Spiral damping buffer limiting hinge structure
By using a spiral damping buffer limiting hinge structure, the problems of collision noise and hinge breakage when the lid of a pulsator washing machine is closed are solved, and safe and reliable lid operation is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN HELIZHENG IND CO LTD
- Filing Date
- 2025-08-06
- Publication Date
- 2026-07-14
Smart Images
Figure CN224496131U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hinges, and in particular to a spiral damping buffer limiting hinge structure. Background Technology
[0002] In a top-loading washing machine, the lid is located on top of the machine body and is hinged to it. Opening and closing the door is done by manually lifting the lid. However, existing lids require manual placement onto the machine body to close. If the lid falls automatically without support, it collides with the machine body, producing a loud noise. Furthermore, due to the lack of a stop mechanism, the lid can open beyond the preset angle when opened, causing excessive stress on the hinge and potentially leading to hinge breakage. Utility Model Content
[0003] To address the aforementioned problems, this utility model provides a spiral damping buffer limiting hinge structure, which is installed between the cover and the body. It can automatically slow down the descent speed of the cover and play a limiting role to prevent the hinge from breaking.
[0004] The technical solution adopted in this utility model is as follows:
[0005] A helical damping buffer limiting hinge structure includes a housing connected to a cover and a rotating shaft connected to a body. The housing includes an outer shell and a mounting base disposed on one side of the outer shell. The outer shell has an outer shell cavity, one end of which is open and the other end has a mounting hole. The rotating shaft extends into the outer shell cavity, and its outer edge is sealed to the opening of the outer shell cavity, forming a sealed cavity between the rotating shaft and the outer shell cavity. The rotating shaft is rotatably connected to the outer shell cavity via a damper. The damper includes an adjusting needle, a one-way valve, and a helical slider that rotates synchronously with the outer shell. The helical slider is helically connected to the rotating shaft and moves along an axis within the outer shell, separating the sealed cavity. The system comprises a first cavity and a second cavity, with the second cavity located closer to the axis of rotation. Damping fluid is contained within both the first and second cavities. An oil passage hole connecting the first and second cavities is provided on the spiral slider. An adjusting needle is inserted into the outer shell cavity through a mounting hole at the other end of the outer shell. The adjusting needle includes a needle tip that mates with the mounting hole and a needle body inserted into the outer shell cavity. The needle body is tapered and mates with a one-way valve in the oil passage hole. A first oil passage is formed between the valve body of the one-way valve and the oil passage hole, and a second oil passage is formed between the valve hole of the one-way valve and the adjusting needle. An oil outlet hole and an oil flow channel communicating with the oil passage hole and the second cavity are provided on the side wall of the spiral slider.
[0006] Preferably, at least one inner slide is formed on the inner wall of the second cavity in the outer shell cavity, and at least one outer protrusion is formed on the outer wall of the spiral slider to cooperate with the inner slide, and at least one oil groove is formed on each outer protrusion; a first step for limiting the spiral slider is formed between the first cavity and the second cavity.
[0007] Preferably, the spiral slider has a slider cavity, which is divided into a placement cavity at the front end and a spiral inner cavity at the rear end that cooperates with the rotating shaft. The inner wall of the spiral inner cavity has a spiral groove, and the placement cavity has a boss that divides the placement cavity into a front connecting cavity and a rear connecting cavity. The rear connecting cavity communicates with the spiral inner cavity and the oil flow channel. An oil passage hole is provided on the boss. The rotating shaft has a spiral protrusion that cooperates with the spiral groove. The one-way valve includes a valve body and a valve seat located on one side of the valve body. The diameter of the valve seat is larger than the diameter of the valve body. The valve seat is located in the front connecting cavity and cooperates with the boss. The valve body of the one-way valve is inserted into the oil passage hole. The valve body has a valve hole that cooperates with the needle body of the adjusting needle.
