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Parker’s Pump and Motor Division (PMDE) develop hydraulic motors to improve seeding performance by increased speed
THE CHALLENGE
Precision seed drills were designed as systems with lower speed fan drives for seed distribution. The challenge was to increase the performance and productivity of the machine while reducing fuel consumption. The goal was to achieve a speed range from 5000 rpm to 7500 rpm. Parker Hannifin Corporation's Pumps and Motors Division (PMDE) developed a new hydraulic motor to meet the new performance targets.
THE SOLUTION
The pneumatic seeder offers the most advanced planting method, so the seed is conveyed to the metering elements by an air stream from the hydraulic fan. The seed is then transferred through lines to the seed coulters. The planting drill technology carries out levelling, seedbed preparation, reconsolidation, seeding and pressing in one pass. It is known to provide impressive precision at high working speeds in the field. Thanks to the individual row depth control, air seeders always places the seed at the intended seeding depth. You benefit from an even emergence over the entire field.
In order to deliver perfect airflow within the pneumatic system, one component standsout as beeing most important. It‘s the hydraulic fan motor that reliably delivers high performance speed in certain load cycles. The different sizes of the seed drills mean that different hydraulic motors can be used. For seeder machines with a working width of 3 m – 4 m, primarily PGM511 gear motors from the factory PMDE-Chemnitz are used, which deliver a performance speed of 5.000 rpm. For working widths beyond 4 m, primarily F10 motors from PMDE-Trollhättan are used, with more power and speed rates above 7000 rpm.
For usages in smaller working ranges at the field the PGM511 External Gear Motor is the best match. It combines a very simple and robust design together with an upper-level output speed rate.
The Parker Hannifin Gear Motor has more advantages beside speed rate. The most important is no need for a costly outboard bearing. This saves money and makes the motor small and very compact. We secure this thanks to an intensive pretesting of the motors in our labs plus an extra effort of having field test together with the OEM of agriculture equipment.