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Continuously variable transmission leakage test results

100%

Goszczak J. , Radzymiński B. , Mitukiewicz G.

Acta Innovations

2019

tom no. 31

5--13

After a short introduction characterizing the general outline of the issue, this paper describes the test results of oil leakage measurements through CVT actuator seals. The research was done using Jatco company's CVT 7model, the popular gearbox for small passenger cars. Several curves of leakage values are given for both actuators, concerning different conditions such as rotational speed, oil temperature or pressure. In the summary several conclusions are formulated, based on presented test results. The determined maximal value of leakage is about 1 l/min. It emerged that the influence of centrifugal force is negligible. What is more, the observed phenomena are shortly described and projected for more detailed investigation.

Analysis of the Cruciform Sample Shapes for Bi-Axial Tensile Tests Based on the Geometries Currently Presented in the Literature

75%

Mitukiewicz G. , Kuzalski C. , Goszczak J. , Leyko J. , Dimitrova Z. , Batory D.

Advances in Science and Technology. Research Journal

2021

tom Vol. 15, no 2

156--168

The paper contributes to the global research of the best shape of cruciform samples for biaxial tensile tests. Based on literature research, one of the proposed samples’ shape comparison methodology was employed to achieve the ultimate results. A variety of specimens with different shapes were compared and modelled with the use of Finite Element Method (FEM). Afterwards, five the most promising sample shapes were examined on a tests stand to validate the simulation results. Based on the obtained research results a new parameter defining the ability of the cruciform sample to reach the possible achievable strain in the centre area, was introduced. The obtained data shows, that sample with the highest Relative Cost Function parameter (RCF) presented the highest strain in the gauge region and the sample with the lowest RCF reached the lowest strain in the center. The rest of the samples remained within the general trend showing a compatibility between the RCF parameter and the obtained strain.