The purpose of the present invention is to provide a scroll fluid machine, the reliability of which is ensured and which can be manufactured with high productivity. The present invention provides a scroll fluid machine comprising: a stationary scroll having a spiral wrap upstanding therefrom; an orbiting scroll provided facing the stationary scroll and orbiting; a casing provided outside the orbiting scroll; a drive shaft for causing the orbiting scroll to orbit; an orbiting bearing for transmitting the rotational movement of the drive shaft to the orbiting scroll; and a plurality of rotation prevention mechanisms for preventing the orbiting scroll from rotating. The scroll fluid machine is characterized in that: the rotation prevention mechanisms have crankshafts and also have crank bearings for supporting the crankshafts; and the gap between each of the crankshafts and the corresponding one of the crank bearings is set to be greater than the gap between the drive shaft and the orbiting bearing.

A rotary compressor accommodating an electric motor portion and a compression mechanism portion joined to the electric motor portion through a rotation axis in a sealed case, wherein the compression mechanism portion comprises a cylinder comprising a cylinder chamber, a roller moving eccentrically within the cylinder chamber, and a vane abutting the roller and partitioning an inside of the cylinder chamber into a compression chamber and an intake chamber. The vane is disposed by stacking two divided vanes in a height direction of the cylinder, which is an axis direction of the rotation axis, and where a height dimension of one divided vane is H, and a minute gap between a height dimension of the cylinder and a height dimension of the two stacked divided vanes is L, a proportion of the minute gap L to the vane height dimension H per one divided vane is $$\mathrm{0.001}<\mathrm{L}/\mathrm{number\; of\; divided\; vanes}/\mathrm{H}<\mathrm{0.0015.}$$

Die Erfindung betrifft eine Drehkolbenvakuumpumpe mit einer Welle (10, 14), einem auf dieser angeordneten Kolben (12, 16), einem Gehäuse (1), und einer Festlageranordnung (24; 28), welche ein Vorspannelement (72) und ein Wälzlager aufweist, welches einen Innenring (64), einen Außenring (66) und Wälzkörper (68) umfasst. Um gute Vakuumdaten bei einer einfachen Konstruktion zu erzielen, wird vorgeschlagen, dass zwischen Vorspannelement und Außenring ein Ausgleichselement (74) angeordnet ist, welches derart gestaltet ist, dass es zusammen mit dem Vorspannelement in einem Masstoleranzbereich (ΔS) eine in einem Wälzlagervorspannungsbereich (ΔF) liegende Kraft bewirkt.

An oil pump of the present invention includes a housing (10, 20), a rotary shaft (30) which is supported by the housing, an inner rotor (71, 81) which is rotated in the housing integrally with the rotary shaft, an outer rotor (72, 82) which is rotated in the housing as being interlocked with the inner rotor, a rotor case (40) which is fitted into the housing and which contains the inner rotor and the outer rotor and supports an outer circumferential face of the outer rotor in a slidable manner, a side plate (50) which is arranged to be in contact with at least one annular end face of the rotor case, and an elastic member (60) which exerts an urging force to press the side plate to the annular end face of the rotor case. According to the above, slide resistance and operational torque can be reduced and side clearance can be maintained at constant.

[Problem]

In an electrically-driven compressor having an axial-gap-type motor where a stator is arranged on both sides of a rotor in the axial direction, air gaps formed on both sides of the rotor are properly ensured by accurately restricting an axial position of the rotor with respect to a housing.

[Solution]

An electrically-driven compressor includes an axial-gap-type motor 3 having a first stator 13 and a second stator 14 which are arranged on both sides of a rotor 12 fixed to a shaft 11 in the axial direction in an opposedly facing manner with air gaps formed therebetween, and a compression mechanism 4 driven by the motor 3. The first stator 13 is housed in a first housing member 5 and is fixed in the axial direction, and the second stator 14 is housed in a second housing member 6 assembled to the first housing member 5 and is fixed in the axial direction. A compressor rotor fixed to the shaft is housed in a space defined between a cylinder member 26 which is fitted in the first housing member 5 in the axial direction and a partition wall 5a which is formed on the first housing member 5 thus restricting an axial position of the compressor rotor.