Technical Data  Synchronous Belts / Belt Sprockets  Handling

Handling instructions (Lock Belt Sprockets N Type)

Handling instructions

Mounting

  • 1) Wipe off the dirt on the shaft surface and apply a small amount of oil or grease. (Avoid using the oil or grease that contains molybdenum-based antifriction agent. )
  • 2) Because the sleeve, nut, and retaining ring are assembled in the main belt sprocket unit, install it directly onto the shaft. If it is difficult to install, rotate the nut in the loosening direction. It makes installation easier.
    If the product is used after it is stored for over a month, remove the sleeve, wipe off the dust on the circumference of the sleeve, and apply oil or grease. (Avoid using the oil or grease that contains molybdenum-based antifriction agent. )
  • 3) By preventing the rotation of the main belt sprocket unit and tighten the nut manually, the lock belt sprocket can be attached temporarily at the predetermined position on the shaft or at the predetermined phase position.
  • 4) Using a torque wrench, tighten the nut at the specified tightening torque MA (below table).
  • 5) When tightening the nut, be sure to prevent the rotation of the shaft or the main belt sprocket unit. One of the methods for preventing the rotation of the main belt sprocket unit is to create a hole on the outer circumference of the belt sprocket and put a rotation prevention rod into the hole (remove burrs sufficiently after creating the hole )
  • 6) Because the main belt sprocket unit moves 0.2 to 2.0mm in the direction opposite to the nut during tightening, pay attention to the alignment of the belt sprocket, as well as the step on the shaft.

Nut tightening torque MA

Sleeve frame No. Nut width across flats
mm		 Nut tightening torque MA
N・m {kgf・m}
N1 18 18 {1.84}
N2 22 28 {2.86}
N3 30 65 {6.63}
N4 36 100 {10.20}
N5 41 130 {13.27}
N6 46 200 {20.41}

Removal

  • 1) Loosen the nut after confirming that no torque and thrust load are applied to the belt sprocket and shaft.
  • 2) When loosening the nut, be sure to prevent rotation of the shaft and main belt sprocket unit.
  • 3) By loosening the nut, the tightening between the shaft and belt sprocket is released.
Mounting

General precautions

  • 1) When tightening the nuts, be sure to use a torque wrench. Avoid incorrect tightening, such as manual tightening, and jointing pipes, or not only correct transmission torque cannot be obtained but also a problem could occur
  • 2) Operating Temperature Range ：-15℃～80℃(Aluminum ：0℃～50℃)
  • 3) Use the torque wrench properly in accordance with the instruction manual of the torque wrench used.
  • 4) Shaft diameter tolerance and surface roughness: The shaft diameter tolerance and shaft surface roughness shall be h8 and Ra 3.2, respectively.