Improving reliability of crankshafts of automotive engines

2021 ◽  
Keyword(s):  
Technological Process ◽  
Diesel Engines ◽  
Operating Time ◽  
Operational Reliability ◽  
Failure Frequency ◽  
Automotive Engines ◽  
Factors Influencing

The article considers the factors influencing the reliability of crankshafts. Analysis of engine complaints was carried out, schedule of change of failure frequency depending on operating time was built. The purpose of the work is to solve the problem of improving the operational reliability of the crankshafts of KAMAZ diesel engines by improving the technological process of manufacturing and processing the crankshaft. Keywords reliability, crankshaft, hardness, complaint analysis

IMPROVEMENT OF THE TECHNOLOGICAL PROCESS AND OIL COMPOSITION FOR BENCH RUN-IN OF THOROUGHLY REPAIRED AUTOMOTIVE ENGINES

2020 ◽  
Vol 15 (3) ◽  
pp. 368-377
Author(s):  
Valery Ostrikov ◽  
◽  
Valentin Safonov ◽  
Alla Zabrodskaya ◽  
Konstantin Safonov ◽  
...  
Keyword(s):  
Technological Process ◽  
Oil Composition ◽  
Automotive Engines

Development of a Technological Process and Composition of Flushing Oil for Diesel Engines

2018 ◽  
Vol 54 (1) ◽  
pp. 24-28
Author(s):  
V. V. Ostrikov ◽  
V. I. Vigdorovich ◽  
V. V. Safonov ◽  
A. P. Kartoshkin
Keyword(s):  
Technological Process ◽  
Diesel Engines

scholarly journals Reliability and maintainability of scraper conveyor used in coal mining in the Jiu Valley

2021 ◽  
Vol 15 (3) ◽  
pp. 16-21
Author(s):  
Vlad Alexandru Florea ◽  
Dragos Pasculescu ◽  
Vlad Mihai Pasculescu
Keyword(s):  
Operating Time ◽  
Electrical Equipment ◽  
Operational Reliability ◽  
Underground Mines ◽  
Distribution Law ◽  
Mean Time Between Failures ◽  
Operation Conditions ◽  
Time Between Failures ◽  
Scraper Conveyor ◽  
Mean Time

Purpose.The aim of the study is to determine and analyse causes of faults in the operation of TR-7A scraper conveyor and to estimate the required time for their remediation and select the methods of their prevention and elimination. Methods. The characteristic of a system, such as the scraper conveyor, intended to fulfil its specified function in time and operation conditions, can be studied, theoretically, by determining its operational reliability. This implies the existence of a framework that incorporates several interconnected components of technical, operational, commercial and management nature. The quantitative expression of reliability was based on elements of mathematical probability theory and statistics (exponential distribution law), failure and repair mechanism not being subject to certain laws. Findings. The following TR-7A subassemblies, if defective, could have been the cause of a failure: chains, hydraulic couplings, chain lifters, drive, return drums, some electrical equipment. After 28 months of monitoring the TR-7A operation, we have established the number of failures (defects) ni, the operating time between failures ti, frequency of failures fc, time to repair tri, weight repair time pr, mean time between failures (MTBF), mean time to repair (MTR). Originality.Data collection and processing involves the adoption of specific procedures to allow the correct highlighting of the causes and frequency of failures. The accomplishment of this approach allowed finding the solutions for increasing reliability of some subassemblies of TR-7A conveyor (i.e., those subjected to abrasive wear). Practical implications.One solution was to use materials with compositional and functional gradient in the case of worn surfaces of some subassemblies. It was successfully applied for the chain lifters where a significant increase in the mean time between failures was obtained. The field of application of these materials can be extended to the metal subassemblies of machines and equipment with abrasion wear that occurs both in underground mines and in quarries.

scholarly journals Identifying the Issue of Reducing the Emission of Harmful Compounds in the Exhaust Gas from Marine Main Engines and Description of the Emission Process of These Compounds in Probabilistic Approach

2017 ◽  
Vol 24 (2) ◽  
pp. 89-95 ◽  
Author(s):  
Zbigniew Łosiewicz
Keyword(s):  
Markov Process ◽  
Diesel Engines ◽  
Probabilistic Approach ◽  
Operating Time ◽  
Exhaust Gas ◽  
Maximum Mass ◽  
Marine Engine ◽  
Emission Process ◽  
Semi Markov Process ◽  
Harmful Substances

Abstract The article discusses the results of actions performed by marine engine manufacturers towards the reduction of emission of harmful substances in the exhaust gas from these engines. The discussion is limited to main engines produced by MAN B&W. A model is proposed to describe the process of emission of harmful substances from Diesel engines based on the semi-Markov process, discrete in states and continuous in the operating time. The states of this process are: engine ability state (s1) and engine inability state (s2). A method to calculate probabilities P1 and P2 of the appearance of states s1 and s2 is proposed. State s1 is interpreted as corresponding to the inequality ek<ek(dop), while state s2 is characterised by the inequality ek>ek(dop), where ek represents the mass of harmful substances emitted by the engine during its operation and ek(dop) is the maximum mass of emission of these substances permitted by relevant regulations.

Some Factors Influencing Cylinder Head Gasket Problems and Design

1973 ◽  
Vol 187 (1) ◽  
pp. 43-49
Author(s):  
M. G. Herrington
Keyword(s):  
Cast Iron ◽  
Diesel Engines ◽  
Cylinder Head ◽  
Cylinder Block ◽  
Temperature Variations ◽  
Factors Influencing ◽  
Test Conditions ◽  
Cylinder Head Gasket ◽  
Block Face

The environment under which a cylinder-head gasket has to function is reviewed and a typical cylinder head to cylinder block assembly is considered, outlining the temperature variations in the inlet and exhaust ports. Curves showing head-face to block-face movement for varying engine speeds and coolant temperatures are reviewed with power units running at accelerated gasket destruction test conditions. Comparisons are made between cast-iron block and aluminium head and cast-iron head and block for both petrol and diesel engines.

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