Question { 46132 }

what is the significance of pressure angle in spur gear?
What is meant by self locking in worm and worm gear?

Answer

It is the angle at which the drive force is greatest i.e the point at which the maximum power can be transmitted by driver to driven gear. pressure angle must be an optimum value , lower the pressure angle leads to increase the stress concentration factor make gear of low strength e.g older gears(14.5). Now a days 20 pressure angle is used as it transmit large torque and power . it is generally use in aircrafts .