Patent ID: 7832270

Claim:
Apparatus for measuring rotational imbalance of a turbocharger core assembly, comprising a base frame, support means for mounting a rotational core assembly thereon, air supply means for rotationally driving a turbine of the core assembly, and a device to measure transverse oscillatory vibration of the core assembly during rotation; characterised in that the support means comprises a rigid annular housing mounted between spaced resilient means attached to the base frame such as to afford a degree of movement of the rigid annular housing in a plane transverse to the rotational axis of the core assembly; and in that the rigid annular housing includes a volute through which air is fed to drive the core assembly, wherein the rigid annular housing of the support means comprises two axial parts, the first part being attached by the resilient means to the base frame and having a driving air inlet passage communicating with an internal annular chamber; the second part being an adaptor removably attached to the first part and containing said volute which when the two parts are attached together extends into the annular chamber of the first part to receive driving air from said air inlet.