Damping type gas spring with improved structure

Abstract

The damping type gas spring with the improved structure comprises a cylinder barrel, a piston and a piston rod, the piston is movably arranged in the cylinder barrel, one end of the piston rod is fixedly connected with the piston, the other end of the piston rod extends out of the cylinder barrel, and an inner cavity of the cylinder barrel is divided into a first cavity and a second cavity by the piston. The piston is fixedly sleeved with a felt barrel in sealing fit with the inner wall of the cylinder barrel, a damping channel is formed in the piston and penetrates through the two ends of the piston, and the first cavity communicates with the second cavity through the damping channel. The felt cylinder is sleeved outside the piston, and compared with an O-shaped ring or a bowl-shaped ring in the prior art, the felt cylinder does not expand like a rubber part and generate larger deformation during standing, so that larger static locking force is prevented from being generated during starting, the starting force is reduced, and more labor is saved during operation of a user. And meanwhile, damping is conveniently controlled through the arrangement of the felt cylinder, and the consistency between products is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas springs, in particular to a damping gas spring with an improved structure. Background Art

[0002] A gas spring is an industrial accessory that provides support, cushioning, braking, height adjustment, and angle adjustment. It primarily consists of a pressure cylinder, piston rod, piston, sealing guide sleeve, filler, and joints. The principle is to fill a sealed pressure cylinder with an inert gas or oil-gas mixture, raising the pressure inside the chamber to several or even dozens of times higher than atmospheric pressure. The piston rod's smaller cross-sectional area than the piston's creates a pressure differential to achieve piston rod movement. Gas springs are commonly used in RV windows, primarily to support them when open. The quality of a gas spring is primarily evaluated based on two factors: first, the ability to provide a high supporting force, ensuring reliable support for the window, when charged with the same damping medium; and second, the ability to minimize static locking force, reducing user effort. The supporting force of a gas spring refers to the reaction force generated by the internal damping pressure when the gas spring is subjected to an external load, maintaining its balance and stability. The static locking force of a gas spring refers to the maximum locking force it can provide under static conditions, when the external force applied to the gas spring and the internal pressure remain constant.

[0003] The specific structure and working principle of the gas spring can be found in a damping gas spring disclosed in a Chinese utility model patent (publication number: CN219809331U), which includes a cylinder and a piston assembly. The piston assembly includes a piston, a piston rod and a valve plate. The piston rod is connected to the piston. Two mounting grooves are provided on the outer circumference of the piston. An O-ring is installed in each mounting groove. The piston seals and divides the cylinder into a first chamber and a second chamber through the O-ring. The piston is provided with multiple groups of medium channels running through its two end faces. The valve plate is fixedly mounted on the two end faces of the piston for covering the medium channels. The left end face of the piston is provided with a first groove connecting part of the medium channels, and the right end face of the piston is provided with a second groove connecting the remaining medium channels. When the piston rod is extended relative to the cylinder body, the damping medium in the first chamber can pass through the first groove, the medium channel corresponding to the first groove, and push open the right valve plate to enter the second chamber; when the piston rod is retracted relative to the cylinder body, the damping medium in the second chamber can pass through the second groove, the medium channel corresponding to the second groove, and push open the left valve plate to enter the first chamber to drive the piston to move to the right. The damping size is easy to control and the processing is convenient.

[0004] However, the damping gas spring disclosed in the above-mentioned prior art has the following problems: ① Two O-rings are provided on the outer periphery of the piston. The contact area between the O-rings and the inner wall of the cylinder is smaller, with line contact or near-line contact, resulting in a relatively small static locking force, making operation more labor-saving for the user. However, when the spring is left at rest (such as when opened, closed, and left for several days), the O-rings, made of rubber, expand and tend to deform radially outward. This increases the contact area between the rubber rings and the inner wall of the cylinder, causing a sharp increase in friction and generating a large static locking force. This requires the user to exert great force to pull the spring, which is not only labor-intensive but also potentially causes deformation or even damage to the window. ② Valve plates are fixedly mounted on both ends of the piston to seal the medium channel. The arrangement of the valve plates makes it difficult to control the damping force, resulting in low consistency between products.

[0005] Therefore it is necessary to improve the existing technology. Utility Model Content

[0006] The purpose of the utility model is to solve the problem that the gas spring in the prior art will generate a large static locking force when it is stationary, so that the user needs to operate with great force to pull it, which not only has the disadvantage of being laborious to use, but also may cause deformation or even damage to the window and the problem of low consistency between products; at the same time, it is also to solve the problem that in the prior art, valve plates for sealing the medium channel are fixedly installed at both ends of the piston, and the arrangement of the valve plates makes it difficult to control the damping force, resulting in low consistency between products. A damping gas spring with an improved structure is proposed.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A damping gas spring with an improved structure includes a cylinder, a piston and a piston rod. The piston is movably arranged in the cylinder, one end of the piston rod is fixedly connected to the piston, and the other end of the piston rod extends to the outside of the cylinder. The piston divides the inner cavity of the cylinder into a first chamber and a second chamber. The external fixed sleeve of the piston is provided with a felt tube that seals with the inner wall of the cylinder. A damping channel is provided inside the piston. The damping channel runs through both ends of the piston, and the first chamber is connected to the second chamber through the damping channel.

