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.

New typed combination mechanism of linking rod and cam

Abstract: A kind of linking rod and cam combination mechanism, which could achieve a transmission of stable drive ratio, has been innovated. The transmission principle and calculation of drive ratio of this mechanism was analyzed. The mathematical equations of theoretical contour of cam and its tangent line and normal line were derived. Coordinates value of intersection point of common normal at each high paired contacting point were found by the use of analytical method, and the concept of pitch circle was presented. The expression of pressure angle of an arbitrary point on the theoretical contour of cam was established, and the moment relationship of driving and driven components was deduced. A kind of new typed linking rod and cam reducer was successfully developed based on this kind of mechanism.

A Study on the Elliptical Gear Design for Oval flowmeter

Abstract: Elliptical gear is used as a rotor of oval flowmeter. The elliptical gear can assist water flow-rate measurement by the space of the elliptical shape. Presently, elliptical gears have been processed using hob tool imported from Japan. But if it were not for the technical cooperation with Japan company, the Elliptical gears can't be processed. The purpose of this study is developing a domestic technology for elliptical gears and overcoming the dependence of foreign technical skills. It will bring the import substitution effect. In case of pressure angle , the elliptical gears have an interference of tooth. The increase of pressure angle makes the root of a tooth thick and the top of tooth thin. By results of this study, tooth of elliptical gear was designed and verified through the 2D and 3D simulation.

Meshing Characteristics of Profile Shifted Cylindrical Quasi-Involute Arc-Tooth-Trace Gears. Part 1. Theoretical Base

Abstract: Abstract A mathematical model of profile shifted quasi-involute arc-tooth-trace gears is obtained. The model includes functional relationships between the geometric-kinematic meshing characteristics and parameters of the generating surface as well as conditions which allow to prevent teeth undercutting and tip pointing. A short analysis of meshing characteristics value along the tooth trace is done for pressure angle value of 20º. This value of the angle was chosen as it is the most common one for general-duty gears, although the basic rack profile angle in the model is a variable quantity. The model can be used in the design and analysis of geometric-kinematic meshing characteristics of profile shifted quasi-involute arc-tooth-trace gears, cut by Gleason-type cutters with different profile angle value.

Investigation of a General Aviation Differential Pressure Angle of Attack Probe

Abstract: A wind tunnal calibration of a commerically available general aviation differential pressure angle of attack probe was conducted. Differential pressure varied linearly with pitch angle for each dynamic pressure tested. Beyond ±6 ◦ of yaw angle, differential pressure rolled off rapidly with yaw angle. Normalizing differential pressure with dynamic pressure collapsed the differential pressure to a single curve for pitch. Similarly, normalizing differential pressure with the dynamic pressure collapsed the differential pressure to a single curve for yaw. Normalizing the differential pressure with dynamic pressure removes the effect of speed and density altitude when deriving angle of attack from differential pressure. Normalizing the differential pressure using the pressure from the 45 ◦ probe surface similarly collapsed the differential pressure to single separate curves for both pitch and yaw. Differential pressure varied parabolically with pitch angle when normalized using the pressure from the 45 ◦ probe surface. For pitch angles above six degrees, a linear relation between differential pressure normalized with the pressure from the 45 ◦ probe surface and the square of the pitch angle provided an adequate approximation. The typical two-point linear approximation based on two in-flight calibration points results in significant errors in displayed angle of attack. Moving the low angle of attack in-flight calibration point closer to the stall angle of attack reduces the displayed angle of attack error in the critical stall region. Using a four-point linear approximation significantly reduces the error in displayed angle of attack throughout the angle of attack range. Combined pitch, yaw and roll results in sideslip, which produces significant error in displayed angle of attack based on calibration at zero yaw and roll.

Undercutting machining method for extra-large-pressure-angle transmission gear

Abstract: The invention belongs to a machining technology for a gear, and relates to an improved undercutting machining method for an extra-large-pressure-angle transmission gear. The undercutting machining method is characterized by including the following steps that rough gear hobbing is performed; a tooth root undercutting circle is machined. According to the improved undercutting machining method for the extra-large-pressure-angle transmission gear, designing, manufacturing and machining periods of a tool are greatly shortened, machining efficiency is improved, and the machining cost is lowered.