Double-rod stretching gas spring

Abstract

The utility model provides a double-rod stretching gas spring, which belongs to the technical field of gas springs and comprises a cylinder barrel, two guide sealing components are arranged in the cylinder barrel, a cavity is formed between the two sealing components and in the cylinder barrel, and a piston rod component is arranged in the cavity. The assembly comprises a first piston rod penetrating through one sealing assembly, a second piston rod penetrating through the other sealing assembly and two pistons connected with the two piston rods, the cavity is divided into a left cavity and a right cavity through the pistons, the left cavity and the right cavity are arranged in a sealed mode through an O-shaped ring, and the pistons are provided with channels communicating with the two cavities. Nitrogen and damping oil are injected into the cavity. The operating speed of the gas spring is controlled by controlling the channel of the piston, and the damping buffering effect at the tail end in the stretching or compressing direction can be improved by adding damping oil. The damping device can be applied to a pickup truck rear baffle, damping buffering can be achieved when the rear baffle falls down, and auxiliary force is achieved when the rear baffle is lifted up to reduce operation force of a lifting hand.

Description

Technical Field

[0001] This utility model belongs to the field of gas spring technology, and in particular relates to a double-rod tension gas spring. Background Technology

[0002] A tension gas spring is a common component. Conventional tension gas springs have a single piston rod assembly structure, where the cavities on both sides of the piston cannot circulate, resulting in no damping during the spring's movement. This means there is no damping or cushioning effect in either the compression or extension direction, causing noticeable impact and vibration in the rear bumper when it reaches its final position. This improved design increases service life and solves the problem in applications with high lateral forces. Summary of the Invention

[0003] The purpose of this utility model is to provide a double-rod tension gas spring, including a cylinder, with seals at both ends of the cylinder, and a piston rod assembly and a guide sealing assembly inside it. The guide sealing assembly is located on the outer periphery of the tail end of the piston rod assembly, and the head end of the piston rod assembly extends out of the head end of the cylinder and is connected to the external force-bearing structure. The tail end of the gas spring is fixed to other components of the external force-bearing structure.

[0004] The cylinder has a cavity formed by a guide sealing assembly. Nitrogen gas is injected into the cavity. The piston of the piston rod assembly separates the left and right chambers. The left chamber is close to the guide sealing assembly, and the right chamber is close to the beginning of the cylinder. The piston has a channel connecting the left and right chambers. The right chamber is filled with damping oil for buffering.

[0005] The piston rod assembly is driven by the pressure difference of nitrogen gas and external force to reciprocate inside the cavity, and damping oil is used to dampen and buffer the gas spring when it is fully stretched (when the heavy object or moving object reaches the end of the extension).

[0006] Furthermore, the first piston rod, the second piston rod, and the first and second pistons for connecting the ends of the two piston rods are provided with a channel in the second piston, and an O-ring for sealing is provided on the outer periphery of the second piston.

[0007] Furthermore, the guide sealing device includes a first guide sealing device and a second guide sealing device. The first guide sealing device is located in the middle of the cylinder and is disposed on the outer periphery of the first piston rod. The second guide sealing device is disposed inside the first end of the cylinder, and the first end of the second piston rod passes through the second guide sealing device.

[0008] Furthermore, the first guide sealing assembly includes a first guide sleeve, a first bushing, a first air seal, a first retaining sleeve, and a second air seal arranged in sequence; the second guide sealing assembly includes a third air seal, a second retaining sleeve, a fourth air seal, a second bushing, and a second guide sleeve arranged in sequence. A lower-spec dual-rod tension gas spring may have only one air seal at each end.

[0009] Furthermore, a fixed plug has an vent hole for releasing air.

[0010] Furthermore, the first piston is fixed to the first piston rod, and the second piston is fixed to the second piston rod. The first piston and the second piston are movably connected and can rotate freely.

[0011] Compared with the prior art, the beneficial effects of this utility model are mainly reflected in:

[0012] 1. A gas spring with a double piston rod is provided, in which the two chambers on both sides of the piston are interconnected. The operation of the gas spring is controlled by controlling the piston channel and the damping oil in the right chamber, which can increase damping in the stretching or compression direction (i.e., increase the damping buffering effect in the recompression or extension direction).

[0013] 2. Applying the double-rod tension gas spring of this utility model to the rear tailgate of a pickup truck can achieve damping and buffering when the tailgate falls, and auxiliary force to reduce the operating force of lifting the hand when it is raised. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a double-rod tension gas spring of this utility model when fully compressed.

[0015] Figure 2 This is a schematic diagram of the structure of a double-rod tension gas spring of this utility model when fully extended.

[0016] The components are as follows: 1. Cylinder; 2. Plug; 3. Inner cylinder; 4. First guide sleeve; 5. First bushing; 6. First air seal; 7. First retaining sleeve; 8. Second air seal; 9. First piston rod; 10. First piston; 11. Second piston rod; 12. Second piston; 13. O-ring; 14. Third air seal; 15. Second retaining sleeve; 16. Fourth air seal; 17. Second guide sleeve; 18. Second bushing; 19. Left chamber; 20. Right chamber; 21. Damping oil. Detailed Implementation

[0017] The following is a more detailed description of a double-rod tension gas spring according to the present invention, with reference to the schematic diagrams, which illustrate preferred embodiments of the present invention. It should be understood that those skilled in the art can modify the present invention described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the present invention.

[0018] This embodiment uses the rear tailgate of a pickup truck as an example to provide a detailed description of a double-bar tension gas spring.