[0008] Preferably, the rotating shaft is provided with an insert, and the rotating shaft includes an outer shaft, a connecting shaft and an inner shaft connected in sequence. The connecting shaft is sealed to the outer cavity of the outer shell, and a second step is formed between the connecting shaft and the inner shaft for limiting the position of the spiral slider. The inner shaft is provided with a spiral protrusion connected to the spiral slider.
[0009] Preferably, a first sealing ring is provided between the spiral slider and the second cavity, and a second sealing ring is provided between the connecting shaft and the first cavity; an end cap for sealing the opening of the outer cavity of the outer shell is fitted on the connecting shaft.
[0010] Preferably, the first cavity is further provided with a spring fitted onto the adjusting needle.
[0011] More preferably, the needle body of the adjusting needle is a tapered needle body; the needle tip of the adjusting needle includes a head and a threaded part, the threaded part connects the head and the needle body, and the other end of the outer shell is provided with an installation channel communicating with the mounting hole, and the threaded part is threadedly connected to the installation channel in the outer shell.
[0012] Preferably, the rotation angle between the outer shell and the rotating shaft is -10 to 100 degrees.
[0013] Preferably, the mounting base of the housing is provided with mounting holes for installation, a first mounting platform is formed on the outer shell, a second mounting platform is formed on the rotating shaft, and a positioning groove is also provided on the second mounting platform.
[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a spiral damping buffer limiting hinge structure. When the cover rotates, it drives the spiral slider inside the damper to squeeze the first cavity or the second cavity. The oil flow channel on the side wall of the spiral slider connects the second cavity and the oil passage. During the opening of the cover, the damping fluid passes through the wide first oil passage, while when the cover is closed, the damping fluid passes through the narrow second oil passage. This does not affect the opening of the cover, but slows down the descent speed of the cover and avoids collision noise. It also plays a limiting role, restricting the opening angle of the cover from exceeding the preset angle, which is safe and reliable. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of a helical damping buffer limiting hinge structure according to the present invention. Figure 1 .
[0016] Figure 2 This is a schematic diagram of a helical damping buffer limiting hinge structure according to the present invention. Figure 2 .
[0017] Figure 3 This is an exploded view of a spiral damping buffer limiting hinge structure according to this utility model.
[0018] Figure 4 This is a schematic diagram of the shell in a spiral damping buffer limiting hinge structure according to the present invention.
[0019] Figure 5 This is a schematic diagram of the helical slider in a helical damping buffer limiting hinge structure of this utility model. Figure 1 .
[0020] Figure 6 This is a schematic diagram of the helical slider in a helical damping buffer limiting hinge structure of this utility model. Figure 2 .
[0021] Figure 7 This is a schematic diagram of a one-way valve in a spiral damping buffer limiting hinge structure of this utility model.
[0022] Figure 8 This is a schematic diagram of the adjusting pin in a spiral damping buffer limiting hinge structure of this utility model.
[0023] Figure 9 A cross-sectional view of a spiral damping buffer limiting hinge structure provided by this utility model in the -10 degree open state.
[0024] Figure 10 A cross-sectional view of a spiral damping buffer limiting hinge structure provided by this utility model in the 0-degree open state.
[0025] Figure 11 The diagram shows a closed section of a helical damping buffer limiting hinge structure provided by the present invention in the 100-degree state. Detailed Implementation
[0026] The preferred embodiments of this utility model will be described in detail with reference to the accompanying drawings.
