Abstract: A rotary lobe pump is provided with an improved sealing mechanism between the rotor and outside diameter of the shaft upon which the rotor is mounted. An adapter is provided for the drive shaft which enables the drive shaft to be easily coupled to a variety of drive mechanisms. The adapter can be replaced with an alternative adapter suited to fit alternative drive mechanisms. An improved means for mounting the timing gears on the drive and driven shafts is provided which enables the timing gears to be easily adjusted during assembly to improve the rate at which rotary lobe pumps can be assembled. An improved shaft configuration is provided with a thicker boss section providing additional structural support at the timing gear. The shaft may be cast molded. An improved seal assembly is also provided whereby the seal is frictionally accommodated inside a sleevelike seal housing which, in turn, is frictionally accommodated inside the rotor.

Abstract: A rotary lobe pump is provided with an improved sealing mechanism between the rotor and outside diameter of the shaft upon which the rotor is mounted. An adapter is provided for the drive shaft which enables the drive shaft to be easily coupled to a variety of drive mechanisms. The adapter can be replaced with an alternative adapter suited to fit alternative drive mechanisms. An improved means for mounting the timing gears on the drive and driven shafts is provided which enables the timing gears to be easily adjusted during assembly to improve the rate at which rotary lobe pumps can be assembled. An improved shaft configuration is provided with a thicker boss section providing additional structural support at the timing gear. The shaft may be cast molded.