment of the present invention, one of the bearing surfaces is concavely provided with an annular groove, and the first oil seal structure 2 is provided with a sealing ring 27. The sealing ring 27 extends into the groove and abuts against the bottom of the groove. In this way, the elastic abutment between the sealing ring 27 and the annular groove can further improve the abutment sealing ability between the first oil seal structure 2 and the mounting seat 1, thereby ensuring the sealing performance of the oil seal assembly 100 again.

[0072] Similarly, in order to improve the installation stability of the second oil seal structure 3, in another embodiment of the present invention, the second oil seal structure 3 is located in the hole section located in the middle and another hole section located at the edge, and abuts against the corresponding bearing surface. Such an arrangement can further limit the movement of the second oil seal structure 3 in the axial direction, thereby improving the installation stability of the second oil seal structure 3.

[0073] Specifically, in this embodiment, the second skeleton 32 is installed in the hole section located in the middle, and the outer edge is pressed against the side wall of the hole section located in the middle, one end is pressed against the first skeleton 22, and the second elastic sealing part 33 is partially installed in the hole section located in the middle.

[0074] Of course, the sealing performance of the oil seal assembly 100 can be improved by further improving the sealing performance between the second oil seal structure 3 and the mounting seat 1. In a further embodiment of the present invention, the second skeleton 32 is bent at one end away from the first oil seal structure 2 toward the axial direction of the mounting seat 1 to form a bent section. The second elastic sealing portion 33 is annularly arranged, arranged at the inner edge of the second skeleton 32, and at least partially sleeved on the bent section to form a third sealing convex portion 335, and the third sealing convex portion 335 abuts against another bearing surface. In this way, the third sealing convex portion 335 can elastically abut against the bearing surface of the corresponding hole section located at the edge, thereby further improving the abutment sealing ability between the second oil seal structure 3 and the mounting seat 1, so as to achieve the purpose of improving the sealing ability of the oil seal assembly 100.

[0075] In addition, the oil seal assembly 100 not only needs to ensure the sealing cooperation between its own internal structure, but also needs to ensure the sealing cooperation between the mounting seat 1 and the sleeve. In an embodiment of the present invention, an O-ring is provided on the outer side surface of the mounting seat 1, and the O-ring is used to abut the outer side surface of the mounting seat 1 and the inner side surface of the sleeve. The provision of the O-ring can further improve the static sealing ability between the mounting seat 1 and the sleeve.

[0076] Of course, the present invention does not limit the specific number of the O-rings. In one embodiment of the present invention, only one O-ring may be provided; while in another embodiment of the present invention, multiple O-rings may be provided, and the multiple O-rings are spaced apart in the axial direction.

[0077] The present invention also provides a method for processing an oil seal assembly. Based on the above oil seal assembly 100, please refer to Figure 5 , the processing method of the oil seal assembly comprises:

[0078] S100, providing a cylindrical incoming material, wherein the cylindrical incoming material has a hole section located in the middle and a hole section located at the edge, the diameter of the hole section located in the middle is larger than the diameter of the hole section located at the edge, and the end surface of the hole section located at the edge facing the hole section located in the middle is a bearing surface;

[0079] It can be understood that the cylindrical raw material is the semi-finished material of the mounting seat 1 , and the cylindrical raw material can provide a mounting reference for the first oil seal structure 2 and the second oil seal structure 3 .

[0080] S200, installing the first oil seal structure 2 into the hole section located in the middle and the hole section located at the edge, so that the first framework 22 is installed into the hole section located in the middle and pressed against the bearing surface of the hole section located at the edge, and the first elastic seal and the adjustment ring 24 are pressed against the side wall of the hole section located at the edge together;

[0081] In this way, the bearing surface of the hole section located at the edge can limit the axial movement of the first oil seal structure 2, and the side wall of the hole section located at the edge can limit the radial movement of the first oil seal structure 2, thereby ensuring the installation stability of the first oil seal structure 2.

