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Lecture_19

# Lecture_19 - Kinematics and Dynamics of Machines ENGR 3270U...

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Kinematics and Dynamics of Machines ENGR 3270U Lecture 19 Yuping He University of Ontario Institute of Technology November 24, 2008

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1.1 Procedure for Selecting Standard Gears Standard gears are interchangeable and any two standard gears can be meshed together. The following conditions are required: a. The pressure angles must be the same ; b. The diametral pitches must be the same ; c. The dedendum on a given gear must be greater than the addendum on the mating gear ; d. The tooth thicknesses must be equal to one-half the circular pitch. b a t 1) Choose pressure angles. o 20 o 25 commonly used o 2 1 14 now little used
1.2 2) Define a tooth size parameter (i) diametral pitch ( ) for US IPS units d P ) / 1 ( in d N P p d N d p p c / where (ii) module (m) for metric units 2, 2.5, 3, 3.5, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 36, 40, 42, 48, 50, 64, 72, 80, 96, 120 Commonly used diametral pitch values are listed: ) ( mm N d m p where d P m / 1 1, 1.25, 1.50, 1.75, 2, 2.25, 2.50, 2.75, 3, 5, 6, 8, 10, 12, 16, 20 Commonly used module values are listed:

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1.3 3) Determine values for a, b and t b a t For designs with US IPS units (a) o 20 (i) 99 . 19 ~ 1 d P d P a / 000 . 1 d P b / 250 . 1 d P t / 5708 . 1 (ii) 200 ~ 20 d P
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Lecture_19 - Kinematics and Dynamics of Machines ENGR 3270U...

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