| 摘要 |
A rotor cavity is defined by a housing and the cavity includes a generally cylindrical chamber interrupted by a pair of ramp surfaces lying generally along chords of the cavity disposed normal to radii of the cavity displaced approximately 90 DEG apart. A rotor is journaled in the cavity and includes a plurality of equally circumferentially spaced generally radial piston receiving cylinder bores and a piston is reciprocally mounted in each cylinder bore and includes an outer end roller rollingly engaged with the wall surfaces of the cavity including the aforementioned ramp surfaces. Opposite sides of the rotor are provided with inlet and outlet ports opening into the inner ends of the cylinders or piston bores and the cavity is closed by opposite end walls between which the rotor is received and the end walls are provided with inlet and outlet openings with which the intake and exhaust ports formed in the rotor are sequentially registrable.
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