Patent No.:CN205877051U Date:2016-08-11

Google Patent: https://patents.google.com/patent/CN205877051U/en?oq=CN205877051U

China Patent: http://epub.cnipa.gov.cn/

Abstract:

The utility model relates to a tension gas spring, which includes a cylinder, a piston rod installed inside the cylinder, and a piston located inside the cylinder. The piston is riveted to the right end of the piston rod. Additionally, the left end is hinged to a pull rod at the right end of the piston. There is a hinged ball head set at the left end of the pull rod, which is placed within the right stop port of the piston. In the right stop port of the piston, there is a snap ring groove and snap ring for the hinged ball head. This utility model is ingeniously conceived, with a reasonable design concept. It’s convenient to assemble without considering the linearity and concentricity of the connection between the piston rod and pull rod. Since it adopts a spherical loose connection, the piston rod and pull rod each follow their own guiding and sealing systems or components, resulting in a completely smooth and normal tension and shrink movement.

Description:

Technical Field: The utility model relates to a tension gas spring, suitable for tension or compression gas springs.

Background: Currently, the conventional tension or compression gas spring’s piston and piston rod are riveted through the piston. The tension gas spring presents difficulties in manufacturing, requiring high processing precision, strict assembly requirements, and uncertain return speed.

Content of the Utility Model: The technical problem to be solved by this utility model is to provide a traction gas spring with a reasonable design, compact structure, and easy use.

To solve the above problems, the technical scheme adopted by this utility model is: A traction gas spring, including a cylinder, a piston rod installed inside the cylinder, a piston located inside the cylinder, and a pull rod hinged at the right end of the piston, where the piston is installed at the right end of the piston rod.

As a further improvement of the above technical scheme: The piston is riveted to the right end of the piston rod. A hinged ball head is set at the left end of the pull rod, which is placed within the right stop port of the piston. The right stop port of the piston has a snap ring groove, and a snap ring is set within the groove for the hinged ball head. The piston is installed at the right end of the piston rod. At the right end of the piston rod, there is an annular intermediate shaft groove. At the right end of the annular intermediate shaft groove, there is a right shaft head. On the left side of the piston, there is a hooking head. The hooking head is fitted on the outer side wall of the right shaft head, with the hook part of the left end of the hooking head set within the annular intermediate shaft groove. A sealing guiding sleeve and right end cover are sealed within the cylinder. Between the sealing guiding sleeve and piston, there is a left chamber. Between the piston and right end cover, there is a right chamber. A left plug is sealed at the right end of the cylinder. The piston rod is sealed with the sealing guiding sleeve, and the right end cover is sealed with the pull rod. Inert gas is set within the left and right chambers. A limit tube is set between the left plug and sealing guiding sleeve. The limit tube is set inside the cylinder, with the piston rod axially movable inside the limit tube. There is a limit tube groove on the cylinder for axially positioning the limit tube. A sealing groove is set on the piston, with a sealing ring that seals with the inner side wall of the cylinder set within the sealing groove. Damping holes and vent holes are set on the piston, with a fitting clearance between the outer side wall of the piston and the inner side wall of the cylinder. The sealing groove is connected to the left chamber through the vent holes and to the right chamber through the damping holes. There is at least one vent hole, and one damping hole. The vent holes and damping holes are connected to the bottom of the sealing groove. A sealing ring that contacts and seals with the outer side wall of the pull rod is set within the right stop port of the right end cover. A pressure sleeve for pressing the sealing ring is set within the right stop port of the right end cover, with the pressure sleeve connected to the right stop port of the right end cover through threads. A left connector is set at the left end of the left plug, and a right connector is set at the right end of the pull rod.

Advantages of the Technical Scheme: The utility model is simple to produce, requiring low processing precision and low form and position tolerance requirements, with stable return speed. The original ordinary compression gas spring’s piston and piston rod are riveted through the piston. The piston and piston rod are tightly fitted with a hooking head to ensure the loose fit installation space of the pull rod, greatly reducing the assembly and production difficulty. The piston rod and pull rod are reverse installed into the cylinder, with the cylinder’s length extendable as needed, considering the sum of the actual traction stroke of the pull rod and the length of the right end cover. The utility model only requires consideration of the sealing and pull-out force of the pull rod exit, without needing to calculate the output force of the gas spring based on the area difference between the piston rod and pull rod. Since the piston and pull rod adopt a spherical loose connection, the right plane of the piston is completely in a sealed pressure environment, with the right side area of the piston calculated as a whole. The pull-out parameter value of the pull rod’s safety force is completed by the snap ring. The utility model is ingeniously conceived, with a reasonable design concept. It’s convenient to assemble without considering the linearity and concentricity of the connection between the components. Since it adopts a spherical loose connection pull, the piston rod and pull rod each follow their own guiding and sealing systems, resulting in a completely smooth and normal tension and shrink movement.

