Stepless locking gas spring

Abstract

The utility model discloses a stepless locking gas spring. The stepless locking gas spring comprises a cylinder barrel, a piston rod assembly, an oil-gas separation assembly, a guide sealing assembly and an end cover assembly. The oil-gas separation assembly is arranged in the cylinder barrel in a sealed mode, the guide sealing assembly and the end cover assembly are arranged at the two opposite ends of the cylinder barrel in a sealed mode, a gas cavity is formed between the oil-gas separation assembly and the end cover assembly, an oil cavity is formed between the oil-gas separation assembly and the guide sealing assembly, and the piston rod assembly is arranged in the oil cavity. The end cover assembly comprises an inflation end cover and a connecting end cover, the inflation end cover is connected to the cylinder barrel in a sealed mode and provided with an inflation hole communicating with the air cavity, and the inflation hole is blocked by the embedded part. The connecting end cover is connected to the inflation end cover, a sealing cavity surrounding the inflation hole is formed between the connecting end cover and the inflation end cover, and a connecting part suitable for being connected with an external component is arranged at the end, away from the inflation end cover, of the connecting end cover. According to the air spring, the sealing performance of the inflation hole and the reliability of the end cover assembly can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas springs, in particular to a stepless locking gas spring. BACKGROUND

[0002] In the prior art, the cylinder of the gas spring has a gas cavity, and the gas cavity is filled with high-pressure gas. At present, the industry mainly opens a gas filling channel on the connecting end cover at the end of the cylinder, and after filling gas in the gas cavity through the gas filling channel, the gas filling channel is sealed by a pin shaft or a steel ball. However, in the prior art, only the pin shaft is used for interference fit sealing, and the sealing effect is generally poor, which is easy to cause gas leakage and reduce the performance of the product. Therefore, in the current technology, sealing glue is added at the pin shaft sealing position for auxiliary sealing, but the actual effect cannot meet the long-term use requirements. In addition, the connecting end cover is a component for connecting with external components, for example, it is usually provided with a connecting stud, and the external component to be connected is provided with a matching connecting hole. In the prior art, due to the need to open a gas filling channel, the connecting stud has to be provided with a hollow structure, which on the one hand reduces the strength of the connecting end cover, and on the other hand, in the process of pressing the pin shaft, the connecting stud may be deformed, causing difficulty in installation of the gas spring and external components, or even unable to complete the connection; more seriously, in the process of pressing the pin shaft, the connecting stud may also crack, resulting in product scrap.

[0003] Therefore, it is necessary to provide a technical scheme to overcome the deficiencies in the prior art. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a stepless locking gas spring to improve the sealing performance of the gas filling hole and the reliability of the end cover assembly.

[0005] The present application is implemented by the following technical scheme: a stepless locking gas spring, comprising a cylinder, a piston rod assembly, an oil-gas separation assembly, a guide sealing assembly and an end cover assembly, the oil-gas separation assembly is sealingly arranged in the cylinder, the guide sealing assembly and the end cover assembly are sealingly arranged at opposite ends of the cylinder, the oil-gas separation assembly and the end cover assembly form a gas cavity therebetween, the oil-gas separation assembly and the guide sealing assembly form an oil cavity therebetween, the piston rod assembly is arranged in the oil cavity and has a piston rod extending out of the cylinder from the guide sealing assembly, wherein the end cover assembly comprises a gas filling end cover and a connecting end cover, the gas filling end cover is sealingly connected to the cylinder and has a gas filling hole communicating with the gas cavity, the gas filling hole is plugged by an embedded part, the connecting end cover is connected to the gas filling end cover and forms a sealing cavity around the gas filling hole between the connecting end cover and the gas filling end cover, and the end of the connecting end cover away from the gas filling end cover is provided with a connecting part adapted to be connected to an external component.

[0006] As a further improved technical solution, the connecting end cover is provided with a flange part at one end connected with the inflation end cover, and the flange part is in sealing connection with the inflation end cover to form the sealing cavity on the inner side of the flange part.

[0007] As a further improved technical solution, the inflation end cover is provided with a boss part around the inflation hole, and the boss part and the flange part are in plug-in cooperation with each other.

[0008] As a further improved technical solution, the connecting part is one of a solid threaded column, a hanging ring with a circular hole, and a U-shaped fork hanging ear with a connecting hole.

[0009] As a further improved technical solution, the embedded part is a pin shaft that is interference fitted in the inflation hole.

