Inflatable double-tube shock absorber and its maintenance method

Abstract

An inflatable double-tube shock absorber includes a liquid storage cylinder and a working cylinder; a connecting piece is provided on the liquid storage cylinder, and an inflation and shock absorber oil replacement assembly is installed on the connecting piece; an elastic sealing component and an inflation hole are provided inside, and the elastic sealing component includes a flexible sealing pad, a spring sheet and an inner bolt; the inner bolt presses and fixes the spring sheet and the flexible sealing pad; the outlet of the inflation hole is covered by the flexible sealing pad to form a seal, and when inflating, the air pressure in the inflation hole rises to cause the spring sheet to undergo elastic deformation, and the gas enters the cavity between the liquid storage cylinder and the working cylinder. After the inflation is completed, the spring sheet is reset, and the flexible sealing pad restores the seal of the inflation hole. The present invention sets an inflation and shock absorber oil replacement assembly on the connecting piece, and the inflation process will not damage the sealing structure and does not require the use of inflation rivets; when impurities appear inside the shock absorber oil and the oil needs to be replaced, it is only necessary to remove the outer tube cover, and there is no need to disassemble the entire shock absorber, thereby avoiding damage and failure of the shock absorber.

Description

Technical Field

[0001] The invention relates to the field of shock absorbers, and in particular to an inflatable double-tube shock absorber and a maintenance method thereof. Background Art

[0002] As one of the important components of the automobile chassis suspension system, the shock absorber determines the ride comfort of the automobile to a large extent. The inflatable double-tube shock absorber is a kind of shock absorber widely used in automobiles.

[0003] The pneumatic double-tube shock absorber consists of a liquid storage cylinder, a working cylinder, a piston, a bottom valve, a guide, an oil seal, etc. During the manufacturing process of the shock absorber, it is necessary to fill the shock absorber cylinder with gas. There are two traditional methods. One is to insert a needle to inflate the gas at the assembly position of the sealing ring. This method damages the oil seal and easily brings in iron filings and impurities during inflation, causing the shock absorber to leak oil, gas, and make abnormal noises, which will affect the working performance and service life of the shock absorber. The other method is to set up special pneumatic rivets, which have high requirements on the precision of the pneumatic rivets and also have a greater risk of gas leakage.

[0004] In addition, the test found that after long-term use, impurities will be introduced into the oil of the pneumatic twin-tube shock absorber, causing abnormal noise during operation and even affecting the shock absorption performance. Long-term operation of the oil containing impurities may also cause problems such as failure of the shock absorber oil seal and wear of the internal parts of the shock absorber. The structure of the existing pneumatic twin-tube shock absorber determines that it is impossible to replace the oil, and the problem can only be solved by replacing a new shock absorber. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides an inflatable double-tube shock absorber. The present invention provides a connector on the liquid storage cylinder and installs a specific inflation and shock absorber oil replacement assembly on the connector, so that the sealing structure is not damaged during the inflation process, and no inflation rivets are used, so the sealing is good and the reliability is high, so that the shock absorber has a low risk of air leakage and a long service life. At the same time, it is easy to inflate and has a simple structure and is easy to process. In addition, the inflatable double-tube shock absorber of the present invention can replace the shock absorber oil to keep the shock absorber oil clean and avoid negative effects caused by impurities in the oil. Correspondingly, the present invention also provides a maintenance method for the inflatable double-tube shock absorber. By performing reasonable maintenance on the inflatable double-tube shock absorber, the problems of abnormal noise and reduced shock absorption performance of the shock absorber can be avoided, and the service life of the shock absorber can be extended.

[0006] For the pneumatic double-tube shock absorber, the present invention provides the following technical solutions:

[0007] An inflatable double-tube shock absorber comprises a liquid storage cylinder and a working cylinder; a connecting piece is provided on the liquid storage cylinder, and an inflatable and shock absorber oil replacement assembly is installed on the connecting piece; the inflatable and shock absorber oil replacement assembly comprises an outer tube and an outer tube cover, the outer tube and the connecting piece are connected and sealed; the outer tube cover and the outer tube are detachably connected and sealed; an inflatable hole is provided on the outer tube cover; an elastic sealing assembly is provided on the inner side of the outer tube cover, and the elastic sealing assembly comprises a flexible sealing pad, a spring sheet and an inner bolt; a There is a first threaded hole for installing an elastic sealing component, and the flexible sealing gasket and the spring sheet are provided with holes for the inner bolts to pass through. The inner bolts pass through the holes on the spring sheet and the flexible sealing gasket in sequence and are screwed to the first threaded hole to press and fix the spring sheet and the flexible sealing gasket; the outlet of the inflation hole is covered by the flexible sealing gasket to form a seal. When inflating, the air pressure in the inflation hole rises to cause the spring sheet to deform elastically, and the gas enters the cavity between the liquid storage barrel and the working cylinder. After the inflation is completed, the spring sheet is reset, and the flexible sealing gasket resumes sealing the inflation hole.

