Bidirectional rigid locking gas spring

Abstract

The utility model provides a bidirectional rigid locking gas spring, which belongs to the technical field of gas springs and comprises a cylinder barrel, a piston rod component is arranged in the cylinder barrel and comprises a piston, a second piston rod and a first piston rod, the tail end of the first piston rod extends out of the right end of the cylinder barrel, the lining is located in the piston, the spring is located in the lining, the valve rod abuts against the right end of the spring, the control rod is located in the first piston rod and abuts against the right end of the valve rod, the valve rod is concaved inwards to form a flowing cavity, and an air cavity and an oil cavity are formed in the cylinder barrel through a second sealing piece. The oil cavities comprise the first oil cavity and the second oil cavity which are located on the left side and the right side of the piston respectively, the periphery of the piston is provided with a first channel and a second channel, the periphery of the bush is provided with a third channel, and the control rod is used for driving the valve rod to move and controlling the flowing cavity to be communicated with the third channel in cooperation with the spring so as to control the first oil cavity to be communicated with the second oil cavity. When the first oil cavity and the second oil cavity are not communicated, compression cannot be carried out due to the fact that gas spring oil exists on the two sides of the piston, and therefore two-way rigid locking is achieved. 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.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas springs, and particularly relates to a two-way rigid locking gas spring. Background Art

[0002] The locking gas spring is a general component, which can be used to adjust the working angle of the steering wheel on the steering wheel adjusting column. The conventional locking gas spring only has one-way rigid locking (that is, there is always one direction in the compression direction or the extension direction in a gas pressure maintaining state). Such a gas spring has the problem that one of the directions is non-rigidly locked, and the locking force is insufficient, resulting in obvious crosstalk and inability to lock when the steering wheel adjusting column is pulled or pressed at the working angle. Content of the Utility Model

[0003] The purpose of the utility model is to provide a two-way rigid locking gas spring, which is characterized in that it includes a cylinder barrel, one end of the cylinder barrel is sealed by a plug, and the other end is inserted with a piston rod assembly;

[0004] The piston rod assembly is arranged inside the cylinder barrel, and it includes a piston. The outer periphery of the middle part of the piston is movably connected with the cylinder barrel. Inside the cylinder barrel, a first oil chamber and a second oil chamber are respectively formed at both ends of the piston. A first seal for sealing between the two oil chambers is arranged on the outer periphery of the middle part of the piston. On both sides of the seal, a first channel and a second channel respectively communicating with the first oil chamber and the second oil chamber are arranged on the outer periphery of the piston. A valve rod is arranged inside the piston. The outer periphery of the middle part of the valve rod is concave, and a flow chamber is formed inside the piston. A first piston rod is fixed at one end of the piston facing away from the plug. One end of the first piston rod is fixed to the piston, and the other end extends out of the cylinder barrel. A control rod for controlling the flow chamber to communicate with both the first channel and the second channel at the same time is arranged inside the first piston. One end of the control rod abuts against the valve rod, and the other end extends out of the end of the first piston rod;

[0005] An air chamber is further arranged inside the cylinder barrel. The air chamber is closely arranged against the plug and is adjacent to the first oil chamber. A second seal for sealing between the air chamber and the oil chamber is arranged between the air chamber and the oil chamber;

[0006] A second piston rod is fixed at the end of the piston facing the plug. One end of the second piston rod is fixed to the piston, and the other end passes through the second seal and extends into the air chamber. A spring for driving the valve rod to reset is further arranged between the second piston rod and the piston.

[0007] Further, a bushing is arranged on the outer periphery of the spring, and a flow channel through hole for communicating the first channel and the flow chamber is arranged on the outer periphery of the bushing.

[0008] Further, a support plate is fixed at one end of the valve rod facing the spring. The diameter of the support plate is greater than or equal to the outer diameter of the spring and less than or equal to the inner diameter of the bushing. One end of the valve rod abuts against the spring through the support plate, and the other end abuts against the control rod.

[0009] Further, a third seal is provided on the outer periphery of the first piston rod located on the inner periphery of the cylinder barrel, and the third seal is provided between the piston and the end of the cylinder barrel away from the plug.

[0010] Further, both the second seal and the third seal are W-shaped rings. Two first guide sleeves and second guide sleeves for supporting and guiding the first piston rod and the second piston rod are respectively fitted with the two W-shaped rings, and the two guide sleeves are respectively arranged between the inner wall of the cylinder barrel and the two piston rods.

[0011] Further, a limit groove for restricting the moving distance of the piston and preventing the end of the piston from directly colliding with the W-shaped ring is provided inside the cylinder barrel between the second seal and the piston.

