Garage Door Roller Shaft Plastic Coating Noise Reduction
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Solution Overview
Problem
Garage door rollers produce noise due to metal-to-metal contact between the steel roller shaft and the hinge tube as the garage door is raised and lowered, with existing solutions like lubrication and plastic hinges failing to significantly reduce the noise.
Innovation Solution
A roller shaft coated with a hard thermoplastic injection molding, such as Delrin, or covered with 50-90 durometer soft urethane plastic, combined with ball bearings and a plastic tube, to eliminate metal-to-metal contact and reduce noise, with the plastic tube securely retained on the shaft using threads or grooves for a lasting solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a steel roller shaft is used to allow free movement in the hinge tube, then the roller can move freely side to side without binding, but metal-to-metal contact causes noise and rattling
Solution Approach 1:
A plastic insert is introduced as an intermediary component between the steel roller shaft and the metal hinge tube. The plastic insert fits over the steel shaft and contacts the metal tube, serving as a mediator that eliminates direct metal-to-metal contact while preserving the roller's ability to move freely within the hinge tube.
Solution Approach 2:
The solution combines two different materials - steel and plastic - into a composite structure. The steel roller shaft provides structural strength and rigidity, while the plastic insert provides noise reduction and smooth movement. This composite approach leverages the advantages of both materials to resolve the contradiction between free movement and noise reduction.
2Force
If lubricant is applied to reduce friction, then some lubricant benefit is achieved, but noise and rattling are not significantly reduced
Solution Approach 1:
The invention replaces the lubrication-based friction reduction approach with a mechanical solution. Instead of relying on lubricant films to reduce friction and noise, a solid plastic insert is used to physically separate the metal surfaces, providing both friction reduction and noise elimination through its material properties and structural design.
3Object-generated harmful factors
If a plastic hinge barrel is used to eliminate metal contact, then noise is reduced, but strength is sacrificed and the assembly appears weak
Solution Approach 1:
Instead of making the entire hinge barrel plastic, the solution applies local quality by using a plastic insert only where needed - specifically on the roller shaft portion that contacts the hinge tube. The rest of the hinge assembly can remain metal, maintaining overall structural strength while providing noise reduction at the critical contact point.
Solution Approach 2:
The invention uses composite materials to combine the strength of metal with the noise-reducing properties of plastic. The steel roller shaft maintains structural integrity and strength, while the plastic insert provides the noise reduction benefits. This composite structure avoids the weakness associated with fully plastic components.
4Object-generated harmful factors
If the gap between shaft and tube is reduced to eliminate rattling, then noise is reduced, but the roller may bind or stick
Solution Approach 1:
The invention changes the material parameter of the contact surface by introducing plastic material with different friction and compliance characteristics. The plastic insert can be manufactured with precise dimensions that provide a snug fit to eliminate rattling, while its material properties allow it to deform slightly to accommodate manufacturing tolerances and thermal expansion, preventing binding.
Solution Approach 2:
The composite structure of steel shaft with plastic insert allows for optimized dimensional tolerances. The plastic material can be molded to precise dimensions that minimize the gap and eliminate rattling, while its compliance compensates for any slight variations, ensuring smooth operation without binding.
Data Source
AI summary
A roller with a Delrin plastic injection to coat the steel shaft wherein the plastic coated shaft eliminates the metal-to-metal contact that creates the noise. The new and improved Delrin plastic coated shaft will be 1 mm larger than industry standard shafts because 10-11 mm industry standard shafts are too loose in the hinge barrels which allows the rattling. This improved roller shaft is 12 mm at finished thickness to reduce the extra space. A roller wheel connected to a roller shaft being a portion of a hinge affixed to a garage door, the roller wheel adapted to roll within a track of a garage door, the roller wheel including at least one ball bearing and a collar retained in a circumferential cylindrical middle cover seal and the circumferential cylindrical middle cover seal covered with a steel cover, the steel cover covered with 50-90 durometer soft urethane plastic.