Abstract: A centrifugal casting apparatus including: a lower half-mold (10) mounted on a support (12) provided with driver for rotation about a substantially vertical central axis (14), the lower half-mold (10) being a solid of revolution having a first central cavity (36); an upper half-mold (16) facing the lower half-mold (10), the upper half-mold (16) being a solid of revolution having a second central cavity (56); and a device for causing the axial movement of the half-molds (10, 16) towards and away from each other. The lower half-mold (10) and the upper half-mold (16) each have at least one passage (46, 66) which puts the respective central cavity (36, 56) into communication with the outside through an outlet aperture through which the central axis (14) does not pass.

Abstract: The centrifugal casting apparatus comprises: a lower half-mould (10) mounted on a support (12) provided with driving means for rotation about a substantially vertical central axis (14), the lower half-mould (10) being a solid of revolution having a first central cavity (36); an upper half-mould (16) facing the lower half-mould (10), the upper half-mould (16) being a solid of revolution having a second central cavity (56); and means for causing the axial movement of the half-moulds (10, 16) towards and away from each other. The lower half-mould (10) and the upper half-mould (16) each have at least one passage (46, 66) which puts the respective central cavity (36, 56) into communication with the outside through an outlet aperture through which the central axis (14) does not pass.

Abstract: The stator is formed by a pack (10) of stacked magnetic laminations (12), each of which has a central opening (14) and a plurality of peripheral holes (18), in such a way that the overlapping of identically shaped holes (18) in the laminations (12) defines respective passages through the pack (10). The faces of the laminations (12) are substantially flat and retaining means are associated with the holes (18) in an end lamination (12a) of the pack (10), these means protruding into the openings of the respective holes (18) in the end lamination (12a) without interfering with the other laminations (12) of the pack (10).

Abstract: The stator is formed by a pack (10) of stacked magnetic laminations (12), each of which has a central opening (14) and a plurality of peripheral holes (18), in such a way that the overlapping of identically shaped holes (18) in the laminations (12) defines respective passages through the pack (10). The faces of the laminations (12) are substantially flat and retaining means are associated with the holes (18) in an end lamination (12a) of the pack (10), these means protruding into the openings of the respective holes (18) in the end lamination (12a) without interfering with the other laminations (12) of the pack (10).

Abstract: A method of assembling electric power supply cables on a stator of an electric motor including the following steps: electrically connecting an end of each cable to an end of at least one respective wire of the winding; inserting each pair of connected ends into a respective small tube of a protection and positioning element made of insulating plastic and having a strip from which a number small tubes at least corresponding to the number of electric power supply cables transversally protrudes; clamping each small tube so as to fix it to the pair of ends inserted inside it; inserting an end of the strip inside a cavity of the pack, so that the small tubes are located within the head; and tying the winding in the region of the head so as to enclose the small tubes.

Abstract: The method relates to the assembly of electric power supply cables (10) on a stator (12) of an electric motor, formed by a pack (14) of magnetic laminations and at least one winding of bundles of electrically conductive wires (16), which is housed inside cavities (18) formed in the pack (14) and has at least one head (20) projecting from the pack (14).

Abstract: A method of manufacturing a compressor valve plate (36) comprises at least the following steps in succession: blanking of a blank of the plate (36) from a steel sheet of suitable thickness, punching holes corresponding to the output and intake openings, the hole corresponding to the output opening being a preliminary hole (48a) having a diameter larger than the final diameter of this opening (48), forming, by coining, a depression (42) for housing an output valve-closure blade (54), with the depth of the depression increasing towards the end of the depression which corresponds to the preliminary hole (48a), in a manner such that, during the coining, at least some of the material of the blank creeps towards the preliminary hole, partially filling it, calibrating the output opening (48) to the final diameter by punching, and coining an annular projection (50) around the calibrated output opening (48) to define a valve seat for the output closure blade.

Abstract: The hollow body of an intake silencer comprises a pair of matching insert (42,44) of rigid moulded plastics material which are confined in a lower-cup shaped element (28) by a lid (30) and which together have a T-shaped configuration with a longitudinal partition (46) which corresponds to the leg of the T and which extends in the lower element (28) dividing it into two juxtaposes resonance chambers (88, 90), and with a transverse partition (48-56) which corresponds to the transverse portion of the T and which separated the juxtaposed resonance chambers (88, 90) from an upper outlet chamber (96). Each insert (42, 44) comprises a respective upper flange (48, 56) corresponding to a respective half of the transverse partition.

Abstract: A gudgeon pin (14) is held in engagement with a bearing seat situated inside a piston (16) by retaining means in the form of a pincer element (30) with a base portion (32) fixed to the end wall (20) of the piston (16) and with two pairs of resilient jaws (38) arranged on either side of the small end (12) of the connecting rod (10) and shaped so as to grasp the gudgeon pin (14) and hold it in the scat by a snap-coupling.

Abstract: A motor-driven compressor unit (12) suspended in a hermetic housing (10) comprises a casing (24) which encloses the stator (16) of the electric motor externally and to which the stator is fixed. The casing (24) carries and is fixed firmly to a block (36) of the compressor and further comprises a transverse wall (28) situated at the opposite end to the block. The block (36) and the transverse wall (28) have respective annular seats (56, 60) concentric with the axis of rotation of the crankshaft (46). The annular seat (56) in the block (36) contains a main self-aligning bearing (86) and the annular seat (60) in the transverse wall (28) of the casing (24) contains a secondary self-aligning bearing (64).

Abstract: A motor-driven compressor comprises a drive shaft driven by an electric actuator and acting on a crank mechanism having a crank with which a connecting rod is associated eccentrically, the connecting rod supporting a piston movable in a corresponding cylinder. The cylinder has a longitudinal axis W inclined to the axis X of the drive shaft at an angle other than 90 n degrees so that the connecting rod supporting the piston has a longitudinal axis K which intersects the plane in which the crank lies.

Abstract: The connecting rod comprises two separate main pieces (34, 36) one of which includes a small-end part (38), a stem part (40) and a big-end fork part (42). The other piece is constituted by a cap (46). The big-end fork part (42) and the cap (46) are retained together by means of respective pairs of interfitting ends situated in correspondence with a diametral plane of the eye of the big-end. The interfitting ends of each pair have mutual coupling formations (48).