Gas spring capable of being stably locked

Abstract

The utility model relates to a stably-locked gas spring, which comprises a pressing guide sleeve arranged in a mounting cavity at the tail part of a piston and provided with a guide hole along the axial direction of the pressing guide sleeve; the check ring is arranged in the mounting cavity, the two end faces of the check ring abut against the pressing guide sleeve and the end face of the mounting cavity respectively, a hole body pre-pressing spring connected with the rodless cavity is arranged on the check ring, the check ring is arranged in the pressing guide sleeve, one end of the check ring abuts against the check ring, the other end of the check ring abuts against the tail of the valve element, and a limiting ring at the tail of the valve element abuts against a sealing ring in the mounting channel; the communicating hole is formed in the valve element in the radial direction, and the rod cavity communicates with the mounting channel through the communicating hole; compared with a traditional mode that gas or oil in a rodless cavity abuts against the end face of a limiting ring to achieve locking, the compression guide sleeve and the pre-compression spring are additionally arranged in the scheme, the pre-compression spring resets and extends to act on the end face of the limiting ring, the limiting ring and the sealing ring are attached and sealed, the attaching force between the valve element and the sealing ring is increased, and stable locking of the gas spring is achieved.

Description

Technical Field

[0001] This utility model relates to gas springs, and more particularly to a stable and locking gas spring. Background Technology

[0002] like Figure 1 The above is a cross-sectional view of a conventional gas spring. After pressing the push rod, gas or oil enters the rod chamber from the rodless chamber, realizing the linear movement of the piston rod and piston. When the piston rod position needs to be locked, no pressure needs to be applied to the end of the push rod. At this time, the gas or oil in the rodless chamber acts on the limiting ring at the tail of the valve core, so that the limiting ring contacts the sealing ring, restricting the gas or oil in the rodless chamber from entering the rod chamber.

[0003] However, in actual operation, due to the small end face area of ​​the limit ring, the air pressure in the rodless cavity and the force on the end face are also small, resulting in a small contact pressure between the limit ring and the sealing ring. Gas or oil in the rodless cavity may enter the rod cavity from the gap between the limit ring and the sealing ring, causing locking failure.

[0004] In summary, how to enhance the locking between the limiting ring and the sealing ring to achieve stable locking of the gas spring has become an urgent problem for researchers in this field. Utility Model Content

[0005] The technical problem to be solved by this utility model is: how to increase the locking between the limiting ring and the sealing ring;

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] This utility model relates to a stable locking gas spring, comprising: a cylinder body; a piston movably disposed within the cylinder body; a piston rod, one end of which is connected to the piston, and the other end of which is located outside the cylinder body, forming a through mounting channel with the interior of the piston; a push rod movably disposed within the mounting channel, with its head protruding from the end of the piston rod; a valve core movably disposed within the mounting channel and coaxially arranged with the push rod, having a small-diameter section in its middle and a limiting ring at its tail; and a clamping guide sleeve disposed at the piston tail. A guide hole is provided in the mounting chamber at the valve core along its axial direction; a retaining ring is provided in the mounting chamber, with its two end faces abutting against the clamping guide sleeve and the end face of the mounting chamber, respectively; a preload spring with a hole for connecting to the rodless chamber is provided on the retaining ring, which is provided in the clamping guide sleeve, with one end abutting against the retaining ring and the other end abutting against the tail of the valve core, and abutting the limiting ring at the tail of the valve core against the sealing ring in the mounting channel; a connecting hole is provided radially at the valve core, which connects the rod chamber and the mounting channel;

[0008] In this solution, when it is necessary to adjust the movement of the piston rod, by pressing the push rod, the push rod drives the valve core to move to the right. The preload spring is compressed, the valve core's limiting ring separates from the sealing ring, and the gas or oil in the rodless chamber enters the rod chamber through the hole, the gap between the sealing ring and the small diameter section, the installation channel, and the connecting hole, so as to realize the movement of the piston and piston rod relative to the cylinder body to the right.

[0009] When the gas spring needs to be locked, in addition to the gas or oil in the rodless chamber acting on the end face of the limit ring through the orifice and guide hole, the preload spring returns to its original position due to the movement of the valve core and push rod to the left, and acts on the end face of the limit ring, making the limit ring contact and seal with the sealing ring. At this time, the gas or oil in the rodless chamber cannot enter the rod chamber, thus achieving stable locking of the gas spring.

[0010] Compared to the traditional rodless chamber gas or oil pressure locking method, this solution adds a pressure guide sleeve and a preload spring. The preload spring returns to its original position and extends, acting on the end face of the limit ring to seal the limit ring against the sealing ring. This increases the contact force between the valve core and the sealing ring, achieving stable locking of the gas spring.

[0011] To illustrate how the retaining ring is installed, this invention uses an inward folding at the end of the piston to form a mounting surface for placing the retaining ring.

