Abstract: A suction inlet passage in a cylinder block of a rotary compressor includes a generally symmetrical diverging port which has generally conic cross-sections that divergingly open into a cylinder bore. The diverging port provides a buffer cavity which reduces pulsations and associated noise. The suction inlet passage is further provided with an entrance passage and a narrower passage, which is disposed between the entrance passage and the diverging port and which has a smaller cross-section than either the entrance passage or the diverging port. The suction inlet passage serves as a diffuser with the narrower passage functioning as the throat of the diffuser so as to increase volumetric efficiency with respect to the suction gas entering the cylinder bore. The diverging port extends the point of suction inlet close-off, and correspondingly enlarges the close-off angle, resulting in extending the period of unclosed compression and enhancing the supercharging effect.

Abstract: The annular piston of a rolling piston compressor coacts with a groove in valving action such that the groove serves as a supplemental discharge flow area but gas therein is prevented from constituting part of the suction flow. The groove may be in the motor end bearing and/or pump end bearing and permits flow from the compression chamber to the interior of the piston which is in fluid communication with the interior of the shell while the compression chamber is undergoing discharge.

Abstract: There are provided a highly durable and efficient refrigerating apparatus and a lubricating oil composition that uses an HFC type refrigerant and is still free from the problem of thermal hydrolysis of polyol-ester type oil and resulting generation of carboxylic acid and sludge so that the refrigerating apparatus and the lubricating oil composition may be used stably for a prolonged period of time. A lubricating oil composition according to the invention comprises as base oil components a polyol-ester type oil formed by reacting specific polyhydric alcohol with a fatty acid, to which tricresylphosphate and epoxy compound comprising glycidyl ether or carbodiimide are added at respective specific rates.

Abstract: A hermetic compressor which compresses compressed gas, comprising a sealing container, a compression mechanism which is housed in the sealing container and introduces the compressed gas into its inside to compress the compressed gas, and a frame for fixedly supporting the compression mechanism. A portion where the compression mechanism and the frame are abutted against each other, is provided with a solid propagation wave damping portion which damps a vibratory propagation by suddenly changing a cross section of a abutting portion.

Abstract: A rotary compressor includes a motor which rotates a crankshaft about an axis. The crankshaft includes an eccentric portion disposed in a cylinder which has a fluid inlet and a fluid outlet. A roller is mounted on the eccentric portion to be orbited within the cylinder when the crankshaft rotates, for compressing fluid. The eccentric portion and roller are together movable radially with respect to the axis in response to centrifugal force, so that the roller maintains tight contact with the cylinder.

Abstract: There is provided a rotary compressor comprising an electric driving element and a rotary compression element in a hermetically sealed casing and constituted by setting a round cylinder block of the rotary compression element between a main bearing and an auxiliary bearing both of which support a shaft of the electric driving element and joining and securing at least two joining ends of the cylinder block to the inner periphery of the hermetically sealed casing; in which the thickness between the outermost ends of the joining ends of the cylinder block is set to 45 to 85% of the maximum thickness of the cylinder block in the axis direction. The rotary compressor of the present invention makes it possible to greatly reduce the air column resonance in the hermetically sealed casing due to pressure pulsation of discharged gas and the vibration due to pressure pulsation in the cylinder block of the rotary compression element and moreover reduce noises during operation.

Abstract: A hermetic compressor which compresses compressed gas, comprising a sealing container, a compression mechanism, contained within said sealing container, for compressing said compressed gas, said compression mechanism including a rotary shaft, a motor for actuating the compression mechanism by driving the rotary shaft, first and second bearings, arranged individually on both sides of the compression mechanism, for journaling said rotary shaft, and a frame for fixedly supporting the compression mechanism, the frame comprises a frame body having a hollow portion in which said first bearing is situated, said frame body being fixed on one end surface of the compression mechanism and a bearing support portion for sealing the hollow portion of the frame body and supporting an outer peripheral portion of the first bearing.

