Worm-Gear Reducers Reach New Heights - Kop-Flex - #3

mcnts. The ma­chine applies a predetermined

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liearfnR cups anil PBUMTg die MM Mack heiRht At (hi* same time, a mas> tcr wurm engage* j nil oscillates the oulpui worm Rear in lind the exact center of curvature lor the gear i«ih. The machine then fnriiMirrHhr dta* tincc In iv. - en ihis \ centerlinc and the* rear-bearing cup,

Thccomputrr u>n compare* the ouipu subassembly stack height lo the- distance between ilic housing Inuring seats and calculates the shim puck required (or the de* sired hearing endpiay. Us­ing die worn,-gear cm№ Mae messuremefll, 1 AN9 assemblers how to distribute shims between the (font and rear branny to prrefoely center ihe Rear in the Iwiusinjt Measurement accuracy h ftO.fJOl In. Total cycle lime. excluding loading and unloading, U less than iO sec.

Although there are dozens of stock breather* and vem plugs on the market. KPT testing found none to he totally effective under all operating conditions. Variables such as input/output speed, direction of rotation, oil level and viscosity, and reducer mounting position all afiVci breather performance

In one way tn another, all breathers U: m flow between the titside and outside ol the gear Mte as the unit warms during startup and cools after shutdown II the breather is completely shielded from lubricant sphish Inside the reducer almost any design will he effective. I nfurumalely. this Is usually not ib- case, particularly sincr most gear* redder housing can mount in a variety of put lions If the breather is exposed to evil splash, a bubble of oil typically forms across ihe breathers inside orifice, and escaping warm air carries it to the outside, (her time, these small droplets actu-motile unul the unit is vkihh "leaking

A novel design that uses a simple coil spring mounted In the breather's atr passagcu-av tt&fB

Hi i i novel breorher plug fcoturei q Jprrog rfwt pr*v*nt> oil bubbles from Forming ond pertolotiog to the ootsWc.

ihe problem The interior ol tlie spring

doe> not | -[.....:- a continuous Mtrfaa⁴

where bubbles can form, and thi* riiminatci the pcrcoLlling cflcct and resuhinR oil transfer.

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saiisfacloiy life, oil seals must haw 2 thin oil film In-tween the seal lip and mating shaft journal. This comhlioti, known as hydrodynamic lubrication, needs shaft surface* that are not per­fectly smooth bul have microscopic pockets to help maintain the lubricant film. ^though plunge grinding is niosl widely used to finish seal journals, the resulting suffice i> no! deal from this standpoint Other finishing methods, such 2s shot pecning and liquid honing, provide a matte h\*< finish which is generally raorc vffcciivc Iban a plunge-grotind surface, However, csen dicsc mcth-ods often leave raised, sharp corners thai separate die resulting microscopic indenta-lions, again providing potential suiting points

for

Aseal-lounial surface thai features an murled shorpecned texture, *ith raised (ratlter than in* dented) spherical lobes and com*spoudmR baileys in between, belter sttpfiom hvdroihnamic lubri* cation. ! i-^Tl ..■■■.■!' i - ■.: a process that compresses seal journals between burnishing dies that have been peened to create random spherical deprev sfoH This leaves an urange peel" texture on the lounial surface. r\ \ *:calh with a 20 to №/iUt sur­face roughness.

i filler magnification, the surface has closely spaced spherical lobes with valleys between The spherical lobes provide an extremeh- smooth sur-faci* for the seal lip to ride aR*iinsi wtiile the 1 jIIcas retain lubricant and pruntote : 1 ■ 4>iianiic lubri­cation. Tesls shtkw this surface increases scnil life hv four to fiu* times when compared to pIuiiRe-RTound shafts. ■

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