| 摘要 |
PURPOSE:To easily introduce a hydraulic driving device into a diving boat, by applying a depth pressure of the diving boat to a low-pressure line in a hydraulic circuit of the hydraulic driving device. CONSTITUTION:A hydraulic pump 10 and a hydraulic motor 7 are connected through an electromagnetic valve 14 by a high-pressure line 15 and a low- pressure line 16 in a hydraulic circuit 13. In a depth pressure compensating mechanism 18, a piston 20 is mounted in a cylinder 19 so as to be slidable by means of a spring 21. An inside chamber 22 defined by the piston 20 in the cylinder 19 is connected to the low-pressure line 16. An outside chamber 23 defined by the piston 20 is opened through a shell 1a of a hull to the outside. Thus, the sea water is introduced into the chamber 23, and accordingly, a depth pressure of the diving boat is applied through the piston 20 to the low-pressure line 16. As the depth pressure, that is, the pressure in the low-pressure line 16 is increased, generation of aeration may be prevented.
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