How to select the joints with needle-roller bearings

NOMOGRAM FOR JOINTS WITH NEEDLE-ROLLER BEARINGS

The joints with needle-roller bearings can to be used till diameter 32, with an angle of 6° till 6000 rpm. For diameters > 32 till 3000 rpm. The max working angle by low speed can to be 45° for a joint.

HOW TO SELECT THE JOINTS WITH NEEDLE-ROLLER BEARINGS

Check the tourque:

formula-rullini

N = power in Hp and n = rpm.
*(N.B. 1 CV = 0,735 KW)
The nomogram shows in abscissa the values of β x n (deflection angle in degrees for revolutions for minute) and on the ordinate the value of the maximal dynamic load of the joint (Nm), smaller than the statical load in the table. working angle β x n and we have the point of intersection between the abscissa β x n and the ordinate Mt (in Nm). Select the joint size, which is over the determined point and this is the first selection considering the real working conditions. The needle-roller bearings are used in applications for tools machines, multi-spindle drilling machines, textile, parcelling and packing machines. When more joints must be installed one to each other by a reduced distance, or in applications of high or medium speed where the cardan-shaft cannot to be lubricated at regular intervals.

nomogramma_rullini
Octis

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