[0012] Further, O-rings are provided on the outer periphery of the valve rod, and the outer and inner peripheries of the second guide sleeve on both sides of the flow chamber.

[0013] Further, when the end of the control rod located outside is squeezed, the valve rod moves towards the spring and squeezes the spring, and the first oil chamber, the flow chamber and the second oil chamber communicate with each other, and the piston rod assembly realizes displacement based on the pressure difference;

[0014] When the end of the control rod located outside is released, the valve rod moves towards the control rod direction under the spring return stress and squeezes the control rod to realize the reset of the control rod. The first oil chamber, the flow chamber and the second oil chamber are sealed, and there is gas spring oil at both ends of the piston, and the piston rod assembly enters the two-way locking state.

[0015] Compared with the prior art, the beneficial effects of the present utility model are mainly reflected in that: the gas spring provided by the present utility model can be rigidly locked in both the stretching and compression 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, and the steering wheel can be rigidly locked without obvious crosstalk when being pulled and pressed at the working angle. Description of the Drawings

[0016] Figure 1 This is the fully extended state of a two-way rigid locking gas spring of the present utility model.

[0017] Figure 2 This is the fully compressed state of a two-way rigid locking gas spring of the present utility model.

[0018] Figure 3 This is a partial enlarged view of the inside of a two-way rigid locking gas spring after being locked during compression or extension of the present utility model.

[0019] Figure 4 This is a partial enlarged view of the inside of a two-way rigid locking gas spring during compression.

[0020] Figure 5Internal partial enlarged view of a bi-directional rigid locking gas spring during stretching.

[0021] Figure 6 Schematic structural view of a valve rod in a bi-directional rigid locking gas spring of the present utility model.

[0022] Wherein, 1. cylinder barrel; 2. plug; 3. gas chamber; 4. first guide sleeve; 5. first W-shaped ring; 6. first oil chamber; 7. second oil chamber; 8. second W-shaped ring; 9. second guide sleeve; 10. piston; 11. valve rod; 12. spring; 13. bushing; 14. first piston rod; 15. second piston rod; 16. control rod; 17. flow chamber; 18. first channel; 19, second channel; 20. third channel; 21. limit groove; 22. support plate. Specific embodiments

[0023] The following will describe in more detail a bi-directional rigid locking gas spring of the present utility model with reference to the schematic diagrams, in which the preferred embodiments of the present utility model are shown. It should be understood that those skilled in the art can modify the present utility model described herein while still achieving the advantageous effects of the present utility model. 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 utility model.

[0024] As Figures 1-3 shown, a bi-directional rigid locking gas spring 12 includes a cylinder barrel 1, a plug 2, a first guide sleeve 4, a second guide sleeve 9, a second seal, a third seal, two limit grooves 21 and a piston rod assembly.

[0025] A gas chamber 3, a first oil chamber 6 and a second oil chamber 7 are provided inside the cylinder barrel 1. The plug 2 is sealingly arranged at the left end of the cylinder barrel 1, and the right end of the cylinder barrel 1 is closed and provided with a through hole. Inside the cylinder barrel 1, the gas chamber 3, the second guide sleeve 9, the second W-shaped ring 8, the limit groove 21, the first oil chamber 6, the second oil chamber 7, the limit groove 21, the first W-shaped ring 5, and the first guide sleeve 4 are arranged in sequence. Among them, the first guide sleeve 4 abuts against the inner wall of the right end of the cylinder barrel 1.

[0026] Referring to Figure 6 , the piston rod assembly includes a piston 10, a valve rod 11, a spring 12, a bushing 13, a first piston rod 14 and a second piston rod 15. Among them, the first piston rod 14 and the second piston rod 15 are respectively fixed to the right and left ends of the piston 10. Among them, the right end of the first piston rod 14 sequentially passes through the first W-shaped ring 5 and the first guide sleeve 4 and extends out from the right end of the cylinder barrel 1; the left end of the second piston rod 15 sequentially passes through the second W-shaped ring 8 and the second guide sleeve 9 and extends out. The two guide sleeves respectively provide support and guidance for the two piston rods. The first W-shaped ring 5 and the second W-shaped ring 8 respectively achieve the sealing between the second oil chamber 7 and between the first oil chamber 6 and the gas chamber 3.

