Transmissions Flashcards
what are the main functions of a gearbox?
Transmit power from the prime mover to the shaft
allow for variations in speed and power
allow for changes between ahead and astern thrust
what are the main components of a gear box?
plummer block bulkhead gland seals stern seal A bracket SKF coupling propeller
how do you change the speed of a gear train?
by adding a second gear to the first
how do you change the direction of a gear train?
by adding different size gear wheels
State 4 type gear profile
explain the construction and advantages of a double helical gear
2 helical gear back to back, with the angle of gear cut in opposing directions.
Adv- no thrust eliminating the need for thrust bearings
explain the construction and advantages of a worm gear
state the 3 methods of gear reduction
explain the purpose of quill shaft
state the checks when applying and releasing a shaft break
where can the shaft brake be operated
what are the main components of gearbox?
how is the gearbox oil kept at the correct temperature?
how often are the FL cut-ins checked and at what pressure will they energise the MD pump?
function of the Thrust Block?
What is the purpose of the turning gear?
what is the function of the plummer block?
what is the purpose of the Bulkhead Gland Seal?
what is the function of the A-Brackets
what are the main components of a plummer block?
what principle does a plummer block use for lubrication?
what substance does a bulkhead gland seal use and how is it inserted?
what is fitted to a stern seal in the event of an emergency
what do the A brackets use for lubrication
what are the three sections of shaft line
how are the thrust and intermediate section connected
how are intermediate and tail section connected, and how does this connection work?
what are the two main types of propeller used?
what hazards are associated with a transmission system?
draw the shaft line layout diagram
