Variable-damping random stop mechanism
By designing a variable damping stop mechanism for the piston and piston rings, the problems of complex structure and oil leakage in existing dampers are solved, achieving the effect of bidirectional unequal damping of the piston rod and arbitrary stopping of the window.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO YILI SHOCK ABSORBER
- Filing Date
- 2025-05-29
- Publication Date
- 2026-05-08
AI Technical Summary
Existing dampers require bidirectional damping with unequal effects, but they are structurally complex and pose a risk of oil leakage.
The system employs a variable damping stop mechanism, which achieves unequal damping for bidirectional piston rod movement through the design of the piston and piston rings. It does not require internal damping oil filling and utilizes the movement of fixed and movable piston rings in different annular grooves to provide different damping effects.
It achieves bidirectional movement with unequal damping of the piston rod, has a simple structure, avoids the risk of oil leakage, and enables the window to be stopped at will.
Smart Images
Figure CN224214003U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of damper technology, and in particular to a variable damping stop mechanism. Background Technology
[0002] Some existing dampers require unequal damping effects in both directions. For example, in windows that open vertically, the damping needs to be smaller when the window opens upwards and larger when it opens downwards to prevent the window from closing automatically under gravity. Existing dampers require internal filling with damping oil, which carries the risk of oil leakage and makes the structure more complex. Utility Model Content
[0003] To address the aforementioned shortcomings of existing dampers, this invention proposes a variable damping stop mechanism with a simpler structure that eliminates the need for internal damping oil filling.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A variable damping stop mechanism includes a cylinder, a piston, and a piston rod. The piston is slidably connected in the cylinder, and an air passage is provided through the piston from front to back. One end of the piston rod is disposed in the cylinder and fixedly connected to the piston. The outer circumference of the piston is provided with a first annular groove and a second annular groove. The stop mechanism also includes a fixed piston ring and a movable piston ring. The fixed piston ring is adapted to the first annular groove and installed in the first annular groove. The outer circumference of the fixed piston ring abuts against the inner wall of the cylinder. The movable piston ring is disposed in the second annular groove. The inner and outer circumferences of the movable piston ring abut against the bottom of the second annular groove and the inner wall of the cylinder, respectively. The bottom of the second annular groove is tapered. The width of the second annular groove is w1, and the width of the movable piston ring is w2, where w1 > w2. The front or rear sidewall of the second annular groove abuts against the movable piston ring.
[0006] With the above settings, the piston rod has unequal damping in both directions, eliminating the need for internal damping oil filling and simplifying the structure.
[0007] Furthermore, the taper of the bottom of the second annular groove is α, 0°. <a<2°。
[0008] The above configuration facilitates the movement of the movable piston ring back and forth in the second annular groove.
[0009] Furthermore, 1mm <w1-w2<5mm。
[0010] By setting the above parameters, the range of motion of the piston ring is limited, allowing the piston rod to lock up more quickly.
[0011] Furthermore, the depth of the front side of the second annular groove is d, which is less than the depth of the rear side groove, by 2 mm. <d<8mm。
[0012] Furthermore, the piston has mounting holes extending through it from front to back, the piston rod end extends through the mounting holes, a boss is provided on the outer periphery of the piston rod, and a nut is threadedly connected to the end of the piston rod, the nut pressing the piston against the boss.
[0013] The above configuration makes it easy to install the piston at the end of the piston rod.
[0014] Furthermore, the cylinder body includes a cylindrical section, a cover plate, and a guide sleeve. The cover plate and the guide sleeve are respectively locked at both ends of the cylindrical section. The piston is slidably connected in the cylindrical section. The piston rod is adapted to the guide sleeve. The piston rod passes through the guide sleeve and is slidably connected to the guide sleeve. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the forward movement of the piston rod in the arbitrary stop mechanism of the embodiment.
[0016] Figure 2 for Figure 1 Enlarged view of point A.
[0017] Figure 3 This is a schematic diagram of the piston rod moving backward in the arbitrary stop mechanism of the embodiment. Detailed Implementation
[0018] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.
