Tolerance rings created to handle torque overload
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Rencol Tolerance Rings product story
Edited by the Engineeringtalk editorial team
Oct 9, 2008
Saint-Gobain Performance Plastics Rencol has created tolerance rings to handle torque overload conditions in power tools.
Power tools, such as drills, saws and hedge trimmers need torque overload protection to prevent the motor from stalling when an overload condition or jam occurs.
This helps eliminate the possibility of the motor burning out and prevents damage to the drill bit, if it's a power drill, and drive gears.
Overload protection ensures the lifetime of the power tool.
Conventional methods of protecting the motor, gear teeth and other drive components during a torque overload condition can be expensive and complicated.
Tolerance rings are light, inexpensive, compact and easy to use.
They are radially sprung steel rings designed to be press fitted between two mating annular components to create an interference fit.
The rings can provide either a rigid joint, such as for a stator mount in an electric motor, or to slip at a pre-determined torque level: from 100Nm down to 2Nm.
The tolerance ring is inserted between the gear and the hub to create an interference fit.
Since the parts are rigidly connected through the ring, a zero backlash system is achieved.
At a pre-determined torque level, when the load reaches a point at which damage would otherwise occur, the tolerance ring will flex and slip.
As soon as the overload condition is removed, the interference fit is re-established, allowing the power tool to continue normal operation.
With this design, overload can occur many times: up to 1000, 360-degree slips can be accommodated without adversely affecting operation.
Apart from torque overload, tolerance rings can be used in bearing retention in as-cast, as-pressed or as-moulded housings, eliminating the close tolerance machining of the bearing bore.
Tolerance rings can also be implemented to compensate for differential thermal expansion in dissimilar materials, for example in alloy or plastic housings and can also tolerate high levels of vibration.
Operational speeds in excess of 20,000rpm and temperatures up to 150C can be readily accommodated with no loss of bearing retention.
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Contact Rencol Tolerance Rings
Tel +44 117 938 1700
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