May 21, 2019
GGB’s New Aerospace Solutions Take Off at the Paris Air Show
Fly High with New Technology.
GGB is gearing up for the 53rd International Paris Air Show, June...
PyroSlideTM 1100 Webinar:
Discover How to Beat the Heat with GGB’s New High Temperature Powder Metal Bearing Solution
Hydro White Paper:
GGB Composite Bearing Design with Improved Tribology and Machinability for Aggressive Applications
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The external arm of a door closer is fixed to a geared pinion that rotates around itself, moving a worm gear that compresses a spring as the door is opened. When the door is released, the spring returns to its original uncompressed state, thereby enabling the door to close automatically.
If the door is opened by 90 degrees, the pinion goes through 140 degrees of rotation and another 140 degrees when it is closed.
DP4 lead-free, metal-polymer composite bushings are fitted at the top and bottom of the rotating pinion, providing low friction performance and ensure an easy and noise-free operation.
The structure of the bushings consists of a rigid steel backing to which is bonded a porous bronze sinter interlayer, impregnated and overlaid with a PTFE bushing layer with wear-resistant fillers.
In addition to the excellent low friction performance, other benefits of metal-polymer DP4 bushings are:
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