1, txhua yam peb cov uas quav symmetrical dabtsi yog khoov siv lub tshuab. Txhua yam peb cov uas quav symmetrical dabtsi yog khoov tshuab qauv ua ntawm peb chais, yob ob rolls rau Central symmetry ntsug ntsug zog, yeej sib ntsia hlau cab kis, ob sab rau cov menyuam rau cov lus tsa suab teb los ntawm cov zis iav reducer thiab cov txo cov menyuam iav, dov mus muab torque ntsia hlau. Txhua yam peb cov uas quav symmetrical dabtsi yog khoov tshuab tos bent phaj kawg ntawm lwm pab kiag li lawm.
2, hydraulic peb cov uas quav symmetrical dabtsi yog khoov siv lub tshuab. Hydraulic yam peb dov tej yam ntim Board siv lub tshuab (yob peb ntim Board tshuab) qauv yam rau peb dov kuj ntaus, Shang ntog hauv ob Xia yob Central kuj chaw rau txoj lifting zog, mus txog hydraulic lub tog raj kheej ntawm roj hydraulic tug Yu piston thiab tau txais, rau tsav hydraulic; ob Xia yob rau rotating no, los ntawm kev siv lub tshuab deceleration ntawm cov zis iav thiab yob Xia tus hniav meshing, ntim rau cov lag luam phaj qhia torque. Hydraulic peb cov uas quav symmetrical dabtsi yog khoov siv lub tshuab yog compact qauv, teem sijhawm ua haujlwm thiab nkawm.