Oil and gas spring cylinder and engineering vehicles

Abstract

The invention provides a hydro-pneumatic spring cylinder which comprises an outer cylinder barrel, a middle cylinder barrel, an inner cylinder barrel, a piston and a piston rod. The piston is fixedly mounted at one end of the piston rod. The other end of the piston rod is fixedly connected with the outer cylinder barrel. The piston is located in the inner cylinder barrel which can move along the axis of the piston rod. The middle cylinder barrel is sleeved outside the inner cylinder. One end of the inner cylinder is connected with the middle cylinder barrel through a joint bearing or a double row thrust bearing or a spherical hinge. The middle cylinder barrel which can move and rotate along the axis of the outer cylinder barrel is inserted into the outer cylinder barrel. The invention further provides an engineering vehicle with the hydro-pneumatic spring cylinder. The hydro-pneumatic spring cylinder can bear radial loads and deliver various loads to a frame without affecting performance and service life of the spring cylinder. The radial loads borne by the hydro-pneumatic spring cylinder do not generate overlarge turning resistance so that airtightness and service life of the hydro-pneumatic spring cylinder are guaranteed. In addition, the hydro-pneumatic spring cylinder has fine oil flow area and strength, and hanging frame properties and turning properties are not affected by hydraulic pipelines.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to an oil-pneumatic spring cylinder and an engineering vehicle including the oil-pneumatic spring cylinder. Background technique [0002] The structure of the oil-pneumatic spring cylinder used in the oil-pneumatic suspension system is mostly equivalent to the structure of the barrel shock absorber, which can only bear the load along the axial direction of the spring cylinder for buffering and shock absorption; it cannot bear radial load, so the spring When the cylinder is in use, it must be equipped with some guiding and force transmission devices to bear and overcome various loads. [0003] Patent US5031732 discloses an automobile shock absorber, which includes a guide cylinder, a support assembly, a guide ring, a piston, a piston rod, a hydraulic pipeline and an accumulator. The technical problems of this structural form are: [0004] 1) The middle cylinder and the inner cyl...

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Problems solved by technology

[0009] 3) The oil circuit in the rodless cavity is led out from the bottom of the outrigger through the piston rod, so it is difficult to arrange the pipe, and the length of the pipe will change with the stroke of the oil cylinder;

[0012] 1) The structure includes two oil circuits, and the structure is very complicated. To achieve the design purpose, the precision requirements of each component are very high, and it is difficult to manufacture;

[0013] 2) There are many oil passages and seals in the whole structure, and there is a great risk of oil leakage

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