[0012] The piston end is folded inward to form a mounting surface, which contacts the end face of the retaining ring, thus enabling the placement and installation of the retaining ring.

[0013] To illustrate the specific structure of the guide hole, this utility model uses a guide hole having a first inner hole and a second inner hole, wherein the diameter of the first inner hole is larger than the diameter of the second inner hole; a portion of the preload spring is located inside the second inner hole, and the limiting ring is movably located inside the first inner hole;

[0014] A portion of the preload spring is located in the second inner hole, ensuring that the preload spring remains axially aligned during compression or resetting elongation. The second inner hole functions in conjunction with the limiting ring, allowing the limiting ring to move to the right within the second inner hole, which acts as a guide. Furthermore, there is a gap between the second inner hole and the limiting ring for the flow of gas or oil.

[0015] In order to achieve the positioning and installation of the clamping guide sleeve and the valve core, this utility model adopts a positioning groove at the end of the clamping guide sleeve; and a positioning protrusion matching the positioning groove is provided on the inner wall of the installation cavity.

[0016] The positioning and installation between the clamping guide sleeve and the valve core are achieved through the cooperation of the positioning groove and positioning protrusion.

[0017] To facilitate the installation of the sealing ring, this invention employs a stepped surface within the valve core for placing the sealing ring; the end face of the clamping guide sleeve abuts against the side of the sealing ring.

[0018] The stepped surface and the end face of the compression guide sleeve form a sealing groove for installing the sealing ring.

[0019] To limit the rotation of the retaining ring relative to the mounting surface, this utility model employs a riveted connection between the retaining ring and the mounting surface.

[0020] When the retaining ring is installed in this way, the retaining ring will not rotate relative to the mounting surface.

[0021] The beneficial effects of this utility model are as follows: This utility model is a stable locking gas spring. Compared with the traditional rodless chamber gas or oil pressing against the end face of the limiting ring to achieve locking, this solution adds a pressure guide sleeve and a pre-compression spring. The pre-compression spring returns and extends, acting on the end face of the limiting ring to fit and seal the limiting ring with the sealing ring, increasing the contact force between the valve core and the sealing ring, and realizing the stable locking of the gas spring. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 It is a traditional gas spring;

[0024] Figure 2 This is a cross-sectional view of the present invention in a locked state;

[0025] Figure 3 This is a cross-sectional view of the present invention in an adjusted state;

[0026] Figure 4 This is a cross-sectional view of the compression guide sleeve;

[0027] In the diagram: 1-cylinder body, 2-piston, 21-mounting surface, 3-piston rod, 4-push rod, 5-valve core, 51-small diameter section, 52-limiting ring, 6-pressure guide sleeve, 61-guide hole, 611-first inner hole, 612-second inner hole, 62-positioning groove, 7-retaining ring, 8-preload spring, 9-connecting hole, 10-sealing ring. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0029] like Figure 2-4As shown, this utility model is a stable locking gas spring, comprising: a cylinder body 1; a piston 2, which is movably disposed within the cylinder body 1; a piston rod 3, one end of which is connected to the piston 2, and the other end of which is located outside the cylinder body 1, forming a through mounting channel with the interior of the piston 2; a push rod 4, which is movably disposed within the mounting channel, with its head protruding from the end of the piston rod 3; a valve core 5, which is movably disposed within the mounting channel and coaxially disposed with the push rod 4, having a small diameter section 51 in its middle and a limiting ring 52 at its tail; and a clamping guide sleeve 6, which is disposed at the tail of the piston 2. Inside the mounting chamber, a guide hole 61 is provided along its axial direction; a retaining ring 7 is disposed in the mounting chamber, with its two end faces abutting against the clamping guide sleeve 6 and the end face of the mounting chamber, respectively, and a hole 71 is provided on it for connecting to the rodless cavity; a preload spring 8 is disposed in the clamping guide sleeve 6, with one end abutting against the retaining ring 7 and the other end abutting against the limiting ring 52 at the tail of the valve core 5, and abutting the limiting ring 52 at the tail of the valve core 5 against the sealing ring 10 in the mounting channel; a connecting hole 9 is radially opened at the valve core 5, which connects the rod cavity and the mounting channel;

[0030] In this solution, when it is necessary to adjust the movement of the piston rod, by pressing the push rod, the push rod drives the valve core to move to the right. The preload spring is compressed, the valve core's limiting ring separates from the sealing ring, and the gas or oil in the rodless chamber enters the rod chamber through the hole, the gap between the sealing ring and the small diameter section, the installation channel, and the connecting hole, so as to realize the movement of the piston and piston rod relative to the cylinder body to the right.

[0031] When the gas spring needs to be locked, in addition to the gas or oil in the rodless chamber acting on the end face of the limit ring through the orifice and guide hole, the preload spring returns to its original position due to the movement of the valve core and push rod to the left, and acts on the end face of the limit ring, making the limit ring contact and seal with the sealing ring. At this time, the gas or oil in the rodless chamber cannot enter the rod chamber, thus achieving stable locking of the gas spring.

