| 摘要 |
In a tilt cylinder device for an outboard motor, a piston having its piston rod is extends to an outboard motor side and a free piston are freely movably inserted into a cylinder. Within the cylinder are oil chambers S1, S2, and S3. An accumulator chamber S4 is provided so as to surround the cylinder. A third communication passage is formed from the piston to the free piston. In the third communication passage is provided a second relief valve that opens when the oil chamber S3 has exceeded a set pressure. To this second relief valve is additionally provided an opening/closing mechanism for opening or closing the valve from the outside.
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