The relationship between vane motion and chamber pressure in a vane pump

Abstract

The relationship was studied between compression-induced vane motion, called vane jumping, and chamber pressure in a variable displacement vane pump. To clarify vane motion character: sties, three experimental methods were applied:(1) eddy current displacement measurements, (2) capacitive displacement measurements, and (3) high-speed video filming. The x- and y-axis eccentricities of the cam ring to the rotor were specifically focused on. These measuring techniques reveal that the vane tip clearance is proportional to x-axis eccentricity, and that its maximum value is 0.8 mm. Results also indicate the vane detachment angle lagged with increases in y-axis eccentricity. We conclude that a detached vane is caused by excess pre-compression in the dead-volume zone.