[0082] S300, installing the second oil seal structure 3 into the hole section located in the middle, so that the second skeleton 32 is installed into the hole section located in the middle, and the outer edge thereof is pressed against the side wall of the hole section located in the middle, one end thereof is pressed against the first skeleton 22, and the second elastic sealing portion 33 is partially installed into the hole section located in the middle;

[0083] It can be understood that, since the second skeleton 32 abuts against the first skeleton 22, the first skeleton 22 can limit the movement of the second oil seal structure 3 in the axial direction toward the first oil seal structure 2, and the abutment of the second skeleton 32 with the side wall of the hole section located in the middle can limit the movement of the second oil seal structure 3 in the radial direction, thereby ensuring the installation stability of the second oil seal structure 3.

[0084] S400, bend the end of the cylindrical incoming material away from the first oil seal structure 2 in the axial direction toward its own axis to form the mounting seat 1, and obtain another hole segment located at the edge, so that the corresponding bearing surface of the hole segment located at the edge is tightly pressed against the third sealing protrusion 335.

[0085] It should be noted that, in order to prevent the second oil seal structure 3 and the first oil seal structure 2 from moving in a direction away from the pressure chamber, thereby causing the installation and cooperation of the second oil seal structure 3 and the first oil seal structure 2 to fail, the bearing surface of the other hole section located at the edge is pressed against the third sealing protrusion 335, thereby improving its static sealing ability and limiting the movement of the second oil seal structure 3 and the first oil seal structure 2 in a direction away from the pressure chamber, thereby completing the movement restriction of the first oil seal structure 2 and the second oil seal structure 3 in all directions by the mounting seat 1.

[0086] In the technical solution of the present invention, the cylindrical material is first provided, and then the first oil seal structure 2 is installed in the hole section located in the middle and the hole section located at the edge to complete the preliminary positioning of the first oil seal structure 2, and then the second oil seal structure 3 is installed in the hole section located in the middle to complete the preliminary positioning of the second oil seal structure 3, and finally the end of the cylindrical material away from the first oil seal structure 2 in the axial direction is bent toward its own axis direction to form the mounting seat 1. At this time, the two bearing surfaces of the mounting seat 1 can jointly limit the axial movement of the first oil seal structure 2 and the second oil seal structure 3 to complete the final positioning of the first oil seal structure 2 and the second oil seal structure 3, and obtain the oil seal assembly 100. In this way, the mounting seat 1 can be fixed with the first oil seal structure 2 and the second oil seal structure 3 as a whole, so as to reduce the error generated in the assembly process of the oil seal assembly 100 and save costs.

[0087] It should be noted that, in order to further reduce the error generated during the assembly of the oil seal assembly 100, in one embodiment of the present invention, the first frame 22, the first elastic seal and the adjustment ring 24 are integrally formed by vulcanization. Such a configuration can reduce the error generated during the assembly of the first oil seal structure 2, thereby reducing the error generated during the assembly of the oil seal assembly 100, while also ensuring the overall structural strength of the first oil seal structure 2.

[0088] Similarly, in another embodiment of the present invention, the second skeleton 32 and the second elastic sealing portion 33 are integrally formed by vulcanization. In this way, by reducing the error of the second oil seal structure 3 during the assembly process, the error generated during the assembly process of the oil seal assembly 100 can also be reduced, and the overall structural strength of the second oil seal structure 3 can also be ensured.

