A method and device for nitrogen injection of shock absorber

Abstract

The present invention discloses a shock absorber nitrogen injection method and device, comprising the following steps: machining a nitrogen injection hole: machining an axial nitrogen injection hole on the surface of the shock absorber; configuring a sealing bead: selecting a steel ball as a seal and positioning the steel ball at the open end of the nitrogen injection hole; and pressurized nitrogen injection: employing a shock absorber nitrogen injection device to inject nitrogen into the shock absorber using a steel ball. After nitrogen injection, pressure is applied to press the steel ball into the nitrogen injection hole. The technical solution of the present invention utilizes an interference-fit steel ball press-in seal design, utilizing metal plastic deformation to achieve self-sealing during high-pressure nitrogen injection, enabling rapid nitrogen injection and solving the problem of leakage at the nitrogen injection location.

Description

Technical Field

[0001] The present invention relates to the technical field of shock absorbers, and in particular to a method and device for nitrogenating a shock absorber. Background Art

[0002] After long-term use, shock absorbers are prone to nitrogen leakage. Traditional shock absorbers cannot be used after nitrogen leakage and have no use value. For inflatable shock absorbers, the air nozzle of the shock absorber is inflated through an air gun with a pressure gauge. After nitrogen filling, the air nozzle needs to be sealed using argon arc welding or pressing technology, and the operation method is complicated.

[0003] In summary, how to quickly and simply perform nitrogen charging on the shock absorber when the shock absorber is charged with nitrogen is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The technical solution of the present invention to solve the above technical problems is to provide a shock absorber nitrogen injection method, comprising the following steps:

[0005] S1. Processing nitrogen injection holes: Process axial nitrogen injection holes on the surface of the shock absorber;

[0006] S2. Configure the sealing bead: Select a steel ball as the sealing element and position the steel ball at the opening end of the nitrogen injection hole;

[0007] S3. Pressurized nitrogen injection operation: Use the shock absorber nitrogen injection device to inject nitrogen into the shock absorber through the steel ball. After nitrogen injection, apply pressure to press the steel ball into the nitrogen injection hole.

[0008] Furthermore, in step S3, the nitrogen injection pressure is 1.3 to 1.6 MPa.

[0009] Furthermore, the diameter of the nitrogen injection hole is 1.9 mm to 2.2 mm, the hole depth is 1.0 mm to 2.5 mm, the diameter of the steel ball is 2.0 mm to 2.3 mm, and the diameter of the steel ball is 0.1 mm to 0.3 mm larger than the diameter of the corresponding nitrogen injection hole.

[0010] Furthermore, the processing parameters of the nitrogen injection hole in step S1 satisfy any combination of the following conditions:

[0011] a) Hole diameter 2.0mm±0.05mm, hole depth 1.0mm to 2.2mm, steel ball diameter 2.2mm±0.05mm;

[0012] b) Hole diameter 2.2mm±0.05mm, hole depth 1.2mm to 2.5mm, steel ball diameter 2.3mm±0.05mm;

[0013] c) Hole diameter 1.9mm±0.05mm, hole depth 1.0mm to 2.5mm, steel ball diameter 2.0mm±0.05mm.

[0014] To solve the above technical problems, the present invention further provides a shock absorber nitrogen treatment device for implementing the shock absorber nitrogen treatment method as described above, comprising:

[0015] A sleeve having a longitudinal sliding cavity formed therein, a guide slideway formed at the lower portion of the sliding cavity, a limited position space formed at the upper portion, and a downward stop structure provided at the bottom of the limited position space;

[0016] A punch assembly comprising a rod-shaped sliding portion slidingly engaged in the guide slideway and a limiting boss provided at an upper end of the sliding portion; and

[0017] The limiting sleeve is fixed to the top of the sleeve by a threaded connection, and its inner hole is clearance-matched with the punch assembly to limit the axial movement range of the punch assembly;

[0018] Wherein, an air hole is opened on the sleeve and is communicated with the guide slideway.

[0019] Furthermore, the shock absorber nitrogen filling device also includes an air valve assembly, which is arranged in the air hole, and the air valve assembly includes an openable and closable nitrogen channel.

[0020] Furthermore, the diameter of the sliding portion is 7.5 mm to 7.8 mm, the diameter of the guide slideway is 7.6 mm to 8 mm, and the sliding portion and the guide slideway are spaced apart.

