Marine Gear Box

Applications	How to Fit Marine Gearbox	Precaution
Structural Overview	Performance	Advantages
Features

The drive is directly connected to the propeller in a traditional Marine gearbox. Marine gearboxes fulfill a multiple number of marine related purposes. To meet each and every purpose, these marine gears have a large number of different configurations and installation processes also. As different marine gears have different viscosity grade, therefore, at the time their selection, viscosity grade of these gears should be checked properly. The viscosity grade of the gears largely influences the speed, heat resistant capacity and gear geometry.

Applications of Marine Gear Boxes
The marine gears are commonly used in different marine vehicles like work boats, fishing boats, yachts etc. Main propulsion, centrifuges, deck machinery like winches, cranes, pumps, elevators, turning gears and rudder carriers are the main widely used applications of the marine gears.

How to Fit Marine Gearbox
Generally, with two or more then two engines, Marine Gearboxes are attached. This kind of attachment is found in the commercial vessels, like roll-on, roll-off ships, ferries etc. After preparing the full blue-print of the fitting arrangements of this kind of gearboxes, the manufacturers should proceed for their actual production. The fitting process of the gears in the boxes may arise some intricacies. These intricacies are due to the existing problems in the boxes, immediate base of the boxes and the ship itself.

Precaution with Marine Gearboxes
The casing of the marine gearbox must be built very firmly. To prevent the marine gear from water, the gears should be kept in mesh. The casings of the gearboxes should provide extra strength with double engine designs and ribs.

Structural Overview: Marine Gearboxes
In a simple these Gearbox, the total number of gears which are present is 16. Apart from these gears, there is an input shaft and an output shaft. The industrial purpose marine gearbox, there are four gears, three shafts, an intermediate and one shift each for input and output.

What is a High Performance Marine Gear
The physical appearance, working capacity, performance standard and other features of high performance marine gears are significantly noticeable. The size of these gears comes in the range between 300 mm to 5 meters. The power requirements of these gears are also comparatively low, but their performance is high. For example, the marine gears inside the fast craft vessels are able to work minimum @ 25 knots (29 mph) which is a high standard performance. These type of gears are used in luxury yachts, ships, petrol boats etc. The power and weight ratio of the high performance gear is generally more than 1.5 kw/kg. The usual pitch rate velocity of these gears is at least 120 meters per second. The reliability of such type of gears is also very high. Generally, in common type of marine gears, there is a high probability of teeth failure and if this happens then the vessel will be stopped in the water. This thing is not happened in high performance marine gears. Today, the requirement of these kind of gears is prevailed for manufacturing of large size gearboxes for large size ships and other water vessels. These gears provide complicated design of the gearboxes.

Advantages of High Performance Marine Gearboxes
The external forces which comes from the surrounding structure or quivered forces from the propeller, must be resisted by the high performance Marine Gearboxes. These external forces are in such a way so that these can be absorbed by the high performance marine gearboxes within the prescribed limit. This prescribed limit is significantly high in case of Marine Gearboxes. Generally, it is considered that general marine gearboxes can absorb a assignable of 20% of the full scope of the external forces but for high performance marine gearboxes, this limit is up to 30%. The extra sucking up capacity gives extra tolerance limit to the high performance gearboxes against any damage. If these gears don't contain this extra tolerance limit, then the entire bearing assembly would become overloaded, disrupts the oil film and lastly, devastates the bearing.

Features of Marine Gearbox

• Marine gearboxes normally take less space.
  
  
• These gearboxes have high mechanical rotational force (torque) capacity.
  
  
• The speed of such gearboxes depends upon their reduction and size. Normally, the speed varies between 900 to 1,800 rpm.
  
  
• The reduction marine gear boxes can be obtained without reversing their functions.
  
  
• Both coaxial and offset configurations of the input and output shafts in such gearboxes are possible. The offset configuration can again be either vertically, horizontally or diagonally.
  
  
• The composite design of such gearboxes brings versatility in their production capability and in spare stocking.