[0019] like Figures 1 to 3 A variable damping stop mechanism includes a cylinder 3, a piston 4, and a piston rod 5. The piston 4 is slidably connected in the cylinder 3, and an air passage 6 is provided through the piston 4 from front to back. One end of the piston rod 5 is disposed in the cylinder 3 and fixedly connected to the piston 4. The outer periphery of the piston 4 is provided with a first annular groove 7 and a second annular groove 8. The stop mechanism also includes a fixed piston ring 9 and a movable piston ring 10. The fixed piston ring 9 is adapted to the first annular groove 7 and installed in the first annular groove 7. The outer periphery of the fixed piston ring 9 abuts against the inner wall of the cylinder 3. The movable piston ring 10 is disposed in the second annular groove 8. The inner and outer peripheries of the movable piston ring 10 abut against the bottom of the second annular groove 8 and the inner wall of the cylinder 3, respectively. The bottom of the second annular groove 8 is tapered. The width of the second annular groove 8 is w1, and the width of the movable piston ring 10 is w2, where w1 > w2. The front or rear sidewall of the second annular groove 8 abuts against the movable piston ring 10.
[0020] With the above settings, the piston rod 5 has unequal bidirectional motion damping, eliminating the need for internal damping oil filling, and thus simplifying the structure.
[0021] like Figure 1The front and rear directions of the arbitrary stop mechanism are indicated. The cylinder 3 extends front and rear, and the air passage 6 allows air to pass through the piston 4 on both sides, enabling the piston 4 to move back and forth within the cylinder 3. The piston rod 5 is coaxially arranged with the cylinder 3, with one end extending into the rear end of the cylinder 3 and fixedly connected to the piston 4. The cross-section of the fixed piston ring 9 in this application is adapted to the cross-section of the first annular groove 7. The fixed piston ring 9 is axially fixed to the piston 4 and moves back and forth synchronously with the piston 4. The outer circumference of the fixed piston ring 9 presses against the inner wall of the cylinder 3, providing a damping effect. The front and rear width of the movable piston ring 10 is w2, and the front and rear width of the second annular groove 8 is w1, where w1 > w2. The movable piston ring 10 can move back and forth within the second annular groove 8. The bottom of the second annular groove 8 is inclined relative to the front and rear direction, that is, the front end or rear end of the bottom of the second annular groove 8 is inclined towards the axis of the piston rod 5. For example, Figure 1 The rear end of the bottom of the second annular groove 8 is inclined towards the axis of the piston rod 5. When the piston rod 5 moves forward, the piston 4 and the fixed piston ring 9 move forward synchronously. The fixed piston ring 9 provides damping. The rear side wall of the second annular groove 8 pushes the movable piston ring 10 forward. At this time, the movable piston ring 10 is close to the rear side of the second annular groove 8. Because the rear side of the second annular groove 8 is relatively deep, the inner circumference of the movable piston ring 10 is less squeezed by the bottom of the second annular groove 8, and the pressure between the outer circumference of the movable piston ring 10 and the cylinder 3 is small. There is basically no damping between the movable piston ring 10 and the cylinder 3. Therefore, when the piston rod 5 moves forward, the damping is basically entirely provided by the fixed piston ring 9, and the movable piston ring 10 provides almost no damping. When the piston rod 5 moves backward, as... Figure 3 Piston 4 and fixed piston ring 9 move backward synchronously. Fixed piston ring 9 provides damping. The front wall of the second annular groove 8 pushes the movable piston ring 10 backward. The movable piston ring 10 approaches the front side of the second annular groove 8. The groove depth of the front side of the second annular groove 8 is small. At this time, the bottom of the second annular groove 8 exerts a large squeezing force on the inner circumference of the movable piston ring 10. The movable piston ring 10 is made of elastic material such as rubber. After being squeezed, it deforms, resulting in a decrease in thickness. The outer circumference of the movable piston ring 10 exerts a larger pressure on the inner wall of the cylinder 3. The damping between the movable piston ring 10 and the cylinder 3 increases. Therefore, when the piston rod 5 moves backward, the damping is provided by the fixed piston ring 9. The piston rod 5, provided simultaneously with the movable piston ring 10, has a large total damping. Thus, the piston rod 5 achieves a variable damping effect: low damping when moving forward and high damping when moving backward. No damping oil needs to be injected into the cylinder 3, simplifying the structure. Specifically, in practical window applications, when the window is opened, the piston rod 5 moves forward with low damping. Upon release, the piston rod 5 moves backward. When the front sidewall of the second annular groove 8 abuts against the movable piston ring 10, the damping of the piston rod 5 suddenly increases, and the window's weight can no longer push the piston rod 5 backward, achieving a stop-at-any-window effect. When the window needs to be closed, forcefully closing the window downwards causes the piston rod 5 to move backward.
