Architecture Chapter 17 Homework A chain drive is required for a 2 HP electric motor

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CHAPTER 17 BELT AND CHAIN

DRIVES PROBLEMS

BELT DRIVE PROBLEMS

Part 1: Problems 17.1 Through 17.9

Solve Problems 17.1 through 17.9 using the information and ta-

bles given in this chapter and in Table 17.1 on the next page. All

motors are AC motors with normal torque, squirrel cage, syn-

chronous, and split phase; or shunt-wound DC motors; or

DRAFTING

TEMPLATES

To access CADD template

files with predefined drafting

settings, go to the Student

Companion Website, select

Student Downloads and

Drafting Templates, and then

select the appropriate

template file.

59728_ch17_EOC_ptg01.indd 1 03/02/16 10:34 am

multiple cylinder internal combustion engines. Include the fol-

lowing information with each solution:

■ service factor,

■ design horsepower,

■ driven speed,

■ pitch diameter of driver and driven,

■ belt section,

■ number of belts,

■ belt number and center distance,

■ corrected horsepower,

■ belt drive ratio, and

■ belt velocity of driver sheave.

PROBLEM 17.1 A 3 HP, 1750 rpm motor is to operateafur-

nace blower having a shaft speed of approximately 1115 rpm

under normal service. The center distance between the motor

and blower shafts isabout 16 in.

PROBLEM 17.2 A 3 HP, 1750 rpm motor is used to operate a

drill press speed reducer under intermittent service. The spin-

dle speed is about 1136 rpm. The center distance between the

motor and spindle shafts is about 18.5 in.

PROBLEM 17.3 A 1-1/2 HP, 1750 rpm electric motor is used

to operate a woodworking band saw with the blade turning at

1144 rpm, intermittent service. The center-to-center distance

is about 16 in.

PROBLEM 17.4 A 2 HP electric motor with a shaft speedof

1750 rpm operates a printing machine at normal service. The

shaft on the printing machine is to operate at 1167 rpm. The

center-to-center distance is about 18 in.

PROBLEM 17.5 A 2 HP electric motor with a shaft speed of

1750 rpm operates a punch machine at continuous service.

The shaft on the punch machine is to operate at 1108 rpm. The

center-to-center distance is about 17 in.

PROBLEM 17.6 A 1.5 HP motor with a shaft speed of 1750 rpm

operates a compressor at normal service. The shaft on the

compressor is to operate at 1167 rpm. The center-to-center

distance is about 18 in.

PROBLEM 17.7 A 2 HP electric motor with a shaft speed of

1750 rpm operates a printing machine at normal service. The

shaft on the printing machine is to operate at 1115 rpm. The

center-to-center distance is about 17.5 in.

PROBLEM 17.8 A drive is required for an 18 HP motor

driving a fan 16 hours per day. The motor speed is 3600 rpm

and the shaft size is 1.625 in. The fan speed is approximately

2250 rpm and the fan shaft is 1.438 in. The center distance is

38 in. minimum and 41 in. maximum.

PROBLEM 17.9 Given the following layout, prepare a detail

drawing of the pulley on appropriately sized ASME sheet with

border and sheet block, unless otherwise specified by your

instructor. (Use units of inches.) Use the sheetsize, border, title

block, and tolerance instructions provided in Chapter 10,

Dimensioning and Tolerancing.

