High-performance piston structure of gas spring and special riveting integrated machine thereof

Abstract

This invention discloses a high-performance gas spring piston structure and its dedicated riveting machine, relating to the field of gas spring piston technology. The high-performance gas spring piston structure includes a piston rod and a contraction section disposed at one end of the piston rod. The end of the contraction section connected to the piston rod has a deformation limiting groove, which is integrally cast with the piston rod and has a diameter smaller than that of the piston rod. This invention utilizes the mutual cooperation between the contraction section, the deformation component, the piston, and the riveting section. Deformation of the riveting section can drive the piston to move and the deformation component to deform. As the deformation component deforms, the piston moves axially towards the piston rod along the contraction section. This piston movement exposes more of the contraction section, allowing more of it to be riveted into a riveted section, thus enhancing the riveting strength and preventing piston slippage.

Description

Technical Field

[0001] This invention relates to the field of gas spring piston structure technology, and in particular to a high-performance gas spring piston structure and its dedicated riveting machine. Background Technology

[0002] Gas springs, as elastic elements capable of providing support, cushioning, braking, height adjustment, and angle adjustment, are widely used in various fields such as machinery manufacturing, automotive industry, furniture and home appliances, and aerospace. Their performance directly affects the operational stability and service life of the entire equipment. The piston structure is one of the core components of a gas spring, mainly used to separate the gas chambers within the gas spring cylinder and transmit the extension and retraction force of the piston rod. Simultaneously, it must ensure the sealing of the gas within the cylinder. Therefore, the connection strength, sealing performance, and structural stability of the piston structure are key factors determining the high performance of the gas spring.

[0003] Currently, the piston structure of existing gas springs typically uses direct riveting between the piston rod and the piston for fixation. Riveting is the most widely used connection method in the industry due to its ease of operation, low cost, and strong adaptability. However, existing riveted piston structures still have several drawbacks in practical use: First, the piston rod and piston are usually fixed only by a single riveting surface. Insufficient riveting strength leads to poor riveting strength, making the piston prone to slippage after long-term use, seriously affecting the service life and safety of the gas spring. Second, insufficient riveting leaves a gap between the piston rod and piston, which can cause wear and wobble after long-term operation, and in more serious cases, poor sealing.

[0004] To address these issues, this invention proposes a high-performance gas spring piston structure and its dedicated riveting machine. Summary of the Invention

[0005] The purpose of this invention is to provide a high-performance gas spring piston structure and its dedicated riveting machine to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-performance gas spring piston structure, including a piston rod and a contraction part disposed at one end of the piston rod, wherein the end of the contraction part connected to the piston rod is provided with a deformation limiting groove, which is integrally cast with the piston rod and its diameter is smaller than the diameter of the piston rod.

[0007] Deformable component, which is fitted outside the contraction section;

[0008] The piston is sleeved outside the contraction part and located on the top of the deformable part. An extrusion groove is provided on the inner wall of the side away from the deformable part, and a mating groove that mates with the deformable part is provided on the side of the piston close to the deformable part.

[0009] The riveted part is formed by riveting the end of the contraction part away from the piston rod. The deformation of the riveted part can push the piston to move and deform the deformable part. The deformation of the deformable part makes the deformable part connected to the piston and piston rod in a limiting manner, and at the same time enhances the sealing between the piston and piston rod. The movement of the piston exposes more of the contraction part of the piston, and more of the contraction part can be riveted into the riveted part.

[0010] Preferably, a sealing groove is provided on the middle side wall of the piston, and an elastic sealing ring is provided in the sealing groove.

[0011] Preferably, the deformable component includes a hard ring, the hard ring having an annular conical hard portion located in a mating groove on the side near the piston, the annular conical hard portion having a deformable horn portion on the side near the piston, the hard ring having an annular groove on the side away from the piston, and the inner wall of the annular groove having a conical deformable portion that mates with the deformable limiting groove to form a limiting connection.

[0012] Preferably, the mating groove includes a conical groove that mates with the annular conical hard part, and the top of the conical groove is provided with an arc-shaped guide and limiting groove that mates with the deformable horn part.

[0013] Preferably, the extrusion groove is conical.

[0014] A dedicated riveting machine for high-performance piston structures with gas springs includes a fixed base and a column, wherein the column is disposed on the top of the fixed base;

[0015] The drive mechanism is located at the top of the column;

[0016] The clamping mechanism is located in the middle of the column and below the drive mechanism, and it can clamp the piston rod.

[0017] The pushing mechanism, wherein the column is disposed on the top of the fixed base, is capable of pushing the piston rod with the retractable part to move into the clamping mechanism;

[0018] The riveting head is located at the bottom of the output shaft of the drive mechanism, and is driven by the drive mechanism to rotate and move up and down.

