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Unformatted text preview: 103 Chapter 8 Bevel Gears 8.1 A pair of straighttooth bevel gears is to be manufactured for a shaft angle of 90. If the driver is to have 18 teeth and the velocity ratio is to be 3:1, what are the pitch angles? 2 18 teeth N = , ( 29 3 2 3 2 2 3 54 teeth N N N = = = , ( 29 1 2 2 3 tan 18.43 N N  = = , 3 2 90 71.57 =  = Ans. 8.2 A pair of straighttooth bevel gears has a velocity ratio of 1.5 and a shaft angle of 75. What are the pitch angles? ( 29 1 2 2 3 sin tan 28.78 cos  = = + , 3 2 75 46.22 =  = Ans. 8.3 A pair of straighttooth bevel gears is to be mounted at a shaft angle of 120. The pinion and gear are to have 15 teeth and 33 teeth, respectively. What are the pitch angles? ( 29 1 2 3 2 sin tan 27.00 cos N N  = = + , 3 2 120 93.00 =  = Ans. 8.4 A pair of straighttooth bevel gears with diametral pitch of 2 teeth/in have 19 teeth and 28 teeth, respectively. 28 teeth, respectively....
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 Spring '11
 Jung

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