Vedeneyev M-14P, Maintenance Manual, Page: 222 / 381

2.7. COMPRESSOR DRIVE
The compressor drive comprises housing (8) (Ref. Fig. 3) and torque-limiting pin coupling.
Housing (8) is made of aluminium alloy and has a round flange with six holes to receive the attachment
studs, one hole to supply oil to the compressor, two holes to drain oil from the compressor space and three milled
flats to remove the housing from the engine.
The torque-limiting pin coupling protects the rear cover drive parts against breakage in case of
compressor wedging.
The pin coupling comprises gear (11), two half-couplings (9) interconnected by steel pins (10).
Bevel gear (11) meshes with the bevel gear of the vertical shaft.
Provided inside gear (11) is a band with internal cylindrical splines to receive external splines of one of
half-couplings (9). The second half-coupling has internal splines for coupling with the air compressor shaft.
When torque exceeds the permissible limit (at compressor wedging) pins (10) of the half-couplings are
sheared off and the compressor drive is disengaged.