[0027] Figures 1 to 11 This is a preferred embodiment of a helical damping buffer limiting hinge structure provided by this utility model. For example... Figures 1 to 11As shown, the spiral damping buffer limiting hinge structure includes a housing 10 connected to the cover and a rotating shaft 20 connected to the body. The housing 10 includes an outer shell 11 and a mounting base 12 disposed on one side of the outer shell. The outer shell 11 has an outer shell cavity 111, with an opening at one end and a mounting hole 112 at the other end. The rotating shaft 20 extends into the outer shell cavity, and the outer edge of the rotating shaft is sealed to the opening of the outer shell cavity 111, forming a sealed cavity between the rotating shaft 20 and the outer shell cavity 111. The rotating shaft 20 rotates with the outer shell cavity through a damper 30. The damper 30 includes an adjusting needle 31, a one-way valve 32, and a spiral slider 33 that rotates synchronously with the housing 11. The spiral slider 33 is spirally connected to the rotating shaft and moves along the axis. The spiral slider 33 divides the sealed cavity into a first cavity 1101 and a second cavity 1102. The second cavity 1102 is closer to the rotating shaft. Damping fluid is provided in both the first cavity 1101 and the second cavity 1102. The spiral slider 33 has an oil passage 331 that connects the first cavity 1101 and the second cavity 1102. The adjusting needle 31... The adjusting needle 31 is inserted into the housing cavity through the mounting hole 112 at the other end of the housing 11. The adjusting needle 31 includes a needle tip 311 that mates with the mounting hole and a needle body 312 inserted into the housing cavity. The needle body 312 is tapered and mates with the one-way valve 32 inside the oil passage 331. A first oil passage 301 is formed between the valve body of the one-way valve 32 and the oil passage 331, and a second oil passage 302 is formed between the valve hole of the one-way valve 32 and the adjusting needle 31. The side wall of the spiral slider 33 is provided with a connection to the oil passage 331 and the second cavity 1102. Oil outlet 3301 and oil flow channel 3302; when the washing machine lid is opened or closed, it drives the housing 10 to rotate around the rotating shaft 20 on the machine body, thereby allowing damping fluid to flow between the first cavity 1101 and the second cavity 1102. Since the first oil passage 301, the second oil passage 302, the oil outlet 3301, and the oil flow channel 3302 are connected, the lid can be opened without obstruction and the descent speed of the lid can be slowed down, avoiding collision noise; at the same time, it reduces costs, reduces processing precision, and improves production efficiency. The relative rotation angle between the housing 10 and the rotating shaft 20 is -10 to 100 degrees.
[0028] like Figure 4 As shown, the mounting base 12 of the housing 10 is provided with at least one mounting hole 121 for installation. A first placement platform 1103 is formed on the outer shell 11. The housing 10 is inserted into the cover body. The first placement platform 1103 on the outer shell 11 ensures that the outer shell 11 is in the cover body and does not rotate arbitrarily. The mounting hole 121 is used for positioning to connect the housing 10 and the cover body into one body. The housing 10 and the cover body rotate synchronously. A second placement platform 2001 is formed on the rotating shaft 20. The second placement platform 2001 is also provided with a positioning groove 2002. The rotating shaft 20 is placed into the machine body. The second placement platform 2001 and the positioning groove 2002 limit the rotating shaft 20. When the cover body rotates, it drives the housing 10 to rotate around the rotating shaft 20.
[0029] At least one inner slide rail 11021 is formed on the inner wall of the second cavity 1102 in the outer shell cavity 111, and at least one outer protruding ridge 332 that mates with the inner slide rail is formed on the outer wall of the spiral slider 33. When the spiral slider 33 is inserted into the outer shell cavity, the outer protruding ridge 332 is located within the inner slide rail 11021, thereby driving the spiral slider 33 to rotate synchronously when the shell 10 and the cover rotate synchronously. Simultaneously, because the spiral slider 33 is spirally connected to the rotating shaft 20, it is restricted to moving only linearly along the axis, thus compressing the hydraulic oil in the first cavity 1101 or the second cavity 1102. Each outer protruding ridge 332 has at least one oil passage groove 3321 formed on it. When the spiral slider 33 moves, the damping fluid between the first cavity 1101 and the second cavity 1102 flows through the oil passage groove 3321 on the spiral slider 33. Figure 3 As shown, four inner slides 11021 are formed on the inner wall of the outer shell cavity. The four inner slides 11021 are distributed at a 90-degree angle around the central axis of the outer shell cavity. An inner convex ridge is formed between two adjacent inner slides 11021. Correspondingly, four outer convex ridges 332 are distributed on the outer wall of the spiral slider 33. The four outer convex ridges 332 are distributed at a 90-degree angle around the central axis of the spiral slider 33. An outer slide is formed between two adjacent outer convex ridges. During assembly, the four outer convex ridges 332 are placed into the corresponding four inner slides 11021. The inner convex ridges are located in the outer slides, so that the force is evenly distributed.