[0008] Compared with the prior art, the present invention provides a connecting piece on the liquid storage cylinder, and installs a specific inflation and shock absorber oil replacement assembly on the connecting piece. During inflation, the high-pressure gas in the inflation channel causes the spring sheet to undergo elastic deformation, and the gas in the inflation hole enters the cavity between the liquid storage cylinder and the working cylinder. After the inflation is completed, the spring sheet is reset, and the flexible sealing pad forms a seal for the inflation hole with good sealing performance. The inflation process will not damage the sealing structure and no inflation rivets are used, so the reliability is high, which reduces the risk of air leakage of the shock absorber and prolongs its service life. At the same time, it has the characteristics of simple structure and easy processing, which is conducive to industrial promotion. In addition, the outer tube cover is detachable, so that the outer tube cover can be removed to pour out the old shock absorber oil, and then new shock absorber oil can be loaded to keep the oil clean and avoid negative effects caused by impurities in the oil.

[0009] As an optimization, in the aforementioned inflatable double-tube shock absorber, the inlet of the inflatable hole is processed with an internal thread to form a second threaded hole, an external bolt is installed in the second threaded hole, and a sealing ring is provided between the head of the external bolt and the outer tube cover to form a seal. As a result, the inlet of the inflatable hole is also sealed, further reducing the risk of air leakage and improving the reliability of the shock absorber; and the above structure is easy to process, which is conducive to industrial implementation.

[0010] As an optimization, in the aforementioned pneumatic double-tube shock absorber, the second threaded hole is a countersunk structure. With this structure, the bolt head is buried inside the outer tube cover, which is more beautiful and does not increase the external dimensions.

[0011] As an optimization, in the aforementioned pneumatic double-tube shock absorber, a sealing pressure ring is provided at the inner end of the outer tube, and correspondingly, an annular groove is provided on the connecting piece, a sealing ring is provided in the annular groove, and the sealing pressure ring cooperates with the annular groove and presses the sealing ring to achieve sealing. With this structure, the sealing pressure ring cooperates with the annular groove to press the sealing ring, so that the sealing effect is further improved.

[0012] As an optimization, in the aforementioned inflatable double-tube shock absorber, the outer tube cover is connected to the outer tube by threads and sealed by a sealing ring. This structure is easy to process and assemble, and when the elastic sealing component is damaged, it is convenient to replace.

[0013] As an optimization, in the aforementioned pneumatic double-tube shock absorber, the outer circumference of the outer tube is processed with an external thread, and correspondingly, the inner circumference of the connecting piece is processed with a matching internal thread, and the outer tube and the connecting piece are connected by threads. The outer tube and the connecting piece are connected by threads, which is easy to process and assemble.

[0014] As an optimization, in the aforementioned pneumatic double-tube shock absorber, a group of connection holes for installing tooling is provided on the outer end surface of the outer tube cover. With this structure, the outer tube cover is more convenient to disassemble.

[0015] Regarding the maintenance method, the present invention provides the following technical solutions:

[0016] A maintenance method for a pneumatic twin-tube shock absorber is applicable to the pneumatic twin-tube shock absorber of the present invention; the maintenance method includes an oil replacement item.

[0017] Furthermore, the oil replacement project is performed regularly or at a fixed mileage.

[0018] Furthermore, the maintenance process of the oil replacement project is as follows: remove the outer tube cover, pour out the old shock absorber oil, add new shock absorber oil, and then reinstall the outer tube cover on the outer tube to complete the shock absorber oil replacement; after the oil replacement is completed, re-inflate.

[0019] The maintenance method of the pneumatic double-tube shock absorber of the present invention is applicable to the above-mentioned pneumatic double-tube shock absorber of the present invention, including the shock absorber oil replacement project. By timely replacing the shock absorber oil, the oil is kept clean. Compared with the prior art, the problems of abnormal noise and reduced shock absorption performance caused by impurities in the oil can be avoided, and the problems of oil seal failure and parts wear caused by long-term operation of the oil containing impurities can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a cross-sectional view of the pneumatic double-tube shock absorber of the present invention;

[0021] Figure 2It is a cross-sectional view of the inflation and shock absorber oil change assembly of the present invention.