Part Name: Pulley

Material: Aluminum

1.50 12.0 18.0 A 1 10 — — — 1167 10.57 13.63 A77 15.3 0.96 A81 17.3 0.98 A85 19.4 0.99

1.50 12.0 18.0 C 2 12 — — — 1167 25.92 31.20 C75 15.1 0.82 C96 25.7 0.88 C112 33.8 0.92

1.50 13.0 19.5 A 1 3 — — — 1167 11.07 14.40 A83 16.3 0.98 A86 17.8 0.99 A89 19.4 0.99

1.51 3.7 5.6 A 1 3 2318 4.61 5.62 1159 2.94 3.71 A24 5.3 0.76 A35 10.8 0.84 A45 15.8 0.88

1.51 3.9 5.9 B 1 3 2318 4.64 8.35 1159 3.53 5.53 B28 7.1 0.73 B45 15.7 0.84 B56 21.2 0.89

1.53 3.4 5.2 B 1 6 2288 2.90 6.59 1144 2.43 4.44 B28 8.1 0.73 B45 16.6 0.84 B56 22.1 0.89

1.53 3.6 5.5 A 1 3 2288 4.42 5.37 1144 2.81 3.55 A24 5.4 0.76 A35 11.0 0.84 A45 16.0 0.88

1.53 3.6 5.5 3V 1 4 2288 6.28 7.30 1144 3.63 4.07 3V250 5.3 0.78 3V300 7.8 0.83 3V355 10.6 0.85

1.53 3.8 5.8 A 1 6 2288 4.81 5.87 1144 3.06 3.86 A24 5.0 0.76 A35 10.6 0.84 A45 15.6 0.88

1.53 3.8 5.8 B 1 6 2288 4.31 8.01 1144 3.31 5.32 B28 7.3 0.73 B45 15.8 0.84 B56 21.3 0.89

1.54 2.4 3.7 A 1 1 2273 1.85 2.12 1136 1.27 1.61 A24 7.8 0.79 A35 13.3 0.86 A45 18.3 0.90

1.54 2.6 4.0 A 1 2 2273 2.31 2.70 1136 1.54 1.94 A24 7.4 0.79 A35 12.9 0.84 A45 18.0 0.90

1.54 3.5 5.4 A 1 3 2273 4.22 5.12 1136 2.69 3.40 A24 5.6 0.76 A35 11.1 0.84 A45 16.1 0.88

1.54 3.7 5.7 A 1 3 2273 4.62 5.62 1136 2.94 3.71 A24 5.2 0.76 A35 10.7 0.84 A45 15.7 0.88

1.54 3.9 6.0 B 1 3 2273 4.66 8.36 1136 3.53 5.54 B28 7.0 0.73 B45 15.6 0.84 B56 21.1 0.89

TABLE 17.1

Nominal center distances, number of belts, and arc length factor chart.

59728_ch17_EOC_ptg01.indd 2 03/02/16 10:34 am

CHAIN DRIVE PROBLEMS

Part 2: Problems 17.10 Through 17.16

Solve Problems 17.10 through 17.16 using the information and

tables given in this chapter. Include the following information

with each solution:

■ service factor,

■ design horsepower,

■ number of teeth drive sprocket and driven sprocket,

■ chain pitch,

■ ratio,

■ center distance in chain pitches,

■ chain length, and

■ lubrication.

PROBLEM 17.10 A chain drive is required for a 1.5 HP elec-

tric motor operating a paper machine. The drive sprocket

turns 1500 rpm, and the driven sprocket turns 600 rpm. The

shaft center distance is about 19 in.

PROBLEM 17.11 A chain drive is required for a 1/10 HP

electric motor operating a speed reducer for a belt light pack–

age conveyor. The drive sprocket turns 50 rpm, and the driven

sprocket turns 17 rpm. The shaft center distance is about 17 in.

PROBLEM 17.12 A chain drive is required for a 1 HP elec-

tric motor operating a centrifuge. The drive sprocket turns

10,000 rpm, and the driven sprocket turns 4000 rpm. The shaft

center distance is about 18 in.

PROBLEM 17.13 A chain drive is required for a 2 HP elec-

tric motor operating a centrifugal pump. The drive sprocket

turns 5500 rpm, and the driven sprocket turns 1550 rpm. The

shaft center distance is about 14 in.

PROBLEM 17.14 A chain drive is required for a 2 HP elec-

tric motor operating laundry machinery. The drive sprocket

turns at 1800 rpm, which produces 900 rpm at the driven

sprocket. The approximate center distance is 12 in.

PROBLEM 17.15 A chain drive is required for a 2.5 HP inter-

nal combustion tractor engine operating a generator. The

drive sprocket turns 3000 rpm, and the driven sprocket turns

1800 rpm. The shaft center distance is about 18 in.

