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Principal external dimensions of worm gear units of 4 in, 6 in, 8 in, 10 in, 12 in, 14 in, 17 in and 20 in centre distances, employing worm gearing complying with BS 721.
This Japanese Industrial Standard specifies the general-use cylindrical worm gears with an axial module of 1 mm to 25 mm and a centre distance of 40 mm to 500 mm used for power transmission.
This paper shows several synthetic gear oils and their influence on wear and efficiency of highly loaded worm gears. The results are based on measurements carried out on the Kluber worm gear test rig. This test rig allows the measurement of input speed, input...
The friction conditions in the mesh of worm gear drives have big influence on the efficiency of worm gears. Because the friction conditions of worm gears can't be determined directly, a special test rig (three disk test rig) was built to simulate the...
ISO/TR 10828:2015, thread profiles of the five most common types of worms at the date of publication are described and formulae of their axial profiles are given. The five worm types covered in this technical report are designated by the letters A, C, I, K and N. The formulae to...
In this Technical Report, thread profiles of the five most common types of worms at the date of publication are described and formulae of their axial profiles are given. The five worm types covered in this technical report are designated by the letters A, C, I, K and N. The formulae...
Worm gear contact stresses are the major contributor to worm gear wear and durability failures. In this paper, a combination of loaded tests, coordinate measurements, surface reverse engineering and a special finite element method is employed to study the effect of...
A comprehensive model for the measurement, inspection, performance prediction and reverse engineering of ZK type of worm gearing is developed. The measurements and the best fit processes both for the worm thread and for the gear tooth flank are discussed in detail. A CMM...
Proposes a method for determining surface deviations of the wormgear tooth that result from cutting edge deviations of the hob used to cut the gear. Demonstrates how to obtain tolerance tables for wormgear tooth profiles from the tolerance tables for the corresponding worm threads and...
This paper analyzes the influence of different parameters in CD ISO 14561 Load Capacity Calculation of Worm Gears such as; efficiency, wear load capacity, pitting, deflection and tooth root stress. The influencing parameters are divided into different categories such as external...
Presents the methodology used for testing materials with a worm gear set-up and with a disc-roller machine. Discusses and analyzes several experimental results. Draws a correlation between metallurgical analyses of the structure of bronzes and experimental observations of subsurface...
This document specifies formulae for calculating the load capacity of cylindrical worm gears and covers load ratings associated with wear, pitting, worm deflection, tooth breakage and temperature. Scuffing and other failure modes are not covered by this document. The load...
This document specifies formulae for calculating the load capacity of cylindrical worm gears and covers load ratings associated with wear, pitting, worm deflection, tooth breakage and temperature. Scuffing and other failure modes are not covered by this document. The load...
Cylindrical involute helicoid worms with a normal pressure angle of 20° in a range of axial modules from 0.052 in to 1 in. Design, formulae for calculating worm and wormwheel dimensions; four gear classes, with tolerances for pitch, profile and worm thread thickness, and...
Develops an equation for worms that can be used to ensure that there is no undercutting. Explains that for wormgears, the possibility of undercutting depends on many variables, and no simple criterion has been found. Describes procedures for checking for undercutting and other potential...
This paper studies the effect of machining parameters on the performance of worm gears using a special purpose finite element technique. Algorithms are presented to determine the worm and gear geometries by simulating the grinding action of the grinding wheel and cutting...
The authors have developed a computerized method for simulation of meshing and bearing contact (TCA) for single-enveloping worm-gear drives. The developed computer programs enable to determine the transmission errors and the shift of bearing contact that are caused by worm and...
