Axial-Moving Piston Rod Damping Hinge for Oil Leakage Prevention
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Solution Overview
Problem
Traditional door hinges with damping functions have complex structures, leading to issues like oil leakage, maintenance difficulties, and reduced precision, resulting in a shortened lifespan due to the piston rod's inability to move axially, causing increased friction and structural failures.
Innovation Solution
A door hinge design featuring a housing, rotating shafts, U-shaped shaft, linkage member, torsion spring, connector, supporting structure, and damping structure, where the piston rod can move axially, allowing for easier assembly and maintenance, with a damping structure supported by the supporting structure and interacting with a torsion spring to enhance resetting resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the piston rod is prevented from moving in the axial direction to maintain structural stability, then the structural stability is improved, but the friction between the piston rod and sealing ring increases, leading to oil leakage and reduced reliability
Solution Approach 1:
The patent transforms the static piston rod into a dynamic component that can move axially within a limited range. The piston rod is equipped with a limiting structure that allows it to move during damping operation but prevents excessive displacement, thereby reducing friction with the sealing ring while maintaining structural stability.
Solution Approach 2:
The patent separates the piston rod from the cylinder body through a detachable connection structure. The piston rod can be independently assembled and disassembled from the cylinder, allowing for easier maintenance and replacement of the sealing ring, thus improving reliability without compromising structural stability.
2Reliability
If the door hinge structure is made complex to achieve damping function, then the damping function is improved, but the device complexity increases, leading to difficult maintenance and shortened lifespan
Solution Approach 1:
The patent integrates the damping structure directly into the hinge body, with the cylinder and piston rod forming an integrated assembly. The limiting structure is built-in rather than separate, reducing the number of components while maintaining the damping function, thus simplifying the overall device complexity.
Solution Approach 2:
The piston rod serves multiple functions: it provides damping force through its interaction with the sealing ring, limits the range of motion through its built-in limiting structure, and enables easy maintenance through detachable connection. This multi-functionality reduces the need for separate components, simplifying the overall structure.
3Stability of the object's composition
If the piston rod is constrained to prevent axial movement, then the structural stability is improved, but the friction and wear increase, shortening the lifespan of the door hinge
Solution Approach 1:
The patent allows the piston rod to move dynamically within a controlled range during operation, reducing friction and wear. The limiting structure ensures that the movement remains within acceptable bounds, maintaining structural stability while extending the lifespan through reduced wear.
Solution Approach 2:
The patent designs the piston rod with a detachable connection to the cylinder body, allowing the piston rod and sealing ring to be easily replaced when worn. This facilitates maintenance and extends the overall lifespan of the door hinge by enabling component recovery and replacement without replacing the entire assembly.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The simplified structure ensures a longer lifespan, higher precision, and easier maintenance by allowing axial movement of the piston rod, reducing friction and preventing oil leakage, thus enhancing the door hinge's operational reliability.
Implementation Method 1
the torsion spring is fitted over the second rotating shaft, one end of the torsion spring is fixed to the linkage member, and the other end of the torsion spring abuts against the linkage member
Implementation Method 2
a piston rod of the damping structure can abut against the torsion spring, thereby increasing the resetting resistance to the torsion spring
Data Source
Figure 1
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Figure 4~5
AI summary
A door hinge having a damping function, comprising a housing, a first rotating shaft, a second rotating shaft, a U-shaped rotating shaft, a hinge cup, a linkage member, a torsion spring, a connector, a supporting structure, and a damping structure; one end of the linkage member is rotationally provided in the housing by means of the first rotating shaft, and the other end of the linkage member is rotationally connected to the hinge cup by means of one arm of the U-shaped rotating shaft; one end of the connector is rotationally provided in the housing by means of the second rotating shaft, and the other end of the connector is rotationally connected to the hinge cup by means of the other arm of the U-shaped rotating shaft; the torsion spring is fitted over the second rotating shaft.