TSUBAKI EMERSON CAM CLUTCH
TSUBAKI EMERSON CAM CLUTCH
TSUBAKI EMERSON CAM CLUTCH
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www.bergab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс (495) 223-3071<br />
■ LIFE OF BR SERIES <strong>CAM</strong> <strong>CLUTCH</strong><br />
The service life of previous <strong>TSUBAKI</strong> Cam Clutch was<br />
determined as the frictional service life during<br />
freerunning (clutch disengaged) and the fatigue service<br />
life of the engaged clutch. However, with the new BR<br />
Series, freerunning frictional service life is not a factor<br />
because there is no mechanical contact when the clutch<br />
is disengaged. As a result, service life is determined<br />
solely by the fatigue life of the engaged clutch.<br />
Free-running r/min.<br />
0<br />
Non-contact range<br />
Contact time<br />
Free-running time<br />
(a) Contact time<br />
Non-contact time<br />
(b) Contact time<br />
Friction in the clutch mechanism only occurs during a very short<br />
period of time denoted by “a” and “b”. “a” is the time during which the<br />
cam is engaged until the acceleration of inner race causes it to<br />
disengage. “b” is the time during which the cam engages when the<br />
inner race decelerates.<br />
Fatigue Service Life<br />
Compression stress is generated when the cam is engaged<br />
against the inner and outer races. While the points at which the<br />
engagement compression are applied are not specifically<br />
determined, they will generally remain constant. As a result,<br />
torque loads repeatedly applied to the clutch will eventually<br />
result in pitting of the contact surfaces. Refer to the fatigue<br />
service life graph to determine the service life of the Cam Clutch<br />
in relation to clutch engagement cycles and applied load.<br />
Note: In cases where the load applied to the Cam Clutch<br />
changes, or where vibrational loads are encountered,<br />
repeated torque loads can be applied during a single<br />
clutch engagement. The Variable Load Torque Graph<br />
shows the type of repetitive torque loads which can<br />
be applied to the Cam Clutch in these cases.<br />
Repeated torque loads during a single clutch<br />
engagement can have the effect of increasing the<br />
overall torque load, and this must also be considered<br />
when determining Cam Clutch service life.<br />
Fatigue Service Life Graph<br />
The Fatigue Service Life Graph at right pertains the BR<br />
series Cam Clutch. The horizontal axis denotes the clutch<br />
engagement cycles, and the vertical axis the applied<br />
torque percentage of the maximum rated load of the Cam<br />
Clutch. (100% refers to the maximum rated load). The<br />
service life of the Cam Clutch is determined by<br />
comparing the clutch engagement frequency to the load<br />
applied as a percentage of maximum load.<br />
Variable Load Torque Graph<br />
Fatigue Service Life Graph<br />
Example: Cam Clutch type....................BR40<br />
Maximum rated load..............................980 Nm<br />
Applied torque ......................................588 Nm<br />
Torque percentage ................................60%<br />
Clutch engagement cycles ..................approx. 1,600,000<br />
In the above example, if a repetitive torque load were<br />
applied 10 times for each clutch engagement, the fatigue<br />
service life would reduced to 160,000 cycles.<br />
www.bergab.ru Берг АБ bergab@ya.ru Тел. 83 (495)-228-06-21, факс (495) 223-3071
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