Abstract: A flow meter includes a rotor housing having an inlet, an outlet, and a bore extending axially through the housing from the inlet to the outlet, and a screw spindle arrangement including at least two rotary helical worm bodies which are disposed in the bore and which engage in a form fit manner within one another. A pulse generator is mounted on one of the worm bodies and triggers electrical pulses in the mating measuring transducer which are dependent upon the rotational speed of the worm body. The measuring transducer has a pulse-adjusting and pulse-shaping stage which adjusts the magnitude and/or frequency of the pulses relative to a volumetric flow rate of fuel to the bore. An electric counting mechanism receives the electric pulses from the pulse-adjusting and pulse-shaping stage and typically transmits these pulses to a display unit for display.

Abstract: There is proposed an installation for measuring quantities of liquid (of the liquid measuring motor type) with two cylinders of which the pistons cooperate by means of cranks. Each piston has a crankpin. To vary the crank radius of a crankpin and thereby vary the stroke of a piston for the fine adjustment of the traversing fluid quantity, the eccentricity of the pin is adjustable with respect to the crankshaft in two parts. To this effect, the pin pivots on a turning portion of an eccentric sleeve, said sleeve being closely connected by a worm screw to the crankshaft. Both pins are arranged on a guiding disc with an angle of 60.degree. with respect to their axes, they are supported by roller bearings and cooperate with the pistons which are connected to two mutually guided parallel cross-slides.