Abstract: A scroll fluid machine has a stationary scroll member and an orbiting scroll member each having an end plate and a spiral wrap. At least one oil injection port and at least one oil relieving passage is formed in the end plate of either one of the scroll members. The oil injection port opens into at least one of the enclosed spaces, while the oil relieving passage provides an intermittent communication between that enclosed space and a space or chamber of an intermediate pressure formed by the scroll members which includes a suction chamber.

Abstract: A scroll fluid apparatus including a fixed scroll member and an orbiting scroll member each having an end plate and a wrap, the two scroll members being maintained in meshing engagement with each other with the respective wraps facing inwardly to allow the orbiting scroll member to move in orbiting movement with respect to the fixed scroll member without rotating on its own axis. The fixed scroll member is formed with a discharge port at its central portion and a suction port at its outer peripheral surface to draw a gas by suction through the suction port and allow same to flow in a sealed space defined between the two scroll members and reducing its space during operation to thereby compress the gas and discharge the compressed gas through the discharge port.

Abstract: A scroll-type fluid machine having a stationary scroll member and an orbiting scroll member each of which includes a disc-like end plate and a spiral wrap extending axially from one side of the end plate, with the wraps of the scroll members meshing with each other to define therebetween closed compression chambers. The orbiting scroll member is disposed between the end plate of the stationary scroll member and a frame of the machine with a back clearance between the other side of the end plate of the orbiting scroll member side thereof and the opposing surface of the frame. The orbiting scroll member is driven to make an orbiting movement with respect to the stationary scroll member so that the compression chambers are progressively moved towards the center of the scroll members while decreasing their volumes, to thereby suck a fluid through a suction port in the stationary scroll member and compress the same to discharge the compressed fluid through a discharge port formed in the stationary scroll member.

Abstract: A scroll-type fluid machine having an orbiting scroll member and a stationary scroll member each having an end plate and a spiral wrap of at least two turns protruding upright from one of the sides of the end plates. The orbiting scroll member has a back pressure chamber formed on the back side thereof and communicating with the compression spaces of the fluid machine through pressure equalizing ports formed in the orbiting scroll member, so that the pressure of the fluid under compression is introduced to the back pressure chamber to produce an axial thrusting force for pressing the orbiting scroll member towards the stationary scroll member. The positions of the pressure equalizing ports in terms of the wrap angle .lambda. of the wraps are selected to meet the following condition:.lambda.d>.lambda.>.lambda.d-2.pi.,where, .lambda.d represents the wrap angle of the wraps when the volume of the compression spaces is minimized. The equalizing ports are positioned at .lambda. and .lambda.+2 .pi..

Abstract: An oil feeding device for a scroll fluid apparatus including an oil flow passage in the crankshaft providing oil to the crank pin bearing, an intermediate pressure chamber, and the sealed spaces between the scroll members.

Abstract: A scroll fluid apparatus including a stationary scroll member having an end plate of a disc shape and a spiral wrap disposed in upright position on the end plate and formed with a suction chamber defined by an arcuate wall of an outer peripheral portion of the wrap, and an orbiting scroll member having an end plate of a disc shape and a spiral wrap disposed in upright position on the end plate. The stationary scroll member and the orbiting scroll member mesh with each other to allow the orbiting scroll member to move in orbiting movement with respect to the stationary scroll member. The stationary member is formed with an exhaust port opening and a suction port so that gas is drawn by suction through the suction port and compressed in compression spaces defined by the two scroll members to thereby be discharged as compressed gas through the exhaust port.

Abstract: A scroll fluid apparatus for handling a compressible fluid and including stationary and orbiting scroll members. The stationary scroll member has a high-pressure central port located in the vicinity of the center thereof and having a profile which is defined by a boundary line located in a region defined by first and second circles both being centered at a point located on a straight line extending through the positions in which the inner ends of wraps are contact with the inner side walls of the opposing wraps, respectively, in the reference condition. The first circle has a diameter equal to the distance between the above-mentioned positions and the second circle has a diameter such that it is in contact with the inner side walls of the wraps.

Abstract: An oil feeding device for plain bearings supporting a crankshaft connected to an orbital scroll member in a scroll fluid apparatus, including axially extending oil flow passages formed on the outer peripheral surface of the crankshaft at portions journaled by the plain bearings but displaced from the lines of action of lateral loads caused by fluid pressure in the sealed space between two scroll members, thereby generating bearing oil film reactions commensurate with the lateral loads, so as to produce an optimum oil film pressure distribution for the bearings at all times.

Abstract: A scroll fluid apparatus including two scroll members, with one scroll member having a wrap and an annular portion located outside the wrap and having a height corresponding to the height of the wrap. The annular portion is contiguous at its surface in the form of a land with the surface of the wrap for a circumferential extent of within 180 degrees from the terminating end of the wrap, and a strip-shaped recess is formed in the land, with the strip-shaped form having an end portion maintained in communication with a low pressure zone surrounded by the annular portion of the scroll member.

Abstract: A scroll member assembly of a scroll-type fluid machine, having a stationary scroll member and an orbiting scroll member each including an end plate and a wrap protruding upright from the end plate. The scrolling members are assembled together with the wraps fitting each other, in such a manner that the orbiting scroll member makes an oribitary motion relatively to the stationary scrolling member but does not rotate around its own axis. The wrap of the stationary scroll member has a scrolling angle which is greater than that of the wrap of orbiting scroll member by an angle not greater than 180.degree..

Abstract: A scroll fluid apparatus in which a bearing of a plurality of bearings journaling a crankshaft which is closest to an orbiting scroll is located in a plane extending through the point of application of force transmitted between the orbiting scroll member and the crankshaft and disposed at a right angle to the center axis of the crankshaft, to minimize the moment of load applied to the bearings.

Abstract: A scroll-type fluid apparatus including an orbiting scroll member, a stationary scroll member, and a plurality of pockets formed in at least one of the orbiting scroll member and the stationary scroll member to cooperate with the other scroll member for confining liquid therein. When an axially urging force is ecerted on the orbiting scroll member, a liquid pressure commensurate with the axially urging force is produced in the pockets, so that such liquid pressure cancels out a biased axially urging force (moment) exerted on the orbiting scroll member.

Abstract: A scroll compressor for compressing a gas to a high pressure or for use in a refrigeration system such as a refrigerator, freezer, air conditioner or the like, is provided. In the compressor, a compressor unit and its driving motor is enclosed gas-tightly in a casing, and the compressor unit is provided with a backpressure chamber into which is introduced a partially compressed gas so as to press an orbiting scroll member against a stationary scroll member. The compressed gas discharged from the compressor unit is circulated through component parts such as the motor enclosed in the casing before it flows into a next stage outside of the compressor. With the above arrangement, the separation of the orbiting scroll member from the stationary scroll member due to the gas pressure is prevented to thereby attaining a secure axial seal between them, and also the motor is satisfactorily cooled.

Abstract: A scroll-type fluid machine is provided with a plurality of liquid-confining pockets formed in the sliding surface of the end member of either one of orbiting and stationary scrolls. In operation, a high liquid pressure is generated in the pocket or pockets positioned in the region where a localized high axial urging force is exerted during operation, so that the localized high axial urging force acting on the two scrolls is partially or fully negated.