Fuel System New Diesel Fuel Injection Pump Head Rotor 146402-1420 VE Head Rotor for Auto Parts

As an important vibration source of the entire vehicle, the engine's NVH level directly affects the NVH level of the entire vehicle, so it is necessary to control engine noise. According to the engine noise problem, the noise and vibration generated by the high-pressure diesel pump are analyzed. Mainly by optimizing the transmission path of high-pressure diesel pump vibration to reduce the transmission of vibration, thereby reducing noise.

Analyze the engine noise on the timing side and determine that its excitation source is the high-pressure diesel pump, which is transmitted to the timing cover through the water pump housing to produce radiated noise. Analysis: The stiffness of the high-pressure diesel pump water pump housing, the tension of the timing gear train, and the stiffness of the timing cover all have an impact on the transmission of vibration. The water pump housing, the tensioning force of the timing gear train and the timing cover are optimized to reduce vibration and noise. The noise design test and analysis on the top of the engine were carried out, and the noise excitation source was determined to be the high-pressure diesel pump by using the wavelet analysis technology of the noise. The vibration of the high-pressure diesel pump is transmitted through the high-pressure diesel pipe, causing radiated noise from the top of the engine. After the transfer function test and the modal test of the high-pressure diesel pipe and high-pressure diesel pump, it was found that the high-pressure diesel pipe has a mode near the noise frequency. Collect the actual excitations at the high-pressure diesel pump and high-pressure diesel pipe, and perform forced response calculations on the cylinder block, cylinder head cover, high-pressure diesel pipe, high-pressure diesel rail, etc. The obtained noise cloud map on the top of the engine is consistent with the sound source location map, verifying that the high-pressure diesel pipe is the main noise source. In order to increase the stiffness of the high-pressure diesel pipe and move its resonance frequency away from the excitation frequency, a mass block is added to change the constraint state of the high-pressure diesel pipe.