单向离合器在自动变速器中的作用分析

自动变速器在自动变换挡位时,动力传递不会中断．车速和发动机转速也不会立刻发生变化,所以换挡造成传动比突变时,必然会引起动力传动系统冲击,即换挡冲击。单向离合器在自动变速器中的作用是消除换挡时的降挡冲击,在消除换挡冲击的各种方法中．单向离合器是消除降挡冲击的最有效措施。     

辛普森式自动变速器结构原理及各挡位传动路线

不同车型自动变速器在结构上往往有很大差异,主要表现在：前进挡的挡数不同,离合器、制动器及单向超越离合器的数目和布置方式不同,所采用的行星齿轮机构的类型不同。前进挡的数目越多,行星齿轮变速系统中的离合器、制动器及单向超越离合器的数目就越多。离合器、制动器、单向超越离合器的布置方式主要取决于行星齿轮变速系统前进挡的挡数及所采用的行星齿轮机构的类型。轿车自动变速器所采用的行星齿轮机构的类型主要有2类,即辛普森式和拉维萘赫式行星齿轮机构。     

自动变速器执行机构的结构与原理

2.单向离合器 在汽车自动变速器执行机构中,除湿式多片离合器外,还有一种起单向止动作用的单向离合器.它可以是滚子式的,也可以是楔块式的.一般来说,前者使用得更为普遍一些.当然,在自动变速器中,单向离合器的使用还不仅仅局限于执行机构,例如,在液力变矩器的导轮支承处,也采用了单向离合器.     

对自动变速器中单向离合器引起的冲击现象的分析

单向离合器用于消除自动变速器中的降挡冲击,但在降挡过程中,单向离合器使动力输出中断,在无负荷工况下,发动机转速急剧上升,当单向离合器结合接通动力时,出现发动机对传动系的冲击,低挡位时出现的冲击能量大于高挡位。在单向离合器结合时,控制摩擦片打滑,推迟发动机点火,能够减轻这种冲击。     

国产轿车自动变速器维修技术讲座(二十六)

2001自动变速器换挡执行元件 在001自动变速器中有三个离合器、两个制动器和一个单向离合器。各换挡执行元件所控制的部件如图130所示和下表所示：不同挡位时，各换挡执行元件的状态如下表所示。     

自动变速器装配不当造成人为故障的案例分析(下)

三、漏装单向球阀,柱塞弹簧垫片方向装错,卡簧位置装错,错加ATF油!例一、漏装、错装单向球阀造成进倒挡和升挡时换挡冲击大一辆新款丰田陆地巡洋舰,搭载的是A343F自动变速器。在对自动变速器解体检修后,出现进倒挡和行驶中自动换挡冲击大的新故障。究其原因是漏装、错装一个单向球阀所致,如图5所示。如图5a所示,经2-3挡换挡阀控制的到直接挡离合器的油路中少装1粒单向球阀。如图5b所示,到直接挡离合器蓄压器的油路中多装1粒单向球阀。更正后按单向球阀正确位置装配后故障排除。单向球阀的作用是使它负责挡位的离合器、制动器结合过程中建…     

日产天籁自动变速器新技术(上)

一、自动变速器结构J31车型的自动变速器主要的一种规格是RE4F04B自动变速器。由于VQ35DE发动机的大排量、大扭矩,对RE4F04B自动变速器作了一些改进,以增强自动变速器的性能,结构示意图如图1所示。图1RE4F04B自动变速器结构示意图1.2-4挡制动带活塞2.倒挡离合器鼓3.变矩器壳体4.油泵5.制动带6.倒挡离合器7.高挡离合器8.前行星齿轮9.低挡单向离合器10.后行星齿轮11.前进挡单向离合器12.超速挡离合器13.低倒挡制动器14.输出轴齿轮15.输出轴惰轮16.前进挡单向离合器17.减速小齿轮18.主减速齿轮19.差速器壳20.输入轴21.变矩器22.后端盖23…     

丰田佳美自动变速器无倒挡故障排除

一辆装备A540E型自动变速器的丰田佳美3.0轿车,因无倒挡故障检修装复后,又出现其它两挡无驱动反应现象。经失速试验、液压系统压力测试及挡位试验后,确认是自动变速器中单向离合器装反所致。分析了单向离合器装反导致故障产生的原因,并提出了两种辨识单向离合器装反的简易方法。     

用杠杆法分析自动变速器的换挡过程

介绍了一种分析自动变速器换挡过程的新方法。将自动变速器中的行星传动机构简化为等效杠杆,利用等效杠杆的受力平衡图和转速关系图,可以直观判断单向离合器的接合或分离、换挡执行元件的工作状态以及动力传递路线。用等效杠杆法对日本丰田A340E电子控制自动变速器换挡过程的分析表明,采用单向离合器作为换挡执行元件的自动变速器的换挡过程非常简便。     

奇瑞Ⅱ代4HP14自动变速器的检修(二)

6 自动变速器动力传递 (1)D位1档时动力传递路线 离合器A接合,发动机动力经液力变矩器涡轮和涡轮轴、太阳轮轴,与后太阳轮连接;行星架在1档单向超越离合器逆时针方向的锁止作用下固定不动,后太阳轮带动短行星轮,传给长行星轮齿圈和输出轴。 (2)1位1档时动力传递路线 制动器D接合,行星架由制动器D锁止。利用发动机怠速运转阻力实现发动机制动作用。     