[0030] A first step 1104 is formed between the first cavity 1101 and the second cavity 1102 in the outer shell cavity 111 to limit the movement of the spiral slider 333. When the side of the spiral slider 333 contacts the first step 1104, it indicates that the spiral slider 333 has rotated to the maximum displacement position and the cover has been opened to the maximum angle, thereby playing a limiting role and preventing the hinge from breaking.
[0031] like Figures 5 to 6 As shown, the spiral slider 33 has a slider cavity 333, which is divided into a placement cavity 3331 at the front end and a spiral inner cavity 3332 at the rear end that cooperates with the rotating shaft 20. The inner wall of the spiral inner cavity 3332 has a spiral groove 33321. The placement cavity 3331 has a boss 334, which divides the placement cavity 3331 into a front connecting cavity 33311 and a rear connecting cavity 33312. The rear connecting cavity 33312 communicates with the spiral inner cavity 3332, the oil outlet 3301, and the oil flow channel 3302. The oil passage 331 is provided on the boss 334. The rotating shaft 20 has a spiral protrusion 231 that cooperates with the spiral groove 33321.
[0032] The one-way valve 32 includes a valve body 321 and a valve seat 322 located on one side of the valve body. The diameter of the valve seat 322 is larger than the diameter of the valve body 321. The valve seat 322 is located in the front connecting cavity 33311 and cooperates with the boss 334. The valve body 321 of the one-way valve is inserted into the oil passage 331. The valve body 321 is provided with a valve hole 323 that cooperates with the needle body of the adjusting needle. In this way, the damping fluid in the second cavity 1102 flows into the rear connecting cavity 33312 through the oil outlet 3301 and the oil flow channel 3302. When the damping fluid in the rear connecting cavity 33312 flows towards the first cavity 1101, the damping fluid pushes the valve seat 322 of the one-way valve 32 away from the boss 334. A gap is left between the valve seat 322 and the boss 334, thus forming a first oil passage 301 between the valve body 321 and the inner wall of the oil passage 331. However, due to the conical shape of the needle body 312, the gap between the valve body 321 and the needle body 312 of the one-way valve 32 becomes smaller, and the second oil passage 302 also becomes very narrow, allowing very little damping fluid to pass through. When the damping fluid in the first cavity 1101 flows to the second cavity 1102, the damping fluid pushes the valve seat 322 of the one-way valve 32 closer to the boss 334, and the gap between the valve seat 322 and the boss 334 of the one-way valve 32 gradually decreases until the first oil passage 301 is closed. Meanwhile, the gap between the valve body 321 and the needle body 312 of the one-way valve 32 gradually increases, and the valve hole 323 of the one-way valve 32 and the needle body 312 form the second oil passage 302. It is worth noting that an oil outlet 3301, an oil flow channel 3302, and multiple oil passage grooves 3321 are formed on the side wall of the spiral slider 33, which are connected to the rear connecting cavity 33312. This allows the second cavity 1102 to be connected to the oil passage 331. Compared with the previously designed oil passage 331, which flows directly from the spiral inner cavity into the second cavity 1102, this can significantly accelerate the flow rate of the damping fluid, reduce machining accuracy, and improve production efficiency.
