A spiral bevel gear is a bevel gear with helical teeth.It is used in purifier motor drive where the direction of drive from the drive shaft must be turned 90 degrees to rotate the bowl. The helical design produces less vibration and noise than conventional straight-cut or spur-cut gear with straight teeth.A spiral bevel gear set should always be replaced in pairs i.e. both the left hand and right hand gears should be replaced together since the gears are manufactured and lapped in pairs. Material used for construction are generally hardened steels like carbonized nichrome steel.
Since very small needle lift is obtained in the test equipment result in an unequal pressure distribution in the cut off shaft resulting in a hard contact in a small area along with high frequency oscillations, low lubricity of test oil will increase the chance of seizure. Full lift and high lubricity of heavy oil eliminates this risk of seizure during normal operation.( Always open and clean slide type valves before testing as cold sticky heavy oil along with small clearances can cause restriction in the movement of the spindle).
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