[0010] As a further improved technical solution, the piston rod assembly includes a piston connected to the end of the piston rod, the piston divides the oil cavity into a first working cavity and a second working cavity, and the piston is provided with a release valve that can move in the piston to switch the first working cavity and the second working cavity between a communication state and a blocking state.

[0011] As a further improved technical solution, the piston rod has a hollow cavity, and the piston rod assembly includes a jack rod arranged in the hollow cavity, and the inner end of the jack rod abuts against the release valve.

[0012] As a further improved technical solution, the hollow cavity includes a limiting step part, and the inner end of the jack rod has a limiting boss that cooperates with the limiting step part to limit the reset position of the jack rod.

[0013] As a further improved technical solution, the release valve includes a sealing cone part and a valve rod, the valve rod extends into the hollow cavity of the piston rod, and sealing members are arranged between the sealing cone part and the piston and between the valve rod and the piston rod, respectively.

[0014] As a further improved technical solution, the piston includes a narrow diameter section and a wide diameter section, the wide diameter section is in sealing contact with the inner wall surface of the cylinder barrel, and the narrow diameter section has a spacing space with the inner wall surface of the cylinder barrel, the piston includes a central passage that is opened along the axial direction of the piston and penetrates the end face of the wide diameter section, and a lateral passage that is opened on the narrow diameter section and communicates with the central passage and the spacing space.

[0015] The stepless locking gas spring provided by the application has an end cover assembly including an inflation end cover and a connecting end cover. The inflation end cover is sealingly connected to the cylinder and has an inflation hole communicating with the air cavity. The inflation hole is blocked by an embedded piece. The connecting end cover is connected to the inflation end cover and forms a sealing cavity around the inflation hole with the inflation end cover. In this way, the embedded piece and the inflation hole form a first sealing. The connecting end cover and the inflation end cover form a second sealing through the sealing cavity, which improves the sealing effect of the inflation hole and enhances the reliability of the product. Moreover, the connecting end cover is connected to the inflation end cover after blocking the inflation hole. The connecting end cover does not need to have a related hole structure for matching the inflation hole, so that the connecting end cover has better structural strength and the reliability of the connection between the connecting end cover and external components is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a sectional view of an embodiment of the stepless locking gas spring of the application.

[0017] Figure 2 is a sectional view of a piston rod assembly and a guide sealing assembly in an embodiment of the stepless locking gas spring of the application.

[0018] Figure 3 is a sectional view of an embodiment of the connecting end cover involved in the stepless locking gas spring of the application.

[0019] Figure 4 is a sectional view of another embodiment of the connecting end cover involved in the stepless locking gas spring of the application.

[0020] Figure 5 is a sectional view of still another embodiment of the connecting end cover involved in the stepless locking gas spring of the application.

[0021] The reference signs are as follows: 100, gas spring; 1, cylinder; 11, air cavity; 12, oil cavity; 121, spacing space; 2, piston rod assembly; 21, piston rod; 22, piston; 2201, central passage; 2202, lateral passage; 221, narrow diameter section; 222, wide diameter section; 23, release valve; 24, jacking rod; 241, limiting boss; 251, first sealing piece; 252, second sealing piece; 3, guide sealing assembly; 4, end cover assembly; 401, sealing cavity; 41, inflation end cover; 411, boss portion; 42, connecting end cover; 421, flange portion; 422, connecting portion; 43, embedded piece; 5, oil-gas separation assembly. DETAILED DESCRIPTION

[0022] In order to have a clearer understanding of the technical features, objects and effects of the application, the specific embodiments of the application will be described in detail with reference to the drawings.

[0023] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0024] Referring to FIG. 1, Figures 1 to 5 As shown in FIG. 1, the present application provides a stepless locking gas spring 100, which can be used in a backrest adjustment mechanism of a passenger car seat to achieve buffering opening and closing and locking at any opening angle. The stepless locking gas spring 100 can also be used in other moving mechanisms.

[0025] In the present embodiment, the stepless locking gas spring 100 includes a cylinder 1, a piston rod assembly 2, an oil-gas separation assembly 5, a guide sealing assembly 3 and an end cover assembly 4. The oil-gas separation assembly 5 is sealingly arranged in the cylinder 1, and the guide sealing assembly 3 and the end cover assembly 4 are sealingly arranged at opposite ends of the cylinder 1. A gas cavity 11 is formed between the oil-gas separation assembly 5 and the end cover assembly 4, and an oil cavity 12 is formed between the oil-gas separation assembly 5 and the guide sealing assembly 3. The piston rod assembly 2 is arranged in the oil cavity 12 and has a piston rod 21 extending out of the cylinder 1 from the guide sealing assembly 3. The end cover assembly 4 includes an inflation end cover 41 and a connecting end cover 42. The inflation end cover 41 is sealingly connected to the cylinder 1 and has an inflation hole communicating with the gas cavity 11. The inflation hole is blocked by an embedding piece 43. The connecting end cover 42 is connected to the inflation end cover 41 and forms a sealing cavity 401 around the inflation hole with the inflation end cover 41. The connecting end cover 42 is provided with a connecting portion 422 adapted to be connected to an external component at an end away from the inflation end cover 41.