[0033] like Figure 3 As shown, the rotating shaft 20 includes an outer shaft 21, a connecting shaft 22, and an inner shaft 23 connected in sequence. The connecting shaft 22 is sealed to the second cavity 1102. A second step 221 is formed between the connecting shaft 22 and the inner shaft 23 to limit the position of the spiral slider 33. The inner shaft 23 is provided with a spiral protrusion 231 that is spirally connected to the spiral groove 33321 on the spiral slider 33. During assembly, the spiral slider 33 is placed into the outer shell cavity 111, and the spiral protrusion 231 on the inner shaft 23 cooperates with the spiral groove 33321 in the spiral slider 20. This positions the rotating shaft 20 and also seals the outer shell cavity 111. The distance between the first step 1104 and the second step 221 is the distance that the spiral slider 33 can move.
[0034] like Figure 9As shown, the rotating shaft 20 is provided with an insert 24. The function of the insert 24 is to increase the strength of the rotating shaft, thereby greatly increasing the tensile strength and shear strength of the rotating shaft. When the rotating shaft faces different stress or environmental requirements, the insert 24 can help increase the stress strength of the rotating shaft 20 and avoid jamming or failure caused by local deformation.
[0035] To maintain airtightness, a first sealing ring 335 is provided between the spiral slider 33 and the outer shell cavity 111, and a second sealing ring 26 is provided between the connecting shaft 22 and the outer shell cavity 111; and an end cap 25 for sealing the opening of the outer shell cavity 111 is fitted on the connecting shaft 22. Both the spiral slider 33 and the connecting shaft 22 are provided with sealing ring mounting grooves.
[0036] The first cavity 1101 is also equipped with a spring 34 sleeved on the adjusting needle 31. The spring 34 in the first cavity 1101 can reduce the torque. When the cover is closed, the spiral slider 33 slides into the first cavity 1101. The spiral slider 33 squeezes the damping fluid in the first cavity 1101 and the spring 34. At the beginning of the squeezing, the reaction force generated by the spring 34 is not large, and the spiral slider 33 can overcome the reaction force of the spring 34. When the squeezing is further, the reaction force generated by the spring 34 becomes larger and larger, which makes the movement speed of the spiral slider 33 slower and slower, thereby slowing down the closing speed of the cover and avoiding collision with the machine body when the cover is closed. When the cover is opened, due to the reaction force of the spring 34, the spiral slider 33 is pushed to move into the second cavity 1102, thereby reducing the lifting force that needs to be applied to the cover.
[0037] The adjusting needle 31 has a tapered needle body 312. The needle body 312 passes through the mounting hole 112 at the other end of the outer casing 11 and is inserted into the outer casing cavity. As the adjusting needle 31 moves closer to the second cavity 1102, the gap between it and the inner hole of the one-way valve 32 becomes smaller, and vice versa. That is, the torque of the damper 30 can be controlled by the left and right movement of the adjusting needle 31. The other end of the outer casing 11 has a mounting channel 113 communicating with the mounting hole 112. The needle tip 311 of the adjusting needle 31 is threadedly connected to the mounting channel 113, and the needle tip 311 is located within the mounting channel 113. This allows the adjusting needle 31 to be rotated from outside the outer casing 10, controlling its left and right movement as needed. The mounting channel 113 has an internal thread, and the needle tip 311 has an external thread that mates with the internal thread. To enhance sealing, a third sealing ring 313 is provided between the needle 311 and the installation channel 113, and a sealing ring placement groove is provided inside the needle 311.
