货箱与T式举升机构三角臂运动干涉分析

如果T式自卸车举升机构设计不当,在举升过程中三角臂和货箱可能发生运动干涉,甚至导致油缸等部件损坏.为此,从运动学和动力学角度研究了T式举升机构运动干涉问题,建立了考虑运动干涉的T式举升机构设计模型,分析了干涉存在时油缸推力变化情况,并开发了能够进行干涉检查的T式举升机构设计模块.     

东风自卸汽车举升油缸的修复

一辆东风EQ3092型自卸汽车,重载时举升困难,有时甚至无法举起货箱。该车型配装双列举升油缸,两只油缸分别支承在货箱与汽车大梁之间的举升油缸支承架两侧。     

重卡驾驶室举升油缸设计

文章介绍了重卡驾驶室举升油缸的结构和布置,通过有限元分析软件ANSYS对举升油缸支座进行强度分析,并根据分析结果对举升油缸支座结构优化。     

多级油缸在浮动油缸式举升机构自卸车上的应用

目前,浮动油缸式举升机构自卸汽车均采用单级单作用套筒式液压举升油缸,其代表车型是中国重汽K29/6×4自卸车,举升油缸内径200mm,工作压力16MPa,最大理论推力50.2t,车辆最大举升质量36t左右.     

多级油缸在马勒里式举升机构自卸车上的应用

目前,马勒里式举升机构自卸汽车均采用单级单作用套筒式液压举升油缸,其代表车型是重汽JN3261/6×4自卸车,举升油缸内径200mm,工作压力16MPa，最大理论推力50.2t,车辆最大举繁荣昌盛质量31t左右.     

基于自卸车整车模型中的举升机构动态仿真分析

在ADAMS中建立了基于整车的举升机构动态仿真模型，在考虑前后悬架刚度和阻尼以及整车质量参数的情况下研究了在举升过程中车辆自激振动时油缸推力的变化规律．为举升机构的动态设计提供了参考。     

基于ADAMS的自卸车举升机构优化设计

利用ADAMS软件中参数化建模与分析功能,建立了自卸车举升机构的参数化模型,以举升过程中工作油缸最大推力最小为优化目标,对举升机构的各铰接点位置布置进行了优化设计.     

太脱拉T815自卸汽车举升油缸的修理与改进

介绍了太脱拉T815自卸汽车举升油缸的结构与原理。在举升油缸使用一定时间后，其支承导向圈磨损或支承导向圈与缸筒内壁的联接处出现脱胶剥离，致使举升油缸不以正常工作。提出了相应的改进措施，例如，车削缸筒内壁凸台，将原密封沟槽加宽6mm，底径不变。     

前置举升自卸汽车的结构改进

通过分析现有前置举升自卸汽车车厢加长存在的主要问题,介绍了一款改进型前置举升自卸汽车,即在前置举升自卸汽车的基础上,中部增加一对辅助举升油缸,以提高车厢举升时的安全性与稳定性,并有效改变车厢底架受力状况。它对增加着力支点重新分配起到了应有的效果,是改善该类车型性能的一个新思路、新方法。     

比力多重型自卸车举升系统多级液压缸

意大利比力多(BLNOTTO)集团公司是重型自卸车举升系统多级液压缸的专业生产厂家。比力多公司年产销6万台液压缸,其中80％出口到世界各地,是欧洲第一大多级液压缸生产厂商。比力多集团公司拥有比力多和Mariz两个子公司,在全球100多个地区设有经销机构。比力多在欧洲拥有先进的生产线,能够满足市场对高压力产品的需求。产品的全部生产流程都由比力多公司自己生产完成,其产品设计结构有利于解决超载负荷、重载运输等问题。其产品结、性能、设计和工艺特点如下：比力多重载油缸设计采用德国无缝钢管,整体式结构加工而成,限位与油缸为一体,举升时不会脱缸。油缸内外经无心滚压抛光,表面光洁度达到0.05μm,密封圈使用寿命达到3-5年,延长了整个液压缸年限。各节油缸经同心机加工,精密度极高,油缸间隙小(0．07mm)．抗挠屈力大。油缸举升稳定,不漏油。缸体的表面硬度提高到280／300Hv／50gr,大大增强了使用强度,提高了举升能力和举升速度。举升的缸体加工工艺先进而细致,其和目前国内市场上产品在工艺上的对比如表2所示。     

体验长途行车加油难

"五一"期间,笔者所在单位组织员工自备车辆到洛阳、开封、焦作等地旅游.此前对限量加油早有所闻,但未曾亲历感受.通过本次远距离行车,感受颇多.     