Abstract: In a refrigerant compressor, a discharge valve assembly which reduces reexpansion volume. The present invention provides a discharge valve assembly for reciprocating, rotary, and scroll types of compressors, and includes a spherical valve member that engages and penetrates a discharge port provided on a compressor cylinder head, valve plate or scroll plate. The discharge port is formed in the cylinder head or scroll plate and is dimensioned such that the spherical member penetrates and substantially fills the discharge port. The reexpansion volume within the discharge port is thereby reduced. To maintain engagement of the spherical member with the discharge port, an elastically deformable arm having an aperture is positioned to hold the spherical member in the discharge port. The arm is elastically deformable to allow the spherical valve member to move out of engagement with the discharge port during the compression phase of the compressor.

Abstract: A hermetically sealed rotary compressor includes a generally cylindrical sealed vessel having an oil reservoir defined therein for accommodating a quantity of lubricating oil, a drive unit within the sealed vessel, and a compressor mechanism within the sealed vessel. The compressor mechanism includes a cylinder having a compression compartment defined therein and also having upper and lower openings, an eccentric cam provided on a crankshaft for rotation together therewith, and a ring-shaped piston mounted on the crankshaft while encircling the eccentric cam and capable of undergoing a planetary motion in contact with the eccentric cam during rotation of the eccentric cam. The cylinder has a refrigerant intake port defined therein in communication with the compression compartment.

Abstract: A relieved portion is provided in the motor end bearing of a rotary compressor in the region of the discharge port. The relief is in the nature of a chamfer or the like and enhances the flow by smoothing the flow path. The relief is limited to the portion of the motor end bearing overlying the cylinder bore so as to limit its contribution to the clearance volume.

Abstract: Lubrication deficiencies related to the use of synthetic lubricants such as POE oils in refrigeration compressors can be mitigated by providing a diamond-like-carbon coating on a member subject to wear due to lubrication deficiencies. Specifically, the tip of the vane of a rotary compressor is coated with a diamond-like-carbon coating made up of alternating layers of tungsten carbide and a lubricious material 0.5 to 5.0 microns thick.

Abstract: A rotary compressor is disclosed. The compressor reduces frictional loss in a contact part between the rolling piston and the eccentric sheave and in contact parts between the crankshaft and the main and sub bearings by achieving smooth lubrication to the contact parts. In the compressor, a lubricating groove is formed on the outer surface of the eccentric sheave. A hole communicating with the internal oil conduit of the crankshaft is formed in the lubricating groove and supplies oil from the oil conduit to the outer surface of the sheave. Lubricating grooves are also formed on the inner surfaces of the main and sub bearings so as to facilitate oil supply for the contact parts between the crankshaft and the bearings.

Abstract: A lubricating device for a horizontal type hermetic compressor. The device includes an oil cylinder at the back of a spring-biased vane in a compressing cylinder, and also includes an oil piston and an oil valve in the oil cylinder. The oil piston communicates with the oil valve by the movement of the vane, thus to achieve the lubrication oil supply through the oil cylinder. The oil piston is biased by a compression coil spring positioned under the piston, so that it is easy to fabricate the compressor. Since the length of the oil piston is longer than the distance between the upper dead point of the oil pumping chamber and the vane slot reference hole, introduction of refrigerant into the oil cylinder is reliably prevented. This device uses a conventional horizontal type hermetic compressor with a slight change of its construction and easily precisely controls the flow rate of the lubrication oil to be delivered.

Abstract: An oil supplying apparatus for a horizontal type rotary compressor capable of securing a substantial oil supplying and preventing oil leakage to the outside thereof thereby enhancing higher oil supplying efficiency of the compressor is disclosed.

Abstract: A rotary compressor comprises an outer casing, a rotary type compression mechanism accommodated in the outer casing in a sealed manner, and an electric motor for driving the rotary type compression mechanism. The rotary type compression mechanism is provided with a cylinder having an inner peripheral surface to which a discharge port is formed, and the inner peripheral surface of the cylinder has a portion formed of a valve sheet to which said discharge port is formed.