PROBLEM 17.16 A chain drive is required for a 2 HP elec-

tric motor operating a pure liquid agitator. The drive sprocket

turns 2100 rpm, and the driven sprocket turns 700 rpm. The

shaft center distance is about 18 in.

DIMENSIONED DETAIL DRAWINGS

Part 3: Problems 17.17 Through 17.23

PROBLEM 17.17 Chain saver (in.)

FOR 1/2

1 AND/OR 1

1 FLAT WIRE BELTS

.250

.631 .363

11.5

.879

25°

70°

1.5

.406

.250

∅

6.484 OUTSIDE DIA.

6.172 PITCH DIA.

5.703 HUB DIA.

SECTION A–A

UNLESS OTHERWISE SPECIFIED:

ALL FRACTIONAL DIMENSIONS

1/32

ALL TWO-PLACE DECIMALS

.010

ALL THREE-PLACE DECIMALS

.005

–

PROBLEM 17.18 FWB SD 18 sprocket (in.)

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PROBLEM 17.19 Chain saver sprocket (in.)

NOTES:

1. SPROCKET CONSISTS OF (2) 6 TOOTH SEGMENTS, AND (1) 7-TOOTH SEGMENT.

2. TOLERANCES TO BE +.003/- .000 ON BD

ALL OTHERS ±.005.

17.05 RD

18.98

18.48 PD

12 × 30°

SPLIT LINES

.50

12 HOLES

11.50 BD

13.50 BC

16.06

HUB

DIA.

∅

SECTION A–A

SCALE 2:1 3.74

.938

.75

.25

20°

10°

2.50

PROBLEM 17.20 Heavy series roller chain (in.) Courtesy HHK Chain Corporation.

59728_ch17_EOC_ptg01.indd 4 03/02/16 10:34 am

PROBLEM 17.21 Conveyor-type standard roller chain (in.)

PROBLEM 17.22 Offset sidebar chain (in.)

59728_ch17_EOC_ptg01.indd 5 03/02/16 10:34 am

PROBLEM 17.23 Sticker chain for the forest industries (in.)

MATH PROBLEMS

Part 4: Problems 17.24 Through 17.29

Find the belt length fxor these pulley radii and center-to-center

distances:

PROBLEM 17.24 r 5 80, R 5 100, d 5 270

PROBLEM 17.25 r 5 120, R 5 120, d 5 1000

PROBLEM 17.26 r 5 50, R 5 300, d 5 400

PROBLEM 17.27 r 5 70, R 5 150, d 5 300

PROBLEM 17.28 r 5 40, R 5 80, d 5 350

PROBLEM 17.29 r 5 101.6 mm, R 5 203.2 mm, d 5 889 mm

59728_ch17_EOC_ptg01.indd 6 03/02/16 10:34 am

312



Chapter 17

Belt and Chain Drives

Solutions to End-of Chapter Problems

Belt Drive Problems

Part 1: Problems 17.1 Through 17.9

PROBLEM 17.1

313



PROBLEM 17.2

PROBLEM 17.3

314



PROBLEM 17.4

315



PROBLEM 17.5

316



PROBLEM 17.6

PROBLEM 17.7

317



PROBLEM 17.8

In conclusion, the design solution to the sample problem is as follows:

318



Chain Drive Problems

Part 2: Problems 17.10 Through 17.16

PROBLEM 17.10 No solution provided.

PROBLEM 17.11 No solution provided.

PROBLEM 17.12

319



PROBLEM 17.13 No solution provided.

PROBLEM 17.14

320



PROBLEM 17.15 No solution provided.

PROBLEM 17.16 No solution provided.

Part 3: Problems 17.17 Through 17.23

PROBLEM 17.17 Chain saver (in.)

321



PROBLEM 17.18 FWB SD 18 sprocket (in.)

322



PROBLEM 17.20 Heavy series roller chain (in.)

PROBLEM 17.21 Conveyor-type standard roller chain (in.)

323



PROBLEM 17.22 Offset sidebar chain (in.)

PROBLEM 17.23 Sticker chain for the forest industries (in.)

324



Math Problem Solutions

Part 4: Problems 17.24 Through 17.29