关键词: 液压相位器；中低转速；低油压；储油式腔；调节速度；噪音

Abstract: To solve the problems of low adjustment speed and adjustment noise of hydraulic phase shifter in low-speed operating conditions of the engine, this article analyzes the structure and adjustment mechanism of the phase shifter. Under low-speed operating conditions, the oil pressure is low and the fuel supply is low. Coupled with the influence of the alternating torque of the camshaft, the phase shifter produces negative pressure feedback during the adjustment process, resulting in a decrease in its performance. The scheme of adding an oil storage chamber on the outer side of the hydraulic phase shifter collects the oil discharged from the phase shifter. When negative pressure is generated in the internal oil chamber, the oil is replenished to the oil chamber through a one-way valve. Under the same testing conditions, the improvement plan improves the low-speed speed regulation performance by 30%～50% and significantly reduces the adjustment noise, which can better meet the low-speed performance requirements of the engine.

Key words: hydraulic phase shifter; medium low speed; low oil pressure; oil storage; shifting velocity; noise