摘要
冷却水泵是现代内燃机的重要组成部分,为发动机的正常工作发挥了重要作用,作为冷却系统的动力源,驱动冷却剂在冷却水道及散热器间流动,带走燃料燃烧做功以外的多余热量,使发动机维持在一个合适的温度范围内工作,以达到最佳工况。
P11C系列是6缸直立、四气门、增压中冷式柴油机。其缸径122mm、排量10.52升,在日本已批量应用于日野大型客车、重型卡车和工程机械等动力装置,功率覆盖范围为240kw～280 kw,而且可以拓展至294 kw。P11C系列还具有日野发动机一系列新的技术,包括HMMS微混合燃烧系统、高强度球墨铸铁活塞、低摩擦传动副和减振等技术,在提高功率、降低废气排放同时,燃油消耗率达到195g/kw·h、噪声小于95db(A)、第一次大修里程突破100万公里。P11C系列发动机有动力强劲、清洁环保、节能耐用、使用成本低等卓越的性能和品质,将为客户和社会提供更大使用价值。
批量生产以后,P11C系列发动机冷却水泵暴露了许多质量问题,为了更好的满足顾客的需求,将各种故障模式汇总起来,进行分析、研究,并着手解决。冷却水泵的研究重点集中在它的功能部件水泵体上,水泵体的质量对水泵总成起着至关重要的作用。因此,从提高泵体加工的过程能力、改进产品结构等几个方面来改善它的质量。过程能力的提高主要着手工艺调整,同时刀具和夹具需要改进;产品结构的改进以试验为基础,通过试验获得数据,为改进提供依据,使水泵壳体既能刚性加强又不影响水泵流量和扬程,降低故障率,提高耐久性,以提高用户满意度。
The cooling water pump is an important constituent of the modern internal combustion engine, has played the vital role for the engine normal work. As cooling system power supply, the actuation cooling agent in cools between the canal and the radiator flows, Carries off outside the fuel burning acting the unnecessary quantity of heat, causes the engine working to maintain in an appropriate temperature range, to achieve the best operating mode.
So-called internal combustion engine“moderate”cooling, is refers to the internal combustion engine the main being heated part like piston, the cylinder cover, the cylinder liner and so on, after the cooling medium (water, air or lubricating oil) cools, its temperature maintains at some permission temperature range (the partial shipment truck hypothesis for about 90℃, The partial passenger vehicles are about 120℃). It is not only higher than this temperature range the upper limit, but also cannot be lower than its lower limit, to guarantees the internal combustion engine effective work.
Cooling water pump prime task principle, is leads the water pump rotation of axis by the engine crank or its transmission part, On water pump shaft impetus axial-tab terminal impeller in snail room internal rotation, The centrifugal force and the entrance produces which through the impeller have the suction, and inbreathe the refrigerant into impeller, to increases the pressure and the current capacity, enters the engine cooling pipeline.
The modern model cooling water pump consists of the water pump shell, the axis bearing, integral-type seal, water pump impeller, water pump cover, belt pulley etc. Divides into the alone writing style and the mosaic, Mosaic snail room is on the engine liner or front cover.
A lot of the centrifugal pump article can be found from domestic and overseas. These centrifugal pumps are widespread application in chemical industry, water power, agriculture, transportation, and daily life. Because the limits of the vehicle cooling water pump on its structure, it has these major characteristic, the rotational speed is high, the rotational speed scope is big, the use operating mode is complex, the price is low, production batch, so the vehicle cooling water pump has its own characteristic with the relatively generalized centrifugal pump
Through the research about quality improvement and analysyis that P11C engine cool water pump, the question of discusstion improved throughput of water pump, and product stucture is improved.
This research uses the author the newest introduction advanced water pump performance test platform in the author’s unit to carry on the data test and the confirmation. This test platform has the characteristics of the high accuracy; the reproducibility is good; operates simply and so on.
The flow of APQP is diparted five parts,its last part is“information feedback and put right step”,its input is information of feedback,output is reduced change、client satisfaction、delivery and service,its process is improved process.Betterment approximately is disparted process improvement and product improvement. The topic is from process; hat found problems, rocess improvement, and product improvement.
Process ability exponent CPK≤1.33,so process ability is not enough,and need improved. The improvement of process mainly starts at man, machine, material, means, ring, measure. The key of p11C engine cooling water pump is technoly adjusting, more concretely , is tools and clamp improvemet. The machining of seal hole and bearing hole is boring at a whack, from turning at a whack.The rigidity of boring machine is better to lath.More important,in process of turing worpiece is going round and round in high speed. On boring machine, the workpiece is immobile, but tooling is going quickly.Locomation will bring quake, and precision wil be reduced greatly.Comparely, tooling turing bring to machine is less to workpiece, so its precision is better to lath. The realization of process needs improvement of the tool and lamp. Produt stucture improvement is extended by process improvement.
Process ability exponent is low, but we can’t find the problem. So we have to doubt the product itself. For validating this and resolve it, by doing experiment grouping, we last arrived at conclusion that the product needs improved and the result of improvement is satisfying.
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