关键词: 拖拉机, 多路阀, U-半圆形节流槽, 动态特性, 泄漏量

Abstract: In order to solve the problems of large leakage and large vortex area of some tractor multi‑way valves, a tractor multi‑way valve with U‑semi‑circular throttle groove is designed, and the dynamic characteristics of U‑semicircular throttle trough tractor multi‑way valve are studied through simulation experiments. The results showed that the outlet flow of U‑semicircular throttle valve showed the characteristics of slow first, then fast and then slow. The steady‑state flow rate of the outlet of the multi‑way valve was 113 L/min, the flow change was stable without shock, and  the control characteristics were good. The test scheme of U‑semicircular throttle groove tractor multi‑way valve was formulated, and it was concluded that the pressure difference at the valve port decreased with the increase of the displacement of the valve core, and the minimum pressure difference at the valve port was 1.2 MPa. The maximum leakage of the multi‑way valve was 10.5 mL/min, which met the leakage index. Therefore, it was verified that the flow change of the U‑semicircular throttle channel multi‑way valve was stable and the internal leakage was small.

Key words:  tractor；multi?way valve, U?semicircular throttling groove, dynamic characteristics, leakage