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In a rotary fluid machine for converting the reciprocal movement of pistons and the rotational movement of a rotor from one into another by the engagement of rollers and annular grooves with each other, a value in a positive peak region of a pressure load of pistons received by the rollers engaged i

In a rotary fluid machine for converting the reciprocal movement of pistons and the rotational movement of a rotor from one into another by the engagement of rollers and annular grooves with each other, a value in a positive peak region of a pressure load of pistons received by the rollers engaged in the annular grooves and a value of a positive peak region of a centrifugal force load received by the rollers are set, so that they are substantially equal to each other, and phases of the two peak regions are deviated from each other. In addition, the phase negative peak region of a vane pushing-down load received by the rollers and the phase of the positive peak region of the pressure load of the pistons received by the rollers are established, so that they are overlapped at least partially on each other.

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1. A rotary fluid machine includinga casing (7) having a rotor chamber, a rotor (31) rotatably accommodated in said rotor chamber (14), cylinders (39) mounted radially in said rotor (31), pistons (41) for sliding in said cylinders (39), rollers (59) for moving in operative association with said pist

1. A rotary fluid machine includinga casing (7) having a rotor chamber, a rotor (31) rotatably accommodated in said rotor chamber (14), cylinders (39) mounted radially in said rotor (31), pistons (41) for sliding in said cylinders (39), rollers (59) for moving in operative association with said pistons (41), and non-circular annular grooves (60) provided in said casing (7) to guide said rollers (59), so that a pressure energy of a working fluid flowing into and out of said cylinders (39) and a mechanical energy for rotating said rotor (31) can be converted from one into another by converting the reciprocal movement of said pistons (41) and the rotational movement of said rotor (31) from one into another by the engagement of said rollers (59) and said annular grooves (60) with each other, wherein a value in a positive peak region of a pressure load of the pistons (41) received by said rollers (59) and a value of a positive peak region of a centrifugal force load received by said rollers (59) are set, so that said values are substantially equal to each other, and phases of said two peak regions are deviated from each other, whereby a peak value of a resultant force of the pressure load and the centrifugal force load of the pistons (41) received by said rollers (59) and an amount of variation in each of the loads are suppressed to a small level. 2. A rotary fluid machine according to claim 1, further including vanes (42) for moving radially into and out of said rotor (31) in operative association with said rollers (59), outer peripheral surfaces of said vanes (42) being in sliding contact with an inner peripheral surface (45) of said rotor chamber (14),so that the pressure energy of the working fluid flowing into and out of vane chambers (54) each defined by a pair of adjacent ones of said vanes (42), said rotor chamber (14) and said rotor (31) and the mechanical energy for rotating said rotor (31) can be converted from one into another; and the phase of a negative peak region of a vane pushing-down load received by said rollers (59) and the phase of the positive peak region of the pressure load of said pistons (41) received by said rollers (59) being established so as to be overlapped at least partially on each other.