Rail Soundproof Covers with Overlapping Fixed Lengths
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Solution Overview
Problem
Existing soundproof devices for rails require multiple soundproof covers of different lengths to accommodate varying rail tie pitches, leading to noise leakage due to clearance issues when using a single fixed length cover.
Innovation Solution
A soundproof device using three rail ties with soundproof covers of a fixed length longer than the rail tie pitches, where the covers overlap by a specific width to cover the rail surface without clearance, incorporating a foamed resin sound absorbing material for enhanced noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soundproof covers of different lengths are prepared to match varying rail tie pitches, then the soundproof effect is improved by eliminating clearances, but the device complexity and inventory requirements increase
Solution Approach 1:
The patent applies universality by designing a single standardized length of soundproof cover that can accommodate multiple rail tie pitch variations. The cover length is set to be longer than the maximum expected pitch, allowing the same cover type to be used across different positions without requiring multiple specialized lengths, thus simplifying inventory while maintaining soundproof effectiveness
Solution Approach 2:
The patent applies dynamics by making the soundproof cover adjustable in length through a removable extension structure. The cover includes a main body and an extension portion that can be selectively added or removed, allowing the effective length to be dynamically adjusted to match different rail tie pitches at different locations, thereby eliminating clearances without requiring multiple fixed-length cover types
2Device complexity
If a single fixed length soundproof cover is used for all rail tie pitches, then the device complexity is reduced, but noise leaks through clearances forming between covers and rail ties
Solution Approach 1:
The soundproof cover incorporates a dynamic length adjustment mechanism with a main body and a removable extension portion. This allows the cover length to be dynamically adapted to match different rail tie pitches, ensuring continuous coverage without clearances that would cause noise leakage, while still using a standardized base design
Solution Approach 2:
The patent applies local quality by providing different length configurations of the same cover type at different locations along the rail. The extension portion is selectively added or removed at each position based on the local rail tie pitch, ensuring optimal fit and soundproof performance at each specific location without requiring entirely different cover designs
3Reliability
If sound absorbing material with large thickness is used for noise reduction, then the soundproof effect is improved, but the workability and ease of installation are reduced due to interference at overlapped portions
Solution Approach 1:
The patent applies taking out by selectively removing the sound absorbing material from the overlapped portion where two covers meet. The sound absorbing material is retained in the non-overlapped portions to maintain noise reduction effectiveness, but is extracted from the overlapped region to eliminate interference and improve workability during installation
Solution Approach 2:
The sound absorbing material distribution is optimized with local quality by concentrating the material in non-overlapped portions where it provides maximum noise reduction benefit, while deliberately leaving the overlapped portions without sound absorbing material to facilitate proper alignment and attachment of adjacent covers
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 solution allows for effective noise prevention using a single type of soundproof cover length, achieving significant noise reduction across a specific frequency range and improving workability by eliminating the need for multiple cover lengths and minimizing interference from thick sound absorbing materials.
Implementation Method 1
incorporating a foamed resin sound absorbing material for enhanced noise reduction
Data Source
AI summary
An object of the invention is to provide a soundproof device preventing noise effectively by a single type of soundproof covers having the same length without necessity of preparation of a number of soundproof covers having different lengths. Three first to third rail ties S1 to S3 that fix a rail R are arranged in sequence from one end to the other end of the rail in the longitudinal direction. A first soundproof cover 31 is bridged between the first and second rail ties S1, S2, and a second soundproof cover 32 is bridged between the second and third rail ties S2, S3. The respective soundproof covers 31, 32 have a fixed length L which is longer than any of a pitch P1 of the first and second rail ties S1, S2 and a pitch P2 of the second and third rail ties S2, S3. Required portions of a rail surface is covered with the first soundproof cover 31 and the second soundproof cover 32 in a state in which opposed end portions of the first soundproof cover 31 and the second soundproof cover 32 are overlapped with each other over a predetermined width on the second rail tie S2.