Reference
Modification no.
- 0 -
Page
61
Date
1997 02 01
Main
914 F
01476
9.6) Propeller gearbox
Reduction ratio, crankshaft to prop shaft is 2,4286 to 1.
The propeller shaft is driven by the crankshaft via a straight spur gear Q.
The design incorporates a torsional shock absorber. The shock absorbing is based on
progressive torsional cushening due to an axial spring load E acting on a dog hub W.
The design includes also a friction damped free movement at the dogs to warrant
proper engine idling. Due to this backlash at the dogs a distinct torsional impact arises
at engine start and stop and at sudden load changes, but due to the integrated overload
clutch it will remain harmless.
◆ NOTE: This overload clutch R will also prevent any undue load to the
crankshaft in case of ground contact of the propeller.
9.6.1) Gearbox version
See Pic. 32.
3 gearbox versions are provided for Engine Type 914 F.
➪ Version F2:
Hollow prop shaft with flange for fix pitch propeller of for propeller electri-
cally in-flight adjustable.
➪ Version F3:
Propellershaft with flange for variable pitch prop and drive for hydraulic
controlled constant speed propeller.
➪ Version F4:
Propellershaft with flange for fix pitch prop but prepaired for retro-fitting of
hydraulic controlled constant speed propeller.
◆ NOTE: The propeller flange and hub is equal on all three gear box
versions.
Version F3
Version F2, F3 and F4
Pic. 32
1
3
4
2
00140
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