Vedeneyev M-14P, Maintenance Manual

Page: 162 / 381

175
Arranged on timing intermediate shaft (6) by Woodruff key (10) is drive level gear (8) of the speed
governor drive, made of cemented steel. The drive gear meshes with driven gear (12) of the speed governor drive.
The driven gear is made of cemented steel and transforms into a hollow shank, with internal splines. The
shank rotates in vertical bushing (13). Drive gear (8) of the speed governor drive precludes the driven gear from
dropping out from the bushing.
Coupling (15) of the speed governor drive is connected with internal splines of driven gear (12). The
coupling is made of cemented steel as a hollow shaft.
One end of the coupling is internally splined for mating with shank (2) of the speed governor. The coupling
shank is arranged in a hole provided on the pad for the speed governor on the crankshaft front end.
The outer surface of the coupling has a collar to thrust against the inner splines of the gear which preclude
the coupling from dropping out.
CRANK MECHANISM ASSEMBLY - DESCRIPTION AND OPERATION
1. GENERAL
The crank mechanism assembly of the engine comprises a front cover of the crankshaft thrust ball bearing
(Ref. Pig. 1) and intermediate crankcase (Ref. Pig. 2) which accommodates crankshaft (Ref. Pig. 5) and
connecting rod assembly (Ref. Pig. 6) parts.
The front cover of the crankshaft thrust ball bearing and the intermediate crankcase take up various forces
acting on the crank mechanism in operation.
The crankshaft with connecting rods convert work of reciprocating pistons into rotary energy of the
airscrew. Besides it causes piston travel during non-working strokes and actuates the timing mechanism, blower
and accessories mounted on the engine.
2. CONSTRUCTION
The front cover (Ref. Pig. 1) is cast of magnesium alloy in the form of a truncated cone whose larger base
transforms into an annular flange with holes for studs intended to secure the cover to the intermediate crankcase.
The flange has two shoulders: the front shoulder is used to align the gearbox housing and the rear to align the
cover on the front part of the intermediate crankcase.
Pressed in one hole of the flange is an adapter bushing for supply oil from the gearbox housing to the
guide bushings of the upper cylinder tappets. The cover has a boas at its center for pressing in steel holder for the
crankshaft ball bearing. The holder is locked with three retainers. The boss has a flange at the front with three
studs for attaching the ball bearing steel washer. The seat collar is the rear abutment surface for the ball bearing.
Made in the front part of the cover top is a bracket supported by two stiffening ribs. The bracket has a hole
where a bronze bushing is pressed to serve as a bearing for the bevel gear of the speed governor drive. The
bushing is secured against turning with a
retainer. Oil is fed to the bushing from the pocket in the bracket through two drilled passages.
Made in.the front part of the cover is a boss with pressed-in steel bushing for the ball bearing of the timing
mechanism intermediate shaft. The bushing is fixed with two retainers.
A horse-shoe shaped lug on the rear part is intended to mount timing drive gears. The timing cover is
attached by studs to the lug flange.