Damper of hydraulic pilot valve
AssigneeKomatsu Ltd.
InventorsMasayoshi Mototani, Seita Hayashi, Jun Maruyama
Life of this patent
Estimating the term…
Abstract
A damper for a hydraulic pilot valve having a valve body in which a plurality of pressure reducing valves, a rotational shaft, an operation member attached to the rotational shaft and a handling member rotating the rotational shaft are provided. The pressure reducing valves are operated through the operation member, by rotating the rotational shaft by the handling member, and the damper is disposed in the valve body and is adapted to apply an operational resistance to the operation member due to a viscous resistance of a fluid having high viscosity.
Claims6
A damper for a hydraulic pilot valve,
- wherein said hydraulic pilot valve comprises a valve body in which a plurality of pressure reducing valves, a rotational shaft, an operation member coupled to the rotational shaft, and a handling member for rotating the rotational shaft are provided, said pressure reducing valves being operable by the operation member responsive to the rotational shaft being rotated by the handling member,
- wherein the damper is symmetrically disposed in the valve body and is arranged to apply a symmetrical operational resistance to the operation member in each operational direction due to a viscous resistance of a high viscosity fluid, and
- wherein a piston is rotatably fitted in a case fitted to the valve body so as to form an annular space between the case and the piston, the high viscosity fluid is sealed in the annular space, and the piston and the rotational shaft are coupled together so as to be rotatable together.
A damper for a hydraulic pilot valve,
- wherein said hydraulic pilot valve comprises a valve body in which a plurality of pressure reducing valves, a rotational shaft, an operation member coupled to the rotational shaft, and a handling member for rotating the rotational shaft are provided, said pressure reducing valves being operable by the operation member responsive to the rotational shaft being rotated by the handling member,
- wherein the damper is symmetrically disposed in the valve body and is arranged to apply a symmetrical operational resistance to the operation member in each operational direction due to a viscous resistance of a high viscosity fluid, and
- wherein a piston is rotatably fitted in a case fitted to the valve body so as to form an annular space between the case and the piston, the high viscosity fluid is sealed in the annular space, and the case and the operation member are coupled together so as to be rotatable together.
A damper for a hydraulic pilot valve,
- wherein said hydraulic pilot valve comprises a valve body in which a plurality of pressure reducing valves, a rotational shaft, an operation member coupled to the rotational shaft, and a handling member for rotating the rotational shaft are provided, said pressure reducing valves being operable by the operation member responsive to the rotational shaft being rotated by the handling member,
- wherein the damper is symmetrically disposed in the valve body and is arranged to apply a symmetrical operational resistance to the operation member in each operational direction due to a viscous resistance of a high viscosity fluid, and
- wherein a pair of pistons are coupled together and fixed in the valve body, cylinders are fitted to the pistons to be slidable to form cylinder chambers between the pistons, the high viscosity fluid is sealed in the cylinder chambers, and the cylinders and rotational shaft are coupled with each other so as to slide the cylinders in relation to a rotation of the rotational shaft, said damper being symmetrical in structure with respect to both an insertion and pull-out direction of the handling member.
Dependencies are inferred from the claim text.