Belt Selection Procedure-FENNER

Click here to load reader

  • date post

    17-Oct-2014
  • Category

    Documents

  • view

    409
  • download

    14

Embed Size (px)

Transcript of Belt Selection Procedure-FENNER

4

SYNCHRONOUS BELT DRIVES

Fenner Torque Drive Plus 3 and HTD DrivesSERVICE FACTORS - for selecting both Torque Drive Plus 3 and HTD drives.TYPES OF DRIVEN MACHINE SPECIAL CASES For speed increasing drives of: 1.00 - 1.24 - no additional factor 1.25 - 1.74 - add 0.1 1.75 - 2.49 - add 0.2 2.50 - 3.49 - add 0.3 3.50 and greater - add 0.4 Seasonal / intermittent use - subtract 0.2 Idler pulley used on drive - add 0.2 LIGHT DUTY Agitators (uniform density), Bakery machinery: Dough mixers, Blowers except positive displacement. Centrifugal pumps and compressors. Belt conveyors, (uniformly loaded). Exhausters. Fans up to 7 kW. Paper machinery: .5 Agitators, calenders, dryers, Printing machinery: Linotype machines, cutters, folders. Screens: Drum, conical. Woodworking machinery: Lathes, band saws. MEDIUM DUTY Agitators and Mixers (variable density), Belt conveyors (not uniformly loaded), Brick and clay machinery, augers, mixers, granulators. Fans over 7 kW. Generators, Line shafts. Laundry .5 machinery. Punches, presses, shears. Printing machinery: Presses, newspaper, rotary embossing, at bed magazine. Pumps: Positive displacement, rotary. Screens, vibrating. Machine tools. HEAVY DUTY Blowers, positive displacement. Bucket elevators Centrifuges. Conveyors: Drag, pan, screw. Paper machinery: Beaters, jordans, mash pumps, pulpers. Pumps, piston. Pulverizers. Woodworking machinery. Textile machinery. Exiters. EXTRA HEAVY DUTY Brick machinery, pug mills. Compressors, piston. Crushers: Gyratory, jaw roll. Hoists. Mills: Ball, rod, tube, rubber. Rubber machinery: Calenders, extruders, mills. TYPES OF PRIME MOVER 'Soft' Starts DC electric motors AC electric motors shunt wound star / delta start stepper motors synchronous split wound inverter control I/C engines with 4 or more cylinders. Prime movers with centrifugal clutches or uid couplings. Hours per day duty 10 and Over 10 Over 16 under to 16 AC electric motors DOL start single phase slip ring 'Heavy' Starts DC electric motors series wound compound servo motors

I/C engines with < 4 cylinders Hours per day duty Over 10 to 16

10 and under

Over 16

1.2

1.4

1.6

1.6

1.8

2.0

1.3

1.5

1.7

1.7

1.9

2.1

1.5

1.7

1.9

1.9

2.1

2.3

1.7

1.9

2.1

2.1

2.3

2.5

BELT DIMENSIONS 5M HTD 8MXP & 8M HTD 14MXP & 14M HTD

PULLEYS The three principal dimensions of a pulley are: number of grooves(ange diameter will be greater)

pitch

width

and are used in this order as a designation e.g. 72-8M-50. On the pulley, pitch is the distance between groove centres and is measured on the pulley pitch circle. The pitch circle of the pulley coincides with the pitch line of the belt running in it. The pulley pitch diameter is always greater than its outer diameter. Torque Drive Plus 3 belts run with standard Fenner Taper Lock HTD pulleys. Standard pulley dimensions are listed in the tables on s 102 to 104.

90

Drive Design & Maintenance Manual - 2006

SYNCHRONOUS BELT DRIVES

FENNER HTD This development of the original Timing Drive is offered in a range of pitches 5mm, 8mm and 14mm. Comprehensive choice of belt widths and lengths combine with an optimised range of Taper Lock pulleys to suit general industrial needs. Drives can be designed by simple catalogue selection methods to give more compact drives, less noise and lower bearing loads than with classical Timing Drives. The Fenner HTD drive system conforms to the ISO 13050 standard Fenner HTD drives offer the technical and economical benets of an established product range with proven performance and world wide availability.Design Power (kW)

BELT PITCH SELECTION CHART200

10080 60 50 40 30 20

1

15

&

17 H

m 0m 14

d wi m

s th

mm 8m

108 6 5 4 3 2

TD

H

TD

Fenner HTD belts have a curvlinear tooth form giving a more uniform distribution of shear stresses within the teeth and a transition of tooth loads to the tensile members in the belt which signicantly improves upon classical Timing Belts.

1

5mm (5M) PITCH HTD BELTS9mm WIDE Pitch Length mm 305 325 350 400 450 500 575 640 700 800 890 980 1100 1200 1420 1595 1800 2000 2250 2525 Catalogue Code 278E0030 032 035 040 045 050 057 064 070 080 089 098 110 120 142 159 180 200 225 252 15mm WIDE Catalogue Code 278F0030 032 035 040 045 050 057 064 070 080 089 098 110 120 142 159 180 200 225 252

0.2

0.1

0.08 0.06 0.05 0.04 0.03 0.02

0.01

Rev/Min of Faster Shaft

TEMPERATURE HTD belt performance is generally unaffected in ambient temperatures between 25OC and +100OC. Temperatures beyond these extremes should be referred to your local Authorised Distrbutor. For storage, belts should be protected from moisture, temperature extremes, direct sunlight and high ozone concentrations. Belts should be stored avoiding sharp bends or crimping, which would damage the belts.

