Swash Plate Compressor Rolling Body DLC Film
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Solution Overview
Problem
Conventional swash plate compressors face issues with abrasion and seizure between the race and shoe due to lack of relative rotation, leading to peeling of the amorphous hard carbon film and increased friction, which affects sliding conditions and compressor efficiency.
Innovation Solution
A swash plate compressor design featuring a rolling body with a diamond-like carbon film on the surface in slide contact with the shoe and exposed base material on the surface in rolling contact with the bearing, reducing friction and preventing peeling, while the base material resists wear from rolling contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the race is pressed against the rollers by compression reaction force, then the rolling contact is maintained, but minute dents are formed on the race surface causing amorphous hard carbon film to peel off
Solution Approach 1:
The patent applies different surface treatments to different regions of the rolling body: the race surface is coated with amorphous hard carbon film for low friction, while the roller surface is left as base material to resist denting and film peeling. This local differentiation resolves the contradiction by protecting the film from peeling at the roller contact zone while maintaining the low friction benefit at the race contact zone.
Solution Approach 2:
The rolling body combines two material types: a soft, low-friction race surface coated with amorphous hard carbon film and a hard, dent-resistant roller surface made of base material. This composite structure allows each region to perform its specific function optimally without compromising the other.
2Loss of energy
If the amorphous hard carbon film is applied to the entire race surface, then friction is reduced, but the film peels off due to dents from rolling contact
Solution Approach 1:
The patent selectively applies the amorphous hard carbon film only to the race surface that contacts the shoe, while leaving the roller surface as base material. This local application ensures the film is present where low friction is needed (race-shoe contact) but absent where it would be compromised by rolling contact stresses (roller-bearing contact).
3Loss of energy
If the race surface is made smooth for low friction, then sliding resistance is reduced, but abrasion and seizure occur due to lack of relative rotation
Solution Approach 1:
The patent applies the amorphous hard carbon film specifically to the race surface portion that is in slide contact with the shoe, creating a low-friction interface where sliding occurs. The roller surface remains as hard base material to withstand the high stresses and lack of rotation at the bearing contact interface, thus preventing abrasion and seizure.
Solution Approach 2:
The rolling body combines a soft, low-friction coated race surface for sliding contact with a hard, wear-resistant base material roller surface for rolling contact. This composite approach allows the smooth race surface to provide low sliding resistance while the hard roller surface prevents wear from the absence of relative rotation.
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 sliding conditions, prevents abrasion and seizure, and reduces the likelihood of film peeling, thereby improving compressor efficiency and reducing maintenance costs by limiting DLC film application to specific areas.
Implementation Method 1
A surface of the rolling body in slide contact with the first shoe or a surface of the first shoe in slide contact with the rolling body has a diamond-like carbon film formed thereon
Implementation Method 2
reducing friction and preventing peeling
Implementation Method 3
The rotation of the swash plate is converted into the reciprocating movement of the piston through the rolling body and bearing
Implementation Method 4
The rolling body is mounted on the swash plate through a bearing
Implementation Method 5
reducing friction and preventing peeling
Data Source
AI summary
A swash plate compressor includes a housing that has a cylinder bore and rotatably supports a drive shaft. A swash plate is operatively coupled to the drive shaft for rotation therewith. A piston is accommodated in the cylinder bore for reciprocating movement. First and second spaced shoes are fitted to the piston on a side adjacent to the cylinder bore and on a side away from the cylinder bore, respectively, for coupling the piston to the swash plate. The rolling body is mounted on the swash plate through a bearing and in slide contact with the first shoe. A surface of the rolling body in slide contact with the first shoe or a surface of the first shoe in slide contact with the rolling body has a diamond-like carbon film. A surface of the rolling body in rolling contact with the bearing exposes a base material of the rolling body.