| 摘要 |
<p>PURPOSE: To obtain preloading force sufficiently and surely by utilizing fluid pressure without help of any pump, and feeding a required quantity of pressure fluid to the control chamber of a pressure fluid moving device in particular simple manner. CONSTITUTION: The annular recessed hole 45 of a slide valve 36 communicates between the two parts of a main duct 29, and pressure oil can flow backward from a control chamber 26 to an inflow port 30 as shown in arrow mark F2. Consequently oil returns to an oil feed cylinder. Simultaneously with this, the pressure of the control chamber 26 is applied to the slide valve 36 through a branch duct 43 on the left end of the slide valve, i.e., on the far end from an elastic means 37. When the axial force due to the elastic means 37 is balanced with the oil pressure, the flat part of the slide valve 36 is on the intermediate position where the main duct 39 is intercepted to declutch. At this time, some residual pressure exists in the control chamber 26. This residual pressure gives required preloading force. This residual pressure can be regulated by properly graduating the elastic means 37.</p> |
