Abstract: A scroll type fluid displacement apparatus is disclosed in which a pair of scrolls interfit at an angular and radial offset, each scroll including a circular end plate and a spiral element. The axial end surface of each spiral element has a groove along its spiral curve and a seal element is fitted in the groove to seal off fluid pockets. A plurality of projections are formed in the bottom surface of the groove at a predetermined spacing. Then, when the scrolls are assembled in their interfitting positions, the seal element is partly compressed and deformed by the projections and the opposing circular end plate so that the seal element maintains contact with the facing end plate of the opposing scroll without the use of any axial force urging device.

Abstract: A scroll type fluid displacement apparatus includes a pair of scrolls each having a circular end plate from which a spiral element extends. Both spiral elements interfit at an angular and radial offset to make a plurality of line contacts to define at least one pair of sealed off fluid pockets. One scroll, the orbiting scroll, is operatively connected to a driving mechanism and a rotation preventing mechanism, such as a ball coupling device, to effect orbital motion thereof. As the orbiting scroll orbits, the sealed off fluid pockets move along the shifting line contacts of the spiral elements to change the volume of the fluid pockets. According to the present invention, the number of turns of the orbiting and fixed spiral elements are different so that these spiral elements are of different length. As a result, the gas pressure distribution within the fluid pockets is asymmetrical which results in a larger moment of rotation for the orbiting scroll.

Abstract: The invention relates to scroll type fluid compressor which includes a mechanism for adjusting axial clearance and alignment. Adjustment sleeves, which are disposed threaded apertures of the compressor housing, move for and aft, and adjust the location and alignment of the scrolls. A threaded member passes through the sleeve to engage a threaded aperture on the end plate of the fixed scroll to thus fix the fixed scroll within the housing.

Abstract: A refrigerant compressor for automobile air-conditioning system is disclosed. The compressor comprises a front end plate member and a cylindrical casing attached to an end surface of the front end plate member. A polygonal shaped portion is formed on the outer peripheral surface of the front end plate member and a plurality of projections are formed on an opposite end of the housing from the polygonal shaped portion. The end surfaces of the projections are aligned on the same plane with each end surface of polygonal shaped portion. The end surfaces of the projections and the polygonal shaped portion have tapped holes for attaching mounting brackets. Therefore, a variety of suitable mounting arrangements can be used to mount the compressor and the mounting angle of the compressor can be adjusted.

Abstract: A scroll type fluid displacement apparatus is disclosed. The scroll type fluid displacement apparatus includes a housing, a fixed scroll and an orbiting scroll both of which having an end plate from which wrap extends. Both wraps interfit to make a plurality of line contacts to define at least one sealed off fluid pocket. A drive shaft is rotatably supported by the housing, and has a drive pin which is radially offset from the axis of the drive shaft. The end plate of orbiting scroll has a boss, and a bushing is rotatably supported within the boss. The bushing has an eccentric hole disposed eccentrically with respect to the center of the bushing, and the drive pin is inserted in the eccentric hole. The bushing also has a balanceweight which causes a centrifugal force which is slightly larger than the centrifugal force which arises by orbital motion of the orbiting scroll and other orbital parts to improve the wearing of the wrap in the high speed operation of the apparatus.

Abstract: A scroll type compressor is disclosed having a pair of scroll members which interfit with one another at an angular and a radial offset to define at least one pair of sealed-off fluid pockets of which the volume changes due to the relative orbital motion of the scroll members. The base or proximal portion of the inner end of each spiral wrap of the scroll members has an extension which increases the cross-sectional area of the base portion as compared to the upper or distal portion of the inner end. Therefore, the strength and rigidity of the inner end of each wrap, which is exposed to high temperature and high pressure is increased and the endurance of the compressor is significantly improved.

Abstract: A rotation preventing/thrust bearing device for use in an orbiting piston type fluid displacement apparatus is disclosed. The rotation preventing/thrust bearing device includes a fixed portion, an orbital portion and bearing elements. The bearing elements are cylinder shaped and placed between facing pairs of pockets formed in the fixed and orbital portion. The bearing elements are axially slidable in the pockets. The outer peripheral surface of the bearing elements contacts the opposing inner walls of the pockets, whereby rotation of the orbiting piston is prevented and the axial thrust load from the orbiting piston is carried through cylindrical shaped elements.

