Investigation of Factors of Shifting Speed during Up/Down of Metal V-Belt Type CVT under No-Loading Condition

Yuichirou Mori･Kazuya Okubo･Kiyotaka Obunai (Doshisha University)

This paper shows an experimental study of the factors that change the shifting speed of a metal V-belt type CVT. The shifting speed was defined as the radial displacement divided by the tangential displacement of the belt in the pulley groove. Test results shows that the shifting speed was determined by the change of contacting position of the belt element. The change in ring tension was also contributed to change the shifting speed in case of speed up.

A Practical Prediction Method for Oil Delivery Distribution by Shaft Center Lubrication

Takafumi Kawamura (Computational Fluid Dynamics Consulting)･Takuma Kato (Chiba Institute of Technology)

A practical method for predicting the oil flow rate from multiple hole rows for oil delivery through a rotating shaft was investigated. A theoretical solution for the oil film thickness inside the shaft was obtained and its validity was confirmed by comparison with CFD calculations and experiments.

On the Gas-Liquid Two-Phase Flows Driven by a Simple Rotating Body

Kazuyasu Sugiyama (Osaka University)･Tomoaki Watamura (The University of Tokyo)

Experimental and numerical studies will be presented on gas-liquid two-phase flows driven by a simple rotating body. The global dependence of the flow pattern and the torque on rotational speed is arranged in a unified manner using a dimensionless number. Further, in consideration of the local distributions of oil and stress, the fundamental mechanisms that would make CFD prediction better are discussed,

Comparison of Various Computational Methods for Gear Stirring

Takafumi Kawamura (Computational Fluid Dynamics Consulting)･Tomoaki Watamura (University of Tokyo)･Kazuyasu Sugiyama (Osaka University)･Masaru Shimada (JATCO Engineering)･Tadashi Yamada (Toyota Motor)･Masanori Kato (Honda R & D)･Daiki Saegusa (Honda Motor)･Akira Nakashima (Mazda)

Experiments and numerical computations using various computational methods including particle methods, lattice Boltzmann method, finite difference method, and finite volume methods were carried out, and accuracy of these computational methods for gear stirring problem were assessed.

Development of Powertrain Unit Equipped with Transmission for Small BEVs

Misaki Minoha･Maki Hashimoto･Ryoichi Imai･Yutaka Kimoto･Kazutoshi Nakayama･Shinya Oomori (Exedy)

In the field of BEV, achieving desirable performance is possible by adopting a motor with sufficient output. However, for small mobility vehicles, the combination of a motor and transmission is considered effective due to various constraints. This presentation introduces a power unit that combines two types of simple-structured transmissions with a motor, catering to the specific needs of small mobility applications.