Can anyone provide either A) a lay person explanation for how inboard propeller shafts keep water out of the bearing and from getting in the ship or B) a schematic demonstrating as much?Thanks in advance dudes.
>>2866078>rotary shaft sealyour boats gonna sink ranjeet
>>2866078>Can anyone provide either A) a lay person explanation for how inboard propeller shafts keep water out of the bearing and from getting in the shipWater gets in, it just gets pumped out
>>2866084>>2866078All boats have some water in their bottom, its called Bilge, it just gets pumped out
>>2866080A.k.a. “Mechanical seal” or “pump seal”, “face seal”Two magic parts spinning together to keep water out using Voodoo. One part spins with the shaft, the other part is fixed to the housing. The two parts are generally made of some kind of high tech material such as carbide paired with self lubricating graphite. These fuckers can spin all day, and they stay stuck together
>>2866078>how inboard propeller shafts keep water out of the bearingmost smaller boats with shaftdrive use cutlass bearing, meaning the bearing is made of rubber, the cutlass bearing use water as a lubricant.>from getting in the shipyou use a shaft seal, shaft seals comes in many shapes and sizes, you cann have rope seals for example where you compress rope axially around the shaft to create a seal
>>2866078Actual marine mechanic here. There's two kinds of output for inboard engines to the outside propeller. When most people refer to inboards, they're talking about an engine set inside of an interior engine compartment that has a gearcase assembly (called an outdrive) attached through a thru-hull fitting. This fitting has a rubber convoluted tube (called a bellows) that shrouds over the universal joint drive shaft between the engine side of things and the pinion shaft on the inside of the outdrive. This part remains out of the water most of the time. If you're talking about a propeller shaft that actually comes directly out of the engine and goes through the hull to drive a screw in front of a rudder, the area that the shaft passes through is called a stuffing box. >>2866636This poster is correct. Stuffing boxes are made with rope impregnated with sealant, in most cases wax. >picrel. Outdrive assembly is on the left, stuffing box is on the right. I also added in a cross section of a propeller shaft bearing for a typical outdrive assembly. Sorry for the shitty collage.
