A Study on Cam Wear Mechanism with a Newly Developed Friction Measurement Apparatus

Ito, Akemi; Yang, Lisheng; Negishi, Hideo

doi:10.4271/982663

Cited by 10 publications

(9 citation statements)

References 2 publications

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“…Ito et al [8] studied the friction with the use of two strain gauges mounted on a push rod and shaft. Using both the deformation on the shaft and the force on the tappet, the friction coefficient was evaluated with a good degree of accuracy.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, for improved engine efficiency, research into this tribopair is necessary. Accordingly, numerous authors have designed and used valve train rigs to study friction [3][4][5][6][7], wear [8][9][10], film thickness [11][12][13][14] and tribochemistry [15,16] at the cam tappet contact. Historically speaking, Dyson and Naylor [3] were perhaps the first to investigate friction at the cam follower interface using a push rod assembly where the tappets were held in place by a pair of flat springs, and the corresponding stresses measured by means of piezo electric gauges.…”

Section: Introductionmentioning

confidence: 99%

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Development of valve train rig for assessment of cam/follower tribochemistry

Ofune

Banks

Morina

et al. 2016

Tribology International

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Component bench tests are a crucial part of a tribology assessment experimental programme for most engines and subsystems. This is because they test the components under conditions simulating the operating characteristics of the system. These have become very important as they shed more light into the friction, wear, lubrication and importantly for this study, the tribochemistry of valve train systems. This work outlines the procedure for the development of a single cam rig (SCR) from a 1.25L FORD Zetec (SE) engine. Friction plots were used to validate the data obtained from the newly developed single cam rig with Mn-phosphate coated and polished follower against a cast iron camshaft. The tribofilm formed using normal and mid Sulphated Ash, Phosphorus and Sulphur (SAPS) 5W-30 oils were evaluated and correlated to the friction and wear properties of the tribopair.Raman and FIB-SEM/EDX investigations of the tribochemical films showed that the normal SAPS oil produced patchy, thick (80-100 nm) and well dispersed tribofilm with better wear prevention capabilities. It was observed that Mid SAPS oil had lower wear prevention due to loosely dispersed and thin tribofilms. Absence of tribofilms at the centre of the insert with this oil also suggests that formation and removal processes are an integral part of the wear mechanisms in highly loaded cam follower systems.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of valve train rig for assessment of cam/follower tribochemistry

Ofune

Banks

Morina

et al. 2016

Tribology International

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“…Cam wear mechanism was experimentally researched by Ito et al (1998) by using friction and wear measurement. They found that the cam wear was confined across the cam nose within the region between the two locations having the theoretical minimum (zero) oil film thickness which corresponded to theoretical zero entraining velocity.…”

Section: Cam Wear Mechanismsmentioning

confidence: 99%

Durability and reliability in diesel engine system design

Xin¹

2013

Diesel Engine System Design

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“…Most of the test rigs built for friction study used the original engine cylinder head with the camshaft-driven electrically [3]. Extensively modified rigs have also been used to understand the friction performance [1,[4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental technique for evaluating valve train performance of a heavy duty diesel engine

Mufti

2009

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this research work, new experimental systems have been developed that allow measurements of a number of parameters vital for evaluating the cam/tappet interface. One of the main reasons for developing these techniques was to allow the study of the cam/tappet interaction in its original environment. The experimental system developed allows the first time measurement of cam/tappet friction on a gear-driven pushrod valve train configuration. With the help of a recently developed new technique for measuring tappet rotation, the tappet speed can also be measured along with the oil film thickness at the cam/tappet interface using the capacitance technique. All the three main parameters -friction, oil film thickness, and tappet rotation -have been measured for a range of engine conditions and lubricant types. The experimental techniques used were developed in such a way that the modifications had no detrimental effect on the cam/tappet performance.The performance evaluation of the engine valve train was carried out using three lubricants: SAE 50, SAE 5W-40, and SAE 0W-30. The tests showed the benefit of viscous oil in reducing cam/follower friction, but an adverse effect was observed regarding camshaft bearing friction. The effect of engine speed on the valve train friction was also observed, reducing friction with increasing engine speed. The oil film thickness at the cam/follower interface and the tappet rotation speed also changed with the change in oil viscosity and engine speed. All the three parameters -friction, oil film thickness, and tappet rotation -were measured simultaneously synchronized with the engine crank angle.

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A Study on Cam Wear Mechanism with a Newly Developed Friction Measurement Apparatus

Cited by 10 publications

References 2 publications

Development of valve train rig for assessment of cam/follower tribochemistry

Development of valve train rig for assessment of cam/follower tribochemistry

Durability and reliability in diesel engine system design

Experimental technique for evaluating valve train performance of a heavy duty diesel engine

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