Abstract: An efficient scroll type compressor is disclosed which has a large number of spiral turns, yet yields gradual, controlled compression. The compressor includes a housing, a fixed scroll and an orbiting scroll. The fixed scroll is fixedly disposed relative to the housing and has a circular end plate from which a first spiral wrap extends. The orbiting scroll has a circular end plate from which a second spiral wrap extends. The spiral wraps interfit at an angular and a radial offset to make a plurality of line contacts to define at least one pair of sealed off fluid pockets. The fluid pockets move toward the center of the spiral wraps with consequent reduction of their volume by the orbital motion of the orbiting scroll. The spiral wrap of each scroll has a transition portion between a higher inner portion of the spiral, and a lower outer portion thereof. The circular end plate of each scroll is provided with a stepped portion between a deeper inner portion of the end plate and a shallower outer portion thereof.

Abstract: In a scroll type fluid compressor having an orbiting scroll member and a fixed scroll member which form at least one pair of outer fluid pockets and a central pocket therebetween for fluid compression, the axial end surfaces of each spiral element of the scroll members have a groove along the spiral curve. At least one closed portion is located along the groove to block fluid flow in the groove. A seal element is loosely fitted in the groove. During operation the compressed fluid flows into the groove to urge the seal element against the end plate of the opposite scroll member so that the axial sealing between the spiral element and the end plate is assured without leakage of fluid along the groove. Also, the closed portion is located along the spiral element at the location where the line contact point where the outer fluid pockets and the central pocket merge to prevent back pressure changes from causing excessive wear of the seal element.

Abstract: A fluid displacement apparatus, in particular, a compressor unit, is disclosed. The apparatus includes a housing having a front end plate member and a fixed member and an orbiting piston member. The members interfit to make a plurality of line contacts to define at least one pair of sealed off fluid pocket. A driving mechanism, including a drive shaft is disposed within the housing and is connected to the orbiting piston member to effect the orbital motion of the orbiting piston member by the rotation of the drive shaft. The front end plate member is comprised of a front end plate portion in which is formed an opening for passage of the drive shaft, and an annular sleeve portion extending from a front end surface of the front end plate portion for surrounding the drive shaft. The drive shaft is rotatably supported by two bearing means which are disposed within the front end plate member.

Abstract: A scroll-type fluid compressor unit including a housing having a fluid inlet port and fluid outlet port and a fixed an an orbiting scroll member within the housing. Each scroll member has an end plate and a spiral element which are maintained angularly and radially offset so that both spiral elements interfit with line contacts between the spiral curved surfaces to define moving sealed off pockets. A thrust supporting means is engaged with a side surface of a portion of the orbiting scroll member for providing axial thrust support. An axial pushing means such as a spring-biased rod is engaged with the orbiting scroll member for pushing the orbiting scroll member against the thrust supporting means from the side of the orbiting scroll member which faces the fixed scroll member, so that axial slant of the orbiting scroll member is minimized.

Abstract: A scroll-type fluid displacement apparatus, in particular, a compressor unit is disclosed. The unit includes a housing comprising of a cup shaped casing and a front end plate member. A fixed scroll member with a first end plate means and a first spiral element is fixedly disposed within the interior of the cup shaped casing by a plurality of screw members screwed from the outside of the cup shaped casing through a fixed member, such as a plurality of legs or annular projection, which is disposed between the end surface of the first end plate means and the inner surface of the cup shaped casing. A seal ring is disposed between an outer peripheral surface of the end plate and the inner surface of the casing. An inner chamber of the casing is thereby partitioned into two chambers by the end plate.

Abstract: A scroll-type of fluid displacement apparatus is disclosed. The apparatus includes a housing having a fluid inlet and a fluid outlet port. A fixed scroll member is fixedly disposed with respect to the housing and has an end surface from which a first wrap extends. An orbiting scroll member is movably disposed within the housing and has an end plate from which a second wrap extends. The first and second wraps interfit at an angular offset to make a plurality of line contacts which define at least one pair of sealed off fluid pockets. A drive mechanism is connected to the orbiting scroll member to transmit orbital motion thereto. A rotation preventing means prevents rotation of orbiting scroll member during orbital motion of the orbiting scroll member and is comprised of fixed ring and a sliding ring. The sliding ring is slidably connected to the fixed ring and also to the second end plate by keys and keyways.

Abstract: In a scroll type compressor unit including two interfitting fixed and orbiting scroll members in the compressor housing, a crank shaft projecting from the interior of the compressor housing and rotatably supported by a radial bearing, a crank pin on the inner end of the crank shaft on which the orbiting scroll member is rotatably supported by another radial bearing, and a rotation preventing mechanism for preventing the orbiting scroll member from rotating, an oil accumulating chamber is provided in the compressor housing to connect with the fluid inlet port of the compressor housing in order to lubricate those radial bearings and other moving parts. A shaft seal assembly is mounted on the crank shaft in a shaft seal cavity which is communicated with the oil accumulating chamber through a first oil passageway formed in the wall of the compressor housing.

Abstract: A scroll type compressor unit including a compressor housing having fluid inlet and outlet ports, and two fixed and orbiting scroll members within the compressor housing. Each scroll member has an end plate and a spiral element which are maintained angularly and radially offset so that both spiral elements interfit with a line contacts between the spiral curved surfaces to define moving sealed off pockets. In order that the fluid may be reliably taken into all fluid pockets, the end plate of the fixed scroll member is formed with a suction port connecting to the fluid inlet port at a position adjacent to the outer terminal end of the orbiting spiral element. Thus, the fluid introduced through the suction port may be taken into a fluid pocket which is formed at the outer terminal end portion of the orbiting spiral element and is sent along the outer surface of the orbiting spiral element to a fluid pocket which is formed at the outer terminal end of the fixed spiral element.

