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| Agricultural Machines |
| Combine and Forage Harvesters |
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Modern harvesters must meet the objective of a high handling
capacity combined with high-quality harvesting of the crop
concerned. Maximum availability is absolutely essential for
these machines, which are only used during the harvesting
season.
High-performance drive and control systems characterized by
reliability, efficiency and easy operation are essential components
of these machines and a prerequisite for optimum use of the
machines.
The information below gives you an insight into drive solutions
and working hydraulics for combine harvesters and forage
harvesters.
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Travel Drives:
State-of-the-art travel drives for combine harvesters and forage harvesters
are designed as axle drives. Yet, there are small numbers of
machines on the market with single-wheel drives.
Advantages of the axle drive:
- Space-saving, as no propeller shafts are required
- It is possible to distribute the tractive power between the front and rear axles
- Smaller hydraulic pumps are sufficient, since the Rexroth hydraulic motors can be switched off to zero displacement through swiveling.
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Alternatively, a front axle drive combined with single-wheel
rear drive can be used. This can be realized with variable
displacement motors, planetary gearboxes HYDROTRAC
GFT or directly with MCR radial piston motors.
Mechanical-shift gearboxes:
- The vehicle does not have to be brought to a standstill before changing gears. It is possible to shift while the vehicle is in motion.
- Shifting using a frictional connection makes the gearbox less prone to failure due to incorrect shifting.
- Heat generation is minimized due to coupling disk design with extremely small outer diameter.
- No change of direction of rotation necessary at the gearbox input when shiftingbetween gears.
Gearboxes with dynamic brakes:
- The frictional surfaces must be protected against contamination and moisture using disks that run in gear oil as friction elements.
- To minimize the installation space required, the number of components was minimized. The parking brake and the main brake, for example, use the same disk packet
- Friction brake is capable of absorbing the necessary braking energy even if the hydrostatic braking effect fails.
Electro-hydraulic header control (EMR) for combine harvesters:
- EMR provides active damping of header vibration while driving
- Header is controlled in the preset position, height or to ensure constant ground pressure
- Detection of ground contact to prevent damage to the header
- Optional transverse slope compensation of the header
Your contact:
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