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: Draining lubricant tends to be slung off of radially extending surfaces of the rotating shaft and entrained by the suction gas. This is prevented by providing an oil shield which collects the slung oil and directs it downwardly out of the path of the flowing suction gas.

Abstract: A lubricating mechanism for a motor driven scroll apparatus has the compression and drive mechanisms within a hermetically sealed housing. The drive mechanism comprises a drive shaft having a pin member extending from an inner end thereof and a motor for rotating the drive shaft. The pin member is operatively connected to an orbiting scroll of the compression mechanism through a bushing. The drive shaft includes a first axial bore extending from an open end adjacent a fluid inlet port and terminating adjacent the inner end of the drive shaft. Radial bores are provided at the terminal end of the first axial bore. A second axial bore extends from the terminal end of the drive shaft. The longitudinal axis of the first axial bore is substantially aligned with the second axial bore. The bushing includes a passage extending substantially straight therethrough and substantially aligned with the open end of the second axial bore.

Abstract: A high side co-rotating refrigerant scroll compressor includes a motor disposed vertically above its compression mechanism. The discharge of gas from the compression mechanism is through the drive shaft of the drive scroll member which is rotatably supported at its distal end in an upper bearing. Upper bearing lubrication is accomplished by the disentrainment of oil from the mixture of compressed refrigerant gas and oil discharged from the compression mechanism in the vicinity of the bearing and by the direction of such disentrained oil to the bearing.

Abstract: To reduce a load applied to the thrust bearing, to prevent the thrust bearing from seizing and to improve the service life of the thrust bearing, the thrust bearing is provided between a drive shaft and a block to seal a high-pressure side space from a low-pressure side space. By providing an oil supply through hole, one end of which opens into high-pressure side space and the other end of which opens into a space formed by inserting the shaft into the insertion hole, high-pressure lubricating oil can be supplied to the space. The constric within the shaft with the effect of the constriction clearance is formed between the aforementioned oscillating shaft and the insertion hole, and a pressure differential between the two ends of the drive shaft is eliminated.

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 positive-displacement machine for compressible media has a positive displacement body that is retained on a disk-like rotor, which is eccentrically drivable relative to the housing, in such a manner that each of its points executes a circular motion during operation. To that end, an eccentric disk is disposed on a drive shaft, and the rotor is supported on this disk by means of an oil-lubricated bearing. The lubricating oil is delivered and removed to and from the side remote from the drive side of the drive shaft, and the separation of the oil inflow from the oil return flow is effected in the housing by a slide bearing which has one oil chamber each on both ends. The separation of the oil streams is effected by an indentation that does not extend over the entire length of the slide bearing. Through this indentation, the slide bearing is likewise supplied with oil. The indentation connects the oil inflow bore in the housing with the oil chamber.

Abstract: A lubrication system for a scroll machine which, to any extent desired, can utilize the centrifugal forces generated by the orbiting of the orbiting scroll member to influence, either positively or negatively, the flow of fluid in a portion of the lubricant system. This fluid can be either a lubricating oil fed to the thrust bearing for normal lubrication, an oil injection into the intermeshed scrolls to increase sealing and efficiency while attenuating noise, or a venting of vapor from some point in the lubrication system.

Abstract: A scroll compressor oil circulation system has the usual concentric bore oil pump which supplies lubricating oil to a chamber within which an impeller rotates. The rotating of the impeller within this chamber pumps lubricating oil through a passage which communicates with a control passage which injects a quantity of lubricant into the compression chambers of the scrolls for cooling and lubrication. The amount of oil injected into the compression chamber is controlled by the shape of the control passage through the orbiting scroll.

Abstract: The present invention relates to a horizontal hermetic compressor comprising an oil reservoir 9 which is installed in a closed housing to store the lubricating oil discharged from an oil pump 51, and an oil supply pipe which connects an oil supply hole 52 to the oil reservoir 9. The opening of an oil suction pipe 56 of the oil pump 51 is positioned below the upper limit oil level height H.sub.1 of the lubricating oil 57 stored at the inner bottom of the closed housing 8.

