1996 Fiscal Year Final Research Report Summary
Applicatin of a half-toroidal continuously variable transmission to an electric-vehicle drive-train and visualization of air-bubble behavior in the traction contact
| Project/Area Number |
07555373
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
設計工学・機械要素・トライボロジー
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| Research Institution | YOKOHAMA NATIONAL UNIVERSITY |
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Principal Investigator |
TANAKA Hirohisa Graduate school of Artificial Engineering of Environmental System, Professor, 工学研究科, 教授 (90092262)
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| Co-Investigator(Kenkyū-buntansha) |
MACHIDA Hisashi Nihon Seiko Co.Ltd.RESEARCH CENTER,RESEARCH HEAD OF CVT, 総合研究所, CVT室長
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| Project Period (FY) |
1995 – 1996
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| Keywords | ELECTRIC VEHICLE / CONTINUOUSLY VARIABLE TRANSMISSION / TRACTION DRIVE / TRACTION FLUID / ELECTRIC POWER SAVING / FLOW VISUALIZATION |
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| Research Abstract |
This research is a challenge of getting maximum acceleration of an electric vehicle with minimum electric power by applying a mechanically variable power-transmission. A half-toroidal continuously variable power transmission, CVT,has features of quick speed-ratio changing and quietness, which suits quick response for braking-energy recovery and high acceleration at starting. In this research, a new type of CVT is designed, manufactured and applied to an electric vehicle with 2.2 kw motor. (1) The performance test-result of the CVT is speed-transmission efficiency of 98%, torque-transmission of 78% at rotational speed of 1500 rpm and torque range of 10 to 40 N・m in the speed-ratio range of 0.4 to 2.5. The main loss of torque is caused by a pair of thrust ball bearings for supporting the transmitting torque, which is predicted by the theoretical analysis. (2) Next the vehicle performance tests clarify that the maximum electric power-duration of 200A,36V at starting is reduced by 20% and the maximum speed is increased to 40km/h from 20km/h by the equipment of the CVT.On the basic research of traction fluid, it is succeeded to visualize small bubble behavior running into thin film gap by using the high speed video-camera. Primary stream of small bubbles is avoiding the gap but 10% of them go through the gap by deforming their shape. It will be a reason of the flash temperature rise at high Hertzian pressure contact for which it is sometimes experienced at high temperature due to lack of bubble erasing capability of traction fluid.
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Research Products
(12 results)
