Multi-Passage Shock Absorber for Durable Damping Control
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Solution Overview
Problem
There is a demand for improving the durability of shock absorbers, particularly in vehicles, to enhance their performance and longevity.
Innovation Solution
A shock absorber design featuring a double cylinder structure with multiple damping force generating mechanisms and a volume variable mechanism, including a first and second passage with separate damping force generating mechanisms, and a relief mechanism to manage fluid flow and damping forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single damping force generating mechanism is used in the first passage, then the shock absorber structure is simple, but the durability is insufficient
Solution Approach 1:
The damping force generating mechanism is divided into multiple independent mechanisms (first, second, third damping force generating mechanisms) operating in separate passages. Each mechanism handles specific flow conditions, distributing stress and wear across multiple components rather than concentrating it in a single mechanism, thereby improving overall durability.
Solution Approach 2:
The shock absorber incorporates a volume variable mechanism that dynamically adjusts the volume of the third passage based on piston speed. This dynamic adjustment allows the system to adapt to varying operating conditions, optimizing performance and durability across different stroke speeds by activating appropriate damping mechanisms at different speeds.
2Reliability
If multiple damping force generating mechanisms are added to improve durability, then the reliability increases, but the device complexity increases
Solution Approach 1:
Multiple damping force generating mechanisms are integrated into a single shock absorber assembly that handles both compression and extension strokes. The first damping force generating mechanism operates during extension stroke while the second and third mechanisms operate during compression stroke, allowing one assembly to perform multiple functions and reducing overall system complexity despite having multiple mechanisms.
Solution Approach 2:
The volume variable mechanism acts as an intermediary that dynamically routes fluid flow between different passages based on piston speed. This mediator component协调s the operation of multiple damping mechanisms, enabling them to work together efficiently without requiring complex external control systems.
3Manufacturing precision
If the volume variable mechanism adjusts the third passage volume dynamically, then the damping force control precision is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The volume variable mechanism utilizes hydraulic pressure from the working fluid to automatically adjust the volume of the third passage. The hydraulic system responds to piston speed changes through pressure differentials, eliminating the need for complex electronic sensors or actuators. This hydraulic approach achieves precise damping force control while maintaining relatively simple manufacturing requirements.
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 enhances durability and performance by optimizing fluid flow and damping forces, leading to improved shock absorber longevity and reliability.
Implementation Method 1
a first damping force generating mechanism provided in the first passage and configured to generate a damping force
Implementation Method 2
a volume variable mechanism provided in the third passage
Data Source
AI summary
A shock absorber includes a first passage (92) through which a working fluid flows out from a chamber that is an upstream side to a chamber (23) that is a downstream side due to movement of a piston (21), a first damping force generating mechanism (41) provided in the first passage (92) to generate a damping force, a second passage (182) provided separately from the first passage (92), a second damping force generating mechanism (183) provided in the second passage (182) and opened to generate a damping force when a piston speed is lower than that of the first damping force generating mechanism (41), a third passage (512) provided separately from the second passage (182), a volume variable mechanism (186) provided in the third passage (512), a fourth passage (521) provided separately from the third passage (512), and a relief mechanism (522) provided in the fourth passage (521) and opened after the second damping force generating mechanism (183) is opened.