[0022] The markings in the accompanying drawings are: 1-liquid storage cylinder; 2-working cylinder; 3-connecting piece; 4-inflating and shock absorber oil replacement assembly, 41-outer tube, 411-sealing pressure ring, 42-outer tube cover, 421-inflating hole, 422-outer bolt, 423-connecting hole, 43-elastic sealing assembly, 431-flexible sealing pad, 432-spring leaf, 433-inner bolt. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but is not intended to be limiting of the present invention. In the following embodiments, all that is not described in detail is conventional technical means or technical common sense in the art.

[0024] Example (see Figure 1-2 ):

[0025] An inflatable double-tube shock absorber comprises a liquid storage cylinder 1 and a working cylinder 2; the liquid storage cylinder 1 is provided with a connecting piece 3, and an inflatable and shock absorber oil replacement assembly 4 is installed on the connecting piece 3; the inflatable and shock absorber oil replacement assembly 4 comprises an outer tube 41 and an outer tube sealing cover 42, the outer tube 41 and the connecting piece 3 are connected and sealed; the outer tube sealing cover 42 and the outer tube 41 are detachably connected and sealed; an inflatable hole 421 is provided on the outer tube sealing cover 42; an elastic sealing assembly 43 is provided on the inner side of the outer tube sealing cover 42, and the elastic sealing assembly 43 comprises a flexible sealing pad 431, a spring sheet 432 and an inner bolt 433; the inner side of the outer tube sealing cover 42 is provided with a spring for installing a spring. The first threaded hole of the elastic sealing component 43, the flexible sealing gasket 431 and the spring sheet 432 are provided with holes for the inner bolt 433 to pass through, and the inner bolt 433 passes through the holes on the spring sheet 432 and the flexible sealing gasket 431 in sequence and is screwed to the first threaded hole to press and fix the spring sheet 432 and the flexible sealing gasket 431; the outlet of the inflation hole 421 is covered by the flexible sealing gasket 431 to form a seal, and when inflating, the air pressure in the inflation hole 421 rises to cause the spring sheet 432 to be elastically deformed, and the gas enters the cavity between the liquid storage barrel 1 and the working cylinder 2. After the inflation is completed, the spring sheet 432 is reset, and the flexible sealing gasket 431 restores the seal of the inflation hole 421.

[0026] When the oil needs to be replaced, the outer tube cover 42 is removed, the old oil is poured out, and new oil is loaded, and then the air is refilled. When inflating, the air pressure in the inflation hole 421 rises, the spring sheet 432 is elastically deformed, and the flexible sealing pad 431 turns inward with the spring sheet 432, and the gas enters the cavity between the liquid storage tube 1 and the working cylinder 2. After the inflation is completed, the spring sheet 432 is reset, and the flexible sealing pad 431 resumes sealing the inflation hole 421.

[0027] In this embodiment, the inlet of the inflation hole 421 is processed with an internal thread to form a second threaded hole, an external bolt 422 is installed in the second threaded hole, and a sealing ring is provided between the head of the external bolt 422 and the outer tube cover 42 to form a seal.

[0028] In this embodiment, the second threaded hole is a countersunk hole structure.

[0029] In this embodiment, a sealing pressure ring 411 is provided at the inner end of the outer tube 41. Correspondingly, an annular groove is provided on the connecting member 3. A sealing ring is provided in the annular groove. The sealing pressure ring 411 cooperates with the annular groove and presses the sealing ring to achieve sealing.

[0030] In this embodiment, the outer tube cover 42 is connected to the outer tube 41 through threads and is sealed with a sealing ring.

[0031] In this embodiment, the outer circumference of the outer tube 41 is processed with external threads, and correspondingly, the inner circumference of the connecting member 3 is processed with matching internal threads, and the outer tube 41 and the connecting member 3 are connected by threads.

[0032] In this embodiment, a group of connection holes 423 for installing a tool are provided on the outer end surface of the outer tube cover 42. When the outer tube cover 42 needs to be disassembled, the pin on the special tool is inserted into the connection hole 423, and then the outer tube cover 42 can be disassembled or installed using a wrench (the special tool has a structure that cooperates with the wrench). The connection holes 423 make it easier to disassemble and assemble the outer tube cover 42, and the connection holes are easy to process, which is conducive to controlling costs.

[0033] In the above embodiment, the method for maintaining the pneumatic double-tube shock absorber is as follows: the maintenance method includes an oil replacement item; the oil replacement item is performed regularly or at a fixed mileage; the maintenance process of the oil replacement item is as follows: remove the outer tube cover 42, pour out the old shock absorber oil, add new shock absorber oil, and then reinstall the outer tube cover 42 on the outer tube 41 to complete the replacement of the shock absorber oil; after the oil replacement is completed, re-inflate.