Abstract: There is provided a fluid compressor having a horizontal rotation axis. An oil reservoir for a lubrication oil is provided within a sealed casing. A cylinder having both end opening portions rotatably supported by bearings is housed within the casing. A rotor piston is eccentrically supported within the cylinder. A helical blade is wound around the outer periphery of the piston such that it can project from and retreat in the outer periphery of the piston. The cylinder and the piston are coupled by an Oldham mechanism. A gas is taken in a compression chamber defined by the cylinder, piston and blade, and it is compressed. The compressor is provided with a pump member, e.g. a trochoid pump, actuated by the rotation of the piston. The lubrication oil is sucked from the oil reservoir and supplied to slide portions.

Abstract: A scroll compressor has a fluid brake for resisting and impeding objectionable reverse movement of the orbiting scroll member. The brake includes a one-way clutch interconnecting a drive shaft and a paddle disposed in the compressor oil sump, and optionally a rotor shield for controlling oil flow around the lower end of the motor rotor. A two piece paddle has a rotatable paddle having blades to impart angular momentum to the lubricating oil and a stationary housing having vanes to resist the angular momentum imparted to the lubricating oil by the blades of the rotatable housing.

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: The scroll compressor 10 includes a housing 12. A fixed scroll 18, with an end plate 20, a spiral wrap 22 and a discharge aperture 90, is an integral part of the rear section 16 of the housing. An orbital scroll 24, including an end plate 26 and a spiral wrap 28, cooperates with the fixed scroll 18 to form sealed fluid pockets 38 and 40. An axial thrust and rotation prevention assembly 46 allows orbital motion, prevents rotation of the orbital scroll 24 and limits axial movement of the orbital scroll 24 away from the fixed scroll 18. The orbital scroll 24 is driven to move the fluid pockets 38 and 40 toward the center of the scrolls, and compress fluid in the pockets. The drive for the orbital scroll 24 includes a crankshaft 74 with a crank pin 78 journaled in the housing 12. An eccentric bushing 80 is journaled by a bearing 81 in a boss 82 on the orbital scroll 24. The crank pin 78 passes through a bore 87 in the eccentric bushing 80 to rotate the bushing.

Abstract: A scroll machine has a drive that incorporates radial compliance. The radial compliance is achieved by having the crank pin drive a drive bushing via a flat surface on the crank pin which slidably engages a flat bearing insert disposed in the wall of a bore located in the drive bushing. The bore in the drive bushing is slightly oval in cross-sectional shape to permit relative sliding movement between the crank pin and the drive bushing.

Abstract: In a compressor where an oil pump is driven by a crankshaft through a drive tang with oil passing through the drive tang. The bolts holding the drive tang in place tend to agitate the oil and create foam. To prevent foam from being drawn into the oil pump, the agitation is isolated by a sub-chamber defined in part by a spring retainer while oil is supplied via a tube extending through the sub-chamber.

Abstract: A melt pump comprises a pump housing having an intake port and a discharge port and a pair of gear rotors. Each of the pair of gear rotors having a gear part and a shaft part integrated with each other, which are arranged within the pump housing in such a manner as to be rotatable in mutually meshing condition. The melt pump further comprises a recovering passage for guiding resin leaking through a clearance between the pump housing and each of the pair of gear rotors into the intake port, a cooling hole drilled inside each of the gear rotors while facing to each clearance forming region; and a pipe inserted into the cooling hole for supplying cooling liquid. A sleeve for lining the internal periphery of the cooling hole is located in the hole so as to utilize the inside of the sleeve as a cooling liquid passage.

Abstract: An intake manifold (18) of an engine (10) includes a Roots-type supercharger (26) having rotors (28,29) driven by timing gears (72,74) disposed in a gear chamber (62) having a self contained oil supply and vent 98. The vent is formed in an input drive shaft (52) of the supercharger. The vent embodiments of FIGS. 2-4 include a radially extending passage opening into gear chamber (62) and effective to sling oil mist back into the gear chamber.

Abstract: A closed type scroll compressor has a drive shaft supported by a frame through bearings lubricated with a lubricating oil supplied from an oil reservoir via a lubricating oil passage bore formed in the drive shaft. The end of the drive shaft in which the upstream end of the lubricating oil passage bore opens is connected to the oil reservoir through a joint tube which is supported by supporting structures including a combination of a spherical slide bearing and slide bearing and capable of taking up any mounting error or displacement of the drive shaft in any direction. The compressor can be assembled easily without any risk of uneven or local contact of each sliding portion.

Abstract: A scroll compressor includes a discharge oil reservoir chamber that is subjected to a discharge pressure, a bearing oil supply passage for supplying and returning the lubricating oil to the main bearing and a revolving bearing by a viscosity pump; and an oil injection passage having a throttle passage which supplies part of the lubricating oil supplied to at least one of the bearings to compression chambers, thereby lubricating the bearing sliding surfaces supporting most of the compression load so as to reduce wear and frictional resistance.

Abstract: A scroll type compressor comprising a housing inside which a stationary scroll member and a frame are fixed to define a space therebetween large enough to receive therein an orbiting scroll member which inter-engages with the stationary scroll member to define therebetween a hermetical compression pocket into which the fluid to be compressed fills. An Oldham-coupling ring restricts the orbiting scroll member to orbit around the center of the stationary scroll wrap only. A back pressure chamber is in pressure connection with the compressed fluid through a lubricant for the compressor and also in fluid connection with an inlet of the fluid to be compressed through a capillary-like passage.

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 compressor oiling system for a horizontal rotary compressor including a pressure plate defining a motor chamber and compressor unit chamber within the compressor each having an oil sump. An opening in the pressure plate allows oil pressurized by discharge pressure from the compressor to pass through an oil pickup passageway leading from the sump portion of the compressor unit chamber to the outboard bearing of the actual compressor unit. During compressor operation, discharge gases create a pressure differential across the pressure plate allowing the oil level to raise within the compressor unit chamber to the level of the crankshaft thereby lubricating the crankshaft bearings.

Abstract: In a horizontal rotary compressor the gas path from the muffler is between the rotor and stator whereupon the flow direction is changed 180.degree. and the flow takes place between the stator and the upper shell. Oil drainage to the sump is in a flow path between the stator and the lower shell. The gas and oil paths serve to cool the rotor and the stator windings. Also, the gas flow reduces oil circulation from the compressor.

Abstract: A scroll compressor includes a stationary scroll and a rotary scroll rotated by a motor-driven crankshaft. The crankshaft has parallel passages therein which communicate at their lower ends with a pool of lubricating oil. A first of the passages coincides generally with the axis of rotation of the crankshaft at an inclination thereto, and a second of the passages is eccentrically offset. The crankshaft drives a pump which creates a suction in the passages to conduct oil from the pool to the scrolls. A control member is connected to the crankshaft for rotation therewith and is responsive to centrifugal force for gradually closing the second passage as the crankshaft speed exceeds a predetermined value. The amount of oil which is conducted is thus proportional to the crankshaft speed.

Abstract: Bearing lubrication in a scroll compressor can be reliably effected at a sufficient flow rate independently of the flow rate of the lubricating oil supplied to the compression chambers 14 through the provision of a rotary-type displacement oil pump having a pump ring 25 which is adapted to orbit by the movement of the orbiting drive shaft 16. In addition, a lubricating oil sump and an oil intake passage communicating therewith are provided in close vicinity to the compression mechanism 2, thereby making it possible to operate the compressor without involving any backward flow of refrigerant gas in the oil feeding passage over a wide range of operating speed.

Abstract: A rotary Wankel type engine system is disclosed, wherein the crankshaft is supported by a center main roller bearing. The rotor apexes are sealed by two piece apex seals and by side seals. The engine system further includes an oiling system which permits oil flow through the center bearing and through lubrication passages in the engine rotor to provide a means for cooling the engine rotor under high loading conditions. Riblets are defined in the combustion face of the rotor to promote aerodynamic lateral stratified charge control to minimize atomized fuel charge loss to surface wetting before ignition.

Abstract: A rotary piston internal combustion engine of trochoidal type of construction with a piston slidably journalled and controlled via a synchronous transmission gear drive unit. An eccentric bearing of the piston is sealed-off on both sides of the remaining machine chambers or spaces with sealing rings located around the eccentric shaft. Circulation of the lubricating oil and cooling oil that is under pressure being delimited as to this bearing and the cooling hollow chambers of the piston with such lubricating oil and cooling oil being kept away from the working chambers and also eliminating any oil inner seals otherwise required therewith.

Abstract: There is disclosed a scroll-type machine particularly suited for use as a refrigerant compressor and incorporating an improved lubrication system for the drive.

Abstract: Lubricating apparatus of a scroll-type compressor comprising a thrust bearing surface provided on a main frame, the surface including a lubricating groove thereon, an orbiting scroll performing an orbital motion under the condition of slide contacting at a lower surface thereof with the thrust bearing surface, a crankshaft having an axial lubricating passage, and lubricating passage included in the orbiting scroll and communicating with the axial lubricating passage of the crankshaft. The lubricating passage comprises a horizontal passage being radially formed as outwardly extending from the inner center of the orbiting scroll and including a stop pin which is inserted into the outer end of the horizontal passage, and also a lower vertical passage being vertically formed as extending from the horizontal passage in order to communicate with the lubricating groove of the main frame.

Abstract: An improved lubrication system for a refrigeration compressor is disclosed which lubrication system incorporates filtering arrangement for filtering lubricant supplied to a two stage lubricant pump and unique venting arrangement for venting gaseous refrigerant entrained within the lubricant. The two stage pump incorporates a vent passage in the first stage portion thereof which aids in avoiding a possible interruption of lubricant flow due to gaseous refrigerant within the first stage. A second radially extending restricted vent passage is provided in the drive shaft intermediate the ends thereof which is also designed to vent gaseous refrigerant while resisting the flow of lubricant therethrough so as to avoid priming thereof which could enable the passage to begin pumping lubricant.

Abstract: In a rotary vane hermetic compressor an improved loading structure is provided for the vanes. A pressure reducing means incorporated into the compressor rotor reduces the frictional loading of the vane tips against the compressor walls. A passageway vents fluid at suction pressure into a cavity in the rotor containing the inner tips of the sliding vanes.

Abstract: In a fluid compressor, a cylinder is arranged within a sealed casing. A piston having a spiral groove is placed within the cylinder. The piston is made eccentric to the cylinder such that part of the piston is put in contact with the inner peripheral surface of the cylinder. The piston and the cylinder are rotated relative to each other. A spiral blade is fitted in the spiral groove. The blade is put in contact with the inner peripheral surface of the cylinder, and forming a plurality of working chambers. The blade freely projects from and retreats in the groove. A fluid to be compressed is sucked in the working chambers. The compressed fluid is discharged from a discharge hole portion into the sealed casing. A support mechanism supports the cylinder and one of bearing members for supporting shaft portions of the piston. The support mechanism receives the lubricating oil mixed in the high-pressure compressed fluid discharged from the discharge hole portion.

Abstract: A triangle rotation engine, which comprises an oval rotor repeatedly performing Auto cycle inside a cylinder block, which defines therein three cylinder walls, for driving a crank shaft slidably linked with the oval rotor for an output of power through two axles and two fanshaped wheels pivotally connected with the crank shaft so as to achieve the performance of an internal combustion engine.

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 scroll compressor apparatus comprising a closed scroll compressor, an oil reservoir vessel separate from the closed scroll compressor, a discharge pipe, and an oil supply pipe. The closed scroll compressor includes a closed container having a suction port through which a compression medium is suctioned, a scroll compression mechanism encased in the closed container, a motor encased in the closed container, a first oil supply passage extending through an end plate of a fixed scroll and through which a first opening facing a sliding contact portion with an orbiting scroll is communicated with an oil supply port, a second oil supply passage formed in an end plate of the orbiting scroll and through which the first opening is communicated with a second opening facing an end face of a driving shaft, and a third oil supply passage, formed in the driving shaft, through which the second opening is communicated with the third opening facing a bearing supporting the driving shaft.

