Study on Tooth Profile of Involute Conjugated Internal Gear for High-Pressure Internal Gear Pumps

2011 ◽  
Vol 328-330 ◽  
pp. 186-189 ◽  
Author(s):  
Wei Song ◽  
Hua Zhou
Keyword(s):  
High Pressure ◽  
3D Models ◽  
Tooth Profile ◽  
Volumetric Efficiency ◽  
Flow Pulse ◽  
Wear Life ◽  
Gear Pumps ◽  
Gear Geometry ◽  
Internal Gear

Conjugated internal gear is the key component of high-pressure internal gear pumps, which decides the performance of the pumps, such like volumetric efficiency, capacity of fluid discharge, wear life, flow pulse, vibration and noise. In this paper, a method of generating tooth profiles for conjugated internal gear is presented. Based on gear geometry and meshing theory, the parametric equations of involute conjugated internal gear are derived. With the help of MATLAB and SolidWorks, 3D models of the gear couple are built to evaluate the feasibility of the method.

Study on the Angle of Stationary Crescent for Radial Compensation of Inner Mesh Gear Pumps

2011 ◽  
Vol 317-319 ◽  
pp. 1438-1443
Author(s):  
Jian Zhuo Zhang ◽  
Kang Kang Li ◽  
Meng Gao ◽  
Tian Zi Zhu
Keyword(s):  
High Pressure ◽  
Pressure Distribution ◽  
Volumetric Efficiency ◽  
Hydraulic Pressure ◽  
Working Mechanism ◽  
Outlet Pressure ◽  
Hydraulic Force ◽  
Pressure Area ◽  
Gear Pumps ◽  
Internal Gear

Abstract：The working mechanism of the stationary crescent for radial compensation in the inner mesh gear pumps was studied in this paper. The force of the top and bottom stationary crescent in one hydraulic pressure changing cycle was analysed. The pressure distribution on the top and bottom stationary cressent in different positions and the hydraulic force at the x，y direction were determined.Under the condition of the force of the top and bottom stationary crescent is least and the two stationary crescents stay close to the tooth crest of internal gear and external gear to form radial seal，the angle of the end of the top stationary crescent in the high pressure area and the fixing angle of the seal stick was optimized. Experiment results show that the volumetric efficiency is 0.94 when the outlet pressure reach to 30Mpa, and the oil temperature is less than 55°C, there is no abrasion on the two sationary crescents and the tooth crest.

High-Pressure Gear Pumps

1946 ◽  
Vol 155 (1) ◽  
pp. 417-452 ◽  
Author(s):  
T. E. Beacham
Keyword(s):  
High Pressure ◽  
High Pressures ◽  
Journal Bearings ◽  
Volumetric Efficiency ◽  
Solid Matter ◽  
Excessive Pressure ◽  
Low Viscosity ◽  
Large Numbers ◽  
Gear Pumps ◽  
The Relationship

Gear pumps have been used in very large numbers for the various hydraulic services of war aircraft. For the higher pressures the main problems have been in connexion with the load on the journal bearings, with wear, and with the reduction in volumetric efficiency caused by internal leakage. The journal loads are affected by the number of teeth and by the ratio of width to diameter of the gears. With high pressures it is difficult to accommodate standard ball or roller races on account of their diameter: designs are illustrated using a combination of standard races and special needle roller bearings. Small amounts of wear cause comparatively large reductions in volumetric efficiency. Major causes of wear are rubbing on the gear end faces and solid matter in suspension in the liquid and methods of dealing with these are discussed. The percentage slip due to internal leakage varies inversely as the factor (r.p.m. × viscosity). At low speeds and with low-viscosity liquids, internal leakage often limits the pressure at which the pump can be used. Multistage pumps reduce the leakage and have been used extensively for undercarriage operation. Internal leakage becomes relatively less as the size of the pump is increased and the paper gives a graph, showing the relationship between the limit of pressure at which 80 per cent volumetric efficiency is possible, the capacity and rotational speed of the pump, and the viscosity of the liquid. Aircraft pumps generally use gears with involute teeth: ports in the end covers of the casing are used to prevent excessive pressure in the liquid trapped between the teeth. Low- and high-leakage conditions call for difficult arrangements of ports, and this involves differing displacements and variations in flow velocity.

Computerised Tooth Profile Generation of Conjugated Involute Internal Gears

2013 ◽  
Vol 572 ◽  
pp. 355-358 ◽  
Author(s):  
Cuneyt Fetvaci
Keyword(s):  
Computer Program ◽  
Mathematical Models ◽  
Tooth Profile ◽  
Tooth Surface ◽  
Gear Pumps ◽  
Tooth Surfaces ◽  
Internal Gear ◽  
The Given ◽  
Gear Profile

This paper studies the conjugated involute profile which are used in internal gear pumps. In this type of gear mechanisms, the internal gear profile is completely conjugate of the external gear profile. A composite line of action curve is obtained because the root fillets also play role in engagement cycle. The perfomance of the mechanism is increased. By applying consequent transformations, firstly the tooth surface of the generated external gear is obtained and secondly the tooth surface of the conjugated involute internal tooth surface is obtained. Also asymmetric tooth is considered. Mathematical models of generating and generated tooth surfaces are given. Based on the given mathematical models, a computer program is developed to obtain generating and generated surface. Conventional and conjugated involute profiles are compared.

