| 摘要 |
A rotary fluid pressure device includes a housing having a fluid inlet port and a fluid outlet port and defines a fluid sealing surface therein. An internally-toothed member is provided, and an externally-toothed member is eccentrically disposed therein for relative orbital and rotational movement. The teeth of the members interengage to define a plurality of expanding and contracting volume chambers during the relative movement therebetween. A valve means is connected for synchronous movement with either the orbital or rotational movement of one of the toothed members to connect one of the fluid ports in fluid communication with the expanding volume chambers and the other fluid port in fluid communication with the contracting volume chambers. Each of the toothed members has an axial end face disposed in engagement with a portion of the sealing surface defined by the housing. The sealing surface and one of the axial end faces cooperate to define a sealing land radially adjacent the volume chambers, and at least one area of relieved pressure, the sealing land being disposed radially between the volume chambers and the relieved area. A passage means is disposed within the housing for connecting the relieved area in open communication with whichever one of the fluid ports is at a lower fluid pressure to reduce the area between the sealing surfaces and end faces subjected to fluid pressure, to thereby reduce the force tending to separate the end face from the adjacent sealing surface during operation of the device. |
