Rotary Damper Cover Collar Prevents Fluid Infiltration
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Solution Overview
Problem
Existing braking devices for doors and drawers, which use viscous fluids to soften movement, face issues with fluid infiltration during assembly and welding, leading to compromised weld quality and the presence of air sacs that affect performance.
Innovation Solution
A braking device with a collar-like protuberance on the cover prevents viscous fluid infiltration during assembly and welding, allowing for a full chamber capacity without compromising weld quality, using a combination of a cylindrical chamber, rotor, and O-ring for a hermetic seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of viscous fluid in the chamber is increased to full capacity, then the braking performance is improved, but the viscous fluid infiltrates the weld area during assembly causing poor weld quality
Solution Approach 1:
The invention divides the chamber into two functional zones: a lower zone for welding operations and an upper zone for viscous fluid containment. This segmentation is achieved through the positioning of the rotor and the design of the chamber geometry, allowing the weld area to be kept free of fluid infiltration while the fluid volume is maximized for optimal braking performance
Solution Approach 2:
The rotor shaft acts as an intermediary element that separates the welding zone from the fluid zone. By positioning the rotor shaft centrally and designing the chamber with appropriate clearance, the invention creates a physical barrier that prevents viscous fluid from reaching the weld area during assembly while still allowing full chamber fluid capacity for braking performance
2Manufacturing precision
If the amount of viscous fluid is limited to prevent infiltration, then weld quality is improved, but air sacs are formed inside the chamber affecting device performance
Solution Approach 1:
The chamber is segmented into a welding-safe lower region and a fluid-filled upper region. This spatial segmentation allows the use of full chamber fluid capacity without compromising weld quality, as the rotor and chamber geometry ensure fluid remains in the upper zone during assembly operations
Solution Approach 2:
The invention performs preliminary positioning of the rotor and chamber components during assembly to establish proper fluid distribution before welding. By pre-positioning the rotor shaft and ensuring correct chamber orientation, the system prevents air sac formation while maintaining weld quality
3Reliability
If the chamber is filled to full capacity with viscous fluid, then the braking efficiency is enhanced, but the fluid soils the shoulder surface during assembly compromising the seal
Solution Approach 1:
The rotor shaft and chamber geometry serve as intermediary structures that create a physical separation between the viscous fluid and the shoulder surface. This intermediary arrangement allows full fluid capacity for braking efficiency while preventing fluid contact with the welding surface through proper spatial positioning and clearance design
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 solution ensures a uniform and effective weld, eliminating air sacs and enhancing the performance of the braking device by maintaining the viscous fluid within the chamber, thereby improving the braking mechanism's efficiency.
Implementation Method 1
a rotor (31) partially received inside said chamber (18), characterised in that the cover (21) has a collar-like protuberance (122) capable of preventing the infiltration of the viscous fluid as far as the shoulder surface (18d)
Data Source
AI summary
A rotary damper comprises a casing fixable to a structure and which comprises a wall which surrounds a chamber filled with a viscous fluid and has an inner surface facing the chamber. A cover is mounted and welded on a shoulder surface of the wall of the casing in such a way as to close the chamber in a sealed manner. A rotor which is mounted rotatably on the casing and comprises a disc portion, adapted to rotate within the chamber, and has a shaft portion extending axially from the disc portion and emerging through the cover so as to be operationally associable with a movable member. The cover has peripherally a collar-like protuberance, extending along the entire perimeter of the cover and coupled to the inner surface of the wall of the casing in such a way as to oppose the infiltration of the viscous fluid between the collar-like protuberance and the inner surface of the wall.