Variable Shock Absorber Rod Guide Additional Valve

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Solution Overview

Problem

Conventional damping force variable shock absorbers cannot perform frequency selective or amplitude selective functions and fail to generate damping force at extremely low fluid speeds, necessitating the development of additional valves for specific vehicle applications.

Innovation Solution

An additional valve, such as a frequency selective, amplitude selective, or extremely-low-speed valve, is installed within a rod guide to provide these missing functions without affecting the operation of the existing damping force variable valve assembly, allowing for selective adjustment of damping force based on shock frequency or amplitude and low-speed fluid flow.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If an additional valve assembly is added to provide frequency selective and amplitude selective functions, then the shock absorber performance is enhanced, but the device complexity increases

Engineering Contradiction:

Improvefrequency selective and amplitude selective functionVSAvoidvalve assembly structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The additional valve assembly is merged with the existing damping force variable valve assembly to form an integrated valve system. Both valve assemblies are mounted on the same shock absorber body and work together through a unified fluid passage system, reducing overall structural complexity compared to having separate independent assemblies.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The additional valve assembly is positioned within the existing shock absorber structure, utilizing the available internal space and mounting points. The valve assembly is nested into the shock absorber body in a way that minimizes external dimensions and integrates smoothly with the existing components, thereby limiting the increase in device complexity.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Adaptability or versatility

If the additional valve is mounted on the shock absorber body, then the frequency selective and amplitude selective functions are achieved, but the spatial arrangement may interfere with the operation of the damping force variable valve assembly

Engineering Contradiction:

Improvefrequency selective and amplitude selective functionVSAvoidvalve operation independence

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The additional valve assembly is extracted and mounted on the opposite side of the shock absorber body from the damping force variable valve assembly. This spatial separation ensures that the two valve assemblies operate independently without mechanical interference, while both remain integrated into the overall shock absorber system through the fluid passage network.

Inventive Principle:

Principle #2Taking out (Extraction)

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

Enables the damping force variable shock absorber to perform desired additional functions, such as improved ride comfort and steering stability, by selectively mounting additional valves within the rod guide, addressing the limitations of conventional systems and enhancing operational flexibility.

Implementation Method 1

an additional valve which is installed inside a rod guide installed to close an upper opening of the base shell

Methodology Applied

Scientific EffectFluid flow control:

Implementation Method 2

A flow of a working fluid between the reservoir chamber 30 and the compression chamber 22 is controlled by the body valve 27

Methodology Applied

Scientific EffectHydraulic control:

Implementation Method 3

the piston valve 25 partitions the internal space of the inner tube 14 into a rebound chamber 20 and a compression chamber 22

Methodology Applied

Scientific EffectPressure differential:

Implementation Method 4

Due to the separator tube 16, the inside of the base shell 12 is partitioned into a high-pressure chamber PH connected to the rebound chamber 20, and a low-pressure chamber PL serving as the reservoir chamber 30

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Data Source

PatentUS9228632B2Damping force variable shock absorber having additional valve installed in rod guide

Publication Date: 2016.01.05 HL MANDO CORP

AI summary

Provided is a damping force variable shock absorber in which an additional valve is installed in a rod guide so as to implement performance that could not be implemented by a main valve. The damping force variable shock absorber includes: a base shell in which a damping force variable valve assembly is attached to an outside thereof; an inner tube which is installed inside the base shell and in which a piston rod is installed to be movable in a length direction; a piston valve which is connected to one end of the piston rod to partition an internal space of the inner tube into a rebound chamber and a compression chamber; a separator tube which is installed to partition a space between the base shell and the inner tube into a low-pressure chamber and a high-pressure chamber.