权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Applicatin of a half-toroidal continuously variable transmission to an electric-vehicle drive-train and visualization of air-bubble behavior in the traction contact

半环形无级变速器在电动汽车传动系统中的应用以及牵引接触中气泡行为的可视化

基本信息

批准号：
07555373
负责人：
TANAKA Hirohisa
金额：
$ 0.45万
依托单位：
YOKOHAMA NATIONAL UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

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.

本研究的课题是应用机械式变速器，以最小的电功率使电动汽车获得最大的加速度。半环面无级变速器（CVT）具有速比变化快、噪声小的特点，适合于制动能量回收的快速响应和起步时的高加速性。本研究设计、制造了一种新型无级变速器，并将其应用于2.2kw电动汽车。(1)在速比为0.4 ~ 2.5的范围内，转速为1500 rpm，转矩为10 ~ 40 N·m时，其传动效率为98%，转矩传递率为78%。通过理论分析，预测了传递扭矩的主要损失是由一对推力球轴承支撑传递扭矩造成的。(2)在此基础上，通过整车性能试验表明，CVT装置使200 A、36 V的最大起动功率持续时间降低了20%，最高车速由20 km/h提高到40 km/h。在对牵引液进行基础研究的基础上，利用高速摄像机成功地对小气泡进入薄膜间隙的行为进行了可视化。小气泡的主流避开差距，但其中10%通过变形其形状而穿过差距。这将是在高赫兹压力接触下的瞬时温度升高的原因，由于牵引流体的气泡消除能力的缺乏，有时在高温下会经历这种瞬时温度升高。