DANA
Commercial Drive Shafts Catalogue
| Drive Shafts | |
|
|
| Installation and Maintenance | ||
| tt back to Table of contents | ||
| Load
on connection bearings The bearings of the driving and the driven shafts are strained by statle and dynamic forces and moments. These bearing forces result from: Static bad due to  the weight of the universal shaft the length compensation under torque the torque deviation in case of deflected
universal shaftsDynamic bad due to the remaining unbalance of the shafts the aperiodical length compensation (axle
movement) under torque the torque deviation in case of rotating,
deflected shafts and centrifugal forces in case of untrue running
of the connected unitsBearing forces due to torque deviation The torque equation for a deflected joint is:  (See "General fundamental theory ") If the transmitted power (N) is taken as constant (no friction losses), the torque relation can also be es follows:    The extremes of the transmission i are:  Thus also:  Bearing forces due to Iengh alteration 
  With a constant drive capacity resp. with a constant drive torque  and a constant angular drive
velocity  an irregular torque behaviour is
obtained in the drive. Since the torque is only
transmitted in the journal cross plane, the cross,
however, has a horizontal position with regard to the
drive shaft at one moment and a vertical position with
regard to the driven shaft at another moment, depending
on the position of the yoke, there is, in the former
case, a bending torque
 on the yoke of the driven shaft and, in the
latter case, a bending torque
 on the yoke of the driving shaft. Thus the driven torque  fluctuates twice per rotation between the
extreme values / cos β and
* cos β = 0°; 180°
 = 90°; 270°
 The universal shaft with two joints in the Z-arrangement shown is Ioaded with the following moments. Here, as for the single joint, only the two extreme positions are shown.  = 90°; 270° =
   = 0°; 180° =
  In general:  Radial forces on connecting bearings For universal shafts with two joints mounted normally while observing the installation instructions it is usually enough to know the greatest reaction forces in the bearings of the driving and driven shafts, which occur two times per rotation. The following calculation scheme may be helpful. (See "Calculation scheme") Axial forces on connecting bearings Axial forces on connecting bearings are encountered in the form of reaction forces due to: displacement of the engine / transmission
and / or transfer box units axle displacementsThese axial forces are a function of: the amounts of torque to be transmitted the sectional dimensions of Ion gitudinal
compensating elements the friction coefficient in Ion gitudinal
compensating elements the deflection angles of the cardan shaft
under operating conditions the relative dynamic displacement of engine
and transmission units additional loads due to hydraulic effects
arising when the grease 
chamber in the Ion gitudinal displacement system is
filled beyond capacity |
||
| tt back to Table of contents | ||
| Email : info@landmark-autoparts.com | Websites |
|