Filter results

Results (116)

Sort by:

Select all Select all

Page 2

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

„… all boundaries, interfaces, material properties and heat flow paths. The advantage of 3D simulation …” „… an expensive process. Measurement techniques to study the oil flow distribution in electric drives …” „… multiphase numerical simulations of oil and air mixture are extensively used to analyse direct oil cooling …”

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

„… into the e-motor and increases the electrical conductivity. Additionally, the overall oil flow …” „… required can be relatively big. To address the issue of high flow, two electric oil pumps were planned to …” „… achieve the required cooling flow. Additionally, as oil flow is also power, measures were taken to reduce …”

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

„… integrated a single variable vane oil pump to supply the high pressure and high flow demands, with an …” „… electro-mechanical oil pump to cover pure electric driving and to boost flow during high power events. The result is …” „… the overall transmission concept and layout was a large, flat oil sump at the bottom of the …”

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 …”

Z. Caba, M. Zafer, C. Harman, G. Hellenbroich, Ö. Eyigöz Multi-speed e-axle for electrified heavy commercial vehicles S. 609-620

„… lubrication system was designed to provide sufficient oil volume flow to all relevant lubrication points. A 1 …” „… , strainer and an electric oil pump have been selected based on the requirements and simulation results. Fig …” „… challenging package envelope, and based on detailed energy consumption simulations. The final design includes …”

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

„… scope to identify regions with insufficient oil flow, see also Fig. 16. In the wet map contour all …” „… that here an early simulation state is shown and that more segments would be covered by oil with an …” „… oil, right: oil wet map contour Another activity at ESI aims to reduce the simulation time by …”

M. Dilzer BorgWarner P2 Modules – from HV to 48V S. 35-46

„… coolant flow rate. Keeping oil flow rate significantly below 5lpmin for the majority of operation points …” „… given as shown. The information is based on qualified simulation toolchains. The Stator outer …” „… complexity and remove the water coolant channel. A carefully balanced oil cooling configuration allows for …”

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

„… oil flow is in axial direction through the stator slots and allows a direct heat dissipation from the …” „… high efficiency and performance repeatability. New simulation methods are required to obtain an …” „… e-motor as an example. By using a smart and sophisticated power flow architecture, we can guarantee a …”

J. De Landtsheere TREMEC HYbrid DRive Axle – HYDRA – Hybridization enables RWD dynamics in a FWD car S. 125-144

„… torque vectoring AWD system, for which simulations show that performance and fun-to-drive are stepped up …” „… gear set is a non-hypoid design to allow for low viscosity oil instead of typical hypoid lubrication …” „… oil, improving churning losses and clutch controllability. The offset between input and output shafts …”

E. Schneider, C. Danzer, E. Schreiterer Modular and highly functional Hybrid Platform for subcompact cars up to full-size SUV S. 191-206

„… power flow in the first speed for a low mechanical effort and a short gear set with only 3 gear set …” „… simulation of the shift process. Based on the results of this simulation, the main parameters such as shift …” „… oil cooling (no radial space for a water jacket required) for high peak torques and to lower the …”

doi.org/10.51202/9783181023815

VDI Wissensforum GmbH - International Conference on Gears 2017

Partial access

Select

VDI Wissensforum GmbH (ed.)

International Conference on Gears 2017

Series: VDI-Berichte

Volume 2294 2017

Results in this title

B. Bauer, R. Hambrecht, A. Kube Thermal analysis and optimization of gearboxes by simulation S. 917-926

„… direct oil contact. Step two calculates the heat flow from the housing to the environment, considering …” „… to simulate the oil flow inside the gearbox [Fig. 6, left] and the airflow around it [Fig. 6, right …” „… proportion to each other at the correct locations, the correct oil flow and resulting distribution and the …”

E. Maier, A. Ziegltrum, T. Lohner, K. Stahl Characterization of TEHL contacts of thermoplastic gears S. 1483-1496

„… flow) over rolling friction (Poiseuille flow) and approximates the shear rate with an appropriate film …” „… . Investigations are carried out numerically on a finite-element based TEHL simulation model (tribosimulation) and …” „… desired temperature to be injected directly into the inlet region of the disk contact. The volume flow of …”

F. Concli, C. Gorla Numerical modeling of the churning power losses of gears: an innovative 3D computational tool suitable for planetary gearbox simulation S. 881-892

