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.

Comparison of Height Method and Pressure Method for Measurement of Powder Contact Angle

Abstract: The measurement of powder contact angle offers an essential significance both in terms of theory and practice.According to the Washburn equation,and based on the measurement of powder contact angle using osmoses method,the concept of relative contact angle,and the testing apparatus for measurement of relative contact angle of graphite powder is designed.Using benzene as the reference liquid,the relative contact angle of graphite powder over distilled water at 25 ℃ is measured using the height method and pressure method,which is 83.50 ℃ and 83.74 ℃ respectively.The test results show that both the height method and pressure method can be used for measurement of powder contact angle.

Internal gear of planetary gear device

Abstract: PURPOSE:To prevent the stress cracking of a gear by providing a tooth form having bottom parts indented with a radius of at least 05 R CONSTITUTION:An internal gear 10 is constructed with bottoms between teeth, indented with a full radius of at least 05 R The action of this gear 10 is to disperse the driving stress in the radius form of 05 R without having said driving stress concentrated in a specific position of a bottom part 14 even if said driving stress is applied to a tooth form 12 by allowing planetary gears to engage with the internal gear Further, even if repetitive stress is applied to the bottom part 14 due to the engagement of the internal gear with the planetary gear, durable time until a stress crack occurs is greatly prolonged Moreover, even if a pressure angle is taken large to obtain a bottom size to raise the rigidity of the tooth form 12, the durability of the internal gear can be greatly improved

Investigating the effect of helix angle and pressure angle on bending stress in helical gear under dynamic state

Abstract: Purpose The aim of this paper is to study the effect of pressure angle and helix angle on bending stress at the root of helical gear tooth under dynamic state. Gear design is a highly complex process. The consistent demand to build low-cost, quieter and efficient machinery has resulted in a gradual change in gear design. Gear parameters such as pressure angle, helix angle, etc. affect the load-carrying capacity of gear teeth. Adequate load-carrying capacity of a gear is a prime requirement. The failure at the critical section because of bending stress is an unavoidable phenomenon. Besides this fact, the extent of these failures can be reduced by a proper gear design. The stresses produced under dynamic loading conditions in machine member differ considerably from those produced under static loading. Design/methodology/approach The present work is intended to study the effect of pressure angle and helix angle on the bending stress at the root of helical gear tooth under dynamic state. The photostress method has been used as experimental methods. Theoretical analysis was carried out by velocity factor method and Spott’s equation. LS DYNA has been used for finite element (FE) analysis. Findings The results show that experimental method gives a bending stress value that is closer to the true value, and bending stress varies with pressure angle and helix angle. The photostress technique gives clear knowledge of stress pattern at root of tooth. Originality/value The outcomes of this work help the designer use optimum weight-to-torque ratio of gear; this is ultimately going to reduce the total bulk of the gear box.

Analysis and Experiment on the Impact of Various Hook Angle Factors on Spindle Picking Performance

Abstract: As the core component of the cotton picker, the structural characteristics of the spindle directly affect not only its picking performance but also different components of the cotton picker. Therefore, in order to reveal the influence of different angle parameters of hook teeth on the performance of the spindle and the optimal hook tooth angle parameters, this study analyzes the working principle of the picking mechanism of the cotton picker and establishes the force balance equation for the process of picking cotton from the spindle. By analyzing the structural characteristics of the spindle, the best section shape of the spindle head is the equilateral triangle section. The spindle with different angle parameters was made by a metal 3D printer, and the testbed for the dynamic picking performance of the spindle was constructed. The single-factor test was carried out with tooth groove angle before the tooth angle and tooth inclination angle as experimental factors, and the rejection rate of seed cotton, picking time, and picking force as evaluation indexes. The results showed that the tooth groove angle and the tooth inclination angle were negatively correlated with the rejection rate of seed cotton (P < 0.01), and the tooth inclination angle was positively correlated with the picking time (p < 0.01). Further analysis shows that in order to reduce the ejection rate of seed cotton and reduce the picking time, the selection range of the tooth inclination angle should be 55~65°, and the large the tooth groove angle should be selected. Finally, the optimum hook angle parameters are determined as follows: tooth groove angle is 70° before the tooth angle is 89°, and the tooth inclination angle is 65°. The results are of practical significance to optimize the structure of picking hook tooth to improve the picking performance of the spindle and high efficiency of the cotton picker.

Finite Element Analysis for Bending Stress of Face-Gear

Abstract: The top edge of the shaper tooth is rounded to improve the bending strength of face gears, and then the fillet surface equation of face gear is presented. After the Tooth Contact Analysis (TCA), the variation of bending stresses is computed during the cycle of meshing and when some parameters are changed based on the 3-Dimension contact finite element method. Results indicate that both of the nominal pressure angle and shaft adjustments of face-gear obviously affect the bending strength.