Abstract: A scroll-type refrigerant compressor unit is assembled by inserting parts into the compressor housing in a predetermined order and by finally securing a front end plate onto the compressor housing by bolts, which simplifies the production of the compressor unit. A drive shaft is supported by a single radial bearing, and a disk rotor having a drive pin to effect the orbital motion of the orbiting scroll member is fixedly mounted on the inner end of the drive shaft and is supported on the front end plate by a thrust bearing. Thus, the drive shaft and, therefore, the compressor unit are reduced in length and deflections and vibrations of the drive shaft are prevented. A lubricating system is provided to lubricate the shaft seal assembly on the drive shaft wherein the oil in the compressor housing is directed to the shaft seal cavity and returns to the interior of the compressor housing after lubricating the radial and thrust bearings and other parts.

Abstract: A scroll-type compressor unit including fixed and orbiting scroll members contained within a cylindrical housing. Each scroll member has an end plate and a spiral element.In order to reduce the radius of the cylindrical housing, the end plate of the orbiting scroll member is a circular plate having a radius of (a+R/2) at a minimum, and the center of the spiral element of the orbiting scroll member is offset from the center of the end plate by R/2 towards the terminal end of the spiral element, where the radius of the orbital motion of the orbiting scroll member is R, and the distance between the center and the terminal end of each spiral element is a. The fixed scroll member is disposed in the cylindrical housing so that the center of the cylindrical housing is offset from the center of the spiral element towards the terminal end of the spiral element thereof by R/2. In this arrangement, the inner radius of the cylindrical compressor housing is reduced to (a+3R/2) at a minimum.

Abstract: A scroll-type compressor unit which includes fixed and orbiting scroll members contained within a cylindrical housing. Each scroll member has an end plate and a spiral element.In order to reduce the radius of the cylindrical housing, the end plate of the orbiting scroll member is a circular plate having a radius of (a-R/2), and the center of the end plate of the orbiting scroll member is offset from the center of the spiral element affixed thereto, assuming that the radius of the orbital motion of the orbiting scroll member is R, and that the distance between the center and the terminal end of each spiral element is a.Furthermore, the fixed scroll member is so disposed in the cylindrical housing that the center of the spiral element thereof is offset from the center of the cylindrical housing towards the terminal end of the spiral element thereof by R/2. In this arrangement, the radius of the cylindrical compressor housing is further reduced.

Abstract: In a refrigerant compressor unit of a type in which the reciprocating movement of pistons is caused by the nutation of a non-rotatably but nutatably supported wobble plate driven by a cam rotor. The wobble plate includes a ring member and a bevel gear member. The bevel gear member is provided with a plurality of axial grooves in the peripheral side surface thereof. The gear member is fitted into a counterbore formed in the ring member and secured by caulking the peripheral edge of the counterbore to the ring member. The material of the ring member is moved into the grooves and valleys between the teeth of the gear by the caulking operation so that relative rotation and axial movement of the ring member and gear member is prevented. The wobble plate is supported on a ball bearing so as to be able to nutate about the ball center but is prevented from rotation by engagement of the bevel gear with another bevel gear fixedly supported on the cylinder block.

Abstract: A lubrication system for a compressor unit includes a deflector depending from the inner wall of the compressor housing for directing the oil on the inner wall through a passageway of the front housing into the shaft seal cavity. A flange member extends from the depended end of the deflector along the inner wall of the compressor housing to prevent the oil flow directed to the shaft seal cavity from leaking into the interior of the compressor housing. A balance hole that permits a blow-by refrigerant gas to flow from the crank chamber into the suction chamber is formed in the cylinder block near the center thereof so that oil in the crank chamber is prevented from flowing into the balance hole. The compressor may also include a wobble plate supported by a bearing ball. A seat of the bearing ball is provided with an oil passageway which communicates with a crank chamber so that the bearing ball is lubricated.

Abstract: A noiseless supporting mechanism of a wobble plate in a compressor unit of the wobble plate type comprises a support member having a spherical convex surface at its end. The support member is elastically supported on the cylinder block and is disposed in a hollow portion of the wobble plate with the spherical convex surface being in contact with a spherical concave bottom surface of the hollow portion, to support the wobble plate. A plurality of equiangularly-spaced projections are supported around the central axis of the supporting member and are disposed in corresponding recesses formed in an inner surface at an opening edge of the hollow portion to prevent the wobble plate from rotating. The wobble plate thus nutates along the spherical convex surface by the rotation of the associated cam rotor.

Abstract: A refrigerant compressor having pistons reciprocated in respective cylinder by a wobble plate driven by an input rotor which is secured on a drive shaft, which compressor has a reduced volume and an improved lubricant system. An end plate of a housing for the compressor supports and bears the drive shaft and is formed with an oil port extending from a shaft seal cavity mounting a shaft seal of the drive shaft to a gap between the end plate and the rotor, with the drive shaft being formed with another oil port extending the shaft seal cavity and a gap between the rotor and the wobble plate whereby the lubricant oil flows through the gap between the rotor and the wobble plate, the oil port in the drive shaft, the shaft seal cavity, the oil port in the end plate, and the gap between the rotor and the end plate in the order. The rotor is formed with an annular recess on a surface thereof facing the end plate and in eccentricity from the rotating axis of the rotor.