[0021] Furthermore, the sliding portion is provided with two spaced apart limiting grooves along the length direction, and a rubber ring is provided in each limiting groove.

[0022] Compared with the existing technology, the present application adopts an interference fit steel ball press-in sealing design, which uses metal plastic deformation to achieve self-sealing during high-pressure nitrogen injection, can quickly fill nitrogen, and solves the problem of leakage at the nitrogen filling position. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0024] Figure 1 This is a flow chart of the steps of the nitrogen treatment method for a shock absorber according to the present invention;

[0025] Figure 2 This is a schematic structural diagram of the shock absorber nitrogen injection device of the present invention;

[0026] Figure 3 Schematic diagram of the structure of the sleeve of the present invention

[0027] Figure 4 It is a structural schematic diagram of the punch assembly of the present invention.

[0028] Description of Figure Numbers:

[0029] 1. Sleeve; 2. Punch assembly; 11. Guide slide; 21. Sliding portion; 12. Limiting space; 22. Limiting boss; 13. Lower stop structure; 3. Limiting sleeve; 14. Air hole. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "several" or "a plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0033] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0034] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] The present invention provides a shock absorber nitrogen filling method and device, aiming to provide a shock absorber nitrogen filling method that can quickly fill nitrogen and solve the problem of leakage at the nitrogen filling position.

[0036] The shock absorber nitrogen treatment device method proposed by the present invention will be described in detail below in a specific embodiment:

[0037] Example 1: In the technical solution of this embodiment, as Figure 1 As shown, a method for nitrogenating a shock absorber comprises the following steps:

[0038] S1. Processing nitrogen injection holes: Process axial nitrogen injection holes on the surface of the shock absorber;

[0039] S2. Configure the sealing bead: Select a steel ball as the sealing element and position the steel ball at the opening end of the nitrogen injection hole;

[0040] S3. Pressurized nitrogen injection operation: Use the shock absorber nitrogen injection device to inject nitrogen into the shock absorber through the steel ball. After nitrogen injection, apply pressure to press the steel ball into the nitrogen injection hole.

[0041] Furthermore, in step S3, the nitrogen injection pressure is 1.3 to 1.6 MPa.

[0042] Furthermore, the diameter of the nitrogen injection hole is 1.9 mm to 2.2 mm, the hole depth is 1.0 mm to 2.5 mm, the diameter of the steel ball is 2.0 mm to 2.3 mm, and the diameter of the steel ball is 0.1 mm to 0.3 mm larger than the diameter of the corresponding nitrogen injection hole.

[0043] Furthermore, the processing parameters of the nitrogen injection hole in step S1 satisfy any combination of the following conditions:

[0044] a) Hole diameter 2.0mm±0.05mm, hole depth 1.0mm to 2.2mm, steel ball diameter 2.2mm±0.05mm;

[0045] b) Hole diameter 2.2mm±0.05mm, hole depth 1.2mm to 2.5mm, steel ball diameter 2.3mm±0.05mm;

[0046] c) Hole diameter 1.9mm±0.05mm, hole depth 1.0mm to 2.5mm, steel ball diameter 2.0mm±0.05mm.

[0047] Example 2: A method for nitrogenating a shock absorber, comprising the following steps:

[0048] S1. Processing nitrogen injection holes: Process axial nitrogen injection holes on the surface of the shock absorber; the diameter of the nitrogen injection holes is 2.0mm±0.05mm, the hole depth is 1.0mm to 2.2mm, and the diameter of the steel ball is 2.2mm±0.05mm;

[0049] S2. Configure the sealing bead: Select a steel ball as the sealing element and position the steel ball at the opening end of the nitrogen injection hole;

[0050] S3. Pressurized nitrogen injection operation: Use the shock absorber nitrogen injection device to inject nitrogen into the shock absorber through steel balls (the nitrogen injection pressure is 1.3 to 1.6MPa). After nitrogen injection, use a fixture to align with the nitrogen injection hole and press the steel ball into the nitrogen injection hole by knocking. The steel ball is contained in the cylinder wall of the shock absorber. There are no special requirements for the impact energy of the knocking and the pressing speed.

[0051] Specifically, after the operation, use putty or glue spray paint to make it the same as the original.