[0027] The middle outer periphery of the piston 10 extends outward and abuts against the inner wall of the cylinder barrel 1, thereby forming the above-mentioned first oil chamber 6 and second oil chamber 7. The middle of the piston 10 is provided with a through hole, and its two ends are respectively fixed to the first piston rod 14 and the second piston rod 15. The valve rod 11 is arranged at the middle position inside the piston 10, and its middle outer periphery is concave, and a flow chamber 17 is formed between it and the inner wall of the piston 10. On the left and right sides of the middle extension position of the piston 10, the outer periphery of the piston 10 is respectively provided with a first channel 18 and a second channel 19 communicating with the inside. The bushing 13 is arranged inside the piston, and a third channel 20 communicating with the first channel 18 is provided on its outer periphery, and the third channel 20 can communicate with the flow chamber 17. The spring 12 is arranged inside the bushing 13, its left end abuts against the right end of the second piston rod 15, and its right end abuts against the left end of the valve rod 11. The right end of the valve rod 11 abuts against the left end of the control rod 16 arranged inside the first piston rod 14, and the right end of the control rod 16 passes through the first piston rod 14 and extends out of the right end of the first piston rod 14.

[0028] Oil chambers are arranged on both the left and right sides of the piston 10. By driving the valve rod 11 to move through the control rod 16, the first oil chamber 6 and the second oil chamber 7 are communicated. Based on the pressure difference on both sides of the piston 10, the piston 10 moves back and forth in the two oil chambers between the two limit grooves 21, thereby realizing the extension and retraction of the first piston rod 14.

[0029] A seal, namely an O-ring, is arranged between the inner periphery of the piston, the second through hole and the third through hole. The inner periphery of the seal abuts against the outer periphery of the valve rod 11 under static conditions, realizing the seal between the flow chamber 17 and the third channel 20.

[0030] At the same time, seals, namely O-rings, are also provided on the outer periphery of the second guide sleeve 9 and the inner periphery of the left end face of the first piston rod 14.

[0031] It should be noted that there are no specific regional restrictions on the above-mentioned first oil chamber 6 and second oil chamber 7, which are defined as: the first oil chamber 6 is the oil chamber on the left side of the piston 10, and the second oil chamber 7 is on the right side of the piston 10.

[0032] The extension and retraction of the first piston rod 14 of the present utility model are specifically as follows:

[0033] Refer to Figure 4, when the first piston rod 14 is fully extended and needs to retract, the end of the control rod 16 is squeezed, causing the valve rod 11 to move towards the spring 12 and compress the spring 12. At this time, the flow chamber 17 is simultaneously connected to the second channel 19 and the third channel 20, thereby realizing the connection between the first oil chamber 6, the first channel 18, the third channel 20, the flow chamber 17, the second channel 19, and the second oil chamber 7, and the piston rod assembly enters the unlocked state. At this time, the gas spring 12 oil in the first oil chamber 6 flows to the second oil chamber 7, and based on the pressure difference on both sides of the piston 10, the piston rod assembly moves into the cylinder 1, realizing the retraction of the first piston rod 14. When it is necessary to stop, the control rod 16 is released, and the valve rod 11 moves towards the first piston rod 14 under the return squeezing pressure of the spring 12 and squeezes the control rod 16. At this time, the inner circumference of the O-ring abuts against the outer circumference of the valve rod 11, realizing the disconnection between the flow chamber 17 and the third through hole, resulting in the disconnection between the first oil chamber 6 and the second oil chamber 7, and the piston rod assembly enters the locked state. Since both sides of the piston 10 are gas spring 12 oil after locking and cannot be compressed, two-way rigid locking is achieved.

[0034] Similarly, referring to Figure 5 , when the first piston rod 14 is fully retracted and needs to extend, the end of the control rod 16 is squeezed, causing the valve rod 11 to move towards the spring 12 and compress the spring 12. At this time, the flow chamber 17 is simultaneously connected to the second channel 19 and the third channel 20, thereby realizing the connection between the first oil chamber 6, the first channel 18, the third channel 20, the flow chamber 17, the second channel 19, and the second oil chamber 7, and the piston rod assembly enters the unlocked state. At this time, the gas spring 12 oil in the second oil chamber 7 flows to the first oil chamber 6, and based on the pressure difference on both sides of the piston 10, the piston rod assembly moves towards the right end of the cylinder 1, realizing the extension of the first piston rod 14. When it is necessary to stop, the control rod 16 is released, and the valve rod 11 moves towards the first piston rod 14 under the return squeezing pressure of the spring 12 and squeezes the control rod 16. At this time, the inner circumference of the O-ring abuts against the outer circumference of the valve rod 11, realizing the disconnection between the flow chamber 17 and the third through hole, resulting in the disconnection between the first oil chamber 6 and the second oil chamber 7, and the piston rod assembly enters the locked state. Since both sides of the piston 10 are gas spring 12 oil after locking and cannot be compressed, two-way rigid locking is achieved.

