Differential plate angle tooth replace

Hello everyone,

zbog damage na bevel gear od rear axle driveMorao sam. replace a bevel i crown gear.
Ja noticed a damage through a typical howling noise when changing loads. Running line approx. 160TKmNafta je bila... changed regularly - Zašto je damage occur Sada...?

Scuffing na bevel gear - Ne signs od scuffing na ring gear, ali increased roughness od tooth flanks.




Pa sam delved deeper into a topic again i would like na pass na some information za tebe...

U axle drive na Daily je hypoid gear, kao što je usual with rear-wheel drive vehicles. This means that a axis od bevel gear shaft je lower than that od ring gear. (positive axis offset)
Advantages - smoother running, higher load capacity zbog larger bevel gear, more teeth su engaged na same time, lower position od cardan shaft je advantageous u cars.

Disadvantage - zbog stronger sliding movement od teeth, there su higher friction losses (efficiency), higher demands na material i lubricant (> hypoid gear ulje)

U toothing na IVECO je od Klingenberg type, tj. tooth backs have a constant width.

Bevel i ring gears su always replaced kao pair (they have a pairing number) i jesu only available za 4x4 from IVECO with ET 7170858, 

https://www.suonama.com.cn/products/differential-plate-angle-tooth-for-iveco-daily-4x4-4x2?_pos=1&_psq=9%2F40&_ss=e&_v=1.0&variant=31613152198769

Bevel &Amp ring gear i measuring dummy


In addition, ako ga koristite cpl . &Amp want učiniti...right" :

- 2x tapered roller bearings bevel gear shaft 42471125 (staro 7162215) original from Timken: HM803110 - inner diameter: - 41.275 mm, outer diameter: 88.900 mm, tot. Width: 30,163 mm
- 2x tapered roller bearing differential/ring gear shaft 1905216 (staro 7164410) Timken original: Y32014X - Inner diameter: 70 mm, outer diameter: 110 mm, tot. Width: 25 mm

- ... Simmerring na flange (12) - ima IVECO Et Nr 40101693 (~50,-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa from Corteco i since a article Nr 12015770B - dimensions 90mmx60mmx13mm

- veliki orah na flange - IVECO ET 7162213

- Ako necessary, shims za bevel gear shaft (2 sets u increments od 0.025 mm)
- Ako necessary, individual shims na ring gear (u) increments od 0.05 mm)

Adjusting/screw ring za bearing preload od differential housing



i dalje special tools:

a dummy bevel gear shaft IVECO ET 99370309 (ili pokušajte instead od measuring)
Dial gauge with holders
Outside micrometer za measuring a adjusting discs
Puller (separating knife)
3/4 oraščić 36mm
friction coefficient ili Drag torque meter
counterholder za cardan flange - self-made
tool za locking a adjusting ring/screw ring - self-made
torque wrench (min.450Nm)
spotting paste


U torque na picture je previše. small with 350Nm, I. used a larger jedan - 3/4 80cm na 750Nm.



Kao comparison value, I. have/wanted na measure a existing drag torque od starog axle drive before disassembling To je to. However, this je tako small (approx. 0.3Nm) that To je bio irrelevant za novi setting. U backlash between a bevel gear i crown gear je sada previše large.



U process -

drain ulje na remove, unscrew a cardan shaft na flange, loosen orah na flange, which nije easy with a axle installed, since To je VERY tight (tightening torque 450Nm). Da bi se this, I. blocked a flange with a tool i operated a toggle od 3/4 socket with a jack.
Remove a cover from a axle housing i unscrew dva bearing brackets. Unlock a bearing preload adjuster i continue screwing towards a diff na relieve a bearings. Sada diff together with a ring gear should Budi removed. Ali... that didn't work because a inner ring od right bearing bio previše tight na svom seat. Pa sam morao drive a bearing, which will Budi replaced anyway, inwards (left) with a mandrel until there je enough play, sada ja could remove Cpl. take Van iz unit. Ti should ne miješati adjusting i shim washers.
U bevel gear shaft Mogu li sada also Budi easily removed, together with a spacer sleeve i small shim. Lever Van iz Simmerring na flange i drive Iz dva outer rings od tapered roller bearings with a mandrel. Ja have a brass pick da ne bi damage anything. U inner bearing ring also ima shim i a large shim.


When making a settings / measurements, various default values ​​must Budi achieved

- ... axial installation position od bevel gear shaft (adjusting washer) > measurement > calculation
- ... correct preload od bevel gear shaft bearings (adjusting washer) > friction value 1.2 - 2,4 Nm
- ... correct preload od bearings od Diff housing (screw ring) > friction value 2 - 2,8 Nm
- ... axial installation position od diff housing / ring gear (adjusting washers)

resulting u backlash from ring gear na bevel gear (0.15 - 0.20 mm) i contact pattern > how/where a teeth touch.

Dakle, ako ste follow a IVECO repair instructions, strength od large shim za axial alignment od bevel gear shaft je first determined with a help od dummy bevel gear shaft. Koristiš dummy because njegova bearing surfaces su slightly undersized i bearing inner rings Može biti removed i installed za measurements without bilo koji problems.
This je quite tricky, because Ti have na zero a dial gauge na holder base A ti... need a VERY flat surface za this. (exact procedure u guide)


built-in dummy


dial gauge na dummy


U current bearing preload (coefficient od friction) je determined od installing a dummy shaft i tightening a flange oraščić (450Nm) i, ako necessary, od exchanging a small Shim adjusted na desired 1.2 Nm do 2,4 Nm.

Bevel gear shaft shims 

https://www.suonama.com.cn/products/driving-gear-shim-7165064-7165066-7166992-for-iveco-daily?_pos=1&_psq=shim&_ss=e&_v=1.0


Friction measurement



Sada diff Može biti installed with novi ring gear, novo bearings i stari shims. U bearings su preloaded with a screw ring according na guideline i backlash from a bevel gear na crown gear (0.15 mm na 0.20 mm) je determined with a dial gauge. Depending na deviation, diff with a ring gear je removed again i installed with other shims i measured again.


Ako je correct, total friction torque Može biti measured. Here a guide gives a incorrect value od 20 Nm do 28 Nm. That Ne može biti. since a bearings od bevel gear shaft should have 1.2 Nm <> 2,4 Nm i those od diff 2 Nm <> 2.8 Nm. Ako ti want na measure a total friction torque na flangeTi... have na take a ratio od 5.22 into account. Only a friction torque from a diff bearings ima effect divided od 5.22. Dakle, za example, na min. 1,2 Nm + (2 Nm : 5.22) = 1,6 Nm (ili na max. 2,4 Nm + (2,8 Nm): 5.22) = 2,9 Nm.

Ako backlash i coefficient od friction matchTi... should definitely check a contact pattern. That je, kako je teeth roll isključeno each other. Da bi se this, teeth od ring gear su coated with spotting paste. Then a crown wheel je braked strongly (npr. mounting lever between crown wheel i housing) i bevel gear shaft je turned na flange. This results u imprints od bevel gear tooth flanks na ring gear tooth flanks. This should Budi approximately u middle od teeth.





Ako je contact pattern je correctTi si... done ;-) i može secure (caulk) adjusting ring na diff i flange -Lud.

Ako ne, installation position od ring gear ili bevel gear shaft must Budi corrected accordingly :-(