Diesel Control Valve Assembly Wear Reduction via Replaceable Insert

Solution Overview

Problem

High-pressure pumps used in diesel engines face premature wear due to the reduced lubricity of low sulfur diesel fuels, which existing solutions fail to adequately address, particularly in control valve assemblies where ceramic materials are costly, difficult to manufacture, and prone to failure under tensile stresses.

Innovation Solution

A control valve assembly comprising an actuator, valve element, valve guide, and insert, where the insert is used to form sealed interfaces with the valve element and guide, allowing for the use of wear-resistant materials and minimizing exposure to tensile stresses, thus reducing wear and extending the assembly's lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If ceramic materials are used in control valve assemblies to resist wear from low lubricity fuels, then wear resistance is improved, but manufacturing difficulty and cost increase

Engineering Contradiction:

Improvewear resistanceVSAvoidmanufacturing difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The control valve assembly is divided into separate components: a valve body, a valve element, and an insert. The insert is made of wear-resistant material and is separable from the valve body, allowing the insert to be replaced independently when worn. This segmentation enables the use of expensive wear-resistant materials only where needed, rather than manufacturing entire valve components from difficult-to-process ceramic materials.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The wear-resistant functional element (the insert) is extracted as a separate component from the valve body. This insert can be made of ceramic or other wear-resistant material and is designed to be replaceable. By taking out the wear-critical portion as a separate replaceable component, the system achieves wear resistance without requiring the entire valve assembly to be manufactured from difficult-to-process materials.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If ceramic materials are used in control valve assemblies to resist wear from low lubricity fuels, then wear resistance is improved, but cost increases

Engineering Contradiction:

Improvewear resistanceVSAvoidcost

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The control valve assembly is divided into separate components: a valve body, a valve element, and an insert. The insert is made of wear-resistant material and is separable from the valve body, allowing the insert to be replaced independently when worn. This segmentation enables the use of expensive wear-resistant materials only where needed, rather than manufacturing entire valve components from difficult-to-process ceramic materials.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The insert is designed as a replaceable component that can be made of expensive wear-resistant material. When the insert wears out, only the insert needs to be replaced, not the entire valve assembly. This approach allows the system to achieve high wear resistance at a lower overall cost compared to manufacturing entire valve components from ceramic materials.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If ceramic materials are used in control valve assemblies to resist wear from low lubricity fuels, then wear resistance is improved, but susceptibility to tensile stress failure increases

Engineering Contradiction:

Improvewear resistanceVSAvoidsusceptibility to tensile stress

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The control valve assembly is divided into separate components: a valve body, a valve element, and an insert. The insert is made of wear-resistant material and is separable from the valve body, allowing the insert to be replaced independently when worn. This segmentation enables the use of expensive wear-resistant materials only where needed, rather than manufacturing entire valve components from difficult-to-process ceramic materials.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The insert acts as an intermediary between the valve element and the valve body. It provides the wear-resistant surface needed to withstand low lubricity fuels, while being contained within a metallic valve body structure that provides mechanical strength and supports tensile loads. This intermediary approach allows ceramic materials to be used where wear resistance is critical while avoiding their use in areas subject to tensile stress.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS8287256B2Valve assembly

Publication Date: 2012.10.16 CATERPILLAR INC

AI summary

Although modern diesel fuel formulations are intended to reduce emissions of diesel engines, at least some of those modern fuels tend to have relatively low lubricity levels. The control valve assemblies described herein help to minimize any increased wear that would otherwise result from the use of such low lubricity fuels by providing a valve element, a valve guide, and an insert. The valve element is received within the valve guide and is moveable between an open position and a closed position. The insert forms a first sealed interface and a second sealed interface with the valve element and the valve guide. When the valve element is in the closed position, both of the first sealed interface and the second sealed interface are engaged. When the valve element is in the open position, only one of the first sealed interface and the second sealed interface is engaged.