[0009] Furthermore, the felt tube extends along the length direction of the piston.

[0010] Furthermore, the rear end of the piston is provided with a convex edge, and the rear end of the felt tube is in abutment with the convex edge.

[0011] Furthermore, the outer diameter of the felt tube is larger than the outer diameter of the convex edge.

[0012] Furthermore, the piston is made of metal.

[0013] Furthermore, it also includes a piston gasket, which is arranged at the front end of the piston and is provided with a through hole for the damping medium to pass through.

[0014] Furthermore, a plug is provided at the rear end of the cylinder, and an O-ring is provided between the plug and the cylinder.

[0015] Furthermore, the front end of the cylinder is provided with a guide sleeve, a first seal, a first spacer, a second seal and a second spacer in sequence from front to back, and the piston rod passes through the second spacer, the second seal, the first spacer, the first seal and the guide sleeve in sequence and extends out of the cylinder.

[0016] Furthermore, the cylinder includes a front cylinder and a rear cylinder that are integrally arranged. The inner diameter of the front cylinder is smaller than the inner diameter of the rear cylinder. A transition slope is formed between the front cylinder and the rear cylinder.

[0017] Furthermore, the front end of the piston rod is fixedly connected to a front joint, and the rear end of the cylinder is fixedly connected to a rear joint.

[0018] After adopting the above structure, the beneficial effects of the utility model are:

[0019] (1) The utility model discloses a damping gas spring with an improved structure, comprising a cylinder, a piston, and a piston rod. The piston is movably arranged in the cylinder, one end of the piston rod is fixedly connected to the piston, and the other end of the piston rod extends to the outside of the cylinder. The piston divides the inner cavity of the cylinder into a first chamber and a second chamber. The outer fixed sleeve of the piston is provided with a felt sleeve that seals with the inner wall of the cylinder. The interior of the piston is provided with a damping channel that passes through both ends of the piston. The first chamber is connected to the second chamber through the damping channel. The felt sleeve is provided on the outer surface of the piston. Compared with the O-ring or bowl ring in the prior art, the felt sleeve will not expand or deform significantly when at rest like a rubber part, thereby avoiding the generation of a large static locking force during startup, reducing the startup force, and making the operation more labor-saving for the user.

[0020] (2) In the damping gas spring with an improved structure described in the present invention, the outer fixed sleeve of the piston is provided with a felt tube that seals with the inner wall of the cylinder, and the felt tube extends along the length of the piston. The design of the felt tube increases the contact area between the piston and the inner wall of the cylinder, thereby increasing the friction between the piston and the inner wall of the cylinder, thereby improving the supporting force of the gas spring.

[0021] (3) The damping gas spring with an improved structure described in the present invention eliminates the valve plates fixedly mounted on both ends of the piston and used to seal the damping channel in the prior art. The arrangement of the valve plates makes it difficult to control the damping, resulting in low consistency between products. The present invention increases the contact area between the piston and the inner wall of the cylinder through the design of the felt tube, thereby increasing the friction between the piston and the inner wall of the cylinder, so that the pressure in the first chamber and the pressure in the second chamber reach a balanced state, and the piston rod stops at the current position. The arrangement of the felt tube achieves convenient control of the damping, and improves the consistency between products. As is well known, the surface contact friction coefficient of the felt is large and highly uniform, and the friction coefficient is not easy to change over time, which makes the piston work with high stability and long service life. At the same time, this design reduces the number of parts, facilitates assembly, saves costs, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention, the following will briefly introduce the drawings required for use in the description of the specific implementation methods. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a cross-sectional view of the overall structure of the utility model;

[0024] Figure 2 This utility model Figure 1 A magnified schematic diagram of the structure at point A.

[0025] Figures 1 to 2 The winning bid number is:

[0026] 1. Cylinder barrel; 11. Front cylinder barrel; 111. Transition slope; 12. Rear cylinder barrel; 13. Rear joint; 2. Piston; 21. Damping channel; 22. Convex edge; 23. Felt tube; 3. Piston rod; 31. Front joint; 4. Piston gasket; 41. Through hole; 5. Seal; 51. O-ring; 6. Guide sleeve; 7. First seal; 8. First spacer; 9. Second seal; 10. Second spacer. DETAILED DESCRIPTION

[0027] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar improvements without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] In the description of the present invention, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] Furthermore, if the terms "first" or "second" appear, these terms are used 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 referred to. Thus, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, if the term "plurality" appears, the term "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0030] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connected," "fixed," etc., should be understood in a broad sense. For example, they can refer to fixed connection, removable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediary; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0031] In this utility model, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, "above," "above," and "above" a first feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. "Below," "below," and "below" a first feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0032] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this utility model are for illustrative purposes only and do not represent the only embodiment.