自动变速器离合器的模糊控制

对汽车起步过程中的离合器进行多目标函数综合化，能够对控制目标进行全面评价，在此基础上，对机械式自动变速器中的离合器采用变量化因子模糊调节与变系数比例调节相结合的控制方法，不但实现了汽车的平稳起步，同时也延长了离合器的使用寿命。     

插电式混合动力汽车动力系统总体设计

插电式混合动力已成为新能源车型发展的主流。文章以一款中级前置前驱插电式混合动力轿车为例,给出了动力总成总体设计方法,对行星轮机构、电控离合器及单向离合器等几种动力总成复合装置方案进行了对比,针对所选定的结构方案分析了相应整车工作模式,对动力系统性能进行了仿真,确定了动力系统总体方案。     

Development and implementation of a torque vectoring algorithm for an innovative 4WD driveline for a high-performance vehicle

The sporting spirit that characterises a high-performance car can be observed in certain technical solutions. The power distribution on the rear wheels is the simplest example of that. It is well known that rear-wheel drive (RWD) vehicles are more fun to drive and faster in their reactions. Unfortunately, they are also less intuitive and harder to control because of their natural oversteering behaviour. The idea of maintaining an RWD driveline in the future is not farseeing, because it would imply an excessive tyre dimension increasing to let the driver use all engine power in many cornering and low-friction conditions. The choice of adopting a part-time all-wheel drive (AWD) driveline comes from the will of enhancing the overall performance by using all the available friction every time that it is needed. It has to be kept into account that a normally aspirated motor of a sport car can supply 500–600 Hp nowadays, and that it will supply 700–800 Hp in the very near future. However, the proposed driveline has not to worsen the weight characteristics (mass and load distribution) that make an RWD vehicle better than other cars. Because of all these considerations and constraints, a new driveline system has been designed. It derives from an RWD driveline with a semi-active differential, to which has been added a controlled wet clutch that directly connects the engine to the front differential. This device allows the drive torque to be distributed between the two axles. It can be understood that in such a device, the torque distribution does not depend only on the central clutch action, but also on the engaged gear. Because of this particular layout, this system can not work in the whole gear range because of thermal problems due to kinematical reasons. So the centre clutch controller has to consider the gear position too. The control algorithms development was carried out using a vehicle model, which can precisely simulate the handling response, the powertrain dynamic, and the actuation system behaviour. Such a modelling precision required the development of a customised powertrain model library in Matlab/Simulink.     

Analysis of the shifting behavior of a novel clutchless geared smart transmission

Conventional geared transmissions use some kinds of clutches to control the power flow from an internal combustion engine to the driveline while shifting gears. However, the shifting performance is seriously affected by the clutch engagement and an unavoidable drop in the torque may occur when the clutch is disconnected. Moreover, wear of the clutch, the need for hydraulic equipment, and the load limit may together aggravate the limits of the clutch system. For this reason, as a novel transmission without a clutch, the clutchless geared smart transmission (henceforth CGST) is proposed by our research team. The CGST controls the power flow in a multiple-input gear-train by controlling the electric motor attached to the planetary gear system. However, no CGST has been realized in an actual vehicle thus far, and the performance has been predicted only theoretically. In this research, we analyzed the achievable performance based on a developed CGST dynamic model with a typical CGST structure. In addition, a CGST gear-shifting algorithm is proposed for use with the dynamic model. From the simulation results, the CGST does not show an abrupt drop in its torque or oscillation while shifting gears due to the absence of a discontinuous power flow. The developed dynamic model can serve as a performance reference for the CGST. Moreover, it can be used as a simulation tool for developing a gear-shifting control logic scheme.     

轿车离合器操纵机构

离合器操纵机构作为汽车中操作离合器的执行机构,对整车的动力传递及NV性能有着重要的影响。针对轿车的绳索式和液压式离合器操纵机构进行了结构对比,作为结构选择的依据,介绍了2种机构的优缺点和适用范围;同时为尽量减少出现设计不良,重点说明了绳索式离合器操纵机构的设计关键,为企业提高自身的开发设计能力提供了宝贵经验。     

四滚柱式超越离合器系统模糊可靠度计算

根据四滚柱式超越离合器的工作原理及每一个零部件的功能,作者将离合器系统简化为一个由外环、心轮与滚柱———弹簧子系统组成的串联系统,应用模糊数学的理论与方法建立了离合器系统模糊可靠度的数学模型并且给出了一个简单实例,并与用常规方法计算的离合器系统可靠度进行了比较。     

液力变矩器滑摩离合器控制压力计算方法

自动变速器中的滑摩离合器滑摩时发动机的动力同时通过液力传动和机械滑摩传动两条路线传递,它能够在大范围内提高传动效率。文中推导了汽车自动变速系统在滑摩过程中的功率平衡方程,并利用该方程计算了滑摩过程的控制油压,选择合理的滑摩控制区域能够显著提高自动变速传动系统的传动效率和缓冲、抗振性能。该控制区域应该从发动机的扭振状况、变矩器离合器的滑摩率和功率分配比、变矩器的输出特性以及自动变速系统的换挡规律多个方面进行考虑。     

风扇离合器的结构与使用

风扇离合器主要有通断型离合器和粘性油风扇驱动装置两类。详细介绍了气动风扇离合器、电磁风扇离合器和硅油风扇离合器的结构与原理，论述了风扇离合器在使用中的注意事项和调节型硅油风扇离合器、高速控制型风扇离合器、电磁风扇离合器一般故障的维修。