[0089] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An oil seal assembly, used for installation on a piston structure, the piston structure comprising a sleeve and a piston connecting rod arranged in the sleeve, the oil seal assembly, the head cover and the piston connecting rod defining a closed pressure chamber, characterized in that: include: A mounting seat, used for being mounted in the sleeve, wherein a through hole is provided on the end surface of the mounting seat arranged along the circumferential direction, so as to allow the piston connecting rod to pass through; a first oil seal structure, which is arranged in an annular shape and fixedly arranged in the through hole, the first oil seal structure is used for slidingly abutting against the outer side wall of the piston connecting rod, and is at least partially located in the pressure chamber, and the first oil seal structure has an adjustment chamber; a second oil seal structure, which is arranged in an annular shape and is spaced apart from the first oil seal structure in the axial direction in the through hole, and the second oil seal structure is used for slidingly abutting against the outer side wall of the piston connecting rod; and The pressure regulating structure has a connected state and a closed state. In the connected state, the pressure regulating structure enables the regulating chamber to be connected with the pressure chamber. In the closed state, the pressure regulating structure enables the regulating chamber to be separated from the pressure chamber.

2. The oil seal assembly according to claim 1, characterized in that: The first oil seal structure comprises: A first frame is arranged in a ring shape, and an outer edge of the first frame is arranged to be pressed against a hole wall of the via hole; a first elastic sealing portion, which is arranged in an annular shape, is disposed at the inner edge of the first frame and is used for elastically contacting with the outer side wall of the piston connecting rod; and The adjusting ring is elastically arranged and is disposed at one end of the first frame in the axial direction, and partially extends into the pressure chamber. The adjusting ring and the first elastic sealing portion enclose and define the adjusting chamber.

3. The oil seal assembly according to claim 2, characterized in that: A pressure-stabilizing hole is provided on the wall of the regulating chamber, and the pressure-stabilizing hole is connected to the regulating chamber and the pressure chamber. The pressure-regulating structure includes a throttle valve, and the throttle valve is correspondingly arranged in the regulating chamber. The switching between the connected state and the closed state is achieved by controlling the opening and closing of the throttle valve. and / or, A pressure relief hole is provided on the wall of the regulating chamber, and the pressure relief hole connects the regulating chamber with the outside. The pressure regulating structure also includes a pressure relief valve, and the pressure relief valve is correspondingly arranged in the regulating chamber. The pressure in the regulating chamber is adjusted by controlling the opening and closing of the pressure relief valve.

4. The oil seal assembly according to claim 3, characterized in that: The first frame and the second oil seal structure enclose an oil storage cavity, and the oil storage cavity is located in the through hole to store lubricating oil; The pressure relief hole is connected to the regulating chamber and the oil storage chamber.

5. The oil seal assembly according to claim 1, characterized in that: The second oil seal structure comprises: A second frame is arranged in an annular shape, and an outer edge of the second frame is tightly against the hole wall of the through hole and is arranged against the first oil seal structure; and, The second elastic sealing portion is arranged in an annular shape and is arranged on the inner edge of the second frame. The second elastic sealing portion is used for elastically contacting with the piston connecting rod.

6. The oil seal assembly according to claim 5, characterized in that: The second elastic sealing portion comprises: an annular mounting body, which is elastically arranged, and an inner edge of the annular mounting body is formed with a first sealing protrusion and a second sealing protrusion, the first sealing protrusion and the second sealing protrusion are arranged at intervals in the axial direction, and the first sealing protrusion is arranged close to the first oil seal structure, and the first sealing protrusion and the second sealing protrusion are both used to elastically abut against the side wall of the piston connecting rod; and, The annular elastic member is sleeved on the outer edge of the annular mounting body to limit the elastic deformation of the annular mounting body in the radial direction of the mounting seat.

7. The oil seal assembly according to claim 1, characterized in that: The through hole comprises a plurality of hole segments arranged in sequence along the axial direction, the diameter of the hole segment located in the middle is larger than the diameter of the hole segment located at the edge, and both end surfaces of the two hole segments located at the edge in the axial direction are bearing surfaces; The first oil seal structure is located in the hole section located in the middle and one of the hole sections located at the edge, and abuts against the corresponding bearing surface; The second oil seal structure is located in the hole section located in the middle and another hole section located at the edge, and abuts against the corresponding bearing surfaces.