[0032] Compared to the traditional rodless chamber gas or oil pressure locking method, this solution adds a pressure guide sleeve and a preload spring. The preload spring returns to its original position and extends, acting on the end face of the limit ring to seal the limit ring against the sealing ring. This increases the contact force between the valve core and the sealing ring, achieving stable locking of the gas spring.

[0033] like Figure 2-4 As shown, in order to illustrate how the retaining ring is installed, the present invention adopts a method in which the end of the piston 2 is folded inward to form a mounting surface 21 for placing the retaining ring 7;

[0034] The piston end is folded inward to form a mounting surface, which contacts the end face of the retaining ring, thus enabling the placement and installation of the retaining ring.

[0035] like Figure 2-4As shown, to illustrate the specific structure of the guide hole, the present invention uses a guide hole 61 having a first inner hole 611 and a second inner hole 612, wherein the diameter of the first inner hole 611 is larger than the diameter of the second inner hole 612; a portion of the preload spring 8 is located within the second inner hole 612, and the limiting ring 52 is movably located within the first inner hole 611;

[0036] A portion of the preload spring is located in the second inner hole, ensuring that the preload spring remains axially aligned during compression or resetting elongation. The second inner hole functions in conjunction with the limiting ring, allowing the limiting ring to move to the right within the second inner hole, which acts as a guide. Furthermore, there is a gap between the second inner hole and the limiting ring for the flow of gas or oil.

[0037] like Figure 2-4 As shown, in order to achieve the positioning and installation of the clamping guide sleeve and the valve core, the present invention adopts a positioning groove 62 at the end of the clamping guide sleeve 6; and a positioning protrusion matching the positioning groove 62 is provided on the inner wall of the installation cavity.

[0038] The positioning and installation between the clamping guide sleeve and the valve core are achieved through the cooperation of the positioning groove and positioning protrusion.

[0039] like Figure 2-4 As shown, in order to install the sealing ring, the present invention employs a stepped surface inside the valve core 2 for placing the sealing ring 10; the end face of the clamping guide sleeve 6 abuts against the side of the sealing ring 10.

[0040] The stepped surface and the end face of the compression guide sleeve form a sealing groove for installing the sealing ring.

[0041] like Figure 2-4 As shown, in order to limit the rotation of the retaining ring relative to the mounting surface, the present invention uses the retaining ring 7 to be riveted to the mounting surface 21;

[0042] When the retaining ring is installed in this way, the retaining ring will not rotate relative to the mounting surface.

[0043] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A stable locking gas spring, characterized in that, include: Cylinder block (1); Piston (2), which is movably disposed within the cylinder (1); The piston rod (3) has one end connected to the piston (2) and the other end located outside the cylinder (1), forming a through mounting channel with the inside of the piston (2); The push rod (4) is movably disposed within the mounting channel, with its head protruding from the end of the piston rod (3); The valve core (5) is movably disposed in the mounting channel and coaxially disposed with the top rod (4), having a small diameter section (51) in its middle and a limiting ring (52) at its tail. A compression guide sleeve (6) is provided in the mounting chamber at the tail of the piston (2), and a guide hole (61) is provided along its axial direction; A retaining ring (7) is disposed in the mounting chamber, with its two end faces abutting against the clamping guide sleeve (6) and the end face of the mounting chamber, respectively. A hole (71) is provided on it for connection with the rodless cavity. A preload spring (8) is provided inside the clamping guide sleeve (6). One end of the spring abuts against the retaining ring (7), and the other end abuts against the limiting ring (52) at the tail of the valve core (5). The limiting ring (52) at the tail of the valve core (5) abuts against the sealing ring (10) in the installation channel. A connecting hole (9) is radially opened at the valve core (5), which connects the rod chamber and the mounting channel.

2. The stable locking gas spring according to claim 1, characterized in that, The end of the piston (2) is folded inward to form a mounting surface (21) for placing the retaining ring (7).

3. The stable locking gas spring according to claim 2, characterized in that, The guide hole (61) has a first inner hole (611) and a second inner hole (612), wherein the diameter of the first inner hole (611) is larger than the diameter of the second inner hole (612); A portion of the preload spring (8) is located within the second inner hole (612), and the limiting ring (52) is movably located within the first inner hole (611).

4. A stable locking gas spring according to claim 3, characterized in that, A positioning groove (62) is provided at the end of the clamping guide sleeve (6); The inner wall of the mounting cavity is provided with a positioning protrusion that matches the positioning groove (62).

5. A stable locking gas spring according to claim 4, characterized in that, The valve core (2) has a stepped surface for placing the sealing ring (10); The end face of the compression guide sleeve (6) abuts against the side of the sealing ring (10).

6. A stable locking gas spring according to claim 5, characterized in that, The retaining ring (7) is riveted to the mounting surface (21).

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