Nested Pipe Member Structure for Construction Machine Vibration Damping
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Solution Overview
Problem
Existing pipe members on construction machines are prone to breaking due to concentrated stress from vibrations, and methods like filling granular materials to reduce vibration amplitude are costly and time-consuming to implement.
Innovation Solution
A pipe member configuration featuring an outer main pipe and an inner auxiliary pipe with a securing part and a free end, where the inner auxiliary pipe vibrates at a different frequency, causing friction between the pipes to consume vibration energy, thereby reducing stress and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If granular materials are filled in the pipe member to reduce vibration amplitude, then the stress on the fixed section is reduced and breakage is avoided, but the manufacturing complexity and cost increase due to forming space partitions and filling materials
Solution Approach 1:
The patent applies nesting by placing an inner auxiliary pipe inside the outer main pipe. The inner auxiliary pipe is inserted into the outer main pipe and secured at specific positions, creating a nested structure that reduces vibration without requiring space partitions or granular material filling. This nested configuration simplifies manufacturing while achieving the vibration reduction effect.
2Ease of manufacture
If the pipe member is made as a simple single pipe structure, then the manufacturing is simple and cost-effective, but the vibration stress concentrates on the fixed section causing breakage
Solution Approach 1:
The patent applies composite structure by combining an outer main pipe and an inner auxiliary pipe made of different materials or with different properties. The inner auxiliary pipe has specific characteristics (such as different diameter, wall thickness, or material composition) that complement the outer pipe, creating a composite structure that reduces vibration stress while maintaining manufacturing simplicity.
Solution Approach 2:
The patent applies dynamics by allowing the inner auxiliary pipe to move independently within the outer main pipe at non-secured sections. This independent movement creates relative motion between the two pipes during vibration, generating friction that dissipates vibration energy. The dynamic interaction between the pipes reduces stress concentration on fixed sections while keeping the structure simple.
3Stability of the object's composition
If the inner auxiliary pipe is completely secured along its length, then the structural stability is improved, but the vibration energy cannot be dissipated through friction and the pipe may still break
Solution Approach 1:
The patent applies local quality by differentiating the securing characteristics along the length of the inner auxiliary pipe. Specifically, one end of the inner auxiliary pipe is secured to the outer main pipe while the other end remains free or loosely secured. This localized variation in securing allows the pipe to maintain overall structural stability while enabling vibration energy dissipation through friction in the non-secured region.
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 pipe member effectively reduces vibrations and enhances durability by utilizing friction between the outer and inner pipes, while simplifying the configuration and reducing processing costs compared to previous solutions.
Implementation Method 1
the inner auxiliary pipe vibrates in a different frequency from that of the outer main pipe when a vibration is applied. So, outer peripheral surface on the inner auxiliary pipe and inner peripheral surface on the outer main pipe rub with each other so that the vibration energy is consumed by a friction between the outer peripheral surface on the inner auxiliary pipe and the inner peripheral surface on the outer main pipe.
Data Source
AI summary
To provide a pipe member being able to reduce the vibration applied and improve its durability. A pipe member to be installed on the body of a construction machine has an outer main pipe and an inner auxiliary pipe inserted into the outer main pipe. An outer diameter of the inner auxiliary pipe is formed smaller than an inner diameter of the outer main pipe. The inner auxiliary pipe has a securing part secured on the outer main pipe and at least one of end parts of the inner auxiliary pipe is a free end without being secured on the outer main pipe.