| 摘要 |
<p>1,244,864. Hydraulic motor control circuits. MITSUBISHI JUKOGYO K. K. Nov. 7, 1968 [Nov.24, 1967], No.52866/68. Heading F1P. A plurality of double-acting hydraulic actuators 40, 47, 54, 58 Fig. 1 are supplied either singly or any one of actuators 47, 54, 58 together with actuator 40 by a single pump 25 which delivers through a supply line 27 and through a flow dividing valve 29 or through a by-pass thereof to three-position spool valves 29 1 , 29 2 , 29 3 , 29 4 which in their neutral positions shown connect the supply line 27 through by-pass passages 44, 44 2 , 44 ¢ to a return line 61, the arrangement being that on moving spool valve 29, say to the right as shown in Fig. 2 the outlet of the by-pass of the flow dividing valve 29 is blocked by a land 33 2 of a spool valve 29, whereon a first portion of the supply fluid is directed through a first axial orifice of valve 29 to a passage 39 to the space between lands 33 1 , 33 2 of valve 29, and through a line 41 leading to actuator 40 whilst the remainder of the supply fluid is passed through a second axial orifice in valve 29 to a passage 38 and through by-pass passages 44, 44 2 , 44¢ to the return line 61, and with spool valve 29 2 also actuated as shown in Fig. 4 by-pass passages 44, 44 2 are blocked by a land 34 of spool valve 29 2 and fluid from passage 38 is directed to the space between lands 34 1 , 34 2 of valve 29 2 and through a line 48 leading to actuator 47. In the event of spool valve 29, being in neutral and valve 29 2 actuated as shown in Fig. 3 no division of flow occurs at valve 29 and all the fluid from supply line 27 is directed into the space between lands 34 1 , 34 2 of valve 29 2 and thence through line 48 leading to actuator 47 which is thus actuated at a greater speed. Similarly with valves 29 1 , 29 2 , in neutral and either valve 29 3 or 29 4 actuated, all the pump delivery is passed either to motor 54 or 58. Actuation of spool valves 29 1 --- 29 4 to the left results in reverse stroke of its associated motor.</p> |
