Rotary Damper Wall Layout for Stable Rotational Resistance
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Solution Overview
Problem
The existing rotary dampers experience fluctuations in rotational resistance during rotor rotation due to air pockets inside the damper.
Innovation Solution
The rotary damper design includes a housing filled with a viscous fluid, a rotor with a specific arrangement of walls and notches, and a cap that fits around the outermost wall, creating a flow path for the viscous fluid that promotes even distribution and quick movement towards the outer periphery, effectively discharging air bubbles through discharge holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air pockets are allowed to remain in the housing during assembly, then abnormal noise generation is prevented, but rotational resistance fluctuates during rotor rotation
Solution Approach 1:
The housing is divided into multiple segments including a bottom surface, side surfaces, and a cap that can be assembled separately. This segmentation allows air pockets to be discharged through discharge holes in the rotor before final assembly, eliminating air-related issues while maintaining structural functionality.
Solution Approach 2:
The viscous fluid acts as an intermediary medium that fills the housing and facilitates the discharge of air pockets through the rotor's discharge holes. The fluid's flow path is designed to carry air bubbles from the housing interior to the exterior, resolving the air pocket problem without requiring complex mechanical evacuation systems.
2Reliability
If a complex flow path structure is implemented to discharge air bubbles, then rotational resistance stability is improved, but manufacturing complexity increases
Solution Approach 1:
Instead of designing complex active mechanisms to remove air, the invention inverts the approach by allowing air to be naturally discharged through the rotor's discharge holes as the viscous fluid flows during normal operation. The flow path structure uses simple radial and circumferential channels that leverage the fluid's own movement to accomplish air removal.
Solution Approach 2:
The invention changes the physical parameters of the housing by introducing discharge holes in the rotor and designing specific flow paths for the viscous fluid. These parameter changes enable air bubble discharge through pressure differentials created during rotation, achieving reliable air removal without complex mechanical systems.
3Reliability
If air pockets are eliminated through complex flow paths, then rotational resistance is stabilized, but device structure becomes more complex
Solution Approach 1:
The discharge holes are merged with the rotor structure itself rather than being separate components. The flow paths for discharging air are integrated into the housing and rotor design, combining multiple functions (structural support, fluid containment, and air discharge) into unified components that reduce overall device complexity.
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
This configuration ensures that air pockets are eliminated, stabilizing the rotational resistance and preventing fluctuations during rotor rotation, resulting in a consistent and reliable rotary damper performance.
Implementation Method 1
a rotary damper including: a housing of which an inside is filled with a viscous fluid; a cap which closes an opening of the housing; and a rotor which exposes a shaft to an outside from the cap and is accommodated in the housing and rotatably supported with respect to the housing, in which the rotary damper imparts a resistance to rotation of the rotor by a torque generated by a shear resistance of the viscous fluid
Data Source
AI summary
A rotary damper that does not cause a problem that a rotational resistance fluctuates during a rotation of a rotor is provided. On a bottom surface of a housing, a plurality of walls are erected concentrically centered on a bearing portion. Notches are formed in the walls at point-symmetrical peripheral positions centered on the bearing portion, and each notch is distributed and arranged at peripheral positions that evenly divide a circumference centered on the bearing portion between the adjacent walls. On a side surface of a rotor, a plurality of walls are erected concentrically centered on a center pin at a pitch deviated from a standing pitch of the walls of the housing by a half pitch. Notches are formed in the walls at point-symmetrical peripheral positions centered on the center pin, and each notch is distributed and arranged at peripheral positions that evenly divide a circumference.