[0019] Preferably, the riveting head includes a connector body, with a threaded hole at the top for engaging with the drive mechanism, and a receiving groove at the bottom. The receiving groove is connected to the threaded hole through a connecting hole. The receiving groove is provided with a chuck, a flat bearing, a double-row ball bearing, and a retaining spring from top to bottom. A retaining groove is provided at the retaining spring corresponding to the receiving groove.

[0020] The rivet head is fitted inside the flat bearing and the double-row ball bearing, and one end of it is engaged with the chuck in the receiving groove.

[0021] Preferably, the top sidewall of the rivet head is provided with a snap-fit ​​groove that engages with the chuck.

[0022] Preferably, the chuck includes a cylinder, the outer wall of which has a U-shaped groove, and the bottom of which has a groove penetrating the U-shaped groove, and the U-shaped groove has an elastic snap-fit ​​component.

[0023] Preferably, the elastic snap-fit ​​element is U-shaped.

[0024] The present invention has at least the following beneficial effects:

[0025] 1. This invention utilizes the interplay between the contraction section, the deformable component, the piston, and the riveting section. The deformation of the riveting section drives the piston to move, and the deformation of the deformable component also causes deformation. The conical deformation portion of the deformable component embeds itself into the deformation limiting groove, thereby locking the piston and piston rod together. Simultaneously, the flared deformation portion deforms under the pressure and guidance of the arc-shaped guide limiting groove. This creates a limiting connection between the deformable component and the piston, preventing the piston from sliding relative to the piston rod, thus avoiding inner wall wear and poor sealing.

[0026] 2. Through the mutual cooperation between the contraction part, the deformation part, the piston and the riveting part, etc., after the deformation of the horn part, the sealing between the piston and the piston rod can be further enhanced due to the cooperation between the arc-shaped guide limiting groove and the deformation horn part.

[0027] 3. The present invention utilizes the cooperation between the contraction part, the deformation part, the piston, and the riveting part. The deformation of the riveting part can drive the piston to move and the deformation part to deform. As the deformation part deforms, the piston will move along the piston rod along the axis of the contraction part. The movement of the piston exposes more of the contraction part of the piston, which can be riveted into a riveting part to enhance the riveting strength and prevent the piston from slipping. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the riveting machine according to Embodiment 2 of the present invention.

[0029] Figure 2 This is a schematic diagram of the connection between the riveting head and the column in Embodiment 2 of the present invention.

[0030] Figure 3 This is a cross-sectional schematic diagram of the riveting head of the present invention.

[0031] Figure 4 This is a schematic cross-sectional view of the chuck of the present invention when it is placed horizontally.

[0032] Figure 5 This is a schematic vertical sectional view of the chuck of the present invention.

[0033] Figure 6 This is a schematic diagram of the explosion of the gas spring component of the present invention.

[0034] Figure 7 This is a schematic diagram of the overall structure before riveting in Embodiment 1 of the present invention.

[0035] Figure 8 This is a schematic diagram of the overall structure after riveting according to Embodiment 1 of the present invention.

[0036] The attached figures are labeled as follows: 1. Piston rod; 2. Contraction section; 21. Deformation limiting groove; 3. Deformation component; 31. Hard ring; 32. Annular conical hard part; 33. Deformation flared part; 34. Annular groove; 35. Conical deformation part; 4. Piston; 42. Mating groove; 421. Conical groove; 422. Arc-shaped guide limiting groove; 43. Sealing groove; 44. Elastic sealing ring; 5. Extrusion groove; 6. Riveting part; 7. Fixing element. 8. Base; 9. Column; 10. Drive mechanism; 11. Clamping mechanism; 12. Pushing mechanism; 13. Riveting head; 14. Connector body; 15. Receiving groove; 16. Chuck; 17. Cylinder; 18. U-shaped groove; 19. Groove; 20. Elastic snap-fit ​​component; 21. Flat bearing; 22. Double row ball bearing; 23. Snap ring; 24. Snap groove; 25. Riveting head. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Example 1

[0039] Please see Figures 7 to 8 As shown, a high-performance gas spring piston structure includes a piston rod 1 and a contraction part 2, which is disposed at one end of the piston rod 1. The end of the contraction part 2 connected to the piston rod 1 is provided with a deformation limiting groove 21. The contraction part 2 is integrally cast with the piston rod 1, and its diameter is smaller than the diameter of the piston rod 1. The present invention ensures the basic connection strength by integrally casting the contraction part 2 with the piston rod 1.