[0033] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] like Figures 1 to 2 As shown, a damping gas spring with an improved structure includes a cylinder 1, a piston 2, and a piston rod 3. The piston 2 is movably arranged in the cylinder 1. One end of the piston rod 3 is fixedly connected to the piston 2, and the other end of the piston rod 3 extends outside the cylinder 1. The piston 2 divides the inner cavity of the cylinder 1 into a first chamber and a second chamber. The outer fixed sleeve of the piston 2 is provided with a felt tube 23 that seals with the inner wall of the cylinder 1. The interior of the piston 2 is provided with a damping channel 21. The damping channel 21 runs through both ends of the piston 2. The first chamber is connected to the second chamber through the damping channel 21. The felt tube 23 extends along the length of the piston 2.

[0035] Based on the above embodiments, the present invention aims to provide a damping gas spring with an improved structure, comprising a cylinder 1, a piston 2, and a piston rod 3. The piston 2 is movably disposed in the cylinder 1, one end of the piston rod 3 is fixedly connected to the piston 2, and the other end of the piston rod 3 extends outside the cylinder 1. The piston 2 divides the inner cavity of the cylinder 1 into a first chamber and a second chamber. The outer fixed sleeve of the piston 2 is provided with a felt sleeve 23 that seals with the inner wall of the cylinder 1. The interior of the piston 2 is provided with a damping channel 21 that passes through both ends of the piston 2. The first chamber is connected to the second chamber through the damping channel 21. The felt sleeve 23 is provided on the outer surface of the piston 2. Compared with the O-ring or bowl ring in the prior art, the felt sleeve 23 does not expand or deform significantly when stationary like a rubber sealing ring, thereby avoiding the generation of a large static locking force during startup, reducing the startup force, and making user operation more labor-saving. At the same time, the design of the felt tube 23 increases the contact area between the piston 2 and the inner wall of the cylinder 1, thereby increasing the friction between the piston 2 and the inner wall of the cylinder 1, thereby improving the supporting force of the gas spring. Furthermore, it is well known that the surface contact friction coefficient of the felt is large and uniform, and the friction coefficient is not easy to change over time, which leads to high working stability and long service life.

[0036] In this embodiment, the valve plates fixedly mounted at both ends of the piston 2 to seal the damping channel 21, as in the prior art, are eliminated. The provision of these valve plates makes damping control difficult, resulting in low consistency across products. The present invention increases the contact area between the piston 2 and the inner wall of the cylinder 1 through the design of the felt tube 23, thereby increasing the friction between the piston 2 and the inner wall of the cylinder 1. This balances the pressure within the first chamber and the pressure within the second chamber, allowing the piston rod 3 to stop at its current position. The provision of the felt tube 23 facilitates damping control, improves consistency across products, reduces the number of components, facilitates assembly, saves costs, and improves production efficiency.

[0037] As another preferred embodiment of the present invention, the rear end of the piston 2 is provided with a convex edge 22, and the rear end of the felt tube 23 is in contact with the convex edge 22. The outer diameter of the felt tube 23 is larger than the outer diameter of the convex edge 22. Figure 2 As shown, the rear end of the felt tube 23 is limited by the setting of the convex edge 22 to prevent the felt tube 23 from coming off the piston 2 under the action of external force. The outer diameter of the felt tube 23 is larger than the outer diameter of the convex edge 22, so that the outer wall of the felt tube 23 forms a friction fit with the inner wall of the cylinder 1.

[0038] As another preferred embodiment of the present invention, the piston 2 is made of metal. Figure 1 and Figure 2 As shown, the piston 2 is made of metal, providing reliable support for the felt cylinder 23. The metal material also makes the piston 2 more durable and has a longer service life. In this embodiment, the piston 2 is fixedly mounted to the rear end of the piston rod 3 by riveting. The piston 2 is provided with a mounting hole for the rivet to pass through. This riveting ensures a reliable connection between the piston 2 and the piston rod 3.

[0039] As another preferred embodiment of the present invention, a piston gasket 4 is further included. The piston gasket 4 is arranged at the front end of the piston 2 and is provided with a through hole 41 for the damping medium to pass through. Figure 2 As shown, the front end of the felt cylinder 23 is limited by the arrangement of the piston gasket 4, so as to prevent the felt cylinder 23 from coming off the piston 2 under the action of external force. The arrangement of the through hole 41 facilitates the circulation of the damping medium.

