A gas spring damper device

Abstract

The utility model provides a kind of air spring buffer device, including cylinder, piston rod, cylinder sealing ring and piston rod guide slot, piston, connecting piece being connected to piston rod and cylinder, the inside of the cylinder is sequentially provided with the gradual change groove section located in one side, floating piston limit block, gas cavity inflation valve, bottom boss from piston rod opening end to closed bottom end;The cylinder is divided into upper oil liquid section, lower gas section two sections by its inside floating piston, wherein gas section cylinder is provided with inflation valve, oil liquid section is equipped with hydraulic oil, and gas section is filled with high-purity nitrogen by inflation valve;The piston is divided into upper part of larger radius and lower part of smaller radius, which is less than the limit range of limit block, and is all embedded and installed on piston rod, and upper piston is provided with several throttle holes.This technical scheme can optimize user experience smoothness, reduce ground impact force, reduce impact noise, avoid parts from loosening or deformation due to long-term heavy impact, and prolong the service life of fitness equipment.

Description

Technical Field

[0001] This utility model relates to the field of fitness equipment accessories, and in particular to a gas spring buffer device. Background Technology

[0002] With the increasing popularity of home fitness and miniaturized fitness equipment, folding treadmills, exercise bikes, dumbbell benches, and other similar devices have become popular choices due to their space-saving storage capabilities. These devices generally rely on gas springs for effortless folding and lifting, as well as for cushioning during unfolding and descent. When folding, the gas spring provides auxiliary support to reduce the lifting load; when unfolding, it controls the descent speed through resistance to prevent collision injuries. These devices are typically heavy, have a fixed range of motion, and are used frequently, placing stringent demands on the gas spring's force adjustment precision, noise reduction, and end-effector protection. Existing gas spring cushioning solutions suffer from structural design limitations and insufficient smoothness of operation. Many employ a single throttle orifice design, lacking gradual adjustment, resulting in discontinuous force connection during use. Users may experience jamming when unfolding or folding, and the impact is concentrated at the end of the movement. Relying solely on rubber pads to cushion impacts leads to wear, deformation, and even loosening of parts, shortening the device's lifespan. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a gas spring buffer device, comprising a cylinder, a piston rod, a cylinder sealing ring and a piston rod guide groove, and a piston. The cylinder sealing ring and piston rod guide groove are located at the open end of the cylinder. The piston rod is inserted into the cylinder through the cylinder sealing ring and piston rod guide groove. The piston is fitted into the inner end of the piston rod in the cylinder. Connecting parts for connecting instruments are respectively provided at the outer end of the piston rod and the sealed end of the cylinder. Inside the cylinder, from the open end of the piston rod to the closed bottom end, there are sequentially arranged a gradually changing groove section on one side, a floating piston limiting block, a gas chamber inflation valve, and a bottom boss. The cylinder is divided into an upper oil section and a lower gas section by the floating piston inside. The gas section is equipped with an inflation valve, the oil section is filled with hydraulic oil, and the gas section is filled with high-purity nitrogen through the inflation valve. The piston is divided into an upper part with a larger radius that fits into the cylinder and a lower part with a radius smaller than the limiting range of the limiting block. Both are fitted into the piston rod, and the upper piston is provided with several throttling orifices.

[0004] Preferably, the inner diameter of the cylinder is 25-40 mm and the outer diameter is 31-45 mm.

[0005] Preferably, the gradient groove section accounts for 60% to 80% of the total internal length of the cylinder.

[0006] Preferably, the width of the gradient groove segment is 2 to 6 mm, and the deepest part is 0.2 to 0.8 mm.

[0007] Preferably, the diameter of the throttling orifice is 0.8 to 1.5 mm, and there are 4 to 8 orifices.

[0008] Preferably, the floating piston has two sealing grooves on its outer periphery and is provided with O-ring seals.

[0009] Preferably, the piston rod guide groove is a sealing structure, including at least a dustproof sealing ring and a piston rod sealing ring.

