Two configurations are shown, the Bearing Mount, Type B, used when both halves of the
clutch are mounted on the same shaft, and the Coupling, type C, used as a clutch coupling.
The tooth angle, Figure 1, determines the axial force on the sliding jaw. The tooth angle for
zero engagement force is called the neutral angle and it’s value depends on the radii to the teeth and key, finishes, material and lubrication. If the angle is greater than neutral, about
20 degrees in most cases, there is a disengaging force which must be overcome if the clutch is to stay engaged. For smaller angles, force must be applied to disengage the clutch. Either way, the forces can be substantial and must be delivered thru the sleeve.
The “ Torque Limiting “ tooth has a large enough angle to assure a disengaging force essentially proportional to the torque load thus providing an overload releasing capability thru control of the axial force.
The straight tooth is good when the clutch can be disengaged at rest or unloaded so little concern for sleeve load is required by the designer.
A variety of tooth forms can be provided a few of which are shown below. The symmetrical form is inexpensive and the most versatile. At higher relative speeds of engagement the saw tooth will allow the teeth to enter farther during the shift time but has different tooth angles in each rotation direction. In the case of unidirectional drive this may be of no consequence. The interrupted tooth allows for either a symmetrical form as shown or can be a sawtooth and will allow time for a full depth engagement prior to pickup. If the speed of engagement is low the idle time till pickup is greater.
See a basic tooth clutch, click here!
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