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.

Involute tooth profile internal gear pair out of pitch circle making large dedendum width and small relative curvature of tooth profile at engaging point without varying positive/negative of sliding rate during engagement

Abstract: PROBLEM TO BE SOLVED: To provide a tooth profile characterized in that (1) the positive/negative of sliding rates is not varied from the start of engagement to end thereof and (2) the tooth profile has large dedendum width of a pinion and further a small relative curvature of the tooth profile at an engaging point as compared with an internal gear pair in the conventional involute of the same module and the number of teeth concerning an involute internal gear pair.SOLUTION: A gear composing the internal gear pair employs as a tooth profile a part of a reference circle of a low pressure angle involute curve as asymptotic as possible to an involute curve drawn on the reference circle by points on straight lines rolling on the circumference of respective reference circles.

Effect of Coefficient of Asymmetry on Strength and Contact Ratio of Asymmetric Helical Gear

Abstract: A gear is a rotating machine part having cut teeth, which mesh with another toothed part in order to transmit torque. Gears may be spur, helical, bevel or worm in which Helical Gear is most common type of gear used in engineering applications. The increased in performance requirement such as high load carrying capacity, high speed, high reliability and long life leads to new design of gear. So as to fulfill above demand here we used a concept of asymmetric gear profile in which two different pressure angles are assign to two faces of gear tooth. In literature it shows that increased in drive side pressure angle shows improve in strength of spur gear. In this paper we find the effect of coefficient of asymmetry on strength and contact ratio of different helical gear pairs having gear ratio equal to one and transmit same power. All the gear pair are design in Cre-O parametric 2.0 and the analysis is carried out in ANSYS workbench 16.0. Results from numerical analysis shows that as coefficient of asymmetry and helix angle increases Von-Mises stress and total deformation decreases. To validate the results from numerical analysis experiment stress measurement is done using digital strain indicator in which a strain gauge (UFLA-1-350-23) is mounted at the root of the gear and strain is calculate for different loads. In further study we find the effect of coefficient of asymmetry on contact ratio of helical gear pairs, here it shows that decreased in coefficient of asymmetry leads to increased contact ratio.

캠의 형상과 밸브 변위선도에 대응하는 cvvl 종동절의 형상합성

Abstract: In this paper, we present continuously variable valve lift (CVVL) mechanism which has one cam and swing-arm. This mechanism is composed of continuously changing swing-arm and driving cam. For this mechanism, we propose the synthesis of swing-arm profile which is contacted with valve. For this process we use envelope theory as this synthesis procedure of swing-arm profile. Kinematic analysis of this mechanism has used radius of curvature and pressure angle. We use ADAMS to examine the validity of CVVL mechanism.

Hypoid gear device

Abstract: PROBLEM TO BE SOLVED: To provide a hypoid gear device having a number of engaging teeth which are twisted at a predetermined angle of torsion; and to increase a contact ratio without increasing an angle of torsion of the engaging teeth. SOLUTION: In a convex gear surface 16a of a ring gear 12, a pressure angle is sequentially increased from a small-diameter end side toward a large-diameter end side, and also in a concave gear surface 18b of a pinion 14 which contacts with the convex gear surface 16a, the pressure angle is sequentially increased from the small-diameter end side toward the large-diameter end side; thereby these contact ratios can be increased. In a concave gear surface 16b of the ring gear 12, the pressure angle is sequentially decreased from the small-diameter end side toward the large-diameter end side, and also in a convex gear surface 18a of the pinion 14 which contacts with the concave gear surface 16b, the pressure angle is sequentially decreased from the small-diameter end side toward the large-diameter end side; thereby these contact ratios can be increased. COPYRIGHT: (C)2011,JPO&INPIT

Double modification of a rack cutter using a variable pressure angle and modulus

Abstract: This study modifies the straight edge of the rack cutter into an arc shape by changing the pressure angle. Using a variable modulus, the tooth surface is longitudinally modified along the axial direction of the rack cutter to create a bulge in the rack teeth in the center of the tooth width. This rack cutter with a double-crowned tooth is used to generate a pinion. An unmodified rack cutter is used to generate a gear. An undercutting analysis of the rack cutter is used to determine the undercutting condition for the double-crowned rack cutter and to determine the limits for the parameter. The transmission error for a gear pair is calculating using a tooth contact analysis. For this study, the assembly error for six cases is used to calculate the transmission error for the gear pair and the contact points for the gear pair are placed on a gear tooth. These contact points used to determine the contact for the gear pair. A transmission error analysis of the gear pair for a double-crowned gear gives a parabolic curve for the transmission error. The distribution of the contact points shows that, regardless of assembly errors, the contact points for the gear teeth are along the center of the tooth surface, starting from the top of the tooth, and gradually moving to the flank and away from the heel. The results show that the values for the transmission error for the modified gear pair for the proposed modification of the variable pressure angle and the variable modulus on a traditional rack cutter are small and the transmission error of the assembly errors are almost similar to those for an ideal assembly.