A turbocharger (10) includes a shaft (26) rotatably supported within a bearing housing (28), a turbine wheel (22) connected to the shaft (26), and a heat shield (150, 250) disposed between the turbine wheel (22) and the bearing housing (28). The heat shield (150, 250) includes surface features (80,
A turbocharger (10) includes a shaft (26) rotatably supported within a bearing housing (28), a turbine wheel (22) connected to the shaft (26), and a heat shield (150, 250) disposed between the turbine wheel (22) and the bearing housing (28). The heat shield (150, 250) includes surface features (80, 180) formed on at least one of a sidewall (57) portion thereof and a flange (63) portion thereof that locate the heat shield (150, 250) relative to the bearing housing (28) such that the heat shield (150, 250) is coaxial with the rotational axis of the shaft (26).
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1. A turbocharger (10) comprising a bearing housing (28),a shaft (26) rotatably supported within the bearing housing (28),a turbine housing (14) connected to the bearing housing (28),a turbine wheel (22) disposed in the turbine housing (14) and connected to the shaft (26), anda heat shield (150) inc
1. A turbocharger (10) comprising a bearing housing (28),a shaft (26) rotatably supported within the bearing housing (28),a turbine housing (14) connected to the bearing housing (28),a turbine wheel (22) disposed in the turbine housing (14) and connected to the shaft (26), anda heat shield (150) including a radially extending base (51) having a central opening (52) that receives the shaft (26),a radially extending flange (63) that is axially offset from the radially extending base (51), anda sidewall (57) extending between the base (51) and the flange (63), the sidewall (57) having a first end (58) connected to a radially-outermost end of the base (51), anda second end (59) that is opposed to the first end (58) and connected to a radially-innermost end (65) of the flange (63),wherein the heat shield (150) includes surface features (80) formed on the flange (63) that locate the heat shield (150) relative to the bearing housing (28), the surface features (80) comprising an axially protruding ridge (82) that is formed in the flange (63), the ridge (82) being received within a circumferential groove (23) formed in the bearing housing (28) whereby the heat shield (150) is located relative to the bearing housing (28) such that the heat shield (150, 250) is co-axial with the rotational axis of the shaft (26). 2. The turbocharger (10) of claim 1, wherein the axially protruding ridge (82) is convex on a bearing housing-facing surface (66) of the flange (63), and concave on a turbine housing-facing surface (67) of the flange (63). 3. The turbocharger (10) of claim 1, wherein the ridge (82) is continuous in a circumferential direction. 4. The turbocharger (10) of claim 1, wherein the ridge (82) is formed at a location of the flange (63) that adjoins the sidewall (57). 5. The turbocharger (10) of claim 1, wherein the bearing housing (28) includes a nose (29) on the turbine housing-facing surface (28a) of the bearing housing (28), axially protruding towards the turbine housing (14) and centered on a shaft-receiving bore (30), and wherein a radial clearance is provided between the central opening (52) of the heat shield (150) and the bearing housing nose (29). 6. A turbocharger (10) comprising a bearing housing (28),a shaft (26) rotatably supported within the bearing housing (28),a turbine housing (14) connected to the bearing housing (28),a turbine wheel (22) disposed in the turbine housing (14) and connected to the shaft (26), anda heat shield (250) including a radially extending base (51) having a central opening (52) that receives the shaft (26),a radially extending flange (63) that is axially offset from the radially extending base (51), anda sidewall (57) extending between the base (51) and the flange (63), the sidewall (57) having a first end (58) connected to a radially-outermost end of the base (51), anda second end (59) that is opposed to the first end (58) and connected to a radially-innermost end (65) of the flange (63),wherein the heat shield (250) includes surface features (180) formed on the sidewall (57) that locate the heat shield (250) relative to the bearing housing (28), the surface features (180) including radially inward-extending protrusions (182,282) that are spaced along a circumference of the sidewall (57), a radially inward-facing surface (60a) of the protrusions (182,282) abutting a radially outward-facing surface (28b) of the bearing housing (28), whereby the heat shield (250) is located relative to the bearing housing (28) such that the heat shield (150, 250) is co-axial with the rotational axis of the shaft (26). 7. The turbocharger (10) of claim 6, wherein a ratio (Ls/Lp) of a circumferential dimension (Ls) of the sidewall (57) to a circumferential dimension (Lp) of the protrusion (182) is in a range of 20 to 100. 8. The turbocharger (10) of claim 6, wherein the heat shield (250) includes three protrusions (182,282). 9. The turbocharger (10) of claim 6, wherein a dimension (Lp) of the protrusion (182,282) in a circumferential direction is less than 10% of a circumferential dimension (Ls) of the sidewall (57) without protrusion. 10. The turbocharger (10) of claim 6, wherein the bearing housing (28) includes a nose (29) on the turbine housing-facing surface (28a) of the bearing housing (28), axially protruding towards the turbine housing (14) and centered on a shaft-receiving bore (30), and wherein a radial clearance is provided between the central opening (52) of the heat shield (250) and the bearing housing nose (29).
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이 특허에 인용된 특허 (2)
Delitz, Joachim, Connection assembly for joining a turbine housing and a bearing housing and exhaust gas turbocharger.
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