[0052] Example 3: A method for nitrogenating a shock absorber, comprising the following steps:

[0053] S1. Processing nitrogen injection holes: Process axial nitrogen injection holes on the surface of the shock absorber; the diameter of the nitrogen injection holes is 2.2mm±0.05mm, the hole depth is 1.2mm to 2.5mm, and the diameter of the steel ball is 2.3mm±0.05mm;

[0054] S2. Configure the sealing bead: Select a steel ball as the sealing element and position the steel ball at the opening end of the nitrogen injection hole;

[0055] S3. Pressurized nitrogen injection operation: Use the shock absorber nitrogen injection device to inject nitrogen into the shock absorber through steel balls (nitrogen injection pressure is 1.3 to 1.6 MPa). After nitrogen injection, use a fixture to align with the nitrogen injection hole and press the steel ball into the nitrogen injection hole by knocking. The steel ball is contained in the cylinder wall of the shock absorber;

[0056] Specifically, after the operation, use putty or glue spray paint to make it the same as the original.

[0057] Example 4: A method for nitrogenating a shock absorber, comprising the following steps:

[0058] S1. Processing nitrogen injection holes: Process axial nitrogen injection holes on the surface of the shock absorber; the diameter of the nitrogen injection holes is 1.9mm±0.05mm, the hole depth is 1.0mm to 2.5mm, and the diameter of the steel ball is 2.0mm±0.05mm;

[0059] S2. Configure the sealing bead: Select a steel ball as the sealing element and position the steel ball at the opening end of the nitrogen injection hole;

[0060] S3. Pressurized nitrogen injection operation: Use the shock absorber nitrogen injection device to inject nitrogen into the shock absorber through steel balls (nitrogen injection pressure is 1.3 to 1.6 MPa). After nitrogen injection, use a fixture to align with the nitrogen injection hole and press the steel ball into the nitrogen injection hole by knocking. The steel ball is contained in the cylinder wall of the shock absorber;

[0061] Specifically, after the operation, use putty or glue spray paint to make it the same as the original.

[0062] Example 5: A shock absorber nitrogen injection device, such as Figure 2 、 Figure 3 、 Figure 4 As shown, the method for implementing the shock absorber nitrogen treatment as described above includes:

[0063] The sleeve 1 has a longitudinal sliding cavity formed therein, a guide slide 11 formed at the lower portion of the sliding cavity, and a limited space 12 formed at the upper portion, and a downward stop structure 13 provided at the bottom of the limited space 12;

[0064] The punch assembly 2 comprises a rod-shaped sliding portion 21 that is slidably engaged in the guide slideway 11 and a limiting boss 22 provided at the upper end of the sliding portion 21; and

[0065] The limiting sleeve 3 is fixed to the top of the sleeve 1 by a threaded connection, and its inner hole is clearance-matched with the punch assembly 2 to limit the axial movement range of the punch assembly 2;

[0066] The sleeve 1 is provided with an air hole 14 which is communicated with the guide slide 11 .

[0067] Furthermore, the shock absorber nitrogen filling device also includes a gas valve assembly, which is arranged in the gas hole 14, and the gas valve assembly includes a nitrogen channel that can be opened and closed.

[0068] Furthermore, the diameter of the sliding portion 21 is 7.5 mm to 7.8 mm, the diameter of the guide slideway 11 is 7.6 mm to 8 mm, and the sliding portion 21 and the guide slideway 11 are spaced apart.

[0069] Furthermore, the sliding portion 21 is provided with two spaced apart limiting grooves along the length direction, and a rubber ring is provided in each limiting groove. When the punch assembly 2 is placed in the sleeve 1, the limiting groove is located between the air hole 14 and the limiting boss 22, which is used to prevent nitrogen from being discharged through the upper side of the sleeve 1 when nitrogen is filled.

[0070] Working principle: an axial nitrogen injection hole is machined on the surface of the shock absorber, and a steel ball is positioned at the open end of the nitrogen injection hole; the guide slide of the shock absorber nitrogen injection device is aligned with the nitrogen injection hole, and nitrogen is filled into the guide slide 11 through the air valve assembly. The nitrogen moves downward through the nitrogen injection hole to inject nitrogen into the shock absorber. After the injection is completed, the steel ball is pressed into the nitrogen injection hole by striking the punch assembly 2.

