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采用液压调速器来控制柴油机射油泵的速度时有着一个缺点:由于温度变更,使工作油的粘度变化,因而会使控制有所改变。英国 Simms Motor Units Ltd.在发展液压调速器的进展中已设计出了一种装置,来克服温度变更对调节速度的影响。这种装置的工作原理如下(见附图):轴1的一端被加工成与其轴心线成某一个较小的角度,它将一个油孔部分地遮住,因此轴在围绕其轴心线旋转时就改变了这个油孔的开启面积大小。在与轴1处于同一根轴心线上的另一根轴2外铸上固装着控制杆3。这两根轴用一个对温度感受灵敏的圆环形双金属片4相联,双金属片则浸没在自液压系统来的工作油中。当控制杆3被安置在一个固定的位置时,工作油温度的改变就会使轴1产生转动并使油孔的面积变更,因而保持一个不变的控制油压。
There is one downside of using a hydraulic governor to control the speed of a diesel pump: the viscosity of the working oil changes due to temperature changes, which can change the control. In the development of hydraulic governors, Simms Motor Units Ltd. has designed a device to overcome the effect of temperature changes on speed regulation. The principle of operation of this device is as follows (see attached drawings): One end of the shaft 1 is machined to be at a small angle to its axis which partially obscures an oil hole so that the shaft rotates about its axis Change the size of the opening area of the hole when rotating. In the same axis with the shaft 1 on the other shaft 2 cast on the control rod 3 fixed. The two shafts are connected by a ring-shaped bimetal 4 sensitive to temperature and the bimetal is immersed in the hydraulic oil from the hydraulic system. When the control rod 3 is set in a fixed position, a change in the working oil temperature causes the shaft 1 to rotate and the area of the oil hole to be changed, thereby maintaining a constant control oil pressure.