[0026] In the stepless locking gas spring 100 provided by the present application, the embedding piece 43 cooperates with the inflation hole to form a first sealing, and the connecting end cover 42 and the inflation end cover 41 are connected to form a second sealing via the sealing cavity 401, which improves the sealing effect of the inflation hole and enhances the reliability of the product. Moreover, the connecting end cover 42 is connected to the inflation end cover 41 after blocking the inflation hole, and no related hole structure needs to be formed on the connecting end cover 42 to cooperate with the inflation hole, so that the connecting end cover 42 has better structural strength and the reliability of the connection between the connecting end cover 42 and the external component is enhanced.

[0027] Referring to FIG. 1, Figure 1As shown, in the embodiment, the embedded member 43 is a pin shaft which is interference fitted into the inflation hole. The pin shaft is pressed into the inflation hole under the action of external force. In order to facilitate the installation of the pin shaft into the inflation hole, the front end of the pin shaft can be provided with an inclined guide structure to guide the installation of the pin shaft. In other embodiments, the embedded member 43 can also be a steel ball or other components. The embedded member 43 blocks the inflation hole to form the first seal of the inflation hole.

[0028] In the embodiment, the end of the connection end cover 42 connected with the inflation end cover 41 is provided with a flange portion 421, and the flange portion 421 is sealingly connected with the inflation end cover 41 to form the sealing cavity 401 on the inner side of the flange portion 421. Further, the inflation end cover 41 is provided with a boss portion 411 surrounding the inflation hole, and the boss portion 411 and the flange portion 421 are inserted and matched with each other. In the embodiment, the boss portion 411 is inserted into the inner side of the flange portion 421 of the connection end cover 42; in other embodiments, the flange portion 421 of the connection end cover 42 can also be inserted into the inner side of the boss portion 411. In the embodiment, the connection end cover 42 is welded and fixed with the inflation end cover 41 after the inflation hole of the inflation end cover 41 is blocked by the embedded member 43. After welding, the circumference of the sealing cavity 401 is completely closed, achieving the function of secondary sealing of the inflation hole. In other embodiments, the connection end cover 42 and the inflation end cover 41 can also be fixed by other sealing connection modes.

[0029] Please refer to Figures 3 to 5 As shown, it is a structure schematic view of several embodiments of the connection end cover 42. In the embodiment as shown in Figure 3 In the embodiment as shown in Figure 4 In the embodiment as shown in Figure 5In the shown embodiment, the connecting part 422 of the connecting end cover 42 is a U-shaped forked lug with a connecting hole, which is suitable for connecting with an external component provided with a butt joint structure such as a pin column. Of course, in other embodiments, the specific structure of the connecting end cover 42 is not limited to this, and in general, the connecting end cover 42 and the inflation end cover 41 are separate parts, and the end cover assembly 4 fixed to the inflation end cover 41 after the inflation hole is blocked and forms a sealing cavity 401 for secondary sealing of the inflation hole do not deviate from the scope of the present application.

[0030] As shown in Figure 1 and Figure 2 The main function of the oil-gas separation assembly 5 is to prevent oil and gas from mixing and causing product failure. The oil-gas separation assembly 5 can include a main body frame and a sealing ring arranged on the outer periphery of the main body frame, which can be in sealing connection with the inner surface of the cylinder barrel 1, and the specific structure of the present application is not limited. The oil-gas separation assembly 5 is used to separate the gas cavity 11 and the oil cavity 12, the gas cavity 11 is filled with high-pressure gas such as nitrogen, and the oil cavity 12 is filled with hydraulic oil.

[0031] The guide sealing assembly 3 is provided with a hole for the piston rod 21 to pass through, and the guide sealing assembly 3 provides a guiding effect for the piston rod 21 while being sealed with the cylinder barrel 1 and the piston rod 21, reducing the activity of the piston rod 21 due to deviation from the axis. The cylinder barrel 1 is provided with a bent stopper at one end of the installation of the guide sealing assembly 3. The stopper is used to ensure the stability of the installation of the guide sealing assembly 3, avoiding its disengagement from the cylinder barrel 1. The cylinder barrel 1 is also provided with a concave ring part, and the guide sealing assembly 3 is limited between the convex ring part and the stopper to prevent its movement.