Abstract: The present invention concerns a noise reduction method and a noise reduction device for a hermetic rotary compressor. It is designed to reduce the very high level of low frequency sound generated by the compressor by preventing the formation of reflected waves along the circumference which produce the resonant sound mode, and thus by preventing the amplification of the low frequency gas pulsations. In the present invention, the amplitude of the reflected waves that form the resonant sound mode is reduced by installing the muffler outlets at one half the wavelength of the reflected waves in the cavity of the compressor housing from the exhaust valve where the compressed gas from the cylinder enters the muffler. By positioning these outlets to face each other so that, of the pulsating gas components form these two outlets, those at the frequency of the reflected waves formed in the circumferential direction of the cavity of the compressor housing will undergo a 180.degree.

Abstract: In a high side rotary compressor, interior shell pressure is used to force lubricant from the sump into the compression chamber. The lubricant is delivered only after the suction port has closed and before chamber pressure exceeds shell pressure.

Abstract: A hermetically sealed rotary compressor includes a generally cylindrical sealed vessel having an oil reservoir defined therein for accommodating a quantity of lubricating oil, a drive unit within the sealed vessel, and a compressor mechanism within the sealed vessel. The compressor mechanism includes a cylinder having a compression compartment defined therein and also having upper and lower openings, an eccentric cam provided on a crankshaft for rotation together therewith, and a ring-shaped piston mounted on the crankshaft while encircling the eccentric cam and capable of undergoing a planetary motion in contact with the eccentric cam during rotation of the eccentric cam. The cylinder has a refrigerant intake port defined therein in communication with the compression compartment.

Abstract: The invention concerns a reversible rotary compressor which can compress refrigerant in either of the forward and reverse directions, without providing a valve mechanism in a closed container. In a reversible rotary compressor including a cylinder, a rolling piston, and a slide vane, two inlet/outlet ports are formed in a space between the outer surface of the rolling piston and the inner surface of the cylinder in a state that the two inlet/outlet ports are disposed on both sides of the slide vane. The two inlet/outlet ports are closed by the rolling piston when the rolling piston is positioned at the top dead center and fully opened when the rolling piston is positioned at the bottom dead center. Two refrigerant pipes, coupled with the inlet/outlet ports, are provided in the side wall of the cylinder.

Abstract: A rotary compressor has a compression chamber defined by a rolling piston which is eccentrically rotated in a cylinder by a rotary shaft including an eccentric crank portion, and by a blade which slides in a groove formed in the cylinder and of which the tip contacts an outer-peripheral surface of the rolling piston.

Abstract: A lubricating device for a horizontal type hermetic compressor. The device includes an oil cylinder at the back of a spring-biased vane in a compressing cylinder, and also includes an oil piston and an oil valve in the oil cylinder. The oil piston communicates with the oil valve by the movement of the vane, thus to achieve the lubrication oil supply through the oil cylinder. The oil piston is biased by a compression coil spring positioned under the piston, so that it is easy to fabricate the compressor. Since the length of the oil piston is longer than the distance between the upper dead point of the oil pumping chamber and the vane slot reference hole, introduction of refrigerant into the oil cylinder is reliably prevented. This device uses a conventional horizontal type hermetic compressor with a slight change of its construction and easily precisely controls the flow rate of the lubrication oil to be delivered.

Abstract: A lubricating device for a horizontal type rotary compressor having an oil pumping chamber formed under the vane in the compression cylinder. The oil pumping chamber is provided in the compression cylinder under the vane and has an oil inlet port and an oil outlet port provided on at least one of its side walls. An oil piston is received in the pumping chamber such that it elastically vertically reciprocates in the pumping chamber in accordance with vertical reciprocation of the vane. The piston is biased upwards at the outside of the pumping chamber by a steel wire spring which is connected at one end thereof to the oil piston and at the other end thereof to one of the compression cylinder, the main bearing and the sub bearing. An oil feed pipe is connected between the oil outlet port of the pumping chamber and an oil conduit of the eccentric rotating shaft. A hydraulic diode, of which the upper diameter is not smaller than the lower diameter, may be axially formed in the oil piston.

