Base Valve Shock Absorber with Nested Frequency-Sensitive Damping
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Solution Overview
Problem
There is a demand for miniaturization in shock absorbers.
Innovation Solution
The shock absorber includes a first passage with a disk generating a damping force, a spool member that changes biasing force via axial movement, a pilot chamber, and a closing member movable with the spool member, along with a frequency sensitive mechanism in a base valve to vary damping force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shock absorber is designed with variable damping force according to piston frequency, then damping performance is improved, but device size increases
Solution Approach 1:
The patent implements nesting by placing the frequency sensitive mechanism inside the base valve structure. The spool member is positioned within the base valve, and the pilot chamber is integrated into the second passage within the base valve housing. This nested arrangement allows the variable damping function to be incorporated without increasing the overall shock absorber volume, as components are arranged concentrically and in nested configurations rather than as separate external assemblies.
Solution Approach 2:
The base valve is designed to serve multiple functions simultaneously: it acts as the primary damping valve, houses the frequency sensitive mechanism for variable damping control, and contains the pilot chamber for pressure regulation. The spool member both controls the first passage for damping and responds to pressure in the pilot chamber. This multi-functionality consolidates what would traditionally require separate components into a single integrated unit, achieving miniaturization while maintaining variable damping performance.
2Volume of moving object
If miniaturization is achieved, then device size is reduced, but manufacturing complexity increases
Solution Approach 1:
The base valve is designed as a segmented structure with distinct functional zones: the first passage for damping flow, the second passage containing the pilot chamber, and the spool member with its own passage. This segmentation allows each component to be manufactured and assembled separately with defined interfaces, reducing the overall manufacturing complexity despite the integrated miniaturized design. The spool member can be manufactured as a separate precision component and then assembled into the base valve housing.
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 configuration achieves miniaturization of the shock absorber while maintaining damping force functionality.
Implementation Method 1
a disk which is provided in the first passage and generates a damping force
Implementation Method 2
a spool member, having a tubular shape, which is capable of changing a biasing force against the disk by moving in an axial direction
Implementation Method 3
a pilot chamber which is provided in the second passage, located on an inner peripheral side of the spool member, and generates a biasing force against the disk in the spool member
Implementation Method 4
a closing member which blocks a flow of the working fluid from the pilot chamber to the other chamber out of the two chambers
Data Source
AI summary
A shock absorber includes a first passage through which a working fluid flows from one chamber in a cylinder due to movement of a piston, a second passage which is provided in parallel with the first passage, a disk which is provided in the first passage and generates a damping force, a spool member, having a tubular shape, which is capable of changing a biasing force against the disk by moving in an axial direction, a pilot chamber which is provided in the second passage, located on an inner peripheral side of the spool member, and generates a biasing force against the disk in the spool member, and a closing member which blocks a flow of the working fluid from the pilot chamber to the other chamber and is provided to be movable with respect to the spool member.