| 摘要 |
A hydraulic cylinder having a rod safety device is provided, which can prevent a free falling of an arm and a bucket by fastening members when a welding part is broken to protect a cab and an operator. The hydraulic cylinder having a rod safety device which includes a cylinder rod sliding within a set stroke range in a tube and composed of a rod head and a rod body joint-connected to the rod head; a cover connected by weld joint to one end part of the tube; an end cover connected by weld joint to the other end part of the tube; a piston fastened to one end part of the cylinder rod to reciprocate along an inner periphery of the tube; and a connection means composed of a screw engagement part formed in center parts of mutual contact surfaces of the rod head and the rod body in a shaft direction to joint-connect the rod head and the rod body by screw-engaging the rod head and the rod body, and a weld joint part joint-connecting the rod head and the rod body by welding outer peripheries of the contact surfaces of the rod head and the rod body.
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