共查询到19条相似文献,搜索用时 140 毫秒
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1 无级变速系统技术及原理分析 1.1 无级变速机构简介无级变速动力传递机构主要由前传动和后传动 2大部分组成。如图1所示,前传动由前带轮、后带 相似文献
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由于结构限制,踏板车一般采用无级变速传动机构,最常采用齿形皮带无级变速器(见图1),与干式自动离心蹄块式离合器和二级减速传动装置配合使用。目前市场上较流行的踏板车,如豪迈125、五羊一本田WH125LZ和嘉陵-本田CH125等车型均采用V型齿形皮带无级变速传动机构(其内部结构如图2所示)。无级变速传动机构的速度随摩托车油门的大小(即发动机转速)改变而变化(见图3),相比骑式带挡位摩托车,采用无级变速传动机构的踏板车有着独特优势。 相似文献
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汽车无级变速传动(CVT)建模与仿真 总被引:22,自引:4,他引:22
从实时控制的角度出发,建立了汽车的无级变速传动夹紧力控制,速比控制及整车动态模型,基于这一动态模型,仿真计算了汽车在起步与行驶阻力变化时的动态调节过程,为进一步研究无级变速传动控制规律和进行电控系统设计提供必要的前期工作基础。 相似文献
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由于结构上的限制,踏板车一般采用无级变速传动机构,最常采用的是齿形皮带无级变速器,与干式自动离心蹄块式离合器和二级减速传动装置配合使用。无级变速机构的传动速比随摩托车油门的大小变化而变化,使用便捷。但随着使用时间的延长,特别是摩托车频繁加减速、爬坡、超载运行等,其自动离心变速器、齿形皮带和干式离心离合器极易磨损。因此,本文从以下几个要点,对无级变速传动机构的检修进行论述。 相似文献
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无级变速器(CVT)和普通自动变速器的最大区别,是它省去了复杂而又笨重的齿轮组合变速传动,变速机构的核心组件是两组锥形轮,通过改变主动锥形轮与钢制传动链条接触的半径进行变速。无级变速器的传动效率高且稳定,传动比可达5-6,传动效率可达95%,而采用液力变矩器的自动变速器传动效率只有87%左右。 相似文献
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轿车金属带式无级自动变速传动技术发展现状与趋势 总被引:12,自引:0,他引:12
在综合分析国外金属带式无级变速传动技术的基础上,阐述了金属带式无级变速传动技术的特点与应用概况2,比较分析了它的性能,传动效率,可靠性,寿命与成本等一些特点,阐述了该项技术今后的发展趋势。 相似文献
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无级变速踏板车自问世以来,由于其操纵简便、骑乘舒适,深受中老年和女性消费者的喜爱.然而,长期以来无级变速踏板车传动效率低、油耗居高不下,已成为世界性研究课题. 相似文献
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液压机械传动系统是一种可以实现自动换档的无级变速新型传动机构。在介绍了液压机械传动的组成和工作原理后,对该传动机构进行了运动分析,并说明了该系统的电子控制特点。 相似文献
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CVT--continuously variable transmission,即连续可变传动,它可以实现传动比的连续改变,称无级变速系统。无级变速系统多使用在踏板车型上。一、CVT的结构CVT的主要结构见图。CVT主要由主动皮带轮组合、驱动皮带、从动皮带轮组合、离心离合器等四大部分组成。其中主动皮带轮组 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(10):1518-1532
In this paper, a hybrid hydraulic passenger car (HHPC) coupled with a power split continuously variable transmission (P-CVT) is proposed. This P-CVT is capable of splitting the power from the internal combustion engine into mechanical and hydraulic power flows. By adjusting the ratio of the mechanical power to hydraulic power, the P-CVT enables the transmission ratio to be changed continuously. Meanwhile, the P-CVT system can capture the braking energy and store it in the hydraulic accumulator for the next assistant driving. In order to quantitatively investigate the effect of applying P-CVT on improving the fuel economy and operating performance for the HHPC, a numerical simulation is conducted under typical city driving conditions. The simulation results demonstrate that, the P-CVT permits the engine to be run under a more efficient operating range. The total fuel consumption of the HHPC is reduced by 16.4% under the test conditions, compared with that of the original car. 相似文献
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Vehicle Dynamic Analysis and Evaluation of Continuously Controlled Semi-Active Suspensions Using Hardware-in-the-loop Simulation 总被引:3,自引:0,他引:3
Sung-Ho Hwang Seung-Jin Heo Hong-Seok Kim Kyo-Il Lee 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1997,27(5):423-434
A semi-active suspension system with continuously variable damper is greatly expected to be used mainly in the future as a high-performance suspension system due to its cost-effectiveness, light weight, and low energy consumption. In this paper, to develop a suitable control logic for the semi-active suspension system, the hardware-in-the-loop simulation is performed for the experimental continuously variable damper combined with a quarter-car model, and the simulation results are compared for passive, on/off controlled, and continuously controlled dampers in the aspects of ride comfort and driving safety, assuming each damper to be installed on the vehicle. 相似文献
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为了使机电控制无级变速器(CVT)能够可靠地传递转矩,快速地调节速比,结合某车型的结构性能参数,对机电控制CVT电控电动执行机构的设计方法进行研究。首先,对机电控制CVT电控电动执行机构的结构和工作原理进行分析,说明电控电动执行机构对CVT速比和从动带轮夹紧力的调节方法,从运动学和动力学的角度研究从金属带式无级变速器的传动机理,获得速比与主动带轮可动盘位移的关系以及保证主、从动带轮可靠传递转矩所需要的夹紧力;然后,根据整车的结构性能参数,明确汽车对机电控制CVT的功能需求和性能要求,以电控电动执行机构中直流电动机的负载转矩最小为目标,设计确定各碟形弹簧的参数和组合形式,在此基础上确定电控电动执行机构中电动机械传动系统的结构性能参数;最后,为验证所设计电控电动执行机构参数的正确性,利用所建立的机电控制CVT传动系统模型在ECE工况下对电控电动执行机构的性能进行仿真分析。结果表明:相对传统CVT液压执行机构,在ECE工况下机电控制CVT电控电动执行机构消耗的能量减少52.2%,同时设计的电控电动执行机构在ECE工况下能够实现实际夹紧力和速比对目标值的良好跟随。 相似文献
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Continuously Variable Transmission (CVT) is one of the most promising automotive transmission technologies because of its
continuously variable gear ratio and reduced shift shock. CVT is different from Manual Transmission and Automatic Transmission,
and it is possible to operate the power source in its high efficiency region with CVT in the drive train. Several types of
CVT exist that can be categorized based on the mechanism of power transmission, such as the belt pulley, traction drive, and
hydrostatic types. This paper investigates the belt pulley CVT, which consists of a thrust actuator, driver pulley, belt,
driven pulley, and preload spring of the output shaft. A complete CVT is constructed, and based on that a simulation program
that analyzes the static performance of a CVT is implemented in Matlab/Simulink. From these simulation results, methods for
improving the efficiency of the CVT are discussed. The coefficient of the torque capacity factor is proposed as affecting
the matching between a power source and a CVT, and methods for improving the matching effect are also investigated. 相似文献