Filter results

Results (250)

Sort by:

Select all Select all

Page 3

VDI Wissensforum GmbH - Dritev – Drivetrain for Vehicles 2020

Partial access

Select

VDI Wissensforum GmbH (ed.)

Dritev – Drivetrain for Vehicles 2020

Series: VDI-Berichte

Volume 2373 2020

Results in this title

V. Null A new generation of thermal fluid technology for high performance charging of electric vehicles – How new thermal fluids can enhance battery performance in EVs S. II-97-II-108

„… very high flow rates. Immersive cooling with Shell Thermal Fluid E5 TM is much more effective. With …” „… profiles under different fluid flow conditions. The computational chemistry group at the Shell Technology …” „… modules filled with Shell Thermal Fluid E5 TM 410 under static conditions (no oil flow) .Successful ‘Pass …”

S. Reuter, H. De Keyser, M. Doppelbauer Performance study of a PMSM with molded stator and composite housing With internal slot cooling – resulting in high continuous power S. II-17-II-32

„… undercuts are possible. To distribute the cooling fluid a simple loop flow pattern was chosen and can be …” „… parallel. The volume flow appears to be consistent even with variations of the total fluid flow. Fig. 21 …” „… transfer cylinder and then pressure is applied to the ram(piston), causing the composite material to flow …”

K. Sakai, T. Kishimoto, T. Kobayashi, T. Maekawa, T. Shinohara, M. Ogawa Development of the new chain CVT for middle capacity S. I-79-I-88

„… . Oil Pump with 2-Port Discharge The previous oil pump had some mechanical power loss since oil flow …” „… facing paper shape at the reverse clutch (Fig. 12). Furthermore, viscosity of the CVT fluid being …” „… : CVT fluid viscosity VDI-Berichte Nr. 2373, 2020 85 Fig. 14: Baffle plate for variator 3.4 …”

K. Kim New high efficiency CVT for middle class FWD vehicle S. I-271-I-284

„… this changes, there are also changes in power flow. The hub of the brake was changed to integrate with …” „… by 6.1mm. The input of power flow was changed from sungear to annulus-gear, and output of power flow …” „… is increased by using cooling fluid from engine, which can contribute to the improvement of fuel …”

H. Gürbüz, S. Ott, A. Sutschet, J. Kern Highly efficient clutch system for multispeed BEV S. I-119-I-132

„… is due to the increased fluid friction at the moment of switching. In addition to the constant …” „… coated material, diameter stage 2, pressure stage 2, oil temperature 40°C, oil flow 0.5l/min …” „… 2, pressure stage 2, oil temperature 40°C, oil flow 0.5l/min, lubrication via shaft drilling …”

P. Tenberge, A. Alnahlaui E-drive and hybrid-drive with 2 high-speed E-motors and a 2-speed gearbox S. I-233-I-252

„… traction contacts. In the sliding rolling contacts of the traction bodies, a traction fluid is compressed …” „… . Traction fluids from the Japanese oil and additive supplier Idemitsu Kosan Co. Ltd. can create traction …” „… two power outputs of the electric motors flow together. The first electric motor E1 drives the shaft …”

doi.org/10.51202/9783181023730

VDI-Wissensforum GmbH - DRITEV – Drivetrain for Vehicles 2021

Partial access

Select

VDI-Wissensforum GmbH (ed.)

DRITEV – Drivetrain for Vehicles 2021

Series: VDI-Berichte

Volume 2381 2021

Results in this title

R. R. Kasibhatla, P. Neidhardt, K. Caliskan Thermal Simulation according to Maturity Level in E-Drive Development S. 61-76

„… losses can be put into correlation to temperature, rotation speed, volume flow and fluid parameters …” „… https://www.ansys.com/de-de/resource-center/webinar/improvement-of-thermal-cfdemmodels-by-introduction-of-fmu-submodels Patankar, S. V. (1980). Numerical heat transfer and fluid flow. Taylor & Francis Inc. ZF …” „… all boundaries, interfaces, material properties and heat flow paths. The advantage of 3D simulation …”

A. Nees Flexible Electro-hydraulic Actuation System for Multi-speed Electrified Drivetrains – Requirements and Concept S. 275-290

„… . This requires a smooth power shift at all times. Transmission fluid will remain an important part of …” „… central pump is needed while pressure and flow control for the shift elements is done by smaller size …” „… actuation concept, especially for multi-speed EDUs. Hydraulic fluid, is obviously required. As shown …”

F. Bayer, J. Tochtermann Development of a Heavy-Duty E-Axle S. 621-636

„… direct oil cooling. As the cooling fluid directly touches the main heat source, namely the end and …” „… points and input values. From there, a first draft calculation of the required amount of cooling fluid …” „… number of different fluids, the decision was made to have only one common oil sump for e-motor cooling …”