货车折了一条"腿"砸歪公交一张"嘴"

8月21日下午,在浙江省温岭市泽坎线城东街道新开河路段,一辆行驶着的大货车前轮胎突然飞出,引发了两起交通事故,幸好无人员伤亡.     

Application of a thermodynamic model with a complex chemistry to a cycle resolved knock prediction on a spark ignition optical engine

A combination of experimental and numerical methodologies is proposed for the investigation of knocking in spark ignition engines to aid in better understanding the physical and chemical processes that occur and to exploit the capabilities of a developed computational tool. The latter consists of a thermo-fluid dynamics model, which is part of an advanced 1-D fluid dynamics code for the simulation of the entire engine, and a complex chemistry model, which can be embedded into the thermo-fluid dynamics model using the same integration algorithm for the conservation equations and the reacting species. Their mutual interaction in the energy balance will be considered. The experimental activity was carried out in the combustion chamber of an optically accessible, single-cylinder P.F.I. engine equipped with a commercial head. The experimental data consisted of optical measurements correlated to the combustion and auto-ignition processes within the cylinder. The optical measurements were based on 2-D digital imaging, UV visible natural emission spectroscopy and the chemiluminescence of radical species (OH and HCO). The engine parameters, the pressure signals of the related data and optical acquisition are compared on an individual cycle basis in the simulation by running the engine at a constant speed and varying the spark advance from normal combustion to heavy knock conditions.     

一起货车与轿车侧面恶性擦撞事故的分析

介绍了一起货车与轿车侧面恶性擦撞事故的损伤情况，分析了两车相撞的部位、相撞前的相对速度及事故原因。     

体验长途行车加油难

“五一”期间，笔者所在单位组织员工自备车辆到洛阳、开封、焦作等地旅游。此前对限量加油早有所闻，但未曾亲历感受。通过本次远距离行车，感受颇多。发车之前，在单位内将客车燃油箱加注满燃油（单位配有自用油库），燃油箱约容纳220L柴油，由于该车型为单位通勤客车，所以只配备单燃油箱（旅游客车一般配置双燃油箱），这也成为本次旅行中的一大缺憾。     

一种矿用车专用变速器设计

结合矿用车工况,提出矿用车变速器的开发要求,作为设计开发输入,据此设计了一种专用车变速器,并详细介绍了该变速器的结构和工作原理。     

Using a surrogate safety approach to prioritize hazardous segments in a rural highway in a developing country

Road safety is a global concern particularly in developing countries where some road sections are disproportionately more vulnerable in terms of the frequency and severity of crashes. Other than using historical crash data based reactive approaches, those sections need to be identified proactively, so that mitigation measures can be applied. Moreover, those approaches are sometimes questioned mainly due to data reliability issues in developing countries. The study reported here is aimed at highlighting the applicability of traffic conflict techniques as surrogate safety measures to identify those sections of a rural highway in a developing country, which are most likely at risk. An adapted framework is demonstrated to identify traffic conflicts using combined surrogate indicators acknowledging the limited resources and facilities in developing countries. A new model is put forwarded using a count data modelling approach. Both fixed and random parameters model derivatives have been explored as an alternative methodological approach to relate the factors affecting the number and probability of conflicts. The partial effects of individual independent variables were estimated to gain a better insight of their impact. The results show that the model can predict high risk segments in terms of probability of conflicts as well as safety risk, as well as prioritize road sections according to the likelihood of their safety level. The model provides a less expensive alternative to the collection of historical crash data in order to identify hazardous road locations or black spots on two-lane highways in developing countries.¹     

一种用汽油燃烧系统模拟发动机台架催化剂热老化的方法

采用通用汽车公司的快速老化程序RAT-A，分别在FOCAS燃烧系统及发动机上对催化剂在老化前和老化后的性能进行对比试验。结果表明，FOCAS燃烧系统能够对催化剂进行和发动机类似的老化。与发动机台架试验相比，FOCAS系统有明显的优点，如严格地控制空燃比使其变化幅度很小、空燃比稳定运行的范围宽、活动部件少及易操作等。