Effects of Fillet on Kinematic Characteristic of Internal Gear Couple

2011 ◽  
Vol 130-134 ◽  
pp. 1128-1131
Author(s):  
Wei Song ◽  
Hua Zhou
Keyword(s):  
High Pressure ◽  
Kinematic Analysis ◽  
Gear Transmission ◽  
Kinematic Characteristic ◽  
Gear Pumps ◽  
Simulation Results ◽  
Internal Gear

Internal gear couple is the key component of high-pressure internal gear pumps, kinematic characteristic of which directly influences performance of the pump. Fillet is always ignored in the studies of gear transmission. This paper presents kinematic analysis of internal gear couple by using Adams which takes fillet into account. On the base of simulation results, the effects of fillet on kinematic characteristic of internal gear couple are concluded.

scholarly journals Development tendencies of clearance compensation methods in internal gear pumps

2021 ◽  
Vol 338 ◽  
pp. 01021
Author(s):  
Piotr Osiński ◽  
Michał Stosiak ◽  
Paweł Bury ◽  
Rafał Cieślicki ◽  
Krzysztof Towarnicki ◽  
...  
Keyword(s):  
Experimental Research ◽  
Mechanical Efficiency ◽  
Volumetric Efficiency ◽  
Positive Displacement ◽  
Compensation Methods ◽  
Gear Pumps ◽  
Design Solutions ◽  
Materials Used ◽  
Internal Gear

Contemporary gear pumps, although their design has been under development for over four centuries, keep being modernized and improved. The work presents an analysis of design solutions, taking into account their operational features. The analysis included units with internal mesh. Emphasis was put on the problem of ensuring high values of volumetric efficiency by minimizing leakage in the widest possible range of loads while maintaining the highest possible hydraulic and mechanical efficiency of the displacement unit. Increasing the volumetric efficiency of positive displacement pumps is an important factor in the pursuit of increase in working pressures in hydrostatic systems. An important factor in production of pumps is cost of their production, which often leads to possibility of introducing additional modifications in the pump structure. Often changes made to the materials used in construction of pumps, allow reduction in their mass or sensitivity to the action of the transported liquid. The paper indicates the developed and proprietary solutions in this area and presents the results of experimental research.

Improving the Characteristics of Gear Pumps: Part A — Discharge

2003 ◽  
Author(s):  
Ahmed M. M. El-Bahloul ◽  
Yasser Z. R. Ali
Keyword(s):  
Correction Factor ◽  
Helix Angle ◽  
Tooth Profile ◽  
Radius Of Curvature ◽  
Circular Arc ◽  
Pressure Angle ◽  
Face Width ◽  
Angle Change ◽  
Number Of Teeth ◽  
Gear Pumps

The main objective of this paper is to study the effect of gear geometry on the discharge of gear pumps. We have used gears of circular-arc tooth profile as gear pumps and have compared between these types of gearing and spur, helical gear pumps according to discharge. The chosen module change from 2 to 16 mm, number of teeth change from 8 to 20 teeth, pressure angle change from 10 to 30 deg, face width change from 20 to 120 mm, correction factor change from −1 to 1, helix angle change from 5 to 30 deg, and radii of curvature equal 1.4, 1.5, 2, 2.5, 2.75, and 3m are considered. The authors deduced that the tooth rack profile with radius of curvature equal 2.5, 2.75, 3m for all addendum circular arc tooth and convex-concave tooth profile, and derived equations representing the tooth profile, and calculated the points of intersections between curves of tooth profile. We drive the formulas for the volume of oil between adjacent teeth. Computer program has been prepared to calculate the discharge from the derived formulae with all variables for different types of gear pumps. Curves showing the change of discharge with module, number of teeth, pressure angle, face width, correction factor, helix angle, and radius of curvature are presented. The results show that: 1) The discharge increases with increasing module, number of teeth, positive correction factor, face width and radius of curvature of the tooth. 2) The discharge increases with increasing pressure angle to a certain value and then decreases with increasing pressure angle. 3) The discharge decreases with increasing helix angle. 4) The convex-concave circular-arc gears gives discharge higher than that of alla ddendum circular arc, spur, and helical gear pumps respectively. 5) A curve fitting of the results are done and the following formulae derived for the discharge of involute and circular arc gear pumps respectively: Q=A1bm2z0.895e0.065xe0.0033αe−0.0079βQ=A2bm2z0.91ρ10.669e−0.0047β

scholarly journals Design, Manufacture and Performance of Internal Gear Pumps : 1st Report, Non-Involute Type Pumps for Easy Manufacture

1983 ◽  
Vol 26 (217) ◽  
pp. 1253-1260
Author(s):  
Akira ISHIBASHI ◽  
Shigeru HOYASHITA ◽  
Jinichi IZUNO
Keyword(s):  
Gear Pumps ◽  
And Performance ◽  
Internal Gear
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