环保型铁道车辆用全封闭自冷式牵引电机

铁道车辆用牵引电机安装在转向架上,在粉尘和风雨等严格环境下使用。由于采用输入外气的冷却方式,所以每隔数年就要解体电机进行清扫。东芝公司为了适应维修的省力化、低噪声化及高效化的要求,开发了全封闭自冷式牵引电机。在行业内率先采用了油润滑轴承,并以热流体解析为中心,综合采用结构解析和磁场解析,简单地实现了高效冷却的新结构。业已在若干铁道公司的营业线上进行了现车评价。这次,则在新京成电铁公司正式采用该牵引电机。     

An investigation of the performance of an electronic in-line pump system for diesel engines

WIT Electronic Fuel System Co., Ltd. has developed a new fuel injector, the Electronic In-line Pump （EIP） system, designed to meet China＇s diesel engine emission and fuel economy regulations. It can be used on marine diesel engines and commercial vehicle engines through different EIP systems. A numerical model of the EIP system was built in the AMESim environment for the purpose of creating a design tool for engine application and system optimization. The model was used to predict key injection characteristics under different operating conditions, such as injection pressure, injection rate, and injection duration. To validate these predictions, experimental tests were conducted under the conditions that were modeled. The results were quite encouraging and in agreement with model predictions. Additional experiments were conducted to study the injection characteristics of the EIP system. These results show that injection pressure and injection quantity are insensitive to injection timing variations, this is due to the design of the constant velocity cam profile. Finally, injection quantity and pressure vs. pulse width at different cam speeds are presented, an important injection characteristic for EIP system calibration.     

长洲水利枢纽船闸设备配置对船闸维修的贡献

为适应西江航运繁忙和通航保证率高的需要，长洲船闸从电源设备、控制系统、起重设备、检修专用设备、航道清淤等方面优化配置，达到提高设备检修维护效率，减少船闸停运，提高通航保证率的作用。     

注重品质的华菱星凯马

星凯马是华菱公司从2006年开始研发打造的一个高端产品平台,主打高端物流车市场和海外市场,2009年11月份正式进入市场,当年即实现销售近1 000辆。星凯马是在华菱汽车第一代基础上的一次脱胎换骨的技术升级,全新的设计理念,瞄准欧美标准,具有自主知识产权技术的应用,拥有40多项国家专利。     

九月份沿海、内河其它规模以上港口客货吞吐量统计

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汽车前驱与后驱的优劣

<正>前轮驱动简称"前驱",是指发动机的动力直接传递给前轮而带动车辆前进的驱动方式。形象地说,就是前进时,前轮"拖动"后轮,带动车辆行进。前轮驱     

高速公路汽车轮胎爆破的原因及预防措施

详细分析了高速公路汽车轮台爆破的原因，并在此基础上提出了预防措施。     

企业文化建设与档案工作

在党的十五大精神指引下，随着我国社会主义市场经济体制的逐步建立和完善，许多企业都十分注重树立自我形象和企业精神。档案工作是企业文化建设的组成部分，如何把这两者有机结合起来，互相作用，以促进企业的发展，是当前探化企业改革，建立现代企业制度的需要，就此问题谈几点粗浅的认识。