| 摘要 |
PURPOSE: Structure of a sleeve valve passage of a power steering system is provided to minimize a swirl of a fluid when the fluid flows out from the sleeve through a valve passage of a sleeve and to prevent the fluid noise due to the swirl. CONSTITUTION: A guide face(102) constituted of multiple-stage inclinations is formed at a first expanding diameter portion(101) of a valve passage(3). Round portions are formed on both ends of the guide face. When a fluid flows out from a sleeve(2), the valve passage guides the fluid. The fluid guided by a third guide face(102c) is guided by a second guide face(102b) and diffused to the first expanding diameter portion. Thereafter, the fluid is guided by a first guide face(102a) and diffused to the outer circumference of the sleeve. The fluid smoothly flows out without the reduction of flow velocity. The guide faces prevent the formation of grooves. Therefore, a swirl and a noise are avoided.
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