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Worm Gears Scuffing Load Capacity

Worm gear drives realize tall equip proportions in one organize and so are a compact way for a considerable speed decrease and torque increment. The worm is regularly made of casehardened steel, while the worm wheel is ordinarily made of a generally delicate fabric, such as bronze. To permit the utilize of littler and lighter drives with at the same time less wear, the request for worm wheels made of harder materials with more noteworthy quality. Worm adapt drives with worm wheels made of harder materials are as of now in utilize for the most part moo- speed applications, such as lifting gadgets or sun oriented trackers for photovoltaic plants. Other than wear and setting as common disappointment modes of worm gears, these fabric combinations are too inclined to the disappointment mode scraping at higher speeds. As scraping harm can lead to quick loss-of-drive of the gearbox, the responsible plan of worm gears of such materials requires a solid calculation strategy to decide the scraping stack capacity. As such a strategy is as of now not accessible, the utilize of harder materials for worm wheels isn't common for applications with higher speeds.


The advancement of a scuffing stack capacity calculation strategy for worm gears. Two fundamental prerequisites on the strategy are characterized. First, the strategy has to consider the particular conditions of worm gears in respects to their contact conditions. Moment, the strategy ought to utilize input parameters, such as sliding velocity or cruel Hertzian contact push, that are as of now utilized and given inside current plan hones, such as the worm gears measures ISO/TS 14521 or Clamor 3996. This permits for a practice-oriented application of the strategy inside stateof-the-art plan forms of worm gears.


To achieve the objective, this paper presents a brief diagram of the writing. Based thereof, it at that point portrays a reasonable approach and arrangement way to create a scraping stack capacity calculation. The taking after primary portion depicts the strategy itself and its establishment. Some time recently the conclusion, the paper examines the strategy and the potential for assist inquire about.

Scuffing of gears is understood to be the instantaneous welding of flank surfaces under the influence of the pressure and temperature conditions in the tooth contact. Due to the motion of the gears, the welded areas are teared apart and local damages with material transfer occur. Typically, on- going load cycles further damage the flanks and lead to an accelerated failure of the gearbox as well as higher power losses and poorer dynamics. Fig. 1 displays typical scuffing marks on the flanks of a spur gear, a hypoid gear and a worm gear. The origin of scuffing damages is consid- ered to be a metal-to-metal contact due to the absence of protecting layers. These protecting layers are typically formed by the lubricant and its additives. Accordingly, and in contrast to fatigue damages, a single momentary overload can cause scuffing.


To determine the scuffing load capacity of spur, helical, bevel and hypoid gears, current design standards, such as ISO/TS 6336-20 and -21 and ISO/TS 10300-20 , make use of contact temperature criteria. The calculation procedures of the standards include formulas for the con- tact temperature under consideration of the load conditions. To determine the scuffing safety factor, the thus calculated contact temperature of the considered gear box is then the divider for the scuffing temperature. The scuffing temperature is a characteristic parameter of a materiallubricant- system of a gear pair and is determined by gear tests. Generally, the approach of these standards to compare the con- tact temperature with a permissible temperature to rate the scuffing risk is a common practice.

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