| 摘要 |
PURPOSE:To control the number of cylinders in a simple constitution by providing a switch valve element for opening and closing a part of valve element passages of rotary valve elements in a common rotary shaft where rotary valve elements of suction and exhaust valves are formed. CONSTITUTION:A suction valve and an exhaust valve comprising rotary valve elements 10, 11 formed on a common rotary shaft 12 are provided on a suction port and an exhaust port of each cylinder, and valve passages 13, 14 for suction and exhaust are formed in such a manner as to pierce through the rotary shaft 12 along the diameter of the rotary shaft 12. The rotary valve elements 10, 11 for suction and exhaust of a cylinder paused by cylinder number control are formed like a hollow cylinder, and a cylindrical switch valve element 15 for opening and closing the respective valve element passages 13, 14 for auction and exhaust is slidably inserted in the interior thereof. The switch valve 15 is controlled to close the valve through a hydraulic cylinder 19 according to a cylinder reducing operation command output from a control circuit 18 when load detection means 17 detects the light load condition.
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