automobile Engineering oil cylinder Share with you Hydraulic system Analysis of pressure formation

The hydraulic system shown in the formation diagram of hydraulic system pressure is taken as an example for explanation.

The hydraulic oil pump continuously Hydraulic cylinder When the hydraulic oil is full, the piston can not move to the right due to the obstruction of the external load F. If the hydraulic oil pump continues to supply oil to the hydraulic cylinder by force, the squeezing effect and pressure will continue to increase.

When the pressure acting on the effective area A of the piston rises enough to overcome the external load, the piston moves to the right, and the system pressure is: P=F/A

If F does not change any more, the volume of the left chamber of the hydraulic cylinder increases continuously due to the movement of the piston, which just conforms to Hydraulic station At this time, the oil will not be squeezed more, so the pressure will not continue to rise, and the corresponding p value will always be maintained.

If the pressure gauge is used to measure b and c respectively, then the two measured conditions will be that the pressure in the state shown in Figure b is equal to zero. This is because the external load is zero at this time (regardless of the pipe resistance), and the flow of hydraulic oil is not blocked except for the pipe resistance, so the pressure cannot be established.

When the piston moves to the end of the cylinder block, because the hydraulic oil pump continuously supplies oil, but the volume of the left chamber of the hydraulic cylinder cannot be increased, the pressure of the hydraulic system rises sharply. If there are no protective measures in the hydraulic system, the weak links of the hydraulic system will be easily damaged.

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From the above analysis, it can be seen that the pressure in the hydraulic system is due to the hydraulic oil being squeezed due to the obstruction of various forms of external loads. The size of the pressure depends on the size of external loads.