Catalog excerpts
Low Speed Backstops FRHD with lever arm in inch dimension, with sprags Application as ➧ Backstop for installations with low speeds. The freewheels are designed for the use in inclined conveyorbelts, elevators or pumps. Taconite seals protect the freewheels from contamination with dust or dirt. Low Speed Backstops FRHD with lever arm are sealed sprag freewheels with ball bearings. They are supplied oil-filled and ready for installation. The Low Speed Backstops FRHD are arranged on through shafts or shaft ends. Nominal torques up to 900 000 lb-ft. Bores up to 21 inch. Application example Motor Backstop FRHD 900 on the head drum shaft of an inclined conveyor belt system. The lever arm is bolted to the freewheel. The backdriving torque is supported by the lever arm on the base plate. When the conveyor belt is without any load, the drum shaft can be turned in both directions during maintenance by removing the bolts. Reduction gear Head pulley Conveyor Belt Mounting The backdriving torque is supported by the lever arm.The lever arm must not be clamped into position. It must have 0,5 inch play in the axial and in the radial direction. The tolerance oft the shaft must be ISO h6 or j6. Example for ordering Freewheel size FRHD 800 with a 3,500 inch bore: • FRHD 800, d = 3,5 inch
Open the catalog to page 149-1 49-2 Standard type For universal use The maximum transmissible torque is 2 times the specified nominal torque.See page 14 for determination of selection torque. Keyway dimensions upon request by customers. • Conversion factors:1 lb-ft = 1,35 Nm, 1 inch = 25,4 mm, 1 lbs = 0,453 kg.
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