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US4867637A Expired / Lapsed US ⏱️ 0.0 years remaining

Variable area nozzle turbine

Assignee: Honda Motor Co Ltd
•
Filing: 1989-02-13
•
Granted: 1989-09-19
•
Expires: 2009-02-13
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Abstract

Abstract A radial turbine of a variable area nozzle type which is suitable for use as the exhaust turbine of a turbocharger for an automotive internal combustion engine requiring a quick response and a wide operating range. This turbine comprises at least two groups of variable area nozzles which may be, for instance, defined by moveable vanes, and can be individually controlled for each group to vary their sizes. By opening the variable area nozzles of the first group while the variable area nozzles of the second group are kept closed, a sufficient supercharging effect can be obtained even when the fluid flow rate is small. By opening the variable area nozzles of both the groups, the resistance to the fluid flow can be reduced and the creation of excessive back pressure at the inlet to the turbine can be avoided even when the fluid flow rate is large. In this way, not only the operating range of the turbine can be expanded but also the control accuracy particularly in small nozzle opening condition can be improved.

Inventors

  • 👤 Masato Hayama

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 09:24
CPC Classifications
F; F01; F01D; F01D17/00; F01D17/10; F01D17/12; F01D17/14; F01D17/16; F01D17/165

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 80 words
A variable area nozzle turbine, comprising: a casing defining a scroll passage and an axial passage communicated with a central part of said scroll passage; a turbine wheel rotatably arranged in said central part of said scroll passage; and a plurality of angularly spaced variable area nozzles arranged around the outer periphery of said turbine wheel; wherein: said variable area nozzles comprise at least two groups of variable area nozzles which groups can be individually controlled to vary their sizes.
Claim 2
Dependent Claim 80 words
A variable area nozzle turbine, comprising: a casing defining a scroll passage and an axial passage communicated with a central part of said scroll passage; a turbine wheel rotatably arranged in said central part of said scroll passage; and a plurality of angularly spaced variable area nozzles arranged around the outer periphery of said turbine wheel; wherein: said variable area nozzles comprise at least two groups of variable area nozzles which groups can be individually controlled to vary their sizes.
Claim 3
Dependent Claim 92 words
A variable area nozzle turbine as defined in claim 1, further comprising control means for opening said variable area nozzles of said first group to a desired extent, and keeping said variable nozzles of said second group closed when the flow rate of working fluid is less than a prescribed value; and for keeping said variable area nozzles of said first group fully open, and opening said variable area nozzles of said second group to a desired extent when the flow rate of said working fluid is greater than said prescribed value.
Claim 4
Dependent Claim 29 words
A variable area nozzle turbine as defined in claim 2, wherein said variable area nozzles of said different groups are arranged in an alternating fashion around said turbine wheel.
Claim 5
Dependent Claim 55 words
A variable area nozzle turbine as defined in claim 2, wherein each of said variable area nozzles is defined by a moveable vane which is p ivoted at its leading edge by an axiasl pin and defines a variable size of the nozzle with its trailing edge and the leading edge of an adjacent vane.
Claim 6
Dependent Claim 18 words
A variable area nozzle turbine as defined in claim 4, wherein said adjacent vane is another moveable vane.
Claim 7
Dependent Claim 18 words
A variable area nozzle turbine as defined in claim 4, wherein said adjacent vane is a fixed vane.
Claim 8
Dependent Claim 29 words
A variable area nozzle turbine as defined in any of the preceding claims, which is used as the exhaust turbine of a turbocharger for an automotive internal combustion engine.

References Cited (Backward Citations)

CH129731A Cited
US2648195A Cited
US2860827A Cited
US3101926A Cited
SU715812A1 Cited
US4678397A Cited
US4702672A Cited
US4776757A Cited
US4780054A Cited
US4799856A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-09-18 1993-03-20 1993-09-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-09-18 1997-03-20 1997-09-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-09-18 2001-03-20 2001-09-19 $7700.00 Window Closed / Lapsed

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