A. R. Lowis, R. Smith hofer H8-DCT-850 – High Performance Dual Clutch Transmission for transaxle application S. 179-190

„… maintenance. The DCT concept required a low flow/high pressure hydraulic supply to actuate clutches and …” „… select gears. It also required a high flow/low pressure cooling and lubrication supply, to underpin the …” „… 135 mm Weight (inc. fluids) 175 kg Detailed evaluation of alternative concepts led to the …”

S. Dussinger, T. Wiedemann, B. Harter, B. Wiedenmann Simulation of induced axial forces on planet gear bearings at example of ZF’s 8-speed automatic transmission S. 469-486

„… investigations on the topic of oil management by coupling computational fluid dynamic and finite element solver …” „… a fluid with the assumption that its influence on the kinematics of the mechanical structure is …” „… for the planetary needles is defined to possibly mimic effects from the oil fluid inside the planet …”

T. Hillesheim Energy-efficient Hydraulic Control for the Multi-speed Transmission of an Electric Vehicle S. 319-328

„… at a constant flow rate - switchable oil pumps with one high-pressure and one low-pressure stage …” „… non-switchable oil pump with constant flow rate, and on the other hand, a hydraulic accumulator developed by …” „… using the oil pump with constant flow rate, the pump supplies the lubricating oil (which acts at the …”

C. Schmidt, H. Dhejne, J. Karlsson High Efficient 2 speed e-Axle – Highly efficient and shiftable under load S. 145-158

„… e-motor as an example. By using a smart and sophisticated power flow architecture, we can guarantee a …” „… oil flow is in axial direction through the stator slots and allows a direct heat dissipation from the …” „… conductors to the fluid. The oil is kept VDI-Berichte Nr. 2381, 2021150 inside the slator slots due to …”

M. Hein, J. Pellkofer, K. Michaelis, T. Tobie, K. Stahl, D. Kadach Test method A/16,6/90 with injection lubrication for discriminating different lubricants for dual-clutch transmissions S. 437-452

„… /2,76/50 ISO 14635‐3 flow greases variable speed EP step test A10/16,6R/90 A10/16,6R/120 FVA 243 ISO …” „… method A10/16,6/90 was established for automotive gear transmission fluids. The underlying …” „… gears are lubricated by spray lubrication with a flow rate of 1,0 l/min and controlled oil inlet …”

doi.org/10.51202/9783181023815

No access

Select

wt Werkstattstechnik online

Browse Volumes: wt Werkstattstechnik online

wt Volume 95 (2005) Issue 3 ISSN Online: 1436-4980

Results in this title

S. Güttler, T. Lenz Mikrodurchflusssensorik für höherviskose Fluide – Ein optisches Messverfahren für mittel- und hochviskose Substanzen S. 162-166

„… flow rate sensor for higher viscous fluids – An optical micro flow measure system for intermediately …” „… dis-pensing systems for intermediately and highly viscous fluids we deve-loped an optical micro flow measure …” „… impurities or added tracer particles in the flowing liquid. We present a precise micro flow rate sensor for …”

doi.org/10.37544/1436-4980-2005-3

VDI Wissensforum GmbH - International Conference on Gears 2022

No access

Select

VDI Wissensforum GmbH (ed.)

International Conference on Gears 2022

Series: VDI-Berichte

Volume 2389 2022

Results in this title

L. Hildebrand, F. Dangl, M. Sedlmair, T. Lohner, K. Stahl CFD analysis on the oil flow of a gear stage with guide plate S. 677-694

„… Computational Fluid Dynamics (CFD) simulations of the oil flow in gearboxes, essential information can be …” „… of the gearbox fluid flow with the guide plate was assumed to be causal. Otto [37] analyzed the …” „… study aims at extending the understanding of guided multiphase fluid flow in gearboxes and highlights …”

J. J. Zhang, Prof. Y. M. Hu, X. X Luan, Z. S. Zhang Research on the effectiveness of roelands formula with constant VPC in EHL of higher pair contact S. 119-132

„… continuity equation can be derived according to the fact that the net mass flowrate out of the fluid element …” „… Volume force vector of the fluid and solid (N/m3) Velocity strain tensor (1/s), ( ) / 2TV V Fr Froude …” „… (μm)N Viscosity of Newtonian fluid (Pa s)cenh VCentral film thickness in the constant VPC condition (μm …”

B. Legrady, M. Taesch, G. Tschirschnitz, C. F. Mieth Prediction of churning losses in an industrial gear box with spiral bevel gears using the smoothed particle hydrodynamic method S. 651-664

„… the fact that the fluid flow within gearboxes is inherently complex. This is caused by the complexly …” „… gear-scaling obsolete. Although overall fluid flow was reproduced accurately [19], [20], [21], [22] this method …” „… interlocking region resulted in a load-dependent and -independent loss increase. Computational fluid dynamics …”

Y. Marchesse, M. Ruzek, F. Ville, P. Velex On windage power loss reduction achieved by flanges S. 665-676

„… the fluid flow is aspired and then ejected by the tooth. When one flange is present at the suction …” „… side (especially when the clearance remains lower than 5 mm) the possibility to aspire a fluid flow is …” „… surrounding fluid is supposed to be pure air, the physical properties are evaluated at 25 °C (e.g. ρ = 1.185 …”

