Transmission programme JOYRO Transmission programme JOYRO Pulleys Flexible couplings TB pulleys (solid)

Agenda • History & Facts • Range & sizes • Pulley programme • Function • Term • Taper Bush • REC V – Belts • Dimensions / tolerances • Catalogue – JOYRO Pulleys Advantages • Weight reduction • Design • Startup Energy • Small Tension • Increased speed • Reduced belt temperature • Balancing • Samples • Features of the JOYRO Pulley

History - facts History : 2007 JOYRO Pulley design. 2008 Prototypes and load tests. 2009 First JOYRO Pulley on the market. 2010 - 2011 Additional tests : Temperature, wear, noise …etc. 2012 Produced by Joy and Happiness ., LTD. Today : • Main applications : • Compressors, • Ventilating plants / Air conditioning, • Paper mills, • Agriculture…etc. • Main Customers : Samsung Electronics, Samsung Techwin, LG Chemical, LG Display, LG Electronics, SKC, Hyundai Motor Group, Kia Motor Group, …etc.

Range & sizes JOYRO® Pulley SG Iron FCD 500 SPZ, SPA, SPB, SPC - Diam 140 - 1250 mm Traditional Pulley Grey Iron FC 25 SPZ, SPA, SPB, SPC - Diam 50 - 236 mm

Pulley programme Grooves Rim Arms/spokes Hub Shaft Bush Screws

Function Terms ISO 4183

Taper Bush Taper Bushes >>

REC Type V-belts JOYRO Pulley

Dimensions/tolerances

Catalogue - Pulleys

Advantages

Weight reduction Weight reduction 40-50 % Table 1 Pulleys reduced from more than 40kg to less than 40kg Table 1

Design Example Traditional SPB 450-8 / JOYRO SPB 450-8

Startup energy Traditional SPB 400*8 JOYRO SPB 400*8

Smaller tension in arms Because of the tangential connection between arms and hub the tensile stress in the arms will be reduced as the hub is able to rotate fractions of degrees during the cooling period after casting.

Increased speed double speed is double power!! Increased speed (test) Setup: 5 kW motor (n1 = 3000 rpm) Frequency changer SPA 200-2, SPA 100-2 SPB 355-4 The SPB 355-4 mountet as shown with no belts, and the rotational speed n2 is increased to 7400 min -1 ~138 m/s. No damage on pulley, and further tests were not found expedient. d3 = SPB 355-4 d1 = SPA 200-2 D2 = SPA 100-2

Reduced belt temperature Thermal imaging camera shooting Traditional SPB 250-4 (After 2 working hours) JOYRO SPB 250-4 (After 2 working hours)

Correlation between the belt and the temperature Every 10°C reduced belt temperature =Double life length!!

Balancing Standard balancing grade (ISO 1940) : G16 (30m/s) Static / Dynamic balancing (ISO 254) : 1,58 x 1011 Dm x B n = v x 60 Dm x 10 x -3 n = n < n : Static balancing 1 n > n : Dynamic balancing Special demands regarding balancing can be arranged!

Transferring high power at high revolutions (Compressor customer) Alt.: 1 Transmission with regular v-belt pulleys n1 = 1500 min-1 P1 = 200kw d1 = SPB 450-8 Required output: P = 200 kw , nw = 8000 min-1, Solution: n1 = 1500 min-1 d1 = 450 mm nw = 8000 min-1 pw = 200kw n2 = nw/4 = 2000 min-1 (Gearbox) n1 = d2/d1 x 2000 min-1 d2 = n1/n2 xd1 = 335 mm Belt speed: V = d1 x n1 x p /60 = 0,45 x 1500 x p/60 = 35 m/s n2 = 2000 min-1 d2 = SPB 335-8 Gearbox required!

Transferring high power at high revolutions (Compressor customer) Alt.: 2 Transmission with VTP/SG Iron pulleys n1 = 3000 min-1 P1 = 200kw d1 = SPA 450-10 P = 200 kw , nw = 8000 min-1, P1 = 200 kw , n1 = 3000 min-1, d1 = 0,45 m dw = n1/nw x d1 = 170 mm nw = 8000 min-1 pw = 200kw Belt speed: V = d1 x n1 x p /60 = 0,45 x 3000 x p/60 = 70 m/s n2 = 8000 min-1 d2 = SPA 170-10 Gearbox eliminated!!

Features of the JOYRO Pulley