Self-compensating long-life friction damping structure

Abstract

The utility model discloses an automatic-compensation long-life friction damping structure, belongs to a rotating screen structure, and solves the problems that an existing damper is fast in resistance torque attenuation and high in precision requirement through an opening conical surface damping sleeve and a spring compensation mechanism. The conical surface design reduces the machining precision of the friction surface, and the spring thrust is amplified through the conical surface angle to form a stable frictional resistance moment. The utility model has the advantages of long service life and low cost; the noise is low; the installation is easy; and the opening damping sleeve simplifies the assembly process.

Description

Technical Field

[0001] This utility model belongs to the field of rotating screen structure, specifically relating to a long-life friction damping structure for automatic compensation of rotating screens, which is particularly suitable for devices requiring high stability damping such as automotive ceiling screens and laptop screens. Background Technology

[0002] Modern rotating screens, such as car ceiling-mounted displays and laptop screens, can be rotated to open and retract. When opening, to accommodate vibrations, such as those from a car, a damper needs to be added to the screen's axis. Currently, most rotating dampers on the market, especially high-damping dampers, are cylindrical interference-fit dampers or multi-plate end-face dampers. These have the following drawbacks: 1. Cylindrical interference-fit dampers: Due to frictional losses, the interference amount decreases, thus reducing the resistance torque. The damping decreases with use, often dropping by more than 20% after tens of thousands of cycles. Furthermore, cylindrical friction dampers require very high precision in the diameter of the friction surface. Large deviations will cause large deviations in the damper's resistance torque, reducing product quality. High precision requirements also drive up the cost of the damper, resulting in higher manufacturing costs. 2. End face multi-plate friction damper: It requires a lot of pressure to provide a large resistance torque, so it is generally made of metal, which is more expensive and larger in size. Moreover, if the lubrication is not handled well, there will be abnormal noise exceeding 40dB. Although the life is relatively long, there is still a problem of gradual torque reduction.

[0003] Therefore, there is an urgent need for a friction damping structure that has a long lifespan, stable drag torque, low cost, and easy installation. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned defects and provide a dynamic compensation long-life friction damping structure. Through the conical surface fit and spring compensation mechanism, the precision requirements of the friction surface are reduced, the service life is extended, and the stability of the resistance torque is improved.

[0005] The purpose of this utility model is achieved through the following technical solution: an automatically compensated long-life friction damping structure, characterized in that it includes an output shaft, a housing, a damping sleeve, a thrust spring, a spring retaining ring (sliding bushing), an output wheel, and an input wheel. The output shaft has a conical surface along its axial direction, the housing has an inner conical surface, and the first damping sleeve and the second damping sleeve each have a longitudinal opening. The first damping sleeve has an inner conical surface that mates with the conical surface of the output shaft, and the second damping sleeve has an outer conical surface that mates with the inner conical surface of the housing. Damping sleeve one and damping sleeve two are sequentially fitted onto the output shaft along its axial direction. The inner conical surface of damping sleeve one matches the conical surface of the output shaft. The thrust spring and spring retaining ring (sliding bushing) are fitted onto the output shaft. The thrust spring is located between damping sleeve two and spring retaining ring. The output wheel is fixed to the front end of the output shaft and abuts against the spring retaining ring. The outer shell is fitted onto the outside of the output shaft. The outer conical surface of damping sleeve two matches the inner conical surface of the outer shell. The input wheel is fitted onto the output shaft and located at the bottom of the output shaft cone.

[0006] The cone angle α of the damping sleeve one and damping sleeve two is 5°-12°.

[0007] A magnet is installed at the tail of the output shaft, and an angle sensor is installed at the top inside the housing, with the magnet corresponding to the angle sensor.

[0008] The damping sleeve one and damping sleeve two are made of wear-resistant polymer plastic material.

[0009] The output shaft is made of aluminum alloy or ordinary steel.

