Patent
Helical gear pump with specific helix angle, tooth contact length and circular base pitch relationship
TLDR
In this paper, a helical, positive displacement, external gear pump with a gear contact ratio greater than unity was proposed, where the space between two meshing gear teeth registers with the cutoff edge of the outlet port at one end of the space.Abstract:
A helical, positive displacement, external gear pump having a gear contact ratio greater than unity wherein the space between two meshing gear teeth registers with the cutoff edge of the outlet port at one end of the space and as it registers with the inlet edge of the inlet port at the opposite end of the space thereby eliminates the need for providing end plate recesses.read more
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Patent
Method for making herringbone gears
TL;DR: In this article, a method of manufacturing herringbone gears using an injection molding process is described, which involves the use of two separable mold halves each of which include a mold cavity for molding one half of the gear.
Patent
Rotary pump having helical gear teeth with a small angle of wrap
TL;DR: In this article, a rotary pump comprises a housing and at least a pair of rotatable, meshing gears positioned within the housing, which define teeth which extend helically in the general direction of the axis of each gear rotation.
Patent
Helical gear pump or motor
TL;DR: In this article, a gear pump or motor for low noise generation employs helical gears (8 and 10) retained within a casing, the contact ratio and the helical advance of the gear teeth (which may be approximately 2 and 1, respectively) are such as to substantially prevent back-flow of hydraulic fluid from the outlet side to the inlet side.
Patent
Fluid displacement pump with backpressure stop
TL;DR: The fluid displacement pump enables substantially continuous continuous pumping from a low-pressure side to a high pressure side substantially without any backflow or backpressure pulsations as mentioned in this paper, without any need for backflow.
Patent
Screw compression flow guide for discharge loss reduction
TL;DR: A screw compressor includes a housing having a discharge port; and at least two rotors disposed in the housing for generating opposed discharge flows through the discharge port, wherein the discharge ports has edges defining a discharge opening, and wherein the edges are rounded so as to smooth flow of the discharge flows past the edges as discussed by the authors.
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Patent
Gear tooth profile
TL;DR: In this paper, a gear tooth profile and rotors for an external-tooth type of gear pump for fluids and gases are described, and a novel type of profile for the individual teeth or lobes of a rotor which is cooperatively engaged by another rotor having...
Patent
Helical gear pump or gear motor with optimal relief grooves for trapped fluid
TL;DR: In an external or internal gear pump or gear motor with one pair of helical spur gears, the risk for cavitation in the said enclosed tooth cavity is considerably reduced by the shift of the pressure port connected and the suction port connected relief grooves at the leading lateral face of the helical gears in the direction of the SUction port.
Patent
Volumetric type flowmeter having circular and involute tooth shape rotors
TL;DR: A volumetric rotary machine has a pair of rotors each of which has a plurality of teeth comprising tooth crests and valleys alternately disposed at equal angular intervals around the rotor in profile in a cross-sectional plane thereof perpendicular to the rotational axis thereof, which rotors are adapted to rotate in mutually opposite directions in mutually intermeshed state as discussed by the authors.
Patent
Fluid pressure system
TL;DR: In this article, a hydraulic system including a pump for continuous delivery of fluid under pressure is described, where the fluid delivered by the pump is simultaneously used for different purposes for which the fluid pressure requirements are different.