Long-stroke bidirectional rigid locking gas spring

Abstract

The utility model provides a long-stroke bidirectional rigid locking gas spring, which belongs to the technical field of gas springs and comprises a cylinder barrel, a first piston, an oil barrel, a first guide sleeve, a second piston and a second guide sleeve are sequentially arranged in the cylinder barrel from left to right, and a first flow cavity is formed between the first piston and the first guide sleeve. A first valve rod is arranged in the first piston, the periphery of the first valve rod is concavely arranged, a second flow cavity is formed between the inner periphery of the first piston, and a first flow channel communicated with the first flow cavity and the second flow cavity is further arranged on the periphery of the first valve rod. The gas spring provided by the utility model can be rigidly locked in two directions of stretching and compression (both the compression direction and the stretching direction are in an oil pressure state), is applied to a steering wheel adjusting column to adjust the working angle of a steering wheel, and can realize that the steering wheel is rigidly locked without obvious movement when the working angle is pulled and pressed; the piston rod and the second piston connected with the piston rod are located between the second guide sleeve and the first piston, and the second guide sleeve and the first piston are arranged at the two ends of the cylinder barrel respectively, so that the stroke of the piston rod is longer.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas springs, and in particular relates to a long-stroke bidirectional rigid locking gas spring. Background Art

[0002] The locking gas spring is a universal component that can be used for the steering wheel adjustment column to adjust the working angle of the steering wheel. Conventional locking gas springs are rigidly locked in only one direction (i.e., one direction, either the compression direction or the extension direction, is always in a gas pressure-maintaining state). This type of gas spring has non-rigid locking in one direction, and the locking force is insufficient, resulting in the steering wheel adjustment column having obvious movement and being unable to lock when the working angle is pulled or compressed. In addition, some locking gas springs also have the problem of short piston rod compression and extension stroke. Utility Model Content

[0003] The utility model aims to provide a long-stroke bidirectional rigid locking gas spring, characterized in that it comprises a cylinder and a piston rod, wherein a first piston, a second piston, an oil cylinder, a first guide sleeve and a second guide sleeve are arranged inside the cylinder, the first piston and the second guide sleeve are respectively located at two ends of the cylinder, and the outer circumferences of the opposite end portions are both concavely arranged, the two ends of the oil cylinder are respectively sleeved on the concave parts of the first piston and the second guide sleeve and fixed, one end of the piston rod is inserted into the cylinder and passes through the second guide sleeve to be connected with the second piston, the first guide platform is arranged on the outer circumference of the oil cylinder, and a first flow cavity is formed between the first guide sleeve and the first piston;

[0004] A first valve rod is provided inside the first piston, the outer circumference of the first valve rod is concavely arranged, and a second flow cavity is formed with the first piston, and a first flow channel connecting the second flow cavity and the first flow cavity is provided on the outer circumference of the first piston; one end of the first valve rod abuts against a first control rod for controlling the connection between the first flow channel and the flow cavity, and the other end extends into the oil cylinder and is connected to the end of the first piston, and the end of the control rod facing away from the first valve rod extends out of the cylinder;

[0005] A second valve rod is provided inside the second piston, and the outer periphery of the middle part of the second valve rod is concave, and a third flow cavity is formed between the second piston and the inner cavity of the second piston. A groove is provided inwardly on the outer periphery of the second piston extending into the inner part of the oil cylinder, and a fourth flow cavity is formed between the inner periphery of the oil cylinder. A second flow channel for connecting the fourth flow cavity and the third flow cavity is provided on the outer periphery of the second piston. One end of the second valve rod abuts against one end of a second control rod for controlling the connection between the second flow channel and the third flow cavity, and the other end extends into the inner part of the oil cylinder and is connected to the end of the second piston. The other end of the second control rod extends out from the end of the piston rod away from the second piston.

[0006] Furthermore, a W-shaped ring for sealing is provided on the inner periphery of the second guide sleeve, and the W-shaped ring is provided on the outer periphery of the piston rod.

[0007] Further, a counterbore is concaved at one end of the piston rod facing the second piston. One end of the second valve rod extends into the counterbore and abuts against the second control rod. A limiting rib is extended on the outer periphery of the end of the second control rod. The outer diameter of the rib is smaller than the inner diameter of the counterbore and larger than the diameter of the inner through hole of the second control rod.

[0008] Further, an air cavity is provided between the first guide sleeve and the second guide sleeve.

