Medicaps Institute of Technology and ManagementCase Study onTransmission SystemSubmitted by:Pratik AgrawalMech-B-VI-!"#ear MaterialsMaterial Hardness Typical Heat Treatment, CaseCore SpecificationRcBhnCharacteristics, and Uses Case-Hardening SteelsAISI 1! AISI 111"5560160230 Carburize, harden, temper at 350F. For gears that must be wear-resistant. orma!ized materia! is easi!" ma#hined. Core is du#ti!e but has !itt!e strength.AISI #1$AISI #1#50552$03$0%arden, temper at &00F, itride. For parts re'uiring greater wear resistan#e than that o( through-hardened stee!s but #annot to!erate the distortion o( #arburizing. Case is sha!!ow, #ore is tough.AISI #"1%AISI #"!AISI &"1%AISI &"!) 5560 ) 55601$0260 200300Carburize, harden, temper at 350F. For gears re'uiring high (atigue resistan#e and strength. *he +6,, series has better ma#hinabi!it". *he 20 point stee!s are used (or #oarser teeth.Carburize, harden, temper at 300F.AISI '$1 5+63 250350-rimari!" (or aerospa#e gears that are high!" !oaded and operate at high pit#h !ine .e!o#it" and (or other gears re'uiring high re!iabi!it" under e,treme operating #onditions.*his materia! is not used at high temperatures.%arden, temper at 1200F, itride.(itralloy ( and Type 1$% Mod) *1%-(+ &0&/3003$0For gears re'uiring high strength and wear resistan#e that #annot to!erate the distortion o( the#arburizing pro#ess or thatoperate at high temperatures. 0ear teeth are usua!!" (inished be(ore nitriding. Care must be e,er#ised in running nitrided gears together to a.oid #razing o( #ase-hardened sur(a#es.Thro,gh-Hardening SteelsAISI 1#%AISI 11#2//0 1%arden and temper to re'uired hardness. 2i! 'uen#h (or !ower hardness and water 'uen#h (or higher hardness. For gears o( medium and !arge size re'uiring moderate strength and wear resistan#e. 0ears that must ha.e #onsistent, so!id se#tions to withstand 'uen#hing.%arden 3oi! 'uen#h4, temper to re'uired hardness.AISI #1#AISI #$#2//0 1 For gears re'uiring high strength and wear resistan#e, and high sho#5 !oading resistan#e. 6se /1,, series (or moderate se#tions and /3,, series (or hea." se#tions. 0ears must ha.e #onsistent, so!id se#tions to withstand 'uen#hing.Some e$am%les o& case hardening steels are"'(iCr"Mo"') *n++)*n+,)*n,")"-Cr(iMo.Some e$am%les o& (itriding materials are,Cr/Al"Mo"!) *n,C) *n ,"A) (itrolloy) +,CrAlMo'The Abo0e gra%h is used &or the calculations1CVT Tuning &or Polaris2i3erent Alternati0es o& Current 2i3erential arrangementSP445A s%ool is a de0ice that connects the two a$les directly to the ring gear1 There is no di3erentiation side to side) so a 0ehicle e6ui%%ed with a s%ool willbark tires in turns and may become unmanageable in wet or snowy weather1 S%ools are usually reser0ed &or com%etition 0ehicles not dri0en on the street17,8Mini-s%ool uses the stock carrier and re%laces only the internal com%onents o& the di3erential) similar in installation to the lunchbo$ locker1 A &ull s%ool re%laces the entire carrier assembly with a single machined %iece1 A &ull s%ool is %erha%s the strongest means o& locking an a$le) but has no ability to di3erentiate wheel s%eeds whatsoe0er) %utting high stress on all a3ected dri0eline com%onents1The internal s%ider gears o& an o%en di3erential can also be welded together to create a locked a$le9 this method is not recommended as the welding %rocess seriously com%romises the metallurgical com%osition o& the welded com%onents) and can lead to &ailure o& the unit under stress1 I& it is desirable to ha0e a s%ooled a$le) the better o%tion is to install either a mini-s%ool or a &ull s%ool15imited Sli% 2i3erentialA limited-slip diferential :LSD; is a ty%e o& automoti0e di3erential gear arrangement that allows &or some di3erence in angular 0elocity o& the out%utsha&ts) but im%oses a mechanical bound on the dis%arity1T4ned by the Tor6ue Bias