7/30/2019 Design of a Gearbox 1989

1/4

DESIGN OF A GEARBOX

Pro jec t Report Submit ted by

YIAVRIS PAVLOS

in p a r t i a l fu l f i lme n t of the requirements fo r award of theDiploma of t echn ic ian Engineer in mechanical Engin.eering ofthe Higher Technica l In s t i t u t e , Cyprus.

Pro j e c t Superv isor : Mr . V. Messar i t i sLecturer in MechanicalEngineer ing Department,H. T . 1.

Exte rna l Assessor :

Type of Pro jec t : Ind iv idua l

June, 1989f,

7/30/2019 Design of a Gearbox 1989

2/4

ABSTRACT

The aim of t h i s pro jec t i s to design a gearbox fo r thet ransmiss ion of power from a motor to a compressor. Thewhole conten t of the pro jec t i s divided in to 8 chapters .The f i r s t 3 chapters deal with gear ca lcu la t ions . Twomethods a re employed fo r ca lcula t ing the gear dimensionsthe Lewis and Hertz method and the recommended procedure byBS 436.

The next chapter (Chapter 4) deals with the design of thesha f t s where the gears are secured.Chapter 5 deals with the design of the bearings whileChapter 6 conta ins the se lec t ion of the var ious equipmentto be employed in the system.

Chapter 7 deals with the design of the cas ing, includingthe suggested overa l l gearbox dimensions.

The l a s t chapter deals with the cos t of the gearbox,including the individual cos t of each pa r t of it.

I

7/30/2019 Design of a Gearbox 1989

3/4

CON TEN T S

PageAbs t rac t IIntroduct ion I I

CHAPTER 1: Fundamental gear ca lcula t ions1.1 In t roduc t ion1 .2 Gear t ra inCHAPTER 2: Gear dimensions by Lewis and Hertz

method2.1 In t roduc t ion2.2 Gear mater ia l2.3 using Lewis method2.4 Heat t rea tment to achieve surface hardness

and gear f in ish ing a f t e r heat t rea tment2.5 Using Hertz theory

CHAPTER 3: Gear dimensions by BS436

3.1 Introduct ion3.2 Gear dimensions based on contac t s t r e s s3.3 Gear dimensions based on bending s t ress

CHAPTER 4: Design of the shaf t s4.1 Introduct ion4.2 Mater ia l o f the shaf t s4.3 Design o f sha f t (a)4.4 Design o f in termedia te shaf t (b)4.5 Design of sha f t (c)4.6 Design o f the keys

11

334

1313

191931

434345525864

7/30/2019 Design of a Gearbox 1989

4/4

CHAPTER 5 Design of hydrodynamic journa l bear ingsand t h rus t bear ing

5.1 In t roduc t ion5.2 Type o f l ub r i ca t i on5.3 Mater ia l o f journa l bear ings5 .4 Design o f bear ings on s h a f t (a)5.5 Design o f bear ings on s h a f t (b)5 .6 Design o f bear ings on sha f t (c)5.7 Design o f the t h rus t bear ings5 .8 Cyl indr ia l fit

CHAPTER 6: Selec t ion o f o i l sea l s , ro l l i ng con tac tbear ing and bear ing hous ings .

6.1 Selec t ion o f the o i l sea l s6.2 Selec t ion o f ro l l ing con tac t bear ing6.3 Selec t ion o f the bear ing housings

CHAPTER 7: Design o f the cas ing

7.1 Design o f th e casing

CHAPTER 8: Cos t ana lys i s

8.1 In t roduct ion8 .2 Cost of blank mater ia l s8.3 Cost o f equipment8 .4 Cost of hardening and c a s t i n ~8 .5 Labour c o s t

Conclusions

Appendix

Drawings

Page

7070717179858994

959699

101

104104106107108

108