[0009] Further, O-ring seals for sealing are provided between the first piston and the inner periphery of the cylinder barrel, between the first piston and the oil cylinder, between the first guide sleeve and the oil cylinder, between the first guide sleeve and the cylinder barrel, between the outer peripheries on both sides of the concaved part of the first valve rod and the inner periphery of the first piston, between the outer peripheries on both sides of the concaved part of the second valve rod and the second piston, between the second piston and the oil cylinder, at the connection of the second guide sleeve and the oil cylinder, and between the second guide sleeve and the cylinder barrel.

[0010] Compared with the prior art, the beneficial effects of the present utility model are mainly reflected in:

[0011] 1. The gas spring provided by the present utility model can be rigidly locked in both the tensile and compressive directions (both the compression direction and the extension direction are in the oil pressure state), and is applied to the steering wheel adjustment column to adjust the working angle of the steering wheel, so that the steering wheel can be rigidly locked without obvious crosstalk when being pulled and pressed at the working angle.

[0012] 2. The present utility model arranges the piston rod and the connected second piston between the second guide sleeve and the first piston, and the second guide sleeve and the first piston are respectively arranged at both ends of the cylinder barrel, so that the stroke of the piston rod of the present utility model is longer. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 FIG. is a structural diagram of a long-stroke bidirectional rigid locking gas spring of the present utility model when it is fully extended.

[0014] Figure 2 FIG. is a structural diagram of a long-stroke bidirectional rigid locking gas spring of the present utility model when it is fully compressed.

[0015] Figure 3 FIG. is a partially enlarged view of the position of the first piston of the present utility model.

[0016] Figure 4 FIG. is a partially enlarged view of the position of the second piston of the present utility model.

[0017] Among them, 1. cylinder barrel; 2. first piston; 3. first guide sleeve; 4. second piston; 5. second guide sleeve; 6. piston rod; 7. first valve rod; 8. first control rod; 9. second valve rod; 10. second control rod; 11. first flow chamber; 12. first flow channel; 13. second flow chamber; 14. oil chamber; 15. fourth flow chamber; 16. second flow channel; 17. third flow chamber; 18. W-shaped sealing ring; 19. limit fixing part; 20. oil cylinder. Specific embodiments

[0018] The following will describe in more detail a long-stroke two-way rigid locking gas spring of the present invention with reference to the schematic diagrams, in which the preferred embodiments of the present invention are shown. 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 a broad guidance for those skilled in the art and not as a limitation to the present invention.

[0019] As Figures 1-4 shown, a long-stroke two-way rigid locking gas spring includes a cylinder barrel 1, and inside the cylinder barrel 1, there are successively arranged a first piston 2, an oil cylinder 20, a first guide sleeve 3, a second piston 4, a piston rod 6 and a second guide sleeve 5 from left to right. Among them, the first guide sleeve 3 is arranged on the outer periphery of the oil cylinder 20. The outer periphery of the right end of the first piston 2 and the outer periphery of the left end of the second guide sleeve 5 are both recessed inward to form a stepped structure, and the two stepped structures respectively extend into the two end parts of the oil cylinder 20 and are connected by docking with the inner walls of the two ends of the oil cylinder 20. The piston rod 6 is inserted into the cylinder barrel 1 from the right end of the cylinder barrel 1 and passes through the second guide sleeve 5 to be fixed to the right end of the second piston 4.

[0020] Specifically:

[0021] The cylinder barrel 1 forms a gas chamber and a first flow chamber 11 with its interior through the first guide sleeve 3. Among them, the gas chamber is located between the first guide sleeve 3 and the second guide sleeve 5, and the first flow chamber 11 is located between the first guide sleeve 3 and the first piston 2. The left side of the first piston 2 abuts against the left inner wall of the cylinder barrel 1, and the right side is connected to the oil cylinder 20. Inside the first piston 2, there are arranged a first valve rod 7 and a first control rod 8. The middle outer periphery of the first valve rod 7 is recessed to form a second flow chamber 13 between it and the inner periphery of the first piston 2. There is a first flow channel 12 on the outer periphery of the first piston 2 for communicating the first flow chamber 11 and the second flow chamber 13. The left end of the first valve rod 7 abuts against the first control rod 8, the right end of the first control rod 8 abuts against the left end of the first valve rod 7, and the right end of the first control rod 8 passes through the first piston 2 and extends out of the cylinder barrel 1 for manual extrusion to drive the first valve rod 7 to move to the right. The right end of the first valve rod 7 extends out of the right end of the first piston 2 and extends into the oil chamber 14 inside the oil cylinder 20, and gas spring oil is arranged in the oil chamber 14.

