Abstract
In the area of universal gear reducers, standard does not prescribe relations between load capacity, gear ratios and axis heights. Therefore, larger load capacity of some gear reducers manufacturers has advantage for lower gear ratio and, vice versa, smaller load capacity of the gearbox achieves higher values of gear ratio. However, there are some manufacturers who produce gear reducers with smaller or larger load capacity for higher or lower gear ratio, within the same axis height. This paper deals with analysis of justification of applying two gear sets, especially in the case when so-called intermediate sizes of gear reducer are not used.
Highlights
Axis heights of universal gear reducers are prescribed according to the standard row R20
Since this row is very dense, for a while manufacturers of universal gear reducer produced reducers with axis height from a standard row R10
Soon they increased axis heights in order to increase gear ratio, and reducers are produced with axis height in a standard row R20/2
Summary
Axis heights of universal gear reducers are prescribed according to the standard row R20. In order to achieve some advantage at the market, smaller manufacturers of gear reducers produce reducers with smaller torque capacity, but with higher gear ratios. In this way they are able to provide cheaper lower stage gearbox in particular segment of gear ratios. Leading gearbox manufacturers recognized this occurrence, and started to offer two sets of gear pair within the same size, and even in the same of gearbox housing With this two gear sets, they provide particular gear ratio for larger and for smaller load capacity, so that they annulled advantage of smaller gear reducer manufacturers [2]
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