Patent Number: 6,332,762

Title: Scroll-type fluid displacement apparatus

Abstract: A scroll-type fluid displacement apparatus includes an orbiting and fixed scroll members. The orbiting scroll member has a first end plate and a first spiral element extending from one side of the first end plate and the fixed scroll member has a second end plate and second spiral element extending from one side of the second end plate. A driving mechanism includes a drive shaft rotatably supported by the housing to effect the orbital motion of the orbiting scroll member by the rotation of the drive shaft to thereby change the volume of the fluid pockets. At least one of second side of the first end plate of the orbiting scroll member and the second end plate of the fixed scroll member has a recess portion having a plate thickness that is thinner than the rest of the respective end plate. As a result, the stress concentration of the orbiting scroll member and the fixed scroll member may be reduced, and the strength of the central part of end plates and spiral members may be increased. Therefore, the durability of the orbiting scroll member and the fixed scroll member of the fluid displacement apparatus may be increased.

Inventors: Tsukamoto; Ko (Isesaki, JP)

Assignee: Sanden Corporation

International Classification: F04C 18/02 (20060101); F01C 001/02 ()

Expiration Date: 12/25/2018