Damping Valve With Segmented Orifice Holes for Independent Force Control
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Solution Overview
Problem
Existing damping valves in shock absorbers face challenges in independently setting damping force characteristics for extension and compression sides due to continuous oil flow through orifice holes, leading to inconsistent damping performance, especially at low speeds and varying piston speeds.
Innovation Solution
A damping valve design featuring a valve seat member, annular window, first and second valve elements, and a biasing member, where the second valve element can close the orifice hole in a no-load state, ensuring reliable throttling and independent damping force control by adjusting the valve opening pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the orifice hole is kept open for low-speed damping, then the damping force suitable for ride quality is achieved, but the damping force characteristics on extension and compression sides cannot be set independently
Solution Approach 1:
The invention divides the single orifice hole into two separate orifice holes positioned at different locations. This segmentation allows each orifice hole to be independently controlled by respective valve elements, enabling independent adjustment of damping force characteristics for extension and compression sides while maintaining low-speed damping performance
Solution Approach 2:
The invention introduces valve elements as intermediary components between the operation chambers and the orifice holes. These valve elements selectively open or close the orifice holes based on piston movement direction, enabling independent control of damping characteristics without compromising the low-speed damping function
2Reliability
If the sub-disc is provided to open/close the orifice hole, then the damping force characteristic change is achieved, but the orifice hole cannot be closed completely in no-load state
Solution Approach 1:
The invention replaces the single sub-disc with multiple valve elements (first and second valve elements) positioned at different locations. Each valve element independently controls a respective orifice hole, ensuring complete closure in no-load state while allowing flexible adjustment of valve opening pressures through biasing members
Solution Approach 2:
The invention uses multiple valve elements with similar structures (each comprising a valve body, biasing member, and spring) to replace the single sub-disc. This copying approach ensures that each orifice hole can be completely closed by its corresponding valve element, eliminating the incomplete closure issue while maintaining adjustable valve opening pressure characteristics
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 reliable closure of the orifice hole in a no-load state, preventing unwanted oil flow and allowing for independent setting of damping force characteristics, enhancing ride quality and reducing noise by maintaining consistent damping performance across varying piston speeds.
Implementation Method 1
a biasing member configured to bias the first valve element towards the second valve element
Implementation Method 2
a surface of the second valve element on an opposite side from the valve seat member is higher than the outer circumference valve seat of the valve seat member when viewed from a direction orthogonal to an axial direction of the valve seat member
Data Source
AI summary
A damping valve includes a valve seat member, a first valve element stacked on the valve seat member, a second valve element provided between an inner circumference valve seat of the valve seat member and the first valve element, the second valve element being configured to open and close a hole of the first valve element, and a biasing member configured to bias the first valve element towards the second valve element, wherein a surface of the second valve element on an opposite side from the valve seat member is higher than the outer circumference valve seat of the valve seat member.