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浅析奔驰9速自动变速器725.0的结构与动力传输流程

发布: 2020-07-07 05:59:13   阅读: 次 【   

摘 要:通过对自动变速箱技术的回顾和市场发展需求分析,奔驰公司为应对市场竞争推出了9速自动变速器。对奔驰公司新型9速自动变速器725.0组成的各分系统做出了介绍,着重说明了电液控制系统,升降档控制,供油系统及应急运行模式。并对其有特色的机构和部件进行了详细说明,将变矩器锁止离合器,电液控制驻车止动爪,变速箱油冷却系统,电动变速箱油泵,变速箱油作为主要特色部件,描述了相关部件的工作过程及设计目的。分析了该变速箱的动力传输流程,对1-9前进档和倒档的动力传输过程做了详细的说明,对其中几个特殊档位的传递过程做出了详细的分析和设计目的说明,对各档位传动比的计算提供了计算依据,为维修诊断提供了基础信息。总结了该变速箱的优缺点以及与同类变速箱的横向对比,提出了该变速箱所具有的競争优势,并对未来多档位自动变速器的发展做出了一定的展望。

关键词:变矩器锁止离合器;行星齿轮组;电液控制驻车止动爪;传感器;完全集成式变速箱控制单元;电动油泵;动力传输

中图分类号:U467 文献标识码:B 文章编号:1671-7988(2018)06-153-07

Structure and Power Transmission flow of Benz 9-Speed automatic Transmission 725.0

Xu Yue

( Hangzhou municipal government auto repair service center, Zhejiang Hangzhou 310004 )

Absrtact: With a review of the automatic transmission technology and market development needs analysis, mercedes-benz to cope with the market competition launched 9 speed automatic transmission. For new Mercedes 725.0 9 speed automatic transmission of each subsystem has made the introduction, mainly illustrates the electro-hydraulic control system, lifting gear control, fuel supply system and emergency operation mode. Has distinguishing feature and the mechanism and components in detail, the torque converter lock up clutch, electro-hydraulic control in car locking claw, transmission oil cooling system, electric transmission oil pump, transmission oil as the main characteristic components, describes the work process of the relevant components and design purpose. Analyzes the transmission of power transmission process, 1-9 of the forward and reverse power transmission process in detail, for some special gear transmission process has made the detailed analysis and design purposes, calculation basis was provided for the calculation of the gear transmission ratio, provide the basis for maintenance and diagnostic information. Summarizes the advantages and disadvantages of the gearbox, and compared with that of the same kind of gearbox and puts forward the transmission of the competitive advantage, and in the future to the multi-position automatic transmission development outlook.

Keywords: Torque converter lock clutch; Planetary gear set; The electric fluid controls the stop claw; The sensor; Fully integrated transmission control unit; Electric pump; Power transmission

CLC NO.: U467 Document Code: B Article ID: 1671-7988(2018)06-153-07

前言

以行星齿轮组为传动结构的传统自动变速器自上世纪40年代投入规模使用以来,其基本地位从未象今天一样受到挑战,一直到本世纪初,还有大量的车型采用4速自动变速器,最大的改变可能是从液力控制转向电子控制,其中不少产品也是从老型号的液力控制改造而来。但随着汽车发动机功率的不断提升,节能减排的政策压力,为追求更好的燃油经济性和排放性能,从而对传动效率和舒适性提出了越来越高的要求。各汽车生产商之间竞争激烈,各种新结构的传动系统也对其垄断地位提出了挑战,如平行轴结构的DSG双离合变速器、无级变速的CVT变速器,虽然这些结构的变速器有其本身的固有缺点,但随着承载扭矩和功率的提高,不断侵蚀着传统自动变速器的市场份额。从本世纪初开始,传统自动变速器为了应对竞争,其档位在短短的十几年里有了快速发展,从4速逐渐提高到现在的9速,甚至10速,仍然在中高端车型中占据统治地位。奔驰作为仅有的几个自己开发自动变速器的整车厂家,在新推出的车型中开始使用型号为725.0系列的9速自动变速器,也是目前仅有的几款9速自动变速器之一,本文将对其具有特色结构、部件与动力传输流程做出介绍和说明。

 

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