Diesel Pump Segmented Body Protrusion Seal Mitigates Fatigue

Solution Overview

Problem

High pressure fuel pumps in diesel fuel injection equipment face mechanical fatigue due to internal stresses and frequency changes, which jeopardize their mechanical integrity.

Innovation Solution

A high pressure fuel pump design featuring a pressurizing assembly with a plunger and a fuel transfer assembly, including distinct sealing bodies with a sealing interface forming a protrusion, and a counterbore forming a gallery, which reduces hoop stresses through aligned architecture and compressive stress fields, allowing for efficient fuel pressurization and reduced manufacturing complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the pump operates at high pressure with high frequency magnitude changes, then the fuel pressurization performance is improved, but the mechanical fatigue and stress on the pump increase

Engineering Contradiction:

Improvefuel pressurization performanceVSAvoidmechanical integrity

Core Design Contradiction:

PowerVSStrength

Solution Approach 1:

The pump body is divided into two distinct parts: a pressurizing body containing the plunger and compression chamber, and a fuel transfer body containing the valve assemblies. These parts are sealingly fixed together along a sealing area, allowing each component to be optimized independently for its specific function while reducing overall stress concentration points

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sealing interface is designed as a protrusion that raises above the sealing faces, creating a three-dimensional sealing solution rather than a simple flat surface. This protruding sealing interface distributes stress more effectively and prevents stress concentration at the sealing area, thereby reducing mechanical fatigue

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If the sealing area is designed as a compressed surface between sealing faces, then the sealing effectiveness is improved, but the manufacturing complexity increases

Engineering Contradiction:

Improvesealing effectivenessVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The sealing interface is designed as a protrusion that raises above the sealing faces, creating a three-dimensional sealing solution rather than a simple flat surface. This protruding sealing interface distributes stress more effectively and prevents stress concentration at the sealing area, thereby reducing mechanical fatigue

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The pump body is divided into two distinct parts: a pressurizing body containing the plunger and compression chamber, and a fuel transfer body containing the valve assemblies. These parts are sealingly fixed together along a sealing area, allowing each component to be optimized independently for its specific function while reducing overall stress concentration points

Inventive Principle:

Principle #1Segmentation

3Device complexity

If the inlet and outlet valve assemblies are integrated into a single fuel transfer body, then the device complexity is reduced, but the stress distribution may be affected

Engineering Contradiction:

Improvevalve assembly integrationVSAvoidstress distribution

Core Design Contradiction:

Device complexityVSStress or pressure

Solution Approach 1:

The pump body is divided into two distinct parts: a pressurizing body containing the plunger and compression chamber, and a fuel transfer body containing the valve assemblies. These parts are sealingly fixed together along a sealing area, allowing each component to be optimized independently for its specific function while reducing overall stress concentration points

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sealing interface is designed as a protrusion that raises above the sealing faces, creating a three-dimensional sealing solution rather than a simple flat surface. This protruding sealing interface distributes stress more effectively and prevents stress concentration at the sealing area, thereby reducing mechanical fatigue

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 design effectively mitigates mechanical fatigue by minimizing hoop stresses and maintaining material strength, while simplifying manufacturing and assembly processes through aligned components and compressive stress fields.

Implementation Method 1

at least one of said sealing faces being provided with a sealing interface forming a protrusion raising above said at least one of said sealing faces, the tip of said sealing interface defining the sealing area

Methodology Applied

Scientific EffectCompressive stress: Compression

Implementation Method 2

a plunger arranged in a bore is adapted to translate along a main axis in order to vary the volume of a compression chamber defined by an extremity of the bore and an extremity of the plunger

Methodology Applied

Scientific EffectMechanical compression: Compression

Data Source

PatentUS10995718B2High pressure diesel pump

Publication Date: 2021.05.04 PHINIA JERSEY HOLDINGS LLC

AI summary

A high pressure fuel pump includes a pressurizing assembly where a plunger arranged in a bore translates along a main axis. The pump also includes a fuel transfer assembly having an inlet valve assembly and an outlet valve assembly. The pressurizing assembly has a pressurizing body provided with the bore and the fuel transfer assembly has a fuel transfer body within which are arranged the inlet and the outlet valve assemblies. The pressurizing body and the fuel transfer body are distinct parts fixed to each other along a sealing area.