Free Standards Download

This paper deals with the design of helical gears that have minimum transmission error and, at the same time, are less sensitive to manufacturing errors. The paper addresses two stages in design: 1) Design generation stage where...

Test results with a high speed four square gear test rig (nmax* =26 000 rpm) show the influence of speed, viscosity, base oil, type and amount of additive on the scuffing load. In some cases at high...

The ART program is structured in two phases. The first phase involves four contracts and is considered the preliminary design and component validation phase.This phase allows each contractor to develop advanced design concepts which incorporate key advanced...

Rapid and destructive failures of high quality, high speed, lightweight and highly loaded aircraft gears are indication of the vibrational energy (associated with neutral frequency modes) exceeding the fatigue endurance limit of advance gear materials. This paper...

Polishing wear has been known to occur on piston rings， cylinder bores, valve lifters， hydraulic components, rolling- -element bearings and gear teeth. The bright, polish surfaces may look good, but polishing wear is detrimental because it is...

In the first part, this document describes all the types and aspects of wear which can occur on the gear teeth in operation, with causes and explanations concerning their appearance. For each type of wear, the possible...

Worm-gear drives have been subject of intensive research. Geometry of worm-gear dr ives with ground worm surf aces and worm surfaces generated by blades have been. developed by (Litvin, 1968). (Winter et al, 1981) and (Octrue,1988) have...

If the different rating methods usually used for designing worm gears (, a ) consider their limited life because of TEETH BREA-KAGE and CONTACT PRESSURES, experience shows that in most cases, it is the SURFACE DEGRADATIONS OF...

This paper is concerned primarily with the development of a gear noise test facility which is currently being used to study the fundamental sources of gear noise excitation through the testing of carefully controlled pairs of gears....

While eddy current technology has long been used in the testing of bar, tube, and wire stock, advances in electronics, automation, and coil design have paved the way for a new generation of testers specifically designed for...