A shock-absorbing oil cylinder used for overturning cabs of medium-heavy vehicles

Abstract

The invention relates to a damping oil cylinder for overturning of driving cabs of medium and heavy trucks. The damping oil cylinder comprises a base (1) which is connected with a cylinder barrel (2), and a piston (10) is movably connected in the cylinder barrel. The damping oil cylinder is characterized in that a group of main oil passages is arranged in the base; a valve spool (16) is arranged in a first main oil passage (19) in a sliding fit manner and is in one-way communication with the same; a push rod (15) is connected in a second main oil passage (20) in a sliding fit manner; a second one-way plug ball (17a) and a third one-way plug ball (17b) are connected with a third main oil passage (21) in a matched manner; a joint (12) is connected in each of rest main oil passages in a matched manner, and the cylinder barrel (2) is communicated with the base (1) through a short oil tube (4) and a long oil tube (5). The damping oil cylinder has the advantages that the oil cylinder has a floating function, stable overturning of rising and retracting of the driving cabs is realized, the oil cylinder is in soft contact with a truck chassis and one driving cab, and noise is eliminated.

Description

technical field [0001] The invention relates to an overturning device for a cab of a medium-heavy vehicle, in particular to a shock-absorbing oil cylinder for overturning the cab of a medium-heavy vehicle. Background technique [0002] When medium and heavy-duty vehicles need to maintain or repair the engine, the hydraulic system is usually used to lift the cab to facilitate maintenance or repair operations. At present, when the cabs of medium and heavy-duty vehicles are being lifted and lowered, it is difficult to maintain a smooth flip in the process of rising and recovering the cabs, resulting in sharp vibrations and loud noises. Falling body movement, when the oil cylinder is pulled to the longest by the cab due to the drop, the cab and the oil cylinder simultaneously bear the huge impact force caused by the falling movement of the cab, which will cause the cab to deform and tear after long-term use , the phenomenon that the oil cylinder is pulled off or broken, after e...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the disadvantages of medium and heavy-duty vehicles, such as difficulty in maintaining stable overturning and large impact during the lifting and recovery process of the cab, and propose a shock-absorbing oil cylinder for medium and heavy-duty vehicle cab overturning.

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