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.

Asymmetric tooth form type involute screw gear

Abstract: PURPOSE:To enable to enhance the face pressure strength of the titled gear by a method wherein a driving gear of the titled gear is provided with a small diameter while a driven gear is provided with a larger diameter, and the respective top lands are equal to those of symmetric tooth form. CONSTITUTION:In the driving gear 10 and the driven gear 20, the pressure angle of coast-side tooth surfaces 12, 22 of the symmetric tooth form indicated by solid lines is made to be smaller than the pressure angle of drive-side tooth surfaces 11, 21, whereby the asymmetric tooth form is obtained wherein normal-to-axis tooth thicknesses t'S1, tS2 are not changed while normal-to-axis top lands t01, t'02 are increased, as indicated by two-dotted lines. The increment of the normal-to-axis top land of the driving gear 10 is converted into a change of the thickness on the pitch circle of the gear 10, and the converted value is added to the tooth thickness of the driven gear 20. ACcordingly, the driven gear 20 having the normal-to-axis tooth thickness tS2, an outside diameter D02 and a normal-to-axis top land t02 as indicated by broken lines and the driving gear 10 of an outside diameter D01 meshed with the gear 20 are obtained.

Effect of pressure angle and back up ratio on asymmetric spur gear tooth bending stress

Abstract: Gearing is one of the most critical components in the mechanical power transmission system and in most industrial rotating machinery. It is possible that gears will be the most effective means of transmitting power in future machines due to their high degree of reliability and compactness. In 18th century saw an explosion in metal gearing. Gear design and manufacturing rapidly developed in the 19th century. Now a day, the gear design has become a highly complicated and comprehensive subject. An asymmetric spur gear tooth means that the two profiles (sides) of a gear tooth are functionally different for many gears. The workload on one profile is significantly higher and is applied for longer periods of time than for the opposite one. The design of the asymmetric tooth shape reflects this functional difference. The main objective of the present work is to estimate the stress across the critical section for different backup ratios and the results obtained. Developed programme is used to create a finite element model for asymmetric spur gear tooth to study the effect of bending stress at the critical section for different backup ratios. To study the effect of above parameter ANSYS was used. The rim thickness and the pressure angle was varied and the location and magnitude of the maximum bending stresses were reported and results obtained and compared.

Method of manufacturing tools used in producing gears by rolling

Abstract: PURPOSE:To provide a method of manufacturing tools used in producing greas by rolling, in which tooth form is corrected by detecting pressure angle to becorrected from the results of measurement of product gears, whereby toothform correction of gear rolling tools can be achieved by one or two correction of hob.

Method for improving preshaving hob

Abstract: The improving method of pre-shaving hob includes reducing the normal pressure angle of gear into small pressure angle of the hob, and altering the modulus and reference circle helical angle correspondingly, so as to make the base circle diameter, normal arced tooth thickness in the gear reference circle and the helical angle maintain unchanged after parameter altering. The altered parameters are regarded as parameters of the other gear and the hob is designed based on traditional method. The hob of the present invention may be used in machining gear part with relatively great displacement amount, and has ensured tooth shape trimming angle, simplified hob making process and raised machining precision.

Gear row power transmission characteristic analyzing device

Abstract: PROBLEM TO BE SOLVED: To obtain a gear arrangement with smaller axial force without trying by inputting diversified gear arrangement data by providing an axial force reduction calculation part for obtaining a gear arrangement where an axial force becomes smaller than a gear arrangement being inputted by a user, in a gear row power transmission characteristic-analyzing device. SOLUTION: By inputting gear position, size, pressure angle, load, axial diameter, and friction coefficient and by allowing a drive force/axial force/motor torque calculation part 41 to perform calculation, the results are stored at an axial force storage part 25, a drive force storage part 27, and a motor torque storage part 24. When an axial force reduction calculation method by changing the size is selected, an axial force reduction calculation part 43 by changing the size changes the size of the gear so that the axial force can be reduced while maintaining the contact with an adjacent gear without changing the position of the adjacent gear successively for each gear other than a fixed gear. Also, when the axial force reduction calculation method by changing the position is selected, a position change axial force reduction calculation part 44 obtains the direction of increase/decrease to see whether the relative position and the angle between gears should be increased as compared with the current status or not, thus determining the order of priority.