报告从宏观政策环境、地方政策动态、竞争对手情报、产品与技术创新等几个方面进行了分析及评论。

报告从宏观政策环境、地方政策动态、竞争对手情报、产品与技术创新等几个方面进行了分析及评论。

报告从宏观政策环境、地方政策动态、竞争对手情报、产品与技术创新等几个方面进行了分析及评论。

报告从宏观政策环境、地方政策动态、竞争对手情报、产品与技术创新等几个方面进行了分析及评论。

A wheeled tractor is a type of heavy equipment used to move asphalt, dirt, snow, logs, raw materials, debris, rocks, and sand during construction and mining activities. These tractors can be easily converted into loaders based on users' requirements. Various tools, such as dozer blades, buckets, and rippers, can be easily attached to the tractors to convert them into bulldozers, front loaders, and front-end loaders.

The tappet, also called a cam follower or valve lifter, is a component that runs on the camshaft, and is made to move vertically by the action of a rotating cam. It is a small part interposed between each camshaft lobe for the valve-lifting mechanism, which raises the valve off the seat. The side valves lift upward where the overhead valves are depressed to lift or open the side valves, and vice versa. As a camshaft rotates, each lobe produces both a vertical and a side thrust. In an overhead valve engine, the tappet is used low down in the engine block. From there, it drives a long thin pushrod up to the top of the engine, above the cylinder head.

Asia-Pacific automotive markets saw mixed performances in the first half of 2015, with the industry helped in some cases by government incentives to boost national economies, although this effect is liable to be transitory.

Bulldozer are also referred to as crawler dozers or track dozers. They are equipped with a blade and have the ability to push rocks and debris and to remove trees and clear ground. Bulldozers are used for different types of infrastructure-related activities in the construction of structures, in mines and quarries, and in other engineering projects.

以某轿车变速器的中间齿轮轴为研究对象,以变速器壳体支撑刚度为边界条件,建立弹性支撑条件下的齿轮轴总成有限元模型,并对该建模方法的合理性进行验证。通过临界平面法预估齿轮轴疲劳损伤分布结果表明,齿轮轴损伤较大位置与应力较大位置的分布基本一致;损伤最大值位于齿轮轴的花键齿根部,且远小于损伤临界值,齿轮轴疲劳寿命满足设计要求。台架寿命试验表明,该齿轮轴顺利通过试验测试,无失效现象发生。

对所研发的电动四驱混合动力汽车的几种工作模式进行了分析,该车工作模式包括自动起停、制动能量回收、纯电驱动、2WD驱动和4WD驱动以及换挡辅助等。在此基础上,基于系统效率最优原则,介绍了混合动力系统关键控制参数的设计,并通过实车转鼓试验对工作模式和设计参数进行了验证。

依据工业和信息化部"车辆生产企业及产品"公告库的技术数据,阐述了载货汽车整车参数特征。从配置参数、尺寸参数、质量参数3个方面进行特征分析,其中,配置参数特征包括发动机排量、发动机功率、整车轴数、轮胎数量、轮胎型号与总质量的统计关系;尺寸参数特征包括整车外形、货箱、轴距及其他尺寸统计关系;质量参数特征包括整备质量、载质量、载质量利用系数与总质量的统计关系。通过特征分析总结出一些参数规律和趋势,为载货汽车开发提供参考。

以某电动汽车为研究对象,建立了整车有限元仿真模型,并选取C-NACP全宽正碰工况进行碰撞仿真,通过有限元仿真方法分析了电动汽车在碰撞中高压电部件和高压电线可能存在的电安全性风险。结果表明,该电动汽车前舱内的PCU、驱动电机连接失效的风险较大,PCU外壳有被侵入的风险;多处高压电线存在挤压破坏风险,有可能导致漏电短路;DCDC接口弯折变形严重。