| 摘要 |
PROBLEM TO BE SOLVED: To provide a piston leakage oil prevention device of a breaker.SOLUTION: A piston leakage oil prevention device of a breaker is configured to include: first to fourth packing insertion grooves 150a to 150d formed sequentially on an inner peripheral surface of a cylinder 110 in contact with a piston; and working oil return grooves 190 formed in lower sides of the first packing insertion groove and the second packing insertion groove, respectively and provided continuously to respectively communicate with a low pressure chamber so as to return working oil. |
