Bearing applications in agricultural machinery

In this article Schaeffler discusses various bearing types for use on agricultural machinery.

Using its vast experience of supplying reliable, high-quality, maintenance-free bearings to the automotive sector, the Schaeffler Group has also built an enviable reputation for its bearings in agricultural applications.

Heavy-duty agricultural machinery, including tillage and sowing machines, harvesters and tractors, must withstand extremely harsh operating conditions. Key here is the selection of appropriate bearing supports and seals.

Dirt, dust, sand, high humidity levels, heavy soils and shock loads all take their toll on machine components and seals. Operating large machinery often incurs high costs for regular bearing maintenance. Indeed, specialist agricultural machinery contractors are now demanding maintenance-free bearings and seals.

Components on a harvester, for example, have to cope with plant remnants and sap, the acidic contents of which can cause ingress of dirt, leading to seal damage. On a corn harvester, high rotary speeds lead to high mechanical stresses on the bearing. In addition, contamination and acidic corn sap affect the seal. To solve these problems, Schaeffler has developed a ready-to-fit bearing unit with triple-lip sealing, which is similar to automotive wheel bearings. Flingers can also be offered as an additional protective measure against the ingress of dirt and other contaminants. These components are pressed onto the rotating inner ring and use centrifugal forces to transfer contamination away from the bearing.

Grease chamber

Schaeffler's double-row angular contact bearings transmit loads through a solid housing into the adjacent structure. The bearing has an additional grease chamber that protects the bearing from dirt and corn sap. The spherical bearing outer ring and the counter-shaped surface in the housing compensate for any misalignment in the adjacent structure.

Similarly, tillage machines that are used to prepare the field for seed planting also require very robust bearing supports. The bearings are combined with suitable flange housings, which simplify installation.

In plough discs, the inclined position of the disc results in transverse forces and bending moments, as well as radial loads. For these applications, Schaeffler offers double-row angular-contact ball bearings or robust, four-point bearings for applications with limited space. Robust ball bearings are also offered for shaft supports.

For seeders, where the forces involved are lower, Schaeffler offers smaller bearing supports, as well as corresponding bearings for combinations of tillage and seeding machines.

Tractor applications

Increasing working speeds and the higher performance capacity of tractors means that drive and power transmission units are subjected to higher stresses, which places greater demands on the bearing arrangements. For these applications, Schaeffler offers both standard bearing units and custom-designed bearings.

On tractor engines, for example, under its INA brand, Schaeffler offers various belt-drive components, such as tension systems and overrunning clutches, water pump and fan bearings.

Together, Schaeffler's INA and FAG brands offer a wide range of bearings for applications in gears, power transmission systems and axles. This includes needle roller bearings, drawn-cup needle roller bearings and needle roller cages, machined or manufactured by forming. Schaeffler's premium quality X-life bearings boast improved surface and geometrical accuracies, resulting in increased service life.

Full-complement needle roller bearings are offered for maximum load-carrying capacity in tight installation spaces and needle cages with a special, profiled KZK cage are used in high-acceleration applications. Similarly, cylindrical roller bearings with different cage designs (and as full-complement variants) with or without outer ring are other important components for the tractor's drive train.

Schaeffler's X-life tapered roller bearings with large contact angle can be used for high-load applications, with various heat treatment and material coatings available. These types of bearings are often used in transmission-integrated hydro engines, pumps, pinion bearing arrangements and rear axles.

Clutches

For the interface between engine and transmission, Schaeffler can provide its LuK branded clutches, which incorporate specially developed clutch release bearings. Here, effectively sealed bearings with drawn outer and/or inner rings are used, which enable cost-effective overall designs to be executed, while offering high reliability and extended service life.

For supporting slewing, tilting and for the alignment of chassis movements, axle suspensions and load harnesses, Schaeffler's spherical plain bearings and rod ends are available. Spherical plain bearings with complex lubrication groove systems on the outer ring can be used in combination with spring-dampened front axles and chassis.

Stabilisers, damping and hydraulic cylinders are fitted with spherical plain bearings and rod ends. For example, Schaeffler's Elgoglide maintenance-free, heavy-duty spherical plain bearings are used in the wishbone systems of front axles with independent wheel suspension. Maintenance-free Permaglide cylindrical plain bushes can be found in door hinges, engine hood supports, lever sets and rod systems.

Housed bearings

In agricultural machinery, housed bearing units are often used to compensate for static angular misalignment of the shaft of up to 5 degrees for non-lubricating units. The housing bore and bearing outer ring are spherical in shape so that the radial insert ball bearing can align itself in the housing.

