Gear Universiti Teknologi Malaysia（齿轮马来西亚各种大学）.pdf

1 Power transmission Components used to transmit power: gears, belt, clutch and brakes. Gear Objective: Student must be able to force analysis, stress analysis using basic formula (Lewis) and AGMA (bending stress and surface stress) Type of gear: Spur gear only Types of Gear a) Spur Gear  Teeth is parallel to axis of rotation  Can transmit power from one shaft to another parallel shaft b) Helical gear  Teeth is inclined to the axis of rotation  Smoother than spur  Develop thrust load (helix angle)  Can transmit power from one shaft to a parallel and non-parallel shaft 2 c) Bevel gear  Teeth on conical surfaces  Transmit power between two intersecting shafts d) Worm gear  Transmit power between two intersecting shafts Terminologies A pair of gears can represented as 2 circles d1 = Nm d2 = Nm 2 3 where: N : number of teeth m : module note: mating gear must have same m 3 Module: is the ratio if diametral pitch and number of teeth m = d/N [mm] Face Widt