March 19, 2018
Dr. Michael Kim from GGB to teach online SAE Course covering
GGB’s Principal Engineer for Tribological Materials, Dr. Michael Kim is teaching an online SAE...
From July 16, 2018 to July 22, 2018
Visit us at hall 2, stand # 2030
From September 18, 2018 to September 20, 2018
CTI Symposium China
Visit us at booth 17
Get in touch with our experts
Oil & Gas
Increase Service Life
Replace Roller Bearings
Reduce Size / Weight
Engineered Plastics Bearings
Fiber Reinforced Composite Bearings
Bushing Blocks and Thrust Plates
Metal and Bimetal Bearings
AT A GLANCE
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 bushings are fitted at the top and bottom of the rotating pinion, providing low friction bearing 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 bearing performance, other benefits of metal-polymer DP4 bushings are:
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