Lieb­herr D9812

Twelve Cylin­ders of Diesel Might De­signed to Con­quer Min­ing’s Harsh En­vi­ron­ment

Diesel Power - - Contents - Words by JOHN LE­HEN­BAUER + Photos Cour­tesy of the MAN­U­FAC­TURER

Twelve cylin­ders of diesel might de­signed to con­quer min­ing’s harsh en­vi­ron­ment

MIN­ING EQUIP­MENT, dump trucks, and hy­draulic ex­ca­va­tors per­form in some of the harsh­est work­ing en­vi­ron­ments a ve­hi­cle can en­dure. The heavy work­loads and dusty con­di­tions in the mines can cause the early demise of me­chan­i­cal com­po­nents.

It’s es­sen­tial that dirt and wa­ter be kept out of en­gines in th­ese ma­chines, as any amount of dust drawn in can shorten their lives sig­nif­i­cantly. How­ever, very fine par­ti­cles like silt and sand are able to find minute open­ings. For this rea­son, it is im­por­tant to en­sure a pow­er­plant is sealed prop­erly from all for­eign mat­ter.

Lieb­herr un­der­stands the con­se­quences of dam­ag­ing par­ti­cles mak­ing their way into a closed me­chan­i­cal sys­tem. So, when the com­pany de­vel­oped the D9812 62L V-12 diesel engine for min­ing ap­pli­ca­tions, one of its main fo­cuses was pre­vent­ing for­eign con­tam­i­nants from en­ter­ing the in­take or crank­case. If an engine’s in­ter­nals are kept clean, it will be more re­li­able and have a long, pro­duc­tive ser­vice life. A high level of de­tail is used dur­ing assem­bly of Lieb­herr’s V-12 diesel to guar­an­tee the qual­ity of the engine’s sealed joints and gas­kets and en­sure they with­stand the bru­tal con­di­tions in the mines. Some of the more crit­i­cal com­po­nents are in­stalled with dou­ble seals to make sure noth­ing can en­ter.

A very high level of oil and air fil­tra­tion is im­ple­mented in the D9812, in­clud­ing the use of a cen­trifuge that spins the oil to sep­a­rate dirt.

Dirt in the crank­case is such a ma­jor con­cern that spe­cial ma­te­ri­als like com­pos­ite bear­ing shells are used so that com­po­nents are less sen­si­tive to oil con­tam­i­na­tion and heavy loads. Wa­ter and dirt in­fil­tra­tion is also ad­dressed in the wiring har­ness. The engine’s elec­tri­cal con­nec­tors meet the pro­tec­tion stan­dard IP6k9k (Ingress Pro­tec­tion [IP] rat­ing sys­tem re­lates to the proven pro­tec­tion against en­vi­ron­men­tal fac­tors such as liq­uids and solids), which guar­an­tees they are wa­ter-, dust-, and arc­tic-weath­er­proof.

As with most mod­ern diesel pow­er­plants, an engine con­trol unit co­or­di­nates all of D9812’s func­tions for peak emis­sions and fuel-con­sump­tion ef­fi­ciency. One of the key com­po­nents

the ECU man­ages is the Lieb­herr com­mon-rail 11.5 fu­elin­jec­tion sys­tem. The engine’s fuel­ing op­er­ates at pres­sures up to 2,200 bar with a mul­ti­point injection that pre­cisely con­trols the amount of fuel be­ing ad­min­is­tered and the tim­ing of each injection event.

The D9812’s mod­u­lar com­po­si­tion al­lows the engine to be eas­ily tai­lored to fit dif­fer­ent ve­hi­cle ap­pli­ca­tions and for op­ti­mum per­for­mance in vary­ing cli­mates and con­di­tions all over the world. Mod­u­lar com­po­nents also sim­plify re­pairs by mak­ing such parts as the tur­bocharg­ers, cylin­der heads, and ex­haust-gas-af­tertreat­ment sys­tems in­ter­change­able.

In­ter­nally, D9812 is 3-D mea­sured, fit­ted with one-piece steel pis­tons (for max­i­mum strength un­der thermo load) and con­nect­ing rods with a fi­nite el­e­ment anal­y­sis (com­put­er­ized method for pre­dict­ing how a prod­uct re­acts to real-world forces like vi­bra­tion, heat, and fluid flow), and has an abil­ity to run at re­duced speeds. By low­er­ing the op­er­at­ing speed from 1,800 rpm to 1,500 rpm, a 20 per­cent in­crease in engine life is pos­si­ble and up to a 5 per­cent fuel sav­ings can be seen with­out any loss in pro­duc­tiv­ity.

The mod­u­lar de­sign of the Lieb­herr D9812 makes the engine eas­ily con­fig­urable for dif­fer­ent ap­pli­ca­tions. The engine is ca­pa­ble of en­dur­ing en­vi­ron­men­tal chal­lenges like arc­tic cold, high al­ti­tude, and hot, arid con­di­tions.

Newspapers in English

Newspapers from USA

© PressReader. All rights reserved.