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This paper describes Computer Aided Expert System for Designing transmission. Design knowledge is classified into 2 groups - “CLASS FRAME” showing the concept relative with subject of study and “INSTANCE FRAME” displaying some examples together with knowledges in the form of diagram defined on frame as image data. These data were hierarchically sorted out for problem reduction and very effective and easy to understand knowledge representation was achieved. Besides that, experimental knowledge was processed by either probability theory based on parameter of certainty factor determining the quantity of specified information by using predicate logic or fuzzy inference using membership function both of which, in turn, made it possible to obtain reasonable and still yet optimum answer. Expert tool of personal computer can be employed for this system, and external program such as gear specification calculation program or gear stress calculation program can be executed by any user.

Mechanical seals have been applied as a sealing device for an automotive air conditioning compressor. However, the leaking trouble occurs under the conditions such as excessive wear, blistering formation and cracking phenomena on the carbon-rings. This paper is concerned with a study of carbon-cracking phenomena.

A lip seal for use in high-pressure automotive air conditioning compressors has been developed. This paper describes the design and the sealing performance of this new lip seal.

End-face type seals (mechanical seals) have been applied as a sealing device for the automotive air conditioning compressor. However, in the practical market, oil or gas leakage from sealing devices sometimes occures based on blistering phenomena of carbon piece and lubricating conditions between rubbing surfaces. The paper presents good sealing performance for the developed face type mechanical seals.

On behalf of a face-type seal (mechanical seal), a new lip type seal for an automotive air conditioning compressor was developed. The paper presents good sealing performance and fundamental of designing for the new seal.