Drawings Description:

• Figure 1 is a schematic diagram of the structure of the utility model.
• Figure 2 is a schematic diagram of the structure of the piston of the utility model.

Components:

1. Cylinder
2. Piston rod
3. Pull rod
4. Right connector
5. Left plug
6. Left connector
7. Limit tube
8. Limit tube groove
9. Sealing guiding sleeve
10. Annular intermediate shaft groove
11. Right shaft head
12. Piston
13. Damping hole
14. Sealing groove
15. Vent hole
16. Fitting clearance
17. Hooking head
18. Hinged ball head
19. Snap ring
20. Right stop port
21. Right end cover
22. Pressure sleeve
23. Right chamber
24. Left chamber
25. Inert gas

Specific Implementation: As shown in Figures 1 and 2, the utility model includes cylinder 1, piston rod 2 installed inside cylinder 1, piston 12 located inside cylinder 1, and pull rod 3 hinged at the right end of piston 12. Piston 12 is installed at the right end of piston rod 2. The articulated connection reduces the manufacturing and assembly precision requirements between pull rod 3, piston 12, and piston rod 2, enhancing the flexibility of the utility model. The articulation is preferably a high-pair rotational movement.

As a preferred embodiment, piston 12 is riveted to the right end of piston rod 2.

More preferably, a hinged ball head 18 is set at the left end of pull rod 3, which is placed within the right stop port 20 of piston 12. The right stop port 20 of piston 12 has a snap ring groove, with snap ring 19 for the hinged ball head 18 set within the groove. The structure is compact, with the snap ring 19 providing easy and firm axial positioning.

Piston 12 is installed at the right end of piston rod 2. At the right end of piston rod 2, there is an annular intermediate shaft groove 10, with a right shaft head 11 at the right end of the annular intermediate shaft groove 10. On the left side of piston 12, there is a hooking head 17, which fits over the outer side wall of right shaft head 11. Preferably, the hooking head 17 is a transitional fit or interference fit, with the hook part of the left end of hooking head 17 set within the annular intermediate shaft groove 10. The hooking and interference fit assembly is easy to manufacture.

A sealing guiding sleeve 9 and right end cover 21 are sealed within cylinder 1. Between the sealing guiding sleeve 9 and piston 12, there is a left chamber 24. Between piston 12 and right end cover 21, there is a right chamber 23. A left plug 5 is sealed at the right end of cylinder 1. Piston rod 2 is sealed with sealing guiding sleeve 9, and right end cover 21 is sealed with pull rod 3. Inert gas 25 is set within the left and right chambers.

A limit tube 7 is set between left plug 5 and sealing guiding sleeve 9, positioned inside cylinder 1. Piston rod 2 moves axially inside limit tube 7. Cylinder 1 has a limit tube groove 8 for axially positioning limit tube 7, ensuring its stroke.

A sealing groove 14 is set on piston 12. Within sealing groove 14, there is a sealing ring that seals with the inner side wall of cylinder 1. Damping holes 13 and vent holes 15 are set on piston 12, with a fitting clearance 16 between the outer side wall of piston 12 and the inner side wall of cylinder 1. Sealing groove 14 connects to left chamber 24 through vent holes 15, and to right chamber 23 through damping holes 13.

There is at least one vent hole 15 and one damping hole 13. These settings ensure smooth and even movement of the gas spring.

The vent holes 15 and damping holes 13 are connected to the bottom of sealing groove 14.

A sealing ring that contacts and seals with the outer side wall of pull rod 3 is set within the right stop port of right end cover 21. A pressure sleeve 22 for pressing the sealing ring is set within the right stop port of right end cover 21, connected through threads. This makes pressing easy.

A left connector 6 is set at the left end of left plug 5, and a right connector 4 is set at the right end of pull rod 3.

Advantages: The utility model is simple to produce, requiring low processing precision and form and position tolerance requirements, with stable return speed. The original ordinary compression gas spring’s piston and piston rod are riveted through the piston. The piston 12 and piston rod 2 are tightly fitted with a hooking head, ensuring the loose fit installation space of pull rod 3. This greatly reduces assembly and production difficulty. The piston rod 2 and pull rod 3 are reverse installed into cylinder 1, with the cylinder’s length extendable as needed, considering the sum of the actual traction stroke of pull rod 3 and the length of right end cover 21.