[0010] The beneficial effects of this utility model are:

[0011] 1. Long lifespan: The spring compensation mechanism offsets frictional losses, and the resistance torque remains stable after tens of thousands of uses;

[0012] 2. Low cost: The conical surface design reduces the precision requirements of the friction surface, and the plastic material reduces manufacturing costs;

[0013] 3. High stability: The elastic fit of the conical surface eliminates movement gaps, resulting in excellent seismic resistance;

[0014] 4. Low noise: The wear-resistant polymer plastic material keeps the operating noise below 35dB;

[0015] 5. Easy to install: The open damping sleeve simplifies the assembly process. Attached Figure Description

[0016] Figure 1 This is a frontal cross-sectional view of the present invention.

[0017] Figure 2 This is a schematic diagram of the right-side cross-section of this utility model.

[0018] In the picture:

[0019] 1-Output shaft, 2-Damping sleeve one, 3-Damping sleeve two, 4-Thrust spring, 5-Spring retaining ring, 6-Elastic pin, 7-Input wheel, 8-Magnet, 9-Angle sensor, 10-Output wheel, 11-Housing. Detailed Implementation

[0020] Example: Figure 1 , 2 As shown, an automatically compensated long-life friction damping structure includes two sets of damping sleeves 2 with inner conical surfaces and 3 with outer conical surfaces, each with a longitudinal opening, made of wear-resistant polymer plastic; an output shaft 1 with a conical surface; a housing 11 with an inner conical surface; a thrust spring 4; a spring retaining ring 5; an output wheel 10; an input wheel 7; a magnet 8; and an angle sensor 9. The output shaft 1, made of aluminum alloy or ordinary steel, has a conical surface along its axial direction. The housing 11 has an inner conical surface. The damping sleeves 2 and 3 are... The damping sleeve 1 (2) has a longitudinal opening. It has an inner conical surface that mates with the conical surface of the output shaft 1, and an outer conical surface that mates with the conical surface of the inner hole of the outer casing 11. The conical angle α of the damping sleeves 1 and 2 is 5°-12°. The damping sleeves 1 and 2 (3) are sequentially fitted onto the output shaft 1 along its axial direction. The inner conical surface of the damping sleeve 1 (2) matches the conical surface of the output shaft 1. The thrust spring 4 and the spring retaining ring 5 are fitted onto the output shaft 1, with the thrust spring 4 located between the damping sleeve 2 (3) and the spring retaining ring 5. The output wheel 10 abuts against the spring retaining ring 5 and is fixed to the front end of the output shaft 1 by the elastic pin 6 to prevent the output wheel 10 from moving axially. The outer shell 11 is fitted onto the outside of the output shaft 1, and the outer conical surface of the damping sleeve 2 3 matches the inner conical surface of the outer shell 11. The input wheel 7 is fitted onto the output shaft 1 and is located at the bottom of the cone of the output shaft 1. The output wheel 10 presses against the spring retaining ring 5, and the thrust spring 4 provides axial thrust to the conical damping sleeves 2 and 3. The axial thrust pushes the open conical damping sleeves 2 and 3, causing them to move along the conical output shaft. A relatively large radial pressure is generated between the output shaft 1 and the conical outer shell 11, which in turn forms a large required frictional resistance torque. The damping torque is between the output wheel 10 and the input wheel 7. The damping torque can form protection to prevent the load from impacting the input wheel 7 and causing damage, and maintain the stability of the load. After the input wheel 7 stops inputting torque, it can maintain the angular position of the load. A magnet 8 is installed at the tail of the output shaft 1, and an angle sensor 9 is installed at the top inside the outer shell 11. The magnet 8 corresponds to the angle sensor 9 and can provide real-time feedback on the angular position of the output shaft 1.

[0021] The thrust of the thrust spring is T = Fsin(ɑ), where F is the pressure on the conical surface of the conical damping sleeve, and ɑ is the cone angle; F = T / sin(ɑ). When the cone angle ɑ is relatively small (e.g., ɑ < 12°), F >> T, that is, the pressure is amplified through the cone with a smaller taper, thus the damping sleeve obtains a larger pressure F. The frictional resistance torque M = ∫Fdr = ∫T*μ*dr / sin(ɑ), where μ is the coefficient of friction. If ɑ = 5°, then the frictional resistance torque M ≈ 11.5∫Tμdr, that is, the pressure F is equivalent to amplifying the spring thrust T by 11.5 times.

