A Valve Train Friction and Lubrication Analysis Model and Its Application in a Cam/Tappet Wear Study

Yang, Lisheng; Ito, Akemi; Negishi, Hideo

doi:10.4271/962030

Cited by 20 publications

(16 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The maximum cam surface temperature strongly correlates to the location of cam wear (Yang et al, 1996). Cam flash (or surface) temperature calculation needs to be included in cam design and durability analysis for flat-faced followers.…”

Section: Cam Flash Temperaturementioning

confidence: 99%

“…The entraining velocity largely determines the effectiveness of the elastohydrodynamic lubrication. Yang et al (1996) developed a lubrication and surface temperature model based on the flash temperature concept for a cam with a flat-faced follower. They indicated that only calculating the oil film thickness and the maximum Hertizain stress is not sufficient to explain or predict the cam wear pattern observed from their experiments.…”

Section: Cam Wear Modelingmentioning

confidence: 99%

See 1 more Smart Citation

Durability and reliability in diesel engine system design

Xin¹

2013

Diesel Engine System Design

View full text Add to dashboard Cite

Section: Cam Flash Temperaturementioning

confidence: 99%

Section: Cam Wear Modelingmentioning

confidence: 99%

Durability and reliability in diesel engine system design

Xin¹

2013

Diesel Engine System Design

View full text Add to dashboard Cite

“…Some contact parameters are established based on the data given in the studies by Teodorescu et al 13 and Yang et al 14 More information about the contact model of cam and tappet can be seen in the study by Guo et al 15 …”

Section: Contact Model Of Cam-tappetmentioning

confidence: 99%

“…The friction force F CT is due to two different mechanisms, the asperity contact (boundary component F b ) and the shear of lubricant (hydrodynamic component F v ). 4,13,14 As a result, the friction force F CT is the sum of the two different components…”

mentioning

confidence: 99%

Modeling and analysis of the transient vibration of camshaft in multi-cylinder diesel engine

Guo

Zhang

2015

Advances in Mechanical Engineering

View full text Add to dashboard Cite

The dynamics and vibrations of camshaft excited by multi-follower elements are modeled and analyzed. A pushrod valve train system from a four-cylinder diesel engine is selected as the case study. The camshaft is modeled to analyze the interactions of multi-follower elements. Both the camshaft angular vibration and bending vibration are taken into consideration. Each follower element is simplified as a multi-mass system. The lumped masses are connected by the spring elements and the damping elements. The contact force model at the cam-tappet interfaces was developed based on the elasto-hydrodynamic lubrication theory of finite line conjunction. From the analysis results, it can be seen that the bending vibration of camshaft is mainly in the normal direction at the cam-tappet interfaces. Moreover, the bending vibration is mainly influenced by the overlapping of inlet cam function and exhaust cam function of each cylinder. The angular vibration of camshaft mainly focuses at the fundamental frequency and the harmonic frequency corresponding to the cylinder number.

show abstract

“…The angular velocity is computed by numerically integrating the angular acceleration obtained from equation (21).…”

Section: Tappet Spinmentioning

confidence: 99%

Combined multi-body dynamics and experimental investigation for determination of the cam-flat tappet contact condition

Teodorescu

Taraza

2004

Proceedings of the Institution of Mechanical Engineers, Part K:

View full text Add to dashboard Cite

The paper investigates the tribological contact conditions between a polynomial automotive cam and a flat follower. A multi-body model of the system is presented to take into account the complex tappet motions. A set of such models is presented in order to predict the cam -tappet friction force, the tappet -tappet bore friction force and the resulting tappet spin. The tribological conditions giving rise to these kinetic actions include the elastohydrodynamic regime of lubrication in the concentrated camfollower contact and a mix of hydrodynamic and boundary friction action in the tappet -tappet bore contact. While boundary friction dominates the tappet -tappet bore friction at low engine speeds, for high engine speeds the boundary friction dominates the closing event of the cam, and hydrodynamic and mixed lubrication dominate the opening event of the cam. The simplified friction models are experimentally validated on a single-cylinder diesel engine. The measuring techniques are based on a redesigned engine tappet equipped with four strain gauge bridges.

show abstract

A Valve Train Friction and Lubrication Analysis Model and Its Application in a Cam/Tappet Wear Study

Cited by 20 publications

References 12 publications

Durability and reliability in diesel engine system design

Durability and reliability in diesel engine system design

Modeling and analysis of the transient vibration of camshaft in multi-cylinder diesel engine

Combined multi-body dynamics and experimental investigation for determination of the cam-flat tappet contact condition

Contact Info

Product

Resources

About