TY JOUR TI RESEARCH OF HYDRAULIC DRIVE VALVES TIMING KW gas distribution mechanism KW hydraulic drive KW modeling KW experiment JO Vestnik of Kazan State Agrarian University AU Максимов, .А. AU Zimina, L.A. AU Adigamov, N.. AU Ziganshin, B.G. PY 2022 IS 17 PB Kazan state agrarian University