[0022] Working principle:

[0023] The motor drives the input wheel 7, which transmits torque via a gear pair. The thrust spring 4 pushes the damping sleeve to move axially along the conical surface of the output shaft, creating radial pressure between the damping sleeve and the inner conical surface of the housing. Under the preload of the thrust spring 4, damping sleeves 2 and 3 form a frictional resistance torque with the output shaft 1 / housing 11. The output wheel 10 outputs a controllable torque. A small conical angle α (e.g., α < 12°) significantly increases frictional resistance through a pressure amplification effect (F = T / sinα) (when α = 5°, F ≈ 11.5T). The open design of the damping sleeve reduces installation difficulty, and the spring automatically compensates for wear, maintaining stable pressure.

[0024] This invention utilizes a spring to axially push a conical surface, enabling the damper to provide damping compensation. Although the spring also elongates to reduce the thrust, the reduction in thrust is minimal compared to the interference fit of the cylindrical surface damper, maintaining a relatively consistent pressure. This ensures that the damping torque remains essentially constant after tens of thousands of wear cycles. This also eliminates movement gaps, thereby improving motion smoothness, ensuring a smooth ride even during bumpy car operation.

[0025] This utility model features an open-faced conical damping sleeve. The opening simplifies installation and reduces costs. The conical surface lowers the diameter accuracy requirements of the damping sleeve, shaft, and housing by 1-2 grades, thus reducing the overall cost even with the addition of a spring.

[0026] The present invention features a longitudinally cut plastic conical surface with an opening, which gives the conical surface greater elasticity, reduces the accuracy requirements of the friction surface diameter, and provides good stability of the resistance torque.

[0027] This invention, through a longitudinally open conical damping sleeve, not only reduces the precision requirements of the friction contact surface but also simplifies installation. After the conical surface wears down due to friction, it automatically compensates under the push of the spring, extending its service life. At the same time, the conical ring surface has greater elasticity, reducing the precision requirements of the friction surface diameter and providing good resistance torque stability and shock resistance.

[0028] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the technical principles of the present invention and should not be construed as limiting the scope of protection of the present invention in any way. Based on this explanation, those skilled in the art can conceive of other specific embodiments of the present invention without creative effort, and all of them will fall within the scope of protection of the present invention.

Claims

1. A long-life friction damping structure with automatic compensation, characterized in that: The device includes an output shaft, a housing, a first damping sleeve, a second damping sleeve, a thrust spring, a spring retaining ring, an output wheel, and an input wheel. The output shaft has a conical surface along its axial direction, and the housing has an inner conical surface. The first and second damping sleeves each have a longitudinal opening. The first damping sleeve has an inner conical surface that mates with the conical surface of the output shaft, and the second damping sleeve has an outer conical surface that mates with the inner conical surface of the housing. The first and second damping sleeves are sequentially fitted onto the output shaft along its axial direction, with the inner conical surface of the first damping sleeve matching the conical surface of the output shaft. The thrust spring and the spring retaining ring are fitted onto the output shaft, with the thrust spring located between the second damping sleeve and the spring retaining ring. The output wheel abuts against the spring retaining ring and is fixed to the front end of the output shaft. The housing is fitted onto the outside of the output shaft, with the outer conical surface of the second damping sleeve matching the inner conical surface of the housing. The input wheel is fitted onto the output shaft and located at the bottom of the conical surface of the output shaft.

2. The automatically compensated long-life friction damping structure according to claim 1, characterized in that: The cone angle α of the damping sleeve one and damping sleeve two is 5°-12°.

3. The automatically compensated long-life friction damping structure according to claim 1, characterized in that: A magnet is installed at the tail of the output shaft, and an angle sensor is installed at the top inside the housing, with the magnet corresponding to the angle sensor.

4. The automatically compensated long-life friction damping structure according to claim 1, characterized in that: The damping sleeve one and damping sleeve two are made of wear-resistant polymer plastic material.

5. The automatically compensated long-life friction damping structure according to claim 1, characterized in that: The output shaft is made of aluminum alloy or ordinary steel.

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