Abstract: A method and apparatus for adjusting the angular relationship between the scroll elements of a scroll type fluid displacement apparatus are disclosed. Holes are provided in the front end plate of the apparatus housing and the end plate of the orbiting scroll member. An adjusting member is inserted through these holes and is received in a bore provided in the fixed scroll member. The front end plate then is rotated in the reverse direction (opposite the drive direction) of the apparatus until its movement is stopped. The apparatus drive shaft then is rotated in the drive direction in order to establish the proper angular relationship between the scroll members. While the drive shaft is being rotated, the front end plate is secured to the housing in order to maintain the desired angular relationship.

Abstract: A scroll-type fluid displacement apparatus is disclosed having an adjustment mechanism for adjusting the axial clearance between the spiral elements and end plates of the fixed end orbiting scrolls. The axial position of the fixed scroll within the casing of the apparatus--and, therefore, the axial clearance between scrolls--is adjustable by means of a locating mechanism, such as an adjusting screw threadably engaged with the end plate of the casing and in contact with the end plate of the fixed scroll. The fixed scroll is stabilized within the casing to maintain parallelism of the scroll end plates by mating, relatively axially slidable guide projections on the end plate of the fixed scroll and the end plate of the casing.

Abstract: A scroll-type fluid displacement apparatus and a method of assembling the apparatus wherein an adjustment member provides proper alignment of parts. The apparatus includes a front end plate and a casing through which a hole extends, a bore formed in the end plate of an orbiting scroll, and a hole formed in a fixed scroll. The front end plate is fixed on the casing and the adjustment member is inserted through the hole and extends into the hole of the fixed scroll and the bore of the orbiting scroll. Then, the front end plate is rotated toward the driving direction until further movement is prevented. The front end plate is then tightly secured on the casing, thus adjusting the angular relationship between both scrolls.

Abstract: A scroll type compressor has interfitting spiral elements with thickened inner end portions which are stronger than the inner end portions of conventional spirals, and minimize the re-expansion volume of the working fluid. The inner end portions are comprised of arcuate surfaces which deviate from the involute curves of the remainder of the spiral elements.

Abstract: A rotation-preventing/thrust-bearing device for use in an orbiting-member fluid displacement apparatus is disclosed. The rotation-preventing/thrust-bearing device includes a discrete fixed portion, a discrete orbital portion and bearing elements. The fixed portion includes a fixed race and ring placed in a groove in an inner surface of the housing. The fixed race and ring are attached to the housing by pins, and the inner peripheral edge of the groove is caulked to the fixed ring. The orbital portion includes an orbital race and ring placed in a groove in an end plate of the orbiting member. The orbital race and ring are attached to the end plate of the orbiting member by pins, and the outer peripheral edge of the groove in the end plate is caulked to the orbital ring. A plurality of pockets are formed axially in the rings toward the respective races. The pockets of the rings face one another in generally aligned pairs.

Abstract: A lubricating system for a scroll type compressor which includes a housing having a front end plate and a cup-shaped casing. A fluid inlet port is formed on the cup-shaped casing positioned opposite and opening onto a rotation preventing/thrust bearing device. In one embodiment, a cut portion may be formed in the fixed ring of the rotation preventing/thrust bearing device opposite the fluid inlet port. An oil passageway may then be formed in the front end plate to communicate between the cut portion and a shaft seal cavity.

Abstract: A fluid displacement apparatus is disclosed which includes a housing having a front end plate, a fixed fluid displacement member and an orbiting fluid displacement member. The fixed and orbiting members interfit to make a plurality of line contacts to define sealed off fluid pockets. A driving mechanism, including a drive shaft, is disposed within the housing and is connected to the orbiting member to effect orbital motion of the orbiting member upon rotation of the drive shaft. The drive shaft is rotatably supported by the front end plate through an angular bearing disposed within the front end plate. The pressure cone apex of the angular bearing coincides with the driving point of the orbiting member. A thrust race is disposed on one axial end surface of the angular bearing, and a ring plate is disposed within the front end plate facing the thrust race at a predetermined axial distance.