[0019] like Figure 1 and 2As shown, a double-rod tension gas spring includes a cylinder 1, with a plug 2 at the tail end of the cylinder 1. The plug 2 has an exhaust port and is fixed to the side plate of a pickup truck. A first guide sealing assembly is provided in the middle of the cylinder 1. The cylinder 1 also has a piston rod assembly and a second guide sealing assembly. An inner cylinder 3 is provided between the first guide sealing assembly and the plug 1 to support and limit the first guide sealing assembly.

[0020] The first guide sealing assembly includes, from left to right, a first guide sleeve 4, a first bushing 5, a first air seal 6, a first retaining sleeve 7, and a second air seal 8.

[0021] The second guide sealing assembly includes a third air seal 14, a second retaining sleeve 15, a fourth air seal 16, a second bushing 18, and a second guide sleeve 17 arranged sequentially from left to right, wherein the second bushing 18 is disposed on the inner circumference of the second guide sleeve 17.

[0022] The piston rod assembly includes a first piston rod 9, a second piston rod 11, and a first piston 10 and a second piston 12 connecting the two piston rods. The first piston 10 is located on the inner circumference of the second piston 12, and an O-ring 13 for sealing is provided on the outer circumference of the second piston 12. A first guide sealing assembly is disposed on the outer circumference of the first piston rod 9, forming a cavity inside the cylinder 1 filled with nitrogen gas, and sealing the cavity while guiding the first piston rod 9 in linear motion. The first end of the second piston rod 11 passes through the second guide sealing assembly and extends out from the first end (right end) of the cylinder 1, and is fixed to the rear baffle of the pickup truck.

[0023] The first piston 10 and the second piston 12 are both located inside the cavity, dividing the cavity into a left chamber 19 and a right chamber 20. The left chamber 19 is located between the second piston 12 and the first guide sealing assembly, and the right chamber 20 is located between the second piston 12 and the second guide sealing assembly. The second piston 12 is provided with a channel connecting the left chamber 19 and the right chamber 20. Driven by nitrogen gas and manual operation, the piston rod assembly reciprocates in the left and right directions inside the cavity.

[0024] Located in the right chamber 20, damping oil 21 is also injected to achieve damping and buffering.

[0025] The operating principle of this utility model is as follows:

[0026] When the gas spring is installed, the first piston rod 11 faces downwards to ensure that the damping oil 21 is always at the bottom. When the pickup truck's rear tailgate falls, it drives the piston rod assembly to move. During this movement, the O-ring 13 seals against the right side of the second piston 12 and the inner wall of the cylinder 1. At this time, nitrogen and damping oil 21 can only flow through the through hole of the second piston 12. When the gas spring extends to its end, i.e., when the piston rod assembly is fully extended, the second piston 12 and the third air seal 14 contact and squeeze the damping oil 21, reducing the gas spring's operating speed and thus ensuring damping and buffering when the rear tailgate falls. Because the gas spring is filled with nitrogen pressure, the nitrogen pressure pushes the piston rod assembly to retract to the left. When the pickup truck's rear tailgate rises, the retraction force of the dual piston rod assembly assists in the upward movement, thus ensuring that there is an auxiliary force to reduce the lifting operation force when the rear tailgate rises.

[0027] The above are merely preferred embodiments of this utility model and do not constitute any limitation on this utility model. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and contents disclosed in this utility model without departing from the scope of the technical solutions of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A double-rod tension gas spring, characterized in that, The cylinder includes a cylinder barrel with seals at both ends. Inside the cylinder barrel are a piston rod assembly and a guide sealing assembly. The guide sealing assembly is located on the outer periphery of the tail end of the piston rod assembly, and the head end of the piston rod assembly extends out of the head end of the cylinder barrel. The cylinder has a cavity formed inside by a guide sealing assembly. Nitrogen gas is injected into the cavity, and the piston of the piston rod assembly separates the left and right chambers. The left chamber is close to the guide sealing assembly, and the right chamber is close to the beginning of the cylinder. The piston has a channel connecting the left and right chambers. The right chamber is filled with damping oil for buffering. The piston rod assembly is driven by the pressure difference of nitrogen gas and external force to reciprocate inside the cavity, and the damping oil provides damping buffer when the gas spring is fully stretched.

2. The double-rod tension gas spring according to claim 1, characterized in that, The piston rod assembly includes a first piston rod, a second piston rod, and a first piston and a second piston for connecting the ends of the two piston rods. The channel is provided in the second piston, and an O-ring for sealing is provided on the outer periphery of the second piston.

3. The double-rod tension gas spring according to claim 2, characterized in that, The guide sealing assembly includes a first guide sealing assembly and a second guide sealing assembly. The first guide sealing assembly is located in the middle of the cylinder and is disposed on the outer periphery of the first piston rod. The second guide sealing assembly is disposed inside the first end of the cylinder. The first end of the second piston rod passes through the second guide sealing assembly and extends out of the first end of the cylinder and is fixed to the external force-bearing structure. The end of the cylinder is fixed to other components of the external force-bearing structure.

4. The double-rod tension gas spring according to claim 3, characterized in that, The first guide sealing assembly includes a first guide sleeve, a first bushing, a first air seal, a first retaining sleeve, and a second air seal arranged in sequence; the second guide sealing assembly includes a third air seal, a second retaining sleeve, a fourth air seal, a second bushing, and a second guide sleeve arranged in sequence.

5. The double-rod tension gas spring according to claim 4, characterized in that, The cylinder barrel is provided with a plug at its tail end for fixing, and the plug has an exhaust hole for venting.

6. The double-rod tension gas spring according to claim 5, characterized in that, The first piston is fixed to the first piston rod, and the second piston is fixed to the second piston rod. The first piston and the second piston are movably connected.

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