VANE TIP DETACHMENT IN A POSITIVE DISPLACEMENT VANE PUMP

This paper reports on the theoretical study of the transient chamber p ressure and vane motion in a positive displacement vane pump which wid ely used in the automotive power steering systems. For analyzing the v ane detachment, dynamic equation of vane motion and flow continuity eq uations are derived and then solved simultaneously using the numerical integration. Vane detachment is shown to be a function of the chamber pressure, rotational speed, and the design geometry of pump. Vane det achment occurs due to excess compression of chamber volume, and it can be reduced by adjustment of design parameters. Specially, silencing V -groove in side plate and radius reduction ratio of compression zone i n the cam ring are important design factors for reducing the vane deta chment.