Diaphragm Damper Structure for Stable Pulsation Absorption

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Solution Overview

Problem

Existing damper devices fail to stably maintain pulsation-preventing functions and suffer from diaphragm damage due to excessive deformation and uneven stress distribution, leading to reduced durability.

Innovation Solution

A damper device with a diaphragm, an opposite member, and a deformation-suppressing member featuring a concave central portion and protruding portions that distribute stress evenly and absorb shocks, preventing excessive deformation and damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a deformation-suppressing member with a flat outer surface is used to suppress diaphragm deformation, then the durability of the damper device is improved, but the pulsation-preventing function is insufficient

Engineering Contradiction:

ImprovedurabilityVSAvoidpulsation-preventing function

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The deformation-suppressing member features a dual-surface design: a flat outer surface that contacts the diaphragm to suppress deformation and enhance durability, and a concave inner surface that allows controlled deformation for effective pulsation absorption. This local differentiation of surface properties resolves the contradiction between durability and pulsation prevention.

Inventive Principle:

Principle #3Local quality

2Reliability

If the outer surface of the deformation-suppressing member is formed to bulge outward along the inner surface of the diaphragm, then contact with the diaphragm is improved, but excessive deformation suppression occurs

Engineering Contradiction:

Improvecontact stabilityVSAvoidpulsation-preventing function

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The deformation-suppressing member employs different surface geometries at different locations: the outer surface is flat to provide stable contact and suppress deformation, while the inner surface is concave to allow necessary deformation for pulsation absorption, preventing excessive deformation suppression.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of making the entire outer surface bulge to match the diaphragm's inner surface, the invention inverts the approach by making the inner surface concave while keeping the outer surface flat, achieving both contact stability and deformation capability.

Inventive Principle:

Principle #13The other way round (Inversion)

3Power

If the diaphragm is repeatedly deformed and returns to original shape, then pulsation absorption is achieved, but stress concentrates at the outer peripheral portion leading to fatigue damage

Engineering Contradiction:

Improvepulsation absorptionVSAvoiddurability

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The concave inner surface of the deformation-suppressing member is designed to match the deformation pattern of the diaphragm, providing localized support at the outer peripheral portion where stress concentrates during deformation cycles, thereby preventing fatigue damage while maintaining pulsation absorption.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The deformation-suppressing member with its concave inner surface is positioned beforehand to provide support and distribute stress during diaphragm deformation, preventing concentration of stress at the outer peripheral portion before fatigue damage can occur.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 suppresses diaphragm deformation, prevents damage, and extends the service life by stabilizing the pulsation-preventing function and improving durability.

Implementation Method 1

the deformable-action portion is elastically deformed by fuel pressure accompanied by pulsation

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

pulsation is generated in the fuel chamber when the high-pressure fuel pump is driven as described above... a damper device for reducing pulsation generated in the fuel chamber

Methodology Applied

Scientific EffectPulsation absorption: Damping

Implementation Method 3

the inner surface of the diaphragm comes into contact with the deformation-suppressing member... to suppress the deformation of the diaphragm

Methodology Applied

Scientific EffectContact force: Force

Data Source

PatentEP3816429B1Damper device

Publication Date: 2026.01.28 EAGLE INDS

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Figure 3(a)~3(c)

AI summary

There is provided a damper device that can stably maintain a pulsation-preventing function obtained from the deformation of a diaphragm and can extend a service life by suppressing damage to the diaphragm. The damper device includes at least a diaphragm 4, an opposite member 5 that faces the diaphragm 4 and is connected to the diaphragm 4 in a hermetically sealed state over a circumferential direction, and a deformation-suppressing member 40 that is disposed in a hermetically sealed space M defined by the diaphragm 4 and the opposite member 5. The deformation-suppressing member 40 includes a central portion 41 that includes a concave surface 41a of which a depth is increased toward a center in a radial direction thereof, and protruding portions 43 that are provided closer to an outer peripheral side than the central portion 41.