"'*qf Eil'i TINTVERSITI TLi-l.l HIISSEII'{ ONI}{ N4ALAYSIAtY""J Faculty o f Mechan ical and.Manufacturirg Engine er hg

COI]RSE INFCRI\{ATION

COTIRSE TITLE: ENGINEERING LABORATORY m CBDA 77101)

TOPIC 5: LINIYERSAL COUPLING

NTRODLCTIO\

A flexible coupling or rmiversal joint is frequently used to link with two shafu andfuansrait circular motion from the other- Indeed continuous circular motion isperhaps the single largest fhing that ma::kind produces in the world with theavailable energ"y. A universal joint is simply and combination of machineelemen'rs whichtansmitrotation from one axis to another.

') OB.rECTN'ES

The objective of this experiment is to investigate the effect of introducinguniversal couplings to a simple drive shaft and to check the uniformity of angularmovement between the driving and the diven end. oi the shaft Ln a straight lineassen'rbly and then again u,ith an angular tran-sirlission. A fi.ir-rhei objective is torepeat these tests with the coupliags set r.rp ai jrcorrect positioa a-.sembly to seehou"this Lrterferes with unifcrm ansraiar tr^nsnission.

3. LEARNI]{G OTMCOMES

At the end of this experiment, students should be able to understand the operatingprinciples and application of the universal coupliag.

4. E}GERTMENTA-L THEORY

Shafts are used to transmit rotary motion and in most cases these shafts rotate inbearings set in a sfoaight line. However, there are cases where the shaft cannot bestoaight and it has to be operated through an angie X, refer Figure 1. A goodexample in common use is the shaft which transmit powff ftom a motor carengme through its gearbox to the back axie to drive the rear wheels. Here the shaftis generally at an angle and the operation is firther complicated by the fact thatthe angle varies when the motor car fl"rls over brimps in the road.

Such condition can be satisfied by the use of universal couplings as shown at Aand C in Figure L. For uaiform power transmission the design and assembly ofthe two couplings must be carefully considered.

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r."wj LINTV.ER.SITI Tt]}i HUSSEN ON\ }LALAYSL{Facuity of N4echanical and \4anufacturing Engu.,e eriiq

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Figure 1: Universal Coupli:rg Diagram

EXFERtrMENTAI, E Q LTP h{E,NT S

Table 1 : Universal Coupling Equipment List

No. Apparafus Qty.

1 Universal Joint Assembly 1

2 Knurled Screws 2I-) Knurled Nuts ')

6. EPERT}TE}ITA]- PROCEDTJRES

6.L TEST 1

1. Joint assembly to the panel board in a convenient position.2. Set right coupling so that the shraft is in a sto'aight line. Refer to A-B

position in Figure 1.

3 . Set the left and right coupling position with tighten the screws D 1, D2, D3

and D4. lPlease refer to Figure 2 for the eorrect couplings and screws

positionl.Now set the right and 16ft coupliag scales as 0 degrees.

Move the Ieft hand scale at 20" increments and note the reading on the

right hand scale.

Repeat this at 20' increments until i80' is reached a:rd recorded.

4.5.

6.

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ffiFigure 2: Coupling position for Test 1 and Test 3 (top view)

6.2 TEST 2

Set right coupling so that the shaft is in a straight iine. Refer to A-Bposition in Figure 1.

Set the ieft and right coupiing position r"'ith iighten the scrervs D1, D2, D3

andD4.lPlease refer to Figure 3 ior the correct couplings and scres'spositionlRepeat prcce:u3 r- r :l-i: ,61 h ;est 1.

1.

Figure 3 : Coupling position for Test 2 ar.d Test 4 (iop vieu')

TEST 3

Remove the right coupling assembly and move it to Position C as shownin Figure 1.

Set the left and right coupling position with tighten the screw-s D1, D2, D3and D4. fPlease refer to Figure 2 for the correct couplings and screwspositionl.Repeat procedure (4) until (6) in test 1.

6.4 TEST 4

Sti1l in Position A-C as shown in Figure 1.

Set the left and right coupling position with tighten the screws Di, D2, D3and D4. [Please refer to Figure 3 for the correct couplings and screws

positionl.Repeat procedure (a) until (6) in test 1.

1.

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3.

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6.3

2.

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1.

2.

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i" reil ''. fINIT\ER.SITi TtiN I{USSEN ONN I\ALAYSLAt"YJ Facuity of Mechan-ical and Manufacfuring Engineering

7. OBSERVATIONS

i- Complete the Tabie 2.2- Piot the graph Rieht Hand Dial againstleft Haad Dial Resuit for Test 1,

Test 2, Test3 and Test 4.

8. DISCUSSIONS

1. Discuss the graphs obtained.2. Discuss about shaft and coupling in the straight line assembly-3- Discuss about shaft and coupling in a:rgular assembly.

g. QUESTTONS

1- Give two (2) exampie of Universal Couplings application in mechanicalengineering.

Z- How Unrversal Coupling rvorks in both example in question 1-

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10. CONCLUSION

Deduce conclusions from the experiment. Please comment on your experimentalwork in terms of achievement, problems faced throughout the experiment andsuggest recom m endation for improvements.

i au - i6zLL. DATA SHT"ETS

TABLE 2: RESULTS

TEST 1 TEST 2 TEST 3 TEST 4Coupline Coupling Couplins Coupline

Left Rieht Left Rieht Left Rieht Left Rieht0 0 0 0

20 20 20 2040 40 40 40

60 60 60 60

80 80 80 80

100 100 100 100

720 120 720 DA140 140 140 140

160 160 160 160

180 180 180 180

* Data sheef must approved by the instructor

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