Giuseppe Pellizzi Prize 2016

Transcription

1 Giuseppe Pellizzi Prize th Members Meeting of the Club of Bologna November 13, 2016 VP/D VM Systematic development and analysis of continuously variable transmissions with inner power split for mobile machinery Dr. Marco Ramm

2 Content I. Motivation of inner power split transmissions (ips) II. Method for design analysis and synthesis of ips transmission concepts III. VP/D VM Design approach of modular ips transmission IV. Summary

3 I. Motivation P= * = IVT = Infinite variable transm. kw 4 kw Engine Power P < 100 kw IVT* with hydrostaticmechanical power split Transmission technology Power shift transmission or hydrostatic IVT*? Outer power split (ops) EQ200 Less comfort (PS) High fuel consumption Low maximum speeds Improvement necessary ops transmissions are unsuitable high specific costs IVT enables high comfort and automation of tractor & implement Low fuel consumption due to power split technology needed space for power split transmission components New approach for improvement needed

4 I. Motivation Costs of IVT Technical & economical suitable Technical doubtful Economical doubtful Costs * = IVT = Infinite variable transmission ops ips Potential specific costs ( /kw) Hydrostatic < 100 kw > 200 kw Power OUTER POWER SPLIT (ops) EQ200 High expense needed quantity of components Good efficiency INNER POWER SPLIT (ips) HYDROSTATIC APPROACH of ips-transmission Poor efficiency Reduction of needed components by functional integration low cost & compact power split Low cost Flexible integration

5 II. Design analysis and synthesis of ips concepts ops vs. ips OUTER POWER SPLIT (ops) EQ200 INNER POWER SPLIT (ips) Hydro-Mechanical-Differential Elementary functions of PS-Transmissions Input HMD Hydr. motor Junction ω1 ω2 ω3 Differential T1 T2 T3 Variator Ta Te P M ωe ωa Design independent method useful for development of ips-transmissions

6 II. Design analysis and synthesis of ips concepts Design principles of ips transmission 1 Junction = Mechanical connection of hydrostatic motor and HMD 2 Variator = standard hydrostatic machine 3 Differential = variator with released housing fixation Hydrostatic-mechanical Differential Tin HMD D p Tout 3 Input HMD Hydr. motor 2 Fixed correlation between pressure and torque Correlation = function of displacement volume of HMD 1 FP Fn Tin D p Tout FC Differential with variable ratio

7 II. Design analysis and synthesis of ips concepts Design analysis of ips transmission Realized ips-transmission Further relevant ips-transmissions: HONDA with HFT ( 2000) for motorbicycles (P = 45 kw) Patent from RENAULT ( 1906) - automotive Coupled cylinder of HMD and motor Specific design of motor and HMD Yanmar i-hmt ( 2015) - tractors Swash plate (SP) Input HMD Hydr. motor Wobble plate (WP) input Pistons SP valve diversion Pistons of WP No beneficial usage of hydrostatic standard components

8 II. Design analysis and synthesis of ips concepts Similar design independent from power split concept coupled Simulation based concept analysis Input coupled Double differential Compound Efficiency up to 20% better than hydrostatic transm. Economical usage of ips-transmissions requires flexible integration and new design approach Tout efficiency New ips-concepts could be found

9 III. Design approach of modular ips transmission Design of individual HMD HMD = Core element of ips Input Design Study Hydr. channel HMD Hydr. connection Prototype for test bench analysis Input Hydr. motor Size comparison with standard hydr. machine Usage of standard components HMD standard pump 205 mm 175 mm 230,5 mm (cylinder, pistons, ctrl. plate) Variable wobble plate without reset forces In total 8 patens during PhD Similar size than standard pump 257 mm Modular and economical ips-design is given with new HMD-design approach

10 III. Design approach of modular ips transmission Benefits of modular ips & individual HMD New design option bent axis usage Classic ips design Radial offset For axial compact design Coaxial HMD with swash plate unit Usage of bent axis units Better efficiency New design option flexible integration Similar integration like hydrostatic tr. Wheel loader Modular ips enables flexible integration and best efficiency due to standard hydrostatic Telescopic loader

11 IV. Summary I. Practical Relevance of PhD New ips approach enables power split transmissions (high efficiency) for mobile machinery with P < 100 kw Flexible and low cost integration like hydrostatic transmission Efficiency improvement up to 20 % compared to hydrostatic transmission Space and expense benefits like common hydrostatic drivetrains Tout effic ency II. Benefits for agriculture and farmers III. Level of originality and innovation Improvement of existing analysis & synthesis method 8 patents could be applied during PhD phase

12 Thank you for your kind attention! Thank you for your kind attention