Abstract: A hermetic compressor for compressing the refrigerant in such a refrigerating systems as in refrigerators, freezers, air conditioners and the like, has a sliding part slidably inserted in one end of a hollow shaft, the hollow shaft is adapted to have a tantgential contact with a pumping cylinder, wherein the rotation of the sliding part according to the rotation of the shaft while the sliding part maintains contact with inside of the pumping cylinder allows to draw in and push out oil inside of the cylinder through a lubrication oil guide, the hollow of the shaft and discharge holes on the shaft to feed to each lubrication parts.

Abstract: A rotary compressor including an orbiting piston is disposed within a cylinder bore. A crankshaft with an eccentric causes the piston to orbit within the cylinder block. Crescent shaped polymeric washers are interfit between the eccentric and cylinder bore endwalls to reduce friction and endplay therebetween. Curved or whorled grooves on the face of the washer reduce frictional contact area and at the same time increase lubricant flow. Compressor noise is reduced by the ability of the washers to act as resilient stops between the eccentric, crankshaft and cylinder endwalls.

Abstract: A rotary compressor including an orbiting piston is disposed within a cylinder bore. A drive shaft with an attached eccentric causes the piston to orbit within the cylinder block. Rotation of the piston is prevented by a pin radially disposed on the piston and slidably engaged through a recess in the cylinder bore. A plastic pinion is interfit about the radially outward end of the pin and disposed within the recess to prevent piston rotation and reduce re-expansion volume.

Abstract: The same number of grooves 20 through 27 are provided in end surfaces 19a and 19b of a roller 19. The grooves 20 through 27 have communicating portions 20a through 27a which communicate with an inner peripheral side of the roller 19 and sealed portions 20b, 20c, 20d, 20e, 20f through 27b, 27c, 27d, 27e and 27f each of whose cross-sectional area decreases. Accordingly, the cross-sectional area is decreased in direction in which a lubricating oil flows, and a plurality of oil pressures can thus be obtained. This results in a fixed clearance of roller 19.

Abstract: A plurality of vane chambers on the back side of vanes are caused to function as pump chambers using the reciprocating movement of the vanes to pressure-feed a lubricating oil to a compressor mechanism unit. A taper hole at one of the vane chambers for drawing the lubricating oil, a hole on another chamber for mitigating back pressure and a taper hole between the chambers are provided to improve the pressure feeding capability. In addition, the lubricating oil having been supplied to the compressor mechanism unit is supplied to the slide surfaces of crank portions from an oil hole of each crank portion through an oil passage at the center of the rotating shaft and is further distributed optimally to slide bearing portions by oil guide grooves.

Abstract: A discharge valve device of a rotary compressor comprises a discharge passage formed in the wall of a cylinder for connecting to a compression chamber, a discharge valve for blocking/opening the discharge passage depending upon the gas pressure in the chamber, and a spring for restricting the movement of the discharge valve. The discharge valve moves along a passage wall in contact therewith during travel between its blocking/opening positions.

Abstract: An orbiting rotary-type compressor including an orbiting cylindrical piston member, sealing members, cylinder housing, Oldham ring assembly and motor for permitting orbital movement. Sealing is achieved sliding vanes within slots in the cylinder housing which are sealingly biased toward orbiting piston member by means of springs. An axial compliance and a radial compliance mechanism promotes proper sealing.

Abstract: An object of this invention is to provide a compressor in which the number of components and the number of manufacturing steps are reduced, and a compression element is prevented from being displaced in the casing, whereby the air gap between the rotor and the stator of the motor is held unchanged at all times. In a compressor, a connecting cylinder 11a is formed on the casing 1 having a connecting opening 11 such that it is extended from the connecting opening outwardly of the casing, and an inlet tube 6 has a first press-fitting portion 61 which is press-fitted into a refrigerant suction opening 31a and a second press-fitting portion 62 which is press-fitted into the connecting cylinder 11a. The inlet tube 6 is fixedly secured to the casing 1 by press-fitting it into the refrigerant suction opening 31a and the connecting cylinder 11a, whereby the compression element 3 is prevented from being displaced in the casing.

Abstract: A rotary compressor comprises a body forming an even number of parallel cylinders arranged equidistantly about an axis within a common plane oriented perpendicularly to the axis. An eccentric roller is rotatably mounted in each cylinder for sucking-in fluid through a respective inflow port and, once having compressed the fluid, discharging the fluid through a discharge port. A vane is disposed in each cylinder and is spring-biased against a respective roller to isolate the inflow port from the discharge port. A motor-driven drive shaft rotates about the axis and is coupled to the rollers by means of gears.

Abstract: The crankcase or cylinder body of a rotary compressor is secured in a shell by a shrink fit thereby providing intimate contact over its entire circumference. To maintain the proper positioning of the crankcase during the shrink fitting process, the outer surface of the crankcase defines a portion of a sphere, specifically the equatorial portion. As a result the spherical surface provides a stable contact surface over a range of positions of the crankcase and the intimate contact changes the frequencies of response of the shell.

Abstract: The cylinder, having a central axis, has its bore for the rolling piston formed therein perpendicular to the axis. Too, the slot for the sliding vane is traverse the axis, and opens onto the piston bore. A channel formed through the cylinder, at one side of the slot, and another channel formed through the cylinder at the other side of the slot, provide for the admittance and discharge of intake gas and compressed, discharge gas, respectively. The compressor is built up from such a cylinder, with a piston-driving crankshaft, a biased, sliding vane, and bearing-supporting and lubrication-accommodating end cover assemblies.

Abstract: An adjustable eccentric mechanism for an orbiting rotary compressor comprising an eccentric, disposed within an orbiting roller, pivotally engaging a crankshaft and locking means for locking the eccentric to the crankshaft in a manner permitting adjustment of the eccentricity of the roller. A method of setting the eccentricity of an orbiting roller by swinging the roller around within the cylinder chamber into contact or a specified clearance with the sidewall, then locking the roller eccentric into place.

Abstract: A rotary compressor has an electric motor and a compressing mechanism drivingly connected together by a crank shaft and disposed in a closed housing. The compressing mechanism has a rolling piston rotatable in a cylinder bore and driven by an eccentric portion of the crank shaft. First, second and third balancers are mounted on an end of the crank shaft and on the opposite ends of a motor rotor, respectively. The second and third balancers are formed therein with weight-adjusting holes by which the masses of the second and third balancers are finely adjusted to fall within tolerable ranges.

Abstract: The invention refers to a hermetic compressor with rotary rolling piston, of the type of high internal pressure inside the shell (1) and small displacement volume, and with its cylindrical chamber, internal to the cylinder block (4), being internally divided by the rolling piston (50,500) and by a sliding vane (9), into suction and discharge chambers with internal pressure being considerably lower than the internal pressure of the shell during most of the rolling piston (50,500) operating cycles. An axial gap for the passage of lubricant oil is provided between the annular faces of the rolling piston (50,500) and the axial end walls (10a, 20a) of the cylindrical chamber. The rolling piston (50,500) presents an external diameter/internal diameter relation of about 1.63 up to 2.22, in order to increase the radial path of the lubricant oil through said axial gaps.

Abstract: A rolling piston compressor includes substantially cylindrical casing having a variable diameter inner circumferential surface. A radially extending vane recess is formed in the casing. A first lateral surface is defined as a portion of the inner circumferential surface disposed immediately laterally of the vane recess on a first side. A second lateral surface is defined as a portion of the inner circumferential surface disposed immediately laterally of the vane recess on a second side, the second side being opposite to the first side. The first and second lateral surfaces are radially offset relative to each other. A rolling piston is mounted for rotational travel about the inner circumferential surface. A longitudinal contact line is defined between the first and second lateral surfaces across the vane recess. An impact reducer limits the severity of impact between the rolling piston and the second lateral surface during travel of the piston along the contact line.

