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EXPERIMENTAL STUDY ON HIGH-SPEED CHARACTERISTICS OF AUTOMOTIVE ENGINE OIL-PUMP CHAIN 总被引:2,自引:0,他引:2
CHENG Yabing MENG Fanzhong Chain Transmission Institute Jilin University Changchun China XU Hanxue WU Jianming Huzhou Qiujing Automotive Chain Drive Co. Ltd Huzhou China 《机械工程学报(英文版)》2007,20(1):36-39
The high-speed multi-cycle impact and speed, load fluctuant characteristics of a kind of narrow-width automotive engine oil-pump chain 06BN-1 are studied through engine assembly and road-drive tests to satisfy the light-weight demand of engine. The worn surface morphologies of rubbing area between pin, bush and roller are also analyzed based on scanning electron microscope. The results show that the main wear mechanism of automotive engine oil-pump chain is fatigue wear, and it's failure mechanism is the forming, extending and flaking of cracks on top layer of pin and bush. Pin and bush both occurred cycle-soften phenomenon, and roller occurred cycle-harden. Fretting wear is one of the most important "fall to pieces" failure causes of automotive chain. Ensuring sufficient strength and plasticity of roller, as well as adopting suitable shaping technology are the effective methods to increase its resistance to multi-cycle impact. 相似文献
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介绍了爱立信的下一代网络解决方案ENGINER4,该方案能满足中国电信对实验网的要求,可提供更广泛的业务能力。 相似文献
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EFFECTS OF COOLED EXTERNAL EXHAUST GAS RECIRCULATION ON DIESEL HOMOGENEOUS CHARGE COMPRESSION IGNITION ENGINE 总被引:1,自引:1,他引:0
SHI Lei CUI Yi DENG Kangyao Key Laboratory for Power Machinery Engineering of Ministry of Education Shanghai Jiaotong University Shanghai China 《机械工程学报(英文版)》2007,20(1):21-24
The effects of cooled external exhaust gas recirculation (EGR) on the combustion and emission performance of diesel fuel homogeneous charge compression ignition (HCCI) are studied. Homogeneous mixture is formed by injecting fuel in-cylinder in the negative valve overlap (NVO) period. So, the HCCI combustion which has low NOx and smoke emission is achieved. Cooled external EGR can delay the start of combustion effectively, which is very useful for high cetane fuel (diesel) HCCI, because these fuels can easily self-ignition, which makes the start of combustion more early. External EGR can avoid the knock combustion of HCCI at high load which means that the EGR can expand the high load limit. HCCI maintains low smoke emission at various EGR rate and various load compared with conventional diesel engine because there is no fuel-rich area in cylinder.. 相似文献
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ZI Xinyun JIANG Dahai DENG Chenglin Department of Automotive Engineering Tianjin Traffic Institute Tianjin China OUYANG Minggao YANG Fuyuan Department of Automotive Engineering Tsinghua University Beijing China 《机械工程学报(英文版)》2007,20(3):71-74
Experiments are conducted to develop an understanding of how split injections can affect the combustion and emission characteristics of a D.I. diesel engine with a common-rail injection system. The ratio of the amount of fuel injected between two injection pulses and the injection interval is varied keeping the injected fuel quantity constant. Results show that under the 70D90-10 injection pattern, the engine achieves the lower NOx-smoke emissions and BSFC compared with the single injection pattern. The heat release rate and the temperature show that the split injections increase the initial premixed burn and retards the diffusion burn. With the balance of these two effects, the maximum in-cylinder temperature decreases while the 50% heat release point is held at almost the same crank angle. Therefore, both NOx emission and BSFC are improved while keeping the smoke emission at the same level. 相似文献
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