重型货车变速器壳体轻量化技术研究

重型货车变速器壳体是变速器的重要组成部分,占变速器总成质量的30%~40%,重型货车变速器壳体轻量化对整车传动系轻量化设计而言具有重大意义。对比了变速器壳体几种不同工艺的优缺点,对12挡筒式结构的双中间轴结构变速器壳体进行了CAE分析;采用铝合金材料的壳体经过加筋设计和改进,变速器总成减重效果可达26.6%;介绍了不同螺栓-螺纹连接对铝合金壳体连接性能的影响。     

汽车变速器焊接修复工艺

<正>随着国民经济的发展及人民生活水平的不断提高，汽车已成为主要的代步工具，汽车变速器是汽车传动系的重要部件之一，汽车在行驶过程中由于路面颠簸、交通事故、金属疲劳等原因易造成变速器壳体及齿轮损坏。变速器壳体为铝合金材质，变速器齿轮为20CrMnTi渗碳钢材质，修配厂经过多年的攻关和经验积累，掌握了汽车铝合金变速器壳体及齿轮的焊接修复技术。     

玉柴6105QC柴油机飞轮壳断裂故障分析

一装用玉柴 61 0 5ＱＣ柴油机的东风杭州汽车公司制造的ＨＺ1 1 1 0Ｇ1六平柴汽车 ,发动机大修后不久 ,便常发生飞轮壳破裂故障 ,每次换上新飞轮壳 ,行驶运行不到 50 0ｋｍ就又发生同类断裂故障。一般来说 ,柴油发动机飞轮壳断裂是由于发动机或是汽车传动系某一部件动平衡失效而造成的。故此 ,我们对发动机的曲轴、飞轮、离合器、曲轴皮带轮减振器总成、水泵风扇叶片、变速器总成及传动系等部件逐一进行了检查 ,并散架重新校正了车架 (大梁 ) ,却均未找到故障源。接着 ,对发动机进行了动平衡检查 ,因没有动平衡仪 ,只好采用简易的方法。拆下…     

变速器壳整形修复中的尺寸链问题

变速器工作时,壳体受力情况复杂,处于一种复杂的扭曲状态。特别是当汽车在繁重的工作条件下用低档行驶和在紧急情况下使用手制动器时,变速器壳所受的力达到很大的数值而产生永久变形。变速器壳毛坯时效处理未达到规定的技术要求、修理过程中进行焊修或机加工不当,亦会引起变速器壳变形。     

有限元分析在汽车变速器壳体开发领域的应用

对变速器壳体建立有限元模型并进行强度和刚度分析,解决了由于传统设计时无法估算变速器壳体破裂、变形而造成的传动隐患。从而存设计开发阶段保证变速器壳体强度和刚度,大大缩短变速器的开发周期。     

自动变速器壳体设计及仿真优化

对某新型自动变速器壳体进行了结构设计.根据发动机、液力变矩器的联合输出特性,结合变速器各挡位的传动路线和液压控制逻辑,计算了在各挡位下变速器壳体分析所需的边界条件.利用所建立变速器壳体有限元模型,对变速器壳体进行了分析求解.结果表明,该变速器壳体经过多轮优化设计后,在最恶劣的工况下,除个别应力集中外,壳体的高应力区应力得到较大降低,壳体的最大变形也得到较大抑制.     

现代摩托车选购新知识新方法（二）

(7)传动系安全性能要求传动系主要包括离合器、变速器和后传动装置3个部件。离合器是用来切断和实现发动机曲轴与后传动装置之间的动力传递的装置。GB7258要求离合器应接合平稳,分离彻底,工作时不得有异响、抖动和不正常打滑现象。脱开离合器,手握力不大于200N。变速器的作用是     

EQ6100发动机飞轮壳频繁破裂的维修

东风EQ1092汽车在使用中多次反复发生飞轮壳破裂现象,其主要原因:一是曲轴—飞轮—离合器组件不平衡量超差;二是传动轴不平衡量超差;三是飞轮壳与缸体联接失效;四是变速器第一轴、第二轴后轴承松动造成变速器传动失衡。另外,介绍了飞轮壳破损后的修理方法。     

汽车传动系游动角度的检测

1.传动系游动角度检测的必要性 在传动系的组成部件离合器、变速器、万向传动装置和驱动桥中,都有啮合传动件,啮合件间都有严格的配合间隙要求.     

变速器噪声异常的分析研究

汽车NVH振动与噪声指标是评价汽车性能的重要指标之一,同时它直接影响着乘客的乘座舒适性和行驶的安全性.为了确保生产的产品在当前竞争激烈的汽车市场中占据优势,各厂商都对整车的NVH性能提出更高的要求.动力传动系是整车最为主要的组成部分,变速器作为动力传动系中主要传动部件之一,对传动系的振动和噪声性能有着极其重要的影响,本文通过理论分析并结合现场试验对某型变速器在整车上的异响进行分析,提出了解决措施,最终消除了异响,为开展变速器的减振降噪工作提供指导.     

