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Technical Paper

The Development of Fluid for Small-Sized and Light Weight Viscous Coupling

1998-05-04
981446
For viscous couplings(VCs) as a driving force transmission system of vehicles, requirement of torque characteristics has been getting very stringent. Because the torque characteristics significantly affect four wheel drive vehicles' abilities such as traction performance and driving stability. Furthermore, the recent concerns on high fuel economy, low pollution and low cost require that design of VCs should be increasingly compact, light weighted and excellent in transmitted torque's stability. It is an easy way to increase viscosity of viscous coupling fluids(VCFs) for the compact design of the VC. But it might cause increase in heat load and wear of plates which resulted in degradation of the VCF. The degradation affects VCF's viscosity and impairs stability in torque transmission. Therefore it is indispensable to develop high viscosity VCF which is excellent in long-term viscosity's stability.
Technical Paper

Method of Improving Side Impact Protection Performance by Induction Hardening of Body Reinforcement Compatibility Between Safety and Weight Reduction in Body Engineering

1998-02-23
980550
A technique for induction-hardening local portions of vehicle body reinforcements press-formed of thin sheet steel has been developed, with the aim of ensuring occupant safety in a side collision. This technique for increasing the tensile strength of sheet steel was practically applied to the front floor cross member and center pillar reinforcement. Owing to this method, the weight of body reinforcements can be decreased. New induction-hardening systems have also been developed for the present technique. One is an apparatus which allows induction-hardening a part with a three-dimensionally curved surface. Another is a straightening quench technique used to retain the same dimensional accuracy as the original press-formed part.
Technical Paper

Silicon Nitride Turbocharger Rotor for High Performance Automotive Engines

1990-02-01
900656
Toyota Motor Corporation has mass-produced turbochargers with silicon nitride ceramic rotors since October, 1989. Those turbochargers have been introduced into Celica and MR-2 which are Toyota sporty-type passenger cars. The designing of ceramic rotor was carried out in order to ensure the strength and durability of the component as well as to obtain the same aerodynamic characteristics as in the metal rotor. A moment of inertia was reduced by 60% using ceramic rotor which improved turbocharger response. The ceramic rotor was joined to metal shaft by new method which compensated problems in both shrink fitting and active brazing methods. High temperature strength of silicon nitride material was improved by controlling the amount of sintering additives and sintering conditions. The ceramic injection moulding was employed to mass-produce rotors with complicated shape, applying optimun binder compositions and moulding conditions.
Technical Paper

High Toughness Microalloyed Steels for Vital Automotive Parts

1989-02-01
890511
We developed new microalloyed steels, containing about 0.05% sulfur, which have excellent as hot-forged toughness even when forged at the temperatures of about 1300°C(2375°F). We also estimated the various properties of the new microalloy steel in the as hot-forged condition, comparing them to quench and tempered SAE1055 steel used in the front axle of a small truck. The results showed the new steel has improved yield strength, fatigue strength, absorbed impact energy and machinability over the SAE1055 steel.
Technical Paper

Development of Computer Aided Engineering for Piston Design

1989-02-01
890775
Computer Aided Engineering system for automotive piston design was developed which can predict total piston performance in a short time at the planning stage of piston design. Many previous studies attempted to calculate piston performance accurately with experimental data and their main purpose was not to create a tool for piston design. The purpose of this CAE system is to provide a tool for a designer to predict total piston performance easily and rapidly without experimental data. This system has following two characteristics. Firstly, new finite element methods were developed which can predict temperature distribution without experimental data, thermal skirt expansion for a strutted piston and skirt-to-bore contact pressure under engine operating conditions. The predicted result are accurate enough to predict piston performance at the planning stage of piston design.
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