A compressor includes a closed container housing a compression element driven by the shaft of a motor. The compression element includes a first and second bearings supporting first and second shaft portions, and at least one cylinder having at least one cylinder chamber disposed between the first and second bearings. At least one roller is fitted to the shaft in the at least one cylinder chamber. The first bearing is disposed closer to the motor than the second bearing. The first and second bearings have first and second annular grooves opened to the at least one cylinder chamber and first and second elastic portions provided in first and second opposing surfaces, respectively. A diameter of the second shaft portion is smaller than a diameter of the first shaft portion. A rigidity of the second elastic portion is smaller than a rigidity of the first elastic portion.

The multiple cylinder rotary compressor includes a compressor body including a hermetic case, the hermetic case housing inside a rotating shaft, an electric motor section, and a compression mechanism body. The compression mechanism body includes at least three compression mechanism sections which stack with each other, partition plates between the corresponding adjacent compression mechanism sections, and a primary bearing and a secondary bearing supporting the rotating shaft on both end sides of the compression mechanism body. The compression mechanism sections include a cylinder forming inside a cylinder chamber, an eccentric section provided to the rotating shaft, disposed in the cylinder chamber, a roller fitted to the eccentric section, rotating eccentrically within the cylinder chamber, and a blade dividing the inside of the cylinder chamber into two. At least one partition plate constitutes a partition plate bearing supporting the rotating shaft.

A scroll compressor includes a bush having a shaft part and a balance weight part. The shaft part is disposed between an orbiting bearing that supports an orbiting scroll, and an eccentric pin of a crankshaft. The balance weight part is secured to the outer periphery of the shaft part by shrink-fitting. The shaft part includes: a cylindrical body part which is fitted into the orbiting bearing, and into which the eccentric pin of the crankshaft is inserted; and a cylindrical coupling part which extends outward from an axial end portion of the body part, and to which the balance weight part is joined. The bush satisfies the following requirements:

1.2D2/D11.6, and(a)

1.0(D2D3)/(D4D2)E1/E23.5,(b)

where D1 is the outer diameter of the body part, D2 is the outer diameter of the coupling part, D3 is the inner diameter of the body part, D4 is the outer diameter of the balance weight part, E1 is the Young's modulus of the shaft part, and E2 is the Young's modulus of the balance weight part.

A compressor including a shell, a scroll assembly, and driveshaft. The scroll assembly includes an orbiting scroll including a orbiting spiral wrap and a second opening including a drive bearing disposed therein. The drive bearing is axial aligned with the orbiting spiral wrap. The compressor includes an unloader rotationally connected to the driveshaft body and rotationally supported with a primary bearing.

A scroll compressor includes a compression mechanism, a crankshaft, upper and lower bearings, and a drive motor. The compression mechanism includes fixed and movable scrolls engaged with each other to form a compression chamber. The crankshaft has a main shaft and an eccentric portion eccentrically disposed at one end of the main shaft and coupled to a back side of the movable scroll. The upper and lower bearings support upper and lower portions of the main shaft. The drive motor has a stator and a rotor coupled to the main shaft to rotate the movable scroll. At least one of the main shaft and the rotor is provided with a weight arranged to reduce distortion of the crankshaft caused by a fluid load generated in the compression chamber and applied to the eccentric portion during rotation.

An internal combustion engine having at least one crankcase for defining a guide housing in which at least one crankshaft is guided in rotation about an axis of rotation and lubricated by a lubricating fluid, the at least one crankcase being of the dry-sump type. Such an internal combustion engine has at least two pumps forming a pump train of pumps on a common axis, the pump train being fitted in a cylindrical bore of the at least one crankcase.

A liquid pump/motor combination powered by an electric motor, preferably, an oil pump or reducing-agent pump with an electric motor, a positive displacement pump and a bearing shield arranged between the electric motor and the positive displacement pump. The liquid pump/motor combination comprises a positive displacement pump; an electric motor; and a bearing shield having a contact face, the bearing shield arranged between the electric motor and the positive displacement pump. A spherical bearing is accommodated in the bearing shield, the spherical bearing, under application of a force, being able to swivel to a limited extent. A connecting shaft is accommodated in the spherical bearing. The connecting shaft is positioned between the electric motor and the pump. An annular bearing gap, filled with liquid, is between the inside diameter of the spherical bearing and the connecting shaft. The arrangement functions as a hydrodynamic sliding bearing.

A compressor and an air conditioner. The compressor includes a crankshaft, a first roller, a second roller, a motor rotor and one balancing block. The interior of the first roller is a solid structure, and the interior of the second roller has a hollow portion. The balancing block is disposed at one axial end of the motor rotor, and no balancing block is arranged at another axial end of the motor rotor. A mass center of the first eccentric portion and the first roller is a first mass center, and a first mass-center axis passes through the first mass center and is parallel to an axis of the crankshaft. A mass center of the second eccentric portion and the second roller is a second mass center, and a second mass-center axis passes through the second mass center and is parallel to the axis of the crankshaft.

A compressor includes a housing, a motor disposed in the housing, a driving shaft connected to the motor, a first compression mechanism connected to the driving shaft, and a second compression mechanism. The second compression mechanism includes a stationary scroll and an orbiting scroll engaged with each other, a bushing seat positioned at an end portion of the driving shaft, a bushing, and a bearing. A main axis of the driving shaft passes through a positioning protrusion of the bushing seat, and the positioning protrusion is deflected at an angle relative to a straight line connected by a plurality of contact points between the orbiting scroll and the stationary scroll. The bushing is sleeved on the positioning protrusion, and a center line of the bushing is eccentric to the main axis. The bearing is sleeved on the bushing, and the orbiting scroll is sleeved on the bearing.

A scroll compressor includes a compression mechanism, a crankshaft, and a drive motor. The compression mechanism has a fixed scroll and a movable scroll and is configured to compress a fluid. The crankshaft has a main shaft and an eccentric portion eccentrically disposed at one end of the main shaft and coupled to a back side of the movable scroll. The drive motor has a stator and a rotor coupled to the main shaft of the crankshaft to rotate the movable scroll. At least one of the main shaft of the crankshaft and the rotor of the drive motor is provided with a weight. The weight being is arranged to balance a centrifugal force of the movable scroll during rotation, and to reduce warpage of the crankshaft caused by balancing the centrifugal force of the movable scroll.