The specific benefits offered by the RENCOL® tolerance ring soon mount up to a significant commercial savings, especially when margins available to OEM manufacturers are under intense pressure to produce products at lower and lower prices. The table below shows how each benefit offered by the RENCOL® tolerance ring manifests itself in real commercial savings to the manufacturer.
RENCOL® Tolerance Ring Products
Technology Drives All Types of Electric Motors
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Non-Automotive Motors
Automotive Motors
Benefits
Competing Solutions
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These motors run continuously for long periods under load and can generate high levels of heat. Furthermore, they have to be as light as possible so designers often use light weight alloys and plastics components, even though this can result in differential thermal expansion problems. RENCOL® tolerance rings offer the ideal solution to thermal expansion problems as they provide a constant retention force over a wide temperature range and do not require a heavy interference fit that can distort the bearing race.
For cost reasons, a plain bearing is often used on the commutator end of the motor. Unfortunately, this type of bearing can not cope with angular misalignment of the motor shaft so is unsuitable for many applications. However, if a RENCOL® tolerance ring is used to retain the bearing, the assembly can then cope with misalignment of the motor shaft and provide long bearing life.
Commutator Brushes
Eliminate set screw and risk of cracking or loosening under vibration. Avoids use of glue and the associated production costs.
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Throttle Body Motor Mount
RENCOL® tolerance ring to mount a motor without causing damage to the motor while providing stability during its operating environment.
Starter Motor
RENCOL® tolerance ring to mount a gear, the ring provides simple overload protection in the event of a misfire.
Wiper Motor Bearing Mount
RENCOL® tolerance ring used to mount a bearing / bush in the motor system.
Alternator
RENCOL® tolerance ring used to mount a bearing in the cast housing. This is an excellent mounting solution and competes against alternative technologies of plastic / rubber boots and glue.
Air Emission Fan Mount
RENCOL® tolerance ring to mount a plastic impellor to a steel shaft. This provides sufficient torque to drive the impellor at operating temperatures.
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Benefits | Savings |
| Relaxed machining tolerances of mating components | Reduction or even elimination of secondary ‘finishing’ operations reduces machining costs, production time and opportunity for quality rejects. |
| Compensation of angular shaft alignment of rotating shafts | Increases appliance / motor lifetime and reliability therefore reducing risk of warranty failures. |
| Allows and controls radial movement of ‘floating’ bearings inside electric motor housings | Reduces radial stresses being transmitted from the inner to the outer race of the bearing during thermal expansion of the shaft. This reduction of stresses in the bearing increases the lifetime of the bearing and therefore the motor. |
| Reduction of radial forces exerted on outer raceof bearing | Reduction of radial loads on outer race of bearing reduces the stress exerted on the rolling elements of the bearing and therefore increases the bearing lifetime. |
| Allows for stiffening of assembly | The ability of the tolerance ring to stiffen any moving assembly allows the design engineer to reduce vibration to a minimum. This reduction in vibration reduces in-service noise levels and also increases product lifetime. |
| In line torque overload protection | Protect motors from burnout conditions in the event of a blockage. Also protects equipment users from potentially harmful injuries. |
| Compensation of thermal expansion rates in dissimilar materials | The use of high expansion housing materials linked to strong drive or bearing materials means that in high-temperature range environments the design engineer risks assembly failure. RENCOL® tolerance rings spring characteristics compensate for this expansion differential and therefore reduces potential assembly failures. |
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» For more details or information on how we can help you with product solutions in electric motor applications, please visit Sales and Support for regional contact information, or Contact Us directly with your enquiry.