EP0227475A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Variable displacement turbocharger
Assignee: IHI Corp
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Filing: 1986-12-23
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Granted: —
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Expires: 2006-12-23
Abstract
Abstract A variable displacement turbocharger comprises a turbine casing (1), a shroud (3) coaxially within the casing and a gas outlet cover (2) connected to the casing. The casing (1), the shroud (3) and the gas outlet cover (2) together define a closed annular space (8). The casing (1) and the shroud (3) together define a space which accommodates a turbine wheel (11) and which communicates with a gas inlet passage within the casing (1) through an annular passage in which a plurality of nozzle blades (6) are situated. Each nozzle blade (6) is rotatably carried by a nozzle shaft (4) and the nozzle shafts (4) are connected by respective links (27) to a common nozzle driving ring (9) within the annular space (8). The driving ring (9) is connected to actuating means (21,24) outside the space (8), movement of which results in rotation of the driving ring (9) and thus of the nozzle blades (6) to adjust the flow rate of exhaust gases to the turbine wheel. The driving ring (9) is axially retained by the accommodation of its periphery in a space defined between the casing (1) and the gas outlet cover (2).
Inventors
- 👤 Masami Shimizu
- 👤 Kinshi Takagi
- 👤 Nobuhiro Kondo
- 👤 Hiromu Furukawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 16:31
CPC Classifications
F; F02; F02B; F02B37/00; F02B37/12; F02B37/24; F01; F01D; F01D17/00; F01D17/10; F01D17/12; F01D17/14; F01D17/16; F01D17/165; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
181 words
A variable displacement turbocharger comprising a turbine casing (1), a shroud (3) within the casing and a gas outlet cover (2) connected to the casing, the casing (1), the shroud (3) and the gas outlet cover (2) together defining a closed annular space (8) and the casing (1) and the shroud (3) together defining a space which accommodates a turbine wheel (11) and which communicates with the gas inlet passage within the casing (1) through an annular passage in which a plurality of nozzle blades (6) are situated, each nozzle blade (6) being rotatably carried by a nozzle shaft (4) and the nozzle shafts (4) being connected by respective links (27) to a nozzle driving ring (9) within the annular space (8), the driving ring (9) being connected to actuating means (21,24) outside the space (8), movement of which results in rotation of the driving ring (9) and thus of the nozzle blades (6), characterised in that the periphery of the driving ring (9) is slidably received in a space defined between the casing (1) and the gas outlet cover (2).
Claim 2
Dependent Claim
181 words
A variable displacement turbocharger comprising a turbine casing (1), a shroud (3) within the casing and a gas outlet cover (2) connected to the casing, the casing (1), the shroud (3) and the gas outlet cover (2) together defining a closed annular space (8) and the casing (1) and the shroud (3) together defining a space which accommodates a turbine wheel (11) and which communicates with the gas inlet passage within the casing (1) through an annular passage in which a plurality of nozzle blades (6) are situated, each nozzle blade (6) being rotatably carried by a nozzle shaft (4) and the nozzle shafts (4) being connected by respective links (27) to a nozzle driving ring (9) within the annular space (8), the driving ring (9) being connected to actuating means (21,24) outside the space (8), movement of which results in rotation of the driving ring (9) and thus of the nozzle blades (6), characterised in that the periphery of the driving ring (9) is slidably received in a space defined between the casing (1) and the gas outlet cover (2).
Claim 3
Dependent Claim
30 words
A turbocharger as claimed in claim 1 characterised in that the nozzle driving ring (9) is rotatably supported by one or more projections (15) on the gas outlet cover (2).
Claim 4
Dependent Claim
21 words
A turbocharger as claimed in claim 2 characterised in that the projections (15) are integral with the gas outlet cover (2).
Claim 5
Dependent Claim
37 words
A turbocharger as claimed in claim 2 characterised by a plurality of projections, each of which comprises a centering fixture (15) removably connected to the gas outlet cover (2) by means of a countersunk head screw (17).
Claim 6
Dependent Claim
47 words
A turbocharger as claimed in claim 2 or claim 3 characterised in that at least one of the projections (15") is positioned to be engaged by the nozzle driving ring (9) or a member (22) connected thereto when the nozzle blades (6) have reached a predetermined position.
Claim 7
Dependent Claim
46 words
A turbocharger as claimed in any one of claims 2 to 5 characterised in that at least the end portions of the sliding contact surface of the or each projection (15) is less than that of the inner peripheral surface of the nozzle driving ring (9).
Claim 8
Dependent Claim
56 words
A turbocharger as claimed in any one of claims 2 to 6 characterised by a plurality of projections (15) of which those which, in use, are subjected to a greater proportion of the load transmitted through the nozzle driving ring (9) have a larger surface contacting the nozzle driving ring (9) than the remaining projections (15′).
Claim 9
Dependent Claim
36 words
A turbocharger as claimed in any one of the preceding claims characterised by one or more protuberances (28) on the shroud positioned to be engaged by the nozzle blades (6) when they reach a predetermined position.
Claim 10
Dependent Claim
43 words
A turbocharger as claimed in any one of the preceding claims characterised in that the nozzle shafts (4) have a uniform diameter over their length and are supported in bearings (5) having an end face which directly contacts the associated nozzle blade (6).
Claim 11
Dependent Claim
33 words
A turbocharger as claimed in any one of the preceding claims characterised in that the side surface of the nozzle blades (6) adjacent the shroud (3) is inclined away from the shroud (3).
Claim 12
Dependent Claim
36 words
A turbocharger as claimed in any one of the preceding claims characterised by a gas connection (29) communicating with the annular space (8) through which, in use, compressed air is introduced into the annular space (8)
Claim 13
Dependent Claim
27 words
A turbocharger as claimed in any one of claims 1 to 10 characterised in that the annular space (8) and the gas outlet (12) are in communication.
References Cited (Backward Citations)
No citation records indexed.
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