| 摘要 |
<p>PURPOSE:To improve the extent of control accuracy by conducting the measured differential pressure into a high pressure chamber and a low pressure chamber of a cylinder partitioned off by a piston, and having a beam or piston rod stuck with a strain gauge elastically deformed by movements of the piston. CONSTITUTION:In a differential pressure sensor 10 available for a hydraulic circuit or the like of an automatic gear for vehicle use, the inside of a bore 12 of a cylinder body 11 is partitioned into a high pressure chamber 14 and a low pressure chamber 15 by means of a piston 13, and a ball end 24 at the tip of an elastic beam 16, whose base end is locked, is engaged with a ring groove 23 of the piston 13, then each strain gauge 17 is stuck to both the sides. When high pressure side hydraulic pressure of the hydraulic circuit is guided into the high pressure chamber 14 and low pressure side hydraulic pressure into the low pressure chamber 15, respectively, the piston 13 is moved by the differential pressure, having the elastic beam 16 elastically deformed, and a signal conformed to the differential pressure is taken out of the strain gauge 17 via a lead 25, then it is fed back to a hydraulic controller. Thus improvement in control accuracy is well promotable.</p> |
