Advantages of Cycloidal gear teeth

 

1.  Since the cycloidal teeth have wider flanks, therefore the cycloidal gears are stronger than the involute gears, for the same pitch. Due to this reason, the cycloidal teeth are preferred especially for cast teeth.

 

2.  In cycloidal gears, the contact takes place between a convex flank and a concave surface, where as in involute gears the convex surfaces are in contact. This condition results in less wear in cycloidal gears as compared to involute gears. However the difference in wear is negligible

 

3.  In cycloidal gears, the interference does not occur at all. Though there are advantages of cycloidal gears but they are outweighed by the greater simplicity and flexibility of the involute gears.

 

S.No.

 

 

 

 

Involute tooth gears

 

 

 

Cycloid tooth gears

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.

 

 

 

The profile of involute gears is the

 

 

 

The profile of cycloidal gears is double

 

 

 

 

 

 

 

 

 

 

 

 

 

 

single curvature.

 

 

 

 

 

curvature

i.e.

epicycloid

and

 

 

 

 

 

 

 

 

 

 

 

 

 

hypocycloid.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.

 

 

 

The pressure angle from start of

 

 

 

The pressure angle varies from start of

 

 

 

 

 

 

 

 

 

 

 

 

 

 

engagement of teeth to the end of

 

 

 

engagement to end of engagement,

 

 

 

 

 

 

engagement   remains

constant,

 

 

 

which  results  into  less  smooth

 

 

 

 

 

 

which results into smooth running.

 

 

 

running.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3.

 

 

 

Manufacturing of involute gears is

 

 

 

Manufacturing of cycloidal gears is

 

 

 

 

 

 

 

 

 

 

 

 

 

 

easy  due  to  single  curvature  of

 

 

 

difficult due to double curvature of

 

 

 

 

 

 

tooth profile.

 

 

 

 

 

tooth profile.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4.

 

 

 

The

involute

gears

have

 

 

 

The  cycloidal  gears  do  not  have

 

 

 

 

 

 

 

 

 

 

 

 

 

 

interference problem.

 

 

 

 

interference problem.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5.

 

 

 

More wear of tooth surface.

 

 

 

Less wear as convex face engages with

 

 

 

 

 

 

 

 

 

 

 

 

 

concave flank.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6.

 

 

 

The strength of involute teeth is less

 

 

 

The  strength  of  cyloidal  teeth  is

 

 

 

 

 

 

 

 

 

 

 

 

 

 

due to radial flanks

 

 

 

 

 

comparatively  more  due  to  wider

 

 

 

 

 

 

 

 

 

 

 

 

 

flanks.