| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a hydraulic device reducing friction and smoothing slide between a plunger and a plunger hole provided in a cylinder block, and preventing eccentricity of the plunger in the plunger hole. <P>SOLUTION: The hydraulic device is provided with grooves 8d, 10d, 31a, 31b, 41a, 41b or the like in parallel with an opening surface of the cylinder block 7 on a surface on which the plungers 8, 10 and the plunger holes 31, 42 are butted. The position where the grooves or the like are provided is either of a position which gets closest to an opening surface of the cylinder block 7 at an extension side dead center of the plungers in butting parts of side surfaces of the plungers 8, 10 and the plunger holes 31, 41, or a position which gets farthest from the opening surface of the cylinder block 7 at an extension side dead center of the plungers 8, 10 in parts near the opening surface of the cylinder block 7 on an inner surface of the plunger holes 31, 41 and the butting parts of the plungers 8, 10 and inner surfaces of the plunger holes 31, 41. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
