ADI DAYS - Charlotte Van de Wege
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CNH - Sliding hub for variable belt drive
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ADI DAYS - Charlotte Van de Wege
- 1. Sliding hub for a variable belt drive Austempering, A Technology for Substitution ADI DAYS 2016 6th – 7th October Minerbe 1
- 2. Sliding hub for a variable belt drive Austempering, A Technology for Substitution ADI DAYS 2016 6th – 7th October Minerbe 2 CR rotary combine Optional variable header drive: Continuously variable speed of the header and intake feeder
- 3. Sliding hub for a variable belt drive Austempering, A Technology for Substitution ADI DAYS 2016 6th – 7th October Minerbe 3 Bigger harvesters requires more power
- 4. Sliding hub for a variable belt drive Austempering, A Technology for Substitution ADI DAYS 2016 6th – 7th October Minerbe 4 INPUT DRIVER OUTPUT DRIVEN LOW SPEED HIGH SPEED Variable belt drive principle
- 5. Sliding hub for a variable belt drive Austempering, A Technology for Substitution ADI DAYS 2016 6th – 7th October Minerbe 5 Variable belt drive principle – positorque sense system
- 6. Sliding hub for a variable belt drive Austempering, A Technology for Substitution ADI DAYS 2016 6th – 7th October Minerbe 6 Sliding hub was initialy made in ductile cast iron GJS-500-7 Fatigue failures occured during test phase Sliding surface induction hardened to 40-50 HRC (~371-475 HB)
- 7. Sliding hub for a variable belt drive Austempering, A Technology for Substitution ADI DAYS 2016 6th – 7th October Minerbe 7 A new, reinforced design was introduced Sharp notch removed
- 8. Sliding hub for a variable belt drive Austempering, A Technology for Substitution ADI DAYS 2016 6th – 7th October Minerbe 8 ADI 1050 material improved fatigue resistance and wear resistance No cost increase because surface hardning is not required anymore Sliding surface induction hardening not required anymore Hardness [HB] Tensile strenght [N/mm² ] 0,2% proofstress [N/mm²] Elongation [%] GJS-500-7 170-230 500 320 7 ADI 1050 GJS-1050-6 t < 30 320-380 1050 700 6 30 > t < 60 1000 4
- 9. Sliding hub for a variable belt drive Austempering, A Technology for Substitution ADI DAYS 2016 6th – 7th October Minerbe 9 Future steps at CNH ADI will be involved in: - Applications where higher strength is required and a small build in space is available - Possible cost reduction program on parts where an additional surface heat treatment is now required - Applications which are suffering from wear - Weigth reduction All of the new designs are developed with close collaboration with the material engineers - Prototype parts are tested both in a lab and in a field environment - Quality check is done before approving a supplier
Editor's Notes
- Good afternoon everyone, my name is Charlotte Van de Wege and I’m working for the CNH industrial group. CNH industrial is containing different brands in different sectors as agricultural equipment, construction equipment, commercial vehicles and powertrain. More specific, I’m working for the New Holland Agricultural brand and am a design engineer for the functional drives on the combine harvesters.
- On one of our combine harvesters, the CR rotary combines, we offer a variable header drive as an option to make it possible to continuously vari the speed of your header and intake feeder. The operator of the machine can so regulate the crop intake flow depending on the field conditions and yield.
- As the machine performances are raising, the headers are becoming bigger to harvest more crop at the same time. Also when harvesting corn, the stalks are being chopped before entering the combine and so this variable drive need to take up a lot of power demand.
- To achieve this continuously speed regulation, we use a variable belt drive system which is operated by hydraulic pressure on the input side and spring pressure on the output side. When a higher speed is required, the hydraulic pressure forces the input sheaves sliding axially closer together, causing the belt to ride on a higher diameter at the input side and pulls itself against the spring force on the output side on a smaller diameter. When requiring a lower speed, the hydraulic pressure looses and the spring force is pushing the sheaves closer together at the output, and open up at the input side.
- To prevent belt slip during operation, an additional axial force is generated on the driven side using a positorque sliding system. When more power is demanded by the application, the sheaves are being pushed together by the torque sense system, causing a higher axial force on the belt and making it possible to transmit more power. On the right picture, you can see the parts used in our variable header drive. One sheave is attached to the right yellow cam and the other sheave is attached to the left yellow cam. Between the 2 cams, there is a plastic sliding block which is having a better friction component and reduces surface wear.
- At first, the sliding hub was made out of ductile iron material. The sliding surface of the part needed to be surface hardened. During labtests and tests in the field, it was found that the strength was not good enough to avoid fatigue failures.
- FEA simulations learned us that the sharp notch was causing high stress concentrations. We removed that in the design and meanwhile, we were also looking for a higher strength material.
- To avoid cost increase, we took ADI 1050 material because that has a hardness of 320-380 Brinell, which is close to the required hardness we use to achieve by the heat treatment of the surface. This step is with the ADI not required anymore. The 1050 material offers us a much higher tensile strength without loosing too much elongation. Currently, we have successfully implement this part into production.