Vibration Isolator Stopper Geometry for Easy Shaft Insertion
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Solution Overview
Problem
Existing vibration isolators face challenges in manufacturing where increased friction between the stopper and shaft portion makes it difficult to insert the shaft into the stopper, while reduced friction leads to the stopper detaching prematurely before the isolator is fixed.
Innovation Solution
The vibration isolator design features a stopper with a hole having a first portion with a smaller span and a second portion with a larger span, allowing easy insertion of the shaft and ensuring the stopper remains attached through friction, with additional features like convex portions and steps to enhance attachment security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction between the hole of the stopper and the shaft portion is increased, then the stopper can be less likely to detach from the shaft portion, but it becomes difficult to insert the shaft portion into the hole of the stopper in the manufacturing process
Solution Approach 1:
The hole of the stopper is divided into two distinct portions: a first portion with a smaller span and a second portion with a larger span. This segmentation allows the hole to perform dual functions - the first portion provides friction for attachment while the second portion facilitates easy insertion by providing clearance
Solution Approach 2:
Different portions of the hole have different local qualities - the first portion has a smaller span creating higher friction for reliable attachment, while the second portion has a larger span creating lower friction for easy insertion. Each portion is optimized for its specific function rather than using a uniform design throughout
2Ease of manufacture
If friction between the hole of the stopper is reduced, then the shaft portion can be easily inserted into the hole of the stopper in the manufacturing process, but the stopper becomes likely to detach from the shaft portion prior to the vibration isolator being fixed to the mating member
Solution Approach 1:
The hole is segmented into two portions with different spans, allowing the second portion to provide easy insertion while the first portion ensures reliable attachment through friction
Solution Approach 2:
The first portion of the hole has a smaller span creating high friction for reliable attachment, while the second portion has a larger span creating low friction for easy insertion. This local differentiation resolves the contradiction between insertion ease and attachment reliability
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 allows for easy insertion of the shaft into the stopper and prevents premature detachment, ensuring reliable assembly and operation of the vibration isolator without the need for adhesives.
Implementation Method 1
the stopper is made of an elastic body... the inner surface of the hole of the stopper includes: a first portion; and a second portion arranged between the first portion and the second surface
Data Source
AI summary
A vibration isolator comprises: a first member in which an end portion of a shaft portion being fixed to a mating member; a vibration-isolation base made of an elastic body connecting a second member and the first member; and a stopper made of an elastic body arranged between the second member and the mating member with the first surface. The shaft portion is arranged in the hole of the stopper with the end portion facing the matching member. The inner surface of the hole of the stopper, prior to the shaft portion is inserted into the hole, includes: a first portion having a span smaller than the thickness of the end portion of the shaft portion; and a second portion arranged between the first portion and the second surface. A span of the second portion is greater than the span of the first portion.