| 摘要 |
PURPOSE:To keep off any seizure or binding between a rotor and a cylinder with certainty by forming a cooling oil passage, circulating fuel, in the inside or outer circumferential part of a rotor distributing part, cooling the roller, and thereby checking any increase in a diameter due to thermal expansion in the rotor. CONSTITUTION:Each of cooling oil passages 60, 61 being formed in the inner part of a rotor 13 is always interconnected to a cooling oil feed port whose upstream side is formed in a cylinder 12. Each tip of the cooling oil passages 60, 61 extending in a rotor axial direction is interconnected to cooling ports 62, 63 being bent in the rotor diametral outer direction, and these cooling ports 62, 63 are opened to the circumference of a rotor small diametral part 13a. Fuel circulates the cooling port 63, a cooling oil recovery passage 70 and a fuel recovery passage 71 by way of the cooling oil passage 60, 61 in the rotor from a feed pump 2. Thus, since the rotor 13 rotating at high speed is cooled, any thermal expansion in the rotor 13 is checked, so that any seizure or binding with the cylinder 12 is preventable. |
