| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic hammering device capable of improving a hammering efficiency and reducing a machining cost. SOLUTION: In the hydraulic hammering device, a switching valve having a solid structure is slidably fitted in a valve chest non-coaxial to a piston. The switching valve is equipped with a valve larger diameter part, a valve smaller diameter part respectively provided at the front and rear ends of the valve larger diameter part, a valve retreat regulation part which is disposed between the valve larger diameter part and the valve smaller diameter part of the rear end and regulates the movement to rear part of the switching valve, a valve high pressure supply groove provided at the middle of the valve larger diameter part so as to communicate the rear chamber to a high-pressure circuit, and a valve scavenge groove provided between the valve larger diameter part and the valve rear end regulation part so as to communicate the rear chamber to a low pressure circuit. A valve control chamber formed at the valve smaller diameter part side of the front end of the valve chest and a valve regulation chamber formed at the valve smaller diameter part side of the rear end are partitioned in the valve chest. The valve regulation chamber is always connected to a high-pressure circuit, and the valve control chamber can be communicated by alternately switching between the high-pressure circuit and the low-pressure circuit by forward and backward movement of the piston. COPYRIGHT: (C)2008,JPO&INPIT
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