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.

Eccentric swing gear transmission

Abstract: A transmission which comprises eccentric swing gears composed of a speed change internal gear and a speed change external gear each having a pressure angle of a tooth form within 30° to 45° and an addendum h satisfying the relation of m/2>h>0 (m=module), the speed change external gear engaging with the speed change internal gear therein, and coupling gears composed of a coupling internal gear having a trapezoidal or a substantially trapezoidal tooth form and a coupling external gear similarly having a trapezoidal or a substantially trapezoidal tooth form and having the same number of teeth as the coupling internal gear, the coupling external gear engaging with the coupling internal gear therein, the tooth forms of the coupling internal and external gears being molded so that the following relation may be satisfied between θ 1 and θ 2 : θ.sub.2 =(360°/Z×1/2)+θ.sub.1 wherein Z represents the teeth number of the coupling internal gear and the coupling external gear, and θ 1 and θ 2 represent pressure angles of the coupling external gear and the coupling internal gear, respectively, the eccentric swing gears being connected to the coupling gears.

The Influence of Gear Design Parameters on Gear Tooth Damage Detection Sensitivity

Abstract: This paper develops an analytical model to simulate the gear mesh contact for a spur gear pair with and without tooth damage. Three common gear tooth faults are simulated including pitting, wear and root cracks. The effect of tooth face width on detection sensitivity for pitting and the effect of crack width on detection sensitivity for crack are investigated. Using static performance measures, such as transmission error results suggest that basic gear design parameters, such as diametral pitch, pressure angle and number of teeth, may have a significant effect on damage detection sensitivity. It appears that a decrease in diametral pitch will enhance damage detection sensitivity for all the three types of damage. An increase in pressure angle or number of teeth will enhance detection sensitivity for pitting damage, but tends to decrease the sensitivity to crack or wear damage.

A Balanced Maximum Fillet Stresses on Normal Contact Ratio Spur Gears to Improve the Load Carrying Capacity Through Nonstandard Gears

Abstract: This article presents an idea to remove the inequality in maximum fillet stresses developed between pinion and gear of a step up gear drive. This uniform fillet strength of the gear drive can be achieved by using nonstandard pinion and gear with appropriate addendum modifications generated by nonstandard basic racks of respective tooth thickness not equal to 0.5πm at the pitch circle. The influence of gear parameters such as gear ratio, pressure angle, addendum factor, pinion teeth number, and addendum modifications on the maximum fillet stress on the nonstandard pinion and gears of different tooth thickness has been analyzed through finite element method and finally the optimum value of rack tooth thickness coefficients (k pc and k gc ) are suggested for the given gear drive (defined by i) that improves the fillet capacity in bending. This study has been extended for various drives like S std , S o , S +, and S − drives.

Wildhaber-Novikov Circular Arc Gears: Some Properties of Relevance to Their Design

Abstract: This paper follows an earlier one by Dyson et al. (Proc. R. Soc. Lond . A 403, 313 (1986)) in which a rigorous basic theory of the geometry and kinematics of Wildhaber–Novikov circular arc gears was developed. It was then applied to a pair of helicopter rotor final drive gears, operating in the conditions for which they were designed. The present paper extends this treatment by considering the effect of some variations on the same basic design, and of operating in conditions different from those for which the gears were designed. Aspects considered include the sensitivity of the pressure angle to changes in centres distance, the compromise between this sensitivity and reduction in contact stress, the relation between pressure angle and centres distance over the entire range theoretically possible, the avoidance of interference, the extent of the contact area in terms of position on the teeth, backlash and internal gears.

Experimental Investigation on the Influence of Internal Surface Roughness of Organ Pipe Nozzle on the Characteristics of High Pressure Jet

Abstract: The organ-pipe nozzle is widely used because of its generation of self-resonating cavitating jets which combines the advantages of cavitating jets and pulsed jets. In order to improve the working efficiency of organ-pipe nozzle by studying the influence of internal surface roughness on the characteristics of high pressure jet under high Reynolds numbers, the relations between turbulent boundary layer and surface roughness are theoretically analyzed, and the laws of the axial pressure fluctuation and the diffusion angle of the jet are investigated by experiment. The results show that, the peak pressure, the rage of pressure fluctuation and the diffusion angle are influenced more greatly by the surface roughness when the inlet pressure is greater. There exists a minimum roughness number, above which the diffusion angle starts to increase while the peak pressure and the rage of pressure fluctuation starts to decrease greatly. For a certain inlet pressure, there exists a critical roughness number, below which the axial pressure fluctuation increases at first and then decreases with the increase of stand-off distance, while above which the axis pressure fluctuation only decreases when the stand-off distance increases. Based on the experimental data, a preliminary mathematical model of the axial peak pressure relating to inlet pressure, internal surface roughness and stand-off distance was established by utilizing the principle of conservation of energy.