Door Hinge With Segmented Coil Springs for Multistage Damping
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Solution Overview
Problem
Conventional door hinges with damping fluid systems require increased external force to open the door panel due to high resilient force needed to return the camshaft to its normal state, making user operation inconvenient.
Innovation Solution
A door hinge design featuring a connecting unit with a shaft seat and a resilient unit comprising multiple coil springs of varying lengths, where the number of coils in each section differs, providing a multistage damping effect through a camshaft and damping fluid system to control the door's opening and closing movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the resilient force of the resilient unit is increased to provide enough restoring force for the camshaft, then the camshaft can return to the normal state reliably, but the external force needed to push the door panel open increases, making operation inconvenient
Solution Approach 1:
The resilient unit is segmented into multiple coil springs with different numbers of coils arranged in series. This segmentation allows the total resilient force to be distributed across multiple stages, where each spring contributes a portion of the restoring force, enabling the camshaft to return reliably while keeping the force required to initiate movement manageable.
Solution Approach 2:
Different sections of the resilient unit have different local properties - specifically, different numbers of coils in different sections create varying resilient force characteristics. This local variation allows the system to provide appropriate restoring force at different stages of camshaft rotation without requiring uniformly high force throughout, thereby maintaining ease of operation while ensuring reliable return.
2Stability of the object's composition
If the damping fluid system is used to slow down the camshaft rotation and prevent abrupt door movement, then the door operation smoothness is improved, but the device complexity increases due to additional components
Solution Approach 1:
The damping fluid system is merged with the existing resilient unit structure. The damping holes are integrated into the coil springs themselves, combining the resilient function and damping function into a single integrated component rather than separate systems, thereby reducing overall device complexity while maintaining movement smoothness.
Solution Approach 2:
The resilient unit is designed to perform multiple functions simultaneously: it provides the restoring force to return the camshaft to normal state and also provides damping through the damping holes in the coil springs. This multi-functionality reduces the need for separate damping components, simplifying the overall device structure while achieving smooth door operation.
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 multistage damping effect slows down the door's pivotal movement, preventing abrupt opening and closing while reducing the resilient force required, enhancing user convenience and door operation smoothness.
Implementation Method 1
the damping fluid in the fluid chamber 171 flows into the abovementioned gap and slows down the movement of the sliding member 15 and the rotation of the camshaft 13
Implementation Method 2
a damping fluid which is in the fluid chamber 171 may be guided to flow in and out of the fluid passage 18 via the gap
Implementation Method 3
the resilient unit 16 is capable of driving the camshaft 13 from the inclined state back to the normal state via the sliding member 15
Data Source
AI summary
A door hinge includes a connecting unit, a moving unit, a rotating unit and a resilient unit. The connecting unit includes a connecting member and a shaft seat that are connected to each other. The shaft seat has a connecting hole that has first and second sections. The rotating unit includes a camshaft that rotatably extends through the shaft seat, and that is connected to the moving unit. The resilient unit is disposed in the connecting hole of the shaft seat, and has a plurality of coils. A quantity of coils in the first section is less than a quantity of coils in the second section. The moving unit is pivotable to drive the camshaft to rotate against a resilient force of the coils of the resilient unit.