| 摘要 |
In order to maximize percussion force and reduce the number of components and weight by installing a valve between a piston and a cylinder, the invention provides a percussion movement apparatus which comprises a valve installed between the piston and the cylinder, the valve being constructed to open/close a flow path and organically cooperate with the piston by predetermined movements thereof, the valve having substantially cylindrical overall shape whose both end surfaces which is upper and lower end surfaces thereof with different cross sectional areas, and also the valve including a longitudinal piston hole with multistage sills, a plurality of holes extending rectangularly to the piston hole for communicating the piston hole with exterior, and an annular projection with front and rear peripheral surfaces partially formed on a peripheral surface of the valve, the cylinder being mounted the outside of the valve and including a plurality of cylinder holes for reciprocating the piston; and a rear cover mounted on the rear of the valve and the cylinder, the piston, the cylinder and the valve having a plurality of chambers and a valve switching chamber defined by making a difference in diameter along a longitudinal direction for providing predetermined annular chambers between inner and outer peripheral surfaces thereof into which the fluid can be introduced, and the cylinder including a cylinder block formed with a plurality of fluid passages for inflow/discharge of a working oil.
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