The utility model only requires consideration of the sealing and pull-out force of pull rod 3 exit, without needing to calculate the gas spring’s output force based on the area difference between piston rod 2 and pull rod 3. The piston 12 and pull rod 3 adopt a spherical loose connection, making the right plane of piston 12 completely in a sealed pressure environment. The right side area of piston 12 is calculated as a whole. The pull-out parameter value of pull rod 3’s safety force is completed by snap ring 19.

The utility model is ingeniously conceived, with a reasonable design concept. It is convenient to assemble without considering the linearity and concentricity of the connection between the components. Since it adopts a spherical loose connection pull, piston rod 2 and pull rod 3 each follow their own guiding and sealing systems, resulting in a completely smooth and normal tension and shrink movement.

Finally, it should be noted: the above embodiments are only used to illustrate the technical scheme of the utility model, not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications can be made to the technical scheme described in the above embodiments, or some technical features can be replaced equivalently. The combination of multiple technical schemes of the utility model is obvious to those skilled in the art. These modifications or replacements do not depart from the spirit and scope of the technical scheme of the utility model.

Claims (10): – A Tension Gas Spring,  invented by LeiYan Gas Spring, a pioneer Chinese Gas Spring Manufacturer

1. A tension gas spring, characterized by comprising a cylinder (1), a piston rod (2) positioned inside the cylinder (1), a piston (12) positioned inside the cylinder (1), and a pull rod (3) hinged at the right end of the piston (12); the piston (12) is installed at the right end of the piston rod (2).
2. The traction gas spring according to claim 1, characterized in that the piston (12) is riveted at the right end of the piston rod (2).
3. The traction gas spring according to claim 1, characterized in that a hinged ball head (18) is set at the left end of the pull rod (3), the hinged ball head (18) is set within the right stop port (20) of the piston (12), and a snap ring groove is set within the right stop port (20) of the piston (12), with a snap ring (19) for the hinged ball head (18) set within the groove.
4. The traction gas spring according to claim 1, characterized in that the piston (12) is set at the right end of the piston rod (2). An annular intermediate shaft groove (10) is set at the right end of the piston rod (2), with a right shaft head (11) set at the right end of the annular intermediate shaft groove (10). On the left side of the piston (12), there is a hooking head (17); the hooking head (17) fits over the outer side wall of the right shaft head (11), with the hook part of the left end of the hooking head (17) set within the annular intermediate shaft groove (10).
5. The tension gas spring according to any of claims 1 to 4, characterized in that a sealing guiding sleeve (9) and a right end cover (21) are sealed within the cylinder (1). Between the sealing guiding sleeve (9) and the piston (12), there is a left chamber (24). Between the piston (12) and the right end cover (21), there is a right chamber (23). A left plug (5) is sealed at the right end of the cylinder (1). The piston rod (2) is sealed with the sealing guiding sleeve (9), and the right end cover (21) is sealed with the pull rod (3). Inert gas (25) is set within the left chamber (24) and the right chamber (23).
6. The tension gas spring according to claim 5, characterized in that a limit tube (7) is set between the left plug (5) and the sealing guiding sleeve (9), positioned inside the cylinder (1). The piston rod (2) moves axially inside the limit tube (7). A limit tube groove (8) is set on the cylinder (1) for axially positioning the limit tube (7).
7. The tension gas spring according to claim 6, characterized in that a sealing groove (14) is set on the piston (12). Within the sealing groove (14), there is a sealing ring that seals with the inner side wall of the cylinder (1). Damping holes (13) and vent holes (15) are set on the piston (12), with a fitting clearance (16) between the outer side wall of the piston (12) and the inner side wall of the cylinder (1); the sealing groove (14) connects to the left chamber (24) through the vent holes (15), and to the right chamber (23) through the damping holes (13).
8. The traction gas spring according to claim 7, characterized in that the vent holes (15) and damping holes (13) are connected to the bottom of the sealing groove (14); there is at least one vent hole (15) and one damping hole (13).
9. The traction gas spring according to claim 8, characterized in that a sealing ring that contacts and seals with the outer side wall of the pull rod (3) is set within the right stop port of the right end cover (21). A pressure sleeve (22) for pressing the sealing ring is set within the right stop port of the right end cover (21), connected through threads.
10. The traction gas spring according to claim 9, characterized in that a left connector (6) is set at the left end of the left plug (5), and a right connector (4) is set at the right end of the pull rod (3).