Determination of Conditions for Ensuring Reliable Lubrication of Connecting Rod Bearings of Automobile Engines

Kulakov, A. T.; Barylnikova, E.P.; Kalimullin, R. F.

doi:10.25198/2077-7175-2020-3-126

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…Возникший на первом этапе первичный прогиб вкладыша снижает фактическую площадь контакта вкладыша с шатуном, что ухудшает теплоотдачу вкладыша к шатуну, что вызывает его перегрев, возрастание напряжений и деформации на втором этапе [11,12].…”

Section: результаты исследований формоизменения и геометрических пара...unclassified

Study of the process of connecting rod liners’ shape changing in the pre-failure operation period of transport and technological machines and equipment

Kulakov,

Kalimullin

et al. 2023

Tractors and Agricultural Machinery

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BACKGROUND: During the operation of transport and technological machines and equipment, the most frequent failure is loose running of connecting rod liners of a crankshaft. Previous studies on tractor, locomotive and automotive diesel engines did not sufficiently disclose the reasons for loose running of liners. AIMS: Study of the stress-strain state of the steel base of connecting rod liners as the initial and developing factors of the process leading to failure. METHODS: The research is based on the analysis of numerous works devoted to the study of the causes of loose running of connecting rod liners of various internal combustion engines. The methods and results on the operational and bench studies of the stress state and shape changing of connecting rod liners for the KAMAZ-740 (8Ch 12/12) engine obtained by the team of authors are used as the basic data. RESULTS: The process of change in stress state and consequent change in geometric parameters of the steel base, accompanied by change in the shape of connecting rod liners of the KAMAZ-740 engines has been revealed. It is established with the study that the occurrence of failure is not sudden. The process proceeds according to a certain pattern in three stages. The first stage is characterized by the appearance of deformation of a liner due to excessive stress state; the second stage is caused by development of obtained deformations up to critical values; the third stage is loose running of a connecting rod due to obtained deformations and violations of liner’s hydrodynamics conditions. The main result is justification of requirements and conditions for ensuring stability of parameters and shape of liners during long-term operation of engine. CONCLUSIONS: Knowledge of the process leading to the change in shape of crankshaft bearing liners makes it possible to develop design and technological solutions and recommendations to eliminate failures by optimizing the parameters of liners.

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Section: результаты исследований формоизменения и геометрических пара...unclassified

Study of the process of connecting rod liners’ shape changing in the pre-failure operation period of transport and technological machines and equipment

Kulakov,

Kalimullin

et al. 2023

Tractors and Agricultural Machinery

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“…автомобильной промышленности постоянно ужесточаются допуски на изготовление деталей [1][2][3]. Основными ин-струментами, позволяющими обеспечить постоянное улучшение изготовления деталей, являются инструменты APQP-процесса подготовки производства выпуска новых компонентов, тре-В бования к применению которых изложены в ГОСТ Р 51814.6-2005 или в ссылочных руководствах переводных материалов мировых производителей автокомпонентов.…”

Section: Introductionunclassified

Determination of Cutting Transition Parameters in the APQP Pre-production Process of the Engine Camshaft Bearing Housing

Apurin¹,

Kas’yanov²,

Safarov³

2022

Vestnik IzhGTU imeni M.T. Kalashnikova

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An example of the application of the experimental planning method in the APQP pre-production process to find the values of the cutting process parameters that provide a given margin of accuracy is considered on the example of roughing and finishing boring of the inner hole of the camshaft bearing housing. From the total set of geometric parameters, special characteristics are highlighted - the size of the inner hole, which ensures the fit tolerance of the steel-fiber sleeve and the height parameter of roughness Ra, as well as radial runout. The objectives and results of the application of engineering methods (calculation of allowances, dimensional analysis, evaluation of technological accuracy of machine systems, planning experiments) as well as special methods of APQP process (quality management tools - FMEA analysis, SPS, MSA) are considered. Attention is drawn to the insufficient information content of the methods, which does not allow for the selection of process indicators to ensure the necessary margin of accuracy of special characteristics. In order to achieve a given margin of accuracy, technological components of the internal diametrical size are identified - the deviation of the tuning size, the deviation of the cross-section profile and the height roughness parameter Ra, the values of which are found as a result of production experiments. The planning of a full-factor experiment is carried out according to the parameters of the cutting process - cutting speed, feed and cutting depth. To implement the plan, special samples of products with a stepped allowance were designed and manufactured. The shape of the product samples makes it possible to reduce the number of samples for a full-factor experiment from eight to four, providing a check of the linearity of regression models. The calculation and regression models are given, which allow predicting the values of the components of the internal diametrical size at the design stage of the manufacturing operations of parts. The solution of the regression model system that satisfies the specified limitations for a given margin of accuracy allows you to find the optimal range of values of the parameters of the cutting process, to provide rare settings of special characteristics in the serial manufacturing process of camshaft bearing housings. Systematic application of the methodology, along with statistical methods of quality management, allows monitoring the technical condition of equipment and maintaining it in the condition required for the production of quality products. Systematic application of the methodology, along with statistical methods of quality management, allows monitoring the technical condition of equipment and maintaining it in the condition required for the production of quality products.

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Determination of Conditions for Ensuring Reliable Lubrication of Connecting Rod Bearings of Automobile Engines

Cited by 2 publications

References 7 publications

Study of the process of connecting rod liners’ shape changing in the pre-failure operation period of transport and technological machines and equipment

Study of the process of connecting rod liners’ shape changing in the pre-failure operation period of transport and technological machines and equipment

Determination of Cutting Transition Parameters in the APQP Pre-production Process of the Engine Camshaft Bearing Housing

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