JPS6333007U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a hydraulic actuator that is an embodiment of this invention, Fig. 2 is a sectional view showing the upper part of the cylinder when the piston is started, and Fig. 3 shows the relationship between pressure in each part of the cylinder chamber and time. graph, 4th
The figure is a sectional view showing the lower part of the cylinder when the piston is stopped, and FIG. 5 is a schematic view showing a conventional actuator. 1: cylinder chamber, 4: piston, 7: pressure oil supply groove, 15: switching valve, 17: check valve, 18: bypass pipe.

Claims (1)

[Scope of Claim for Utility Model Registration] In a fluid pressure actuator in which the piston is movable up and down in the cylinder chamber, the piston is positioned at a run-up distance from the top surface of the cylinder chamber and facing the side surface of the piston at the top dead center of the piston. , a ring-shaped pressure fluid supply groove is formed on the inner surface of the cylinder chamber, the pressure fluid supply groove and the lower part of the cylinder chamber are communicated with a bypass pipe having a check valve, and the pressure fluid supply groove is provided with a pressure fluid supply port. A fluid pressure actuator characterized in that a pressure fluid discharge port is communicated with a lower part of the cylinder chamber.