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<正>Helical gears have many advantages in practical usage and are nowadays indispensable as an element of automobile transmission.Recently helical gears have been used not just for automobiles but also various other purposes.With the proliferation of applications,it is important to study the load carrying characteristics of helical gears.In this paper we used test gears with different tooth forms. Friction loss of helical gears was also investigated using various tooth forms.The test results were compared with those for spur gears.Finally,this paper shows the new relationship of friction losses in helical gears and in spur gears,as in cylindrical gears.