In conjunction with the different housing types (cast iron and sheet steel), Schaeffler's radial insert ball bearings form complete units, offering significant rationalisation options at the design stage and during customer manufacturing/assembly. Numerous combinations are possible for every application.

Radial insert ball bearings come with a choice of five seals. Most seals comprise three pieces and are made from zinc-coated outer and inner steel plates with rubber sealing ring. This prevents the ingress of dirt and moisture, while also ensuring the required elasticity and preload of the seal, even after a long period of operation. The deep-drawn outer steel plate protects the sealing ring against mechanical damage. Bearings with R-seals have a larger grease reservoir due to sealing shields that are bent to the outside. All sealing concepts comprise evenly and concentrically abutting rubber lips for increased bearing life, as well as firmly rolled inner and outer caps to ensure easy re-lubrication.

Schaeffler's Corrotect coating can be applied to its radial insert ball bearings, offering customers a corrosion-resistant, low-cost alternative to stainless steel bearings. The inner rings and locking collars are coated against fretting corrosion as standard, which also prevents rust formation at the sealing lip.

Schaeffler (UK) Ltd

Unit 308, Fort Dunlop
Fort Parkway
BIRMINGHAM
B24 9FD
UNITED KINGDOM

+44 (0)121 313 5830

info.uk@schaeffler.com

https://medias.schaeffler.co.uk/en

More applications
1 week ago
NSK bearings reduce concrete floor manufacturing machine failures to zero
Regular bearing failures in a concrete floor manufacturing machine were leading to extensive downtime, costly lost production, and high maintenance costs. To rectify the problem, the customer turned to the expertise of NSK for a redesigned wheel hub and stub axle assembly.
1 week ago
Servodrives help protect chair castors and cut packaging costs
Drives and motors specialist Yaskawa has played a key role in the development of an automated system specifically designed to fit protective plastic caps onto chair castors, using its Sigma-7 series servo-drives and a SLIO-series controller.
1 week ago
SKF streamlines bearing analysis for Ansys users
With the new SKF Bearing App for Ansys Mechanical, design engineers have instant access to accurate stiffness data on more than 10,000 bearing designations. The app is available in the Ansys Store free of charge.
1 week ago
Omron awarded platinum rating from EcoVadis for sustainability
Omron has been awarded the Platinum rating following a sustainability assessment by EcoVadis. A score earning a Platinum rating, which is the highest distinction, puts the company within the top 1% of all the businesses assessed for sustainability performance.
2 weeks ago
ABB Value Provider wins order for rolling mill DC drive solution
DC drive specialist Iconsys is set to deliver a bespoke drive upgrade solution comprising two 12-pulse drive suites from ABB for a UK steel mill’s payoff and tension reels, used to feed and recoil steel strip through a production line.
2 weeks ago
What are the design considerations when specifying lead screws?
The first in the new ‘Design • Engineer • Build’ series of video podcasts focuses on lead screws – components that are at the heart of countless engineering systems. We talk to Phil Jones at Abssac about the enduring popularity of these essential design products, and the design considerations in their specification.
2 weeks ago
Harting honoured with the ‘Best of Industry Award’
The industry media of the Vogel Communications Group presented their ‘Best of Industry Awards’ shortly before the turn of the year. The Harting Technology Group emerged as the winner in the ‘Electrical Equipment’ category with its Han-Modular Domino modules.
2 weeks ago
Quick ROI and 60% decrease in maintenance travel with remote access
Brazilian surface treatment systems manufacturer Erzinger was keen to limit service trips as much as possible to serve customers faster. By implementing IXON Cloud, it can now support its customers remotely, and work in an intuitive and secure way. It can even set up multiple simultaneous connections to work together on the same project. The result is cost reduction, quick ROI and happier customers.
2 weeks ago
Nord high up in the sustainability ranking
Nord Drivesystems was assessed by the rating agency EcoVadis and awarded the silver sustainability certificate in 2022. In the overall ranking, the North German company is in the top six percent of manufacturers in the industry assessed by EcoVadis.
3 weeks ago
Mitsubishi Electric helps door manufacturer triple its throughput
Renowned door manufacturer Profile Developments has seen a threefold increase in its productivity, thanks to its latest collaboration with Mitsubishi Electric, with a solution based on multiple FR-E series inverter or variable speed drives (VSDs) and other system-matched components, such as a GOT 2000 series HMI and MELSEC iQ-R PLC.

Login / Sign up