Product category:
Springs, dampers, latches, locks and small components
News Release from: Rencol Tolerance Rings | Subject: Litton/Clifton Precision
Edited by the Engineeringtalk Editorial
Team on 21 May 2002
Tolerance rings give motor specialist an
edge
Litton/Clifton Precision is using tolerance rings to mount high impact, high dielectric moulded brush holders in its motor housings.
The electric motor industry is fiercely competitive and a new idea can give a company an advantage in the market place The US-based manufacturer of small electric motors, Litton/Clifton Precision has found just such an idea in adopting Rencol tolerance rings to mount high impact, high dielectric moulded brush holders, manufactured by Phoenix Electric Manufacturing, in its motor housings
This article was originally published on Engineeringtalk on 18 Aug 2008 at 8.00am (UK)
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Tolerance rings are precision engineered fasteners which are used to join mating cylindrical components economically.
The wave forms around their circumference deflect, allowing the ring to act elastically and give a retention force over the accumulated tolerance range of the mating components without the need for epoxy, glues or setscrews.
Many companies have turned to tolerance rings after years of struggling with the mess and cure time of epoxy or the uncertainty of setscrews.
The tolerance ring avoids the need for these and allows 'one-stop' assembly that retains the brush holder in its axial and radial position and also extends the motor's brush life.
For many of its motors, Litton/Clifton Precision uses a traditional assembly method, which involves a ring with ends which overlap in the free state.
The ends are pulled apart and placed over the brush holder body, allowing for a small gap between the ring ends.
The ring is pushed axially until it rests against the shoulder of the brush holder.
The entire brush holder assembly is then inverted and pressed into the purpose-designed aperture in the motor case.
For one of its new motor designs, the company has opted to use a different type of tolerance ring, which enables it to use a brush holder moulded without a shoulder.
The ring used in this instance has an open gap between the ends in the free state.
During assembly, the ends of the ring are brought together, the ring is placed in the bore of the casing and then moved axially until it rests against a shoulder.
The brush holder is then inserted to the desired depth.
This design offers some advantages in terms of cost savings, as well as ease of assembly, without any decrease in brush life. Request a free brochure from Rencol Tolerance Rings ...
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