Steuertriebefür Verbrennungsmotoren

Belmer, Stefan; Fink, Thomas; Lorenz, Ingolf; Neukirchner, Heiko

doi:10.1007/bf03226749

Cited by 11 publications

(4 citation statements)

References 1 publication

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“…As was mentioned, according to [3], the timing drive and valve train generate approx. 20% of overall engine friction losses depending on the engine speed.…”

Section: Determination Of Changes In Engine Emissionsmentioning

confidence: 99%

Changes in Total Friction in the Engine, Friction in Timing Chain Transmissions and Engine Emissions Due to Adding TiO2 Nanoparticles to Engine Oil

Woźniak

Batory

Siczek

et al. 2020

Emiss. Control Sci. Technol.

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The main aim of the study was to evaluate changes in total friction in the engine, friction in its timing chain transmissions and engine emissions resulting from adding TiO 2 nanoparticles to engine oil. The applicable engine oils and factors affecting their features were discussed. The drive from the crankshaft to the camshaft in an internal combustion engine is usually carried out by means of a cogged belt transmission or a chain transmission when high mileage is required without service operations. The engine performance of analyzed SI engine was obtained from the literature. The dependency of engine emission on engine operating speed was obtained using data from tests of a very similar engine under standard test conditions described in the literature. The changes in engine characteristics caused by varying internal friction conditions were estimated using the engine performance characteristic and engine friction losses, particularly in valve train chain transmission. The friction in such a chain transmission operating under oil lubrication conditions can be determined using its analytical model and measured friction torque occurring between the chain rollers and the pins. The analytical model was developed using the finite element method and additional mathematical formulas. The proposed model allowed obtaining weight and mass inertial moments of all valve train transmission components. The friction torque in contact zone chain roller-pin was obtained using the elaborated physical pendulum method for different conditions of lubrication, namely, without oil, with pure engine oil, and with engine oil containing TiO 2 nanoparticles. The engine oil SAE 10W-40 with/without dispersed 2% wt. TiO 2 nanoparticles was used during tests. The preparation process of studied oils was described. The resulted values of the friction torque in the chain transmission operating in different conditions of lubrication and changes in engine emission have been presented for tests before and after addition of TiO2 nanoparticles into engine oil. During the measurements it was observed that the addition of 2% TiO2 nanoparticles into engine oil reduced the total friction losses by 7-7.7%. Additionally, it was demonstrated that the timing drive and valve train generate about 14.4-18% of overall engine friction losses. Based on the results obtained from a comparative analysis of emission in the other engine with similar power characteristics, the mentioned total friction losses can change the emission of the following compounds in the analyzed SI engine: 17-19% for CO, 8-9% for CO 2 , 13-17% for NO x , and 12-16% for HC. Such changes were dependent on the engine speed. The smallest changes in engine were registered for the rotation speed of 2500 rpm. The oil consumption in the engine and its impact on the PM emission was estimated. The additional arrangements facilitating the extrapolation of the obtained friction results to the cases of using other oils and the method of measuring the PM emission on the test stand were proposed.

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“…As was mentioned, according to [3], the timing drive and valve train generate approx. 20% of overall engine friction losses depending on the engine speed.…”

Section: Determination Of Changes In Engine Emissionsmentioning

confidence: 99%

Changes in Total Friction in the Engine, Friction in Timing Chain Transmissions and Engine Emissions Due to Adding TiO2 Nanoparticles to Engine Oil

Woźniak

Batory

Siczek

et al. 2020

Emiss. Control Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…There are different approaches trying to reduce friction between automotive engine components, one of which is presented by [2], within there are considered different materials, surface treatments and surface coatings of engine timing chain transmissions. Chain transmissions due to their properties of high power and torque transmission, are used more often as component of internal combustion engine's timing system [3].…”

Section: Introductionmentioning

confidence: 99%

Geometry of silent chain - involute sprocket

2018

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Silent chains tend to have more and more usage in automotive industry. The study of these types of chains has a lot to consider due to the fact that silent chains are not standardized yet. The aim of this paper is to study and analyse the theoretical contact point between a silent chain’s toothed plate and an involute sprocket. Varying different parameters of the chain and sprocket, there will be studied its effects on the theoretical contact point and the sprocket’s profile geometry.

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“…Timing chain transmissions are used more and more in combustion engines. Their robustness ensures the transmission of higher power, respectively higher torque for a longer maintenance-free period aggregate, [2].…”

Section: Introductionmentioning

confidence: 99%

The influence of profile angle on forces distribution on silent chain transmissions

2018

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The aim of this paper is to define and to analyze the theoretical contact forces that appear in a sprocket -silent chain joint. The contact force between the links and the teeth flanks of the sprocket can be considered as a reaction to the axial force (tensioning force) transmitted throughout the pins. The centrifugal force is considered to be constant and the friction between the elements is not considered. This paper is presenting the steps to obtain the relationships for the forces from the sprocket-link contact depending on the tensioning force component between the links and the centrifugal force. These forces are computed in order to establish their distribution on links.

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Steuertriebefür Verbrennungsmotoren

Cited by 11 publications

References 1 publication

Changes in Total Friction in the Engine, Friction in Timing Chain Transmissions and Engine Emissions Due to Adding TiO2 Nanoparticles to Engine Oil

Changes in Total Friction in the Engine, Friction in Timing Chain Transmissions and Engine Emissions Due to Adding TiO2 Nanoparticles to Engine Oil

Geometry of silent chain - involute sprocket

The influence of profile angle on forces distribution on silent chain transmissions

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