There is provided an exhaust casing for a turbocharger that can be reduced in weight and can be easily machined. The exhaust casing (1) for the turbocharger includes an exhaust casing body (2) for the turbocharger that has a hollow structure and is made of a casting of iron-based metal, a light metal layer (3) that serves as an outer shell, and a heat insulating layer (4) that is provided between the exhaust casing body (2) and the light metal layer (3).

The present invention provides a vertical, axial flow oil pump (10). The oil pump includes: a casing (11), the casing having a cylindrical shape as a whole and being able to rotate around its own central axis (O); a suction port (12), located at a lower end of the casing in an axial direction, and configured to suck oil into the oil pump; a discharge port (13), located at an upper end of the casing in the axial direction, and configured to discharge the oil from the oil pump to outside; and an impeller (14), provided in and formed integrally with the casing. The impeller rotates together with the casing when the casing rotates, so that the oil is flowed from the suction port to the discharge port. The present invention also provides a scroll compressor having the oil pump.

A rotor for a mud motor includes a core having a first outer shape, and a shell positioned around the core, the shell having a second outer shape that is different from the first outer shape, the second outer shape defining one or more lobes and one or more cavities that are configured to engage a bore of a stator during rotation of the rotor relative to the stator. A thickness of the shell varies as proceeding around the core, from a non-zero minimum thickness to a maximum thickness.

A vacuum booster assembly includes, but is not limited to, a booster housing defining a booster chamber and including a gas inlet and a gas outlet; a first rotor positioned within the booster chamber and adapted for rotation therein, the first rotor including a first shaft and at least two lobes defining a first lobe profile; and a second rotor positioned within the booster chamber and adapted for rotation therein, the second rotor including a second shaft and at least two lobes defining a second lobe profile, wherein the first and second rotors are formed from a metal having a coefficient of thermal expansion from about 1 (10.sup.−6 in/in*K) to about 13 (10.sup.−6 in/in*K), and wherein at least one of the outer surface of the first rotor, the outer surface of the second rotor, or the booster chamber includes a coating.

A compressor (20) comprises: a housing assembly (22) having a plurality of ports including a suction port (24) and a discharge port (26); a male rotor (30) mounted for rotation about an axis (500); a female rotor (32) enmeshed with the male rotor and mounted in the housing for rotation about an axis (502) for drawing a flow from the suction port, compressing the flow, and discharging the compressed flow through the discharge port. The housing assembly comprises: a motor case (54); and a cover (60) bearing the suction port. The cover comprises a unitary piece forming: a mounting portion (63) mounted to an adjacent end (55) of the motor case, said adjacent end being large enough to pass the motor; and a fitting portion (62) extending to a rim (66) at the suction port and bearing an external groove (200).

An improved screw-spindle pump, particularly for cooling systems, includes a first screw, a second screw and a pump housing, inside which the first screw and the second screw are rotatably housed between the first screw, the second screw and the pump housing, being defined pumping chambers adapted to move, as a consequence of the rotation of the first screw and the second screw, a fluid from a suction area to a delivery area of the pump. The pump housing housing the first screw and the second screw is made in one piece.

There is provided an exhaust casing for a turbocharger that can be reduced in weight and can be easily machined. The exhaust casing (1) for the turbocharger includes an exhaust casing body (2) for the turbocharger that has a hollow structure and is made of a casting of iron-based metal, a light metal layer (3) that serves as an outer shell, and a heat insulating layer (4) that is provided between the exhaust casing body (2) and the light metal layer (3).

A tubular portion; and flange portions at both ends of the tubular portion are included. A bent portion is formed between the two flange portions. The two flange portions are directly connected to each other.

The present invention comprises: a blank forming step in which a casing blank (70) is formed by die-casting, the casing blank (70) having a first cylindrical section (41), a second cylindrical section (42), and an annular section (44) which includes a recess (71) recessed toward one side in an axial direction (O) from a first surface (44a) facing the other side in the axial direction (O); and a cutting step in which the inner peripheral surface (42a) of the second cylindrical section (42) and a second surface (44b) of the annular section (44), the second surface (44b) facing the one side in the axial direction (O), are cut to connect the recess (71) to a compression section containing space (42A) within the second cylindrical section (42), thereby forming a flow passage. In the blank forming step, the casing blank (70) is formed such that a part of a side surface (71a) of the recess (71) is disposed radially outside the inner peripheral surface (42a) of the second cylindrical section (42).

Disclosed are a movable scroll device for a scroll compressor and a method for manufacturing same. The method includes: manufacturing the movable scroll device by means of casting steps, so that the movable scroll device includes a movable scroll end plate, with a movable scroll blade provided on a first side face of the movable scroll end plate; and a hub vertically extending outwards from the middle of a second side face of the movable scroll end plate; and fabricating at least one centroid adjustment recess on the hub. By the method, the centroid of the movable scroll device can be adjusted in a more flexible, precise, active and targeted manner.