Lid-and-Shaft Housing Structure for Vibration Noise Suppression
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Solution Overview
Problem
The existing cable coupling mechanisms generate abnormal noise due to vibrations, caused by relative movement between the shaft and bearing portions, leading to contact and separation between the housing body and lid.
Innovation Solution
The housing design incorporates projecting portions on the opposing surfaces of the side wall and lid, which press against each other to fill the gap between the shaft and bearing portions, preventing relative movement and noise generation during vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a gap is provided between the shaft portion and bearing portion to facilitate assembly, then ease of assembly is improved, but abnormal noise is generated due to relative movement during vibration
Solution Approach 1:
The projecting portion is pre-formed on the lid at a position that corresponds to the gap between the shaft portion and bearing portion. When the lid is installed, this projecting portion automatically fills the gap and presses the shaft portion against the bearing portion, preventing relative movement during vibration while maintaining easy assembly through the pre-designed structural feature
Solution Approach 2:
The projecting portion acts as an intermediary element between the lid and the shaft-bearing assembly. It transfers the pressing force from the lid to the shaft portion, mediating the interaction to eliminate the harmful relative movement while maintaining the necessary assembly clearance
2Manufacturing precision
If dimensional errors occur in molding parts, then manufacturing precision deteriorates, but the projecting portion compensates by pressing the shaft against the bearing to prevent noise
Solution Approach 1:
The projecting portion is designed with specific dimensional parameters (height, position, width) that allow it to compensate for variations in the gap size caused by molding errors. By adjusting the projecting portion's parameters, the design maintains effective contact between the shaft and bearing across a range of dimensional tolerances, preventing noise while accommodating manufacturing variations
3Ease of operation
If the lid is allowed to rotate freely on the shaft portion, then ease of operation is improved, but relative movement causes contact noise during vibration
Solution Approach 1:
The projecting portion creates a localized pressing force at the specific location where the shaft portion contacts the bearing portion. This localized action restricts harmful relative movement only in the critical contact area while leaving the overall rotational movement of the lid on the shaft portion unaffected, maintaining operational ease while eliminating noise
Data Source
AI summary
A housing can be provided, the housing comprising a housing body 2 and a lid 3, wherein the housing body 2 and the lid 3 have a shaft portion Ax1 and a bearing portion Ax2, wherein a side wall W2 has, in a base end region R2, a second opening/closing direction opposing surface F4 opposing a first opening/closing direction opposing surface F3 provided to the lid 3, wherein the first opening/closing direction opposing surface F3 and/or the second opening/closing direction opposing surface F4 has a projecting portion PR1, wherein the side wall W2 has a second axial direction opposing surface F2 opposing a first axial direction opposing surface F1 provided to the lid 3 in an axial direction X, and the first axial direction opposing surface F1 and the second axial direction opposing surface F2 are configured to be pressed against each other in the axial direction X at least in a state in which the lid 3 closes an aperture AP. The housing makes it possible to suppress generation of abnormal noise when the housing vibrates.