提高汽车金属带式无级变速器效率的途径  

Approach to Improving Transmission Efficiency of MBCVT for Automobiles

作　　者：张伟华[1] 巩云鹏[1] 程乃士[1] 李树军[1] 

机构地区：[1]东北大学机械工程与自动化学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2009年第8期1181-1184,共4页Journal of Northeastern University(Natural Science)

基　　金：辽宁省自然科学基金资助项目(20052024)

摘　　要：分析了目前汽车金属带式无级变速器（MBCVT）传动效率未能得到充分发挥的原因,结果表明,现有的MBCVT的带轮轴向力是根据最大传递转矩来确定的,这样会使带轮轴向力过大,加大了液压系统的能耗.通过实验探索了其核心元件——金属带传动的滑差率和效率与传递载荷的关系.依据实验结果,提出了根据实际传递转矩施加带轮轴向力的方法：通过控制滑差率在9.6%-10.9%之间来调节带轮轴向力的大小,保证金属带传动始终工作在转矩比为0.8-0.9范围.这是其传动能力最强、传动效率最高的工况,可减少轴向力10%-46%,降低油耗5%-8%.Analyzes the reason why the efficiency of the metal belt continuously variable transmission（MBCVT） is not as high as it should be at present. It was found that the pulley thrust of existing MBCVT is determined according to the maximum torque transmitted, thus leading to the pulley thrust to be excessive with greatly increased energy consumption in hydraulic system. The transmission efficiency of metal belt transmission as the core part of MBCVT was investigated experimentally, and the dependence of torque transmitted on the slip ratio and transmission efficiency was obtained. Based on the experimental results, an approach was proposed to specify the pulley thrust in accordance with the actually transmitted torque, i.e., the pulley thrust should be regulated with the slip ratio in the range from 9.6% to 10.9%, thus providing the torque ratio range from 0.8 to 0.9, in which the metal belt transmission works restrictively. In this way, the MBCVT has the strongest transmission ability with the highest transmission efficiency, and decreases the pulley thrust by 10% -46% with fuel consumption decreased by 5 % - 8 %.

关 键 词：金属带传动 无级变速器 传动效率 滑差率 带轮轴向力 

分 类 号：TH132.32[机械工程—机械制造及自动化]