OP-755 Part 2 Pages 197-401 - Personal Page of GENE SLOVER

205
cams. The worm rotates with the output shaft
and has fixed value of 60 revolutions per 30:
degrees of proj ectile ring movement. The worm
wheel makes one revolution per cycle of ring
rotation. .
Couplings
11. Five flexible couplings are used to interconnect
the units of the drive and to couple the drive assembly to the
driven projectile ring worm gear. These are of commercLaI .design
and manufacture, of three different types, with installed
arrangements as shown on drawing 271675. .
(a) AuxiZiary pump coupling. - A Falk Steelflex
coupling provides direct drive coupling from
the electric motor rotor shaft to the auxiliary
pump rotor shaft. The unit is enclosed with-cin
the electric motor end housing. It is an
assembly of two identical steel hubs, a spe.~
cially heat treated and tempered alloy st.eeL
grid spring, and two duplicate steel shells
which form the cover. The design gives drive
connection through the grid spring whi.ch . is
nested in grooves that are accurately milled
in the outer flange of each hub ; . The hubs
and grid spaces are packed with lubricant confined
within the steel shells. The unt.t is
designated by the manufacturer as: - Falk size
3 FAS.
(b) A~end c ou p t ing. - A Falk Steelflex coupling
of the same design as the above provides direct
coupling from the electric motor r-ot.or- shaft;
to the A-end shaft. This unit isdesignatgd
by the manufacturer as: - Falk size' 9 FAS. '
(C) B-end response coupZing. - A special coupling
of Oldham type provides the response drive
connection to the control cam shaft. This
design incorporates a floating center member,
constrained to slide across the face of one
coupling flange on,a Ilne passing through the
center. At the same time this center member
is free to slide across the face of the second
flange in a direction at right angles to the
first. The block-shaped center piece is equipped
with special removablegraphite-impregnated
bearing strips which, together with grease
reservoir (in the block), provides primary and
secondary lubrication. The coupling is an
American Flexible Coupling Co., size 8-1/2,
unit.