When cylinder block 1 rotates, pistons 2 reciprocate in its cylinders, held by centrifugal force and springs 3 against housing 4. Fluid is drawn in and discharged through bores a and d in stationary shaft 6. Flat spring 5 holds housing 4, turning about fixed axis A, in the position in which the pistons have their maximum stroke and the pump, maximum delivery. When the maximum pressure of the fluid is reached, it forces piston 7 downward, turning housing 4 clockwise and bending spring 5 back, until the geometric axis of the housing approaches the axis of rotation of cylinder block 1. When the two axes coincide, the pump delivery equals zero.
$4116$EHP,RP$