„… , Analysis of the oil squeezing power losses of a spur gear pair by mean of CFD simulations, ASME 2012 11th …” „… suitable for planetary gearbox simulation Franco Concli, Faculty of Science and Technology, Free …” „… Abstract Thanks to the recent developments in the computer science, simulations are becoming an …”

M. Oehler, B. Magyar, B. Sauer A new standardizable calculation method to predict the efficiency of worm gear drives S. 363-372

„… scope of the research project FVA 729 I "Worm Gear Efficiency", a physically based simulation method …” „… different gear sizes and ratios. An extensive parameter study with the use of this simulation program was …” „… ratios. The aim of this work is the development of a physically based simulation method which is …”

J. Yu, L. Yao, C. Ren, X. Yan, L. Lin Design and experimental validation on a novel tow speed transmission for electric bus S. 97-108

„… the simulation for the dynamic of the electric bus, the result demonstrates the dynamic performance of …” „… ratio. Keywords: two speed transmission; electric bus; simulation; experiment 1. Introduction The …” „… simulation and experiments on the two-speed automated manual transmission (AMT) are studied [3], and an …”

Y. Shen, S. Rinderknecht, M. Hoppert General modelling method of power losses in transmission with parameter identification S. 905-916

„… the gear pair spin that are bathed in the lubricant oil or surrounded by an oil-air-mixture, like the …” „… oil churning losses [10]-[12]. Same as the gear losses, the bearing losses are composed also of load …” „… losses due to oil churning Modelling of power losses due to spinning gears is complicated, so most …”

A. Furtmann, G. Poll Electrical stress and parasitic currents in machine elements of drive trains with voltage source inverters S. 109-118

„… whole current of a component has to flow and thus it is an easy spot for measurements. While the …” „… lubrication To compare the voltage dividing behaviour, a simulation of the drive train with calculated …” „… capacitances [1, 8, 9] is done based on a measurement of the common-mode voltage. In this simulation the …”

C. Brecher, C. Löpenhaus, R. Greschert Influence of the grinding process on the formation of boundary layers on gears S. 1427-1438

„… . the tooth flanks are not completely separated by an oil film. Boundary layers, which develop on the …” „… . The metalworking fluid Houghton Excelene 416 is based on hydrocrack oil, which has also been used in …” „… different combinations of ae and vf on a constant level of Q’w convey that the energy flow is also …”

S. Stoyanov, V. Dobrev, A. Dobreva Investigating dynamic behavior of planetary gear trains through the systematic approach S. 197-208

„… transmitted through several symmetrically positioned satellite. Therefore, the power flow is distributed in …” „… simulation with great deformations and nonlinear behavior of material including inertia effects as results …” „… oil presence in gear trains, Fig. 3. The damping effects can influence both the normal and …”

doi.org/10.51202/9783181022948

VDI Wissensforum GmbH - Gleit- und Wälzlagerungen 2017

Partial access

Select

VDI Wissensforum GmbH (ed.)

Gleit- und Wälzlagerungen 2017

Series: VDI-Berichte

Volume 2308 2017

Results in this title

D. Vaes, P. Tesini, K. Stadler Evaluation of roller slip losses in wind turbine gearbox high speed shaft bearings S. 283-298

„… and to validate the simulation model. Both the oil flow rate and temperature have a significant …” „… or no load. It is therefore critical to include the influence of the oil flow in the simulation …” „… analysis show the significant influence of the oil flow, operating oil viscosity and bearing arrangement on …”

doi.org/10.51202/9783181023082

VDI Wissensforum GmbH - Gleit- und Wälzlagerungen 2023

No access

Select

VDI Wissensforum GmbH (ed.)