[0010] Compared with the prior art, the beneficial effects of this utility model are: optimizing the user experience of smoothness during the folding and unfolding of fitness equipment, while multiple buffers at the end reduce the impact force when hitting the ground, reduce impact noise, and also prevent parts from loosening or deforming due to long-term heavy impact, thus extending the service life and operational stability of fitness equipment. Attached Figure Description

[0011] Figure 1 This is a cross-sectional structural diagram of the present invention; Figure 2 This is a schematic diagram of the installation structure of Embodiment 1 of this utility model; Figure 3 This is an enlarged schematic diagram of the upper part of the piston of this utility model; Labeling Explanation: 1-Connector; 2-Cylinder body; 21-Gradual groove; 22-Cylinder wall; 23-Piston limiting block; 24-Bottom boss; 25-Inflation valve; 3-Piston rod; 4-Upper part of piston; 41-Throttle orifice; 5-Lower part of piston; 6-Floating piston; 7-Piston rod guide groove; 71-Dustproof sealing ring; 72-Piston rod sealing ring. Detailed Implementation

[0012] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0013] A gas spring buffer device includes a cylinder body 2, a piston rod 3, a cylinder body sealing ring and a piston rod guide groove 7, and a piston 5. The cylinder body sealing ring and the piston rod guide groove 7 are disposed at the open end of the cylinder body 2. The piston rod 3 is inserted into the cylinder body 2 through the cylinder body sealing ring and the piston rod guide groove 7. The piston 5 is fitted and installed inside the cylinder body of the piston rod 3. Connecting parts 1 for connecting instruments are respectively provided at the outer end of the piston rod 3 and the sealed end of the cylinder body 2. The device is characterized in that: the cylinder body (2) is provided with a series of positioning devices from the open end of the piston rod to the closed bottom end. The cylinder 2 has a gradient groove section 21 on one side, a floating piston limiting block 23, a gas chamber charging valve 25, and a bottom boss 24. The cylinder body 2 is divided into an upper oil section and a lower gas section by the floating piston 6 inside it. The gas section cylinder body is equipped with a charging valve 25, the oil section is filled with hydraulic oil, and the gas section is filled with high-purity nitrogen through the charging valve. The piston 5 is divided into an upper part 4 with a larger radius that fits into the cylinder body and a lower part 5 with a radius smaller than the limiting range of the limiting block. Both are fitted onto the piston rod, and the upper piston is equipped with several throttling holes 41.

[0014] Combined with appendix Figure 2 To explain the actual operation, during the folding process of the instrument, i.e., the extension of the gas spring (direction 1), the piston rod 3 inside the spring gradually extends outward, and the gas gradually expands from an extremely compressed state, pushing the floating pistons 4 and 5 to gradually move upward. This section is supported by the expansion of the gas, reducing the force required for the user to lift. As the folded part of the instrument gradually rises, the piston 4 moves to the gradually changing groove section 21 set in the cylinder 2, and the pulling force generated by the piston 4 gradually decreases, allowing the user to easily complete the lifting operation. During the unfolding process of the instrument, i.e., the compression of the gas spring (direction 2), it initially passes through a groove section that gradually becomes shallower. 21. The force provided by this device is mainly due to the resistance formed by the oil flowing through the groove 21 and the throttling orifice 41. As the device gradually unfolds, the groove 21 gradually becomes shallower until it disappears, and the resistance gradually increases to support the device's descent. This process requires very little force from the user, with the gas spring providing cushioning. In the final stage, after the piston 4 has completed the oil section, it begins to compress the gas in the gas section. The compressed gas provides a larger reaction force for final cushioning, and the bottom boss 24 further reduces the impact force upon contact with the ground, reduces impact noise, and also prevents parts from loosening or deforming due to long-term heavy impacts, thus extending the service life and operational stability of the fitness equipment. The floating piston limiting block 23 aims to prevent the floating piston 6 from being pushed into the groove section 21 due to gas expansion, which would cause the gas to mix with the oil. The lower end 5 of the piston is slightly smaller than the lower part of the limiting block 23's limiting range, allowing it to push the floating piston 6 past the limiting block 23 to compress the gas.

[0015] Preferably, the inner diameter of the cylinder 2 is 25-40 mm and the outer diameter is 31-45 mm.

[0016] Preferably, the gradient groove segment 21 accounts for 60% to 80% of the total length of the cylinder body.

