Axle Support Venting Channel for Crack-Free Press-Fit Assembly
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Solution Overview
Problem
Existing axle fixation methods in electrical devices, such as actuators, face issues with noise, vibration, and housing cracking due to loose or press-fit connections, requiring high manufacturing precision and leading to grease contamination.
Innovation Solution
A venting channel is integrated into the axle support assembly to allow escape of compressed air and excess grease during press-fit installation, preventing cracking and reducing noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If axles are press fit into the actuator housing, then axle stability and noise reduction are improved, but the risk of housing cracking increases due to grease and air pocket compression
Solution Approach 1:
The patent extracts the harmful compressed grease and air pockets from the axle support cavity by providing a drainage channel that leads to the exterior of the actuator housing. This allows the harmful substances to be removed during the press-fit process, preventing housing cracking while maintaining the stability benefits of press-fit axles.
Solution Approach 2:
The drainage channel acts as an intermediary pathway between the sealed axle support cavity and the exterior environment. It provides a controlled route for grease and air to escape during assembly, mediating between the need for a sealed stable connection and the need to prevent pressure buildup that causes cracking.
2Manufacturing precision
If axles are loose fit into the actuator housing, then manufacturing precision requirements are reduced, but noise and vibrational damage increase
Solution Approach 1:
The patent removes the harmful elements (compressed grease and air pockets) that cause housing cracking during press-fit assembly. This enables the use of press-fit axles without the detrimental effects, thereby reducing manufacturing precision requirements while eliminating the source of potential damage.
3Strength
If a drainage hole is drilled from the inside of the axle support to the outside, then housing cracking is prevented, but grease contamination from the actuator occurs
Solution Approach 1:
The drainage channel is designed and positioned to allow grease and air to escape during the assembly process before the actuator is fully sealed. By providing this escape route in advance, the system prevents both housing cracking and subsequent grease contamination, as the harmful substances are removed before they can cause damage or leakage.
Solution Approach 2:
The patent converts the potentially harmful grease and air pockets into a controlled escape process. The drainage channel transforms what would be harmful compressed substances during assembly into a beneficial controlled release mechanism, allowing safe discharge during the press-fit process while preventing contamination during operation.
Data Source
AI summary
An axle support assembly is provided for an electrical device, and which comprises an axle support defining an axle receiver having a cylindrical or substantially cylindrical side wall and an internal base portion. There is also an axle having an end which is dimensioned to be press-fit into the axle receiver. At least one venting channel extends between the internal base portion of the axle receiver and an exterior of the axle support when the axle is press fit into the axle receiver.