| 摘要 |
A sealing apparatus is disclosed for a device having variable volume chambers formed by the walls of a case and a piston. The device includes a piston assembly having an outer piston structure with an inner piston structure therein. The inner piston structure is mounted on an eccentric on a crank shaft, the rotation of which causes nutating movement of the inner piston structure and a reciprocal linear movement of the outer piston structure. First sealing elements are mounted on the outer piston structure to provide sealing for the chambers having the outer piston structure forming part of the chambers, and second sealing elements are mounted on the ported faces of the inner piston structure to provide sealing for the chambers having the inner piston structure forming part of the chambers. Each sealing element includes one portion received in grooves in the piston structures and another portion with a plurality of spaced raised sections which engage the case walls. Dams are provided in the first sealing element, O rings are also provided around the eccentric for sealing, and nutation guides are provided to assure nutating movement of the inner piston structure.
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