Large-connecting-rod two-grade buffering shock absorber

Abstract

The invention discloses a large-connecting-rod two-grade buffering shock absorber. The large-connecting-rod two-grade buffering shock absorber comprises an inner working cylinder, a piston assembly arranged in the inner working cylinder, shock absorption oil, inert gas, a piston rod on a piston and a guiding device arranged at the upper part of the inner working cylinder, wherein a sealing dustproof cover and a sealing ring are arranged at the upper end of the guiding device; a piston buffering block is further arranged on the piston rod and is of a cylindrical structure; a gap is formed between the piston buffering block and the inner wall of the inner working cylinder; steel balls for guiding and positioning are embedded at the periphery of the outer side wall of the piston; an air guiding channel is arranged between the inner part and the outer part of the cylindrical structure of the piston buffering block; a working cylinder body is composed of a first cylinder body and a second cylinder body which are different in diameter; a transition section is arranged between the first cylinder body and the second cylinder body; oil grooves which are arrayed spirally are formed in the surface of a pipe body of the piston rod. Compared with the prior art, the movement of the piston is more flexible and the shock absorption performance is better; the large-connecting-rod two-grade buffering shock absorber is dustproof and has longer service life.

Description

technical field [0001] The invention relates to a vehicle shock absorber which improves the stability of the vehicle during running, in particular to a two-stage buffer shock absorber with a large connecting rod. Background technique [0002] At present, the shock absorbers used in automobiles are basically hydraulic shock absorbers. The principle is that when the frame and the axle do reciprocating relative motion and the piston moves back and forth in the cylinder barrel of the shock absorber, the shock absorber inside the shock absorber housing The oil will repeatedly flow from the inner cavity through some narrow pores into another inner cavity. At this time, the friction between the liquid and the inner wall and the internal friction of the liquid molecules will form a damping force on the vibration. Shock absorbers can be divided into double-cylinder type and single-cylinder type according to their structure. The double-cylinder type means that the shock absorber has ...

AI Technical Summary

Problems solved by technology

[0003] When the vehicle bumps frequently and has a large amplitude, the circulation of shock absorbing oil in the cylinder is lagging behind, and a vacuum area is likely to appear in the cylinder, and the piston can no longer work to the original lower position, making the compression damping increase to an unacceptable value

Moreover, it is prone to abnormal noise from noise and vibration, which seriously affects the shock absorption effect

Chinese patent, the patent number is 200620141855.7, the patented technology named "Cylinder Hydraulic Shock Absorber with Floating Piston", a floating piston device is installed at the bottom of the cylinder, which basically solves the above problems, but this technology still has shortcomings, If the volume filled with high-pressure gas is too small, it cannot be used for shock absorbers with large connecting rods

However, there are still shortcomings in practical application, mainly because there will be a gap between the piston and the cylinder liner due to direct wear, and the oil will leak from the gap during work, making the working effect worse and reducing the service life.

In addition, the existing shock absorber generally has a shortcoming. Since the working cylinder is cylindrical, the connecting rod piston can only perform one level of buffering when buffering the hydraulic pressure, so the buffering force is insufficient, and it is easy to cause severe vibration of the vehicle body.

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