[0022] The outer periphery of the stepped structure of the second guide sleeve 5 is recessed with a groove, and a fourth flow cavity 15 is formed between the inner wall of the oil cylinder 20. A second valve rod 9 is provided inside the second piston 4. The middle part of the second valve rod 9 is also recessed and forms a third flow cavity 17 that is the same as the second flow cavity 13. A second flow channel 16 for communicating the third flow cavity 17 and the fourth flow cavity 15 is provided on the outer periphery of the second piston 4. A through hole is provided inside the piston rod 6. A counterbore is provided at the end of the piston rod 6 facing the second valve rod 9. A second control rod 10 is provided inside the counterbore. An extension edge extends outward from the outer periphery of the left end of the second control rod 10 for realizing the limit of the valve rod moving in the right direction. The end of the extension edge abuts against the right end of the valve rod. The right end of the second control rod 10 passes through the piston rod 6 and extends out of the right end of the piston rod 6 for manual extrusion to realize driving the second valve rod 9 to move in the left direction. The left end of the second valve rod 9 extends out of the left end of the second piston 4 and extends into the oil cavity 14 inside the oil cylinder 20.

[0023] In order to achieve the sealing between the chambers, O-ring seals are provided between the first piston 2 and the oil cylinder 20, between the first guide sleeve 3 and the oil cylinder 20, between the first guide sleeve 3 and the cylinder barrel 1, between the outer peripheries on both sides of the recessed part of the first valve rod 7 and the inner periphery of the first piston 2, between the outer peripheries on both sides of the recessed part of the second valve rod 9 and the second piston 4, between the second piston 4 and the oil cylinder 20, and at the connection of the second guide sleeve 5 and the oil cylinder 20. In order to achieve the sealing between the inside of the cylinder barrel 1 and the outside world, the same O-ring seals are provided between the first piston 2 and the inner periphery of the cylinder barrel 1 and between the second guide sleeve 5 and the cylinder barrel 1.

[0024] It should be noted that a limit fixing member 19 is also provided in the second flow cavity 13 for limiting and fixing the position of the O-ring seal provided between the outer peripheries on both sides of the recessed part of the first valve rod 7 and the inner periphery of the first piston 2 to prevent its horizontal movement.

[0025] Since the piston rod needs to move axially inside the oil cylinder 20, in order to strengthen the sealing between the long-stroke bidirectional rigid locking gas spring and the outside world, a W-shaped seal ring is also provided on the inner periphery of the second guide sleeve 5. The seal ring is provided on the outer periphery of the piston rod 6 to achieve the sealing of the gas spring oil that the piston rod 6 may carry on the outer periphery. Further, the number of the W-shaped seal rings 18 is set to two. The two W-shaped seal rings 18 are both provided on the inner periphery of the second guide sleeve 5 and are respectively provided near the left and right end faces thereof to achieve the effect of strengthening the sealing.

[0026] The working principle of the present utility model:

[0027] The original state is:

[0028] Reference Figure 1, the piston rod 6 fully extends. At this time, the second piston 4 is located at the rightmost end within the oil cylinder 20 and abuts against the left end of the second guide sleeve 5.

[0029] When compression is required:

[0030] Simultaneously squeeze the extended portions of the first control rod 8 and the second control rod 10, causing the first control rod 8 to drive the first valve rod 7 to move to the right and the second control rod 10 to drive the second valve rod 9 to move to the left. As a result, the O-ring seal on the right side of the concave portion of the first valve rod 7 and the O-ring seal on the left side of the concave portion of the second valve rod 9 lose their sealing effect, enabling the fourth flow chamber 15 to communicate with the first flow chamber 11. At this time, the second piston 4 and the piston rod 6 can move to the left under the action of pressure, and the gas spring oil flows from the first flow chamber 11 to the fourth flow chamber 15, achieving the compression of the piston rod 6.

[0031] When it is necessary to stop compression during the compression process:

[0032] Simultaneously release the first control rod 8 and the second control rod 10. Driven by the internal air pressure, the first valve rod 7 and the second valve rod 9 move to the left and right respectively to complete the reset. At this time, the O-ring seal on the right side of the concave portion of the first valve rod 7 and the O-ring seal on the left side of the concave portion of the second valve rod 9 respectively achieve the sealing effect between the oil chamber 14 and the second flow chamber 13 and the third flow chamber 17, making the first flow chamber 11 and the fourth flow chamber 15 no longer communicate. The second piston 4 and the piston rod 6 enter the locked state. Since both sides of the locked second piston 4 are gas spring oil (the left side is the gas spring oil in the oil chamber 14 and / or the first flow chamber 11, and the right side is the gas spring oil in the oil chamber 14 and / or the fourth flow chamber 15), it cannot be compressed, thus achieving two-way rigid locking. Figure 1 This is the state of the long-stroke two-way rigid locking gas spring of the present utility model when it is fully compressed.

