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Mechanical seals have been applied as sealing devices for water pumps of automotive engines. The mechanical seal plays an important state. Therefore, there are many kinds of constructions. This paper is concerned with the FEM (Finite Element Method) analytical results for various water pump seal construction. It becomes clear that the property of heat transfer is closely related to the sealing durability.

A C-shaped seals is used under severe conditions in which rubber gasket and o-ring can not be used. Furthermore, C-seals exhibit various advantage such as small fitting space and light weight, therefore widely used as sealing elements for rocket engines and automotive engines. And also particular advantage offered by C-seals is good springback, high level of sealing performance under high pressure condition, stretching of the flange bolts. This paper is concerned of the sealing mechanism of C-seal by experimental work and finite element stress analysis. As a result, the lead coated layer on a C-seal has an important function on the sealing performance. In the present paper we describe on an interesting results reached by experiments regarding correlation of helium leakage late and contact pressure.

Mechanical seals have been applied as a sealing device for an automotive air conditioning compressor. Sometimes, the leaking trouble occurs under the conditions such as excessive wear, blistering formation and cracking phenomena on the carbon-ring. This paper is concerned with the analysis of cracking phenomena based upon Finite Element Method (FEM) calculation and experimental investigation.

C-shaped metal seals (C-seal) are used as static seals under the conditions such as high vacuum, high pressure, high temperature and cryogenic states. The correlation between the sealing performance and design parameters as loading force, deformation, and the surface roughness of ontacting faces have been investigated. This paper is concerned with the relationship between the surface condition of the coated-lead layer of C-seals and the surface roughness of mating flange. The effects of surface condition on leakage are examined fundamentally. Annular coated-lead layer on the surface of a C-seal prevents leakage, though there exist the fine defects or surface irregularities on the flange. It becomes clear from the test results that the surface conditions of the flange and loading force closely relate to the leakage rates with the deflection of C-seal under the. load and the behavior of the contact condition of flange surface.

The trend in high performance of automotive engines in recent years has been accompanied by a movement toward more compact size and lighter weight. This has created an ever more severe environment for cylinder head gaskets, demanding complex and difficult technological countermeasutes. In order to bring about necessary improvements in head gaskets, computer simulation was used to analyze their behavior and to carry out analysis of such matters as head rigidity and methods for tightening head bolts. This has made possible development of a highly reliable head gasket, and of related technology.