8. The oil seal assembly according to claim 7, characterized in that: One of the bearing surfaces is provided with an annular groove, the first oil seal structure is provided with a sealing ring, the sealing ring extends into the groove and abuts against the bottom of the groove; and / or, The second sealing structure includes a second skeleton and a second elastic sealing portion. The second skeleton is arranged in an annular shape, and the outer edge thereof is pressed against the hole wall of the hole section located in the middle. The second skeleton has two oppositely arranged ends, one end of which is pressed against the first oil seal structure, and the other end is bent toward the axial direction of the mounting seat to form a bent section. The second elastic sealing portion is arranged in an annular shape, is arranged on the inner edge of the second skeleton, and is at least partially sleeved on the bent section to form a third sealing protrusion, and the third sealing protrusion is pressed against the other bearing surface.

9. A method for processing an oil seal assembly, based on the oil seal assembly according to any one of claims 1 to 8, characterized in that: The through hole includes a plurality of hole segments arranged in sequence along the axial direction, the diameter of the hole segment located in the middle is larger than the diameter of the hole segment located at the edge, and the two end surfaces of the two hole segments located at the edge in the axial direction are bearing surfaces; the first oil seal structure includes a first skeleton, a first elastic sealing portion and an adjusting ring, the first skeleton is arranged in an annular shape, installed therein with the bearing surface, and the outer edge is pressed against the hole wall of the hole segment located in the middle, the first elastic sealing portion is arranged in an annular shape, arranged at the inner edge of the first skeleton, and is used to elastically abut against the outer side wall of the piston connecting rod, the adjusting ring is elastically arranged, and is arranged at one end of the first skeleton in the axial direction, and ...nular shape, and the first elastic sealing portion is arranged in annular shape, and the first elastic sealing portion is arranged in annular shape, and the first elastic sealing portion is arranged in annular shape, and the first elastic sealing portion is arranged at the inner edge of the first skeleton, and the first elastic sealing portion is arranged in annular shape, and the first elastic sealing portion is arranged in The first elastic sealing portion extends into the pressure chamber, and the adjusting ring and the first elastic sealing portion enclose and define the adjusting chamber; the second sealing structure includes a second frame and a second elastic sealing portion, the second frame is arranged in an annular shape, and the outer edge of the second frame is tightly against the hole wall of the hole section located in the middle, the second frame has two opposite ends, one end of which abuts against the first oil seal structure, and the other end is bent toward the axial direction of the mounting seat to form a bent section, the second elastic sealing portion is arranged in an annular shape, is arranged on the inner edge of the second frame, and is at least partially sleeved on the bent section to form a third sealing convex portion, and the third sealing convex portion abuts against the other bearing surface; The processing method of the oil seal assembly comprises: Provide a cylindrical incoming material, wherein the cylindrical incoming material has a hole section located in the middle and a hole section located at the edge, the diameter of the hole section located in the middle is larger than the diameter of the hole section located at the edge, and the end surface of the hole section located at the edge facing the hole section located in the middle is a bearing surface; Install the first oil seal structure into the hole section located in the middle and the hole section located at the edge, so that the first frame is installed into the hole section located in the middle and pressed against the bearing surface of the hole section located at the edge, and the first elastic seal and the adjustment ring are pressed against the side wall of the hole section located at the edge; Install the second oil seal structure into the hole section located in the middle, so that the second frame is installed into the hole section located in the middle, and the outer edge is pressed against the side wall of the hole section located in the middle, one end is pressed against the first frame, and the second elastic sealing part is partially installed into the hole section located in the middle; The end of the cylindrical incoming material that is axially away from the first oil seal structure is bent toward its own axis to form the mounting seat and obtain another hole segment located at the edge, so that the corresponding bearing surface of the hole segment located at the edge is pressed against the third sealing protrusion.

10. The method for processing an oil seal assembly according to claim 9, characterized in that: The first frame, the first elastic seal and the adjustment ring are integrally formed by vulcanization; and / or, The second frame and the second elastic sealing portion are integrally formed by vulcanization.

Images