210 ウインチ巻き下げ時のカウンタバランス弁の安定性に関する研究

Abstract

In the oil-hydraulic circuit for the winch such as crane, the counter balance valve is used for putting a brake on the actuator. However, the oil-hydraulic circuit including the counter balance valve is instable, it is generally known to cause the oscillatory phenomenon easily. To provide stabilization of the counter balance valve, the damping of it is more effective in practice, however, it makes the response of the counter balance valve worse. Therefore the stability of the counter balance valve is developed on this study. At first, analysis model of the oil-hydraulic circuit for the winch including the counter balance valve is made and analysis result and experiment result are compared. Next, the stability of the counter balance valve is developed when the pattern of the variability orifice or annular clearance orifice of the counter balance valve is changed. In the consequence, it is approved that optimization of the damping of the counter balance valve provides stability and responsiveness of counter balance valve on a higher level.