Gear pump

About: Gear pump is a research topic. Over the lifetime, 7490 publications have been published within this topic receiving 38837 citations. The topic is also known as: Gear pump.

Variable speed hydraulic pump system for liquid trailer

Abstract: The present invention relates to a hydraulic pump system comprising: (a) a variable displacement pump; (b) an engine used to drive the variable displacement pump; (c) a power takeoff unit for engaging or disengaging the engine from the variable displacement pump; (d) a hydraulic motor driven by the variable displacement pump via hydraulic fluid pressure; (e) a liquid pump driven by the hydraulic motor; (f) a hydraulic fluid cooler in communication with the hydraulic motor; (g) a hydraulic fluid reservoir in communication with the cooling means and the inlet the variable displacement pump; (h) hydraulic piping and/or hose for connecting the hydraulic motor, cooler, reservoir and variable displacement pump; and (i) filters located within the hydraulic piping and/or hose.

Aircraft main engine fuel pump with multiple gear stages using shared journals

Abstract: A multistage gear pump assembly (120) includes first and second gear pumps (140a, 140b) that use common shafts and are axially separated by a spacer plate (170) secured within a common bore (130) and secured to the housing (122). Pressurized bearings are provided at opposite axial ends of the first and second gear pumps. The second gear pump handles cruise and idle operations of the aircraft while the first gear pump stage assists in meeting higher demand modes of engine operation. Otherwise, the first gear pump is maintained at a minimal pressure to reduce energy consumption and still provide desired stability and eliminate issues associated with bearing oil whirl associated with prior known arrangements. However, when additional assistance is required, such as during takeoff, climb, or windmill relight, the first gear pump advantageously contributes to the increased pressure.

Internal gear pump

Abstract: An internal gear pump is disclosed having at least two essentially identical internal gears and a pinion meshing with the internal gears, all being rotatably disposed in a housing, the axial dimension of which is substantially equal to the width of the gear and pinion teeth. The housing includes a suction connection and a pressure connection. The internal gears have radial through-bores for the medium to be pumped. A support is provided at the contacting surfaces of the internal gears near the pressure connection.

Architecture for the hydraulic braking system of an aircraft

Abstract: The invention relates to an architecture for a hydraulic braking system suitable for an aircraft of the type having at least one group of main landing gear units, each landing gear unit comprising a determined number of wheels each provided with a hydraulically actuated brake, the or each landing gear group being associated with a hydraulic circuit provided with hydraulic equipment and adapted to deliver hydraulic fluid under pressure to all of the brakes of the landing gear group, the hydraulic fluid being pressurized by at least one aircraft pressure generator system associated with an aircraft hydraulic fluid supply. According to the invention, accumulators are connected on the or each circuit in sufficient number for each accumulator to feed two pairs of brakes, each pair of brakes being mounted on a distinct landing gear unit, and an electrically-driven pump being arranged to maintain a predetermined pressure level in all of the accumulators of the circuit in question.