Abstract: The rebound spring structure includes: a rebound spring; a lower rebound collar configured to hold an end on one side of the rebound spring; and an upper rebound collar configured to hold an end on the other side of the rebound spring, the rebound spring structure being positioned around a rod configured to move relative to a cylinder. The lower rebound collar is held by a piston rod. The upper rebound collar is movably fitted to the piston rod. The upper rebound collar includes a recess on an upper disk part configured to restrict movement of the rebound spring to the other side, the recess being configured to facilitate movement of the upper rebound collar in a circumferential direction of the piston rod.

Abstract: The rebound spring structure includes: a rebound spring; a lower rebound collar configured to hold an end on one side of the rebound spring; and an upper rebound collar configured to hold an end on the other side of the rebound spring, the rebound spring structure being positioned around a rod configured to move relative to a cylinder. The lower rebound collar is held by a piston rod. The upper rebound collar is movably fitted to the piston rod. The upper rebound collar includes a recess on an upper disk part configured to restrict movement of the rebound spring to the other side, the recess being configured to facilitate movement of the upper rebound collar in a circumferential direction of the piston rod.

Abstract: A piston section includes a valve seat that forms a first compression-side oil path through which oil flows in accordance with relative movement of a piston rod against a first cylinder, a first compression-side valve section that performs opening-closing of the first compression-side oil path of the valve seat, an inner annular section annularly formed as projecting in the axial direction of the valve seat from the valve seat toward the first compression-side valve, and an extending section that extends in the radial direction of the valve seat from an outer side of the inner annular section to a position at the inner side from a second oil path opening of the first compression-side oil path and projects in the axial direction from the valve seat toward the first compression-side valve section.

Abstract: One embodiment provides a pressure buffer device including: a cylinder that stores fluid; a flow path forming portion that forms a flow path; and an opening-closing portion that opens and closes the flow path of the flow path forming portion. The fluid flows through the flow path forming portion in accordance with relative movement of a rod with respect to the cylinder in an axial direction of the cylinder. The flow path forming portion includes an annular first protruded portion and an annular second protruded portion protruded in the axial direction in opposite sides respectively. The second protruded portion has an axial end located at a radially outer side of the first protruded portion, and a tilt portion formed at least at a part of a radially-inner part of the second protruded portion.

Abstract: One embodiment provides a pressure buffer device including: a cylinder that stores fluid; a flow path forming portion that forms a flow path; and an opening-closing portion that opens and closes the flow path of the flow path forming portion. The fluid flows through the flow path forming portion in accordance with relative movement of a rod with respect to the cylinder in an axial direction of the cylinder. The flow path forming portion includes an annular first protruded portion and an annular second protruded portion protruded in the axial direction in opposite sides respectively. The second protruded portion has an axial end located at a radially outer side of the first protruded portion, and a tilt portion formed at least at a part of a radially-inner part of the second protruded portion.

Abstract: A piston section includes a valve seat that forms a first compression-side oil path through which oil flows in accordance with relative movement of a piston rod against a first cylinder, a first compression-side valve section that performs opening-closing of the first compression-side oil path of the valve seat, an inner annular section annularly formed as projecting in the axial direction of the valve seat from the valve seat toward the first compression-side valve, and an extending section that extends in the radial direction of the valve seat from an outer side of the inner annular section to a position at the inner side from a second oil path opening of the first compression-side oil path and projects in the axial direction from the valve seat toward the first compression-side valve section.