Development of a Low Friction Chain Drive System for Gasoline Engines

Baek, Hong-kil; Kang, H.I.

doi:10.4271/2012-01-1752

Cited by 3 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At the same time, there was excessive friction loss between the chain and tensioner blade, this means the transmission efficiency of the chain drive was suboptimal. Related research 12,24,28 shows that, the mismatch between chain and appurtenances would cause abnormal wear, this would somehow cause abnormal sound.…”

Section: Dynamics Simulation Of the Timing Chain Systemmentioning

confidence: 99%

Sound & vibration control for a single-cylinder gasoline engine based on parameter optimization of timing-chain system

Hou

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

In order to promote the idling noise quality of a single-cylinder gasoline engine, this paper addresses sound source identification and noise control research. The noise was identified by the application of subjective evaluation, acoustic spectrum and sound intensity analysis. It was found that the noise was caused by the anomalous dynamic performance of the timing system under idling conditions. Furthermore, sound and vibration characteristics of timing system were improved by design methodology research of key components. A multi-body dynamic model was established to characterize dynamic characteristics of the timing system under idling conditions. The key factor of producing noise was that the fluctuation of contact force between the chain and guide and transverse displacement of the chain were much higher than those of the allowable design limit. For the lowest design alternation and manufacturing costs, the work analyzed six timing system improvement schemes obtained by cross combination of tensioner blade line and guide strip radian parameters. After that, the optimal design scheme which could improve dynamic performance parameters of the timing system was derived. The design scheme was conducted with a acoustic test of engine to derive the following results. The noise level of a single-cylinder engine under idling conditions decreased by 3 dB(A). The abnormal noise of the original engine was eliminated under subjective evaluation. The sound quality under other working conditions had no apparent deterioration. Research shows that guide and tensioner blade line optimization design could improve dynamic performance of the timing chain system to eliminate abnormal noise, thereby significantly improving the acoustic characteristic of a single-cylinder engine.

show abstract

Section: Dynamics Simulation Of the Timing Chain Systemmentioning

confidence: 99%

Sound & vibration control for a single-cylinder gasoline engine based on parameter optimization of timing-chain system

Hou

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…One of the decisive tribological systems within the machine element chain is the contact between pin and bush, that may cause 28% up to 45% of the overall energy losses of an entire chain drive [14,15]. In addition to the contact surfaces of the chain components, this consists of the surrounding media such as the lubricant [16].…”

Section: Introductionmentioning

confidence: 99%

Precise Friction Measurement in Drive Chains Using a Chain Joint Tribometer

2021

View full text Add to dashboard Cite

For high performance racing applications as well as to achieve global emission goals, the efficiency of chain drives in vehicles is of great importance. In previous studies research on drive chains for motorcycle transmissions and timing drives of combustion engines is done with regard to efficiency and wear of the entire drive trains. Hence a test rig, the chain joint tribometer, was built. That enables to do wear and friction research on all parts inside of a chain joint like pin and bush. In conventional test rigs for efficiency investigation in circulation mode, the effects of different friction contact points overlap. So, research on the tribological system "chain joint contact" is in the focus. This rig can represent arbitrary load curves, in particular the contact force and the relative motion of a real chain drive. The chain joint tribometer closes the gap between investigations on whole chain drives standard tribometer tests. In this paper, results of friction analysis using drive chain segments in the arrangement of serial production are presented. Differences are distinguished between different chains having deviating surface roughnesses, which proves that the used tribometer is an adequate setup to analyze drive chains with regard to friction.

show abstract

Reduction of Friction Loss by Arrangement of the Segment of the Polyimide Arms & Guides for Timing Chains in Automobile Engines

Ito,

Sekiguchi,

Maruyama

et al. 2024

Tribology Online

View full text Add to dashboard Cite

The world cannot counter climate change without the automobile industry becoming far more environmentally sustainable than it is today. With the realization that electrified mobility will take decades, not years, and that internal combustion engines (ICE) will continue to power vehicles in the near future, we need to step up the focus on improving fuel efficiency of ICE vehicles. In this report, we have confirmed that, in timing chains for automobile engines, the sliding area can be reduced by changing the arrangement of the arms & guides from continuous contact to a segmented one and by using an aromatic polyimide (PI) that can withstand the high contact surface pressure, thereby reducing friction loss. Through bench test monitoring, we confirmed that the friction loss was reduced in comparison to that by the conventional arms & guides in ICEs. The conventional arms & guides in the layout of the timing chains are placed with a curvature of ~ R2000 mm (at least R500 mm). In this study, the layout of the arms & guides was investigated. Each arm or guide is divided into two or three segments in the direction of travel and each curvature is reduced to about R100 mm. In addition, the material has been changed from polyamide (PA66) to PI. By these changes, the contact surface is decreased, and the surface pressure is increased. This means that on the Stribeck diagram, the lubrication conditions move in the direction of the smaller Sommerfeld number and the friction loss decreases. The use of the high compressive modulus material reduces the amount of deformation of the arms & guides contact surface, leading to the reduction of the friction loss.

show abstract

Development of a Low Friction Chain Drive System for Gasoline Engines

Cited by 3 publications

References 3 publications

Sound & vibration control for a single-cylinder gasoline engine based on parameter optimization of timing-chain system

Sound & vibration control for a single-cylinder gasoline engine based on parameter optimization of timing-chain system

Precise Friction Measurement in Drive Chains Using a Chain Joint Tribometer

Reduction of Friction Loss by Arrangement of the Segment of the Polyimide Arms & Guides for Timing Chains in Automobile Engines

Contact Info

Product

Resources

About