Implementation and Improvement of the Cooling System of Hydraulic Brake

• Main Authors: Yuan-Hong Wong, 翁原鴻
• Other Authors: Gwo-Jen Chiou
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/9m5syt

碩士 === 國立虎尾科技大學 === 電機工程系碩士在職專班 === 105 === This thesis is based on the study of cooling system of the closed type hydraulic brake. The closed type hydraulic brake adopts the closed type circulation tube, which runs by the gear pump to generate positive and negative pressure to produce circulation oil flow. However, after running in a long period of time, the gear pump generates heat energy and results in the temperature rise of circulation oil, in addition, the rising temperature will reduce the viscosity of circulation oil, causing damage to the oil film and increasing friction drag of machine parts. These will also give rise to the change of the clearances of gears and the volume of gear pump, In this situation, the circulation oil flow will be obstructed, which will produce extreme high pressure and partial vacuum, and most importantly, the air pocket phenomenon. The fore-mentioned factors would cause various problems, such as increasing vibration of gear pump and leakages of circulation oil, unbalanced axle center, malfunction, reducing the efficiency of hydraulic system, and acidity of circulation oil that will even made the whole equipment been corroded. Therefore, this thesis focus on solving the problem of overheating in hydraulic brake system, by applying the heat conduction and heat convection principle to reduce the temperature of circulation oil more efficiently. In the experiments of five different types of cooling system, which are “heat energy reduce” cooling system, “iced-water” cooling system, “air-cooled” cooling system, “water-cooled” cooling system and natural heat dissipation. For cooling effectiveness, it shows that the water circulation cooling system is obviously superior to the situation under natural heat dissipation. This thesis takes natural heat dissipation as a comparison basis, For the temperature of oil circulation, “heat energy reduce” cooling system dropped by 27.6, “iced-water” cooling system dropped by 9.3, “air-cooled” cooling system dropped by 4.8, and “water-cooled” cooling system dropped by 3.5. On the other hand, for the temperature of gear pump, “heat energy reduce” cooling system dropped by 4.5, “iced-water” cooling system dropped by 8.9, “air-cooled” cooling system dropped by 3.8, and “water-cooled” cooling system dropped by 3.2. In conclusion, the “iced-water” cooling system is the most efficient system. However, there are apparent disadvantages. For example, it needs more space to place the compressor, higher costs and electricity consumption. On the other hand, the “heat energy reduce” requires fewer installation space, lower costs and energy consumption. Therefore, it achieves highest economic benefits and will be in widespread use.