Customized and market specific thermal robust clutch system solution Tata Motors Limited

Format:

Book

Conference/Event

Author/Creator:

Kapse, Ravi Ramesh, author.

Contributor:

Bernhardt, Johannes

Lakshminarayanan, Saravanan

Németh, Ákos

Thakare, Ankit

Conference Name:

SAE Powertrains, Fuels & Lubricants Digital Summit (2021-09-28 : Live Online, Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

The goal of reducing fuel consumption and CO2-Emission isleading to turbo-charged combustion engines that deliver hightorque at low speeds (down speeding). To meet NVH requirementsdamper technologies such as DMF (Dual Mass Flywheel) areestablished, leading to reduced space for the clutch system.Specific measures need to be considered if switching over from SMF(Single Mass Flywheel) to DMF. It has an impact on thermal behaviorof the clutch system for example due to reduced and differentdistribution of thermal masses and heat transfer to surroundings.Taking these trends into account, clutch systems within vehiclepower-trains are facing challenges to meet requirements e.g. clutchlife, cost targets and space limitation. Clutch development processmust ensure to deliver a clutch system that meets requirementstaking boundary conditions such as load cycles and driver behaviorinto account. Relevant load cycles are derived based on feedback& an analysis of driver behavior under varying road and trafficconditions. For example, one relevant load cycle is overriding ofclutch in 1st or 2nd gear in dense traffic condition that causeshigh thermal clutch load due to heat energy generated at the clutchfrictional surfaces. This heat energy is relevant for lifetime oreven destroys the clutch/clutch system if not considered properly.These load cycles are input for a simulation based clutchoptimization. The virtual optimization process is taking aspectssuch as thermal and lifetime performance for the given boundaryconditions of the system, the available installation space,materials (id est friction lining), part geometry and of course thecosts into account. This process is based on analyticalcalculations, thermal and thermal-mechanical simulations and CADmodelling. Recent development in thermal-mechanical simulationmethods allows a more application-specific consideration of thethermal behavior of the system, also in the early design phase. Itmakes possible to consider the influence of the surfacetemperatures, dynamic tapering, cushion deflection under variousload scenarios. These scenarios can be defined for multiple drivingconditions (including already discussed 1st and 2nd gear launches),thus thermal optimization is more oriented to real vehicleapplication. To validate simulation results physical tests werecarried out, 1st gear repeat restart on gradient and 2nd gear marchoff on flat road which includes temperature measurement todetermine the rise in temperature until certain number of cycles.In this paper, the approach for clutch optimization is shown basedon the analysis of two different clutch sets of the same sizeincluding experimental results based on vehicle measurements

Notes:

Vendor supplied data

Publisher Number:

2021-01-1239

Access Restriction:

Restricted for use by site license