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モ−タを構成するステ−タを円筒状の密閉ケ−ス内の円筒部に固定し、その円筒を閉じる両端面に固定した第一及び第二支持部材に設けた軸受に両端部が回転自由に支持された円筒状のシリンダとそれより偏心して設けられた円柱状のピストン及びシリンダとピストンを機械的に連結するオルダム機構で構成されたヘリカルブレ−ド式ポンプおいて、前記第一ないしは第二支持部材内の内側に設けた矩形穴内に、ピストンを支える軸受Ｐを内側に有し外側表面には一方向の直線移動が可能な平坦なスライド面８ｂを設けたおよそ角柱状のスライドブッシュ８をピストンを支える片軸側ないしは両軸側に装着してピストンの偏心量可変機構が構成されたことを特徴とするヘリカルブレ−ド式ポンプ。The stator that constitutes the motor is fixed to the cylindrical part in the cylindrical sealing case, and both ends rotate on the bearings provided on the first and second support members fixed to both end faces of the cylinder. In the helical blade type pump comprising a freely supported cylindrical cylinder, a cylindrical piston provided eccentrically therefrom, and an Oldham mechanism for mechanically connecting the cylinder and the piston, the first or the second In a rectangular hole provided inside the two support members, a roughly prismatic slide bush 8 provided with a bearing P for supporting the piston on the inside and a flat slide surface 8b capable of linear movement in one direction on the outer surface. A helical blade type pump characterized in that a piston eccentricity variable mechanism is configured by mounting a shaft on one or both shafts supporting the piston.シリンダ内側円筒の軸心とこれより平行に偏心したピストン外側円筒の軸心を含む平面に対して傾斜させた平坦面を設けた第一ないしは第二支持部材とこの平坦面に密着するようなスライド面を設けたスライドブッシュ８を第一ないしは第二支持部材内に装着して構成されたことを特徴とする請求項１記載のヘリカルブレ−ド式ポンプ。A first or second support member provided with a flat surface inclined with respect to a plane including the axis of the cylinder inner cylinder and the axis of the piston outer cylinder eccentrically parallel to the cylinder, and a slide that is in close contact with the flat surface 2. The helical blade type pump according to claim 1, wherein a slide bush having a surface is mounted in the first or second support member.スプリングやゴム等で構成された弾性部材９を、第一ないしは第二支持部材の平坦面とスライドブッシュの平坦面が合わさるスライド面でスライドブッシュが移動する方向に弾性力が作用するように、第一ないしは第二支持部材とスライドブッシュとの間に装着させて構成されたことを特徴とする請求項１または２記載のヘリカルブレ−ド式ポンプ。The elastic member 9 composed of a spring, rubber, or the like is arranged so that the elastic force acts in the direction in which the slide bush moves on the slide surface where the flat surface of the first or second support member and the flat surface of the slide bush are combined. 3. The helical blade pump according to claim 1, wherein the helical blade pump is mounted between the first or second support member and the slide bush.
Variable compression ratio internal combustion engine, gear structure and method for assembling gear in variable compression ratio internal combustion engine