Mechanical Power Take-Off Units Ordering Codes 4 #DriveLineHarmony PTO Sizing Example – Select The Proper Twin Disc PTO For This Application A disconnect PTO is required to drive a rotary screw compressor which is a Duty Class III application. The prime mover is a diesel engine rated for 149.14 kW (200 hp) @ 2,000 rpm. The engine has a SAE #2 flywheel housing and SAE 11.5" flywheel with a 72 mm pilot bearing bore. The pulley pitch diameter mounted to the PTO shaft will be 330.2mm (13") and "V" belts are used for power transmission. The centre-line of the load imposed "X" dimension will be 101.6 mm (4"). Assume 5% parasitic losses from the engine for this specific application. 1. Determine the NET power to the clutch (assume 5% parasitic losses.) 149.14 kW (200 hp) gross x 0.95 = 141.67 kW (190 hp) NET 2. Calculate the imposed side-load utilizing the following formula: (metric) L = 1945010 x kW x F x LF N x D L = Actual Applied Load, kg (lbs) F = Load Factor N = Shaft Speed (rpm) 1.0 for Chain/Gear Drive D = Pulley Pitch Diameter mm (in) 1.5 for Timing Belts LF = 2.1 for reciprocating compressors and inertia type drives 2.5 for All V Belts other severe shock drives and 1.8 for large (crushers, chippers, planers...) 3.5 for Flat Belts L = 1945010 x 141.67 kW x 2.5 = 1043 kg 2,000 rpm x 330.2 3. Use the following data and compare to the PTO rating and allowable side-load tables: » 141.67 kW (190 hp) NET to clutch » 1043 kg (2,302 lbs) of side-load » SAE 11.5" flywheel » 2,000 rpm PTO shaft speed » SAE 2 housing The SP311P has a Class III rating of 184.188 kW (247 hp) and max speed rating of 3,000 rpm with nodular iron drive rings. The application requires 141.67 kW (190 hp) into the clutch @ 2,000 rpm, which are within the limits of the SP311P. The side-load required for the application is 1043 kg (2,302 lbs) at an "X" dimension of 101.6 mm (4"). The side-load capacity of the SP311P at an "X" dimension of 101.6 mm (4") for any rpm is 1233.771 kg (2,720 lbs). The application side-load of 1043 kg (2,302 lbs) @ 101.6 mm (4") is within the capacity of the SP311P. The SP311P is acceptable for this application and is available with a 72mm pilot bearing. Ordering Code SP 3 11 P 2 XX BOM number SAE housing; SAE 0, 1, 2, 3, etc. Output Configuration P - Standard HP - Heavy duty SP - Special OP - Oil lubricated SB - Straddle Bearing IL - Inline Clutch size; SAE 10, 11.5, 14, etc. Number of clutch plates; 1, 2 or 3. Output Configuration C - Positive over-centre clutch suitable for power transmission applications. CA - Positive over-centre for inline irrigation applications. IBF - Inverted lever action clutch. SP - Counter balanced toggle action over-centre clutch. www.jbj.co.uk/mechanical-power-conversion.html (imperial) L= 126,000 x HP x F x LF N x D L = 126,000 x 190 hp x 2.5 = 2,302 lbs 2,000 rpm x 13"
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