Compressor Swash Plate Coating Projections for Wear Reduction
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Solution Overview
Problem
Conventional compressor swash plates with solid lubricant resin coatings experience early attrition due to varying wear and deformation of ridge and groove portions, leading to reduced sliding performance and increased temperature.
Innovation Solution
A compressor swash plate with a flat base member and a coating layer having projections in specific dimensions and shapes, such as concentric circles or annular rings, that satisfy certain contact area and pressure conditions to minimize wear and enhance lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid lubricant resin coating layer is applied to enhance sliding properties, then initial fitness between sliding surfaces is improved, but the coating layer experiences early attrition due to wear and deformation of ridge portions
Solution Approach 1:
The invention applies local quality by creating ridge portions with specific geometric parameters (height H, width B, contact area ratio S) on the coating layer surface. These localized structural features are designed to distribute contact pressure and reduce stress concentration, thereby preventing early attrition while maintaining excellent sliding properties. The ridge portions act as localized load-bearing elements that protect the coating layer from uniform wear.
Solution Approach 2:
The invention utilizes parameter changes by precisely controlling the geometric parameters of the ridge portions (height H between 0.001-0.01mm, width B between 0.01-0.06mm, contact area ratio S between 10-40%). By optimizing these parameters, the coating layer achieves both improved sliding properties and enhanced durability, resolving the contradiction between initial fitness and long-term durability.
2Manufacturing precision
If ridge portions are formed to enhance initial fitness through wear and deformation, then sliding contact is improved, but attrition of ridge portions occurs in early stage
Solution Approach 1:
The invention applies preliminary action by pre-forming ridge portions with specific geometric characteristics before the compressor operates. The ridge portions are designed with optimal height, width, and contact area ratio to anticipate and prevent early attrition. This preliminary structural design ensures that the coating layer maintains its sliding properties without experiencing significant wear or deformation during initial operation.
Solution Approach 2:
The invention resolves the contradiction between initial fitness and attrition prevention by optimizing the geometric parameters of the ridge portions. The height H (0.001-0.01mm), width B (0.01-0.06mm), and contact area ratio S (10-40%) are carefully controlled to achieve the right balance between providing sufficient contact area for good initial fitness and maintaining structural integrity to prevent early attrition.
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 attrition of the coating layer, maintains a favorable lubricated state, reduces friction and heat generation, and enhances sliding properties by ensuring adequate elastic deformation and lubricant retention.
Implementation Method 1
the tip ends of the projections are slightly flattened by elastic deformation
Implementation Method 2
the groove portions can hold lubricant
Data Source
AI summary
A compressor swash plate includes a base member having a flat plate shape, and a coating layer formed on a surface of the base member and having projections formed in a linear shape, in which the following inequalities are satisfied when a plane part formed on a prism is pressed against the coating layer with a pressure of 30 MPa: 0.01≤B≤0.06 and 10≤S≤40, where B indicates widths (mm) of surfaces of the projections in contact with the plane part, and S indicates a percentage (%) of a total sum of an area Si of the contact surfaces (a gross area of the surfaces of the projections in contact with the plane part) relative to a reference area (an area of a part of the coating layer against which the plane part is pressed).