Patent ID: 6887051

Claim:
An air supply apparatus comprising a stator fixed to a motor frame, a rotor which is fixed to a motor shaft and rotated in said stator, an orbiting scroll which is operated by a mechanism shaft, a stationary scroll for forming a compression space between the stationary scroll itself and said orbiting scroll, and a rotation-restraint member for orbiting said orbiting scroll, in which said motor shaft and said mechanism shaft are connected to each other, said mechanism shaft passes through said orbiting scroll and said stationary scroll, said mechanism shaft is held by bearings at opposite ends of said orbiting scroll, wherein opposite ends of said motor shaft are rotatably held by a first bearing and a second bearing, opposite ends of said mechanism shaft are held by said second bearing and a third bearing, wherein said mechanism shaft and said motor shaft are integrally formed together, wherein said rotation-restraint member comprises at least one crankpin, and said at least one crankpin is provided at opposite ends with bearings, wherein an orbiting scroll lap having a predetermined height stands on one of surfaces of said orbiting scroll, a boss portion stands from a center portion of said one surface of said orbiting scroll, and a lap-reinforcing portion is formed between an outer peripheral surface of said boss portion and said orbiting scroll lap.