Pressure angle

About: Pressure angle is a research topic. Over the lifetime, 1373 publications have been published within this topic receiving 10245 citations. The topic is also known as: angle of obliquity.

Effects of pressure angle on tooth deflection and root stress.

Abstract: This paper presents a study on the effects of pressure angle on tooth deflection and root stress. The analyses of tooth deflection and bending moment at root fillet due to a concentrated load on a gear tooth with various pressure angles were carried out by the finite difference method (FDM) and the results were compared with those measured. The validity of this analysis method was confirmed and the effects of pressure angle on the tooth deflection and bending moment were made considerably clear. The approximate equations for the deflection and bending moment due to a concentrated load on a gear tooth with various pressure angles were derived on the basis on the calculated and measured results.

The Influence of Cross Angle on the Flow Ripple of Axial Piston Pumps by CFD Simulation

Abstract: This paper studies the flow pulsation of axial piston pumps of different cross angles based on CFD simulation. The swash-plate cross angle of piston pump affects the piston pump outlet flow pulsation by changing the contraction amount of the plunger in the valve plate transition zone. First, we established the flow pulsation model with swash plate cross angle based on the noise reduction principle of the swash plate cross angle, and studied the influence of cross angle of different rotation angels on the flow pulsation based on CFD simulation. The conclusion is that the maximum and minimum peak of the flow pulsation decreased when the rotation angle of the cross angle is greater than 1 °; the maximum and minimum peak of the flow pulsation increased when the rotation angle of the cross angle is less than -1 °; a good noise reduction can be got when the piston pump cross angle rotates 1°.

Method of setting optimum number of teeth of helical gear, and helical gear

Abstract: PROBLEM TO BE SOLVED: To provide a method of setting the optimum number of teeth of a helical gear which can reduce unpleasant gear noise more effectively by taking into consideration the hearing characteristics of a human. SOLUTION: A gear ratio, a distance between centers, a pressure angle, and a torsion angle between a pair of helical gears are determined, and the relationship between the number Z of teeth of each of the pair of helical gears and the engagement rate eof the pair of helical gears are calculated based on the values. Then the sound pressure level L G of the gear sound at the engagement frequency of the pair of helical gears is calculated from the relationship, and the sound pressure level of the gear sound is compared to a sound pressure level at the audibility limit with respect to the engagement frequency of the pair of helical gears of the vehicle, on which the pair of helical gears are mounted, at a predetermined vehicle speed. Then a frequency range is selected where the sound pressure level of the gear sound is relatively lower than that of the audibility limit, and the number of teeth which corresponds with the selected frequency range is set as the optimum number of teeth. COPYRIGHT: (C)2007,JPO&INPIT

Simulation and Analysis about Different Pressure Angle in Involute Gears Based on Neural Network

Abstract: This article introduced neural network, discusses the neural networks model and its learning process. Using the MATLAB environment research and analysis the involute gear undercutting relationship, which under different pressure angles. In the number of teeth or modulus has been scheduled environment apply the nonlinear mapping characteristics of neural networks to involute gear undercutting do a more accurate simulation. This provides a theoretical basis for different pressure angle involute gear in gear transmission design.

Gear having small relative curvature at contact point

Abstract: In a gear, a tooth profile is adopted, in which the radius of curvature of a tooth surface is increased and decreased repeatedly from a point on the pitch circles toward the addendum and deddendum without being varied monotonously, with the center of the radius of curvature positioned on the pitch circles (2, 4) at a point at which the radius of curvature is minimal. More precisely, a tooth profile is formed, in which the curvature of the tooth profile curves (1, 3) is represented by a nonmonotonously varying, continuous and differentiable function with the locus of the curvature center forming a series of continuous curves which is usually located in the vicinity of the pitch circles. Owing to the tooth profile thus formed, it becomes possible to set the contact ratio of the gears to at least unity by gradually approximating the relative curvatures of the surfaces of the gear teeth from values of involute tooth profiles to that of Wildhaber-Novikov's tooth profiles, and prevent an increase in the surface pressure and bearing stress by reducing an operating pressure angle to a relatively low level. Since the relative curvature of the surfaces of the gear teeth can be kept small as compared with that of the surfaces of the conventional gear teeth, the strength of the tooth profiles can be increased greatly. This invention can be applied to not only an external gear but also an internal gear and a bevel gear.