Friction Tests of Ball Bearings with Comparison of Lubricants
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The ball bearings are the rotating components which are widely spread to moving parts for all machinery operation in general industry. This paper presents the ball bearing resistance tool which has a proper size and can handle the maximum load of 300 kg by using an electric power. The ball bearing resistance tool was used to test the bearings No. 6011 cm. The series of tests was performed in the ball bearings lubricated; engine oil SAE 10W/40, auto transmission fluid Dexron, and hydraulic oil. The rotational speeds for testing were vary; 500, 600 and 700 rpm respectively. At each speed, there were various weight; 50, 70, 90,110,130,150, and 170 kg respectively. The results show that the hydraulic oil generated the smallest coefficients of friction and energy efficiency for ball bearing operation.Keywords:
Ball bearing
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Hydraulic fluid
Friction torque
On the cantilever EBZ160 boom-type roadheader hydraulic system and the structural characteristics of technical performance.The hydraulic system was introduced.Analyze the hydraulic system of regular inspections and daily content.In particular,the hydraulic system of hydraulic oil in the selection of standards,inspection methods and the hydraulic fluid replacement solutions to the problem of maintenance of the hydraulic system.
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This essay simply analyses the problems in hydraulic system and hydraulic oil management based on the actual condition of old ships and concludes some practical measures in order to offer reference for further study.
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The paper introduces a new type control and prevention system for the pollution of the hydraulic system.The system consists of the body, gasbag, and control valve with sensor or without sensor, and is con- nected with the vent valve belonged to the oil tank of the hydraulic system by the pipeline, the press in the oil tank of the hydraulic system could be regulated by contraction and expansion of the gasbag, which effectively isolates the contact between the oil in the tank and the air, decreases the pollution to the hydraulic system, increases the reliabi- lity of the hydraulic system
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The data home and abroad shows that 70 to 80 percent faults of hydraulic systems are due to oil pollution. Combining with the environment of the hydraulic equipment works, this paper describes the cause of oil pollution of hydraulic equipments on board ship and discusses the pollution influence on the operation of hydraulic system. Then it analyzes how to control oil pollution and to prevent faults in the course of using and managing hydraulic system. [
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The hydraulic system is composed of hydraulic motor,hydraulic pump,hydraulic component and hydraulic oil.The hydraulic oil plays the most important role in it. According to the advantages of operating smoothly and controlling easily, the hydraulic technology is applied in broad field.Along with the continuous development of the hydraulic oil specifications,the high performance cleanness hydraulic oils,multigrade hydraulic oils and environment acceptable hydraulic oils can meet the market requirements.
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This paper introduces a super high-pressure hydraulic system and the pressurizing and reducing fluid flux instrument of the system, and it also discusses the influence of hydraulic oil viscosity in the system. This is of important value to choose the type of the hydraulic oil in the super high pressure hydraulic system.
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