[0032] The piston rod assembly 2 includes a piston rod 21 and a piston 22 connected to the end of the piston rod 21. The piston 22 separates the oil chamber 12 into a first working chamber and a second working chamber. The first working chamber and the second working chamber are both filled with hydraulic oil. The piston 22 includes a narrow diameter section 221 and a wide diameter section 222. The narrow diameter section 221 and the wide diameter section 222 are coaxially arranged, and the diameter of the narrow diameter section 221 is smaller than the diameter of the wide diameter section 222. The wide diameter section 222 is in sealing contact with the inner wall surface of the cylinder 1, and there is a spacing space 121 between the narrow diameter section 221 and the inner wall surface of the cylinder 1. In this embodiment, the chamber between the piston 22 and the oil-gas separation assembly 5 is the first working chamber, and the chamber between the piston 22 and the guide seal assembly 3 is the second working chamber. The piston 22 includes a central channel 2201 extending axially therefrom and penetrating the end surface of the wide-diameter section 222, and a lateral channel 2202 extending through the narrow-diameter section 221, connecting the central channel 2201 with the spacing space 121. A release valve 23 is disposed within the central channel 2201 of the piston 22. The release valve 23 is movable within the piston 22 to switch between a connected state and a blocked state between the first and second working chambers.

[0033] In this embodiment, the piston rod 21 has a hollow cavity. The piston rod assembly 2 includes a push rod 24 disposed in the hollow cavity. The inner end of the push rod 24 abuts the release valve 23. The hollow cavity includes a limiting step. The inner end of the push rod 24 has a limiting protrusion 241 that cooperates with the limiting step to limit the return position of the push rod 24. The release valve 23 includes a sealing cone and a valve stem. The valve stem extends into the hollow cavity of the piston rod 21. Seals are provided between the sealing cone and the piston 22, and between the valve stem and the piston rod 21. A first seal 251 is provided between the sealing cone and the piston 22, and a second seal 252 is provided between the valve stem and the piston rod 21. The first seal 251 is configured to seal against the sealing cone of the release valve 23 in the blocking state, preventing the hydraulic oil in the first and second working chambers from communicating, thereby locking the movement of the piston rod assembly 2. The second sealing member 252 is used to always maintain the seal between the valve stem and the piston rod 21 to prevent the hydraulic oil from leaking from the hollow cavity of the piston rod 21 .

[0034] The assembly process of one embodiment of the stepless locking gas spring 100 provided by the application is as follows: the piston rod assembly 2, the guide sealing assembly 3 and the oil-gas separation assembly 5 are assembled in the cylinder 1, hydraulic oil is injected into the oil cavity 12; the inflation end cover 41 of the end cover assembly 4 is sealingly connected to the end of the cylinder 1, the inflation hole is in a communication state, gas is introduced into the gas cavity 11 through the inflation hole, and after the gas introduction is completed, the embedded part 43 is pressed into the inflation hole by an operating tool to block the inflation hole; the connecting end cover 42 is positioned on the inflation end cover 41 and is sealingly connected and fixed, and the assembly is completed.

[0035] In use, the top rod 24 is pressed to drive the release valve 23 to open, at this time, the first working cavity and the second working cavity of the oil cavity 12 are communicated through the lateral channel 2202 and the central channel 2201, and the piston rod assembly 2 can be stretched or compressed to move, in the stretching or compression movement process, the volume of the first working cavity and the second working cavity changes, and the hydraulic oil flows in the two working cavities; when the pressing force on the top rod 24 is removed, under the pressure of the high-pressure gas in the gas cavity 11, the oil-gas separation assembly 5 makes the release valve 23 reset to block the central channel 2201 by pressing the hydraulic oil in the first working cavity, at this time, since the piston rod assembly 2 cannot be stretched or compressed to move, the piston rod assembly 2 is locked. The gas spring provided by the application can be steplessly locked, that is, the piston rod assembly 2 can be locked at any position.