F. Reinle, D. Mangherini, E. Morgano, A. Bongiovanni Combining improved gear efficiency and improved fatigue performance through mass finishing S. 609-620

„… VDI-Berichte Nr. 2389, 2022 609usually fully or partly abrasive – and process fluid e.g. water and compounds to …” „… immersion can also by adapted to adjust the process flow for different workpiece geometries. The rotation of …” „… , an excellent process media flow could be generated. 1 Media in container 2 Workpiece holder 3 …”

H.-J. Dennig, L. Zumofen, A. Kirchheim, S. Winterberg, D. Stierli Increasing the safety against scuffing of additive manufactured gear wheels by internal cooling channels S. 1345-1364

„… addition to the manufacturing of force-flow-optimised lightweight structures, e.g., those used in …” „… possible. The next key function defines the flow principle: to connect several teeth, a serial or a …” „… parallel flow can be chosen. These two forms of flow are fundamentally different and have specific …”

A. Baumann, B. Bertsche Coefficient of friction behavior of gear oils and significance for the meshing process of spur gears S. 745-762

„… elastohydrodynamic fluid friction at high speeds. The investigations show that the coefficient of friction behavior …” „… transmission through the fluid. The coefficient of friction is a property that is dominated by the type of base …” „… oil and the type of VI improver in the area of mixed and fluid friction, especially with additional …”

W. Kassem, M. Oehler, B. Sauer, S. Schmidt, J. Hausmann Investigation of the time-dependent behavior of plastic gears with local tribological simulation S. 1281-1294

„… plastic material model component, flow curves are specified as a function of temperature. In the case of …” „… height of the lubrication gap in the tooth contact and the shear stresses responsible for the fluid …” „… friction mechanism is thus divided into boundary and fluid friction. The division is carried out by means …”

D. Mevissen, L. Uhlmann, U. Kupper, J. Brimmers, T. Bergs Analysis of friction of bowl-shaped surface structures resulting from alternative gear manufacturing processes S. 1371-1382

„… turning speeds of the specimens. The reduction of the fluid friction ratio in the first part of the …” „… much as the wire-eroded surface. In the region of boundary friction as well as in the region with fluid …” „… , where the machine-hammer-peened variant a070 showed the best friction coefficient in the region of fluid …”

M. Zalfen, J. Lovenich, O. Malinowski, C. Brecher, J. Brimmers, S. Neus, S. Stark, D. Kruger Test rig concept for high power VHCF gear testing S. 485-498

„… design is chosen. This can provide adequate stiffness and damping at a much lower oil flow rate compared …” „… oil flow back into the housing, thus enabling a closed lubricant circuit. Due to special requirements …” „… high flow rates, contactless centrifugal seals are used. These are, in contrast to contacting seals …”

A. Gebhard, W. Kassem, M. Oehler Cylinder-on-ring model wear tests as an input data source for the simulation of friction and wear of plastic gears S. 1133-1148

„… described in Fig. 3using a simplified flow chart.Fig. 3: Simplified calculation process of the gear …” „… is divided into boundary friction and fluid friction by means of a factor - the solid body contact …” „… division of the total friction into boundary and fluid friction is performed. With the locally acting line …”

J. Vorgerd, P. Tenberge, M. Joop Scuffing of cylindrical gears with pitch line velocities up to 100 m/s S. 903-914

„… VDI-Berichte Nr. 2389, 2022 905by an inner housing. By measuring the oil volume flow, the oil injection …” „… ] Facewidth T [Nm] Torque cp [∙] Specific heat capacity V [l/min] Oil volume flow da [mm] Tip circle …” „… ] Hertzian stress εα [-] Transverse contact ratio tK [s] Local contact time λ [-] Specific fluid film …”

P. Barreiro, S. Pfrimmer, G. Armutcu, J. Hermes Quality improvement of an aluminum gearbox housing by implementing additive manufacturing S. 1429-1446

„… , the most common defects are gas porosity, shrinkage holes, hot cracking, flow marks, misruns, and cold …” „… enable AM without supporting material and with a good flow, in order to remove the powder after printing …” „… temperature nor the fluids were taken into account. The FEM model was made with the casting die as the …”

doi.org/10.51202/9783181023891

Partial access

Select

VDI Wissensforum GmbH (ed.)

Automation 2021

Series: VDI-Berichte

Volume 2392 2021

Results in this title

D. Persson, J. Pohl, A. Rieder Increased reliability and safety in Coriolis flowmeter operation by monitoring its physical response to process conditions S. 737-750

„… presence of abrasive particles in the fluid or an increase in flow rate, where abrasive particles are …” „… planned accordingly. A Coriolis flowmeter measures mass flow by exciting the main oscillation mode of …” „… occur regardless of which flowmeter was selected, he also needed to measure both flow rate and density …”

doi.org/10.51202/9783181023921

1 2

3

... 50