Abstract: A scroll type compressor is disclosed. The compressor includes a housing having a fluid inlet port and an outlet port. A fixed scroll is fixed within the housing and has a circular end plate from which a first wrap extends. The end plate of the fixed scroll partitions the inner chamber of the housing into a front chamber connected to the fluid inlet port and a rear chamber. The rear chamber is divided into a central chamber connected to the fluid outlet port and an outer chamber. An orbiting scroll, which is disposed in the front chamber, also has a circular end plate from which a second wrap extends. Both wraps interfit at angular and radial offsets to form a plurality of line contacts to define at least one pair of sealed off fluid pockets. The end plate of the fixed scroll has at least two holes which are placed at symmetrical position and connect the fluid pockets to the outer chamber. The end plate also has a communicating hole which connects the first chamber and the outer chamber.

Abstract: A rotation preventing/thrust bearing device for use in an orbiting member fluid displacement apparatus is disclosed. The rotation preventing/thrust bearing device includes a discrete fixed portion, a discrete orbital portion and bearing elements. The fixed portion includes a fixed race and fixed ring both of which are formed separately. The fixed race is placed in a groove in an inner surface of the housing and the fixed ring is attached to the housing. The orbital portion includes an orbital race and an orbital ring both of which are formed separately. The orbital race is placed in a groove in an end plate of the orbiting member and the orbital ring is attached to the end plate of the orbiting member. A plurality of pockets are formed axially in the rings toward the respective races. The pockets of the rings face one another in generally aligned pairs.

Abstract: A scroll type fluid displacement apparatus including a housing, a pair of scroll members each comprising an end plate and a spiral wrap means projecting from one surface of the end plate. Both wrap means are interfitted to make a plurality of line contacts between them, and a driving mechanism including a drive shaft is connected to one of the scroll members to effect orbital motion thereof relative to the other (fixed) scroll member while rotation of the orbiting scroll is prevented. The center portions of the wrap means are made thicker than the remaining portions thereof, the center portions extending substantially from the inner ends of the wrap means outwardly at least throughout the portions thereof which contact one another when the two innermost fluid pockets are merged into a single fluid pocket to form the high pressure space near the center of the scroll members.

Abstract: A scroll type compressor is disclosed which 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 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 lower inner portion of the spiral wrap and a higher out portion thereof. The circular end plate of each scroll is provided with a stepped portion between a deeper outer portion of the end plate and a shallower inner portion thereof.

Abstract: A scroll type fluid displacement apparatus is disclosed, which includes a housing having a front end plate and a cup shaped casing. A fixed wrap extends into an operative interior area of the casing from an inner end surface of an end plate portion of cup shaped casing. An orbiting scroll has an end plate from which an orbiting wrap extends, and a tubular member axially projects from the end surface of end plate into the operative interior area of the casing. The tubular member has a hollow interior at its center. A drive shaft is rotatably supported by the front end plate and a crank pin extends from its inner end surface. The crank pin is rotatably carried within the hollow interior of the tubular member through a bearing to thereby rotatably support the orbiting scroll. A balance-weight is fixed on the axial end portion of the crank pin to cancel the dynamic unbalance caused by the centrifugal force of the orbital moving parts.

Abstract: A scroll type fluid displacement apparatus is disclosed having an adjustment mechanism for adjusting the axial clearance between the spiral elements and end plates of the fixed and orbiting scrolls. The apparatus includes a housing having a front end plate and a cup shaped casing attached thereto; the cup shaped casing has a fluid inlet port and a fluid outlet port. A fixed scroll, which includes a first end plate and a first spiral element, is fixedly disposed within the interior of the cup shaped casing. A large threaded opening is formed through an end plate of the cup shaped casing. An adjusting screw is screwed in the threaded opening to abut against the end surface of the fixed scroll. After adjusting the axial clearance between the fixed and orbiting scrolls by adjusting the position of the adjusting screw, a plurality of bolts fasten the fixed scroll to the cup shaped casing to prevent further axial movement.