No.1011 2013小型・軽量化関連技術特集号 数式モデルによる自動変速機用油圧ポンプの各種効率に関する解析 |
| カテゴリー | 論文 |
|---|---|
| 筆者 | 自動車部品事業本部 油圧システム技術部 吉田尚仁 稲熊義治 |
| 要旨 | This paper deals with a mathematical analysis of pump effi ciencies in an internal gear and a balanced vane pumps. They are commonly used in current automatic transmissions including a continuously variable transmission. For these pumps, the infl uence of oil temperature as well as pump-operating pressures and pump speeds is clarified by using mathematical models taking oil temperature into consideration, which are constructed on the basis of actual measured fl ow and torque data under various pump-operating conditions. For fuel economy in a vehicle, because the pump should be operated under conditions to obtain higher pump effi ciencies, it is very important to understand the relationship between the pump efficiencies and the pump-operating conditions. This paper reveals that the mathematical models representing the leakage flow and friction torque characteristics accurately is helpful to investigate the pump efficiencies as well as the flow and torque performance under various pump-operating conditions. As a result, the overall efficiency decreases at extremely low and high oil temperatures. In the internal gear and the balanced vane pumps tested in this work, the region with a higher overall effi ciency lies around an oil temperature of 80℃ . |
| キーワード | fluid power system, hydraulic pump, leakage flow, friction torque, pump efficiency, mathematical model |
| 関連タグ |
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