The internal gear is made of an elastic resin and is separated from {HEAD ~ the casing} of the system or {TAIL ~ a metal ring} fitted in the casing by a predetermined gap 
of
The internal gear is made of an elastic resin and is separated from { HEAD ~ the casing } of the system or { TAIL ~ a metal ring } fitted in the casing by a predetermined gap
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH