Abstract: The present invention describes a reciprocating compressor, comprising: an assembly block (10); a rotating shaft (20) comprising at least one inner axial channel (21), said inner axial channel (21) connected to at least one inner radial channel (22a, 22b) or to a cam (23); the cam (23) is associated with a connecting rod (24), and the connecting rod (24) is associated with a movable piston (25) within a compression cylinder (26); and an oil pump (C), comprising: an axial flow electric motor comprising a rotor (30), with magnets (31), and a stator (40) with coils (41); wherein the rotor (30) and the stator (40) are fixed to the shaft (20) and to the assembly block (10), respectively, by means of bearings or fixing arrangements.

Abstract: The present invention belongs to the technological field of cooling compressors and, particularly, constructive details of lubricating oil pumps of cooling compressors. Problem to be solved: The current state of the art does not describe any solution of oil pump and construction of rotating shaft capable of achieving the correct lubricating of the moving components that include the compression functional unit of cooling compressor, which operating speed can vary between 700 and 4500 rpm. Solution of the problem: It is disclosed is a variable speed cooling compressor which tubular extension of the oil pump, the inner axial channel of the rotating shaft, the axial channel extension of the rotating shaft and the inner cam channel segment of the rotating axis are all fluidly connected to each other in order to conform a single integrated channel.

Abstract: The connecting rod includes a first portion of the connecting rod to be mounted on the eccentric pin of a crankshaft of the compressor and a second portion of the connecting rod to be articulated in a reciprocating piston within a cylinder. One of the first and second portions of the connecting rod includes a tubular stem portion that receives, telescopically and loosely, and retains, by radial inward deformation, a portion of the engagement stem of the other portion of the connecting rod, said stem portions being held together, in an axial and rotational alignment condition, before being attached by a fixation mean in a relative axial positioning, which results in a portion of the compression chamber and a respective portion of dead volume in the condition of upper dead point of the piston.

Abstract: The connecting rod comprises a first portion of the connecting rod to be mounted on the eccentric pin of a crankshaft of the compressor and a second portion of the connecting rod to be articulated in a reciprocating piston within a cylinder. One of the first and second portions of the connecting rod comprises a tubular stem portion that receives, telescopically and loosely, and retains, by radial inward deformation, a portion of the engagement stem of the other portion of the connecting rod, said stem portions being held together, in an axial and rotational alignment condition, before being attached by a fixation mean in a relative axial positioning, which results in a portion of the compression chamber and a respective portion of dead volume in the condition of upper dead point of the piston.

Abstract: The arrangement of the present invention is applied to a compressor which comprises a bearing hub housing a crankshaft and presenting at least a first and a second bearing portion, spaced apart by a circumferential recess. The crankshaft presents at least a first and a second support portion, spaced apart by a circumferential recess, which is offset from the circumferential recess of the bearing hub. At least one of the bearing portions and support portions has an axial extension superior to that required for radially bearing the crankshaft, the first and second bearing portions defining, with the first and second support portions, respectively, a first and a second radial bearing regions having the axial extensions required for a radial bearing for the crankshaft, presenting lower loss by viscous friction.

Abstract: The arrangement of the present invention is applied to a compressor which comprises a bearing hub housing a crankshaft and presenting at least a first and a second bearing portion, spaced apart by a circumferential recess. The crankshaft presents at least a first and a second support portion, spaced apart by a circumferential recess, which is offset from the circumferential recess of the bearing hub. At least one of the bearing portions and support portions has an axial extension superior to that required for radially bearing the crankshaft, the first and second bearing portions defining, with the first and second support portions, respectively, a first and a second radial bearing regions having the axial extensions required for a radial bearing for the crankshaft, presenting lower loss by viscous friction.

Abstract: The present invention refers to a crankshaft (1) for an alternative compressor comprising a main shaft (21) connected to an eccentric pin (2) by means of a peripheral flange (3) containing a lubricating hole (24) extending through said eccentric pin (2) and through at least part of the body of main shaft (21), one of the edges of said hole (24) being on the cylindrical surface (2a) of said eccentric pin (2). With this type of hole, the present invention allows for the use of shafts having extremely low diameters (and, as result, with low viscous loss), even with high eccentricities, whereby an excellent capacity of oil pumping and mechanical strength is maintained.

Abstract: The present application relates to an oil pump assembly arrangement for cooling compressors. Such invention aims to provide said compressor with a better use of the inner space defined by the housing thereof, in order to allow its miniaturization. To this end, it is proposed that fastening rod, which is able to anchor pin of the oil pump in a fixed portion of electric engine, is supported, in the median portion thereof, in a hole provided next to pin and, in the ends thereof, in respective cribs defined in a fixed portion of electric engine, wherein the housing in these cribs takes place by inner sides thereof and, still, wherein fastening rod extends through free spaces defined between coils, guaranteeing the minimum electrical distances required by rules.

Abstract: The present invention belongs to the technological field of cooling compressors and, particularly, constructive details of lubricating oil pumps of cooling compressors. Problem to be solved: The current state of the art does not describe any solution of oil pump and construction of rotating shaft capable of achieving the correct lubricating of the moving components that include the compression functional unit of cooling compressor, which operating speed can vary between 700 and 4500 rpm. Solution of the problem: It is disclosed is a variable speed cooling compressor which tubular extension of the oil pump, the inner axial channel of the rotating shaft, the axial channel extension of the rotating shaft and the inner cam channel segment of the rotating axis are all fluidly connected to each other in order to conform a single integrated channel.

Abstract: The connecting rod includes a first portion of the connecting rod to be mounted on the eccentric pin of a crankshaft of the compressor and a second portion of the connecting rod to be articulated in a reciprocating piston within a cylinder. One of the first and second portions of the connecting rod includes a tubular stem portion that receives, telescopically and loosely, and retains, by radial inward deformation, a portion of the engagement stem of the other portion of the connecting rod, said stem portions being held together, in an axial and rotational alignment condition, before being attached by a fixation mean in a relative axial positioning, which results in a portion of the compression chamber and a respective portion of dead volume in the condition of upper dead point of the piston.

Abstract: The compressor includes a bearing hub, defining a radial bearing having a first and a second end portion and supporting a crankshaft having an eccentric end portion supporting the larger eye of a connecting rod coupled to the piston, for example, by a smaller eye mounted around a piston pin. The second end portion and, optionally, the first end portion of the bearing hub and the larger and smaller eyes of the connecting rod are internally provided with bushings. End portions of the bearing hub and of the larger and smaller eyes may have their structure resistant to the pressing of a confronting compressor component supported on said end portions, or further present a terminal portion elastically deformable together with a confronting terminal portion of the associated bushing.

Abstract: The arrangement of the present invention is applied to a compressor which comprises a bearing hub housing a crankshaft and presenting at least a first and a second bearing portion, spaced apart by a circumferential recess. The crankshaft presents at least a first and a second support portion, spaced apart by a circumferential recess, which is offset from the circumferential recess of the bearing hub. At least one of the bearing portions and support portions has an axial extension superior to that required for radially bearing the crankshaft, the first and second bearing portions defining, with the first and second support portions, respectively, a first and a second radial bearing regions having the axial extensions required for a radial bearing for the crankshaft, presenting lower loss by viscous friction.

Abstract: A reciprocating compressor and, particularly, constructive details of lubricating oil pumps of reciprocating compressors. A constructive arrangement introduced on reciprocating compressor including helical pump of lubricating oil where the rotating shaft includes at least one lower region and at least one intermediate region. On the lower region of the rotating shaft, the lubricating oil is pumped by an internal channel of the rotating shaft and on the intermediate region of the rotating shaft, the lubricating oil is temporary stored and transferred, for the rotating shaft bearing region. The cooperating region between the retaining pin and the rotating shaft is limited by the lower region. The lower region of the rotating shaft includes, on its external side, a contouring recess. These two features prevent the cooperating region of the lower channel of the lubricant oil conduction suffering deformation by assembling the rotating shaft on the electrical engine rotor.

Abstract: The compressor comprises: a crankcase (10) carrying a cylinder (20) and a bearing hub (40) having a first and a second end portions (40a, 40b) and defining a radial bearing (41), in which is housed a crankshaft (50); and a connecting rod (60) coupled to a piston (30) housed in the cylinder (20) and having a larger eye (61) mounted in an eccentric end portion (55) of the crankshaft (50). Each of said end portions (40a, 40b) is defined by a bushing extension (45, 46) affixed in the interior of the bearing hub (40) and having an end portion (45a, 46a) projecting outwards from the bearing hub (40), in order to be elastically and radially deformed when pressed by a confronting portion of the crankshaft (50), which presents coaxiality deviation in relation to the axis (X1) of the radial bearing (41).

Abstract: The arrangement is applied to a compressor which comprises: a crankcase, carrying a cylinder provided with a lateral slot and in which is housed a piston provided with two radial holes and with an eccentric axial hole; a connecting rod connected to a crankshaft driven by an electric motor and having a smaller eye mounted in the piston; and a wrist pin having a first end turned to the bearing hub of the crankcase, a second end turned to the lateral slot of the cylinder and a diametrical hole, adjacent to the second end in which is provided an engaging means, for the axial and rotational coupling of a tool for mounting and indexing the wrist pin, in the interior of the piston, in a position in which the diametrical hole is axially aligned with the eccentric axial hole, so as to allow an elastic pin to be introduced in said diametrical hole and in said eccentric axial hole.

Abstract: The compressor comprises: a crankcase (10) carrying a cylinder (20) and a bearing hub (40) having a first and a second end portions (40a, 40b) and defining a radial bearing (41), in which is housed a crankshaft (50); and a connecting rod (60) coupled to a piston (30) housed in the cylinder (20) and having a larger eye (61) mounted in an eccentric end portion (55) of the crankshaft (50). Each of said end portions (40a, 40b) is defined by a bushing extension (45, 46) affixed in the interior of the bearing hub (40) and having an end portion (45a, 46a) projecting outwards from the bearing hub (40), in order to be elastically and radially deformed when pressed by a confronting portion of the crankshaft (50), which presents coaxiality deviation in relation to the axis (X1) of the radial bearing (41).

Abstract: The arrangement is applied to a compressor which comprises: a crankcase, carrying a cylinder provided with a lateral slot and in which is housed a piston provided with two radial holes and with an eccentric axial hole; a connecting rod connected to a crankshaft driven by an electric motor and having a smaller eye mounted in the piston; and a wrist pin having a first end turned to the bearing hub of the crankcase, a second end turned to the lateral slot of the cylinder and a diametrical hole, adjacent to the second end in which is provided an engaging means, for the axial and rotational coupling of a tool for mounting and indexing the wrist pin, in the interior of the piston, in a position in which the diametrical hole is axially aligned with the eccentric axial hole, so as to allow an elastic pin to be introduced in said diametrical hole and in said eccentric axial hole.

Abstract: The present invention refers to a crankshaft (1) for an alternative compressor comprising a main shaft (21) connected to an eccentric pin (2) by means of a peripheral flange (3) containing a lubricating hole (24) extending through said eccentric pin (2) and through at least part of the body of main shaft (21), one of the edges of said hole (24) being on the cylindrical surface (2a) of said eccentric pin (2). With this type of hole, the present invention allows for the use of shafts having extremely low diameters (and, as result, with low viscous loss), even with high eccentricities, whereby an excellent capacity of oil pumping and mechanical strength is maintained.

Abstract: The arrangement of the present invention is applied to a compressor which comprises a bearing hub housing a crankshaft and presenting at least a first and a second bearing portion, spaced apart by a circumferential recess. The crankshaft presents at least a first and a second support portion, spaced apart by a circumferential recess, which is offset from the circumferential recess of the bearing hub. At least one of the bearing portions and support portions has an axial extension superior to that required for radially bearing the crankshaft, the first and second bearing portions defining, with the first and second support portions, respectively, a first and a second radial bearing regions having the axial extensions required for a radial bearing for the crankshaft, presenting lower loss by viscous friction.

Abstract: The present invention is applied to a tribological pair comprising two metal pieces, a first of them having a movable contact surface which provides friction in relation to a respective contact surface of a second of said metal pieces. According to the present invention, the first metal piece has its contact surface defined by a coating formed: by a first surface layer in a material harder than that of the first metal piece; and by a second surface layer, disposed onto the first surface layer and in a material defining a coating which reduces the chemical affinity in relation to the contact surface of the second metal piece of the tribological pair, in order to provide, to said tribological pair, a lower friction coefficient in relation to the tribological pair deprived of said coating.