[0017] The 60%–80% length ratio makes the depth change of the gradient groove section smoother, and the rate of change of groove depth from deepest to shallowest or vice versa is smaller, and the corresponding resistance or pulling force increases or decreases smoothly accordingly; 20%–40% of the cylinder length is reserved as the gas section, and the floating piston has sufficient running stroke to ensure that the volume change rate of the gas from the initial state to the end when it is compressed is reasonable, thereby generating stable resistance or thrust. Together with the bottom boss, it realizes the triple protection of liquid resistance buffer, gas buffer and mechanical limit.

[0018] Preferably, the width of the gradient groove segment 21 is 2 to 6 mm, and the deepest part is 0.2 to 0.8 mm.

[0019] A width of 2-6mm balances sufficient flow and controllable adjustment, avoiding situations where the width is too narrow, resulting in a small cross-sectional area for oil flow and causing throttling and blockage; or where the width is too wide, resulting in a large cross-sectional area for oil flow and insufficient resistance to oil flow. Even with gradual changes in the fit depth, the overall range of hydraulic resistance changes is small, leading to insignificant force adjustment and a significant weakening of the buffering function.

[0020] Preferably, the diameter of the throttling orifice is 0.8 to 1.5 mm, and there are 4 to 8 orifices.

[0021] Preferably, the floating piston has two sealing grooves on its outer periphery and is provided with O-ring seals.

[0022] Preferably, the piston rod guide groove 7 is a sealing structure, including at least a dustproof sealing ring 71 and a piston rod sealing ring 72.

[0023] During the use of fitness equipment, the piston rod surface is prone to contaminants such as sweat, dust, and hair. The dustproof sealing ring 71 removes these contaminants that adhere to the piston rod during its reciprocating motion, intercepting them outside the cylinder body. This prevents sweat from seeping into the cylinder body and corroding the interior, and also prevents dust particles from entering the oil cavity and mixing with the hydraulic oil to form sludge, which would aggravate the wear between the piston and the cylinder wall and cause damping fluctuations. The piston rod sealing ring 72 prevents high-pressure hydraulic oil from leaking out of the oil cavity, ensuring stable damping performance of the gas spring and a clean environment.

[0024] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A gas spring buffer device, comprising a cylinder (2), a piston rod (3), a cylinder sealing ring and a piston rod guide groove (7), and a piston, wherein the cylinder sealing ring and the piston rod guide groove (7) are disposed at the open end of the cylinder (2), the piston rod (3) is inserted into the cylinder (2) through the cylinder sealing ring and the piston rod guide groove (7), the piston is fitted and installed at the inner end of the piston rod (3) in the cylinder, and the outer end of the piston rod (3) and the sealed end of the cylinder (2) are respectively provided with connecting parts (1) for connecting instruments, characterized in that: The cylinder body (2) is provided with a gradually changing groove section (21) on one side, a floating piston limiting block (23), a gas chamber charging valve (25), and a bottom boss (24) from the open end of the piston rod to the closed bottom end. The cylinder body (2) is divided into an upper oil section and a lower gas section by the floating piston (6) inside it. The gas section cylinder body is provided with a charging valve (25), the oil section is filled with hydraulic oil, and the gas section is filled with high-purity nitrogen through the charging valve. The piston is divided into an upper part (4) with a larger radius that fits the cylinder body and a lower part (5) with a smaller radius than the limiting block. Both are fitted on the piston rod, and the upper piston is provided with several throttling holes (41).

2. The gas spring buffer device as described in claim 1, characterized in that: The cylinder body (2) has an inner diameter of 25-40 mm and an outer diameter of 31-45 mm.

3. The gas spring buffer device as described in claim 1, characterized in that: The gradient groove section (21) accounts for 60% to 80% of the total length of the cylinder body.

4. The gas spring buffer device as described in claim 1, characterized in that: The width of the gradient groove section (21) is 2 to 6 mm, and the depth of the deepest part is 0.2 to 0.8 mm.

5. The gas spring buffer device as described in claim 1, characterized in that: The diameter of the throttling orifice is 0.8 to 1.5 mm, and there are 4 to 8 orifices.

6. The gas spring buffer device as described in claim 1, characterized in that: The floating piston has two sealing grooves on its outer periphery and is equipped with O-ring seals.

7. The gas spring buffer device as described in claim 1, characterized in that: The cylinder sealing ring and piston rod guide groove (7) are sealing structures, including at least a dustproof sealing ring (71) and a piston rod sealing ring (72).

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