What should I do if the hydraulic rod of the back cover of the car trunk can't hold up?

The hydraulic rod is made of disposable goods, and it can only be replaced with a new one after being damaged. It's best not to open it, because it contains high-pressure liquid, and it's dangerous to open it. Ordinary hydraulic oil will definitely not work, because the oil used for the hydraulic rod is high-pressure oil, and the hydraulic rod is well sealed, so it will not meet the requirements if it is dismantled.

An elastic element with gas and liquid as working medium is composed of a pressure tube, a piston, a piston rod and several connectors, and its interior is filled with high-pressure nitrogen. Because the piston has a through hole, the gas pressure at both ends of the piston is equal.

But the cross-sectional areas on both sides of the piston are different, one end is connected with the piston rod and the other end is not. Under the action of gas pressure, the pressure to the side with small cross-sectional area, that is, the elastic force of the support rod, can be set by setting different nitrogen pressures or piston rods with different diameters.

Extended data:

Hydraulic rod mainly depends on oil pressure, clearance between tappet and seat hole, clearance between valve stem and tappet, and check ball valve in tappet. When the hydraulic tappet starts to work, because there is no oil pressure in the cavity, the tappet plunger is at the bottom, the gap between the tappet and the valve is large, and the valve produces short-term abnormal sound. With the operation of the engine, under the action of oil pressure, the plunger cavity in the tappet is filled with oil, and the plunger moves downward, which increases the effective working length of the tappet and reduces the valve clearance.

Because the force generated by the plunger in the tappet is too small to compress the valve spring, the tappet will not move when the clearance between the tappet and the valve is too small. At the same time, due to the function of the check ball valve in the tappet, the oil pressure in the plunger cavity of the tappet can not be discharged quickly, so that the plunger stays in its original position and maintains its original length to form rigidity, thus pushing the valve to open. When the engine is running, the valve clearance keeps a certain clearance.

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