Robot Mechanisms and Mechanical Devices Illustrated - Profe Saul

Chapter 3 Direct Power Transfer Devices 123
Figure 3-48 Springs inside the
block grip the shaft because they
are distorted when the gear is
mounted to the box on the shaft.
Figure 3-49 The ring resists the
natural tendency of the rollers to
jump out of the grooves in the
reduced end of one shaft. The
slotted end of the hollow shaft
acts as a cage.
Figure 3-50 Sliding wedges
clamp down on the flattened end
of the shaft. They spread apart
when torque becomes excessive.
The strength of the springs in
tension that hold the wedges
together sets the torque limit.