[0040] As another preferred embodiment of the present invention, a plug 5 is provided at the rear end of the cylinder 1, and an O-ring 51 is provided between the plug 5 and the cylinder 1. The front end of the cylinder 1 is provided with a guide sleeve 6, a first seal 7, a first spacer 8, a second seal 9 and a second spacer 10 in sequence from front to back. The piston rod 3 passes through the second spacer 10, the second seal 9, the first spacer 8, the first seal 7 and the guide sleeve 6 in sequence and extends out of the cylinder 1. In this embodiment, as shown in FIG. Figure 1 As shown, the provision of a plug 5 and an O-ring 51 improves the sealing performance at the rear end of the cylinder 1. The provision of a guide sleeve 6 improves the coaxiality of the piston rod 3 with the cylinder 1 during movement. The provision of a first seal 7, a first spacer 8, a second seal 9, and a second spacer 10 improves the sealing performance between the piston rod 3 and the cylinder 1. In this embodiment, the first seal 7 and the second seal 9 are both bowl-shaped seals, but other seals are also acceptable.

[0041] As another preferred embodiment of the present invention, the cylinder 1 includes a front cylinder 11 and a rear cylinder 12 which are integrally arranged. The inner diameter of the front cylinder 11 is smaller than the inner diameter of the rear cylinder 12. A transition slope 111 is formed between the front cylinder 11 and the rear cylinder 12. Figure 1 As shown, the inner diameter of the front cylinder 11 is smaller than the inner diameter of the rear cylinder 12. In the initial state, when the piston 2 is located inside the rear cylinder 12, a relatively large gap is left between the piston 2 and the inner wall of the rear cylinder 12, making it easier for the damping medium to flow, which makes it more convenient for users to open and close the gas spring.

[0042] As another preferred embodiment of the present invention, the front end of the piston rod 3 is fixedly connected to a front joint 31, and the rear end of the cylinder 1 is fixedly connected to a rear joint 13. Figure 1 As shown, the arrangement of the front joint 31 and the rear joint 13 facilitates the connection and installation of the gas spring.

[0043] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A damping gas spring with an improved structure, comprising a cylinder (1), a piston (2) and a piston rod (3), wherein the piston (2) is movably arranged in the cylinder (1), one end of the piston rod (3) is fixedly connected to the piston (2), and the other end of the piston rod (3) extends to the outside of the cylinder (1), and the piston (2) divides the inner cavity of the cylinder (1) into a first chamber and a second chamber, characterized in that: The outer fixed sleeve of the piston (2) is provided with a felt tube (23) that is sealed with the inner wall of the cylinder (1). The interior of the piston (2) is provided with a damping channel (21), which runs through both ends of the piston (2). The first chamber is connected to the second chamber through the damping channel (21).

2. A damping gas spring with an improved structure according to claim 1, characterized in that: The felt cylinder (23) extends along the length direction of the piston (2).

3. The damping gas spring with an improved structure according to claim 1, characterized in that: The rear end of the piston (2) is provided with a convex edge (22), and the rear end of the felt cylinder (23) is in abutment with the convex edge (22).

4. The damping gas spring with an improved structure according to claim 3, characterized in that: The outer diameter of the felt tube (23) is greater than the outer diameter of the convex edge (22).

5. The damping gas spring with an improved structure according to claim 1, characterized in that: The piston (2) is made of metal.

6. The damping gas spring with an improved structure according to claim 1, characterized in that: It also includes a piston gasket (4), which is arranged at the front end of the piston (2), and is provided with a through hole (41) for the damping medium to pass through.

7. A damping gas spring with an improved structure according to any one of claims 1 to 6, characterized in that: A plug (5) is provided at the rear end of the cylinder (1), and an O-shaped sealing ring (51) is provided between the plug (5) and the cylinder (1).

8. The damping gas spring with an improved structure according to claim 7, characterized in that: The front end of the cylinder (1) is provided with a guide sleeve (6), a first sealing member (7), a first spacer (8), a second sealing member (9) and a second spacer (10) in sequence from front to back, and the piston rod (3) passes through the second spacer (10), the second sealing member (9), the first spacer (8), the first sealing member (7) and the guide sleeve (6) in sequence and extends out of the cylinder (1).

9. The damping gas spring with an improved structure according to claim 1, characterized in that: The cylinder barrel (1) comprises a front cylinder barrel (11) and a rear cylinder barrel (12) which are arranged in an integral manner. The inner diameter of the front cylinder barrel (11) is smaller than the inner diameter of the rear cylinder barrel (12). A transition slope (111) is formed between the front cylinder barrel (11) and the rear cylinder barrel (12).

10. The damping gas spring with an improved structure according to claim 1, characterized in that: The front end of the piston rod (3) is fixedly connected to a front joint (31), and the rear end of the cylinder barrel (1) is fixedly connected to a rear joint (13).

Images