Rubber Stopper With Bored Section For Stress Relief
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Solution Overview
Problem
Existing rubber stoppers for railway vehicles have shapes that influence damping performance, spring constant, and durability, making it difficult to set suitable characteristics for mounting and desired stopper characteristics.
Innovation Solution
A rubber stopper design featuring a holding fitting with a partition wall and a rubber section with a bored section near the partition wall, allowing for reduced local stress and increased durability, enabling a shape suitable for mounting and adjustment of mounting pitch, with a rubber side abutment surface that protrudes and is curved for surface contact, dispersing stress and enhancing strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional rubber stopper shape is used, then damping performance and spring constant are determined, but it is difficult to set suitable characteristics for mounting and desired stopper characteristics
Solution Approach 1:
The rubber stopper is divided into a holding section and a rubber section, with the holding section providing mounting flexibility and the rubber section maintaining consistent damping and spring characteristics. This segmentation allows independent optimization of mounting adaptability and performance consistency.
2Volume of moving object
If the rubber stopper size is reduced, then mounting pitch flexibility increases, but local stress concentration occurs reducing durability
Solution Approach 1:
A bored section is introduced locally in the rubber section near the partition wall, creating a stress-relief zone only where needed. This local modification reduces stress concentration without compromising overall durability and allows size reduction for flexible mounting.
3Strength
If a bored section is added to the rubber section, then local stress is reduced and durability increases, but the structure becomes more complex
Solution Approach 1:
The bored section creates a porous or cavity structure within the rubber section, which serves as a stress-relief feature. This simple geometric modification effectively reduces local stress and improves durability without significantly complicating the overall structure.
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
The design increases durability and reduces the size of the rubber stopper, allowing for a desired spring characteristic and strength similar to stoppers without a bored section, while enabling a wider range of mounting pitches and maintaining the same spring characteristics as stoppers without a bored section.
Implementation Method 1
a rubber section (4) that is held by the holding fitting (3) and abuts against a link rod (2) to transmit forward and rearward forces
Implementation Method 2
Japanese Patent Laid-Open No. 11-208468 discloses such a rubber stopper in which a viscous material is sealed to increase damping performance
Data Source
AI summary
The present invention provides a rubber stopper that can set a shape suitable for mounting and set a desired stopper characteristic. Specifically, a holding fitting 3 fastened to one member by means of bolting is provided. A rubber section 4 that abuts against the other member is held by the holding fitting 3. The holding fitting 3 has a partition wall 8 to divide between a peripheral edge of a bolt hole 7 and a holding section 9 that holds the rubber section 4. A rubber side abutment surface 12 in the rubber section 4 protrudes from a top of the partition wall 8. A bored section 13 is formed near the partition wall 8 of the rubber section 4. The bored section 13 increases durability of the rubber section 4. A size of the rubber stopper 1 is reduced.