Compressor Shoe Recess Radius for Oil Film Stability
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Solution Overview
Problem
Conventional compressor shoes with acute-angled edges or recesses can break the oil film, reducing seizure resistance between the shoe and swash plate.
Innovation Solution
A compressor shoe design featuring a second sliding face with a recess and rounded connecting portions with radii greater than 5 mm, facilitating oil film formation and preventing film obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a recess is formed in the sliding face of the shoe to retain lubricant, then seizure resistance is improved, but the oil film may break due to acute-angled edges at the connecting portions
Solution Approach 1:
The connecting portions between the recess and the sliding face, and between the sliding faces, are formed with rounded shapes having radii larger than 5 mm. This curvature eliminates acute-angled edges that would otherwise break the oil film, while the recess continues to retain lubricant for improved seizure resistance.
Solution Approach 2:
The radius of the connecting portions is specifically designed to be larger than 5 mm, creating a favorable curvature radius that prevents oil film breaking. This parameter change transforms the geometric characteristics of the connecting portions from acute-angled to smoothly rounded, resolving the contradiction between lubricant retention and oil film integrity.
2Reliability
If the connecting portion is formed with a small radius to reduce material, then manufacturing cost is reduced, but the oil film formation is obstructed and seizure resistance decreases
Solution Approach 1:
The radius of the connecting portions is set to a specific range (greater than 5 mm) to optimize both seizure resistance and manufacturing efficiency. This parameter specification ensures adequate oil film formation while maintaining reasonable material usage and manufacturability.
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 enhances seizure resistance by maintaining a stable oil film between the shoe and swash plate, as evidenced by increased seizure load measurements when radii exceed 5 mm.
Implementation Method 1
a shoe for a compressor with improved seizure resistance... oil film formation between the shoe and the swash plate... the edge may break an oil film
Implementation Method 2
a recess is formed in the sliding face of the shoe. These shoes can retain lubricant in the hole or recess
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
There is provided a shoe for a compressor with improved seizure resistance. The shoe for the compressor includes: a first sliding face 51 that slides on a piston 4; a second sliding face 52 that slides on a swash plate 3; and a recess 53 formed in the second sliding face 52. In a section along a height direction and scaled up 1000 times in the height direction and 10 times in a radial direction, a connecting portion 55 between the second sliding face 52 and the recess 53 is formed in a rounded shape with a radius R2 larger than 5 mm.