论文部分内容阅读
调试喷油泵前应用工艺喷油泵测试标定油量,这是提高喷油泵修理质量的一项重要措施。事实上,在不同的试验台上(普通条件下),均按其公称油量调试好的同一种型号的喷油泵,再在标准状况下复试,则会发现各台的循环油量不同,甚至差异较大。因为,调试规范规定的公称油量是指工艺喷油泵在标准状况下的油量。喷油泵的循环油量受调试现场许多因素影响,如环境温度、设备精度(转速波动率、转速表与计数机构的精度),试验台的油温,试验台上喷油器的开启压力、流量、高压油管内孔公差及长度等等。其中油温的影响最明显,以ZS4S_1型针阀偶件为例,当油温在0～50℃范围内变化时,温度每上升10℃,其200次/750转/分的油量约减少1毫升。
Before commissioning the fuel pump application process fuel pump test calibration of fuel, which is to improve the quality of injection pump repair is an important measure. In fact, on different test stands (under normal conditions), all the same types of injection pumps calibrated according to their nominal fuel quantity will be retested under standard conditions. Therefore, the circulating oil amount of each station will be different and even big different. Because, commissioned by the normative provisions of the nominal amount of fuel refers to the process of fuel pump in the standard state of the oil. The amount of circulating fuel in the fuel pump is affected by many factors on the commissioning site such as ambient temperature, equipment accuracy (speed fluctuation rate, tachometer and counting mechanism accuracy), temperature of the test bench, cracking pressure of the injector on the test bench, flow rate , High pressure tubing bore tolerance and length and so on. Among them, the influence of oil temperature is the most obvious. Taking the ZS4S_1 type needle and pin as an example, when the oil temperature changes from 0 to 50 ℃, the oil quantity of 200 times / 750 rev / min decreases about every 10 ℃ of temperature increase 1 ml.