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.

Hydraulic drive for multi-axle vehicles

Abstract: In a vehicle having driving wheels mounted on different axes and a power plant, the latter is drivingly connected to the input shaft of a differential pump the output shaft of which is mechanically coupled to the driving wheels on one axis, and the driving wheels on the other axis are driven by one or more positive displacement hydraulic motors which receive fluid from the pump. The pump is a positive-displacement pump which has an output shaft rotating at a speed equal to that of the input shaft when the flow of pumped fluid is blocked, the speed decreasing progressively as more fluid is pumped, due to reduced external flow resistance. The two axes may be at the rear of the vehicle or, respectively, at the front and rear. When the hydraulic motors are of effectively variable displacement, the torque on the first-mentioned wheels remains about constant, in relation to that of the differential pump input shaft (except as this can be altered by the interposition of a mechanical gear shift), but that applied to the other wheels decreases as the motor displacement is decreased while the vehicle gains speed; concurrently, the speed of the former wheels increases. Fixeddisplacement hydraulic motors can be used. A by-pass valve across the differential pump, when opened, reduces the torques on all driving wheels essentially to zero.

Improvement of Lubrication Performance in External Gear Machines through Micro-surface Wedged Gears

Abstract: This article demonstrates how a properly designed micro-surface linear wedge added to the lateral surfaces of the gear teeth can improve the lubricating ability of external gear machines (EGMs), resulting in lower power losses and chance of wear during their operation. The approach of study is based on the use of a fluid structure interaction (FSI) model for the analysis of the lateral lubricating gaps developed in the authors' research team. Such a model is used to determine the best design of the wedged gear by considering the overall axial balance problem of pressure compensated EGMs for high-pressure applications. The article shows the numerical predictions along with the experimental verifications of the advantages offered by the proposed solution in terms of torque loss reduction for a particular reference pump.

Engine driven pump arrangement

Abstract: An internal combustion engine includes a drive connection for auxiliary equipment The equipment includes a step-down gear and a pump impeller of a coolant pump and a pump wheel of a lubricating oil gear pump situated on a common shaft The drive connection of the engine is characterized in that pump wheels of the lubricating oil gear pump form the step-down gear for the coolant pump

Dosing pump for blending two liquids

Abstract: A dosing system for precisely mixing two liquids in a predetermined volumetric relationship includes a flow meter having a fluid inlet, a fluid outlet, and two intermeshed counter-rotating gears positioned between the inlet and outlet. When a first fluid is directed from the inlet to the outlet, the first fluid causes the gears to turn, and the gears turn a predetermined amount for each unit of first fluid directed through the f low meter. The rotor of a peristaltic pump is coupled to one of the gears of the flow meter, such that for each increment of rotation of the gear, the rotor turns to pump a predetermined amount of a second fluid through the peristaltic pump. The outlets of the two pumps are in fluid communication, to permit mixing of the predetermined amounts of first and second fluid.

Thermo-cementing and folding machine

Abstract: In a thermo-cementing and folding machine, a gear pump (26) operates to supply adhesive at a rate which is dependent upon the speed of rotation of a main drive shaft, by which workpiece feeding means of the machine is driven. The machine has also means (S6, 46 to 50) for varying the rate of feed of a workpiece by the workpiece feeding means without varying the speed of rotation of the main drive shaft. The ratio of the rotational speed of the shaft to the operating rate of the pump (26) is varied in response to variation of the workpiece feed rate. This arrangement is achieved by computer control (E, RAM, ADC, CPU, O/P, SMD), the gear pump (26) being driven by a stepping motor (M) for this purpose. In addition, at the end of each work cycle, use of a stepping motor facilitates 'suck back' of adhesive, and a 'fast forward' adhesive upon initiation of the next work cycle.