Abstract: The valve assembly for a rotary compressor includes an elongated valve member which rests on pads on each side of the valve seat and includes an intermediate sealing section normally sealing against the valve seat. An elongated valve spring biases the sealing section toward engagement with the valve seat. An elongated spring backer sits on one end of the valve spring and the other end of the valve member. One end of each of the valve member, valve spring and spring backer are bolted to the compressor end plate. The other end of the spring backer permits the corresponding end of the valve member to slide along the end plate as the valve member moves between its open and closed positions, while restraining the end of the valve member from moving away from the end plate. A backer support, positioned between the spring backer and the head of the bolt, spreads the clamping force and defines a line about which the valve member and valve spring flex.

Abstract: The rotary machine comprises a cylindrical chamber having a rolling piston rotating therein, the piston rolling against the inside surface of the chamber wall. In normal operation, springs keep a vane pressed against the periphery of the rolling piston. A control device for controlling the piston of the vane comprises a control rod lying in the same plane as the vane. The rod includes a retaining abutment formed at the bottom of the control rod and received in a housing formed inside the vane and including a top wall through which the control rod passes, the top wall co-operating with the abutment and the housing having a vertical extent which is not less than the maximum distance between the peripheral surface of the piston and the casing of the rotary machine, thereby enabling the vane to move freely relative to the abutment when the abutment is in its low position.

Abstract: A rotary compressor comprising a cylindrical chamber, a vane slidably mounted in the peripheral cylinder wall and a torsion spring to bias the vane into contact with an eccentrically mounted roller. The spring includes an elongated central portion and a pair of arms extending from the central portion in parallel planes. The arms are curved or radiused in opposite directions. The central portion is connected to the outer edge of the vane while the ends of the arms are connected to opposite side of the cylinder so that the arms exert a torsional force on the central portion.

Abstract: A sliding vane rotary pump which includes a housing having disposed therein a cylinder housing, a roller rotatable mounted in a cylindrical opening of the cylinder housing and bearing plates for closing bottom and top ends of the cylindrical opening. The roller includes a cylindrical tube having an internal space wherein each end of the cylindrical tube is provided with a counterbored surface. A seal ring is disposed within the counterbored surface of each end of the cylindrical tube a width of the seal ring extends over the internal space within the cylindrical tube. The internal space is filled with a pressurized fluid supplied by the compressor. The pressurized fluid in the internal space exerts a biasing force on the seal rings to thereby cause the seal rings to move outwardly from the ends of the roller to form a seal with the bearing plates.

Abstract: A rotary compressor has an electric motor and a compression mechanism drivingly connected thereto by a crank shaft including an eccentric portion having flangelike thrust bearing sections and an eccentric pin section on which a rolling piston is mounted for eccentric rotation in a cylinder bore. The eccentric pin section has formed therein at least one axial through-hole for reducing the mass unbalance of the pin section. The crank shaft has formed thereon coaxial sections each concentric to the axis of rotation of the crank shaft and disposed between the eccentric pin section and one of the thrust bearing sections to decrease the axial dimensions thereof and of the eccentric pin section for thereby decreasing the total mass unbalance of the eccentric portion of the crank shaft whereby crank shaft deflection due to mass unbalance is remarkably reduced particularly at a high speed operation.

Abstract: A horizontal rotary compressor comprises a sealed shell having a lubricating oil accumulated at a lower part therein; a drive unit included in the sealed shell; a compression unit included in the sealed shell and driven by the drive unit through a crankshaft; the crankshaft having a lubricating oil feeding hole formed therein; a lubricating oil pump for supplying the lubricating oil to the crankshaft to lubricate the compression unit; a discharge muffler which is arranged at the end of the compression unit remote from the drive unit, and which is provided with a lubricating oil passage; the lubricating oil passage having one end opened in the lubricating oil and the other end opened at the lubricating oil feeding hole; and a discharge refrigerant gas passage which is formed to be upwardly inclined in the discharge muffler so as to communicate from the space in the discharge muffler to the lubricating oil feeding passage.

