由于水的比热高，并且在零件与冷却介质间有良好的传热性能，因此现代汽车发动机大多采用水冷却。采用水作为冷却介质的发动机称为水冷发动机。冷却液也就是水，由水泵输送，流过发动机和水散热器。在汽车行驶时，利用迎风气流或通过风扇强制冷却流过散热器的水。冷却液（水）的温度由节温器的阀门调节。
本发明涉及水冷发动机直接驱动液压泵的场合，实现节能降耗的目的。
The present invention relates to water cooled engine driving hydraulic pump directly and aims at lowering power consumption.
水冷发动机的气缸体是发动机的基本构件。其他部件都支承或安装在他它上面。
The cylinder block of liquid-cooled engines forms the basic framework of the engine. Other parts are attached to the cylinder block or are assembled in it.
在1976年开始，与水冷式前置发动机和变速的924在奥迪的德国内卡苏姆工厂生产。
Starting in 1976, the 924 with a water-cooled front engine and transaxle design is manufactured in the Audi plant in Neckarsulm, Germany.
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