Frequency Sensitive Shock Absorber Dividing Disk Design

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Solution Overview

Problem

Conventional frequency sensitive type shock absorbers face issues with contact noise, durability degradation, and increased manufacturing costs due to complex structures and high component counts, particularly during low frequency strokes.

Innovation Solution

A frequency sensitive type shock absorber with a multi-stage contact structure at the dividing disk interface during low frequency strokes, featuring ring-shaped contact protrusions and seals with curved surfaces, reduces deformation and supports durability, while using a single dividing disk to adjust damping forces based on vehicle speed and road surface conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a conventional auxiliary valve with spool and elastic member is used to generate soft damping force, then damping force adjustment is achieved, but contact noise is generated and durability is degraded due to impact during spool movement

Engineering Contradiction:

Improvedamping force adjustmentVSAvoidcomponent durability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent removes the spool and elastic member from the auxiliary valve structure, extracting the problematic moving components that cause impact and contact noise. The damping force adjustment function is achieved instead through a dividing disk with variable orifice area, eliminating the need for mechanical moving parts while maintaining adaptability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces a dividing disk as an intermediary element that controls fluid flow between chambers. This disk with variable orifice area serves as a mediator to adjust damping forces without requiring direct mechanical movement of spools or contact between moving components, thereby preventing impact-related durability issues.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If a conventional auxiliary valve with multiple components is used, then soft damping force is generated, but manufacturing cost increases due to large number of components and complex structure

Engineering Contradiction:

Improvesoft damping force generationVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent merges multiple separate components (spool, elastic member, housing, valve body) into a single integrated auxiliary valve structure. The dividing disk is formed as one piece with the auxiliary valve body, and the orifice is directly formed in the disk, eliminating the need for separate moving parts and reducing assembly complexity while maintaining soft damping force generation capability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The dividing disk serves multiple functions simultaneously: it divides the auxiliary chamber into upper and lower portions, provides the variable orifice for damping control, and acts as the structural element replacing the spool mechanism. This multi-functionality reduces the overall component count and simplifies the valve structure.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of manufacture

If a single dividing disk is used to adjust damping force, then manufacturing cost is reduced, but component durability may be affected during low frequency stroke

Engineering Contradiction:

Improvemanufacturing costVSAvoidcomponent durability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies local quality by forming a contact protrusion at the specific location where the dividing disk contacts the orifice during low frequency stroke. This localized structural feature distributes the contact stress and prevents excessive deformation at critical points, enhancing durability while maintaining the simple single-disk design.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The contact protrusion is formed with a curved surface that matches the curvature of the orifice edge, allowing for smooth contact and stress distribution during low frequency operation. This curved geometry prevents stress concentration and reduces deformation of the dividing disk while maintaining manufacturing simplicity.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 effectively decreases deformation and prevents durability degradation, improves ride comfort and steering stability, and reduces manufacturing costs by generating adjustable damping forces using a simpler design.

Implementation Method 1

one surface of the dividing disk bent to come into contact with the first contact protrusion and the second contact protrusion sequentially to close the orifice hole during a low frequency stroke

Methodology Applied

Scientific EffectFluid flow control:

Implementation Method 2

an elastic member for elastically supporting the spool

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS10330169B2Frequency sensitive type shock absorber

Publication Date: 2019.06.25 HL MANDO CORP

AI summary

The present disclosure relates to a frequency sensitive type shock absorber configured to generate a soft damping force using one dividing disk to change the damping force on the basis of a traveling speed of a vehicle and a state of a road surface, improve ride comfort and steering stability, and decrease a manufacturing cost.