SECTION : 5
SHAFT COUPLINGS
HRC™ Couplings
HRC Couplings These semi-elastic flexible couplings are designed for general purpose use and permit quick and easy assembly by means of Taper Lock bush fixing. Their characteristics are designed for use particulary on machinery driven from standard IEC electric motors. Fully machined outside diameters allow alignment by simple straight edge methods. Shaft connection is "fail safe" due to interacting dog design.
SELECTION
(d) Bore Size
(b) Design Power
(a) Service Factor
From Dimensions table on page 117 check that the required bores can be accommodated.
Design power 70 x 2.5=175kW.
EXAMPLE
Readingacrossfrom1200rev/mininthespeedcolumn of Power Ratings table below, 251kW is the first power toexceedtherequired175kW(designpower).Thesizeof the coupling at the head of this column is 230.
Determine appropriate Service Factor from table below (b) Design Power Multiplyrunningpowerofdrivenmachinerybytheservice factor. This gives the design power which is used as a basis for coupling selection. (c) Coupling Size RefertoPowerRatingstablebelowandreadacrossfrom theappropriatespeeduntilapowerequaltoorgreater than the design power is found.The size of coupling is given at the head of that column.
Ashaftcouplingisrequiredtotransmit70kWbetween a1200rev/mindieselengineandahoistrunningover 16hrs/day. Engine shaft is 70mm and the hoist shaft is 75mm.
(c) Coupling Size
(d) Bore Size TheDimensionstable(page117)showsthatbothshaft diameters are within the bore range available.
(a) Service Factor The appropriate service factor is 2.5.
SERVICE FACTORS Special Cases For applications where substantial shock, vibration and torque fluctuation occur, and for reciprocating machines e.g. internal combustion engines, piston type pumps and compressors, refer to your local Authorised Distributor. with full machine details for torsional analysis.
Electric motors Steam turbines
Type of Driving Unit Internal combustion engines Steam engines Water turbines Hours per Day Duty over 8 o 16 over over 16 8 and under inclusive 16
8 and under
over 8 to 16 inclusive
UNIFORM Agitators, Brewing machinery, Centrifugal blowers, Centrifugal compressors†, Conveyors, Centrifugal fans and pumps, Generators, Sewage disposal equipment.
1.00
1.12
1.25
1.25
1.40
1.60
MODERATE SHOCK* Clay working machinery, Crane hoists, Laundry machinery, Wood working machinery, Machine tools, Rotary mills, Paper mill machinery, Textile machinery, Non-unifomly loaded centrifugal pumps.
1.60
1.80
2.00
2.00
2.24
2.50
HEAVY SHOCK* Reciprocating conveyors, Crushers, Shakers, Metal mills, Rubber machinery (Banbury mixers and mills), Reciprocating compressors, Welding sets.
2.50
2.80
3.12
3.12
3.55
4.00
Driven Machine Class
* it is reccommended that keys (with top clearance if inTaper Lock bushes) are fitted for applications where load fluctuation is expected † For centrifugal compressors multiply Service Factor by an additional 1
POWER RATINGS (KW) Speed rev/min 100 200 400 600 720 800 960 1200 1440 1600 1800 2000 2200 2400 2600 2880 3000 3600 Nominal Torque (Nm) Max Torque (Nm)
Coupling Size 130 150 3.30 6.28 6.60 12.60 13.20 25.10 19.80 37.70 23.80 45.20 26.40 50.30 31.70 60.30 39.60 75.40 47.50 90.50 52.80 101.00 59.40 113.00 66.00 126.00 72.60 138.00 79.20 151.00 85.80 163.00 95.00 181.00 99.00 188.00 118.00 226.00
70 0.33 0.66 1.32 1.98 2.37 2.64 3.17 3.96 4.75 5.28 5.94 6.60 7.26 7.92 8.58 9.50 9.90 11.90
90 0.84 1.68 3.35 5.03 6.03 6.70 8.04 10.10 12.10 13.40 15.10 16.80 18.40 20.10 21.80 24.10 25.10 30.10
110 1.68 3.35 6.70 10.10 12.10 13.40 16.10 20.10 24.10 26.80 30.20 33.50 36.90 40.20 43.60 48.30 50.30 60.30
31.5
80
160
315
72
180
360
720
180 9.95 19.90 39.80 59.70 71.60 79.60 95.50 119.00 143.00 159.00 179.00 199.00 219.00 239.00 259.00 286.00 298.00
230 20.90 41.90 83.80 126.00 151.00 168.00 201.00 251.00 302.00 335.00 377.00 419.00 461.00 503.00 545.00
280 33.00 65.00 132.00 198.00 238.00 264.00 317.00 396.00 475.00 528.00 594.00 660.00 726.00
600
950
2000
3150
1500
2350
5000
7200
Fire Resistant/Anti-Static (FRAS) inserts available ex-stock. For speeds below 100 rev/min, and intermediate speeds, use nominal torque ratings. * Maximum couplingspeedsarecalculatedusingan allowableperipheral speedfor thehubmaterial.For selectionof smaller sizeswithspeedsinexcessof 3600rev/min–Consultyour local Authorised Distributor.
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