[0022] As one implementation, the taper of the bottom of the second annular groove 8 is α, 0°. <a<3°。
[0023] The above configuration facilitates the back-and-forth movement of the movable piston ring 10 within the second annular groove 8.
[0024] In this application, the smaller the taper of the bottom of the second annular groove 8, the closer it is to horizontal, the smoother the movement of the movable piston ring 10 in the second annular groove 8. The larger the taper of the bottom of the second annular groove 8, the faster the movable piston ring 10 deforms during movement, and the faster it provides damping. In this application, a is specifically taken as 2°, which takes into account both the smoothness of the movement of the movable piston ring 10 and the sensitivity of providing damping.
[0025] As one implementation method, 1mm <w1-w2<5mm。
[0026] By setting the above, the range of motion of the movable piston ring 10 is limited, allowing the piston rod 5 to lock up more quickly.
[0027] In one implementation, the depth of the front side of the second annular groove 8 is d, which is less than the depth of the rear side groove, by 2 mm. <d<8mm。
[0028] In one implementation, the piston 4 is provided with mounting holes 11 extending through the front and rear, the piston rod 5 is provided with mounting holes 11 at its end, the piston rod 5 is provided with a boss 12 on its outer periphery, and the piston rod 5 is threadedly connected with a nut 13 at its end, the nut 13 pressing the piston 4 onto the boss 12.
[0029] The above configuration makes it easy to install piston 4 at the end of piston rod 5.
[0030] In one implementation, the cylinder body 3 includes a cylindrical portion 31, a cover plate 32, and a guide sleeve 33. The cover plate 32 and the guide sleeve 33 are respectively locked at both ends of the cylindrical portion 31. The piston 4 is slidably connected in the cylindrical portion 31. The piston rod 5 is adapted to the guide sleeve 33. The piston rod 5 passes through the guide sleeve 33 and is slidably connected to the guide sleeve 33.
[0031] The cover plate 32 is detachably installed at one end of the cylinder 31 to facilitate the insertion of the piston 4. The guide sleeve 33 is riveted and fixed at the other end of the cylinder 31. The inner circumference of the guide sleeve 33 fits against the piston rod 5 to improve the stability of the piston rod 5's back-and-forth movement.
[0032] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.
Claims
1. A variable damping arbitrary stopping mechanism, characterized in that, The system includes a cylinder, a piston, and a piston rod. The piston is slidably connected in the cylinder and has a through-hole for air passages. One end of the piston rod is located in the cylinder and is fixedly connected to the piston. The piston has a first annular groove and a second annular groove on its outer periphery. The system also includes a fixed piston ring and a movable piston ring. The fixed piston ring is fitted into the first annular groove and installed therein, with its outer periphery abutting against the inner wall of the cylinder. The movable piston ring is located in the second annular groove, with its inner and outer peripheries abutting against the bottom of the second annular groove against the inner wall of the cylinder. The bottom of the second annular groove has a taper. The width of the second annular groove is w1, and the width of the movable piston ring is w2, where w1 > w2. The front or rear sidewall of the second annular groove abuts against the movable piston ring.
2. The variable damping arbitrary stopping mechanism according to claim 1, characterized in that, The taper of the bottom of the second annular groove is α, 0°. <a<3°。 3. The variable damping arbitrary stopping mechanism according to claim 1, characterized in that, 1mm <w1-w2<5mm。 4. The variable damping arbitrary stopping mechanism according to claim 1, characterized in that, The depth of the front side of the second annular groove is d, which is 2 mm less than the depth of the rear side groove. <d<8mm。 5. The variable damping arbitrary stopping mechanism according to claim 1, characterized in that, The piston has mounting holes extending through it from front to back, and the piston rod has a mounting hole extending through its end. A boss is provided on the outer periphery of the piston rod, and a nut is threadedly connected to the end of the piston rod. The nut presses the piston tightly against the boss.
6. The variable damping arbitrary stopping mechanism according to claim 1, characterized in that, The cylinder body includes a cylindrical section, a cover plate, and a guide sleeve. The cover plate and the guide sleeve are respectively locked at both ends of the cylindrical section. The piston is slidably connected in the cylindrical section. The piston rod is adapted to the guide sleeve, passes through the guide sleeve, and is slidably connected to the guide sleeve.