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  • Flexibility and suitability
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  • a wide range of profiles
    a wide range of profiles for telescopic tubes...to make the difference

Transmittable nominal torque

The theoretical lifetime of the drive shaft normally matches the life of the bearings of the cross and can be calculated based on the following nomograms for the different products’ families according to three parameters:

• Average working torque (or power)
• PTO rotation speed
• Spindle angle

The nomogram is used to determine both the theoretical duration of a specific driveshaft  in certain working conditions, both the size of a driveshaft that meets the requirements of durability required.
It is important to point out  that the data derived from the nomogram are only intended to provide an indication for the choice of the size of the drive shaft and / or for the verification of its performance.

Here below we report the 4 nomograms of the four different families of driveshafts:

  • TX, RX
  • AX, BX, MX, ME, UE, XE, TQ, MT, UT, XT
  • YE, YF, MY, UY, XY, SQ, MS, US, XS
  • YP (PLUS)

The nomogram can be read in two different ways:

  1. Knowing the characteristics of duration, spindle angle, speed and torque transmitted relating to a given application, the nomogram is used to determine the size the driveshaft must be for that specific application. Starting from a value of the column on the left (L) on the theoretical life of the driveshaft, by drawing a segment that passes through the value of the joint (α) and ending column "S2". From the point identified draw a new segment that crosses through the column value "n" (number of turns) until you reach the column "S1". Finally draw a last segment that passes through a specific torque value present on the column "M" until reaching the column "D". The correct size for the specific application of the driveshaft corresponds to the first size reported below the point reached on the column "D".
  1. Knowing the size of the PTO shaft, the nomogram allows to determine its theoretical duration as a function of the torque transmitted, the number of revolutions and the spindle angle relative to a particular application. Starting from the values in the column "D" relative to the size of the driveshaft, make the same procedure as explained  in example 1) passing per specific values of speed and spindle angle, up to determine the corresponding point on the column "L" identifying the potential duration of that specific drive shaft.

NOMOGRAMS OF DURATION FOR FAMILY PRODUCTS TX, RX
NOMOGRAMS OF DURATION FOR FAMILY PRODUCTS AX, BX, MX, ME, UE, XE, TQ, MT, UT, XT

 

 

 

 

 

 

If the hitch of the machines is not equidistant between the two PTOs, the two angles α1 and α2 are not equal , therefore in the theoretical calculation of the average length of the driveshaft, you must use the value for angle greater of the two, namely α1 / 2 in the case of fig.8.


This is true only for the drive shafts with double homokinetic  joints where the overall transmission is homokinetic. On the contrary, for all other driveshafts with one  simple joint and one homokinetic one (fig.10), the parameter α that should be used for the estimation of the theoretical average duration is related to the standard joint if its spindle angle is greater than half than that of the homokinetic joint (α4> α3 / 2) or, vice versa, the half of the angle of the spindle angle relative to the homokinetic joint, if it is greater than the one of the standard joint (α3 / 2> α4). 

 

 

 

 NOMOGRAMS OF DURATION FOR FAMILY PRODUCTS YE, YF, MY, UY, XY, SQ, MS, US, XS
NOMOGRAMS OF DURATION FOR FAMILY PRODUCTS Yp
NOMOGRAM FOR POWER, SPEED AND TORQUE  CALCULATION