Oil Pump Outer Ring Pore Structure and Hardness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional outer rings for variable oil pumps face challenges in maintaining sufficient surface hardness and oil film formation under harsh conditions due to the filling of pores during processing, which affects abrasion resistance and oil film formation.
Innovation Solution
A method involving mixing a pre-alloy powder with a copper mixture, compacting, and sinter hardening to create an outer ring with a high surface macro-hardness and increased number of coarse pores, using specific weight percentages of chromium, molybdenum, manganese, sulfur, carbon, and copper, and sintering in a nitrogen-hydrogen atmosphere to achieve a density of 6.80 g/cc or more and pores larger than 100 μm on the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the density is decreased to increase the number of pores, then the number of pores increases, but the modulus of elasticity and surface macro-hardness decrease
Solution Approach 1:
The invention utilizes porous sintered materials with controlled pore structures. By optimizing the sintering process and material composition (specific alloying elements and their ratios), the patent creates a porous structure that maintains both high surface macro-hardness and sufficient pore quantity for oil retention, resolving the contradiction between pore number and hardness
Solution Approach 2:
The invention changes multiple parameters simultaneously including alloy composition (chromium, molybdenum, manganese content), sintering temperature, and sintering atmosphere to achieve the optimal balance between pore quantity and surface macro-hardness, transforming the material properties to satisfy both requirements
2Strength
If conventional sintered materials are used, then abrasion resistance is provided through high hardness, but pores in the surface are filled during processing reducing oil film formation capability
Solution Approach 1:
The invention performs preliminary surface treatment and pore structure optimization before the final machining operations. By controlling the sintering process to create stable, non-collapsible pores and performing surface hardening treatments beforehand, the patent ensures that pores remain open and functional after processing, maintaining both hardness and oil film formation capability
Solution Approach 2:
The invention uses composite sintered materials combining multiple alloying elements (chromium, molybdenum, manganese, carbon) in specific ratios to create a material structure that simultaneously provides high surface macro-hardness for abrasion resistance and maintains open pore structures for oil retention and film formation
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 method results in an outer ring with enhanced surface macro-hardness and increased coarse pores, improving abrasion resistance and oil film formation under harsh conditions while maintaining structural integrity.
Implementation Method 1
sintering the compact to prepare a sintered body
Implementation Method 2
sinter hardening the sintered body
Data Source
AI summary
Disclosed are an outer ring for an oil pump having an increased number and size of open pores in a surface of a molded article and a method for manufacturing the outer ring.