Abstract: In a hydraulic cylinder having a shock absorbing function, and capable of stopping as desired by an accumulator disposed within a cylinder rod. The accumulator includes an accumulator piston that divides the cylinder rod interior into first and second cylinder rod chambers, gas hermetically charged into the second cylinder rod chamber, and an accumulation port that is communicated with the first cylinder rod chamber and flows the operating oil from outside into the first cylinder rod chamber.

Abstract: A hydraulic circuit for a hydraulic cylinder capable of executing and adjusting a shock absorbing function at the time of stopping the operation of a cylinder piston rod and releasing the function, comprises a damping control valve (v1) having a first switching position (v11) which blocks the connection of the accumulation port (22) with outside and performs supply and discharge or discharge and supply of the operating oil with respect to the first cylinder chamber (3) and the second cylinder chamber (4), a second switching position (v12) connecting at least the accumulation port (22) and the second cylinder chamber (4), and a third switching position (v13) connecting at least the accumulation port (22) and the first cylinder chamber (3).

Abstract: A hydraulic circuit for a hydraulic cylinder capable of executing and adjusting a shock absorbing function at the time of stopping the operation of a cylinder piston rod and releasing the function, comprises a damping control valve (v1) having a first switching position (v11) which blocks the connection of the accumulation port (22) with outside and performs supply and discharge or discharge and supply of the operating oil with respect to the first cylinder chamber (3) and the second cylinder chamber (4), a second switching position (v12) connecting at least the accumulation port (22) and the second cylinder chamber (4), and a third switching position (v13) connecting at least the accumulation port (22) and the first cylinder chamber (3).

Abstract: In a hydraulic cylinder having a shock absorbing function, and capable of stopping as desired by an accumulator disposed within a cylinder rod, the accumulator comprises an accumulator piston that divides the cylinder rod interior into first and second cylinder rod chambers, gas hermetically charged into the second cylinder rod chamber, and an accumulation port that is communicated with the first cylinder rod chamber and flows the operating oil from outside into the first cylinder rod chamber.