Cylinder Device Voltage Transmission Stability

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Solution Overview

Problem

Existing cylinder devices for vehicles face challenges in stabilizing the transmission of electric or magnetic fields from an imparting unit to an intermediate cylinder due to direct fluid force application and vibration issues, leading to inefficiencies in voltage or magnetic field distribution.

Innovation Solution

The cylinder device incorporates an inner cylinder with a functional fluid, an outer cylinder, an intermediate cylinder, and a reservoir chamber, featuring a rod guide and an extending portion on the intermediate cylinder for improved field transmission, with a conducting device in the gap between the imparting unit and the extending portion for enhanced contact stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the compression spring is disposed protruding toward the electrode to impart voltage, then the structure is simplified, but the stability of voltage transmission deteriorates due to direct fluid force application and vibration

Engineering Contradiction:
Improvestructural simplicityVSAvoidvoltage transmission stability
Core Design Contradiction:
Device complexityVSReliability

Solution Approach 1:

The patent introduces an extending portion as an intermediary component between the compression spring (imparting unit) and the intermediate cylinder (electrode). This extending portion provides a stable contact surface that is not directly subjected to fluid force, thereby mediating the voltage transmission process and improving stability while maintaining the simplified spring-based structure.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Area of stationary object

If the imparting unit is directly contacted with the intermediate cylinder, then the contact area is maximized, but contact resistance increases and heat generation occurs due to vibration

Engineering Contradiction:
Improvecontact areaVSAvoidcontact stability
Core Design Contradiction:
Area of stationary objectVSReliability

Solution Approach 1:

The extending portion is designed to preliminarily establish a stable contact interface before the vibration and fluid force affect the main contact area. By providing this preliminary stable contact surface, the system maintains good electrical contact without the negative effects of vibration-induced instability.

Inventive Principle:
Principle #10Preliminary action

3Force

If the compression spring is subjected to direct fluid force, then the force transmission is efficient, but the voltage impartation stability deteriorates due to vibration during vehicle running

Engineering Contradiction:
Improveforce transmission efficiencyVSAvoidvoltage impartation stability
Core Design Contradiction:
ForceVSReliability

Solution Approach 1:

The patent segments the force transmission and voltage transmission functions into separate components. The compression spring handles force transmission efficiently by being subjected to fluid force, while the extending portion handles voltage transmission stability by providing a protected contact surface, thus separating the two functions to avoid their conflicting requirements.

Inventive Principle:
Principle #1Segmentation

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 enhances the stability and reliability of electric or magnetic field impartation to the intermediate cylinder, reducing contact resistance and heat generation, and improves the overall performance of the shock absorber by allowing for seamless adjustment of damping forces.

Implementation Method 1

an inner cylinder (2) containing a functional fluid (20) which changes in fluid condition under the presence of an electric field or a magnetic field

Methodology Applied
Scientific EffectElectrorheological effect: Electrorheological Effect

Implementation Method 2

a functional fluid (20) which changes in fluid condition under the presence of an electric field or a magnetic field

Methodology Applied
Scientific EffectMagnetorheological effect: Magnetorheological Fluid

Data Source

PatentUS10487904B2Cylinder device
Publication Date: 2019.11.26 ASTEMO LTD
  • US10487904B2 patent drawing
  • US10487904B2 patent drawing
  • US10487904B2 patent drawing

AI summary

An intermediate cylinder is disposed between an outer cylinder and an inner cylinder. The intermediate cylinder forms a passage between the inner cylinder and itself, through which a hydraulic fluid as an electrorheological fluid flows. The intermediate cylinder is supplied (applied) with a voltage through an electrode connector. The intermediate cylinder includes a ring member. The ring member is provided with an extending portion which extends toward the outer cylinder. The extending portion of the ring member is inserted with an electrode pin as an imparting unit for imparting a voltage to the intermediate cylinder.