Cam Roller Follower Design for Heavy Duty Diesel Engines

Korte, Volker; Glas, Thomas; Lettmann, Markus; Krepulat, Walter; Steinmetz, Christoph

doi:10.4271/2000-01-0525

Cited by 9 publications

(5 citation statements)

References 1 publication

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“…The model presented in this work is a quasi-steady model; therefore, equilibrium values of F bear , e and ϕ are reached at each crank angle, and hence, there is no translatory component (v O = 0) [10]. Taking this into account and replacing Equation (19) in (18), F f r,bear can be finally calculated as:…”

Section: Bearings Friction Lossesmentioning

confidence: 99%

“…The friction level depends on the contact surfaces and lubricating oil properties. Some of the techniques used to reduce the friction are the use of smooth surfaces [12], high oil temperature [13], low viscosity oil [14] and the optimization of components design such as reducing sizes and weights of the piston, bearings and camshaft elements [15], better refinement of the piston rigs surface [16], decreasing the sealing force of the rings [17], using cam roller followers [18], decreasing the loads of valve springs [19] and substituting multiple belts for conventional V-belts [15].…”

Section: Introductionmentioning

confidence: 99%

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A general model to evaluate mechanical losses and auxiliary energy consumption in reciprocating internal combustion engines

Tormos

Martín

Carreño

et al. 2018

Tribology International

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The increasingly stringent internal combustion engines emissions regulations, the extended use of after-treatment systems, the climatic change as consequence of green house gases emissions and the decrease of fossil fuel storages, have moved the research interest towards optimization of the internal combustion engine operation with the aim of reaching the maximum efficiency possible. This renewed interest takes into account the optimization of all the engine subsystems to reduce as much as possible the energy losses. In this framework, the evaluation and optimization of the engine mechanisms and auxiliary systems, aimed at reducing the friction and parasitic energy consumption is one common path to achieve the efficiency targets. This work is devoted to the development of a model to determine the friction losses and the auxiliary energy consumption, based on parameters usually obtained in standard test benches. This model allows the diagnosis of the subsystems behaviour as well as the evaluation of potential improvement by replacing or redesign some parts and components. In this work, a complete description of the models to estimate friction in the piston assembly, bearings and valve train, and energy consumption of the coolant, oil and fuel pump are provided. Finally, a brief application to demonstrate the model potential in diagnosis and predictive applications is discussed.

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Section: Bearings Friction Lossesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A general model to evaluate mechanical losses and auxiliary energy consumption in reciprocating internal combustion engines

Tormos

Martín

Carreño

et al. 2018

Tribology International

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“…The calculated contact ellipse area should be kept within the width of the cam lobe and should not exceed the roller width by more than 10-20%. Roller follower design and durability details were provided by Korte et al (2000).…”

Section: Cam Stress With Roller Followermentioning

confidence: 99%

“…Cam Hertzian stress calculation was discussed in great detail by Turkish (1946), Korte et al (1997Korte et al ( , 2000, and Krepulat et al (2002), regarding different materials' cam stress limits and design guidelines.…”

Section: Introduction Of Cam Stressmentioning

confidence: 99%

Durability and reliability in diesel engine system design

Xin¹

2013

Diesel Engine System Design

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“…In the cam-roller unit, in order to facilitate the installation or prevent the end loading between the roller and cam, the roller needs a certain degree of convexity modification (Figure 1), and optimization of the convexity becomes the key point for lubrication in the contact zone. 12 Sometimes misalignment of the roller against the cam can be found and leads to the tilting or skew of the roller, which inevitably affects stress distribution and lubrication in contact zone. Moreover, due to the motion inertia of the roller and the friction inside the roller bearing there may occur some relative skidding in the cam-roller contact.…”

Section: Introductionmentioning

confidence: 99%

Elastohydrodynamic lubrication analysis of cam-roller pairs of internal combustion engines

Guo

Sun

et al. 2022

International Journal of Engine Research

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Based on the cam-roller pair of an internal combustion engine, a mathematical model of transient thermal elastohydrodynamic lubrication under finite line-contact and the corresponding numerical solver have been established. Under an actual load spectrum and other working parameters from an industry partner, the detailed lubrication performance of the cam-roller pair has been obtained in a cam rotation cycle. Particularly, the influences of the roller convexity, the roller tilting and the skidding between cam and roller on the contact pair lubrication are presented. The lubrication performance of the cam-roller pair depends on the roller convexity markedly, and an optimal roller convexity can effectively reduce the probability of the lubrication film rupture and improve the uniformity of pressure distribution in the contact zone. The roller tilting can worsen the lubrication of the contact zone, and increase the possibility of lubrication failure. If the tilting is taken into consideration at the beginning of the roller convexity design, its negative effect can be effectively alleviated to a certain extent. The skidding results in noticeable increase in temperature and friction coefficient, which can deteriorate the contact zone lubrication. The results provide some theoretical data basis for the lubrication design of cam-roller pairs.

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Cam Roller Follower Design for Heavy Duty Diesel Engines

Cited by 9 publications

References 1 publication

A general model to evaluate mechanical losses and auxiliary energy consumption in reciprocating internal combustion engines

A general model to evaluate mechanical losses and auxiliary energy consumption in reciprocating internal combustion engines

Durability and reliability in diesel engine system design

Elastohydrodynamic lubrication analysis of cam-roller pairs of internal combustion engines

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