Experimental Investigation Into the Dynamic Engine Timing Chain Behaviour

Weber, Carsten; Herrmann, W.; Stadtmann, J.

doi:10.4271/980840

Cited by 11 publications

(6 citation statements)

References 2 publications

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“…Timing chains are often tested in engines without combustion to determine noise levels, friction losses, or wear. The automotive industry often uses such tests and its supplier industry [16], [17], [20], [27], as well as by universities and research institutes [25], [26], because they can provide important information about friction losses, wear, vibrations and noise in the engine. Although the amplitude of the load on the chain without combustion is smaller, the forces acting on the chain during one revolution are close to real operation.…”

Section: Cold Engine Dynamometer Testsmentioning

confidence: 99%

“…Although the amplitude of the load on the chain without combustion is smaller, the forces acting on the chain during one revolution are close to real operation. The only significant difference is the excitations originating from combustion events [27]. Consequently, this method is suitable for comparing different chains and oil qualities in a given engine.…”

Section: Cold Engine Dynamometer Testsmentioning

confidence: 99%

See 1 more Smart Citation

Timing chain wear investigation methods: Review

Paulovics¹,

Rohde-Brandenburger²,

Tóth-Nagy³

2022

FME Transactions

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Several methods are used for investigating timing chain wear, from fired engine dynamometer tests through tribological model tests to simulations. Research over the past decade has shown that component or tribometer tests can replace expensive engine dynamometer tests in many cases. Simulation methods can further reduce the cost and time of development. Simulation models require experimentally defined input parameters; therefore, experiment-based methods cannot be completely avoided. However, a comprehensive comparison or validation of the various experimental and simulation techniques is difficult, as the literature on the topic is relatively scarce. This study aims to give a systematic comparison of the results of several investigation methods of timing chain wear, supported by data measured at Széchenyi István University, such as fired engine dynamometer tests, cold dynamometer tests, component tests, and tribometer tests, presenting their benefits and limitations, where possible through examples and results. The study also provides an insight into the compatibility of different measurement methods.

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Section: Cold Engine Dynamometer Testsmentioning

confidence: 99%

Section: Cold Engine Dynamometer Testsmentioning

confidence: 99%

Timing chain wear investigation methods: Review

Paulovics¹,

Rohde-Brandenburger²,

Tóth-Nagy³

2022

FME Transactions

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show abstract

“…Weber et al [78] developed the new test method to facilitate the direct measurement of the real timing chain load under the engine conditions. The measuring principle was based on a strain gauged chain link in combination with a telemetric transducer system.…”

Section: Tribological Aspects Of the Chain Transmissionmentioning

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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“…Weber et al [26], developed the new test method to facilitate the direct measurement of the real timing chain load under all engine conditions. The measuring principle was based on a strain gauged chain link in combination with a telemetric transducer system.…”

Section: Tribological Aspects Of the Chain Transmissionmentioning

confidence: 99%

The effect of SiO2 nanoparticles content in engine oil on tribological properties of valvetrain chain transmission components

Spinache¹,

Trandafir²,

Diaconu³

et al. 2019

Combustion Engines

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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 millage is required without service operations. The valvetrains in CI engines sometimes use the gear transmissions, and the historical rather bevel gear can be found in old cars of collectors or in some motorcycle engines. The chain gear used in SI engines has a two- or three-row chain with high strength, due the unevenness of loads that additionally induce chain pulling and valve timing deregulation. The chain transmission requires the use of pre-tensioners, usually self-acting and driven by springs or oil pressure. The vibrations and chain runout are limited using plastic guides placed on the outside of the long straight sections of the chain. The model of the chain transmission developed with the use of the Finite Elements Method, which operates under oil lubrication conditions, was analyzed. Such the model allowed obtaining weight and mass inertial moments of components. The aim of the study was to evaluate the effect of SiO2 nanoparticles content in engine oil on the friction between chain transmission components. The resulted values of the friction torque in the chain transmission operating in different conditions of lubrication have been presented in the paper.

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Experimental Investigation Into the Dynamic Engine Timing Chain Behaviour

Cited by 11 publications

References 2 publications

Timing chain wear investigation methods: Review

Timing chain wear investigation methods: Review

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

The effect of SiO2 nanoparticles content in engine oil on tribological properties of valvetrain chain transmission components

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