8mm (8M) PITCH HTD BELTS20mm WIDE Pitch Length mm 480 560 600 640 720 800 880 960 1040 1120 1200 1280 1440 1600 1760 1800 2000 2400 2600 2800 Catalogue Code 278J0048 0056 0060 0064 0072 0080 0088 0096 0104 0112 0120 0128 0144 0160 0176 0180 0200 0240 0260 0280 30mm WIDE Catalogue Code 278K0048 0056 0060 0064 0072 0080 0088 0096 0104 0112 0120 0128 0144 0160 0176 0180 0200 0240 0260 0280 50mm WIDE Catalogue Code 278L0048 0056 0060 0064 0072 0080 0088 0096 0104 0112 0120 0128 0144 0160 0176 0180 0200 0240 0260 0280 85mm WIDE Catalogue Code 278M0048 0056 0060 0064 0072 0080 0088 0096 0104 0112 0120 0128 0144 0160 0176 0180 0200 0240 0260 0280

14mm (14M) PITCH HTD BELTS40mm WIDE 55mm WIDE 85mm WIDE 115mm WIDE* 170mm WIDE Pitch Length Catalogue Catalogue Catalogue Catalogue Catalogue mm Code Code Code Code Code 966 1190 1400 1610 1778 1890 2100 2310 2450 2590 2800 3150 3500 3850 4326 4578 278N0096 0119 0140 0161 0177 0189 0210 0231 0245 0259 0280 0315 0350 0385 0432 0457 278P0096 0119 0140 0161 0177 0189 0210 0231 0245 0259 0280 0315 0350 0385 0432 0457 278R0096 0119 0140 0161 0177 0189 0210 0231 0245 0259 0280 0315 0350 0385 0432 0457 278S0096 0119 0140 0161 0177 0189 0210 0231 0245 0259 0280 0315 0350 0385 0432 0457 278T0096 0119 0140 0161 0177 0189 0210 0231 0245 0259 0280 0315 0350 0385 0432 0457

Drive Design & Maintenance Manual - 2006

91

10,000

SYNCHRONOUS BELT DRIVES

0.8 0.6 0.5 0.4 0.3

H

TD

5m

m

10

100

20

30 40 50 60 80

200

300 400 500 600 800

1,000

2,000

3,000 4,000 5,000 6,000 8,000

Section

HTD Drives

4

4

SYNCHRONOUS BELT DRIVES

HTD DrivesSELECTION PROCEDURE (a) Speed Ratio Divide the rev/min of the faster shaft by the rev/min of the slower shaft to obtain the speed ratio. (b) Service Factor From the table (page 90) select the service factor which is applicable to the drive. If the drive is speed increasing an additional factor may be required. (c) Design Power Multiply the normal running power (kW) by the service factor. This gives the design power which is used as the basis for selecting the drive. (d) Belt Pitch Refer to the belt pitch selection chart on page 91. Choose the recommended belt pitch according to the point of intersection of the design power and the rev/min of the faster shaft. (e) Pulley Selection Refer to the drive tables (pages 94 to 101) for the pitch of belt selected in (d). From the rst column select the required speed ratio. Reading along the same horizontal line the next two columns give the number of grooves on each pulley. Where more than one combination of pulleys is available consult the power ratings tables (page 93) and the list of stock belt widths (page 91). In conjunction with the design power found in (c) determine the most suitable pulley pair. (f) Centre Distance Using the relevant drive table read along the same horizontal line as that showing the pulley sizes, and select a centre distance nearest to that which is required. The belt required to give this centre distance is shown at the head of the column. (g) Belt Length Correction Factor From the table on page 93 note the correction factor for the pitch and length of belt chosen. (h) Power Rating Refer to the Power Ratings on page 93 for the pitch of belt being considered. Read down the left hand column to the speed of the small pulley in rev/min. On this line read across to the column headed by the number of grooves on the small pulley and note the basic power rating. Multiply this gure by the belt length correction factor (g) to obtain the actual power rating. (j) Belt Width Divide the Design Power found in step (c) by the actual power rating found in step (h) to obtain the belt width factor. Using the table below the power ratings, select a belt width which has a width factor equal to or greater than the gure found above. (k) Pulley Bores Refer to the pulley dimensions (pages 102 to 104) and check that the Taper Lock Bush sizes in the pulleys selected can accommodate the shafts they are to t. (l) Pulley Ranges If standard pulleys are to be used, (i.e. those combinations shown in the selection tables) on the majority of drives it will be found that at least one pulley is anged as standard. If non-standard pulleys are to be used (i.e. combinations not shown in the selection tables) one pulley requires to be anged, and it is usually more economical to ange the smaller one. If the centre distance exceeds 8 times the outside diameter of the small pulley, or if shafts are vertical, both pulleys should be anged. EXAMPLE An HTD drive is required to drive a rotary pump at 685