Abstract: A housing forms one portion of a compressor case and supports a bearing for a main shaft has an opening through which gas Is sucked; a suction space extending from the opening to inside of the compressor; a first gas passageway extending from the suction space in the direction of the axis of the main shaft; a second gas passageway connecting the first gas passageway and the space in which the main shaft bearing is disposed. A shell forms the other portion of the compressor case and is fastened to the housing has a third gas passageway connecting the first gas passageway and the internal space of a compression mechanism. The first gas passageway and the third gas passageway are connected to each other further on the outer side of the main shaft in the rotation radius direction than the movable region of the bottom plate of a movable scroll.

Abstract: A scroll-type fluid machine in which: a fixed scroll and a moveable scroll are disposed in a housing; a fluid pocket, the volume of which varies, is formed between the fixed scroll and the moveable scroll; and a thrust plate for receiving the reaction force in the axial direction of pressure applied within the fluid pocket is disposed between the bottom plate of the moveable scroll and the housing. The scroll-type fluid machine is characterized in that at least the surface of the thrust plate facing the bottom plate of the moveable scroll is subjected to tin plating. As a consequence, it is possible to efficiently produce, at a low cost, a thrust bearing which is disposed between the bottom plate of the moveable scroll and the housing, exerts excellent seizure resistance, and has a high PV limit level and a low friction coefficient.

Abstract: A scroll-type fluid machine (1, 88) in which a fixed scroll (8) and a movable scroll (10), in consort, demarcate a compression or expansion chamber (60) of a lubricant-containing working fluid, the fluid machine having a housing (4) provided with a port (16) through which the working fluid passes, and a pedestal section (62) in which the port opens, and which is applied with thrust load on the back face (64) side of an end plate (10a) of the movable scroll due to the demarcation of the compression or expansion chamber. The pedestal section has a groove (72, 90) formed in a region including an opening of the port.

Abstract: There is provided an idling engine speed control apparatus which can economically and suitably control an idling engine speed in the case where a variable displacement type compressor with a variable displacement is mounted is a part of an automotive air conditioning system. A the time of idling, a duty ratio of a control valve current value sent as an external signal to a control valve is sent also to an engine controller, and the engine control apparatus controls the output of an engine on the basis of the duty ratio. For example, when the duty ratio becomes high from a small value, since the present operating state of the compressor is in the direction where the differential pressure becomes high and the displacement is increased, it is expected that a large load is applied to the engine. Thus, in this case, the engine output is controlled correspondingly to a large duty ratio and the idling engine speed is made high.

Abstract: To provide a gas compressor capable of reducing the pressure loss of the oil containing high-pressure refrigerant gas and achieving an improvement in compressor performance. In a construction in which oil containing high-pressure refrigerant gas discharged from cylinder discharge holes passes through discharge chambers and discharge gas passages to be led to oil separation filters side attached to an oil separator, the discharge gas passages are linear, whereby the oil containing high-pressure refrigerant gas flows smoothly through the discharge gas passages, and the pressure loss of the oil containing high-pressure refrigerant gas is reduced. Further, the height of inlet openings of the discharge gas passages are set to be the same as the height of outlet openings, whereby the discharge gas passages extend horizontally and are of the shortest length, thereby further reducing the pressure loss of the high-pressure refrigerant gas.

Abstract: A gas compressor has a first chamber for receiving a low pressure refrigerant gas. A main body has a second chamber for drawing in the low pressure refrigerant gas from the first chamber and undergoing a compression operation to compress the low pressure refrigerant gas into a high pressure refrigerant gas. A third chamber receives the high pressure refrigerant gas from the second chamber. A fourth chamber receives a lubricating oil and is subjected to the pressure of the high pressure refrigerant gas from the third chamber. An oil passage has an inlet port opening into the fourth chamber and an outlet port opening into the main body. The lubricating oil from the fourth chamber is supplied to the main body through the oil passage due to a pressure difference between the third chamber and one of the first chamber and the second chamber.

Abstract: Two oil passages are defined in a cylinder unit of a rotary compressor for feeding lubrication oil to front and rear bearings. The bearings bear a shaft of a rotor unit relative to the cylinder unit. At least one of the two oil passages is formed with an orifice which is defined by the cylinder unit.

Abstract: A rotary vane compressor comprises a cylinder having two closed ends defining a cylinder chamber in which is rotatably mounted a rotor. The rotor carries a plurality of radially movable vanes which move radially into sliding contact with the inner surface of the cylinder chamber during rotation of the rotor to compress a refrigerant gas. The rotor is rotationally driven by a rotor shaft rotatably mounted by bearings in the cylinder ends. To prevent destruction of the ozone layer, a refrigerant containing no chlorine, such as HFC-134a (1,1,1,2-tetrafluoroethane; CH.sub.2 FCF.sub.3) is used, and to compensate for the inferior lubricating properties of the chlorine-free refrigerant, the bearings are provided with a manganese phosphate coating of 10 .mu.m-15 .mu.m thickness to prevent cohesion and seizure of the mutually contacting surfaces of the bearings and rotor shaft.