Abstract: In a co-rotational scroll apparatus having two interleaving scroll wraps secured to end plates rotating about parallel, non-concentric axes to produce a relative orbital motion, a means for providing positive lubricant flow through the scroll wraps. A sump is provided adjacent the idler scroll member for supplying lubricant to a lubricant pump disposed in the lower end of the shaft of one scroll member. A lubricant gallery is provided in the scroll shaft for receiving the lubricant from the pump and directing the lubricant through passages in the scroll shaft to lubricate the scroll shaft bearing and for directing lubricant to passages in the end plate of the scroll member to be discharged adjacent the outer ends of the scroll wraps into the alternatively open and closed first chamber formed by the scroll wraps.

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 gas removable pump for liquid comprising a housing having an inlet for introducing the liquid thereinto and an outlet for feeding the liquid therefrom, a drive shaft extending into the housing and a rotary pump disposed within the housing, the rotary pump including a rotor secured to the drive shaft for co-rotation therewith and a plurality of cells for feeding the liquid, each cell constituting a separator for gas-rich liquid upon rotation of the rotor. An ejector is provided for ejecting the gas-rich liquid separated in each cell through a passage formed in the drive shaft and the rotor. Also provided is a valve in the passage for opening and closing the same, the valve being arranged to operate in response to a pressure in the cell. The gas rich liquid gathers at inner portion of the cell due to a centrifugal force and is discharged by means of the ejector through the passage when the valve is in an open position.

Abstract: In order to continuously supply lubricant to compressor bearings independent of attitude, and under varying gravitational forces, an oil supply system (10) includes an oil sump (14), a pump (22), and a suction tube (24). The oil sump (14) is defined at least in part by a pair of intersecting sump walls (16, 18) each of which may comprise a primary wall dependent upon instantaneous compressor attitude. The pump (22) is adapted to supply the compressor with oil (20) while at the same time removing gases from the oil (20) and expelling the removed gases into the oil sump (14). Additionally, the suction tube extends from the pump to a strategic point within the oil sump (14) for drawing oil (20) from the oil sump (14) to the pump (22) in a manner assisting in priming and repriming during brief interruptions in the flow of oil (20) from the oil sump (14).

Abstract: A rotary compressor has a compression mechanism including main and sub bearings closing the ends of a cylinder bore and supporting a crankshaft having an eccentric portion on which a rolling piston positioned in the cylinder bore is rotatably mounted. Oil grooves are formed in the shaft holes of the bearings to receive lubrication oil from spaces defined by the rolling piston, the crankshaft eccentric portion and the main and sub bearings. The eccentric portion and the sub bearing are sized and shaped such that the oil groove in the sub bearing is always prevented from opening to the space adjacent thereto. The drawing force generated in the oil groove in the sub bearing by the rotation of a balancer attached to the lower end of the crankshaft is thereby prevented from acting on the space, thereby avoiding cavitation abrasion of the members facing the spaces.

Abstract: A crankshaft having a main bearing portion, formed by metal forging, casting or powdered metallurgy, and having coupled thereto a rotor stub portion comprising a steel tube fixedly secured to the main bearing portion, such as by press fitting, friction or laser welding. The rotor stub portion of the crankshaft is formed with suitable oil hole passages to deliver oil through the rotor stub portion to any desired location along this portion of the crankshaft.

Abstract: A displacement machine for compressing fluids includes a housing, a rotor in the housing and a drive shaft journalled in the housing and eccentrically mounting the rotor. A guide shaft journalled in the housing by a slide bearing guides the oscillation of the rotor. Intermeshing spiral strips on the rotor and housing produce compression of fluid in working chambers during oscillation of the rotor. In order to lubricate the drive and guide shafts, a lubricating system includes a bore supplying lubricant to the slide bearing, lubricant passages in the drive shaft and an intermediate line connecting the lubricant outlets from the slide bearing to the lubricant passages in the drive shaft. The guide shaft may be hollow to provide a bore therein which also communicates with the lubricant outlets from the slide bearing and supplies lubricant to an eccentric of the guide shaft.

