While details of space vehicles are not
publicized, it can be expected that gears may enter, even if only for small
instruments. These will no doubt be of a nature which will not require fluid
lubrication. However, Hartman^24 mentions that there may be a gear drive
between the turbine and the shaft on certain liquid rocket engines. Where
kerosene is the fuel used, this also provides lubrication for the gears.
However, kerosene alone allowed scoring of gears and consequently additives
were included. Use of 2 per cent by volume of zinc dialkyldithiophosphate
in the fuel, decreased gear wear. This combination also improved the rust
resistance of gears. Such a kerosene additive mixture is suggested as a break
in lubricant no matter what type of lubricant may be used in service. In this
connection, an article by Watson^51 entitled “Materials and Ratings for Dry
Running Gears” should be of interest. After experimenting
with various materials for gears, it was
found that under light loads, spur gears, made of
case hardened En steel, Phosphate prior to
coating the flanks with molybdenum disulfide, would
run continuously in a dry state without measurable wear.
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