Single-way damping plunger cylinder and forklift comprising the same

A single-way damping plunger cylinder, comprising:

• a cylinder body defining a top end and a bottom end;
• a piston rod defining a first end extending out of the cylinder body and a second end located within the cylinder body;
• a piston disposed in the cylinder body and fixed to the second end of the piston rod, the piston dividing the cylinder body into a first cylinder chamber and a second cylinder chamber, the piston rod located at least partially in the first cylinder chamber;
• a first oil passage and a second oil passage defined in the piston rod, a first end of the first oil passage being communicated with the first cylinder chamber via the second oil passage and a second end of the first oil passage being communicated with the second cylinder chamber;
• a valve movably disposed in the second oil passage, so as to open or close a direct communication of the first and second coil passages;
• a damping oil passage defined in the valve and configured to communicate the first oil passage with the second oil passage when the valve closes the direct communication of the first and second oil passages, an inner diameter of the damping oil passage being less than that of the first oil passage;
• and
• a sleeve disposed on an inner surface of the cylinder body and adjacent to the top end of the cylinder body, and the sleeve being configured to drive the valve to close the direct communication of the first and second oil passages.