[0038] When in use, the cover is in the -10 degree closed state. Opening the cover upwards causes the housing 10 to drive the spiral slider 33 to rotate synchronously. Since the spiral slider 33 is spirally connected to the inner shaft 23 on the rotating shaft 20, under the spiral pushing action and the reaction force of the spring 34, the spiral slider 33 moves towards the second cavity 1102, compressing the second cavity 1102, causing its volume to decrease and the first cavity 1101's volume to increase. Because the damping fluid cannot be compressed, when the spiral slider 33 moves towards the second cavity 1102, the damping fluid in the second cavity 1102 enters the rear connecting cavity 33312 through the oil groove 3321 and oil flow channel 3302 on the spiral slider 33. A small portion of the damping fluid in the rear connecting cavity 33312 flows back to the first cavity 1101 through the second oil passage 302, while most of the damping fluid impacts the one-way valve 32 through the oil passage 331, pushing the one-way valve 32. The valve seat 322 is far away from the boss 334. There is a gap between the valve seat 322 and the boss 334 of the one-way valve 32, so that the valve body 321 and the inner wall of the oil passage 331 form a first oil passage 301. The damping fluid flows back to the first cavity 1101 through the first oil passage 301. At the same time, since the needle body 312 is conical, the second oil passage 302 between the inner hole 323 of the one-way valve 32 and the needle body 312 becomes narrow during the retraction of the one-way valve 32. The faster the spiral slider 33 moves, the faster the damping fluid returns. Moreover, the gap of the first oil passage 301 is large, and the damping fluid can pass through easily. Thus, the entire damper 30 has no torque output, and the cover can be opened easily. When the housing 10 drives the spiral slider 33 to rotate to the 100° position, the spiral slider 33 moves to the maximum stroke position, one end of the spiral slider 33 contacts the second step 221, and the spiral slider 33 can no longer move. At this time, the cover opens to 100 degrees, which is the maximum opening angle. Figure 8 A schematic diagram showing the flow of damping fluid with the cover in the open state at -10 degrees Celsius. Figure 9 This is a schematic diagram showing the flow of damping fluid with the cover in a 0-degree open state.
[0039] like Figure 11As shown, when the cover is in the 100-degree open state and the cover is closed, the housing 10 drives the spiral slider 33 to rotate synchronously. Under the spiral pushing action, the spiral slider 33 moves towards the first cavity 1101. The spiral slider 33 squeezes the damping fluid and spring 34 in the first cavity 1101. A small portion of the damping fluid flows back through the first oil passage 301 and then into the connecting cavity 33312. The damping fluid in the connecting cavity 33312 then enters the second cavity 1102 through the oil outlet 3301, the oil passage 3302, and the oil groove 3321 on the side wall of the spiral slider 33. Most of the damping fluid pushes the one-way valve 32 into the oil passage 331, causing the first oil passage 301 to close, and the damping fluid cannot flow back to the second cavity 1102 through the first oil passage 301. And because the needle body 311 is in the shape of The conical, one-way valve 32 has a gap between its inner hole and the needle body 312, forming a second oil passage 302. The damping fluid cannot flow back to the second cavity 1102 through the first oil passage 301, so the damping fluid can only slowly flow into the rear connecting cavity 33312 from the second oil passage 302. The gap of the second oil passage 302 is smaller than that of the first oil passage 301, and an oil pressure difference is formed between the first cavity 1101 and the second cavity 1102, so the damper 30 outputs torque. At the same time, due to the compression spring 34, the resistance of the spring 34 needs to be overcome, thereby slowing down the descent speed of the cover and avoiding collision noise. When the housing 10 drives the spiral slider 33 to rotate to the -10 degree position, the other end of the spiral slider 33 contacts the first step 1104, and the spiral slider 33 can no longer move. At this time, the cover is in the -10 degree closed state.
[0040] In summary, the technical solution of this utility model can fully and effectively achieve the aforementioned objectives. Furthermore, the structure and functional principles of this utility model have been fully verified in the embodiments, achieving the expected effects and objectives. Without departing from the principles and essence of this utility model, various changes or modifications can be made to the embodiments. Therefore, this utility model includes all substitutions within the scope mentioned in the patent application claims, and any equivalent changes made within the scope of this patent application are within the scope of the patent application.