[0040] Deformable component 3 is sleeved outside the contraction part 2.

[0041] Piston 4 is sleeved outside the contraction part 2 and located on the top of the deformable part 3. An extrusion groove 5 is provided on the inner side wall of the side away from the deformable part 3, and a mating groove 42 that mates with the deformable part 3 is provided on the side of the piston 4 close to the deformable part 3.

[0042] The riveting part 6 is formed by riveting the end of the contraction part 2 away from the piston rod 1. Deformation of the riveting part 6 can push the piston 4 to move and deform the deformable part 3. The deformation of the deformable part 3 limits its connection with the piston 4 and piston rod 1, while also enhancing the seal between the piston 4 and piston rod 1. The movement of the piston 4 exposes more of the contraction part 2, allowing more of the contraction part 2 to be riveted into the riveting part 6, thus increasing the riveting strength and preventing the piston 4 from slipping. During assembly, an external riveting power source moves downwards to press and rivet the top of the contraction part 2. As the riveting process proceeds, the material of the contraction part 2 deforms under pressure and extends outwards to form the riveting part 6. The axial compressive force generated during the formation of the riveting part 6 directly drives the piston 4 to move axially along the contraction part 2 towards the piston rod 1. The movement of the piston 4 further drives the mating groove 42 at its bottom to compress the deformable part 3. The deformable component 3 deforms under pressure, causing its conical deformable part 35 to embed into the deformable limiting groove 21. This locks the piston 4 and piston rod 1 together, significantly enhancing sealing and resistance to detachment. Furthermore, this structure requires no additional manufacturing steps; it can be completed with a single riveting operation.

[0043] Furthermore, a sealing groove 43 is provided on the middle side wall of the piston 4, and an elastic sealing ring 44 is provided in the sealing groove 43. The elastic sealing ring 44 of the present invention can be an "O" ring or a star ring, etc.

[0044] Furthermore, the deformable component 3 includes a rigid ring 31. The rigid ring 31 has an annular conical rigid portion 32 located within the mating groove 42 on the side near the piston 4. The annular conical rigid portion 32 has a deformable horn portion 33 on the side near the piston 4. An annular groove 34 is formed on the side of the rigid ring 31 away from the piston 4. The inner wall of the annular groove 34 has a conical deformable portion 35 that mates with the deformable limiting groove 21 to form a limiting connection. When the piston 4 moves downwards, the mating groove 42 compresses the deformable horn portion 33, causing it to deform under the compression and guidance of the arc-shaped guide limiting groove 422. This forms a limiting connection between the deformable component 3 and the piston 4. Simultaneously, as compression continues, pressure is transmitted to the annular conical rigid portion 32 and the rigid ring 31, further driving the conical deformable portion 35 to deform, causing it to wedge into the deformable limiting groove 21 on the contraction portion 2. The deformable part 3 and the piston rod 1 form a limiting connection, which ultimately realizes the limiting connection between the piston rod 1 and the piston 4, and improves the overall connection effect.

[0045] Furthermore, the mating groove 42 includes a conical groove 421 that mates with the annular conical hard part 32, and an arc-shaped guide and limiting groove 422 that mates with the deformable horn part 33 is provided at the top of the conical groove 421.

[0046] Furthermore, the extrusion groove 5 is conical. In this invention, the expanding volume of the riveting part 6 during the riveting process compresses the extrusion groove 5, driving the piston 4 to move downward.

[0047] During manufacturing, the deformable part 3 and piston 4 are first sequentially fitted onto the contraction part 2. Then, the piston rod 1 is fixed. The external riveting power source is then controlled to move downwards and press and rivet the top of the contraction part 2. As the riveting process proceeds, the top of the contraction part 2 is deformed under pressure and extends outwards to form the riveting part 6. The extrusion force generated by the riveting part 6 during its formation process presses the piston 4 and directly drives the piston 4 to move. At the same time, the mating groove 42 of the piston 4 will press the deformable part 3. After being pressed, the deformable part 3 deforms. On the one hand, the conical deformable part 35 deforms and embeds into the deformable limiting groove 21, thereby locking the piston 4 and piston rod 1 together. On the other hand, the deformable horn part 33 deforms under the extrusion and guidance of the arc-shaped guide limiting groove 422. The deformable part 3 and the piston 4 form a limiting connection. After the deformable horn part 33 is deformed, the sealing between the piston 4 and the piston rod 1 is enhanced due to the cooperation between the arc-shaped guide limiting groove 422 and the deformable horn part 33. Finally, the deformable part 3 is limited to the piston 4 and the piston rod 1. As the deformable part 3 deforms, the piston 4 will move axially towards the piston rod 1 along the contraction part 2. The movement of the piston 4 exposes more of the contraction part 2 of the piston 4, which can be riveted into the riveting part 6 to enhance the riveting strength and prevent the piston 4 from slipping.

