Agri Disc Hubs
Des Produits sur mesure et éprouvés sur le terrain
Herses à disques, semoirs, applications de labour en bandes. La gamme « Agri Disc Hub » de NSK comprend des unités de roulements pour moyeux de disque qui répondent idéalement à vos besoins. En fonction du type d’unité de roulement utilisé, les produits Agri Disc Hub sont prévus pour des diamètres de disque de 300 à 800 mm.
NSK propose des solutions « sur mesure » où des éléments, tels que l’arbre ou le logement, peuvent être adaptés aux exigences spécifiques du client. Nul besoin de recourir à des essais sur le terrain coûteux en temps, dans la mesure où nos conceptions mettent systématiquement en œuvre des composants de base très largement testés et éprouvés, comme les joints d’étanchéité et les roulements.
Simple Assembly
When installing the Agri Disc Hub on the machine arm, please ensure that the specified tightening torque is always used in order to correctly preload the bearing and ensure there is no free play present.
- AHU20 = 135 Nm
- AHU28 = 350 Nm
- AHU30 = 350 Nm
- AHU34 = 350 Nm
- AHU44 = 400 Nm
- For hollow machine arms a higher tightening torque may be required.
- We would be pleased to advise you: info-uk@nsk.com.
- When mounting the Agri Disc Hub on the machine, use locknuts and lock washers to prevent it coming loose due to vibration.
- During assembly ensure that the O-rings and spacers are correctly positioned on the disc side.
- Exceptions: AHU28117A-01, -02 and -03, as a cover plate was used in these versions.
- Avoid shock loading to the shaft when the Agri Disc Hub is not mounted. This can damage the bearing.
- When mounting or replacing the disc, ensure that no contamination enters the bearing unit.
Nomenclature, Product Range, 3D CAD Data
Nomenclature
Technical details and advantages
- Applications: disc harrows, strip-till applications and seeding machines
- Double-row angular-contact ball bearings with a 40° contact angle to support high axial and radial loads
- Protection against contamination and moisture through a specially developed cassette seal and O-ring – even when using a high-pressure cleaner
- Maintenance-free lifelong lubrication through the use of high-performance grease
- Special NSK seal (DDU) prevents grease escaping
- Proven sealing performance against dust, water, plant fibres, fertilisers and stones
- Robust cast flange
Cassette seal & Sealing with an O-ring
Verification and Tests
Verification, tests and result of the examination
Water jet test over 200 hours: at the end of the test there were no signs of water ingress through the cassette seal.
Typical picture of a compact disc harrow covered in dirt following the use of liquid manure.
An NSK employee removing the Agri Disc Hub bearing unit from the machine arm.
There is neither contamination nor rust in the relevant part inside the O-ring.
No dirt was able to get through the cassette seal.
The seal can be seen to be in an outstanding condition.
Once the bearing had been dismantled, no dirt or debris was discovered inside the bearing or within the grease lubricant.
There is no sign of any damage or wear to the raceways.
Result of the Examination
Although the Agri Disc Hub bearing unit was used in extreme operating conditions in a compact disc harrow incorporating liquid manure, the bearing showed no signs of contamination, damage or wear. The Agri Disc Hub – and therefore the compact disc harrow – could have continued operating with no problems.
* Field trial 3,000 hectares.
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