Gleit- und Wälzlagerungen 2023

Series: VDI-Berichte

Volume 2415 2023

Results in this title

L. Maccioni, F. Concli Flows in Oil-Bath Lubricated Tapered Roller Bearings: CFD Simulations Validated via PIV S. 247-266

„… , Numerical simulations of oil flow inside a gearbox by smoothed particle hydrodynamics (sph) method …” „… Flows in Oil-Bath Lubricated Tapered Roller Bearings: CFD Simulations Validated via PIV Dr.-Ing …” „… formulations to estimate oil flow rates and resistant torques in TRBs have been developed exploiting simplified …”

M. Busch Numerical simulation of rotor and gas-film dynamics in Schaeffler’s foil air bearings S. 221-234

„… ‐lubricated plain bearings, which can lead to speed and load‐dependent natural frequencies, to bearing instabilities and to undesired whirl motion of the rotor at high speeds. Numerical simulations are required to take these complexities into account. A physical bearing model …” „… ) (b) Figure 5: Simulation results of the ENDOF method for the Schaeffler bearings of Fig. 1 …” „… ]. And indeed, the simulation model reveals significant deviations in the load capacity and in …”

J. Dörner, T. Klütsch, Y. Ishibashi, S. Katto Development of Electrical Erosion Resistant Insulation Coating and Overmolding for Bearings in HEV/EV S. 59-78

„… high-frequency current flow through bearings. Often it results in ridge marks, increased vibration and noise and …” „… are insulated, a small amount of capacitor current may flow. Even at low electrical capacitance …” „… . Besides the loads and temperatures, conformity with several types of oil and grease and a dimensional …”

A. Rottmann Additive Fertigung von Wälzlagerringen – Additiv gefertigte Wälzlagerringe mit integrierten Kühlkanälen für Luftfahrtanwendungen S. 79-94

„… assurance, the process parameters for additive manufacturing and the optimized process flow for additive …” „… Kühlkanal wurde eine Simulation der numerischen Strömungsmechanik (CFD) und der kon-VDI-Berichte Nr. 2415 …” „… – 12 l/min Schmiermenge Kühlkanal 0 – 1,8 l/min Öl Mobil Jet Oil II Eine Beispielauswertung der …”

doi.org/10.51202/9783181024157

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

M. Saborío, O. Sarmiento, C. Böhm High efficiency electric transmission oil pump – Transmission hydraulic efficiency improvement through hybridization

„… moving away from pure mechanical oil-pumps to give space to flow on-demand pure electrical supply …” „… certain amount of flow at zero ICE speed. This is typical for start/stop systems were some oil is …” „… . Achieving flow on demand In order to optimize the overall efficiency of the oil supply system it is …”

A. Manelli, F. Filippo Irato, C. Cavallino, R. Gay e-FDU: Concept, develop & industrialization of a novel P4 powertrain – From concept to industrialization of a novel P4 powertrain in 24 month

„… decision to use an “8” shape like layout, as visible in Fig. 3, and to use an external oil cooling circuit …” „… hydraulic oil. 3. Weight saving: up to 5Kg of weight reduction 4. Installation simplification: no need to …” „… see all the mechanical components which are responsible of the torque flow, in particular the …”

M. Deiml High speed electric drive system – A solution for the next generation E-cars

„… forced lubrication system is increased control over the oil flow rate to each component as well as …” „… that needs to be considered for spraying the oil on gears is the oil flow rate and oil pressure. A …” „… High flow rate and pressure might be needed for gears with high rotational speed to make sure that oil …”

S. Worrall, J. Foulsham, I. Stone, T. Gassmann CeDrive – Electric drive technology for a new era – Advanced cooling and control of high-speed eDrive

„… strong effect of the used hydraulic power (oil pressure and flow rate) reflected by the 10 W and 80 W …” „… shape have an effect on the cooling pattern and the HTC for a given oil pressure and flow rate …” „… with variable switching frequency and sophisticated control software. Advanced simulation tools and …”

T. Casper, G. Spengler, M. Bromberger The high-efficiency fully electric drivetrain of the new Porsche Taycan

„… . Electric oil pump with lubrication as required. Encapsulated final drive gear with targeted oil flow …” „… front and rear axle Tangential Force Diagram Nowadays, modern simulation tools make it possible to …” „… shaft at the end of the electric motor, there is a radial shaft seal ring, which seals the oil chamber …”

C. A. Spangler Borg Warner’s P1 and P2 hybrid drive modules – Modular kit for P1 and P2 hybrids

„… oil with the main transmission a direct acting pressure pump is utilized; For systems where oil …” „… local control hydraulic modules available to add the necessary clutch pressure and lubrication flow …” „… solenoids, gear actuation control pressure and flow solenoids and flow control cooling and lubrication …”

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

„… . 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 …” „… , the final drive to the differential and a small electrically driven oil pump for lubrication and …”

doi.org/10.51202/9783181023730

1

2

3 ... 24