11-04-2013 дата публикации
Номер: US20130089411A1
The propensity for gas leakage around a shaft, which connects volumes of differing pressures, in, e.g., a turbocharger is minimized in a simple cost-effective manner. The addition of a complementary pair of frusto-spherical, conical, or other profiles to the interface of the shaft and its bearing maintain concentricity of the shaft in its bore and thus improve the efficacy of existing sealing protocols. 1. A turbocharger with:a turbocharger housing,{'b': 35', '22', '29', '35, 'an actuating mechanism () for actuating a device () within the turbocharger, and a pivot shaft () having an inside end inside the turbine housing and an outside end outside the turbine housing, and rotatably mounted in a bore in the turbocharger housing for transmitting an actuating movement from outside the turbocharger housing to the actuating mechanism (),'}{'b': '39', 'wherein the shaft or bore is provided with a seal (), and'}wherein the shaft and bore are provided with complementary, concentric, self-centering mating contact surfaces for (a) centering and preventing tilt of the seal and (b) further sealing against leakage.247494648. The turbocharger according to claim 1 , wherein a segment of the shaft passing through the bore narrows in diameter ( claim 1 , ) and a segment of the bore narrows in diameter ( claim 1 , ) complementary to the narrowing diameter of the shaft.3. The turbocharger according to claim 2 , wherein the shape of the narrowing convexity and concavity are frusto-conical claim 2 , frusto-spherical claim 2 , part conical claim 2 , part spherical claim 2 , mixtures of flat and conical or flat and spherical (“stepped”) claim 2 , combinations of differently angled conical surfaces claim 2 , or combinations of different curvature surfaces.4. The turbocharger according to claim 3 , wherein the shaft and bore exhibit 360° concentricity at the mating contact surfaces.5. The turbocharger according to claim 1 , wherein the sealing portion comprises a circumferential groove ...
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