Providing of lateral clearance in tooth gears by additional displacement of the original contour

A method of multicriteria optimization of gearing with the use of the Kompas-3D program for calculating the degrees of correction of the lateral clearance in the tooth gear is proposed. The recommendations (GOST 16532—70, Appendix 2) on the selection of the degrees of correction of the gear wheels of cylindrical gears are analyzed, the necessary corrections are proposed. Keywords: tooth gear, lateral clearance, degree of correction, multicriteria optimization method, Kompas-3D program, blocking contournhanthong [email protected]

Estimation of the tooth gear service life by wear under misalignment conditions

A method of approximate estimation of the life of a tooth gear by the wear of the teeth of gear wheels in the presence of a misalignment is proposed. The dependences of the of the tooth gear life on loading, formulas for determining the maximum wear and contact pressure are obtained. Keywords tooth gear, wear, life, engagement, misalignment, wear resistance. [email protected]

Design and Performance of a Curvilinear Circular-Arc Tooth Gear for Gear Pump Applications

The most common gear architecture used in external gear pumps is the spur gear with an involute tooth profile. The involute spur gear has many benefits, such as a constant line of action, tolerance to parallel misalignment, and ease of fabrication. However, the involute spur gear has two major drawbacks in pump applications: the tooth profile results in trapped pockets of fluid that contribute to pressure spikes and noise generation, and the straight axial profile further increases noise due to intermittent tooth shock during meshing. Current state-of-the-art pumps utilize helical gears to enable a gradual mesh to reduce noise and pressure pulsation, which results in an axial load induced on the gears during meshing. A novel gear design has been developed that eliminates axial gear loading while preserving a gradual mesh. A hybrid tooth profile eliminates the trapped fluid pocket while maintaining the benefits of an involute profile. Initial testing demonstrates an increase in volumetric efficiency by 10% and a reduction of sound level by 7 dB compared to a spur gear of the same size.

Application of Tooth Gear Impact-Echo System for Repeated and Rapid Data Acquisition

Developments in air-coupled testing hardware in impact-echo (IE) tests have enabled new levels of scanning tests for concrete bridge decks. A tooth gear IE system has been developed using tooth gears as impactors and microelectromechanical systems (MEMS). Since the tooth gear moves and generates impacts itself, this system collects a large amount of test data across the field continuously. The contact duration of two different tooth gears is evaluated and the contact mechanism is compared to a conventional steel ball impactor by a high-speed camera. The data measurements were carried out on concrete slabs, where artificial delaminations were embedded at different depths. Based on our IE experiments, reducing the pitch or increasing the number of teeth was required to decrease the contact duration and generate the thickness mode frequency from deep delaminations. Rapidly obtained time domain data were transferred to the frequency-time domain using spectrograms to identify the dominant frequency band of the signal set. The results show that the developed system enabled us to acquire high-quality data during air-coupled IE tests and spectrogram analysis provided meaningful frequency information and verified its repeatability.