Your Ultimate Guide to Marine Engine’s Lubricating Systems

Blog | December 17th, 2021

Heavy-duty shaft bearings are durable and dependable mechanisms. Unfortunately, even a high-performing piece of equipment won’t last long if it’s starved of its lubricating agent. Kemel shaft bearings deal with that shortcoming by using a familiar engineering approach. Basically, instead of hitting the problem head-on, the Kemel solution adopts a divide and conquer strategy. Split into self-lubricating and forced lubricating systems, let’s check out these two intermediate shaft solutions.

Forced Lubrication Systems

The heavy-gauge bearing cradles a wide bore drive shaft. Out on the open sea, there’s no time for stoppages and constant maintenance, so a maintenance-free architecture is recruited. Instead of a grease-packed engine housing and a lubrication nipple, the oil is pressurised and pumped through a lubrication line, into the oil cut ring, and distributed throughout the bearing surface. A return line acts as the fluid outlet, a place where the hot oil exits, passes through a recycling assembly and is returned to the lubricant reservoir.

Self-Lubricating Systems

No additional lubricants are conscripted into service on this occasion. The advantage of this alternative heat mitigation architecture is the conscription of a cooling water line. Again, there’s an oil line in the fluid feed network. But this line, unlike the forced lubrication oil line, is not pressurised. Instead, the low-pressure lube functions as a surface sliding facilitator while the added water line takes over as the system coolant. An extended oil feed prime mover is not required in the self-lubricating mechanism, so no powerful pumps are required to get the oil to the bearing’s inner workings. That feature naturally equals fewer parts, so less chance of an equipment malfunction.

Featuring Chemically Inert Lubricants

There’s so much seagoing traffic in our shipping lanes that a product flaw would equal a potentially massive environmental issue. Kemel shaft bearings negate this drawback by employing biodegradable lubricants. The bearing lubricating compounds function efficiently as shaft friction attenuators but don’t break down into toxic sludge. Neither will the lubricating agent decompose when corrosive saltwater enters the system.

Proposed as a marine engineer’s all-encompassing shaft bearing solution, the two lubricating architectures use their unique mechanisms to dismiss shaft-attenuating kinetic effects. On the one hand, the forced lubricating system forces a pressurised oil into and out of the mating surfaces of the bearing. Meanwhile, the self-lubricating solution reduces the parts count, ejects the oil pump, and opts instead for a low-pressure oil supply, plus a water coolant line.

JAPAN MARINE specialises in spare parts/equipment to ship owners, ship management companies and repair workshops within Australia and other parts of the world. We are the Authorized Distributors of Yanmar Medium Speed Engines, Kemel Stern Tube Seals and Mitsubishi K.K Purifiers, Meson Valves, Mareflex Solas Tapes.

Over the years, we have built a solid reputation in our field by providing high-quality practical solutions to our clients. Our clients include Oil and Gas industry, FPSO projects, Bulk Cement vessels, RoRo vessels, Passenger vessels, General Cargo vessels, Seismic/Survey vessels, Tugs and Trawlers, and Mining and Power Generation, operators.

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