[0048] Example 2

[0049] Please see Figures 1 to 6 As shown, this invention also discloses a dedicated riveting machine for high-performance gas spring piston structures, including a fixed base 7 and a column 8, with the column 8 positioned at the top of the fixed base 7; a drive mechanism 9 positioned at the top of the column 8; a clamping mechanism 10 positioned in the middle of the column 8 and below the drive mechanism 9, capable of clamping the piston rod 1; a pushing mechanism 11, with the column 8 positioned at the top of the fixed base 7, capable of pushing the piston rod 1 with the contraction section 2 into the clamping mechanism 10; and a riveting head 12 positioned at the bottom of the output shaft of the drive mechanism 9, driven by the drive mechanism 9 to rotate and move up and down. At the start of operation, the pushing mechanism 11 drives the piston rod 1 to rise into the working position, and then the clamping mechanism 10 clamps and fixes the piston rod 1. Next, the drive mechanism 9 drives the riveting head 12 to rotate at high speed while slowly pressing down. After the riveting head 12 contacts the contraction section 2, it drives the contraction section 2 to deform into a riveting section 6, ultimately fastening the piston 4 and other components to the piston rod 1.

[0050] Furthermore, the riveting head 12 includes a connector body 121, which has a threaded hole at its top that mates with the drive mechanism 9, and a receiving groove 122 at its bottom. The receiving groove 122 is connected to the threaded hole through a connecting hole. The receiving groove 122 is provided with a chuck 123, a flat bearing 124, a double-row ball bearing 125 and a retaining ring 126 from top to bottom. A retaining groove 127 is provided at the retaining ring 126 corresponding to the receiving groove 122.

[0051] The rivet head 128 is fitted within a plane bearing 124 and a double-row ball bearing 125, and one end of it, located within a receiving groove 122, engages with a chuck 123. In this invention, the rivet head 12 has a bearing structure designed to disperse high-frequency impact forces. The drive mechanism 9 rotates the joint body 121, and the power drives the rivet head 128 to rotate synchronously via the joint body 121. During the pressing process, the double-row ball bearing 125 counteracts radial vibrations. This multi-bearing combination design ensures that the rivet head 128 maintains a high degree of concentricity when contacting the rigid contraction portion 2, thereby ensuring the roundness of the riveted portion 6 and preventing burrs.

[0052] Furthermore, the top sidewall of the rivet head 128 is provided with a locking groove that engages with the chuck 123. This invention provides a locking groove at the top of the rivet head 128 to achieve engagement with the chuck 123, preventing the rivet head 128 from falling out of the connector body 121.

[0053] Furthermore, the chuck 123 includes a cylinder 1231, with a U-shaped groove 1232 formed on the outer wall of the cylinder 1231 and a recess 1233 extending through the U-shaped groove 1232 at the bottom of the cylinder 1231. An elastic locking member 1234 is provided inside the U-shaped groove 1232. When the rivet head 128 is inserted into the chuck 123, the rivet head 128 compresses the elastic locking member 1234, causing it to elastically deform within the U-shaped groove 1232. Then, when the locking groove corresponds to the elastic locking member 1234, the rivet head 128 automatically resets under the elastic force of the elastic locking member 1234 and locks into the locking groove, thereby achieving the locking of the rivet head 128 and the chuck 123.

[0054] Furthermore, the elastic retaining member 1234 is U-shaped. When replacing the rivet head 128, this invention only requires pulling the rivet head 128 outward, which will compress the elastic retaining member 1234, causing the elastic retaining member 1234 to deform, thereby allowing the rivet head 128 to be easily pulled out, thus achieving quick replacement of the rivet head 128.

