Schaeffler Rolling Bearings for Tractors and Graders
Tractors and graders require high drive power and operate at high speeds. Many of the latest tractors offer more than 100kW drive power, with some achieving road speeds of up to 80kmh. Most graders operate under full load at speeds of up to 40kmh.
The high drive power required for these types of applications is transmitted via the gearbox and differential. Therefore, significant fuel savings can be achieved by focusing on improving the efficiency of these two key drive train systems.
Rolling bearings are generally specified in order to save energy. Where mechanical work is required or components are in motion, rolling bearings ensure reduced friction and therefore increased energy efficiency.
The internal design of a rolling bearing, the design of the cage for example, will also have a major impact on the bearing's performance and friction.
Other design approaches involve the use of friction-reducing, wear-resistant materials and coatings, as well as applying further surface quality improvements in the functional areas of the bearing during volume production.
Low-friction tapered roller bearings are optimised in terms of their geometry, surface structure and materials, as well as dimensional and running accuracy.
As a result, the basic dynamic load rating is increased by up to 20 per cent and the basic rating life is extended by up to 70 per cent.
This means that for specific applications it is now possible to select more compact, lighter bearings, which leads to a further reduction in friction.
The use of premium grade materials and special heat treatment provides the bearing with a higher resistance to solid particulates and contaminants such as sand, dirt, dust and heavy clay soil.
In addition, an improved logarithmic profile was developed for the bearing raceways and roller surfaces, which compensates for stress peaks during high loads or misalignment.
Due to the optimised roller surfaces and contact geometry, an elasto-hydrodynamic lubricant film is created, even at very low speeds.
The two-cage design enables the optimal adjustment of the two raceways independently of each other to match the application.
This ensures maximum load support with minimum bearing size and even lower friction.
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