Answer / deepak

pressure angle is an important parameter in gear design.
because of this pressure angle only power is transmitted.
ideal pressure angle is zero. sice no radial seperating
force will be acting for zero pressure angle. now a days we
use 20 degree presure angle

Answer / latha nagendran

*Pressure angle is the angle at which the driving gear
applies the normal force on the driven gear.The tangential
component of this normal force (Fncos(alpha))is what
contributes to the torque transmission and the radial
component(Fnsin(alpha)) only loads the shaft. Higher the
pressure angle lower the component that contributes to torque.
* Normally the driving member in a worm gear drive is the
worm. That is, it is used for speed reduction. The wheel
does not drive the worm. Motion is from worm to wheel.Hence
it is termed as self locking. It is a safety feature as in
cases of sudden power failure, the load being lifted will
not fall down as in the case of a hoist.However the wheel,
under certain conditions of lead angle,can drive the worm
worm gears become reversible.

Answer / vijayasankar

self locking means there is "no back drive" between worm
and worm wheel.It says we can transmit power from worm to
worm wheel only and vice versa is impossible.

Answer / anshu kumar

pressure angle is the angle between the line of action and
the tangent drawn to the pitch surface at the pitch
point.when the gears mesh each other,the power transmission
is only due to the contact force at the pitch point.if the
pressure angle is high then one component of this force will
act towards the bearings and thus bearing force increases
which result in wear.and the another component of this force
transmits the power.

Answer / totallamp

This is correction for Karthick's answer:

TAN of the lead angle should be less than the coefficient
of friction, then self-locking occurs

Answer / roma singh

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 .

Answer / karthick

the condition in which worm gear doesnot turn the worm is
called self-locking.it depends on the lead angle and
coefficient of friction between them.if the lead angle is
less than coefficient of friction then self-locking occurs

Answer / asma aslam

pressure angle in gear set is defined as the angle between
the line of action (common normal) and the line
perpendicular to the line of center.pressure angle rotated
in the direction of driven gear.
Significance:
increase of pressure angle
1-reduction in the danger of undercutting and interference
2-reduction of slipping speed
3-increase rigidity of toothing

Answer / sunil

Pressure angle is the angle between tangent of pitch line
normal to that pitch line. if pressure angle will be less
then failure of gear occurs.
Self locking means meshing of gear after same time of
interval that is contcat ration of each gear will be after
same time of period

Answer / vineet tiwari

SELF LOCKING
self locking is the phenomena of pressure angle and lead angle.
in worm gears during operation in reverse direction, the
pressure angle exceeds the lead angle and thus lock the gear
mechanism known as self locking

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