A buffer hydraulic cylinder is a buffer device for a hydraulic cylinder placed in a hydraulic cylinder. The buffer device for a hydraulic cylinder. Due to the provision of the buffer device, even when an external force is applied to the hydraulic cylinder, a situation where the pressure is higher than the design strength of the hydraulic cylinder does not occur.
In a hydraulic cylinder buffer device provided in a hydraulic cylinder, the hydraulic cylinder includes a tube constituting a collection chamber of hydraulic oil, a rod for linear movement, a piston fixed to the rod and separating the collection chamber of the tube, and an end protrusion The hydraulic cylinder buffer device includes a buffer sleeve mounted on the rod close to the piston. If the piston approaches the flange on the rod side during linear movement of the rod, a predetermined buffer pressure is generated in the rod side chamber. The upper elastic body prevents the piston from colliding with the rod side end flange and absorbs the impact through its elasticity.