[0055] In use, the piston rod 1 with the deformable part 3 and the piston 4 is placed on top of the pushing mechanism 11. The pushing mechanism 11 is controlled to push the piston rod 1 upward to a suitable position. Then, the clamping mechanism 10 is controlled to clamp the piston rod 1, and the driving mechanism 9 is controlled to work, so that the riveting head 12 rotates and moves downward to rivet the contraction part 2. As the riveting process proceeds, the top of the contraction part 2 is compressed and deformed, and extends outward to form the riveting part 6. The extrusion force generated by the riveting part 6 during its formation directly drives the piston 4 downward. At the same time, the piston 4 will compress the deformable part 3. After being compressed, the deformable part 3 deforms, and finally the deformable part 3 is limited and connected to the piston 4 and the piston rod 1. As the deformable part 3 deforms, the piston 4 will move axially towards the piston rod 1 along the contraction part 2. The movement of the piston 4 exposes more of the contraction part 2 of the piston 4, so that more of the contraction part 2 can be riveted into the riveting part 6, and finally the riveting is completed.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A gas spring high performance piston structure comprising a piston rod (1), characterized in that, It also includes a shrinkage part (2), which is located at one end of the piston rod (1). The end of the part connected to the piston rod (1) is provided with a deformation limiting groove (21). It is integrally cast with the piston rod (1), and its diameter is smaller than that of the piston rod (1). Deformable part (3), which is sleeved outside the contraction part (2); The piston (4) is sleeved outside the contraction part (2) and located on the top of the deformable part (3). An extrusion groove (5) is provided on the inner wall of the side away from the deformable part (3), and a mating groove (42) that mates with the deformable part (3) is provided on the side close to the deformable part (3). The riveting part (6) is formed by riveting the end of the contraction part (2) away from the piston rod (1). The deformation of the riveting part (6) can push the piston (4) to move and the deformation part (3) to deform. The deformation part (3) deforms and makes the deformation part (3) limit the connection between the deformation part (3) and the piston (4) and the piston rod (1). At the same time, it can enhance the sealing between the piston (4) and the piston rod (1). The movement of the piston (4) exposes more of the contraction part (2) of the piston (4), and more contraction parts (2) can be riveted into the riveting part (6). The deformable part (3) includes a hard ring (31). The hard ring (31) has an annular conical hard part (32) located in the mating groove (42) on the side near the piston (4). The annular conical hard part (32) has a deformable horn part (33) on the side near the piston (4). The hard ring (31) has an annular groove (34) on the side away from the piston (4). The inner wall of the annular groove (34) has a conical deformable part (35) that cooperates with the deformable limiting groove (21) to form a limiting connection.

2. The high performance piston structure for gas springs according to claim 1, characterized in that, A sealing groove (43) is provided on the middle side wall of the piston (4), and an elastic sealing ring (44) is provided in the sealing groove (43).

3. The high performance piston structure for gas springs according to claim 1, characterized in that, The mating groove (42) includes a conical groove (421) that mates with the annular conical hard part (32), and an arc-shaped guide limiting groove (422) that mates with the deformable horn part (33) is provided at the top of the conical groove (421).

4. The gas spring high-performance piston structure according to claim 1, characterized in that, The extrusion groove (5) is conical.

5. A dedicated riveting machine for high-performance gas spring piston structures, used to form the piston structure according to any one of claims 1-4, characterized in that, It includes a fixed base (7) and a column (8), wherein the column (8) is disposed on the top of the fixed base (7); The drive mechanism (9) is located at the top of the column (8); The clamping mechanism (10) is located in the middle of the column (8) and below the drive mechanism (9), and it is capable of clamping the piston rod (1); The push mechanism (11) has the column (8) located on the top of the fixed base (7) and can push the piston rod (1) with the retractable part (2) into the clamping mechanism (10); The riveting head (12) is located at the bottom of the output shaft of the drive mechanism (9) and is driven by the drive mechanism (9) to rotate and move up and down.

6. A dedicated riveting machine for high-performance gas spring piston structures according to claim 5, characterized in that, The riveting head (12) includes a connector body (121), with a threaded hole at the top that mates with the drive mechanism (9) and a receiving groove (122) at the bottom. The receiving groove (122) is connected to the threaded hole through a connecting hole. The receiving groove (122) is provided with a chuck (123), a plane bearing (124), a double-row ball bearing (125), and a retaining ring (126) from top to bottom. The retaining ring (126) corresponding to the receiving groove (122) is provided with a retaining groove (127). The rivet head (128) is fitted inside the flat bearing (124) and the double-row ball bearing (125), and one end of the rivet head located in the receiving groove (122) is engaged with the chuck (123).

7. A dedicated riveting machine for high-performance gas spring piston structures according to claim 6, characterized in that, The top side wall of the rivet head (128) is provided with a snap-fit ​​groove that engages with the chuck (123).

8. A dedicated riveting machine for high-performance gas spring piston structures according to claim 7, characterized in that, The chuck (123) includes a cylinder (1231), the outer wall of the cylinder (1231) is provided with a "U" shaped groove (1232), the bottom of the cylinder (1231) is provided with a groove (1233) that passes through the "U" shaped groove (1232), and an elastic snap-fit ​​member (1234) is provided in the "U" shaped groove (1232).

9. A dedicated riveting machine for high-performance gas spring piston structures according to claim 8, characterized in that, The elastic snap-fit ​​connector (1234) is U-shaped.

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