Internal involute gear curve

[jperkins]

Does anyone know of a reference which can give me the method to generate an involute curve for an internal spur gear? Thanks.



jperkins

 

[jbuckl]

Create an equation curve.

Use the following:-

rb=(pitch/2)*cos(p_a)

x=rb*(cos(t*180/pi)+t*sin(t*180/pi))

y=rb*(sin(t*180/pi)-t*cos(t*180/pi))

z=0



First line brackets can be parameterised or type your required pitch radius then pressure angle.

IE rb= 30*cos25.

This technique was first suggested by Frank de Simone (PTC)



A video can be found on the PTC Website:

http://www.ptc.com/appserver/it/icm...lay/replay_v.jsp?im_dbkey=10028&icg_dbkey=362



Post back if you have more questions on gears