Patent ID: 8109748

Claim:
An external gear pump, comprising: at least one pair of mutually meshed toothed gears including a driving gear and a driven gear, each tooth of the gears being comprised of a root including two concave root sectors, with each of the concave root sectors being joined at an origin to a concave root sector of a neighboring tooth, and a top including a first side and a second side, with each of the sides of the top joined to a respective one of the concave root sectors by a first transition point, wherein each of the sides of the top includes two convex sectors joined by a second transition point defining a discontinuity in curvature of a profile of the tooth, wherein the teeth in mesh have at all times at least one primary bearing point by which the driving gear moves the driven gear, and at least one secondary contact point, and wherein the first transition point of one of the teeth in mesh is successively the primary bearing point and the secondary contact point in the course of meshing.