Sealed-Pore Sintered Alloy Valve Guide for High-Temperature Lubrication
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Solution Overview
Problem
In high-temperature environments, existing sintered alloy valve guides experience lubricating oil leakage, leading to insufficient lubrication and valve adhesion, which causes abnormal wear.
Innovation Solution
A sintered alloy valve guide with sealed pores on its outer circumferential surface, impregnated with lubricating oil, is produced using a method involving molding, sintering, impregnation, and sealing treatments such as shot blasting or resin impregnation to retain the oil and prevent adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the compression ratio is increased to reduce exhaust loss, then combustion efficiency is improved, but engine temperature increases causing lubricating oil to leak out and valve adhesion occurs
Solution Approach 1:
The valve guide utilizes a sintered alloy with controlled porosity (air permeability of 150-300 mL/min at 5 mmHg pressure differential). The porous structure allows lubricating oil to be stored within the valve guide body and supplied to the valve contact surface, maintaining lubrication under high temperature conditions resulting from increased compression ratio.
Solution Approach 2:
The invention controls the air permeability parameter of the sintered alloy within a specific range (150-300 mL/min) to optimize lubricating oil retention. By adjusting the porosity parameters of the sintered material, the valve guide can maintain adequate lubrication even when operating temperatures increase due to higher compression ratios.
2Strength
If silicone resin is impregnated into pores to reduce lubricating oil discharge, then wear resistance is improved, but valve adhesion still occurs in high-temperature environments
Solution Approach 1:
The invention optimizes the air permeability parameter of the sintered alloy to a specific range (150-300 mL/min) that balances lubricating oil retention and supply. This parameter control ensures adequate lubrication even at high temperatures, preventing valve adhesion while maintaining the wear resistance benefits of pore impregnation with silicone resin.
Solution Approach 2:
The valve guide combines sintered alloy material with impregnated silicone resin to create a composite structure. The sintered alloy provides the porous framework for oil storage and delivery, while the silicone resin fills the pores to reduce excessive oil discharge and enhance wear resistance, achieving both protection mechanisms working together.
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 inhibits valve adhesion and abnormal wear in high-temperature conditions, ensuring a valve guide with improved wear resistance and oil retention.
Implementation Method 1
a sintered alloy valve guide impregnated with a lubricating oil including pores that are sealed on the valve guide outer circumferential surface
Implementation Method 2
the impregnation step of impregnating a lubricating oil into the sintered body obtained in the previous step
Implementation Method 3
the sealing step of performing a sealing treatment of pores on the outer circumferential surface of the sintered body impregnated with the lubricating oil
Implementation Method 4
the sintering step of sintering the molded body
Data Source
AI summary
The present invention addresses the problem of providing a sintered alloy valve guide capable of inhibiting valve adhesion even in a high-temperature environment. The problem can be solved by a sintered alloy valve guide impregnated with a lubricating oil including pores that are sealed on the valve guide outer circumferential surface. More particularly, the problem is solved by the sealing step of performing a sealing treatment of pores on the outer circumferential surface of a sintered body impregnated with a lubricating oil.