[0035] Furthermore, we set a support plate 22 at the end of the valve rod 11 facing the spring 12. The outer diameter of the support plate 22 is not greater than the inner diameter of the bushing 13 and not less than the outer diameter of the spring 12.

[0036] A counterbore is recessed at the left end of the first piston rod 14. The left end of the control rod 16 extends outwards with a flange. The outer diameter of the flange is less than or equal to the inner diameter of the counterbore and greater than the diameter of its internal through hole, realizing the limitation of the control rod 16.

[0037] 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 scope of the technical solution of the present utility model, makes any form of equivalent replacement or modification and other changes to the technical solution and technical content disclosed by the present utility model, which all belong to the content within the scope of the technical solution of the present utility model and still fall within the protection scope of the present utility model.

Claims

1. A bidirectional rigid locking gas spring, characterized in that: It comprises a cylinder barrel, one end of which is sealed by a plug and the other end of which is inserted with a piston rod assembly; The piston rod assembly is arranged inside the cylinder, and comprises a piston, the middle outer periphery of the piston is movably connected with the cylinder, a first oil chamber and a second oil chamber are respectively formed at two ends of the piston inside the cylinder, a first sealing member for sealing between the two oil chambers is provided on the middle outer periphery of the piston, and is located on both sides of the sealing member, a first channel and a second channel are respectively connected to the first oil chamber and the second oil chamber on the outer periphery of the piston, a valve rod is provided inside the piston, the middle outer periphery of the valve rod is concavely arranged, and a flow chamber is formed inside the piston, a first piston rod is fixed to the end of the piston away from the plug, one end of the first piston rod is fixed to the piston, and the other end extends out of the cylinder, a control rod for controlling the flow chamber and connecting with the first channel and the second channel is provided inside the first piston, one end of the control rod abuts against the valve rod, and the other end extends out of the end of the first piston rod; The cylinder barrel is also provided with an air cavity, which is arranged close to the plug and adjacent to the first oil cavity, and a second sealing member for sealing the air cavity and the oil cavity is provided between the air cavity and the oil cavity; A second piston rod is fixed to one end of the piston facing the plug. One end of the second piston rod is fixed to the piston, and the other end passes through the second seal and extends into the air cavity. A spring for driving the valve rod to reset is also provided between the second piston rod and the piston.

2. The bidirectional rigid locking gas spring according to claim 1, characterized in that: A bushing is provided on the outer periphery of the spring, and a flow channel through hole for connecting the first channel and the flow cavity is provided on the outer periphery of the bushing.

3. The bidirectional rigid locking gas spring according to claim 2, characterized in that: A support plate is fixed to one end of the valve rod toward the spring, the diameter of the support plate is greater than or equal to the outer diameter of the spring and less than or equal to the inner diameter of the bushing, one end of the valve rod abuts against the spring through the support plate, and the other end abuts against the control rod.

4. The bidirectional rigid locking gas spring according to claim 1, characterized in that: Located at the inner periphery of the cylinder, a third sealing member is provided at the outer periphery of the first piston rod, and the third sealing member is provided between the piston and the end of the cylinder away from the plug.

5. The bidirectional rigid locking gas spring according to claim 1, characterized in that: The second seal and the third seal are both W-shaped rings, and the two W-shaped rings are respectively matched with a first guide sleeve and a second guide sleeve for supporting and guiding the first piston rod and the second piston rod, and the two guide sleeves are respectively arranged between the inner wall of the cylinder and the two piston rods.

6. The bidirectional rigid locking gas spring according to claim 1, characterized in that: Between the second seal and the third seal and the piston, and inside the cylinder, there are limit grooves for limiting the moving distance of the piston and preventing the end of the piston from directly colliding with the W-ring.

7. The bidirectional rigid locking gas spring according to claim 1, characterized in that: Located on both sides of the flow chamber, O-rings are provided on the outer periphery of the valve rod and the outer periphery and inner periphery of the second guide sleeve.

8. The bidirectional rigid locking gas spring according to claim 1, characterized in that: When the end of the control rod located outside is squeezed, the valve rod moves toward the spring and squeezes the spring, the first oil chamber, the flow chamber and the second oil chamber are connected to each other, and the piston rod assembly is displaced based on the pressure difference; When the end of the control rod located outside is released, the valve rod moves toward the control rod under the spring return stress and squeezes the control rod to reset the control rod. The first oil chamber, the flow chamber and the second oil chamber are sealed, and gas spring oil exists at both ends of the piston, and the piston rod assembly enters a two-way locking state.

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