| 摘要 |
A lubricant supply device for a hydraulic breaker is provided to supply lubricant into a lubricant supply unit of a chisel periodically by hydraulic pressure in operating the hydraulic breaker, and to prevent malfunction by simply moving a pumping piston back and forth in a body block. A cavity(110) is formed in a body block(100), and a pumping piston is moved back and forth in the cavity. A pumping rod(210) is fitted to a lubricant pumping passage(120), and a lubricant supply passage(130) is formed in the body block and communicated with the lubricant pumping passage. A hydraulic supply passage(140) is connected to the cavity, and lubricant is discharged from the lubricant pumping passage by moving the pumping piston forward with hydraulic pressure from the hydraulic supply passage. A hydraulic discharge passage(150) is formed in the body block and communicated with the cavity. A spring(300) is mounted between an assembling part(230) of the pumping piston and an installation part(121) of the lubricant pumping passage, and the pumping piston is moved backward with restoring force of the spring in offsetting hydraulic pressure applied to the pumping piston by a switching spool(250). A stopper unit is formed between the cavity and the hydraulic supply passage.
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