Claims
1. A helical damping buffer limiting hinge structure, comprising a housing connected to a cover and a rotating shaft connected to a body, characterized in that: The housing includes an outer shell and a mounting base disposed on one side of the outer shell. The outer shell contains a cavity with an opening at one end and a mounting hole at the other. A rotating shaft extends into the cavity, and its outer edge is sealed to the opening of the cavity, forming a sealed chamber. The rotating shaft is rotatably connected to the cavity via a helical slider. The damper includes an adjusting needle, a one-way valve, and a helical slider that rotates synchronously with the outer shell. The helical slider is helically connected to the rotating shaft and moves along an axis within the outer shell. The helical slider divides the sealed chamber into a first chamber and a second chamber, with the second chamber located closer to... In the direction of rotation, damping fluid is provided in the first and second cavities, and an oil passage hole connecting the first and second cavities is provided on the spiral slider; the adjusting needle is inserted into the cavity of the outer shell through the mounting hole at the other end of the outer shell. The adjusting needle includes a needle head that mates with the mounting hole and a needle body inserted into the cavity of the outer shell. The needle body is conical and mates with a one-way valve in the oil passage hole. A first oil passage is formed between the valve body of the one-way valve and the oil passage hole, and a second oil passage is formed between the valve hole of the one-way valve and the adjusting needle. An oil outlet hole and an oil flow channel communicating with the oil passage hole and the second cavity are provided on the side wall of the spiral slider.
2. The helical damping buffer limiting hinge structure according to claim 1, characterized in that: At least one inner slide is formed on the inner wall of the second cavity in the outer shell cavity, and at least one outer protrusion is formed on the outer wall of the spiral slider to cooperate with the inner slide. At least one oil groove is formed on each outer protrusion. A first step for limiting the spiral slider is formed between the first cavity and the second cavity.
3. The helical damping buffer limiting hinge structure according to claim 2, characterized in that: The spiral slider has a slider cavity, which is divided into a placement cavity at the front end and a spiral inner cavity at the rear end that mates with the rotating shaft. The inner wall of the spiral inner cavity has a spiral groove, and the placement cavity has a boss that divides the placement cavity into a front connecting cavity and a rear connecting cavity. The rear connecting cavity communicates with the spiral inner cavity and the oil flow channel. An oil passage hole is located on the boss. The rotating shaft has a spiral protrusion that mates with the spiral groove. The one-way valve includes a valve body and a valve seat located on one side of the valve body. The diameter of the valve seat is larger than the diameter of the valve body. The valve seat is located in the front connecting cavity and mates with the boss. The valve body of the one-way valve is inserted into the oil passage hole. The valve body has a valve hole that mates with the needle body of the adjusting needle.
4. The helical damping buffer limiting hinge structure according to claim 3, characterized in that: The rotating shaft includes an outer shaft, a connecting shaft, and an inner shaft connected in sequence. The connecting shaft is sealed to the outer cavity of the outer shell. A second step is formed between the connecting shaft and the inner shaft to limit the movement of the spiral slider. The inner shaft is provided with a spiral protrusion that is spirally connected to the spiral groove in the spiral slider.
5. The helical damping buffer limiting hinge structure according to claim 4, characterized in that: The shaft has an insert inside.
6. The helical damping buffer limiting hinge structure according to claim 4, characterized in that: A first sealing ring is provided between the spiral slider and the second cavity, and a second sealing ring is provided between the connecting shaft and the first cavity; an end cap for sealing the opening of the outer shell cavity is fitted on the connecting shaft.
7. The helical damping buffer limiting hinge structure according to claim 1, characterized in that: The first cavity is also equipped with a spring that is fitted onto the adjusting needle.
8. The helical damping buffer limiting hinge structure according to claim 1, characterized in that: The adjusting needle has a tapered body; the needle tip includes a head and a threaded part, the threaded part connects the head and the needle body, and the threaded part is threadedly connected to the mounting hole inside the housing.
9. The helical damping buffer limiting hinge structure according to claim 1, characterized in that: The rotation angle between the outer shell and the rotating shaft is -10 to 100 degrees.
10. The helical damping buffer limiting hinge structure according to claim 1, characterized in that: The mounting base of the housing is provided with mounting holes for installation, a first mounting platform is formed on the outer shell, a second mounting platform is formed on the rotating shaft, and a positioning groove is also provided on the second mounting platform.