[0034] Of course, the maintenance method of this application is only a guide, and users can also change the oil in advance or delay according to actual conditions.

[0035] The above general description of the invention involved in this application and the description of its specific implementation methods should not be understood as limiting the technical solutions of the invention. Based on the disclosure of this application, those skilled in the art can, without violating the constituent elements of the invention involved, add, reduce or combine the disclosed technical features in the above general description or / and specific implementation methods (including examples) to form other technical solutions within the scope of protection of this application.

Claims

1. A pneumatic double-tube shock absorber, comprising a liquid storage cylinder (1) and a working cylinder (2); characterized in that: The liquid storage cylinder (1) is provided with a connecting piece (3), and an inflation and shock absorber oil replacement assembly (4) is installed on the connecting piece (3); the inflation and shock absorber oil replacement assembly (4) comprises an outer tube (41) and an outer tube sealing cover (42), and the outer tube (41) and the connecting piece (3) are connected and sealed; the outer tube sealing cover (42) and the outer tube (41) are detachably connected and sealed; an inflation hole (421) is provided on the outer tube sealing cover (42); an elastic sealing assembly (43) is provided on the inner side of the outer tube sealing cover (42), and the elastic sealing assembly (43) comprises a flexible sealing pad (431), a spring sheet (432) and an inner bolt (433); a spring for installing the elastic sealing assembly (43) is provided on the inner side of the outer tube sealing cover (42). 3), the flexible sealing pad (431) and the spring sheet (432) are provided with holes for the inner bolt (433) to pass through, the inner bolt (433) passes through the holes on the spring sheet (432) and the flexible sealing pad (431) in sequence and is screwed to the first threaded hole to press and fix the spring sheet (432) and the flexible sealing pad (431); the outlet of the inflation hole (421) is covered by the flexible sealing pad (431) to form a seal, when inflation occurs, the air pressure in the inflation hole (421) rises to cause the spring sheet (432) to undergo elastic deformation, and the gas enters the cavity between the liquid storage barrel (1) and the working cylinder (2), after inflation is completed, the spring sheet (432) is reset, and the flexible sealing pad (431) resumes sealing the inflation hole (421).

2. The pneumatic double-tube shock absorber according to claim 1, characterized in that: An internal thread is processed at the inlet of the inflation hole (421) to form a second threaded hole, an external bolt (422) is installed in the second threaded hole, and a sealing ring is provided between the head of the external bolt (422) and the outer tube cover (42) to form a seal.

3. The pneumatic double-tube shock absorber according to claim 2, characterized in that: The second threaded hole is a countersunk hole structure.

4. The pneumatic double-tube shock absorber according to claim 3, characterized in that: The inner end of the outer tube (41) is provided with a sealing pressure ring (411), and correspondingly, the connecting piece (3) is provided with an annular groove, in which a sealing ring is provided, and the sealing pressure ring (411) cooperates with the annular groove and presses the sealing ring to achieve sealing.

5. The pneumatic double-tube shock absorber according to claim 4, characterized in that: The outer tube sealing cover (42) is connected to the outer tube (41) via threads and is sealed with a sealing ring.

6. The pneumatic double-tube shock absorber according to claim 1, characterized in that: The outer circumferential surface of the outer tube (41) is processed with an external thread, and correspondingly, the inner circumferential surface of the connecting piece (3) is processed with a matching internal thread, and the outer tube (41) and the connecting piece (3) are connected via threads.

7. The pneumatic double-tube shock absorber according to claim 1, characterized in that: A group of connection holes (423) for installing tooling are provided on the outer end surface of the outer tube cover (42).

8. The maintenance method of the pneumatic twin-tube shock absorber is characterized by: The maintenance method is applicable to the pneumatic double-tube shock absorber of any one of claims 1 to 7; the maintenance method includes an oil replacement item.

9. The maintenance method of the pneumatic twin-tube shock absorber according to claim 8, characterized in that: The oil replacement item is performed regularly or at a certain mileage.

10. The maintenance method of the pneumatic twin-tube shock absorber according to claim 8 or 9, characterized in that: The maintenance process of the oil replacement project is as follows: remove the outer tube cover (42), pour out the old shock absorber oil, add new shock absorber oil, and then reinstall the outer tube cover (42) on the outer tube (41) to complete the shock absorber oil replacement; after the oil replacement is completed, re-inflate.

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