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Technical Paper

A Study of Sealing Mechanism on C-Shaped Seals

1992-02-01
920137
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.
Technical Paper

FEM Analysis of Mechanical Seals for Water Pumps of Automotive Engines

1992-02-01
920714
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.
Technical Paper

Analysis of Cracking Phenomena on Carbon-Rings of Mechanical Seals for an Automotive Air Conditioning Compressor

1991-02-01
910531
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.
Technical Paper

Sealing Phenomena of a Lip-Type Seal for an Automotive Air Conditioning Compressor

1991-02-01
910532
Instead of end-face type seals, lip-type seals have recently been widely applied as sealing devices for automotive air conditioning compressors, and have shown good sealing performance in practical applications. This paper is concerned with the sealing phenomena of lip-type seals, which run under hydrodynamic lubrication between the lip/shaft surfaces.
Technical Paper

The Influence of Designing Factors on the Sealing Performance of C-Seal

1991-02-01
910535
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.
Technical Paper

Development of a Low Frictional Mechanical Seal for Turbocharger of Automotive Engines

1990-02-01
900340
The turbo-charger of an automotive engine is commonly used for increasing its power characteristics. In this equipment, both sealing and lubricating conditions are important factors and face to difficult technical problems. This paper is concerned with sealing problem for the turbo-charger, and development of low frictional type mechanical seals with good performance and excellent reliability.
Technical Paper

The Effect of Coolant Additives and Seal Composition on Performance of Water Pump Seals of Automotive Engines

1989-02-01
890609
The mechanical seal in automotive water pumps is critical to the performance and reliability of the engine, requiring consistent, effective sealing performance and long operating life. In recent years, the advent of maintenance free performance requirements and increasingly severe operating conditions have resulted in significant changes to the variety and concentration of additives in cooling systems. As a consequence of these changes to the additives, various types of premature seal leakage failures have occurred during service operation. These have been categorized into four types of failure modes and compared with seals providing normal service in order to establish simulated test conditions for engine coolants containing various additives. This paper reports on the various types of failure mechanisms that were found to occur during simulated performance testing and the corrective measures that will eliminate their occurrence
Technical Paper

Analysis of Air-charging Efficiency for Developed New Type Super Charger Compressor on Automobile

1988-02-01
880562
There are various types of super chargers applied for mechanical charging system. Root system is the typical one of them, comprising some varieties such as vane type, spiral type, lysholm type, etc., each of which contains problems of consuming power, heat generation, wear- or other. It is now a big issue for the industry to overcome such problems and this paper refers to the effect of the vane type super charger (ESC-300) which could minimize such problems as less as possible.
Technical Paper

Sealing Performance of End-Face Type Seals for an Automotive Air Conditioning Compressor

1987-02-01
870513
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.
Technical Paper

Comments on Oil Seals for Engine Applications in Small Size Japanese Passenger Cars

1984-02-01
840191
According to the 1982 Japanese Engine Data Book, 249 automobile engine models are used, including gasoline and diesel engines. Among them, 87 models (approximately 60% of all 4-cycle gasoline engine models), are designed for small passenger car applications, with displacements between 1.51 and 2.00. This paper will highlight the area such as Seals for Automobile Engine Applications, Present Automotive Engine Seal Situation in Japan and Countermeasure Activity for Field Claims.
Technical Paper

An Influence of Reciprocating Motion of Rotary Shaft on Sealing Characteristics of Oil Seals for Automotive Transmission

1982-02-01
820144
It is clear that excessive lip wear is one of the origin of oil seal leakage in the market. In this paper, follows are discussed; Oil seals used for the rear side of automotive mission gear case have excessive lip wear as typical failure mode, and the sealing characteristics of oil seals is influenced by reciprocating motion of rotational shaft with rough surface.
Technical Paper

Development of Low Friction Oil Seals for Automobiles

1982-02-01
820142
Improvement of automotive fuel consumption is subject of saving energy today. Oil seals with low friction for automobile are required in the market. In this report, an idea for decreasing the friction of seals and its concreate countermeasure are discussed. It becomes clear that developed low friction seals have good sealing performance as same as present seals.
Technical Paper

Development of New Type Oil Seal for Automotive Application

1980-02-01
800531
New type oil seals - nonwoven fabric secondary lip type oil seals are recently widely used for one of the sealing apparatus for automotive application. Basic improvement of this type of seals is in a secondary lip which prevents solid foreign matters such as dust and sand from entering into the rubbing portion between a primary lip of oil seals and a shaft. This secondary lip is superior in anti-dust property, wear resistance, following ability to the shaft eccentricity and air permeability to the conventional secondary lip of rubber. And the sealing performance of new type seals with the secondary lip made of special nonwoven fabrics is more stable than that of the conventional rubber seals.
Technical Paper

Trouble and Countermeasure of Seals for Automotive Application —Part II

1980-02-01
800530
In order to improve the reliability of seals for automotive application in practical use, it is considered that further basic investigations concerning sealing characteristics of seals are necessary. However, it has been found, from analyzing seals decided in the market as defective parts, that the troubles of seals in the market are mainly caused by both wrong handling for seals and the use under wrong operating condition which has not been expected by manufacturers of seals. Therefore, in order to improve the reliability of seals, it is important to investigate in detail troubles on functional characteristics of seals and their countermeasures. In this paper, on oil seals, O-rings, water pump seals and dust cover seals as seals for automotive application, the results of investigations are discussed.
Technical Paper

A Study of Lubrication Characteristics on Valve Stem Seals for Automobile Engines

1979-02-01
790350
Valve stem seals are important to control consumption of lubricating oil for engines and to prevent an air pollution problem by unclean exhaust. It is required for valve stem seals to have stable characteristics of a controlled oil leakage related to frictional characteristics. In this papor, the concept of designing valve stem seals which possess the above characteristics have been discussed by applying an inverse problem of hydrodynamic lubrication.
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