Neutral valve for continuously variable hydrostatic transmission with Pressure compensated flow control and design methods for spool seat provided in the neutral valve

摘要

According to the present invention, compared to a conventional neutral valve, a control feeling and driving stability of a drive can be improved. Moreover, according to the present invention, a damper apparatus unit provided in the conventional neutral valve is not necessary to reduce components and simplify a structure. Therefore, a neutral valve can be miniaturized and lightened, and production and maintenance costs are reduced. In addition, a defect can be significantly reduced. According to the present invention, the neutral valve can be applied to all machine devices to which a continuously variable hydrostatic or similar transmission is applied in addition to an agricultural machine or construction machinery.