Engine Mount Rubber Fitting Structure to Prevent Dislodgment
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Solution Overview
Problem
Conventional vibration damping devices for engine mounts face issues with relative movement between the main rubber outer member and the drawing fitting during the diameter reduction process, leading to potential dislodgment and misalignment.
Innovation Solution
The vibration damping device incorporates a design where the first tubular part of the main rubber outer member and the second tubular part of the drawing fitting have tapered sections that decrease in diameter in the opposite direction of dislodgment, ensuring the main rubber outer member is securely fixed and preventing relative movement during the diameter reduction process, with optional sealing rubber and flanges for enhanced alignment and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the fitting tube part is subjected to diameter reduction to fix the connecting fitting and fitting tube part, then the connection strength is improved, but the connecting fitting may be pushed out in the dislodgment direction causing relative position shift
Solution Approach 1:
The patent applies preliminary anti-action by providing a stopper that prevents the connecting fitting from being pushed out in the dislodgment direction during the diameter reduction process. The stopper is configured to contact the fitting tube part and counteract the force that would cause the connecting fitting to move, thereby maintaining relative position accuracy while still achieving strong connection through diameter reduction.
Solution Approach 2:
The patent uses an intermediary element (the stopper) that mediates between the fitting tube part and the connecting fitting during the diameter reduction process. This stopper acts as a mediator that transmits the diameter reduction force while preventing excessive displacement, ensuring both connection strength and positioning accuracy are achieved.
2Reliability
If the main rubber outer member and drawing fitting are fixed by diameter reduction, then the assembly is secured, but relative movement in the dislodgment direction occurs causing misalignment
Solution Approach 1:
The stopper provides preliminary anti-action by preventing the main rubber outer member from moving in the dislodgment direction during diameter reduction of the drawing fitting. This ensures that the assembly remains securely fixed while maintaining precise alignment between components.
Solution Approach 2:
The stopper is positioned in advance to counteract potential displacement before it occurs. By having the stopper already in place to prevent dislodgment during the diameter reduction process, the patent ensures both secure assembly and accurate alignment are achieved simultaneously.
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 design effectively prevents dislodgment and misalignment of the main rubber outer member with respect to the drawing fitting, ensuring stable positioning and improved vibration damping performance, while also providing a liquid-tight seal in fluid-filled systems.
Implementation Method 1
the second tubular part is reduced in diameter (by a diameter reduction process) to be fitted to an outer circumferential surface of the first tubular part
Implementation Method 2
the tapered part provided in the first tubular part of the main rubber outer member and the tapered part provided in the second tubular part of the drawing fitting are fitted together, so that the force to reduce the diameter of the drawing fitting is transmitted to the main rubber outer member with a component force in the direction of insertion into the drawing fitting
Data Source
AI summary
A vibration damping device including first and second attachment members connected by a main rubber elastic body. The second attachment member includes a main rubber outer member having a first tubular part fastened to an outer peripheral end of the main rubber elastic body, and a drawing fitting having a second tubular part attached externally about the first tubular part of the main rubber outer member. The first tubular part is axially inserted in the second tubular part, and the second tubular part is reduced in diameter to be fitted to an outer circumferential surface of the first tubular part. Fitted portions of the first tubular part and the second tubular part include respective tapered parts decreasing in diameter in a direction of dislodgment that is opposite to a direction of insertion of the first tubular part in the second tubular part.