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.

Design and Analysis of Internal Gears With Different Rim Thickness and Shapes

Abstract: In recent years, thanks to their significant advantages such as compactness, large torque-to-weight ratio, large transmission ratios, reduced noise and vibrations, internal gears have been used in automotive and aerospace applications especially in planetary gear drives. Although internal gears have a number of advantages, they have not been studied sufficiently. Internal gears are manufactured by pinion type cutters which are nearly identical with pinion gear except the addendum factor which is 1.25 instead of 1. The tip geometry of a pinion type cutter which determines the fillet of internal gear tooth can be sharp or rounded. In this study, the design of internal gears were investigated by using a traditional approach. Mathematical equations of pinion type cutter were obtained by using differential geometry, then the equations of internal gear tooth were derived accurately by using coordinate transformations and relative motion between the pinion type cutter and internal gear blank. A computer program was generated to attain points of internal gear teeth and three dimensional design of complete gear. 20°-20° were used as pressure angle. To find optimum internal gear geometry, different rim thicknesses and shapes are tried out for finite element analyses. There were several parameters that were shown to effect the performance of the internal gears, with tooth stiffness being the most significant parameter. Tooth stiffness was also vitally influence the dynamic analysis. In order to compute gear tooth stiffness of the internal gear with various rim thicknesses and shapes, finite element analysis was used. A static analysis was performed to assess the gear bending stress and tooth displacement. Tetrahedral element type was selected for meshing. The internal gear outer ring was fixed and the force of 2500 N was applied on the tooth. According to the displacement values from the analysis internal gear tooth stiffness were calculated individually. Additionally, the effect of root bending stress with varying rim thickness, shapes, and root radius were investigated. The bending stresses were calculated according to ISO 6336 and using finite element analysis were shown to be in good agreement. It was shown that when the rim thickness and fillet radius were increased, the maximum bending stresses decreased considerably. As rim thickness was increased, the maximum bending stress decreased nearly 23%. It was also shown that as the fillet radius decreased, the maximum bending stress increased, whereas the rim stresses slightly changed. As the fillet radius was decreased, the maximum bending stress increased nearly 10%. It was also observed that when rim thickness was increased, the stress on the rim was decreased, whereas tooth stiffness was increased. However, fillet radius had no visible effect both on rim stress and tooth stiffness. Furthermore, it was shown that the rim shape had significant effect on rim stress.Copyright © 2015 by ASME

Application of Spline Function in Solution for Pressure Angle of Oscillating-Roller-Followed Cam

Abstract: Due to uncompleted cam basic parameters or unknown motion functions of follower, it is difficulty to calculate pressure angle for cam mechanisms while only given some discrete points on actual cam profile. After the research of solution for pressure angle of the oscillating-roller-followed disk cam used in cold forging machine, the article brings foreword detailed solutions under such condition above based on cubic spline interpolation function.

Big-modulus internal spline gear shaping machining system and method

Abstract: The invention discloses a big-modulus internal spline gear shaping machining method. The method comprises the steps of conducting pre-machining on a workpiece to be machined through a first gear shaping tool with the pressure angle smaller than the target pressure angle of a target finished product, that is, cutting off one part of the workpiece to be machined first and then switching a second gear shaping tool with the pressure angle equal to the target pressure angle of the target finished product to conduct finish machining on the workpiece to be machined, wherein the cutting amount needingto be completed by the second gear shaping tool is reduced as the first gear shaping tool has cut off one part of the workpiece to be machined; correspondingly, the cutting force borne by the workpiece to be machined is small relatively, and the situation that vibration is generated and the machining precision is affected can be effectively avoided; the workpiece to be machined is subjected to machining twice, the cutting amount needing to be completed through one-time machining is divided into two, the contact area between the gear shaping tool and the workpiece to be machined is reduced, the cutting force is small, the machining precision is improved, and accordingly, the workpiece to be machined can meet the design requirements. The invention further discloses a big-modulus internal spline gear shaping machining system.

Induction Motor with Ratchet Device

Abstract: An induction motor has a gear connected to an output shaft of the motor, a ratchet wheel having a claw for preventing the reverse rotation of the gear, and an urging device. The urging device urges the ratchet wheel so that an end surface of a tip end of the claw of the ratchet wheel is brought into contact with a tooth face facing a reverse rotary direction of the gear so as to prevent the reverse rotation of the gear. A contact angle formed by the end surface of the tip end of the claw and a center line of the tooth of the end surface of gear preferably is set equal to a pressure angle of the gear.

Drive Shaft 마모에 영향을 미치는 설계 인자 검토

Abstract: Drive Shaft is one of signification automotive driving parts. It delivers power from engine to tire through transmission. Fundamentally it is required to maintain continuous rotational velocity without power loss or noise and needed to absorb vibration of vehicle body. Drive shafts also have enough strength and durability. To meet those requirements, Design factors like ball joint or cage size should be considered for vehicle development. The most important factors are Generated Torque rating (GT) Factor, Funnel Angle, Pressure Angle, Shaft Diameter, amount of grease, etc. But more importantly, Considering for abrasion was overlooked in design stage. In this study, design factors which affect joint abrasion are categorized in 4 items. It was studied which items were affected for abrasion in the most and the items were analyzed as design factors.