Investigating the efficiency of automotive manual gearboxes by experiment and simulation

Schaffner, Thomas; Allmaier, Hannes; Girstmair, Josef; Reich, Franz Markus; Tangasawi, Osman A.M.

doi:10.1177/1464419314539302

Cited by 10 publications

(9 citation statements)

References 10 publications

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“…Now the remaining losses are only caused by the piston assembly, journal bearings, valve train and timing drive. In addition to the FMEP data of the auxiliaries, the losses due to the valve train, timing drive, journal bearings and rotary shaft seals are also available to the authors [18, 19]. Consequently, by further subtracting these losses from the base engine FMEP the losses of the piston assembly can be estimated and are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

An experimental study of the load and heat influence from combustion on engine friction

Allmaier

Knauder

Salhofer

et al. 2015

International Journal of Engine Research

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The friction power losses of a turbo-charged heavy-duty diesel engine of the 13 litre class are investigated both by fired engine tests as well as by pressurized motoring tests. During pressurized motoring compressed air is applied to the engine intake which creates loads comparable with fired operation but without the strong and changing thermal influence of combustion. By using this combined approach the influence of the load and the thermal influence of the combustion can be studied separately for the first time. It is found that pressurized motoring yields comparable but generally a bit higher friction power losses as in fired operation. In particular, for full load operation, the agreement between the two methods is very good which supports the reasoning that for full load operation the mechanical load is the dominant factor for the friction power losses. However, for part load operation significant differences arise. Without the thermal influence from combustion, increasing the load on the engine leads to a rather linear increase in the friction power losses as is seen from pressurized motoring. This is in contrast to the fired engine tests, where the friction power losses stay almost constant over a rather large range of part loads and only increase for full load operation. It is argued that the reason for this different behaviour is the thermal impact from combustion.

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Section: Resultsmentioning

confidence: 99%

An experimental study of the load and heat influence from combustion on engine friction

Allmaier

Knauder

Salhofer

et al. 2015

International Journal of Engine Research

Self Cite

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“…In the above eqn. (14), vp are vg are the peripheral velocity which is multiple of the angular velocity and the radius of curvature at any instantaneous contact point.…”

Section: Prediction Of the Performance Factors In Addendum Modified Ementioning

confidence: 99%

“…With the extension of numerical simulation which enables the designers to anticipate the stresses precisely as though in the physical model utilizing the Finite Element Methods (FEM). Thus, contact analysis through FEM attains its fame in estimating the contact stresses on the tooth profile which is a distinctive valuation method applied to transmissions systems [13][14]. The transmission drive will normally require a nonconformal contact together with the sliding and rolling mechanisms in a gear tooth.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of normal contact ratio gearing system through correction factor

Ravivarman¹,

Palaniradja

Sekar

2019

JMES

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As lined, higher transmission ratio drives system will have uneven stresses in the root region of the pinion and wheel. To enrich this agility of uneven stresses in normal-contact ratio (NCR) gearing system, an enhanced system is desirable to be industrialized. To attain this objective, it is proposed to put on the idea of modifying the correction factor in such a manner that the bending strength of the gearing system is improved. In this work, the correction factor is modified in such a way that the stress in the root region is equalized between the pinion and wheel. This equalization of stresses is carried out by providing a correction factor in three circumstances: in pinion; wheel and both the pinion and the wheel. Henceforth performances of this S+, S0 and S- drives are evaluated in finite element analysis (FEA) and compared for balanced root stresses in parallel shaft spur gearing systems. It is seen that the outcomes gained from the modified drive have enhanced performance than the standard drive.

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“…26–29 A similar simulation approach was used in Schaffner et al. 30 in predicting the efficiency of six-speed automotive gearboxes. The present work intends to develop a load share model (LSM) in prediction of the loss factor for a gear drive with balanced bending strength.…”

Section: Introductionmentioning

confidence: 99%

Estimation of loss factor based on the load share model in improved bending strength spur gear drive system

Ravivarman¹,

Sekar

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper demonstrates the prediction of loss factor for non-standard gear drives with equal stresses in the root region of the pinion and wheel. This implementation of equal stresses in the root region is achieved in the described model of a spur gear drive with higher transmission ratio using non-standard rack cutter. The aim is to discover the optimal modification point in the tooth profile by varying values of tooth thickness with at most balanced stresses in the gear pair considered for the study. A loss factor is predicted along the path of contact for a complete meshing cycle using finite element method. This paper studies and compares the distinct models and thereby identifies the suitable and appropriate models. The predicted loss factor includes the distribution of load sharing effect during the meshing which is excluded in the compared models. The gear pair is analyzed, and the loss factor is predicted for influence over the major drive parameters. It was observed that the approach employed facilitate substantial enhancement in the efficiency which is confined by the detailed parametric study and numerical simulation of the balanced stresses in the drive.

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Investigating the efficiency of automotive manual gearboxes by experiment and simulation

Cited by 10 publications

References 10 publications

An experimental study of the load and heat influence from combustion on engine friction

An experimental study of the load and heat influence from combustion on engine friction

Performance enhancement of normal contact ratio gearing system through correction factor

Estimation of loss factor based on the load share model in improved bending strength spur gear drive system

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