[0036] It can be known from the above description of the specific embodiments that the stepless locking gas spring 100 provided by the application, the end cover assembly 4 includes the inflation end cover 41 and the connecting end cover 42, the inflation end cover 41 is sealingly connected to the cylinder 1 and is provided with the inflation hole communicated with the gas cavity 11, the inflation hole is blocked by the embedded part 43, the connecting end cover 42 is connected to the inflation end cover 41, and a sealing cavity 401 surrounding the inflation hole is formed between the connecting end cover 42 and the inflation end cover 41, so that the embedded part 43 cooperates with the inflation hole to form the first sealing, the connecting end cover 42 and the inflation end cover 41 are connected to form the second sealing by the sealing cavity 401, the sealing effect of the inflation hole is improved, and the reliability of the product is enhanced; moreover, the connecting end cover 42 is connected to the inflation end cover 41 after blocking the inflation hole, and no related hole structure needs to be provided on the connecting end cover 42 to cooperate with the inflation hole, so that the connecting end cover 42 has better structural strength, and the reliability of the connection between the connecting end cover 42 and the external components is enhanced.

[0037] The application is described by several specific embodiments, and those skilled in the art should understand that various modifications and equivalent replacements can be made to the application without departing from the scope of the application. In addition, various modifications can be made to the application for specific situations or specific conditions without departing from the scope of the application. Therefore, the application is not limited to the specific embodiments disclosed, but should include all the embodiments falling within the scope of the claims of the application.

Claims

1. A continuously locking gas spring, characterized by, The cylinder includes a cylinder barrel, a piston rod assembly, an oil-gas separation assembly, a guide sealing assembly and an end cover assembly, the oil-gas separation assembly is sealingly arranged in the cylinder barrel, the guide sealing assembly and the end cover assembly are sealingly arranged at opposite ends of the cylinder barrel, a gas cavity is formed between the oil-gas separation assembly and the end cover assembly, an oil cavity is formed between the oil-gas separation assembly and the guide sealing assembly, the piston rod assembly is arranged in the oil cavity and has a piston rod extending out of the cylinder barrel from the guide sealing assembly, wherein the end cover assembly includes a gas charging end cover and a connecting end cover, the gas charging end cover is sealingly connected to the cylinder barrel and has a gas charging hole communicating with the gas cavity, the gas charging hole is blocked by an embedded piece, the connecting end cover is connected to the gas charging end cover and forms a sealing cavity around the gas charging hole between the gas charging end cover and the connecting end cover, and one end of the connecting end cover away from the gas charging end cover is provided with a connecting part adapted to be connected to an external component.

2. The continuously locked gas spring of claim 1, wherein, One end of the connecting end cover connected to the gas charging end cover is provided with a flange part, the flange part is sealingly connected to the gas charging end cover to form the sealing cavity on the inner side of the flange part.

3. The continuously locked gas spring of claim 2, wherein, The gas charging end cover is provided with a boss part around the gas charging hole, and the boss part and the flange part are inserted and matched with each other.

4. The continuously locking gas spring of any one of claims 1 to 3, wherein, The connecting part is one of a solid threaded column, a lifting ring with a circular hole and a U-shaped fork lifting lug with a connecting hole.

5. The continuously locked gas spring of claim 1, wherein, The embedded piece is a pin shaft which is interference fitted in the gas charging hole.

6. The continuously locked gas spring of claim 1, wherein, The piston rod assembly includes a piston connected to the end of the piston rod, the piston divides the oil cavity into a first working cavity and a second working cavity, the piston is provided with a release valve which can move in the piston to switch the first working cavity and the second working cavity between a communication state and a blocking state.

7. The continuously locked gas spring of claim 6, wherein, The piston rod has a hollow cavity, the piston rod assembly includes a jack rod arranged in the hollow cavity, and the inner side end of the jack rod abuts against the release valve.

8. The continuously locked gas spring of claim 7, wherein, The hollow cavity includes a limiting step part, and the inner side end of the jack rod has a limiting boss part matched with the limiting step part to limit the reset position of the jack rod.

9. The continuously locked gas spring of claim 7, wherein, The release valve includes a sealing cone part and a valve rod, the valve rod extends into the hollow cavity of the piston rod, and sealing pieces are arranged between the sealing cone part and the piston and between the valve rod and the piston rod, respectively.

10. The continuously locked gas spring of claim 7, wherein, The piston includes a narrow diameter section and a wide diameter section, the wide diameter section is in sealing contact with the inner wall surface of the cylinder barrel, and the narrow diameter section has a spacing space with the inner wall surface of the cylinder barrel, the piston includes a central channel along the axial direction and penetrating the end face of the wide diameter section, and a lateral channel on the narrow diameter section communicating with the central channel and the spacing space.

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