Singe-acting hydraulic cylinder

Abstract

The invention discloses a single-acting hydraulic cylinder which comprises a cylinder body (1), a piston rod piece, a one-way valve (4), a plunger (5) and a spring piece (12). A plunger movement cavity is formed in the piston rod piece, the plunger (5) is movably arranged in the plunger movement cavity in a reciprocating mode and enables a leaked oil collecting cavity (G) located between the plunger (5) and the piston rod piece to be formed in the middle area of the plunger movement cavity in a partitioned mode, an oil guiding channel (E) is formed in the piston rod piece, one end of the oil guiding channel (E) is communicated with a rod cavity (B), and the other end of the oil guiding channel (E) is selectively communicated with the leaked oil collecting cavity through reciprocating movement of the plunger (5) or closed through the plunger (5) to be separated from the leaked oil collecting cavity (G). In addition, a leaked oil channel connected with the leaked oil collecting cavity (G) and a rodless cavity (A) is formed inside the plunger (5), the one-way valve (4) is installed in the leaked oil channel, and a reverse end opening of the one-way valve (4) is hydraulically connected to the rodless cavity (A). The single-acting hydraulic cylinder is large in pushing force and capable of collecting internally-leaked hydraulic oil.

Description

technical field [0001] The invention relates to a hydraulic cylinder, especially a single-acting hydraulic cylinder. Background technique [0002] Hydraulic cylinders can be divided into single-acting hydraulic cylinders and double-acting hydraulic cylinders according to the form of action. Among them, the internal structure of the single-acting hydraulic cylinder is relatively simple. There is only one oil inlet, which also serves as the oil return port. When the oil inlet enters the oil, the piston rod is pushed out. The hydraulic cylinder can only provide one-way force, and needs to rely on external force (such as being pushed by the weight of the load) when retracting. Single-acting hydraulic cylinders are typically used in transport vehicle jacking cylinders, crawler mast jacking cylinders, and the like. [0003] figure 1 , figure 2 There are two common structural forms of single-acting hydraulic cylinders. Such as figure 1 As shown, the hydraulic cylinder is com...

AI Technical Summary

Problems solved by technology

Since D is greater than d, so figure 1 The hydraulic cylinder of the structural form has a large thrust of the cylinder, but the disadvantage is that the cylinder is prone to leakage due to internal leakage and pollutes the working environment

figure 2 The hydraulic cylinder has a simple structure and no internal leakage, but it can provide small thrust

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