Abstract: A rotary compressor has a plate-like hollow vane disposed in sliding contact with a rotary piston. The vane has an internal cavity formed by a plurality of bores each having a substantially rectangular cross-section. The corners of each bore are each formed by a curved concave surface of a radius of curvature which is greater than the thicknesses of the outer walls of the vane. The major side surfaces of the vane are in slidable contact with opposing walls of a vane slot and have surface layers each formed of an oxide film consisting mainly of tri-iron tetraoxide (Fe.sub.3 O.sub.4). The film is finished by smoothing processing, thus attaining a smaller friction between the vane major side surfaces and the vane slot walls and suppressing local wear of the vane slot walls.

Abstract: A rotary rolling piston compressor having a hermetic shell in which a cylinder is fixedly mounted. A rolling piston is driven by a crankshaft supported by a bearing pair and carried by the rotor of an electric motor whose stator is fixed internally to the shell. The cylinder has a radial slot in which a vane reciprocates. The vane defines compression and suction chambers, limited axially by the internal faces of the bearings and the chambers having discharge and suction orifices, respectively. The internal face of at least one of the bearings is provided with a groove with one end in communication with the compression chamber and the part on the suction chamber side of the vane in communication with a recess provided on the radial slot surface, on the suction chamber side. The recess extends transversely to the direction of the reciprocating displacement of the vane.

Abstract: A unitized structure of a main bearing and a cylinder of a rotary compressor is disclosed. The cylinder is formed integrally with and directly in the main bearing. Further, the inner circumferential corner of the cylinder is shaped in a round form, and the corresponding circumferential corner of the roller is shaped also in a round form. According to the present invention, the fastidious adjusting procedure required in assembling the conventional compressor and the drop of the effciency due to the variation of the clearance between the cylinder and the main bearing are all eliminated, thereby improving the productivity and the product quality.

Abstract: A compressor in which the portion of the suction tube within the housing is rectilinear with a constant diameter and has an internal or external insulating tube, the suction tube being arranged through a positioning socket which is attached to the front cover of the compressor housing and extends inside and outside the housing with the positioning socket outer end being welded around the suction tube at a point away from the housing front cover and from the insulating tube inlet end within the compressor housing.

Abstract: A crankshaft for a hermetic compressor of the type that comprises a piston which is displaced in the interior of a cylinder by action of an eccentric portion of the crankshaft which is rotatively driven by the electric motor of the compressor, so that the outer face of the eccentric portion facing the axial bearing is spaced according to a surface portion defining an inclined outer face portion which produces a hydrodynamic wedge at the crankshaft eccentric portion.

Abstract: A rotary compressor includes a cylinder having a cylindrical compressing chamber, an eccentrically movable rotor disposed in the compressing chamber, and a reciprocally movable blade disposed in a blade guide groove which extends from the compressing chamber in a radial direction. The blade is provided with a pair of projections respectively extending from the one end of the blade toward the bottom of the blade guide groove, and the other end of the blade contacts the peripheral surface of the rotor. A pair of depressions are respectively formed at the bottom of the blade guide groove for permitting the projection pairs of the blade to reciprocally move into the corresponding depressions, thereby increasing the contacting portion between the blade and the blade guide groove in comparison with a conventional rotary compressor when the blade moves into the compressing chamber at a prescribed length.

Abstract: A rotary rolling piston type compressor having a cylinder mounted in a hermetic shell and a rolling piston driven by a crankshaft carried by the rotor of an electric motor whose stator is fixed internally to the shell. An external part of the cylinder has a radial slot that houses a slidable vane which defines with the cylinder and the piston compression and a suction chamber. The vane surface facing the suction chamber has a planar surface on its upper portion parallel to the vane surface facing the compression chamber and the lower portion of the surface facing the suction chamber has a relieved, or chamfered, section(s). The chamfered surface(s) develops a hydrodynamic wedge effect upon the vane during downward displacement, increasing the lubricating and stability capacity of the vane against the wall of the slot in which the vane slides, and reduces the area of the vane which is in actual contact with the wall of the slot.