Frequency Pressure Sensitive Shock Absorber Valve Design
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Solution Overview
Problem
Conventional shock absorbers struggle to simultaneously achieve ride comfort and steering stability due to their constant damping characteristics across varying road conditions and piston speeds, failing to adapt damping forces effectively to frequency and stroke.
Innovation Solution
A frequency/pressure sensitive shock absorber is designed with a sensitive unit that includes a hollow housing, a free piston, and an auxiliary valve assembly, allowing the damping force to vary according to frequency and pressure, utilizing elastic members and inner tubes with specific geometries to control fluid flow between chambers, thereby adjusting damping forces dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single flow passage is used in a conventional piston valve, then the structure is simple, but the damping characteristic remains constant across different speeds, making it impossible to independently control low-speed and high-speed damping forces
Solution Approach 1:
The piston valve is divided into multiple independent flow passages: a first flow passage for high-speed damping control and a second flow passage for low-speed damping control. Each passage can be independently adjusted to provide different damping characteristics at different piston speeds, resolving the contradiction between structural simplicity and damping adaptability.
2Ease of operation
If the damping force varies only according to piston speed change, then the control is simple, but the same damping force is generated in various road surface states, making it difficult to satisfy both ride comfort and steering stability
Solution Approach 1:
Different flow passages are designed with different local characteristics: the first flow passage has a smaller cross-sectional area for high-speed damping, while the second flow passage has a larger cross-sectional area for low-speed damping. This local differentiation allows the valve to adapt to various road conditions by selectively activating appropriate passages based on piston speed, thereby satisfying both ride comfort and steering stability requirements.
3Device complexity
If a conventional shock absorber is used, then the structure is simple, but it cannot simultaneously achieve ride comfort and steering stability due to constant damping characteristics
Solution Approach 1:
The shock absorber employs a dynamic damping control mechanism where the piston valve automatically switches between different flow passages based on piston speed. This dynamic adaptation allows the damping force to vary according to actual operating conditions, ensuring reliable vehicle performance across different road surfaces while maintaining a relatively simple 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 solution enables the shock absorber to effectively disperse and absorb shock energy, satisfying both ride comfort and steering stability by varying damping forces based on frequency and pressure, enhancing the overall performance across different driving conditions.
Implementation Method 1
The free piston may move vertically within the inner space of the housing according to the frequency and the pressure, and may be supported by an upper elastic member and a lower elastic member, such that the free piston is returned to an initial position.
Implementation Method 2
an auxiliary valve assembly mounted at a lower end of the housing and configured to generate a damping force by a flow of a working fluid between an inner space of the housing and the lower chamber
Implementation Method 3
a damping force generated in the shock absorber varies according to an operating speed of the shock absorber
Data Source
AI summary
A frequency/pressure sensitive shock absorber for generating a damping force varying according to a frequency and a pressure-includes: a cylinder filled with a working fluid; a piston rod having one end located inside the cylinder and the other end extending outward from the cylinder; a main piston valve assembly installed at one end of the piston rod and configured to operate in a state that the inside of the cylinder is divided into an upper chamber and a lower chamber, and generate a damping force varying according to a moving speed; and a sensitive unit installed at one end of the piston rod under the main piston valve assembly and configured to generate a damping force varying according to a frequency and a pressure.