High-speed bevel gear transmission system

A high-speed bevel gear transmission system for transmitting a power between input and output shafts the axes of which intersect each other, which comprises an input shaft mounted on axially slidable bearings;

• a pair of driving bevel gears which are fixedly mounted on said input shaft such that said bevel gears face in opposite directions, teeth of the bevel gears being the same in number and size and spirally arranged in the opposite directions to each other;
• a pair of driven bevel gears engaged with said driving bevel gears, respectively;
• a pair of output shafts on which said driven bevel gears are fixedly mounted, respectively;
• and angular contact ball bearings for supporting said output shafts, the speed transmission ratio of the output shafts to the input shaft being between 1.45:1 to 0.476:1, the ratio R of a thrust load in the axial direction of said driven gears to a tangential load of said driven gears from a pressure angle .alpha. and a helix angle .beta. of said driving bevel gears and said driven bevel gears, and a pitch cone angle .delta. of said driven bevel gears being defined by the formula, R=[(tan.alpha..multidot.sin.delta.)/cos.beta.]-tan.beta..multidot.cos.delt a. being from -0.324 to 0.1.