某6×4搅拌车传动系优化匹配

针对某6×4搅拌车产品在市场上出现的离合器早期磨损、飞轮壳开裂等现象,从离合器、传动系速比、动力总成悬置三方面对该产品进行了传动系优化匹配。结果表明,优化匹配后的车型不仅解决了上述问题,而且有效地提升了产品的动力经济性。     

不同混合动力电动轿车方案的比较与分析

设计了同在离合器前与发动机的动力耦合的ISA并联、电机在离合器后变速器前与发动机的动力耦合的一般并联、类似于Prius的混联三种HEV方案。对这三种方案和原轿车的最高车速、原地起步加速特性等动力性指标和基于ECE＋EUDC的100km油耗和续驶里程等能量经济性指标及排施行性进行了仿真和分析。得到相应结论。     

汽车起步过程离合器传递转矩精确计算分析

在分析汽车起步时电控机械式自动变速器的离合器转矩传递过程的基础上,建立了汽车起步时离合器传递转矩、滑磨功和压盘表面温升的精确计算模型;推导出以离合器主、从动盘相对转速和离合器片表面温度为主要影响因素的离合器片摩擦因数的公式;以某一轿车为实例,对其起步时离合器转矩传递特性进行仿真计算。     

Method for precise controlling of the at shift control system

The shift comfort and efficiency of Automatic Transmission in vehicle are highly influenced by the pressure of the clutch shift control system, especially by the electro-hydraulic clutch subsystem. In this paper, the new design principles of electro-hydraulic clutch systems developed and modeled in detail, the clutch-to-clutch control system is analyzed in three time intervals: oil filled phase, changing phase of clutch torque and synchronous phase of clutch speed. The demand pressures for the engaged clutches calculated in each phase and is precisely built up by using fuzzy slide mode control, the time of hydraulic pressure building-up is very sensitive to the dither current in simulation. All control parameters are optimized by Cosimulation between software Simulink and SimulationX. Finally, the optimal algorithm of the clutch shift control is written into the transmission control unit of a testing vehicle. The testing results show that the suggested control strategy is effective.     

车辆换挡过程的离合器仿真研究

离合器是车辆传动系统的重要部件,在车辆行驶过程中它的接合与分离频繁,对它的控制是目前研究的重点之一。建立了整车模型中离合器的动力学仿真模型,分析了换挡过程中离合器的控制问题,在其控制策略中对离合器的控制与换挡动作进行了协调,并且综合考虑了换挡品质的三个评价指标;最后,运行建立的整车模型,在整车模型中进行验证,得到了换挡过程中与离合器相关的系列曲线,取得了较好的效果。     

双离合器自动变速器仿真研究

建立了双离合器自动变速器系统仿真模型,对双离合器自动变速器的动态特性进行了分析,并开发了换挡控制器。应用仿真软件对装有双离合器自动变速器的车辆进行了整车动态性能仿真。仿真结果表明,双离合器自动变速器具有和传统自动变速器相近的换挡品质。     

Dynamics Analysis of Torsional Vibration Induced by Clutch and Gear Set in Automatic Transmission

The torsional vibration generated during clutch engagement directly affects the shifting quality of automatic transmissions, where the noise source stems from both the clutch and the gear set. To predict the dynamical response and driveline oscillation, a comprehensive mathematical model of the vehicle powertrain equipped with automatic transmission is developed with consideration of nonlinearities in the clutch and the planetary gear set. For the clutch, the dynamics of stickslip is described for the transition between the slipping to locked states. The gear backlash model is used to analyze the rattle noise of the planetary gear set. Based on extensive powertrain simulations for the clutch engagement process, the magnitude of vibration propagation in the driveline are predicted to identify the primary factors of noise generation.     

Starting sliding mode variable structure that coordinates the control and real-time optimization of dry dual clutch transmissions

This paper researches the coordination of control between an engine and clutch at the system level to adequately reflect a driver’s intention and improve the starting performance of a vehicle equipped with a dry dual clutch transmission (DCT). Four-degree-of-freedom (DOF) starting dynamic equations are established for a dry DCT with a single intermediate shaft, and a two-DOF model of the sliding friction process and a single-DOF in-gear model of stable operation are obtained after simplifying these equations. Taking advantage of predictive control and a genetic algorithm, target tracing curves of the engine’s speed and the vehicle’s velocity are optimally specified online, and the starting sliding mode variable structure (SMVS) coordinating control strategy is designed to track these curves. The starting performance of a prototype car equipped with a dry DCT is simulated under different starting cases on the MATLAB/Simulink software platform. The simulation results show that the designed SMVS coordinating controller not only embodies driver intention and effectively improves the dry DCT car’s starting performance but is also highly robust when subjected to variations in the vehicle parameters.     

具有双离合器的液力变矩器的结构设计

将液力变矩器与机械式自动变速器合理匹配可组成一种新型自动变速系统，其性能接近自动变速器，但成本降低。为该系统设计了具有双离合器(闭锁离合器，换档离合器)的液力变矩器。阐述了该液力变矩器的结构、工作原理及特点。试验结果表明，所设计液力变矩器可支持新型自动变速系统成为现实。     

Conceptual design of economic hybrid vehicle system using clutchless geared smart transmission

Most hybrid vehicles employ the continuously variable transmission (CVT or eCVT) currently as their choice of the transmissions. Recently, an automated geared transmission (AGT) or dual clutch transmission (DCT) is being tried for some hybrid vehicles for the better fuel economy than the CVT hybrid. However, this AGT or DCT is using automated clutches which require the hydraulic power in addition to the slippage in the clutch plate invoking some energy loss as well as wear. Also, they require a motor with significant power to match to the engine power. The clutchless geared smart transmission (CGST) has no clutch and the clutch function is performed by a planetary gear system controlled by a motor-generator. The hybrid vehicles proposed here using CGST may have some merits in durability, fuel efficiency, and cost since they do not have clutches. The motor used for the clutch function can be also working for power merge with the engine in propelling the vehicle. The proposed hybrid system can be either mild hybrid or full hybrid by adopting a different capacity of battery with much smaller motor-generator due to the planetary gear system compared to the other type hybrid vehicles. In this study, the prospects of newly proposed CGST hybrid system are examined in practical aspects compared with AGT hybrid or DCT hybrid systems.