| 摘要 |
<p>PURPOSE:To maintain the temperature of the lubricating oil at a constant temperature, and to prevent the rotation at the time of neutral, and to hinder the increase of the power loss by providing a bypass circuit in parallel with a lubricating oil cooler, and arranging a temperature control valve for switching the bypass circuit and a circuit of the lubricating oil cooler. CONSTITUTION:A temperature control valve V is arranged in a lubricating oil circuit, and a bypass circuit 9 is provided so as to prevent the pass of the lubricating oil through a lubricating oil cooler 15 till the lubricating oil temperature achieves the set temperature. This bypass circuit 9 is communicated with an operating oil passage 8, which is provided between an ahead and astern switching valve G and a loose fitting valve K, through a check valve 13. At the time when the ahead and astern switching valve G is positioned neutral, the lubricating oil pressure of the bypass circuit 9 pushes the loose fitting valve K so as to raise a load of an operating oil pressure pump P, and a rise of the lubricating oil temperature is accelerated. At this stage, a restriction part 3 for operating the loose fitting valve K is provided for fixation. The check valve 13 for preventing the counterflow from the operating oil side is interposed in an oil passage 30 for communicating the bypass circuit 9 with a communicating oil passage 8.</p> |