[0071] Example 6: A shock absorber nitrogen treatment device, used to implement the shock absorber nitrogen treatment method as described above, comprising:

[0072] The sleeve 1 has a longitudinal sliding cavity formed therein, a guide slide 11 formed at the lower portion of the sliding cavity, and a limited space 12 formed at the upper portion, and a downward stop structure 13 provided at the bottom of the limited space 12;

[0073] The punch assembly 2 comprises a rod-shaped sliding portion 21 that is slidably engaged in the guide slideway 11 and a limiting boss 22 provided at the upper end of the sliding portion 21; and

[0074] The limiting sleeve 3 is fixed to the top of the sleeve 1 by a threaded connection, and its inner hole is clearance-matched with the punch assembly 2 to limit the axial movement range of the punch assembly 2;

[0075] The sleeve 1 is provided with an air hole 14 which is communicated with the guide slide 11 .

[0076] Furthermore, the shock absorber nitrogen filling device also includes a gas valve assembly, which is arranged in the gas hole 14, and the gas valve assembly includes a nitrogen channel that can be opened and closed.

[0077] Furthermore, the diameter of the sliding portion 21 is 7.6 mm, the diameter of the guide slide 11 is 8 mm, and the sliding portion 21 is spaced apart from the guide slide 11; the diameter of the limiting boss 22 is 10.6 mm, the diameter of the limiting space 12 is 11 mm, and the end of the sliding portion 21 away from the limiting boss 22 is a tapered cone shape.

[0078] Furthermore, the sliding portion 21 is provided with two spaced apart limiting grooves, and a rubber ring is disposed in each limiting groove.

[0079] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for nitrogenating a shock absorber, characterized in that: The following steps are involved: S1. Processing nitrogen injection holes: Process axial nitrogen injection holes on the surface of the shock absorber; S2. Configure the sealing bead: Select a steel ball as the sealing element and position the steel ball at the opening end of the nitrogen injection hole; S3. Pressurized nitrogen injection operation: Use the shock absorber nitrogen injection device to inject nitrogen into the shock absorber through the steel ball. After nitrogen injection, press the steel ball into the nitrogen injection hole with an interference fit steel ball press-in seal design; The shock absorber nitrogen filling device includes: a sleeve, a longitudinal sliding cavity is formed inside the sleeve, a guide slide is formed at the lower part of the sliding cavity, a limited space is formed at the upper part, and a downward stop structure is provided at the bottom of the limited space; A punch assembly comprising a rod-shaped sliding portion slidingly engaged in the guide slideway and a limiting boss provided at an upper end of the sliding portion; and The limiting sleeve is fixed to the top of the sleeve by a threaded connection, and its inner hole is clearance-matched with the punch assembly to limit the axial movement range of the punch assembly; Wherein, the sleeve is provided with an air hole, which is connected with the guide slideway; The gas valve assembly is arranged in the gas hole, and the gas valve assembly includes a nitrogen channel that can be opened and closed.

2. The shock absorber nitrogen treatment method according to claim 1, characterized in that: The nitrogen injection pressure is 1.3MPa-1.6MPa.

3. The shock absorber nitrogen treatment method according to claim 1, characterized in that: The diameter of the nitrogen injection hole is 1.9 mm to 2.2 mm, the hole depth is 1.0 mm to 2.5 mm, the diameter of the steel ball is 2.0 mm to 2.3 mm, and the diameter of the steel ball is 0.1 mm to 0.3 mm larger than the diameter of the corresponding nitrogen injection hole.

4. The shock absorber nitrogen treatment method according to claim 1, characterized in that: The processing parameters of the nitrogen injection hole in step S1 meet any combination of the following conditions: a) Hole diameter 2.0mm±0.05mm, hole depth 1.0mm-2.2mm, steel ball diameter 2.2mm±0.05mm; b) Hole diameter 2.2mm±0.05mm, hole depth 1.2mm-2.5mm, steel ball diameter 2.3mm±0.05mm; c) Hole diameter 1.9mm±0.05mm, hole depth 1.0mm-2.5mm, steel ball diameter 2.0mm±0.05mm.

5. A shock absorber nitrogen treatment device, used for implementing the shock absorber nitrogen treatment method according to any one of claims 1 to 4.

6. The shock absorber nitrogen treatment device according to claim 5, characterized in that: The diameter of the sliding portion is 7.5 mm to 7.8 mm, the diameter of the guide slideway is 7.6 mm to 8 mm, and the sliding portion and the guide slideway are spaced apart.

7. The shock absorber nitrogen treatment device according to claim 5, characterized in that: The sliding portion is provided with two spaced apart limiting grooves along the length direction, and a rubber ring is arranged in each limiting groove.

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