This is a product with spiral grooves on the inner diameter of the bushing.
There are various applications:
- Wear Debris Countermeasures:
When the shaft and resin bush slide against each other, wear debris is generated and can be expelled through these grooves. Minimal wear debris is produced under light loads, but significant loads invariably generate wear debris. Although these grooves cannot expel all wear debris, they contribute to longer service life compared to bushings without grooves. - Foreign Matter Countermeasures:
In certain environments, foreign matter may enter the system. If this matter enters the gap between the shaft and the sliding bearing, it can cause damage and rotation failure. The grooves aim to drive foreign matter away, preventing damage. - Usage as Oil Grooves:
Plastic bearings can generally be used without grease. However, when used outdoors, if the shaft is made of standard SS material or S45C material, utilizing the grooves as oil channels can prevent rust on the metal shaft. Alternatively, grooves may be intentionally added for lubricants to extend service life. There are also applications where water is continuously run through the grooves instead of lubricants.
Grooves are primarily added to expel foreign matter. They can be designed in spiral patterns, as well as vertical or horizontal grooves.
The photo shows a product made of phenolic material, but thermoplastic resin can also be used.
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