In a manufacturing method and tool of scroll member used in scroll type fluid displacement apparatus, in order to reduce waste metal, used energy and time in machining operation subsequent to a molding operation, a molding member which has a first involute groove and a second involute groove at its side surface and an insertion member which should be disposed in the first involute groove are used in the molding operation. The sectional configuration of the first involute groove is formed in wedge-shape and, sectional configuration of the second involute groove is formed substantially in rectangular-shape. The insertion member has a wedge-shape cross section. A metal of which the spiral element of preformed scroll member is made is fullfilled in the second involute groove for metal forming. After metal forming, the insertion member is removed from the first involute groove and the formed metal member is taken out from the second involute groove. The preformed scroll member with rectangular cross section is thereby obtained.

Another molding member which has a circular indentation at its axial end surface is used. This molding member is disposed on the end surface of first molding member for covering the both involute grooves. The space of indentation consists of the forming space. Therefore, metal filling up the forming space of indentation forms the end plate of preformed scroll member.

The first molding member has a plurality of holes each of which is placed on the locus of involute curve and connects between the bottom surface of first involute groove and opposite side surface of first molding member. The insertion member has a plurality of pins at the axial end surface thereof. When the insertion member is disposed in the first involute groove, each of the pins is inserted in the each hole of the molding member and the axial outer end portion of pin extends from the hole. The insertion member is, therefore, easily removed from the first involute groove by pushing up the pins.

A scroll-type compressor whose capacity can be easily changed and with which an inconvenience can be prevented is provided. A scroll-type compressor includes a fixed scroll having a first spiral-shaped wall member provided upright on a side surface of a first end plate, and an orbiting scroll (7) having a second spiral-shaped wall member (7b) provided upright on a side surface of the second end plate (7a), the orbiting scroll being supported so as to be capable of orbital revolution movement while being prevented from self rotation by meshing the wall members (7b) with each other. Wall-member stepped portions (33) having a small height at the center and a large height at the outer side in a direction along the spiral are formed on the upper edges of the first and second wall members (7b). End-plate height-difference portions (29) having a large height at the center and a small height at the outer side in the direction along the spiral are formed on the side surfaces of the first and second end plates (7a), at positions facing the wall-member stepped portions. One of the first and second wall members (7b) has a cutout portion (7h) formed at the outer end in the direction along the spiral and has a smaller spiral-end angle than the other of the first and second wall members.

Der Läufer (1) für eine Verdrängermaschine für kompressible Medien weist ein zylindrisches Scheibenteil (2) auf, an dem spiralförmig verlaufende, senkrecht von dem Scheibenteil abstehende leistenartige Verdrängerkörper (5) angebracht sind. Um eine einfache Herstellung und eine günstige, den jeweiligen Anforderungen optimal angepaßte Werkstoffwahl zu ermöglichen, sollen die leistenartigen Verdrängerkörper aus spiralförmig gewickelten Blechbändem bestehen, die in durchgehenden spiralförmigen Schlitzen (4) des - vorzugsweise als Feinstanzteil ausgebildeten Scheibenteils (2) gehalten sein. Zusätzlich können die Blechbänder (5) durch eine Verklebung oder Verlötung in den Schlitzen (4) gesichert sein.

A scroll type fluid displacement apparatus is desclosed. The scroll members are made of aluminum or aluminum alley to reduce the weight of the apparatus. The scroll members are finished by end mill and applied a electrolytic or chemical polishing to improve the roughness of mating surface. At least one scroll is treated by alumite after polishing to reduce the wearing due to contact between both scroll members. Therefore the sealing of fluid pockets between both scroll members can be maintained during along use of the apparatus.

A scroll type fluid displacement apparatus having a pair of scroll members (28, 30) each comprising an end plate (281, 301) and a spiral wrap (282, 302) extending from one side of the end plate. The spiral wraps 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. At least one of the scroll members (28) is provided with an anti-wear plate (40) at its end surface facing the other scroll member. The anti-wear plate is an insolute plate that covers those areas of the end surface of the end plate where the spiral wrap of the other scroll member makes contact during the orbital motion of the orbiting scroll member. An elastic plate can also be used between the anti-wear plate and the end surface of the end plate to give axial preload to the end surface of the spiral wrap of the other scroll member. The anti-wear plate prevents excessive wear while ensuring axial sealing. Therefore, the axial sealing of the fluid pockets is secured and wear of the scroll member is minimized.

A two-piece scroll member, for use in scroll apparatus, is fabricated by seating a separately formed involute wrap in an involute channel cut in the end plate. The channel has at least one reentrant groove and the surface of the wrap is configured to engage the groove. Locking means are coined into the groove to rigidly affix the wrap to the end plate.