Non-Circular Bolt Fastening for Compressor Vibration Isolation
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Solution Overview
Problem
The existing fastening methods for compressor apparatuses, particularly in air suspension systems, face challenges with poor workability due to limited visibility around attachment holes, leading to difficulties in positioning and securing bolts, and inadequate vibration damping, which affects the transmission of vibrations to the vehicle body.
Innovation Solution
A fastening member comprising a bolt with a non-circular relative rotation prevention portion, a washer, and a nut, which includes a through-hole to prevent rotation and ensure proper alignment, effectively securing the compressor apparatus to the vehicle body while preventing vibration transmission through a cylindrical elastic body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional bolt is used for fastening the compressor apparatus to the vehicle body, then the fastening can be completed, but the workability is poor due to limited visibility around the attachment hole, making it difficult to position and secure the bolt accurately
Solution Approach 1:
The invention inverts the conventional fastening approach by providing the opening portion at the vehicle body side rather than requiring the worker to access the attachment hole from the compressor side. This allows the worker to insert the bolt from the easily accessible opening portion, dramatically improving visibility and positioning accuracy while maintaining secure fastening capability
Solution Approach 2:
The non-circular attachment hole acts as an intermediary mechanism that guides the non-circular shaft portion of the bolt into correct rotational alignment. The matched non-circular geometries ensure proper orientation of the bolt relative to the vehicle body, eliminating positioning errors that would otherwise occur due to poor visibility
2Ease of operation
If the attachment hole is positioned for easy access, then workability improves, but the ability to prevent vibration transmission to the vehicle body may be compromised
Solution Approach 1:
The invention segments the attachment hole into two distinct portions: the opening portion for worker access and the non-circular attachment portion for secure engagement and vibration isolation. This segmentation allows the opening portion to be positioned for easy accessibility while the non-circular attachment portion maintains its function of preventing vibration transmission through precise geometric matching with the bolt shaft
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
Improves the workability of fastening by enhancing visibility and positioning accuracy, and effectively prevents the transmission of vibrations from the compressor to the vehicle body, thereby reducing noise and improving the overall assembly process.
Implementation Method 1
a function of damping the vibration
Implementation Method 2
The relative rotation prevention portion is configured to abut against the non-circular attachment hole in a rotational direction to prevent a relative rotation between the bolt and the one side member
Data Source
AI summary
A fastening member includes a bolt and a nut for attaching a compressor to a vehicle body. A non-circular relative rotation prevention portion is formed below a head portion of the bolt. A washer is non-rotatably press fitted around the relative rotation prevention portion. Before the attachment, the head portion and the washer are temporarily fixed with a space generated therebetween. An elastic body, which is attached to the compressor, is disposed between the washer and the nut. A cylindrical member is provided at an inner circumference of the elastic body. As a result, when the nut is screwed, an axial force of the nut is transmitted to the washer via the cylindrical member, and the space between the washer and the head portion is reduced, completing the attachment.