MECHANICAL POWER TAKE OFF SELECTION GUIDE

an excellence in engineering www.jbj.co.uk/mechanical-power-conversion.html Mechanical Power Take-Off Units Standard Easy-to-mount unit features clutch assembly with shaft and bearings in rigid cast iron housing. Designed for manual operation on all internal combustion engines with standard SAE flywheel housing from No. 6 to No. 00. • Single-plate 6.5 to 14 SAE • Double-plate 11.5 to 18 SAE • Triple-plate 14 to 21 SAE • Capacities to 1454 kW (1950 hp), torque to 11,389 Nm (8400 lb-ft) Limited Attendance To meet the oil field pumping requirement for a power take-off that can operate continuously...

Mechanical Power Take-Off Units Special Units Selection Process Ordering Codes Duty Classification Models Allowable Side Loads for Standard Mechanical Power Take-Off Units Standard Mechanical Power Take-off Units Dimensions Standard Mechanical Power Take-off Units Dynamically-balanced Driving Rings jbj Techniques product list, #DriveLineHarmony

Mechanical Power Take-Off Units Power take-offs (PTOs) are used as a standard method for transmitting the power of engines in a great variety of industrial applications such as air IB Type Power Take-off compressors, agricultural machinery, crushers, road building machinery, cranes, shovels, pump drives and oil field service. A power take-off consists of a Ventilated Center Plates and Drive Ring complete clutch assembly with shaft and bearings mounted in a cast-iron Forged Steel Levers Centrifugal Assisted Release housing for easy engine installation. Twin Disc offers power take-offs for all industrial...

Mechanical Power Take-Off Units Special Units Special power take-offs are available. These include the innovative straddle bearing concept and a limited-attendance PTO that contains a positive throw-out collar clearance mechanism and extended lubrication intervals. For original equipment manufacturers, special power take-off units can be designed to meet individual requirements when sufficient volume is indicated. Design variations can range from minor changes to entirely new concepts. Straddle Bearing Power Take-Off » SP & PO Models. » High side-load applications. » No pilot bearing. » SAE 14 & SAE...

Mechanical Power Take-Off Units Selection Process How To Choose The Appropriate PTO Several factors must be considered in the selection process in addition to duty service, such as: SPEED LIMITS • SIDE-LOAD LIMITS • CLUTCH TORQUE LIMITS The selections are usual dry clutch disconnect type applications where engagements are infrequent and are at low (idle) input speed. Once engaged operation continues for one hour or more, engaging the clutch at higher input speed will reduce component life. Refer to the following duty classifications and examples. Application Data*: SAE Housing Size Input Power...

Mechanical Power Take-Off Units Ordering Codes 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%...

Mechanical Power Take-Off Units Duty Classification Duty Class I: The clutch is used for disconnecting the power from the load. When engaging, so little work is done that the clutch shows no temperature increase at the 2. Hydraulic pumps (without pre-charge) pressure plate outer surface. Use maximum input torque from the Class I Table, disregard 3. Feeders – disc type kW. The mechanism is operated one or more hours before disconnecting. 4. Agitators – pure liquids Examples: Engagement of clutches with the driven equipment having inertia less than that of the clutch and whose torque demand curve...

TWIN DISC 2. kW and torque ratings may be increased by specifying optional sintered iron-type clutch plates. Available SAE 8 through SAE 21 sizes. 3. Sintered iron clutch plates with ventilated-type centre plates are standard in IBF-314, IBF-318 and IBF-321 PTO units. These plates should not be used in applications where torsion or vibrations are prevalent. Consult jbj Techniques technical office, telephone: +44 (0)1737 767493 or email: [email protected] 4. Compound drives and power-engaged PTO applications require written factory review for warranty to apply. 5. Nodular Iron. General information...

TWIN DISC PTO Model and Drawing Numbers ‘X’ Distance in mm (inches) The following general formula should be used for determining the actual applied load. Actual Applied Load kg (lbs) Shaft Speed (RPM) Pitch Diameter mm (in) of Pulley, etc. Load Factor 1.0 for Chain or Gear Drive 1.5 for Timing Belts 2.5 for All V Belts 3.5 for Flat Belts 2.1 for Reciprocating Compressors and other Severe Shock Drives and 1.8 for large inertia type drive (crushers, chippers, planers). Compound drives and power engaged power take-off applications must have written factory review.

TWIN DISC PTO Model and Drawing Numbers

TWIN DISC Dimensional Data, dimensions in mm (inches)

TWIN DISC USE A CERTIFIED PRINT FOR INSTALLATION NOTE: PTO models with OP designation have oil-lubricated main bearings. All other models have grease-lubricated main bearings. IMPORTANT NOTICE 1. A support plate for one-plate SAE 14 and smaller PTOs (except SP-311P) is not required. 2. A support plate for three-plate SAE 11.5 and two- and three-plate SAE 14 PTOs is required in side-load applications and is recommended for in-line applications. 3. A support plate for SAE 18 and larger PTOs is required for both side-load and in-line applications. Dimensions of these industrial PTOs with drive ring...