Compressor piston and method for coating piston

Details Compressor piston and method for coating piston Compressor piston and method for coating piston

1999-12-08

2001-09-04

Ryznic, John E. (Department: 3745)

Expansible chamber devices

With lubricating means

Portion of expansible chamber device includes solid...

Reexamination Certificate

active

06283012

ABSTRACT:

The present invention relates to pistons for compressors that are used in vehicle air conditioners and to a method for coating pistons.
Compressors are employed in air-conditioning systems for vehicles. Piston type compressors are used in such systems. Pistons having no piston rings are known in the art. Such a piston directly contacts the wall of the corresponding cylinder bore and must have good sliding and sealing characteristics and high wear resistance. The surface of a ringless piston is therefore coated. The principal components of the coating include fluororesin and binder. The fluororesin permits the piston to reciprocate smoothly in the cylinder bore. The binder firmly adheres the coating layer to the surface of the piston.
The coating layer is formed by applying a coating material on a piston and curing it thereafter. Then, the coating layer is ground to make the thickness of the coating layer uniform.
The current methods for producing coated pistons have some drawbacks. First, the grinding of the coating layer requires precision and high manufacturing skills, which complicates the process of manufacturing of the pistons and lowers the production efficiency.
Also, the fluororesin in the coating layer is deposited in a zone proximate to the surface of the coating layer. Much of the fluororesin is thus removed when the surface of the coating layer is ground. The sliding characteristics of the piston may therefore deteriorate, which lowers the compression efficiency of the compressor.
SUMMARY OF THE INVENTION
Accordingly, it is an objective of the present invention to provide a piston that has improved sliding characteristics and a piston coating method that is highly efficient.
To achieve the foregoing and other objectives and in accordance with the purpose of the present invention, a piston for reciprocating in a cylinder bore of a compressor is provided. The piston includes a head for contacting a wall of the cylinder bore and a coating layer formed on an outer surface of the head. The coating layer includes fluororesin and a binder. The surface of the coating layer has a relatively high concentration of the fluororesin for reducing friction when the piston reciprocates.
In another aspect of the present invention, a method of coating a compressor piston is provided. The method uses a transfer member, a coating material that includes fluororesin and a binder, the coating material being applied to an outer surface of a head of the piston. The method includes separating the piston and the transfer member instantaneously when the coating material has been applied to the entire circumference of the head.
Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.


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