Power steering control valve mechanism

摘要

In a hydraulic pressure switch mechanism connected between a steering shaft and a rack, an input shaft is covered with a balance sleeve, to form a sealing portion. The balance sleeve is covered with a valve outer spool, thereby forming a variable orifice. The hydraulic pressure switch mechanism requires no valve inner spool. The hydraulic pressure switch mechanism has a small and simple structure and provides secure hydraulic pressure control, thus contributing to reduction in manufacturing cost.