2007 Fiscal Year Final Research Report Summary
Torque Transmission Characteristics of a Power-Split Half-Toroidal CVT Box
| Project/Area Number |
18560128
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Design engineering/Machine functional elements/Tribology
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| Research Institution | Yokohama National University |
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Principal Investigator |
TANAKA Hirohisa Yokohama National University, Graduate School of Mechanical Engineering, Professor (90092262)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Machine element / Power transmission / Continuously variable transmission / Planetary gear set / Half-toroidal / Power split mechanism / Power re-circulation / Automobile |
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| Research Abstract |
Following to the actual use of half-toroidal CVT to 3L turbo passenger car in 1999, a fundamental study of torque transmission of power-split CVT has started since 2004. The power-split CVT, consisting of a variator and a planetary gear set, has features of extending the speed-ratio range and of improving the efficiency in high-speed cruising range. The purpose of this study is to examine the torque re-circulation of the PST-mode and the output-torque continuity at mode change from direct to power-split mode by using a test box with input torque capacity of 370Nm. We confirmed that the power-split CVT with a planetary gear set widen the speed-ratio range and the continuity of both the output torque and speed at mode change by using the test box of total speed-ratio ranges of 1:6.33 with a half-toroidal variator of 1:4.36 speed ratio ranges. The mode changes smoothly by controlling both the variator and clutches at the optimum point without torque surge within 0.3s.
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Research Products
(8 results)