[0033] When extension is required:

[0034] Similar to the compression process, simultaneously squeeze the extended portions of the first control rod 8 and the second control rod 10, enabling the fourth flow chamber 15 to communicate with the first flow chamber 11. At this time, the second piston 4 and the piston rod 6 can move to the right under the action of pressure, and the gas spring oil flows from the fourth flow chamber 15 to the first flow chamber 11, achieving the extension of the piston rod 6.

[0035] In the present utility model, since the first piston 2 and the second guide sleeve 5 are respectively arranged at the left and right ends of the cylinder barrel 1 and abut against the inner wall of the end of the cylinder barrel 1, the second piston 4 and the piston rod 6 can be compressed and extended between the first piston 2 and the second guide sleeve 5, achieving the maximum compression and extension distances, thus achieving the purpose and effect of a long stroke.

[0036] The above are only the preferred embodiments of the present utility model and do not impose any restrictive effect on the present utility model. Any person skilled in the relevant technical field, without departing from the technical solution of the present utility model, making any form of equivalent substitution or modification and other changes to the technical solution and technical content disclosed by the present utility model shall fall within the content of the technical solution of the present utility model and still be within the protection scope of the present utility model.

Claims

1. A long-stroke bidirectional rigid locking gas spring, characterized in that: It comprises a cylinder and a piston rod, wherein a first piston, a second piston, an oil cylinder, a first guide sleeve and a second guide sleeve are arranged inside the cylinder, wherein the first piston and the second guide sleeve are respectively located at two ends of the cylinder, and the outer circumferences of the opposite ends are both concavely arranged, and the two ends of the oil cylinder are respectively sleeved and fixed at the concave parts of the first piston and the second guide sleeve, wherein one end of the piston rod is inserted into the cylinder and passes through the second guide sleeve to be connected with the second piston, wherein the first guide sleeve is arranged on the outer circumference of the oil cylinder, and a first flow chamber is formed between the first guide sleeve and the first piston; A first valve rod is provided inside the first piston, the outer circumference of the first valve rod is concavely arranged, and a second flow cavity is formed with the first piston, and a first flow channel connecting the second flow cavity and the first flow cavity is provided on the outer circumference of the first piston; one end of the first valve rod abuts against a first control rod for controlling the connection between the first flow channel and the flow cavity, and the other end extends into the oil cylinder and is connected to the end of the first piston, and the end of the control rod facing away from the first valve rod extends out of the cylinder; A second valve rod is provided inside the second piston, and the outer periphery of the middle part of the second valve rod is concave, and a third flow chamber is formed between the second piston inner cavity, and the outer periphery of the second piston extending into the inner part of the oil cylinder is provided with a groove inwardly, and a fourth flow chamber is formed between the inner periphery of the oil cylinder, and a second flow channel for connecting the fourth flow chamber and the third flow chamber is provided on the outer periphery of the second piston, one end of the second valve rod abuts against one end of a second control rod for controlling the connection between the second flow channel and the third flow chamber, and the other end extends into the oil cylinder and is connected to the end of the second piston, and the other end of the second control rod extends out from the end of the piston rod away from the second piston.

2. The long-stroke bidirectional rigid locking gas spring according to claim 1, characterized in that: The inner periphery of the second guide sleeve is provided with a W-shaped ring for sealing, and the W-shaped ring is arranged on the outer periphery of the piston rod.

3. The long-stroke bidirectional rigid locking gas spring according to claim 1, characterized in that: The piston rod has a countersunk hole at one end thereof facing the second piston, one end of the second valve rod extends into the countersunk hole and abuts against the second control rod, and an extension for limiting is extended from the outer periphery of the end of the second control rod, and the outer diameter of the extension is smaller than the inner diameter of the countersunk hole and larger than the diameter of the through hole inside the second control rod.

4. The long-stroke bidirectional rigid locking gas spring according to claim 1, characterized in that: An air cavity is provided between the first guide sleeve and the second guide sleeve.

5. The long-stroke bidirectional rigid locking gas spring according to claim 1, characterized in that: O-rings for sealing are provided between the first piston and the inner periphery of the cylinder, between the first piston and the oil cylinder, between the first guide sleeve and the oil cylinder, between the first guide sleeve and the cylinder, between the outer peripheries on both sides of the concave setting of the first valve rod and the inner periphery of the first piston, between the outer peripheries on both sides of the concave setting of the second valve rod and the second piston, between the second piston and the oil cylinder, at the connection between the second guide sleeve and the oil cylinder, and between the second guide sleeve and the cylinder.

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