Swash Plate Slanted Inner Periphery for Lubrication Distribution
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Solution Overview
Problem
Prior-art swash plates with resin film layers face issues in evenly distributing lubricating oil across the sliding surface, leading to insufficient lubrication and potential seizing due to the stepped inner peripheral design, which deflects oil back towards the inner peripheral part.
Innovation Solution
A swash plate design featuring a disc-shaped substrate with a coating layer where the inner peripheral part is formed as a slanted surface with angles θ1 ≤ 10° and θ2 ≤ 20°, allowing lubricating oil to flow smoothly from the inner peripheral side to the outer sliding surface, preventing oil deflection and ensuring adequate lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin film layer is formed on the substrate surface with a stepped inner peripheral design, then the coating layer can be applied, but the lubricating oil is deflected back and cannot be supplied to the entire sliding surface
Solution Approach 1:
The inner peripheral part of the coating layer is designed with a curved slanted surface instead of a stepped geometry. The surface slopes gradually from the inner peripheral side toward the outer side, with the angle between the slanted surface and the substrate end face controlled at 10° or less. This curved configuration allows lubricating oil to flow smoothly along the surface without deflection, ensuring adequate lubrication across the entire sliding surface.
2Reliability
If the inner peripheral part of the coating layer has a steep rising part (approximately 90° angle), then the coating can be formed, but oil supply to the sliding layer surface becomes insufficient
Solution Approach 1:
The angle parameters of the inner peripheral surface are precisely controlled: the angle between the slanted surface and the substrate end face is set to 10° or less, and the angle of the rising part adjacent to the inner edge is set to 20° or less. These parameter changes transform the steep 90° geometry into a gentle slope that facilitates oil flow while maintaining coating integrity and manufacturability.
3Reliability
If lubricating oil is supplied from the inner peripheral side, then the sliding parts can be lubricated, but the oil flow is blocked by the stepped structure
Solution Approach 1:
The coating layer is designed with different local geometries: the inner peripheral part features a slanted surface with controlled angles to guide oil flow, while the outer peripheral sliding surface maintains the necessary functional characteristics. This local differentiation optimizes oil distribution without compromising the overall device simplicity.
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 slanted surface configuration ensures effective lubrication distribution, preventing the swash plate from seizing up by allowing lubricating oil to reach the entire sliding surface, thus enhancing operational reliability.
Implementation Method 1
when the lubricating oil is supplied from the inner peripheral side and moves to the surface of the sliding layer in a circumferential direction outward along the end face of the substrate
Implementation Method 2
the oil travels over the inner peripheral part which serves as the slanted surface without being hindered, and is supplied to the outside of the sliding layers
Implementation Method 3
a coating layer which serves as a sliding layer for a surface which slides along a shoe
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
This swash plate (2) comprises a resin film layer (12) formed on the front surface (2A) and the rear surface (2B), and said resin film layer serves as the sliding surface which slides on a shoe (4). The inner periphery (12A) of the resin film layer (12) is a tilted surface which a lubricant can easily cross over. In other words, angle θ1 is 10° or less and angle θ2 of the rising part (12D) is set to 20° or less, and when the lubricant is supplied from the inner periphery side of the swash plate (2), said lubricant easily crosses over said inner periphery (12A) which is a tilted surface, and is quickly supplied to the surface (2A) (the sliding surface) outside of said inner periphery. Because the lubricant is quickly supplied to the front surface (2A) and the rear surface (2B) (the sliding surface) of the swash plate (2), seizure of the swash plate (2) can be prevented.