Lobe pumps have a more pulsating output than external gear pumps and are less subject to wear.
Lobe pumps resemble external gear pumps, but have rotors with two, three, or four lobes in place of gears; the two rotors are both driven.
Broaching is particularly suitable for internal surfaces such as holes and internal gears, but it can also shape external gears and flat surfaces.
A typical mechanical booster utilizes two figure-eight-shaped impellers, synchronized by external gears, rotating in opposite directions inside a stator.
Therefore, manufacturing is more difficult than external gears.
This article describes the technique of modelling external gear pumps that operate with non-Newtonian fluids.
Finally, operation of external gear pump with fluids having different viscosity characteristics is discussed.
The external gear materializes a left and a right hand gear as well as a spur gear.
Internal gears have some advantages such as low sliding velocities, low contact stresses, high contact ratios compared with external gears.
This paper presents a study on the design of spur gears with asymmetric teeth in external gear pump applications.
For this reason, this work investigates cavitation in external gear machines by means of a dedicated experimental campaign.