Abstract: A scroll compressor comprises an orbiting scroll and a fixed scroll, each of which has a wrap formed on an end plate in upstanding position. These orbiting and fixed scrolls are assembled together with the wraps facing inwardly to each other so as to define a plurality of spaces by the wraps and the end plates of both scrolls. These spaces move toward the center of both scrolls during the orbiting movement of the orbiting scroll so as to reduce the respective capacities of the spaces. Thus, compression of a fluid is carried out. This compressor also includes a motor for driving the orbiting scroll and a driving shaft for connecting the orbiting scroll and the motor. At the end of the driving shaft on the motor side, a first oil supply pump is provided with its suction port communicating to an oil sump of the compressor.

Abstract: A hermetic scroll compressor is disclosed including within a hermetically sealed housing a fixed scroll member, an orbiting scroll member, and a crankshaft operably coupled to the orbiting scroll member and driven by a motor. The crankshaft has an axial passageway therein that is in fluid communication with an oil sump located in a discharged pressure chamber within the housing. Upon rotation of the crankshaft, a centrifugal oil pump delivers oil through the axial passageway to the bottom surface of a plate portion of the orbiting scroll member. An oil passage extends through the orbiting scroll plate to introduce oil into a discharge compression chamber established by the intermeshing fixed and orbiting scroll members. Accordingly, oil is introduced into the compression chamber and intermediate the scroll members without the creation of an intentional pressure leak. The size of the oil passage can be varied to affect the amount of oil introduced into the compression chamber.

Abstract: A rotary piston internal combustion engine of trochoidal type of construction with dual-arc or curved mantle runway or inner surface and at least one triangular piston having corners thereof in continuous sliding engagement with the inner runway or surface, such piston being journalled by roller bearings and regulated or controlled by a synchronization gear transmission. An oil-collector groove, channel or trough is provided on the shaft on a side remote from the or synchronization gear transmission. Bores in the eccentric lead from the oil-collector groove, channel or trough to the bearing of the piston and the smallest or most nominal oil quantities or volume for lubrication of such bearings, for lubrication of the synchronization gear transmission as well as the sealing parts of the piston, are provided extending in the eccentric.

Abstract: A two-cylinder type rotary compressor with a more durable bearing portion and a higher operational efficiency is provided. In addition, the two-cylinder type rotary compressor significantly reduces vibration and noise generated therefrom.

Abstract: A hermetic scroll compressor is disclosed including within a hermetically sealed housing a fixed scroll member, an orbiting scroll member, and rotatable crankshaft operably coupled to the orbiting scroll member by an eccentric crank mechanism. The crank mechanism includes an eccentric crankpin on the end of the crankshaft, a cylindrical roller having an off-center bore in which the crankpin is received, and a cylindrical well formed on the bottom of the orbiting scroll member into which the roller and crankpin assembly are received. An axial oil passageway in the crankshaft delivers oil from an oil sump directly to the interfaces between bearing surfaces of the crankpin, roller, and orbiting scroll member by means of radial oil passages in both the crankpin and roller. The radial passages are located at a central location along the axial length of the interfaces, and are either in line at the interface between the crankpin and roller, or are staggered 180 degrees.

Abstract: A compressor unit composed of a fixed scroll and an orbiting scroll which are engaged with each other, and a variable speed motor are disposed in a hermetic chamber. A first bearing is provided in an engagement portion between a crankshaft and the orbiting scroll in an intermediate pressure chamber provided on a back surface of the orbiting scroll for applying thereto an intermediate pressure between a discharge pressure and a suction pressure. The crankshaft is supported by a second bearing provided close to the orbiting scroll and a third bearing provided close to the motor. The first, second and third bearings are lubricated by force of a differential pressure between the discharge pressure and the intermediate pressure through an oil passage. The oil passage is in communication at one end thereof with the lubricant oil on which the discharge pressure is applied, and opens at the other end thereof into the intermediate pressure chamber.