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.

Test device to pulley class set of component edge intensity

Abstract: The utility model relates to a pulley component part testing field, concretely relates to test device to pulley class set of component edge intensity, the on -line screen storage device comprises a base, the pressure balance board, fixing bolts, the sleeve, the pressure head guide holder, the pressure head post, the one side at the base is installed to the pressure head guide holder, fixing bolt passes the sleeve and installs the opposite side at the base to the pressure balance board, the pressure head post is the cylinder at the convex pressure angle in a tip area, it has the slotted hole toopen on the pressure head guide holder, the pressure head post slides in the slotted hole of pressure head guide holder, the backing plate is arranged in on the base and is located the pulley class set of component's that is tested below, the central position of being tested with the quilt on the pressure balance board that corresponds of pulley class set of component is equipped with the pulleyclass set of component that fastening bolt fixed connection was tested. The utility model has the advantages of assurance test's stationarity and security reduce the damage to test device.

Efficiency of the High Contact Ratio Involute Spur Gears With Asymmetric Teeth

Abstract: Gears with asymmetric teeth have unique potential for application in gearboxes, particularly when uni-directional loading is applied. Most recently, gears with asymmetric teeth have received much attention for use in applications that require high performance due to increased load capacity. Such applications include aircraft and wind turbine. These gears offer flexibility to designers due to their non-standard design. In asymmetric teeth, the geometry of the drive side is not to be symmetric to the coast side. In other words, the pressure angle on the drive side is greater or smaller than that on the coast side. Asymmetry between tooth sides provide vital in obtaining key properties, such as high load carrying capacity, low weight, low wear or low vibration. In order to effectively design asymmetric teeth, it is necessary to perform analyses on the efficiency of these gears under various loading. In this study, the results obtained on high contact ratio involute spur gears with asymmetric teeth are presented and discussed. The impact of a few design parameters, such as pressure angle or tooth height, on sliding velocities and friction is investigated and illustrated with numerical examples.Copyright © 2010 by ASME

Numerical control grinding method for titanium alloy material of circular arc end tooth structure

Abstract: The invention relates to a numerical control grinding method for titanium alloy material of a circular arc end tooth structure. Before processing, the following information of a machining tool are determined: a horizontal position of a part; a radial position, an axial position and an angle of a sand wheel dresser; a pressure angle; size parameters of a sand wheel; size parameters of a diamond disc sheet; shape parameters of end teeth; and adjustment of a cooling pipeline. The procedure processing comprises the following operations of: clamping the part; scoring tooth traces on the end surface of the part by the sand wheel to check the relative positions of the teeth and holes; cutting the teeth by small cutting amount, not dressing the sand wheel, and applying color to observe and determine the number of teeth at one interval when the sand wheel is dressed; roughly cutting the teeth, and dressing the sand wheel at the interval of several teeth; applying color to check, adjusting the radius and the center distance of the sand wheel, and verifying the shape parameters of the teeth; cutting the teeth in a semifinishing way, with the dressing frequency of the sand wheel being half of the finishing frequency; and applying color to check, adjusting the grinding parameters, and ensuring the contact area of the teeth and the sand wheel. The method has the advantages that the processing of the titanium alloy material of the circular arc end tooth structure is realized, the numerical control is realized in the grinding of the circular arc end teeth, and the processing capability of the end tooth structure of aviation industry is improved.

Inner gearing incomplete gear mechanism

Abstract: The utility model discloses an inner gearing incomplete gear mechanism contains driven gear, drive gear, and driven gear is the ring form, a plurality of internal tooths of inner wall equipartition inhole, and drive gear establishes the gear mass, establishes the connecting hole in the gear mass, and the driving cog is established to the outer circumference of gear mass, the utility model discloses the driving cog is the same with the pressure angle of internal tooth, the driving cog size is less than the internal tooth, driving cog and driven gear's a second internal tooth inner gearing after the rotatory a week of drive gear, driving cog and driven gear's a third internal tooth inner gearing after the rotatory a week of drive gear continuation, the circulation intermittent driving who goes round and begins again, be fit for replacing the feeding connecting rod mechanism on the rice cake class food preparing appliance, it is big also to have solved feeding connecting rod mechanism frictional force, easy card pauses, the clearance is big, the problem that pay -off stroke error is big, also greatly reduced cost of maintenance.

Modeling and Simulation of Vibrations of a Tractor Gearbox

Abstract: The vibration characteristics of a four-stage reduction tractor gearbox were studied.These characteristics are: displacement amplitudes, natural frequencies and mode shapes. The main aim of the study was to obtain accurate dynamic response of the system to time varying gear mesh stiffness and periodic frictional torque on the gear teeth and to analyze the effect of gear design parameters on the dynamic response in order to obtain the optimum configuration for the multistage gear train.A mathematical model for torsional vibrations incorporating the periodic frictional torque on the gear teeth, the time varying mesh stiffness and time varying damping coefficients as the main sources of excitation was developed. Mesh coupling between the four reduction stages of the gear train and shaft flexibility were taken into consideration.A computer program in FORTRAN that employs fourth order Runge-Kutta integration scheme was developed to simulate the model in the time domain. One of the challenges with models of multiple gear pairs encountered was predicting the initial conditions for the numerical integration. In this research, an iteration scheme was employed where the response after one period of each gear mesh was taken as the initial value for the next iteration until the difference between the initial values and the values after one mesh period was relatively small. This state corresponds to the steady state rotation of the gears. The model was verified by comparing the numerical results obtained with experimental data from NASA Lewis Research Center. The results were found to correlate very well both in the shape of the curves and in magnitude thus indicating that the model represents the physical behavior of gears in mesh. The numerical results obtained showed that gears exhibit large vibration amplitudes which influence the forces and stresses on the gear teeth under dynamic load conditions. It was observed that the dynamicload on the gear teeth is much larger than the corresponding static load and as a result, the stresses, and hence, bending and contact fatigue lives of the gear set are influenced by its vibratory behavior.The effect of varying gear design parameters (module, pressure angle and contact ratio) was also studied. The results obtained showed that increasing the contact ratio of a pair of gears in mesh reduces the vibration levels significantly. The results showed that by using gears with a contact ratio of 2.0, the vibration levels can be reduced by upto 75% while the peak dynamic stress on the gear teeth can be reduced by upto 45%. Gear pairs with a module of 2.5 and contact ratio close to 2.0 were found to yield the best combination of low vibrations and low bending stresses for the gearbox studied.The eigenvalues and eigenvectors of the system were obtained using the Householder and QL algorithm. Prediction of the natural frequencies and mode shapes provided important information for keeping the natural frequencies above the operating speed range. For the gearbox system analyzed in this study, the natural frequencies predicted by the model were found to be way above the operating speed range and thus pose no danger of resonance occurring within the operating speed range. Results from this study showed that, by reducing the mass moment of inertia by about 20%, the natural frequency increases by about 11%.The model developed in the study can thus be used as an efficient design tool to arrive at an optimal configuration for the gearing system that will result in minimum vibration levels and low dynamic gear root stresses in a cost effective manner.