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AssigneeBorgWarner Inc.
InventorsUwe Knauer, Sieqfried Ritter, Robert Lingenauber
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A turbocharger with an improved suspension mechanism for the actuation ring of a variable nozzle mechanism, for improved maintenance of the geometry of the suspension mechanism in the case of extreme temperature oscillations. The suspension mechanism includes a number of guide rollers (149) provided between housing part (126) and nozzle ring (138) with circumferential grooves (159) in which the inner circumference of the actuating ring rides. The rollers are formed as one piece together with axial extensions (149′, 149″, 149a, 149b), which extensions are rotatably seated in appropriate bores in the nozzle ring (138) and/or in the housing part (126). The axial extensions can have diameters which are smaller than or the same as the diameter of the actual roller part.
A turbocharger in which gas is directed through a first annular passage (30) to the turbine, including a housing (18, 24, 26, 126), a ring of guide blades (34) in the first annular passage (30), which are mounted pivotably on a nozzle ring (138) defining one boundary of the first annular passage, and an annular actuating ring (48, 148) coupled to pivot the blades by movement of the actuating ring in relation to the nozzle ring, and a suspension mechanism (55) for the actuating ring (48, 148) which brings about a coaxial location of the nozzle ring and the actuating ring relative to each other and about the turbine shaft, wherein rollers (49, 149) are provided about the inner our outer circumference of the actuating ring, which rollers are provided in a second annular passage (70, 170) formed between a housing part (126) and the nozzle ring (38, 138), thereby characterized, that each of the rollers (149) includes at least one axial extension, which is rotatably seated in a bore in either the nozzle ring (38, 138) or the housing part (126) or both.
A turbocharger according to one of the preceding claims, thereby characterized, that the axial extensions (149′, 149″) are tapered or rounded at their free ends in order to facilitate insertion into the bores.
A turbocharger according to one of the preceding claims, thereby characterized, that the axial extensions (149″) exhibit smaller diameter than the rollers (149).
A turbocharger according to one of the preceding claims, thereby characterized, that the axial extensions (149a, 149b) exhibit the same diameter as the rollers (149).
A turbocharger according to one of the preceding claims, thereby characterized, that the rollers (49, 149, 149′, 149″, 149c) include grooves (59, 159) adapted for guiding the internal circumference of the actuating ring (48, 148).
A turbocharger according to one of the preceding claims, thereby characterized, that the rollers (149d) exhibit a smooth cylindrical surface (159a) free of grooves, and that the thickness of the actuating ring (148a) is only slightly less than the breadth of the second annular passage.
Dependencies are inferred from the claim text.