Air spring

Abstract

The invention discloses an air spring. The air spring comprises a cylinder with filler sealed inside, a piston and a piston rod. The piston is arranged in the cylinder and can slide in the axial direction of the cylinder, one end of the piston rod is connected with the piston, and the other end of the piston rod protrudes towards the cylinder. The piston divides the interior of the cylinder into an upper cavity and a lower cavity. A first damping hole allowing the filler to pass and enter the upper cavity or the lower cavity is formed in the piston. The air spring further comprises a valve block assembly which allows the piston rod to penetrate and is arranged in the lower cavity. The valve block assembly comprises a first valve block abutting against the end face of the piston, and a second valve block capable of abutting against the first valve block. By means of the arrangement of the valve block assembly and a pressure regulating sheet, a three-stage damping function on the filler is achieved; and in cooperation with an arc-shaped elastic pressing sheet arranged on the second valve block and sliding connection arrangement between the pressure regulating sheet and the piston rod, pressure is gradually increased when the piston rod contracts into the cylinder, then buffer force is gradually increased, and the buffer effect on an object is gradually enhanced.

Description

technical field [0001] The invention relates to an elastic buffer device, in particular to an air spring. Background technique [0002] Gas spring is an industrial accessory that can support, buffer, brake, height adjust and angle adjust. It is used in automobiles, medical fitness equipment and building doors and windows. Existing gas springs such as figure 1 As shown, it includes a cylinder body 2, a piston rod 1 partly pierced in the cylinder body 2, the end of the piston rod 1 is pressed with a piston 3 by riveting or a nut, and the piston 3 can move axially in the cylinder body 2, And the interior of the cylinder 2 is divided into an upper chamber 21 and a lower chamber 22. Fillers (inert gas or oil-gas mixture) are arranged in the upper and lower chambers 21 and 22, and the upper and lower chambers 21 and 22 are opened on the piston 3. The damping holes 31 in the lower chamber 22 communicate with each other, the cross-sectional area contacted by the filler in the lowe...

AI Technical Summary

Problems solved by technology

But in some fields, such as the field of medical machinery, it is necessary to ensure that there is no impact on the ground when the equipment is put down. This requires the piston rod of the gas spring to gradually increase the cushioning effect on the equipment when it extends into the cylinder. Some gas springs have a certain force on the equipment when the piston rod extends into the cylinder, which cannot achieve a better cushioning effect.

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